v0.1.10-alpha

screen size auto negotiation
audi 32 to 64 bit fix
2026-11-10 16:02:25 +01:00 · 2026-10-01 20:48:10 -07:00 · 2026-10-01 20:43:26 -07:00 · 2026-10-01 20:37:04 -07:00 · 2026-10-01 20:34:35 -07:00 · 2026-10-01 20:17:44 -07:00
162 changed files with 24353 additions and 6 deletions
@@ -0,0 +1,59 @@
 name: Bug report
 description: Something in Gearslip broke or behaves wrong.
 labels: ["bug"]
 body:
  - type: markdown
    attributes:
      value: |
        Thanks for reporting. Check the [open issues](https://github.com/Seb3thehacker/gearslip/issues) first, in case someone has already reported it.
  - type: input
    id: car
    attributes:
      label: Car
      description: Make, model, and year.
      placeholder: 2019 Honda Civic
    validations:
      required: true
  - type: dropdown
    id: head-unit
    attributes:
      label: Head unit
      options:
        - The one the car came with
        - A factory unit from another car
        - An aftermarket unit (Pioneer, Kenwood, Alpine, and so on)
        - A homemade or open-source unit, such as LIVI
        - I don't know
    validations:
      required: true
  - type: dropdown
    id: connection
    attributes:
      label: Connection
      options:
        - USB cable
        - Wireless dongle
    validations:
      required: true
  - type: textarea
    id: what-happened
    attributes:
      label: What happened
      description: What you did, what you expected, and what happened instead.
    validations:
      required: true
  - type: textarea
    id: log
    attributes:
      label: Log
      description: |
        On the phone, open Logs from Gearslip's home screen and tap Share log. Drag the file here.
        The log records your phone, its Android version, the Gearslip version, and why the connection ended.
      placeholder: Drop the log file here.
    validations:
      required: true
@@ -0,0 +1,65 @@
 name: Car report
 description: Tell us whether Gearslip works in your car, so others know before they install.
 labels: ["car report"]
 body:
  - type: markdown
    attributes:
      value: |
        Reports from working cars help as much as reports from broken ones.
  - type: input
    id: car
    attributes:
      label: Car
      description: Make, model, and year.
      placeholder: 2019 Honda Civic
    validations:
      required: true
  - type: dropdown
    id: head-unit
    attributes:
      label: Head unit
      options:
        - The one the car came with
        - A factory unit from another car
        - An aftermarket unit (Pioneer, Kenwood, Alpine, and so on)
        - A homemade or open-source unit, such as LIVI
        - I don't know
    validations:
      required: true
  - type: dropdown
    id: connection
    attributes:
      label: Connection
      options:
        - USB cable
        - Wireless dongle
    validations:
      required: true
  - type: dropdown
    id: result
    attributes:
      label: Does it work?
      options:
        - Yes, everything I tried works
        - Partly. It connects, but something is wrong
        - No, it never connects
    validations:
      required: true
  - type: textarea
    id: notes
    attributes:
      label: Notes
      description: What you tried, and anything that didn't work.
  - type: textarea
    id: log
    attributes:
      label: Log
      description: |
        Needed if the car doesn't work. On the phone, open Logs from Gearslip's home screen and tap Share log. Drag the file here.
      placeholder: Drop the log file here.
@@ -0,0 +1 @@
 blank_issues_enabled: false
@@ -0,0 +1,23 @@
 name: Feature request
 description: Suggest something Gearslip should do.
 labels: ["enhancement"]
 body:
  - type: textarea
    id: problem
    attributes:
      label: What do you want to do?
      description: Describe the problem, not the solution. "I can't see my next turn while music plays" helps more than "add a turn widget."
    validations:
      required: true
  - type: textarea
    id: idea
    attributes:
      label: How should it work?
      description: Your idea for a fix, if you have one.
  - type: textarea
    id: apps
    attributes:
      label: Apps involved
      description: Any apps this touches, such as a map or music app.
@@ -0,0 +1,48 @@
 name: Release
 on:
  push:
    tags:
      - "v*"
 jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: "21"
      - uses: gradle/actions/setup-gradle@v4
      - name: Write signing key and properties
        run: |
          echo "${{ secrets.KEYSTORE_BASE64 }}" | base64 -d > gearslip-release.jks
          cat > keystore.properties <<EOF
          storeFile=gearslip-release.jks
          storePassword=${{ secrets.KEYSTORE_STORE_PASSWORD }}
          keyAlias=${{ secrets.KEYSTORE_KEY_ALIAS }}
          keyPassword=${{ secrets.KEYSTORE_KEY_PASSWORD }}
          EOF
      - name: Build release APK
        run: ./gradlew :gearslip:assembleRelease
      - name: Locate APK
        id: apk
        run: |
          # The build moves its APKs to <root>/build/Gearslip-<variant>.apk (see renameApk).
          apk=build/Gearslip-release.apk
          test -f "$apk" || { echo "no APK at $apk"; ls -R build | head -50; exit 1; }
          echo "path=$apk" >> "$GITHUB_OUTPUT"
      - name: Create release
        uses: softprops/action-gh-release@v2
        with:
          files: ${{ steps.apk.outputs.path }}
          generate_release_notes: true
@@ -0,0 +1,32 @@
 *.iml
 .gradle/
 .idea/
 .DS_Store
 .kotlin
 /build
 local.properties
 # Keys
 *.jks
 *.keystore
 keystore.properties
 # Native build cache.
 .cxx/
 # Testing
 /docs/cert-sweep.sh
 extraction/
 /cloned-repos
 # Internal
 *.pdf
 todo
 logs/
 # For AI code
 .claude/
 CLAUDE.md
 # Other
 archive/
@@ -0,0 +1,51 @@
 # Contributing to Gearslip
 Thanks for helping. Bug reports from real cars are the most useful thing you can send, so
 start there if you aren't sure where to begin.
 ## Reporting a bug
 Open an issue on [GitHub](https://github.com/Seb3thehacker/gearslip/issues) and include:
 - your car's make, model, and year, and whether the head unit is the original one; and
 - the log from the drive. Open Logs on the phone app's home screen and tap Share log.
 The log records your phone, its Android version, the Gearslip version, the head unit, and
 why the connection ended. Most car bugs can't be fixed without it. Head units often report
 only a part number, so the log can't name your car for you.
 ## Building
 You need Android Studio, or the Android SDK with JDK 21. Gradle downloads the NDK, CMake,
 and the speech library on the first build.
 ```
 ./gradlew :gearslip:assembleDebug
 ```
 The APK lands at `build/Gearslip-debug.apk`. It installs as Gearslip Dev, next to the
 regular app.
 ## Pull requests
 Work happens on the `experimental` branch, which merges into `main` at each release. Base your
 branch on `experimental`, and open your pull request against it.
 - Keep each pull request to one change, and explain the problem it solves.
 - Say how you tested it: which car or head unit, which phone, and which apps.
 - Code written with AI tools is welcome. Read it, test it, and stand behind it as you would
  your own.
 - Gearslip asks for no adb, root, or Shizuku. A feature must work with ordinary Android
  permissions and on-device consent dialogs.
 ## Writing
 Text that users read, such as screens, release notes, and docs, follows Strunk's
 [*The Elements of Style*](https://www.gutenberg.org/ebooks/37134). In short: use the active
 voice, state things positively, cut needless words, and use the serial comma.
 ## License
 Gearslip is licensed under AGPL-3.0, and your contributions are too. The author also sells a
 commercial license, described in [NOTICE.md](NOTICE.md). By opening a pull request, you
 agree that your contribution may be offered under that license as well.
@@ -0,0 +1,663 @@
 Copyright (C) 2026 seb
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                       Version 3, 19 November 2007
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            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
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    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.
    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 Also add information on how to contact you by electronic and paper mail.
  If your software can interact with users remotely through a computer
 network, you should also make sure that it provides a way for users to
 get its source.  For example, if your program is a web application, its
 interface could display a "Source" link that leads users to an archive
 of the code.  There are many ways you could offer source, and different
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 specific requirements.
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU AGPL, see
 <https://www.gnu.org/licenses/>.
@@ -0,0 +1,9 @@
 # License
 Gearslip is licensed under the GNU Affero General Public License v3.0. The full text is in `LICENSE`.
 You may use, run, and modify Gearslip freely. If you distribute a modified version, or let others use one over a network, you must publish your changes under the same license. The obligation follows the code even when you hand out no binary, which suits software that runs as a background service.
 ## Commercial licensing
 If the AGPL's terms don't work for you, the author sells a separate commercial license. The usual case is a company that wants to use Gearslip privately without publishing its changes. Terms, including any limits on modification, are set case by case. Contact me on Matrix; the address is on my profile.
@@ -0,0 +1,91 @@
 <img src="docs/icon/gearslip-icon.png" alt="Gearslip icon" width="96" height="96">
 # Gearslip
 Bring any app to your car screen.
 ## What Gearslip is
 Gearslip is an Android Auto client for the phone. It speaks the Android Auto protocol
 directly to a car head unit over USB, with no Google software in the path. Gearslip acts
 as a Car App Library host: an app that ships a car interface hands Gearslip a template,
 and Gearslip renders that template natively on the car screen. Nothing is mirrored from
 the phone. For apps without a car interface, Gearslip offers a separate screen-sharing
 mode.
 ## Features
 - **Phone calls.** Dial from a keypad, or search your contacts, then confirm before the
  call goes out.
 - **Navigation.** Gearslip hosts real Car App Library map apps on the car screen; Organic
  Maps and OsmAnd both work today.
 - **Music.** Browse, play, and queue tracks from a car-enabled media app, with a Now
  Playing view, an Up Next queue, and lyrics.
 - **The web.** A browser template with its own on-screen keyboard, for anything that
  doesn't ship a car interface of its own.
 - **Weather and the day ahead.** A dashboard screen shows the week's calendar next to
  the current and coming weather.
 - **Messages.** New messages appear as a small card on the car screen. Gearslip reads
  each one aloud, and you reply by voice or with a quick reply. Speech runs on the phone,
  so it needs no Google account.
 - **Notifications.** Only messages, missed calls, alarms, and reminders interrupt you.
  The rest wait on the dashboard.
 - **Car controls.** Steering wheel buttons, control knobs, and D-pads all work.
 - **Themes.** Choose flat buttons or skeuomorphic ones that look like real keys.
 ## Status
 - **The connection is wired only, for now.** Plug the phone into the head unit's USB port;
  Gearslip does not yet offer a wireless option.
 - **Setup walks you through it.** First launch asks for the Android Auto certificate,
  then one permission at a time, each with a plain reason and an Allow or Skip. A help
  screen inside the car answers anything setup didn't cover.
 - **Templated apps work.** Gearslip renders all 16 template types that the Car App
  Library defines, and it draws its own keyboard for search, sign-in, and text fields.
  It has been tested against several real navigation and media apps.
 - **Gearslip works with [LIVI](https://github.com/f-io/LIVI),** the open-source head unit
  used in homemade car dashboards.
 - **Some apps refuse Gearslip.** Spotify, Waze, and Google Messages use a version of
  Google's car library that accepts only Android Auto itself. Spotify still plays through
  Gearslip's own player.
 - **For now, Gearslip works with cars from before 2020.** Newer head units reject its
  certificate.
 - **Calls use the car's Bluetooth,** as they do in Android Auto. Pair the phone with the
  car to hear calls through its speakers.
 - **Audio reaches the car by capturing playback, not by mirroring the screen.** Android
  shows a screen-share consent dialog for this, even though Gearslip never reads the
  screen; it is the only way an ordinary app can capture another app's audio. The dialog
  appears once per drive.
 - **Gearslip needs no adb, root, or Shizuku.** Every feature relies on an ordinary
  Android permission or an on-device consent dialog. The setup guide offers two optional
  adb commands: one removes the audio dialog for good, and the other keeps notifications
  visible while audio plays.
 ## Building
 ```
 ./gradlew :gearslip:assembleDebug
 ```
 The APK lands at `build/Gearslip-debug.apk`.
 A release build needs a signing key. Copy `keystore.properties.example` to
 `keystore.properties`, fill in your own values, and run
 `./gradlew :gearslip:assembleRelease`. Git ignores both the properties file and the
 keystore. Without them, the debug build still works.
 ## Writing apps for Gearslip
 [docs/BUILDING_APPS.md](docs/BUILDING_APPS.md) specifies how to write apps that Gearslip
 can render: templated apps, media apps, and the Gearslip app protocol.
 ## Trademarks
 Android, Android Auto, Google Messages, and Waze are trademarks of Google LLC. Spotify is
 a trademark of Spotify AB. Gearslip is not affiliated with, endorsed by, or sponsored by
 any of these companies. All other names belong to their owners.
 ## License
 Gearslip is licensed under AGPL-3.0; see [LICENSE](LICENSE). The author offers a separate
 commercial license for private use outside the AGPL's terms; see [NOTICE.md](NOTICE.md).
@@ -0,0 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
    alias(libs.plugins.android.application) apply false
    alias(libs.plugins.kotlin.android) apply false
    alias(libs.plugins.kotlin.compose) apply false
 }
@@ -0,0 +1,477 @@
 # Building apps for Gearslip
 Gearslip renders four kinds of app on a car screen. This page specifies all four.
 | Kind | What it is | Status |
 | --- | --- | --- |
 | [Templated apps](#templated-apps) | An AndroidX Car App Library app. Gearslip hosts it. | Works today |
 | [Media apps](#media-apps) | A `MediaBrowserService` that opted in to Android Auto. | Works today |
 | [Messaging apps](#messaging-apps) | An app whose notifications opted in to Android Auto. | Works today |
 | [Gearslip apps](#gearslip-apps) | A native Gearslip screen, described over binder. | Specified here; not yet implemented |
 Write a templated app when your app fits the Car App Library's templates, because it runs today
 and it also runs on Android Auto. Write a media app when you ship audio. Write a Gearslip app
 when you want a screen the Car App Library cannot describe.
 Gearslip's package name is `app.seb3thehacker.gearslip`. It declares
 `android.car.permission.TEMPLATE_RENDERER`.
 ---
 ## Templated apps
 A templated app exports a `CarAppService`, describes each screen as a `Template`, and lets the
 host draw it. Gearslip implements the host half of that protocol, so an existing Android Auto app
 needs no Gearslip-specific code. Build it against the AndroidX Car App Library as you would for
 any other host.
 ### Letting Gearslip in
 Your app decides which hosts may render it, through the `HostValidator` your `CarAppService`
 returns.
 Gearslip declares `android.car.permission.TEMPLATE_RENDERER`. Car App Library 1.8.0-beta01
 and earlier, and 1.9.0-alpha01, accept any host holding it, so Gearslip passes the default
 validator. From 1.8.0-rc01 and 1.9.0-alpha02 the library checks that permission only on
 Android Automotive, so on a phone Gearslip passes only when your allowlist names it. Add this
 entry:
 ```xml
 <!-- res/values/arrays.xml -->
 <array name="hosts_allowlist">
    <item>4cc56ebdd13a54d260eca9b7e2b2ae6b30e2f225bfda8f508f0709edf084948b,app.seb3thehacker.gearslip</item>
 </array>
 ```
 ```java
@Override
 public HostValidator createHostValidator() {
    return new HostValidator.Builder(getApplicationContext())
            .addAllowedHosts(R.array.hosts_allowlist)
            .build();
 }
 ```
 That digest belongs to Gearslip's release signing certificate. A Gearslip you built yourself
 carries your own debug key and a different digest, so read the fingerprint off the APK you
 actually installed when an allowlist entry fails to match.
 Write each entry as the digest first, then a comma, then the package name. The digest is the
 SHA-256 of the host's signing certificate as 64 lowercase hex characters, with no colons and no
 `0x` prefix. The builder lowercases the entry and strips spaces, but it keeps colons, so convert
 `keytool` output before pasting it:
 ```
 keytool -list -v -keystore <keystore> -alias <alias> \
  | grep 'SHA256:' | cut -d' ' -f3 | tr -d ':' | tr 'A-Z' 'a-z'
 ```
 Reading the installed APK is more reliable, because it fingerprints the key that actually signed
 the build, and `apksigner` already prints the required format:
 ```
 apksigner verify --print-certs Gearslip.apk | grep 'SHA-256 digest'
 ```
 During development, `HostValidator.ALLOW_ALL_HOSTS_VALIDATOR` accepts every host. Ship a real
 validator instead.
 An app that refuses a host returns no binder at all. Gearslip reports that as
 `the app refused to bind - host not accepted`. Your own side logs the reason under the tag
 `CarApp.Val`, including the exact `addAllowedHost` call to add, so read logcat there first.
 ### Discovery
 Gearslip finds templated apps by querying `androidx.car.app.CarAppService`, then re-querying with
 each known category to recover which ones your intent filter matched. Declare the categories you
 belong to, or Gearslip files you under `app`:
 ```xml
 <service android:name=".MyCarAppService" android:exported="true">
    <intent-filter>
        <action android:name="androidx.car.app.CarAppService" />
        <category android:name="androidx.car.app.category.NAVIGATION" />
    </intent-filter>
 </service>
 ```
 Gearslip recognises the `NAVIGATION`, `POI`, `PARKING`, `CHARGING`, `MESSAGING`, `CALLING`,
 `SETTINGS`, `IOT` and `WEATHER` categories. Navigation apps start automatically on the home
 screen when the driver used them last.
 ### The handshake
 Gearslip offers car API level 8. It negotiates down to
 `min(8, yourLatestCarAppApiLevel)` and refuses the app when that falls below your
 `minCarAppApiLevel`, rather than drawing it wrongly. Keep your minimum at 8 or below.
 ### Templates Gearslip renders
 Gearslip renders all sixteen templates. Ten describe their own content:
 `ListTemplate`, `GridTemplate`, `PaneTemplate`, `MessageTemplate`, `LongMessageTemplate`,
 `SearchTemplate`, `SignInTemplate`, `TabTemplate`, `SectionedItemTemplate`,
 `MediaPlaybackTemplate`.
 Six draw a map underneath and take chrome over the top:
 `NavigationTemplate`, `MapWithContentTemplate`, `MapTemplate`, `PlaceListNavigationTemplate`,
 `RoutePreviewNavigationTemplate`, `PlaceListMapTemplate`.
 `SearchTemplate` and `SignInTemplate` need text. A phone keyboard cannot appear on the car's
 virtual display, so Gearslip draws its own and feeds the result back through the template's
 listener.
 ### Content limits
 Gearslip reports these limits through the constraint service, and expects you to honour them:
 | Limit | Value |
 | --- | --- |
 | Grid items | 12 |
 | Pane rows | 4 |
 | Route list rows | 3 |
 | Anything else | 12 |
 Gearslip enables app-driven refresh, so you may invalidate your own template without the driver
 touching the screen.
 ### Drawing a map
 A navigation app draws its own pixels. Gearslip lends it a real `Surface` taken from a
 `SurfaceView` inside the car's virtual display, so your map reaches the head unit through the
 existing video pipe. Gearslip never reads those pixels back.
 Gearslip then reports which part of that surface the driver can see. Treat the visible area as
 the region safe for your own controls, and the stable area as the region that never gets
 covered. Gearslip reports the same area for both, and it depends on the template:
 | Template | What Gearslip covers |
 | --- | --- |
 | `NavigationTemplate` | A strip along the bottom for the trip estimate |
 | `MapWithContentTemplate`, `MapTemplate`, and the place list and route preview templates | A content pane on the left |
 The turn card and map buttons float over the visible area, as they do in Android Auto.
 Your app receives four gestures, never raw touches: `onClick`, `onScroll`, `onFling` and
 `onScale`. Coordinates are surface pixels. Scroll distances follow `GestureDetector`'s
 convention, which reports the previous position minus the current one.
 ### Car hardware
 A phone knows nothing about a car's sensors, so Gearslip answers every car-hardware request with
 "unsupported". It answers rather than ignores: an app whose sensor manager waits for a reply
 hangs when the host stays silent. Design for a host that reports no vehicle data at all.
 Gearslip accepts the suggestions an app pushes and discards them, because no screen shows them
 yet. Your app will not fail for offering them.
 ### Day and night
 Gearslip decides whether it is dark outside and pushes that to your app as a configuration
 change, with `UI_MODE_NIGHT_YES` or `UI_MODE_NIGHT_NO`. Take your map style from the
 configuration the host reports. The configuration also carries the car's density, screen size and
 orientation, and always sets `UI_MODE_TYPE_CAR`.
 ---
 ## Media apps
 Gearslip draws the media UI itself: browsing, artwork, lyrics, transport controls and a
 now-playing pill in the nav bar. Your app supplies a browse tree and a media session.
 Gearslip lists a media app when it exports a `MediaBrowserService` **and** declares the Android
 Auto meta-data. Both halves are required, because the service alone also appears on phone-only
 players that expose a browser to Bluetooth and Wear:
 ```xml
 <application>
    <meta-data
        android:name="com.google.android.gms.car.application"
        android:resource="@xml/automotive_app_desc" />
 </application>
 ```
 ```xml
 <!-- res/xml/automotive_app_desc.xml -->
 <automotiveApp>
    <uses name="media" />
 </automotiveApp>
 ```
 Publish playback state, metadata, duration and artwork through your `MediaSession`, and support
 play, pause, next, previous and seek. Gearslip reconnects to the app the driver used last and
 can start it playing on connection.
 ---
 ## Messaging apps
 Gearslip shows conversations from the notifications your app already posts, as Android Auto
 does. Your app needs no car screen of its own.
 Gearslip lists a messaging app when its car descriptor declares notifications:
 ```xml
 <!-- res/xml/automotive_app_desc.xml -->
 <automotiveApp>
    <uses name="notification" />
 </automotiveApp>
 ```
 Reference it from the same `com.google.android.gms.car.application` meta-data that a media app
 uses. Opening your tile on the car screen shows your recent conversations.
 ### Posting messages
 Post each conversation as a `MessagingStyle` notification. Gearslip reads the conversation
 title, each message's sender and text, and whether the chat is a group, and shows the last eight
 messages. Leave the sender empty on the phone owner's own messages; Gearslip treats a message
 with no sender as one the driver sent.
 Gearslip reads new messages aloud and lets the driver reply by voice or with a quick reply. For
 that, attach two actions, either to the notification or to its `WearableExtender`:
 - **Reply:** an action carrying a `RemoteInput` that allows free-form input. Gearslip fills it
  with the driver's reply and fires the action's intent.
 - **Mark as read:** an action with `SEMANTIC_ACTION_MARK_AS_READ`. Gearslip shows a Mark read
  button when you provide it.
 ### Which notifications interrupt the driver
 Gearslip pops up a card for a conversation, a notification with a reply action, or a
 notification in the `msg`, `missed_call`, `alarm`, `reminder` or `event` category. A channel
 below default importance never pops up. Every other notification waits quietly on the
 dashboard.
 Gearslip drops these altogether:
 - ongoing notifications and group summaries;
 - the `transport`, `progress`, `service`, `sys` and `navigation` categories; and
 - media notifications, because the player already shows them.
 ---
 ## Gearslip apps
 This section specifies protocol version 1. Gearslip does not yet implement it.
 A Gearslip app describes a screen and lets Gearslip render it in Compose, using the car's theme,
 the driver's chosen scale and the current day or night state. Your app draws nothing and receives
 no surface. Everything the driver sees comes from the model below, which means your screen
 matches the rest of the car UI and cannot be made unreadable.
 Write a Gearslip app to reach the parts of the car UI the Car App Library does not cover. Write a
 templated app if you need to draw a map, because version 1 lends no surface.
 ### Discovery
 Export a service with the Gearslip action and declare the protocol version it speaks:
 ```xml
 <service
    android:name=".GearslipService"
    android:exported="true">
    <intent-filter>
        <action android:name="app.seb3thehacker.gearslip.APP" />
    </intent-filter>
    <meta-data
        android:name="app.seb3thehacker.gearslip.version"
        android:value="1" />
 </service>
 ```
 Gearslip scans for these services once per car session and shows each one as a tile in the
 launcher, under your application's own label and icon. To override either on the car screen, add
 `app.seb3thehacker.gearslip.label` or `app.seb3thehacker.gearslip.icon`.
 Gearslip binds to any app that declares this service. It asks the driver for nothing, exactly as
 a head unit asks nothing before running an Android Auto app.
 Gearslip binds your service when the driver opens your tile and unbinds it when they leave. Keep
 no state that a rebind cannot rebuild.
 ### The interface
 Copy these three files into `src/main/aidl/app/seb3thehacker/gearslip/api/`. A published artifact
 will replace them.
 ```aidl
 // IGearslipApp.aidl
 package app.seb3thehacker.gearslip.api;
 import app.seb3thehacker.gearslip.api.IGearslipHost;
 import app.seb3thehacker.gearslip.api.IScreenCallback;
 interface IGearslipApp {
    /** Return the highest version both sides speak. Gearslip passes the version it offers. */
    int negotiate(int hostVersion);
    void onCreate(IGearslipHost host);
    void onStart();
    void onStop();
    /** Describe the current screen. Answer through the callback, on any thread. */
    void getScreen(IScreenCallback callback);
    void onAction(String actionId);
    void onTextInput(String fieldId, String text);
 }
 ```
 ```aidl
 // IGearslipHost.aidl
 package app.seb3thehacker.gearslip.api;
 interface IGearslipHost {
    /** Tell Gearslip the screen changed. It calls getScreen again. */
    void invalidate();
    /** Open the car keyboard. The result arrives at onTextInput. */
    void requestTextInput(String fieldId, String prompt, String initialText);
    String getEnvironment();
    String getNowPlaying();
    /** One of play, pause, toggle, next, previous. */
    void mediaCommand(String command);
    /** Leave the app and return to the launcher. */
    void finish();
 }
 ```
 ```aidl
 // IScreenCallback.aidl
 package app.seb3thehacker.gearslip.api;
 interface IScreenCallback {
    void onScreen(String screenJson);
    void onError(String message);
 }
 ```
 ### Versioning
 Gearslip calls `negotiate` first, passing the version it offers. Return the highest version you
 also speak. Gearslip uses that version for the rest of the connection and drops the app when the
 answer exceeds what it offered. This mirrors how Gearslip negotiates car API levels with
 templated apps, and it lets either side move first.
 Version 1 is the only version. Reject anything you do not recognise by returning 1.
 ### Lifecycle
 1. Gearslip binds your service and calls `negotiate`.
 2. Gearslip calls `onCreate`, handing you the host interface. Keep it.
 3. Gearslip calls `onStart`, then `getScreen`.
 4. You answer through `onScreen`. Gearslip renders it.
 5. The driver taps something. Gearslip calls `onAction` with that element's id.
 6. Your screen changes, so you call `invalidate`. Gearslip calls `getScreen` again.
 7. The driver leaves. Gearslip calls `onStop` and unbinds.
 Every call arrives on a binder thread. Answer `getScreen` promptly; Gearslip shows the previous
 screen until you do. Gearslip coalesces repeated `invalidate` calls.
 ### The screen model
 Answer `getScreen` with a JSON object.
 ```json
 {
  "protocol": 1,
  "type": "list",
  "title": "Stations",
  "items": [
    { "id": "r6", "title": "BBC Radio 6", "subtitle": "Music", "icon": "play" },
    { "id": "r4", "title": "BBC Radio 4", "subtitle": "Speech", "icon": "play" }
  ],
  "actions": [
    { "id": "refresh", "title": "Refresh", "icon": "refresh", "primary": true }
  ]
 }
 ```
 `type` takes one of four values:
 | Type | Renders as | Uses |
 | --- | --- | --- |
 | `list` | A vertical list of rows | `items` |
 | `grid` | A grid of tiles | `items` |
 | `pane` | A short detail pane beside its actions | `items`, `actions` |
 | `message` | A single message and its actions | `text`, `actions` |
 An item takes `id`, `title`, and optionally `subtitle`, `icon` and `enabled`. Gearslip calls
 `onAction` with the item's `id` when the driver taps it. An item with `"type": "input"` renders
 as a text field carrying `value`; tapping it opens the car keyboard, and the result arrives at
 `onTextInput` under the item's id.
 An action takes `id`, `title`, and optionally `icon` and `primary`. Gearslip renders at most two
 actions and emphasises the primary one.
 `icon` names a built-in glyph: `play`, `pause`, `next`, `previous`, `search`, `settings`, `home`,
 `apps`, `notifications`, `info`, `share`, `place`, `favorite`, `add`, `remove`, `refresh`,
 `check`, `error`. Version 1 carries no images. Gearslip drops an unknown name and renders the
 row without a glyph.
 Gearslip truncates any list past the limits in [Content limits](#content-limits) and shortens
 long strings. Send a screen that fits, rather than one Gearslip has to cut.
 ### Reading the car
 `getEnvironment` returns the car's current state:
 ```json
 {
  "protocol": 1,
  "darkOutside": true,
  "moving": false,
  "frameWidth": 800,
  "frameHeight": 480,
  "densityDpi": 160,
  "batteryPercent": 82,
  "charging": true,
  "vehicle": "Honda"
 }
 ```
 `darkOutside` reports whether Gearslip believes it is dark, from the light sensor or the clock.
 `moving` reports whether the phone's GPS shows the car moving. Both change during a session, so
 read them each time you build a screen rather than caching them.
 Treat `moving` as a comfort signal, not a safety guarantee. It reads false whenever the fix is
 stale or missing, which includes tunnels and car parks.
 ### Controlling media
 `getNowPlaying` returns what the car is playing, whichever app owns it:
 ```json
 { "title": "Sleepwalk", "artist": "Santo & Johnny", "playing": true, "durationMs": 142000 }
 ```
 `mediaCommand` sends one of `play`, `pause`, `toggle`, `next` or `previous` to that app. Both
 work regardless of which app is playing, so use them to put transport controls on your own
 screen. Ship audio through a media app instead of driving these.
 ### Text input
 A phone keyboard cannot appear on the car's virtual display, so Gearslip draws its own. Call
 `requestTextInput` with a field id, a prompt and any existing text. Gearslip opens the keyboard
 and calls `onTextInput` as the driver types, so treat each call as the current contents rather
 than a final answer.
 ### What version 1 leaves out
 Version 1 lends no surface, so no Gearslip app draws its own pixels. It carries no images beyond
 the built-in glyphs. It places apps only in the launcher; contributing a dashboard card or a
 home-screen pane comes later. Anything that needs its own rendering belongs in a templated app.
 ---
 ## Further reading
 - [README.md](../README.md) - what Gearslip is.
 - [CONTRIBUTING.md](../CONTRIBUTING.md) - how to build Gearslip and report bugs.
 - [Android for Cars App Library](https://developer.android.com/training/cars/apps) - the
  reference for templated apps.
@@ -0,0 +1,14 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="432" height="432" viewBox="0 0 108 108">
  <defs>
    <linearGradient id="trail" x1="73.4" y1="46.0" x2="95.8" y2="44.5" gradientUnits="userSpaceOnUse">
      <stop offset="0%" stop-color="#8C1F1F" stop-opacity="0"/>
      <stop offset="100%" stop-color="#8C1F1F" stop-opacity="0.7"/>
    </linearGradient>
  </defs>
  <rect width="108" height="108" fill="#0c0c0d"/>
  <circle cx="54" cy="54" r="52" fill="#131415"/>
  <path d="M 73.23,47.15 L 94.77,51.90 L 96.89,37.05 L 73.57,44.78 Z" fill="url(#trail)"/>
  <path d="M 54.00,27.00 L 59.99,19.91 Q 61.02,18.69 62.50,19.30 L 72.52,23.45 Q 74.00,24.07 73.87,25.66 L 73.23,33.31 Q 73.09,34.91 73.70,36.39 L 80.39,52.52 Q 81.00,54.00 82.22,55.03 L 88.09,59.99 Q 89.31,61.02 88.70,62.50 L 84.55,72.52 Q 83.93,74.00 82.34,73.87 L 73.09,73.09 Q 73.09,73.09 73.09,73.09 L 73.09,73.09 Q 73.09,73.09 73.09,73.09 L 73.87,82.34 Q 74.00,83.93 72.52,84.55 L 62.50,88.70 Q 61.02,89.31 59.99,88.09 L 54.00,81.00 Q 54.00,81.00 54.00,81.00 L 54.00,81.00 Q 54.00,81.00 54.00,81.00 L 48.01,88.09 Q 46.98,89.31 45.50,88.70 L 35.48,84.55 Q 34.00,83.93 34.13,82.34 L 34.91,73.09 Q 34.91,73.09 34.91,73.09 L 34.91,73.09 Q 34.91,73.09 34.91,73.09 L 25.66,73.87 Q 24.07,74.00 23.45,72.52 L 19.30,62.50 Q 18.69,61.02 19.91,59.99 L 27.00,54.00 Q 27.00,54.00 27.00,54.00 L 27.00,54.00 Q 27.00,54.00 27.00,54.00 L 19.91,48.01 Q 18.69,46.98 19.30,45.50 L 23.45,35.48 Q 24.07,34.00 25.66,34.13 L 34.91,34.91 Q 34.91,34.91 34.91,34.91 L 34.91,34.91 Q 34.91,34.91 34.91,34.91 L 34.13,25.66 Q 34.00,24.07 35.48,23.45 L 45.50,19.30 Q 46.98,18.69 48.01,19.91 L 54.00,27.00 Q 54.00,27.00 54.00,27.00 L 54.00,27.00 Q 54.00,27.00 54.00,27.00 Z" fill="#8B9096"/>
  <path d="M 92.78,34.42 L 99.94,37.20 Q 101.43,37.78 101.34,39.37 L 100.67,50.20 Q 100.58,51.80 99.03,52.19 L 91.58,54.08 Q 90.03,54.47 90.13,52.87 L 91.19,35.44 Q 91.29,33.84 92.78,34.42 Z" fill="#8C1F1F"/>
  <circle cx="54" cy="54" r="12" fill="#0c0c0d"/>
 </svg>
@@ -0,0 +1,14 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="432" height="432" viewBox="0 0 108 108">
  <defs>
    <linearGradient id="trail" x1="73.4" y1="46.0" x2="95.8" y2="44.5" gradientUnits="userSpaceOnUse">
      <stop offset="0%" stop-color="#8C1F1F" stop-opacity="0"/>
      <stop offset="100%" stop-color="#8C1F1F" stop-opacity="0.7"/>
    </linearGradient>
  </defs>
  <rect width="108" height="108" fill="#0c0c0d"/>
  <circle cx="54" cy="54" r="52" fill="#131415"/>
  <path d="M 73.23,47.15 L 94.77,51.90 L 96.89,37.05 L 73.57,44.78 Z" fill="url(#trail)"/>
  <path d="M 54.00,27.00 L 61.02,18.69 L 74.00,24.07 L 73.09,34.91 L 81.00,54.00 L 89.31,61.02 L 83.93,74.00 L 73.09,73.09 L 73.09,73.09 L 74.00,83.93 L 61.02,89.31 L 54.00,81.00 L 54.00,81.00 L 46.98,89.31 L 34.00,83.93 L 34.91,73.09 L 34.91,73.09 L 24.07,74.00 L 18.69,61.02 L 27.00,54.00 L 27.00,54.00 L 18.69,46.98 L 24.07,34.00 L 34.91,34.91 L 34.91,34.91 L 34.00,24.07 L 46.98,18.69 L 54.00,27.00 Z" fill="#8B9096"/>
  <path d="M 91.29,33.84 L 101.43,37.78 L 100.58,51.80 L 90.03,54.47 Z" fill="#8C1F1F"/>
  <circle cx="54" cy="54" r="12" fill="#0c0c0d"/>
 </svg>
@@ -0,0 +1,176 @@
 import math
 def pt(cx, cy, r, deg):
    a = math.radians(deg - 90)
    return (cx + r*math.cos(a), cy + r*math.sin(a))
 def gear_points(cx, cy, teeth, outer_r, inner_r, tooth_frac=0.5):
    slice_w = 360.0 / teeth
    gap = slice_w * (1 - tooth_frac)
    pts = []
    for i in range(teeth):
        start = i * slice_w
        a1 = start + gap/2
        a2 = a1 + slice_w*tooth_frac
        pts.append(pt(cx, cy, inner_r, start))
        pts.append(pt(cx, cy, outer_r, a1))
        pts.append(pt(cx, cy, outer_r, a2))
        pts.append(pt(cx, cy, inner_r, start + slice_w))
    return pts
 def path_from_pts(pts):
    d = f"M {pts[0][0]:.2f},{pts[0][1]:.2f} "
    for p in pts[1:]:
        d += f"L {p[0]:.2f},{p[1]:.2f} "
    return d + "Z"
 def rotate(pts, ocx, ocy, deg):
    a = math.radians(deg)
    out = []
    for x, y in pts:
        x0, y0 = x-ocx, y-ocy
        out.append((x0*math.cos(a)-y0*math.sin(a)+ocx, x0*math.sin(a)+y0*math.cos(a)+ocy))
    return out
 def scale_pts(pts, ocx, ocy, s):
    return [((x-ocx)*s+ocx, (y-ocy)*s+ocy) for x, y in pts]
 cx, cy = 54, 54
 teeth = 8
 outer_r = 36
 inner_r = 27
 all_pts = gear_points(cx, cy, teeth, outer_r, inner_r)
 broken_idx = 1
 body_pts = [p for i, p in enumerate(all_pts) if not (4*broken_idx <= i < 4*broken_idx+4)]
 tooth_pts = all_pts[4*broken_idx:4*broken_idx+4]
 tooth_cx = sum(p[0] for p in tooth_pts)/4
 tooth_cy = sum(p[1] for p in tooth_pts)/4
 dx, dy = 14, 2
 final_pts = rotate([(x+dx, y+dy) for x, y in tooth_pts], tooth_cx+dx, tooth_cy+dy, 26)
 final_cx, final_cy = tooth_cx+dx, tooth_cy+dy
 trail_half_w_near = 1.2
 trail_half_w_far = 7.5
 perp = (-dy, dx)
 plen = math.hypot(*perp)
 perp = (perp[0]/plen, perp[1]/plen)
 gap_angle = math.atan2(tooth_cy - cy, tooth_cx - cx)
 extend_r = inner_r - 6
 gap_x = cx + math.cos(gap_angle) * extend_r
 gap_y = cy + math.sin(gap_angle) * extend_r
 near1 = (gap_x + perp[0]*trail_half_w_near, gap_y + perp[1]*trail_half_w_near)
 near2 = (gap_x - perp[0]*trail_half_w_near, gap_y - perp[1]*trail_half_w_near)
 far1 = (final_cx + perp[0]*trail_half_w_far, final_cy + perp[1]*trail_half_w_far)
 far2 = (final_cx - perp[0]*trail_half_w_far, final_cy - perp[1]*trail_half_w_far)
 trail_pts = [near1, far1, far2, near2]
 hub_r = 12
 # --- scale everything down to fit the adaptive-icon safe zone (66dp diameter circle) ---
 SCALE = 0.66
 def S(pts):
    return scale_pts(pts, cx, cy, SCALE)
 body_s = S(body_pts)
 final_s = S(final_pts)
 trail_s = S(trail_pts)
 hub_r_s = hub_r * SCALE
 gap_x_s, gap_y_s = scale_pts([(gap_x, gap_y)], cx, cy, SCALE)[0]
 final_cx_s, final_cy_s = scale_pts([(final_cx, final_cy)], cx, cy, SCALE)[0]
 body_path = path_from_pts(body_s)
 final_path = path_from_pts(final_s)
 trail_path = path_from_pts(trail_s)
 GREY = "#8B9096"
 RED = "#8C1F1F"
 BG = "#0c0c0d"
 RING = "#131415"
 # ===== 1. Background: full-bleed, unscaled =====
 bg_xml = f'''<?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:pathData="M0,0h108v108h-108z"
        android:fillColor="{BG}"/>
    <path
        android:pathData="M54,2 A52,52 0 1,1 53.99,2 Z"
        android:fillColor="{RING}"/>
 </vector>
 '''
 # ===== 2. Foreground: gear + broken piece + trail, scaled into the safe zone =====
 # Trail uses a gradient (narrow near the gear, fading out) via an <aapt:attr> gradient,
 # same visual as the mockup.
 fg_xml = f'''<?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path android:pathData="{trail_path}">
        <aapt:attr name="android:fillColor">
            <gradient
                android:type="linear"
                android:startX="{gap_x_s:.2f}"
                android:startY="{gap_y_s:.2f}"
                android:endX="{final_cx_s:.2f}"
                android:endY="{final_cy_s:.2f}">
                <item android:offset="0" android:color="#00{RED[1:]}"/>
                <item android:offset="1" android:color="{RED}"/>
            </gradient>
        </aapt:attr>
    </path>
    <path
        android:pathData="{body_path}"
        android:fillColor="{GREY}"/>
    <path
        android:pathData="{final_path}"
        android:fillColor="{RED}"/>
    <path
        android:pathData="M{cx},{cy-hub_r_s:.2f} A{hub_r_s:.2f},{hub_r_s:.2f} 0 1,1 {cx-0.01:.2f},{cy-hub_r_s:.2f} Z"
        android:fillColor="{BG}"/>
 </vector>
 '''
 # ===== 3. Monochrome: same silhouette, single alpha-bearing color for Material You
 #     theming. The system substitutes its own tint - the fillColor value here is
 #     irrelevant, only the shape/alpha matters. Trail kept at a lower alpha so the
 #     fade effect survives tinting too.
 mono_xml = f'''<?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:pathData="{trail_path}"
        android:fillColor="#FF000000"
        android:fillAlpha="0.35"/>
    <path
        android:pathData="{body_path}"
        android:fillColor="#FF000000"/>
    <path
        android:pathData="{final_path}"
        android:fillColor="#FF000000"/>
    <path
        android:pathData="M{cx},{cy-hub_r_s:.2f} A{hub_r_s:.2f},{hub_r_s:.2f} 0 1,1 {cx-0.01:.2f},{cy-hub_r_s:.2f} Z"
        android:fillColor="#00000000"/>
 </vector>
 '''
 out = '/tmp/claude-1000/-home-seb-AABrowser/dadb0938-9338-4349-968f-4a89bc8de777/scratchpad/icon'
 open(f'{out}/ic_launcher_background.xml', 'w').write(bg_xml)
 open(f'{out}/ic_launcher_foreground.xml', 'w').write(fg_xml)
 open(f'{out}/ic_launcher_monochrome.xml', 'w').write(mono_xml)
 print("written")
@@ -0,0 +1,10 @@
 # Build output is redirected to <root>/build/gearslip/ (see build.gradle.kts), already
 # covered by the root .gitignore's /build - this is just a safety net in case that ever
 # changes back.
 build/
 # User-supplied certificate material - never checked in (see CertProvider.kt).
 phone.p12
 phone.pass
 *.crt
 *.key
@@ -0,0 +1,146 @@
 import java.util.Properties
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
 /**
 * Gearslip: a phone-side Android Auto client built against the reverse-engineered AA wire
 * protocol, so a non-Google app can authenticate to and project onto a real car head unit
 * with no gearhead in the path. No third-party dependencies: the X.509 certificate is
 * generated by hand (see `SelfSignedCert`) so there is no BouncyCastle version to track and
 * no second crypto provider to collide with Conscrypt.
 */
 plugins {
    alias(libs.plugins.android.application)
    alias(libs.plugins.kotlin.compose)
 }
 // The release signing key, read from an untracked keystore.properties beside this file or at the
 // repository root. Third-party apps allowlist Gearslip by the SHA-256 of this certificate, so the
 // key must stay the same for the life of the project - and must never be committed.
 val keystoreProperties = Properties().apply {
    listOf(
        rootProject.file("keystore.properties"),
        project.file("keystore.properties"),
    ).firstOrNull { it.exists() }?.inputStream()?.use { load(it) }
 }
 android {
    namespace = "app.seb3thehacker.gearslip"
    compileSdk = 37
    defaultConfig {
        applicationId = "app.seb3thehacker.gearslip"
        minSdk = 31
        targetSdk = 37
        versionCode = 7
        versionName = "0.1.10-alpha"
        manifestPlaceholders["appLabel"] = "Gearslip"
    }
    signingConfigs {
        // Declared only when the properties file is present, so a clone without the key still
        // builds debug; assembleRelease then falls back to unsigned rather than failing here.
        if (keystoreProperties.getProperty("storeFile") != null) {
            create("release") {
                storeFile = rootProject.file(keystoreProperties.getProperty("storeFile"))
                storePassword = keystoreProperties.getProperty("storePassword")
                keyAlias = keystoreProperties.getProperty("keyAlias")
                keyPassword = keystoreProperties.getProperty("keyPassword")
            }
        }
    }
    buildTypes {
        release {
            signingConfig = signingConfigs.findByName("release")
        }
        // Its own package, so a dev build installs beside the release one instead of over it.
        // Signed with the release key when it's here: both builds declare the car template
        // permission, and Android refuses a second app declaring it under a different key.
        debug {
            applicationIdSuffix = ".dev"
            signingConfigs.findByName("release")?.let { signingConfig = it }
            manifestPlaceholders["appLabel"] = "Gearslip Dev"
        }
    }
    buildFeatures {
        buildConfig = true
    }
    // Keeps build output out of the module folder: <root>/build/gearslip/... instead of
    // <root>/gearslip/build/..., so everything this project produces lands under one
    // root-level build/ directory.
    layout.buildDirectory.set(rootProject.layout.buildDirectory.dir("gearslip"))
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_21
        targetCompatibility = JavaVersion.VERSION_21
    }
    defaultConfig {
        // Speech-to-text ships for 64-bit ARM only: every phone Gearslip runs on, and one copy
        // of the native library instead of four.
        ndk { abiFilters += "arm64-v8a" }
    }
    ndkVersion = "27.1.12297006"
    externalNativeBuild {
        cmake {
            path = file("src/main/cpp/CMakeLists.txt")
            version = "3.22.1"
        }
    }
    androidResources {
        // Model weights barely compress, and stored plainly they stream straight out of the APK.
        noCompress += "bin"
    }
    testOptions {
        // GearslipLog calls android.util.Log, which is a stub on the local JVM.
        unitTests.isReturnDefaultValues = true
    }
 }
 // Renames the produced APK and moves it to the root build/ folder (<root>/build/Gearslip-debug.apk)
 // after the fact rather than fighting AGP's variant-output API across versions - simpler and
 // doesn't break when that API moves again.
 tasks.register("renameApk") {
    doLast {
        val rootBuildDir = rootProject.layout.buildDirectory.get().asFile
        layout.buildDirectory.dir("outputs/apk").get().asFile.walkTopDown()
            .filter { it.extension == "apk" }
            .toList()
            .forEach { apk ->
                val renamed = File(rootBuildDir, "Gearslip-${apk.parentFile.name}.apk")
                apk.copyTo(renamed, overwrite = true)
                apk.delete()
            }
    }
 }
 tasks.matching { it.name.startsWith("assemble") }.configureEach { finalizedBy("renameApk") }
 dependencies {
    // Only for the XML window theme (Theme.Material3.DynamicColors); every screen is Compose.
    implementation(libs.google.material)
    implementation(platform(libs.androidx.compose.bom))
    implementation(libs.androidx.compose.ui)
    implementation(libs.androidx.compose.material3)
    implementation(libs.androidx.compose.material.icons.core)
    implementation(libs.androidx.activity.compose)
    implementation(libs.androidx.lifecycle.runtime.compose)
    // Used from the host side, not the app side: Gearslip renders other apps' templates rather
    // than publishing its own, so this is here for the AIDL interfaces and the model classes
    // their Bundleables deserialize into.
    implementation(libs.androidx.car.app)
    implementation(libs.androidx.car.app.projected)
    implementation(libs.androidx.media)
    testImplementation(libs.junit)
 }
 tasks.withType<KotlinJvmCompile>().configureEach {
    compilerOptions {
        jvmTarget.set(JvmTarget.JVM_21)
    }
 }
@@ -0,0 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <!-- Debug builds only: renders the car UI to PNGs so it can be checked without a car. -->
        <activity android:name="app.seb3thehacker.gearslip.CarPreviewActivity" android:exported="true" />
    </application>
 </manifest>
@@ -0,0 +1,62 @@
 package app.seb3thehacker.gearslip
 import app.seb3thehacker.gearslip.audio.CarAudio
 import kotlin.math.abs
 /**
 * Debug-only stand-in for the head unit's media audio sink.
 *
 * The car end of the audio path can only be exercised in a car, but everything before it - the
 * setting, the consent dialog, the capture service, and whether the media app allows itself to be
 * heard at all - is phone-side and can be tested at a desk. This sink takes the place of
 * [AudioLink] so that path runs to completion, and reports what arrived.
 *
 *   adb shell am start -n app.seb3thehacker.gearslip/.CarPreviewActivity \
 *       --ei w 800 --ei h 480 --ez audio true --ei snaps 10
 *
 * A healthy run logs a rising byte count and a peak well above zero. A byte count that rises with
 * a peak of zero means the app refused to be captured.
 */
 class BenchAudioSink(override val sampleRate: Int = 48_000, override val channels: Int = 2) : CarAudio.Link {
    private var chunks = 0
    private var bytes = 0L
    private var peak = 0
    private var reportedAt = 0L
    override fun start() {
        chunks = 0
        bytes = 0
        peak = 0
        reportedAt = System.currentTimeMillis()
        GearslipLog.i("bench sink: started - pretending to be a ${sampleRate}Hz x$channels car sink")
    }
    override fun stop() {
        GearslipLog.i("bench sink: stopped after $chunks chunks / $bytes bytes")
    }
    override fun write(pcm: ByteArray, size: Int) {
        chunks++
        bytes += size
        for (i in 0 until size - 1 step 2) {
            val sample = (pcm[i].toInt() and 0xFF) or (pcm[i + 1].toInt() shl 8)
            peak = maxOf(peak, abs(sample.toShort().toInt()))
        }
        val now = System.currentTimeMillis()
        if (now - reportedAt < REPORT_MS) return
        reportedAt = now
        val seconds = bytes / (sampleRate.toDouble() * channels * 2)
        GearslipLog.i(
            "bench sink: %d chunks / %d bytes (%.1fs of audio), peak %.3f%s".format(
                chunks, bytes, seconds, peak / 32768f,
                if (peak == 0) " - SILENT, the app is not letting itself be captured" else "",
            ),
        )
        peak = 0
    }
    companion object {
        private const val REPORT_MS = 2_000L
    }
 }
@@ -0,0 +1,171 @@
 package app.seb3thehacker.gearslip
 import android.graphics.Bitmap
 import android.graphics.PixelFormat
 import android.hardware.display.DisplayManager
 import android.media.ImageReader
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.view.MotionEvent
 import androidx.activity.ComponentActivity
 import androidx.activity.result.contract.ActivityResultContracts
 import app.seb3thehacker.gearslip.audio.AudioCaptureService
 import app.seb3thehacker.gearslip.audio.CarAudio
 import app.seb3thehacker.gearslip.car.CarEnvironment
 import app.seb3thehacker.gearslip.car.CarSettings
 import app.seb3thehacker.gearslip.car.CarUi
 import java.io.File
 import java.io.FileOutputStream
 /**
 * Debug-only harness: runs the real car UI on a virtual display (the same path a head unit
 * gets), taps where told, and saves what it rendered as PNGs in the external files dir.
 *
 *   adb shell am start -n app.seb3thehacker.gearslip/.CarPreviewActivity \
 *       --ei w 800 --ei h 480 --ei dpi 160 --es taps "400,440;90,440"
 *
 * Writes preview-0.png (before any tap), then one more per tap.
 */
 class CarPreviewActivity : ComponentActivity() {
    private val main = Handler(Looper.getMainLooper())
    private var projector: ScreenProjector? = null
    private var reader: ImageReader? = null
    @Volatile private var latest: Bitmap? = null
    private val audioPermission = registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
        if (granted) askAudioCapture() else CarAudio.denied()
    }
    private val audioConsent = registerForActivityResult(
        androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult(),
    ) { result ->
        val data = result.data
        if (result.resultCode == RESULT_OK && data != null) {
            AudioCaptureService.start(this, result.resultCode, data)
        } else {
            GearslipLog.w("preview: audio capture consent declined")
            CarAudio.denied()
        }
    }
    private fun askAudioCapture() {
        val manager = getSystemService(android.media.projection.MediaProjectionManager::class.java)
        runCatching { audioConsent.launch(manager.createScreenCaptureIntent()) }
            .onFailure { GearslipLog.e("preview: could not ask for audio capture", it); CarAudio.denied() }
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        GearslipLog.init(this)
        CarSettings.init(this)
        CarEnvironment.start(this)
        val w = intent.getIntExtra("w", 800)
        val h = intent.getIntExtra("h", 480)
        val dpi = intent.getIntExtra("dpi", 160)
        val taps = intent.getStringExtra("taps").orEmpty().split(";").filter { it.isNotBlank() }
            .map { it.split(",").let { p -> p[0].toFloat() to p[1].toFloat() } }
        val imageReader = ImageReader.newInstance(w, h, PixelFormat.RGBA_8888, 3)
        reader = imageReader
        imageReader.setOnImageAvailableListener({ r ->
            r.acquireLatestImage()?.use { image ->
                val plane = image.planes[0]
                val padded = plane.rowStride / plane.pixelStride
                val bmp = Bitmap.createBitmap(padded, h, Bitmap.Config.ARGB_8888)
                bmp.copyPixelsFromBuffer(plane.buffer)
                latest = Bitmap.createBitmap(bmp, 0, 0, w, h)
            }
        }, main)
        val p = ScreenProjector(this).also { projector = it }
        p.start(imageReader.surface, w, h, dpi) { CarUi() }
        // Stand in for the car's media sink, so the phone half of the audio path runs for real.
        if (intent.getBooleanExtra("audio", false)) {
            CarAudio.onConsentRequested = {
                runOnUiThread {
                    if (checkSelfPermission(android.Manifest.permission.RECORD_AUDIO) ==
                        android.content.pm.PackageManager.PERMISSION_GRANTED
                    ) {
                        askAudioCapture()
                    } else {
                        audioPermission.launch(android.Manifest.permission.RECORD_AUDIO)
                    }
                }
            }
            CarAudio.attach(BenchAudioSink())
        }
        GearslipLog.i("preview: displayId=${p.displayId}")
        if (intent.getBooleanExtra("hide", false)) p.setOverlayVisible(false)
        intent.getStringExtra("launch")?.let { pkg ->
            main.postDelayed({
                packageManager.getLaunchIntentForPackage(pkg)?.let { p.launchApp(it) }
                    ?: GearslipLog.e("preview: no launch intent for $pkg")
            }, 1500)
        }
        var step = 0
        fun snap() {
            val bmp = latest ?: return GearslipLog.e("preview: no frame yet for step $step")
            val out = File(getExternalFilesDir(null), "preview-$step.png")
            FileOutputStream(out).use { bmp.compress(Bitmap.CompressFormat.PNG, 100, it) }
            GearslipLog.i("preview: wrote ${out.name}")
            step++
        }
        // A two-finger pinch: "cx,cy,startGap,endGap" in projected pixels, after "pinchAfter" ms.
        intent.getStringExtra("pinch")?.let { spec ->
            val (cx, cy, gap0, gap1) = spec.split(",").map { it.toFloat() }
            val pair = { gap: Float -> listOf(TouchPoint(3, cx - gap / 2, cy), TouchPoint(7, cx + gap / 2, cy)) }
            val after = intent.getIntExtra("pinchAfter", 9000).toLong()
            main.postDelayed({
                snap()
                p.dispatchTouch(MotionEvent.ACTION_DOWN, 0, listOf(pair(gap0)[0]))
                p.dispatchTouch(MotionEvent.ACTION_POINTER_DOWN, 1, pair(gap0))
                val steps = 14
                for (i in 1..steps) main.postDelayed({
                    p.dispatchTouch(MotionEvent.ACTION_MOVE, 0, pair(gap0 + (gap1 - gap0) * i / steps))
                }, 40L * i)
                main.postDelayed({
                    p.dispatchTouch(MotionEvent.ACTION_POINTER_UP, 1, pair(gap1))
                    p.dispatchTouch(MotionEvent.ACTION_UP, 0, listOf(pair(gap1)[0]))
                }, 40L * (steps + 1))
                main.postDelayed({ snap() }, 40L * (steps + 1) + 2000)
            }, after)
        }
        // Free-running mode: keep snapshotting on a timer so the display can be driven from
        // outside (adb `am start --display` / `input -d`) while the harness records it.
        val snaps = intent.getIntExtra("snaps", 0)
        if (snaps > 0) {
            val every = intent.getIntExtra("every", 3000).toLong()
            repeat(snaps) { i -> main.postDelayed({ snap() }, 2000L + every * i) }
            return
        }
        main.postDelayed({
            snap()
            taps.forEachIndexed { i, (x, y) ->
                main.postDelayed({
                    val point = listOf(TouchPoint(0, x, y))
                    p.dispatchTouch(MotionEvent.ACTION_DOWN, 0, point)
                    main.postDelayed({ p.dispatchTouch(MotionEvent.ACTION_UP, 0, point) }, 80)
                }, 2500L * (i + 1))
                main.postDelayed({ snap() }, 2500L * (i + 1) + 1500)
            }
        }, 2000)
    }
    override fun onDestroy() {
        super.onDestroy()
        projector?.stop()
        reader?.close()
        CarAudio.onConsentRequested = null
        CarAudio.release()
        CarEnvironment.stop()
    }
 }
@@ -0,0 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Debug-only override of the main icon background (src/debug/res wins over src/main/res),
     so a debug install is never mistaken for a release one on the home screen. -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:pathData="M0,0h108v108h-108z"
        android:fillColor="#f5c518"/>
    <path
        android:pathData="M54,2 A52,52 0 1,1 53.99,2 Z"
        android:fillColor="#e6b400"/>
 </vector>
@@ -0,0 +1,33 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Debug-only override of the main icon foreground, to go with the yellow debug background:
     a charcoal gear rather than light grey, and a yellow centre hole to match the background
     instead of the release icon's near-black. -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path android:pathData="M 66.69,49.48 L 80.91,52.61 L 82.31,42.81 L 66.92,47.91 Z">
        <aapt:attr name="android:fillColor">
            <gradient
                android:type="linear"
                android:startX="66.80"
                android:startY="48.70"
                android:endX="81.61"
                android:endY="47.71">
                <item android:offset="0" android:color="#00E5484D"/>
                <item android:offset="1" android:color="#E5484D"/>
            </gradient>
        </aapt:attr>
    </path>
    <path
        android:pathData="M 54.00,36.18 L 58.64,30.70 L 67.20,34.24 L 66.60,41.40 L 71.82,54.00 L 77.30,58.64 L 73.76,67.20 L 66.60,66.60 L 66.60,66.60 L 67.20,73.76 L 58.64,77.30 L 54.00,71.82 L 54.00,71.82 L 49.36,77.30 L 40.80,73.76 L 41.40,66.60 L 41.40,66.60 L 34.24,67.20 L 30.70,58.64 L 36.18,54.00 L 36.18,54.00 L 30.70,49.36 L 34.24,40.80 L 41.40,41.40 L 41.40,41.40 L 40.80,34.24 L 49.36,30.70 L 54.00,36.18 Z"
        android:fillColor="#2E3033"/>
    <path
        android:pathData="M 78.61,40.70 L 85.31,43.29 L 84.74,52.55 L 77.78,54.31 Z"
        android:fillColor="#E5484D"/>
    <path
        android:pathData="M54,46.08 A7.92,7.92 0 1,1 53.99,46.08 Z"
        android:fillColor="#e6b400"/>
 </vector>
@@ -0,0 +1,226 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <!-- The projected WebView loads real pages; without this every load fails silently. -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!--
      Phone mirroring. Android refuses to hand over a MediaProjection unless a foreground
      service of this type is already running, so MirrorService exists purely to satisfy that
      and to give the driver a way to stop the capture from the notification shade.
    -->
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
    <!-- The dashboard opened from the car clock: today's agenda and current weather. -->
    <uses-permission android:name="android.permission.READ_CALENDAR" />
    <!-- Capturing a media app's playback (to send to the car) is gated on this by the platform. -->
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <!--
        Playback capture copies a stream rather than moving it, so the phone keeps playing the
        music it is sending to the car. Silencing the phone's own speaker for the drive needs this.
    -->
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
    <!--
        Audio capture counts as a screen share, and Android hides notifications during one. The
        protection can be switched off for the drive, but only with this, granted once over adb
        (pm grant). Without it Gearslip works the same and notifications stay hidden.
    -->
    <uses-permission
        android:name="android.permission.WRITE_SECURE_SETTINGS"
        tools:ignore="ProtectedPermissions" />
    <!--
        Phone calls on the car screen. READ_PHONE_STATE and READ_CALL_LOG together are what a
        call's own state (ringing, in progress) and the incoming number need; READ_CONTACTS
        turns that number into a name; ANSWER_PHONE_CALLS lets the driver pick up from here.
        Declining a call, and the caller ID itself, need Gearslip set as the phone's caller ID
        and spam app too - an on-device consent, not a permission declared here.
    -->
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.READ_CALL_LOG" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.ANSWER_PHONE_CALLS" />
    <!-- Placing a call from the car screen's dial pad or contacts list needs this. -->
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <!--
      Declared, not just requested. Templated apps decide whether to talk to a host by asking
      whether it holds this permission (HostValidator.isValidHost checks it before falling back
      to a signature allow-list containing Android Auto's). It is defined by the car framework
      on Android Automotive, which does not exist on a phone, so nothing else defines it here
      and Gearslip has to define it to be able to hold it.
    -->
    <permission
        android:name="android.car.permission.TEMPLATE_RENDERER"
        android:protectionLevel="normal" />
    <uses-permission android:name="android.car.permission.TEMPLATE_RENDERER" />
    <uses-feature android:name="android.hardware.usb.accessory" android:required="true" />
    <queries>
    <!-- Named directly: current builds have no launcher-category entry point for the MAIN/
         LAUNCHER query below to find, so the setup guide's Android Auto check needs this to see
         whether the package is installed at all. -->
    <package android:name="com.google.android.projection.gearhead" />
    <intent>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent>
    <!-- Templated apps are invisible to us without this, and the catalog comes back empty. -->
    <intent>
        <action android:name="androidx.car.app.CarAppService" />
    </intent>
    <!-- Media apps for the car: found by their browser service. -->
    <intent>
        <action android:name="android.media.browse.MediaBrowserService" />
    </intent>
    <!-- Speech: without these, Android hides the recognizer and the voice from us and
         SpeechRecognizer reports none installed even when one is. -->
    <intent>
        <action android:name="android.speech.RecognitionService" />
    </intent>
    <intent>
        <action android:name="android.intent.action.TTS_SERVICE" />
    </intent>
 </queries>
 <application
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:roundIcon="@mipmap/ic_launcher"
        android:label="${appLabel}"
        android:supportsRtl="true"
        android:theme="@style/Theme.Gearslip">
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.logshare"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/share_paths" />
        </provider>
        <!--
          singleTop: the head unit can re-attach while we are already foregrounded, which
          arrives via onNewIntent rather than a fresh instance.
        -->
        <activity
            android:name=".GearslipActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|keyboardHidden|uiMode|density|locale|layoutDirection|fontScale">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!--
          Answers the car's USB connection on GearslipActivity's behalf. Kept apart from the
          activity so Settings can switch off just this (AppSettings.setGearslipEnabled) and leave
          the head unit to Android Auto, without disabling the screen the switch is on.
        -->
        <activity-alias
            android:name=".GearslipUsbAccessory"
            android:targetActivity=".GearslipActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
            </intent-filter>
            <meta-data
                android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
                android:resource="@xml/accessory_filter" />
        </activity-alias>
        <!-- Dev builds' test message: its Reply and Mark as read actions land here. -->
        <receiver
            android:name=".notify.TestMessageReceiver"
            android:exported="false" />
        <service
            android:name=".mirror.MirrorService"
            android:exported="false"
            android:foregroundServiceType="mediaProjection" />
        <service
            android:name=".host.LocationKeepAlive"
            android:exported="false"
            android:foregroundServiceType="location" />
        <!--
          Holds the capture session that carries a media app's audio to the car. It also claims
          the microphone, so voice replies can hear the driver with the phone locked.
        -->
        <service
            android:name=".audio.AudioCaptureService"
            android:exported="false"
            android:foregroundServiceType="mediaProjection|microphone" />
        <!--
          Touch on the car screen is replayed onto the phone through this service.
          dispatchGesture is the only public way for an app to inject input into another app,
          and it is unavailable until the user enables Gearslip under Settings > Accessibility.
        -->
        <service
            android:name=".mirror.TouchRelayService"
            android:exported="true"
            android:label="Gearslip car touch"
            android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
            <intent-filter>
                <action android:name="android.accessibilityservice.AccessibilityService" />
            </intent-filter>
            <meta-data
                android:name="android.accessibilityservice"
                android:resource="@xml/touch_relay" />
        </service>
        <!--
          Reads the phone's notifications so the car can show and answer them. Inert until the
          user grants Notification access to Gearslip in the phone's settings.
        -->
        <service
            android:name=".notify.GearslipNotificationListener"
            android:exported="true"
            android:label="Gearslip notifications"
            android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
            <intent-filter>
                <action android:name="android.service.notification.NotificationListenerService" />
            </intent-filter>
        </service>
        <!--
          Sees incoming calls before they ring, so the car screen can show the caller and
          decline it. Inert until the driver sets Gearslip as the phone's caller ID and spam
          app, under Settings > Apps > Default apps - the same consent a call-blocking app asks
          for, not a privileged one.
        -->
        <service
            android:name=".call.GearslipCallScreening"
            android:exported="true"
            android:label="Gearslip calls"
            android:permission="android.permission.BIND_SCREENING_SERVICE">
            <intent-filter>
                <action android:name="android.telecom.CallScreeningService" />
            </intent-filter>
        </service>
    </application>
 </manifest>
@@ -0,0 +1,36 @@
 # Speech-to-text for voice replies and the assistant: whisper.cpp, pinned to one commit and
 # fetched at build time, so nothing outside this folder (cloned-repos included) is needed.
 cmake_minimum_required(VERSION 3.22)
 project(gearslip_speech CXX C)
 set(CMAKE_CXX_STANDARD 17)
 # Optimised in debug builds too. Unoptimised, Whisper runs several times slower, and a dev build
 # would make voice look far worse than what ships.
 foreach(lang C CXX)
    set(CMAKE_${lang}_FLAGS_DEBUG "-O3 -DNDEBUG")
 endforeach()
 include(FetchContent)
 FetchContent_Declare(
    whisper
    URL https://github.com/ggml-org/whisper.cpp/archive/6e4ab854f67f743900934a703d5603419384c961.tar.gz
    URL_HASH SHA256=55b585aec5e1bc03e2a5cea61da97c6406fa833996cf7daeed704972273cc039
 )
 set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
 set(WHISPER_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
 set(WHISPER_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 set(WHISPER_BUILD_SERVER OFF CACHE BOOL "" FORCE)
 set(GGML_OPENMP OFF CACHE BOOL "" FORCE)
 set(GGML_NATIVE OFF CACHE BOOL "" FORCE)
 # ARMv8.2 with half floats and dot products: every phone that runs Android 12 or later in
 # practice, and what makes Whisper fast enough to answer in under a second.
 set(GGML_CPU_ARM_ARCH "armv8.2-a+dotprod+fp16" CACHE STRING "" FORCE)
 FetchContent_MakeAvailable(whisper)
 add_library(gearslip_speech SHARED speech_jni.cpp)
 target_compile_options(gearslip_speech PRIVATE -O3)
 find_library(LOG_LIB log)
 target_link_libraries(gearslip_speech whisper android ${LOG_LIB})
 target_link_options(gearslip_speech PRIVATE -Wl,--gc-sections -Wl,-z,max-page-size=16384)
@@ -0,0 +1,86 @@
 // The bridge between Kotlin's SpeechEngine and whisper.cpp: load a model, turn one recorded
 // phrase into text, free the model. Recording and deciding when a phrase ends stay in Kotlin.
 #include <jni.h>
 #include <android/asset_manager.h>
 #include <android/asset_manager_jni.h>
 #include <android/log.h>
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include "whisper.h"
 #define TAG "GearslipSpeech"
 #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__)
 static whisper_context_params context_params() {
    whisper_context_params p = whisper_context_default_params();
    p.use_gpu = false;
    return p;
 }
 // Streams a model straight out of the APK, so the bundled one is never copied to storage.
 static size_t asset_read(void *ctx, void *output, size_t size) {
    int n = AAsset_read(static_cast<AAsset *>(ctx), output, size);
    return n > 0 ? static_cast<size_t>(n) : 0;
 }
 static bool asset_eof(void *ctx) { return AAsset_getRemainingLength64(static_cast<AAsset *>(ctx)) <= 0; }
 static void asset_close(void *ctx) { AAsset_close(static_cast<AAsset *>(ctx)); }
 extern "C" JNIEXPORT jlong JNICALL
 Java_app_seb3thehacker_gearslip_speech_SpeechEngine_nativeInitAsset(JNIEnv *env, jobject, jobject assets, jstring jpath) {
    AAssetManager *manager = AAssetManager_fromJava(env, assets);
    const char *path = env->GetStringUTFChars(jpath, nullptr);
    AAsset *asset = AAssetManager_open(manager, path, AASSET_MODE_STREAMING);
    env->ReleaseStringUTFChars(jpath, path);
    if (!asset) return 0;
    whisper_model_loader loader = {asset, asset_read, asset_eof, asset_close};
    return reinterpret_cast<jlong>(whisper_init_with_params(&loader, context_params()));
 }
 // Bytes, not a jstring: NewStringUTF wants modified UTF-8 and aborts on some of what Whisper can
 // write (four-byte characters), so Kotlin decodes the plain UTF-8 instead.
 extern "C" JNIEXPORT jbyteArray JNICALL
 Java_app_seb3thehacker_gearslip_speech_SpeechEngine_nativeTranscribe(
    JNIEnv *env, jobject, jlong handle, jfloatArray jsamples, jstring jlang, jint threads) {
    auto *ctx = reinterpret_cast<whisper_context *>(handle);
    if (!ctx) return env->NewByteArray(0);
    jsize n = env->GetArrayLength(jsamples);
    jfloat *samples = env->GetFloatArrayElements(jsamples, nullptr);
    const char *lang = env->GetStringUTFChars(jlang, nullptr);
    whisper_full_params p = whisper_full_default_params(WHISPER_SAMPLING_GREEDY);
    p.n_threads = threads;
    p.language = lang;
    p.translate = false;
    p.no_context = true;
    p.no_timestamps = true;
    p.single_segment = true;
    p.print_progress = false;
    p.print_realtime = false;
    p.print_special = false;
    p.print_timestamps = false;
    p.suppress_blank = true;
    // The ACFT models are trained for a context cut to the audio's own length (1500 frames is
    // 30 s, so 50 per second), which is what makes a three-second phrase fast. A little extra
    // keeps the last word from being clipped.
    p.audio_ctx = std::min(1500, static_cast<int>(std::ceil(n / 320.0)) + 32);
    int rc = whisper_full(ctx, p, samples, n);
    env->ReleaseStringUTFChars(jlang, lang);
    env->ReleaseFloatArrayElements(jsamples, samples, JNI_ABORT);
    if (rc != 0) {
        LOGI("whisper_full failed: %d", rc);
        return env->NewByteArray(0);
    }
    std::string text;
    for (int i = 0; i < whisper_full_n_segments(ctx); i++) text += whisper_full_get_segment_text(ctx, i);
    jbyteArray out = env->NewByteArray(static_cast<jsize>(text.size()));
    env->SetByteArrayRegion(out, 0, static_cast<jsize>(text.size()), reinterpret_cast<const jbyte *>(text.data()));
    return out;
 }
 extern "C" JNIEXPORT void JNICALL
 Java_app_seb3thehacker_gearslip_speech_SpeechEngine_nativeFree(JNIEnv *, jobject, jlong handle) {
    if (handle) whisper_free(reinterpret_cast<whisper_context *>(handle));
 }
@@ -0,0 +1,97 @@
 package app.seb3thehacker.gearslip
 import android.content.ComponentName
 import android.content.Context
 import android.content.pm.PackageManager
 /** User-facing preferences. Read fresh on every session, so changes apply on the next connect. */
 object AppSettings {
    private const val PREFS = "gearslip_settings"
    private const val KEY_STARTUP_URL = "startup_url"
    private const val KEY_SEEN_COMPAT_WARNING = "seen_compat_warning"
    private const val KEY_SKIPPED_CERT_SETUP = "skipped_cert_setup"
    private const val KEY_SEEN_PERMISSIONS_SETUP = "seen_permissions_setup"
    private const val KEY_GEARSLIP_ENABLED = "gearslip_enabled"
    private fun prefs(context: Context) =
        context.applicationContext.getSharedPreferences(PREFS, Context.MODE_PRIVATE)
    fun getString(context: Context, key: String, default: String): String =
        prefs(context).getString(key, default) ?: default
    fun putString(context: Context, key: String, value: String) {
        prefs(context).edit().putString(key, value).apply()
    }
    /** Blank means "use the built-in test page". */
    fun startupUrl(context: Context): String =
        prefs(context).getString(KEY_STARTUP_URL, "").orEmpty()
    fun setStartupUrl(context: Context, value: String) {
        prefs(context).edit().putString(KEY_STARTUP_URL, value.trim()).apply()
    }
    /** Whether the newer-car compatibility warning has already been shown and dismissed once. */
    fun hasSeenCompatWarning(context: Context): Boolean =
        prefs(context).getBoolean(KEY_SEEN_COMPAT_WARNING, false)
    fun setSeenCompatWarning(context: Context) {
        prefs(context).edit().putBoolean(KEY_SEEN_COMPAT_WARNING, true).apply()
    }
    /** Whether the certificate setup screen has been deliberately skipped. */
    fun hasSkippedCertSetup(context: Context): Boolean =
        prefs(context).getBoolean(KEY_SKIPPED_CERT_SETUP, false)
    fun setSkippedCertSetup(context: Context) {
        prefs(context).edit().putBoolean(KEY_SKIPPED_CERT_SETUP, true).apply()
    }
    /** Whether the one-by-one permissions wizard has already run once. */
    fun hasSeenPermissionsSetup(context: Context): Boolean =
        prefs(context).getBoolean(KEY_SEEN_PERMISSIONS_SETUP, false)
    fun setSeenPermissionsSetup(context: Context) {
        prefs(context).edit().putBoolean(KEY_SEEN_PERMISSIONS_SETUP, true).apply()
    }
    /**
     * Whether Gearslip is allowed to claim the USB accessory connection. Off leaves the app
     * installed but disables the GearslipUsbAccessory alias that answers
     * USB_ACCESSORY_ATTACHED, so a real Android Auto head unit (or Google's own app) gets the
     * connection instead - the two fight over it otherwise, since only one app can win the
     * accessory handoff. The alias is separate from GearslipActivity itself - the activity that
     * shows this very switch - so turning it off can't disable the screen you're looking at.
     * On by default.
     */
    fun gearslipEnabled(context: Context): Boolean =
        prefs(context).getBoolean(KEY_GEARSLIP_ENABLED, true)
    fun setGearslipEnabled(context: Context, value: Boolean) {
        prefs(context).edit().putBoolean(KEY_GEARSLIP_ENABLED, value).apply()
        applyGearslipEnabled(context)
    }
    /**
     * Makes the USB alias match the saved switch. Called at every launch as well, so a switch
     * saved without the alias following it (an older build crashed right there) heals itself.
     * Only the alias changes: the driver's "always open with Gearslip" choice for the car is kept.
     */
    fun applyGearslipEnabled(context: Context) {
        val value = gearslipEnabled(context)
        val appContext = context.applicationContext
        // The class name comes from the code's namespace, not the package: a debug build installs
        // as ".dev", but the alias is still app.seb3thehacker.gearslip.GearslipUsbAccessory.
        val component = ComponentName(appContext.packageName, "${GearslipActivity::class.java.`package`!!.name}.GearslipUsbAccessory")
        val state = if (value) {
            PackageManager.COMPONENT_ENABLED_STATE_DEFAULT
        } else {
            PackageManager.COMPONENT_ENABLED_STATE_DISABLED
        }
        val pm = appContext.packageManager
        if (pm.getComponentEnabledSetting(component) == state) return
        runCatching { pm.setComponentEnabledSetting(component, state, PackageManager.DONT_KILL_APP) }
            .onFailure { GearslipLog.e("could not switch the USB connection ${if (value) "on" else "off"}", it) }
    }
 }
@@ -0,0 +1,52 @@
 package app.seb3thehacker.gearslip
 import java.io.ByteArrayOutputStream
 import java.net.HttpURLConnection
 import java.net.URL
 /**
 * Fetches the publicly available head unit certificate and key from the opencardev/aasdk
 * repository on GitHub. The app ships no certificates; it downloads them only when the
 * user chooses to, the same way a browser would.
 */
 object CertDownloader {
    private val log = GearslipLog.tagged("DOWNL")
    private const val BASE = "https://raw.githubusercontent.com/opencardev/aasdk/main/cert"
    private const val CRT = "$BASE/headunit.crt"
    private const val KEY = "$BASE/headunit.key"
    private const val CONNECT_TIMEOUT_MS = 10_000
    private const val READ_TIMEOUT_MS = 15_000
    class Downloaded(val certificatePem: String, val privateKeyPem: String)
    /** Fetches both files; throws with a readable message on any failure. */
    fun fetch(): Downloaded {
        log.i("fetching certificate from $BASE")
        val crt = fetch(CRT, "certificate")
        val key = fetch(KEY, "private key")
        log.i("downloaded certificate (${crt.length} bytes) and key (${key.length} bytes)")
        return Downloaded(crt, key)
    }
    private fun fetch(url: String, label: String): String {
        val body = try {
            val conn = (URL(url).openConnection() as HttpURLConnection).apply {
                connectTimeout = CONNECT_TIMEOUT_MS
                readTimeout = READ_TIMEOUT_MS
            }
            conn.inputStream.use { input ->
                val out = ByteArrayOutputStream()
                val buf = ByteArray(4096)
                var n: Int
                while (input.read(buf).also { n = it } != -1) out.write(buf, 0, n)
                out.toString(Charsets.UTF_8)
            }
        } catch (e: Exception) {
            throw RuntimeException("could not download the $label: ${e.message}", e)
        }
        if (body.isBlank()) throw RuntimeException("the $label file is empty")
        return body
    }
 }
@@ -0,0 +1,218 @@
 package app.seb3thehacker.gearslip
 import android.content.Context
 import android.net.Uri
 import java.io.ByteArrayOutputStream
 import java.io.File
 import java.security.KeyStore
 import java.security.cert.X509Certificate
 /**
 * Supplies the certificate the phone presents to the head unit.
 *
 * FOSS posture: this code ships with NO certificate. Whoever wants to test the trusted-cert
 * path supplies their own. Sources, in priority order:
 *
 *  1. **Imported** in the app (Settings > Certificate): a PKCS#12 file plus its password,
 *     copied into the app's private storage.
 *  2. **Downloaded** from the public opencardev/aasdk repository. Fetched only when the
 *     user asks; the app never ships or hosts the certificate.
 *  3. **Staged over adb** into the app's external files directory, the way the spike has
 *     always done it. Still honoured, so existing setups keep working untouched:
 *
 *       openssl pkcs12 -export -in headunit.crt -inkey headunit.key \
 *           -name phone -passout pass:aaspike -out phone.p12
 *       adb push phone.p12 /sdcard/Android/data/app.seb3thehacker.gearslip/files/phone.p12
 *
 *     Default password is "aaspike" (kept as-is so an already-staged phone.p12 doesn't need
 *     regenerating); a `phone.pass` file next to it overrides it.
 *  4. A freshly generated self-signed cert, which a real head unit rejects (see
 *     SPIKE_FINDINGS.md).
 */
 object CertProvider {
    private val log = GearslipLog.tagged("CERT")
    private const val P12_NAME = "phone.p12"
    private const val PASS_NAME = "phone.pass"
    private const val DEFAULT_PASSWORD = "aaspike"
    private const val IMPORT_DIR = "identity"
    enum class Kind { IMPORTED, DOWNLOADED, ADB_STAGED, SELF_SIGNED }
    class Identity(
        val keyStore: KeyStore,
        val certificate: X509Certificate,
        val password: CharArray,
        val source: String,
        val kind: Kind = Kind.SELF_SIGNED,
    )
    /** Loaded fresh each call, so a newly imported or pushed cert takes effect on the next connect. */
    fun load(context: Context): Identity = loadFromFiles(context) ?: run {
        val generated = SelfSignedCert.generate()
        Identity(
            generated.keyStore,
            generated.certificate,
            SelfSignedCert.PASSWORD,
            "self-signed (generated) - a real head unit rejects this",
            Kind.SELF_SIGNED,
        )
    }
    /**
     * The active identity without the cost of generating a self-signed key: null means "nothing
     * supplied, a self-signed one would be generated". For the UI, which only wants to describe it.
     */
    fun loadSupplied(context: Context): Identity? = loadFromFiles(context)
    private fun loadFromFiles(context: Context): Identity? {
        val imported = importedFile(context, P12_NAME)
        if (imported.isFile) {
            runCatching {
                return loadP12(imported, importedPassword(context), "imported certificate", Kind.IMPORTED)
            }.onFailure { log.e("could not load the imported certificate - trying the next source", it) }
        }
        val downloaded = downloadedFile(context, P12_NAME)
        if (downloaded.isFile) {
            runCatching {
                return loadP12(downloaded, DEFAULT_PASSWORD, "downloaded certificate", Kind.DOWNLOADED)
            }.onFailure { log.e("could not load the downloaded certificate - trying the next source", it) }
        }
        val dir = context.getExternalFilesDir(null)
        val staged = dir?.let { File(it, P12_NAME) }
        if (dir != null && staged != null && staged.isFile) {
            runCatching {
                val passFile = File(dir, PASS_NAME)
                val password = if (passFile.isFile) {
                    passFile.readText().lineSequence().firstOrNull().orEmpty().trim()
                } else {
                    DEFAULT_PASSWORD
                }
                return loadP12(staged, password, "$P12_NAME staged over adb", Kind.ADB_STAGED)
            }.onFailure { log.e("could not load $P12_NAME - falling back to self-signed", it) }
        }
        return null
    }
    /**
     * Validates [uri] as a PKCS#12 identity with [password] and, only if it is good, makes it
     * the active certificate. A wrong password or a file with no private key throws and
     * leaves whatever was active before untouched.
     */
    fun importFrom(context: Context, uri: Uri, password: String): Identity {
        val bytes = context.contentResolver.openInputStream(uri)?.use { it.readBytes() }
            ?: throw IllegalArgumentException("could not open the selected file")
        val staging = File(context.cacheDir, "import-$P12_NAME")
        try {
            staging.writeBytes(bytes)
            val identity = loadP12(staging, password, "imported certificate", Kind.IMPORTED)
            val target = importedFile(context, P12_NAME)
            target.parentFile?.mkdirs()
            staging.copyTo(target, overwrite = true)
            importedFile(context, PASS_NAME).writeText(password)
            log.i("imported a certificate: ${identity.certificate.subjectX500Principal}")
            return identity
        } finally {
            staging.delete()
        }
    }
    fun hasImported(context: Context): Boolean = importedFile(context, P12_NAME).isFile
    /** Whether a downloaded certificate is stored (may or may not also be imported). */
    fun hasDownloaded(context: Context): Boolean = downloadedFile(context, P12_NAME).isFile
    /** Drops the imported identity; the next source in line (downloaded, adb-staged, then self-signed) takes over. */
    fun removeImported(context: Context) {
        importedFile(context, P12_NAME).delete()
        importedFile(context, PASS_NAME).delete()
        log.i("removed the imported certificate")
    }
    /** Drops the downloaded identity. */
    fun removeDownloaded(context: Context) {
        downloadedFile(context, P12_NAME).delete()
        downloadedFile(context, PASS_NAME).delete()
        log.i("removed the downloaded certificate")
    }
    /** Whether any certificate is available (imported, downloaded, or adb-staged). */
    fun hasAnyCert(context: Context): Boolean =
        hasImported(context) || hasDownloaded(context) || hasAdbStaged(context)
    private fun hasAdbStaged(context: Context): Boolean =
        context.getExternalFilesDir(null)?.let { File(it, P12_NAME).isFile } == true
    /**
     * Validates raw PKCS#12 bytes with [password] and, if good, writes them as the imported
     * identity. Used when the app assembles a certificate in memory (e.g. from a download)
     * rather than importing from a file picker.
     */
    fun importFromBytes(context: Context, p12Bytes: ByteArray, password: String): Identity {
        val staging = File(context.cacheDir, "import-$P12_NAME")
        try {
            staging.writeBytes(p12Bytes)
            val identity = loadP12(staging, password, "imported certificate", Kind.IMPORTED)
            val target = importedFile(context, P12_NAME)
            target.parentFile?.mkdirs()
            staging.copyTo(target, overwrite = true)
            importedFile(context, PASS_NAME).writeText(password)
            log.i("imported a certificate from bytes: ${identity.certificate.subjectX500Principal}")
            return identity
        } finally {
            staging.delete()
        }
    }
    /**
     * Downloads the publicly available head unit certificate from the opencardev/aasdk
     * repository, converts it from PEM to PKCS#12, and stores it ready for use.
     * Runs synchronously (caller is responsible for threading). Throws on any failure.
     */
    fun downloadAndImport(context: Context): Identity {
        val download = CertDownloader.fetch()
        val result = PemKeyParser.build(download.certificatePem, download.privateKeyPem)
        val target = downloadedFile(context, P12_NAME)
        target.parentFile?.mkdirs()
        val p12Password = DEFAULT_PASSWORD
        val keyStore = result.keyStore
        val p12Bytes = ByteArrayOutputStream().use { stream ->
            keyStore.store(stream, p12Password.toCharArray())
            stream.toByteArray()
        }
        target.writeBytes(p12Bytes)
        downloadedFile(context, PASS_NAME).writeText(p12Password)
        log.i("downloaded and stored certificate: ${result.certificate.subjectX500Principal}")
        return Identity(keyStore, result.certificate, p12Password.toCharArray(),
            "downloaded certificate (opencardev/aasdk)", Kind.DOWNLOADED)
    }
    // The imported files live in the app's private internal storage (not the external files
    // dir), so other apps cannot read the key, and `adb uninstall` clearing it is expected.
    private fun importedFile(context: Context, name: String) = File(File(context.filesDir, IMPORT_DIR), name)
    private fun downloadedFile(context: Context, name: String) =
        File(File(context.filesDir, "$IMPORT_DIR-downloaded"), name)
    private fun importedPassword(context: Context): String =
        importedFile(context, PASS_NAME).takeIf { it.isFile }?.readText().orEmpty()
    private fun loadP12(file: File, password: String, label: String, kind: Kind): Identity {
        val chars = password.toCharArray()
        val keyStore = KeyStore.getInstance("PKCS12")
        file.inputStream().use { keyStore.load(it, chars) }
        val alias = keyStore.aliases().asSequence().firstOrNull { keyStore.isKeyEntry(it) }
            ?: throw IllegalStateException("the file contains no private-key entry")
        val certificate = keyStore.getCertificate(alias) as X509Certificate
        return Identity(keyStore, certificate, chars, "$label (alias=$alias)", kind)
    }
 }
@@ -0,0 +1,55 @@
 package app.seb3thehacker.gearslip
 /**
 * What changed in each release, newest first, shown on the car screen after an update (and on
 * the phone). Only the changes a driver would notice. Plain words, short lines: this is read in
 * a parked car.
 */
 object Changelog {
    class Release(val versionCode: Int, val versionName: String, val changes: List<String>)
    val releases = listOf(
        Release(
            7, "0.1.10-alpha",
            listOf(
                "The launcher groups your apps: Phone, Maps, Music, Messaging, Web, Screen sharing, and Settings.",
                "To move an app, press and hold it on the launcher, then tap Move left or Move right.",
                "MapQuest and Flitsmeister work in Gearslip and show the green check.",
                "Spotify has one tile. If Spotify isn't open on the phone, tap Open Spotify to start it.",
                "Flick a map and it glides on, as it does in Android Auto.",
                "The map picks up where it left off when you come back from another screen.",
                "Search boxes in map apps are larger and easier to read.",
                "Map apps keep the right icons on their buttons after they update.",
                "When Gearslip asks \"Do you want to reply?\", a bar shows how long it will listen. The bar stops while you speak.",
                "Gearslip fits its picture to wide car screens and keeps it clear of the edges the car crops.",
                "Gearslip answers the car's connection checks correctly. Some cars, Audis among them, hung up after a second without this.",
                "Google Maps no longer shows up as a messaging app.",
            ),
        ),
        Release(
            6, "0.1.0-alpha",
            listOf(
                "Messaging apps such as Signal and Molly open to your recent chats.",
                "Gearslip reads a message aloud, and you reply by voice. Say \"cancel\" or \"change it\" before it sends, or tap a quick reply such as your arrival time.",
                "Voice works on any phone, GrapheneOS included. Gearslip turns speech into text itself, so it needs no Google account.",
                "New messages show as a small card at the top right, even while you drive. A bar shows how long until the card closes or the reply sends.",
                "Only messages, missed calls, alarms, and reminders pop up. Everything else waits on the dashboard.",
                "The map stays loaded when you switch screens, so it no longer flashes black.",
                "Map apps draw more reliably and keep their connection when the phone is locked.",
                "The Home button shows your map app, so it no longer appears twice.",
                "The next turn shows in the nav bar when you leave the map.",
                "Steering wheel buttons, control knobs, and D-pads now work. If yours don't, open an issue on GitHub.",
                "To see the whole song title and artist in the nav bar, choose Settings > Player in the nav bar > Song title.",
                "Choose miles or kilometres under Settings > Units.",
                "Try the voice assistant and the vehicle data screen under Settings > Experimental features.",
                "Logs now say why a car ended the connection.",
                "Spotify, Waze, and Google Messages updated to a version of Google's car library that only accepts Android Auto itself. Their own car screens won't open in Gearslip. Spotify still plays through the Gearslip player, which has the green check.",
                "Calls go through the car's Bluetooth, as they do in Android Auto. Pair your phone with the car to hear calls on its speakers.",
            ),
        ),
    )
    /** The release that matches this build, if it has notes. */
    val current: Release? get() = releases.firstOrNull { it.versionCode == BuildConfig.VERSION_CODE }
 }
@@ -0,0 +1,97 @@
 package app.seb3thehacker.gearslip
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 /**
 * Proves the H.264 encoder actually produces a bitstream on this device, before a drive.
 *
 * Without this, an unsupported colour format, a rejected Baseline profile, or a null
 * getInputImage() would all present in the car as "the head unit shows nothing" - the same
 * symptom as a protocol fault, and impossible to tell apart from the log. Same reasoning as
 * the TLS self-test: make our own failures loud on the bench.
 */
 object EncoderSelfTest {
    private val log = GearslipLog.tagged("VIDEO")
    fun run(width: Int = 800, height: Int = 480, frameRate: Int = 30): Boolean {
        log.i("=== encoder self-test starting (${width}x$height @ ${frameRate}fps) ===")
        var codecConfig: ByteArray? = null
        var frames = 0
        var sawKeyFrame = false
        var sawResyncKeyFrame = false
        var resyncRequestedAtFrame = -1
        val done = CountDownLatch(1)
        val source = VideoSource(
            width = width,
            height = height,
            frameRate = frameRate,
            onCodecConfig = { codecConfig = it },
            onFrame = { _, _, keyFrame ->
                frames++
                if (keyFrame) sawKeyFrame = true
                // At frame 5, ask for a resync keyframe - the same call sendVideoFrame makes
                // after a drop - and confirm THIS encoder actually honours it. Trusting an
                // API we have never exercised on this device is exactly the mistake that
                // cost two drives already (the CONTROL message-type bit, the touch scaling).
                if (frames == 5) {
                    resyncRequestedAtFrame = frames
                }
                if (resyncRequestedAtFrame in 1 until frames && keyFrame) {
                    sawResyncKeyFrame = true
                }
                if (frames >= 12) done.countDown()
            },
        )
        return try {
            source.start()
            // Give it a couple of frames before requesting resync, matching how it is used
            // for real: the request always follows at least one already-encoded frame.
            Thread {
                while (resyncRequestedAtFrame == -1) Thread.sleep(20)
                source.requestSyncFrame()
            }.apply { isDaemon = true; start() }
            done.await(8, TimeUnit.SECONDS)
            source.stop()
            val csd = codecConfig
            when {
                csd == null -> {
                    log.e("encoder self-test FAILED: no CODEC_CONFIG (SPS/PPS) produced")
                    false
                }
                frames == 0 -> {
                    log.e("encoder self-test FAILED: no frames produced")
                    false
                }
                !sawKeyFrame -> {
                    log.e("encoder self-test FAILED: no keyframe - the car needs one first")
                    false
                }
                !sawResyncKeyFrame -> {
                    log.e(
                        "encoder self-test FAILED: requestSyncFrame() produced no keyframe - " +
                            "the resync-after-drop fix would silently do nothing on this device",
                    )
                    false
                }
                else -> {
                    log.i(
                        "SPS/PPS = ${csd.size} bytes, $frames frames, keyframe present, " +
                            "requestSyncFrame() confirmed working",
                    )
                    log.hex("   csd", csd, limit = 48)
                    log.i("=== encoder self-test PASSED ===")
                    true
                }
            }
        } catch (t: Throwable) {
            runCatching { source.stop() }
            log.e("encoder self-test FAILED with an exception", t)
            false
        }
    }
 }
@@ -0,0 +1,135 @@
 package app.seb3thehacker.gearslip
 import java.io.ByteArrayOutputStream
 /**
 * Android Auto frame layout, transcribed from aasdk.
 *
 * FrameHeader::getData (src/Messenger/FrameHeader.cpp:47-55),
 * FrameSize::getData (src/Messenger/FrameSize.cpp:49-62) and
 * MessageOutStream::compoundFrame (src/Messenger/MessageOutStream.cpp:100-120):
 *
 *   byte 0     channel id
 *   byte 1     frameType | encryption | messageType
 *   bytes 2-3  uint16 BE  payload length of THIS frame
 *   bytes 4-7  uint32 BE  total message length - present ONLY when frameType == FIRST
 *   payload    uint16 BE message id, then the body
 */
 object Frames {
    const val CHANNEL_CONTROL = 0
    const val TYPE_MIDDLE = 0
    const val TYPE_FIRST = 1
    const val TYPE_LAST = 2
    const val TYPE_BULK = 3
    const val ENCRYPTED = 1 shl 3
    /**
     * Message type bit. Channel-open messages are CONTROL even when sent on a service
     * channel - aasdk sets MessageType::CONTROL only in sendChannelOpenResponse and
     * MessageType::SPECIFIC everywhere else (e.g.
     * src/Channel/MediaSink/Video/VideoMediaSinkService.cpp:52 vs :66). Getting this wrong
     * makes the head unit drop the USB link outright rather than answer.
     */
    const val MESSAGE_SPECIFIC = 0
    const val MESSAGE_CONTROL = 1 shl 2
    /** aasdk splits at this size (MessageOutStream.hpp:62). Nothing the spike sends is close. */
    const val MAX_FRAME_PAYLOAD = 0x4000
    class Frame(
        val channel: Int,
        val frameType: Int,
        val encrypted: Boolean,
        val messageType: Int,
        val payload: ByteArray,
    )
    /**
     * Builds one frame. [totalSize] is the full plaintext message length and is written only
     * for FIRST frames, matching aasdk's MessageOutStream::setFrameSize
     * (`FrameSize(payloadSize, totalSize)` for FIRST, `FrameSize(payloadSize)` otherwise).
     */
    fun build(
        channel: Int,
        encrypted: Boolean,
        payload: ByteArray,
        messageType: Int = MESSAGE_SPECIFIC,
        frameType: Int = TYPE_BULK,
        totalSize: Int? = null,
    ): ByteArray {
        val flags = frameType or messageType or (if (encrypted) ENCRYPTED else 0)
        val header = byteArrayOf(
            channel.toByte(),
            flags.toByte(),
            ((payload.size shr 8) and 0xFF).toByte(),
            (payload.size and 0xFF).toByte(),
        )
        if (frameType != TYPE_FIRST || totalSize == null) return header + payload
        val extended = byteArrayOf(
            ((totalSize shr 24) and 0xFF).toByte(),
            ((totalSize shr 16) and 0xFF).toByte(),
            ((totalSize shr 8) and 0xFF).toByte(),
            (totalSize and 0xFF).toByte(),
        )
        return header + extended + payload
    }
    /**
     * Pulls whole frames out of an accumulating buffer.
     *
     * A read() on the accessory descriptor returns one bulk transfer, which is usually one
     * frame - but nothing guarantees it, so this never assumes alignment.
     */
    class Parser {
        private var pending = ByteArray(0)
        fun append(data: ByteArray, length: Int) {
            val grown = ByteArray(pending.size + length)
            System.arraycopy(pending, 0, grown, 0, pending.size)
            System.arraycopy(data, 0, grown, pending.size, length)
            pending = grown
        }
        fun next(): Frame? {
            if (pending.size < 4) return null
            val channel = pending[0].toInt() and 0xFF
            val flags = pending[1].toInt() and 0xFF
            val frameType = flags and TYPE_BULK
            // Extended size is written only for FIRST - BULK (3) keeps the short header.
            val headerLength = if (frameType == TYPE_FIRST) 8 else 4
            if (pending.size < headerLength) return null
            val frameSize = ((pending[2].toInt() and 0xFF) shl 8) or (pending[3].toInt() and 0xFF)
            val total = headerLength + frameSize
            if (pending.size < total) return null
            val payload = pending.copyOfRange(headerLength, total)
            pending = pending.copyOfRange(total, pending.size)
            return Frame(
                channel, frameType, (flags and ENCRYPTED) != 0, flags and MESSAGE_CONTROL, payload,
            )
        }
    }
    /** Rejoins FIRST/MIDDLE/LAST runs. Payloads arrive already decrypted. */
    class Assembler {
        private val partial = HashMap<Int, ByteArrayOutputStream>()
        fun offer(frame: Frame, payload: ByteArray): ByteArray? = when (frame.frameType) {
            TYPE_BULK -> payload
            TYPE_FIRST -> {
                partial[frame.channel] = ByteArrayOutputStream().apply { write(payload) }
                null
            }
            TYPE_MIDDLE -> {
                partial[frame.channel]?.write(payload)
                null
            }
            TYPE_LAST -> partial.remove(frame.channel)?.apply { write(payload) }?.toByteArray()
            else -> null
        }
    }
 }
@@ -0,0 +1,343 @@
 package app.seb3thehacker.gearslip
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.hardware.usb.UsbAccessory
 import android.hardware.usb.UsbManager
 import android.media.projection.MediaProjection
 import android.media.projection.MediaProjectionManager
 import android.os.Bundle
 import android.os.ParcelFileDescriptor
 import android.view.MotionEvent
 import android.view.Surface
 import android.view.WindowManager
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
 import android.content.res.Configuration
 import app.seb3thehacker.gearslip.audio.AudioCaptureService
 import app.seb3thehacker.gearslip.audio.CarAudio
 import app.seb3thehacker.gearslip.mirror.MirrorService
 import app.seb3thehacker.gearslip.mirror.PhoneMirror
 import app.seb3thehacker.gearslip.mirror.TouchRelayService
 import app.seb3thehacker.gearslip.car.CarEnvironment
 import app.seb3thehacker.gearslip.car.CarSettings
 import app.seb3thehacker.gearslip.car.CarUi
 import app.seb3thehacker.gearslip.car.Prefetch
 import app.seb3thehacker.gearslip.ui.GearslipApp
 import app.seb3thehacker.gearslip.ui.GearslipTheme
 import java.io.FileInputStream
 import java.io.FileOutputStream
 /**
 * Hosts the phone UI and, for now, the car session itself.
 *
 * Launched by the system when the head unit switches the phone into accessory mode. The
 * session lives in this activity, so [android:configChanges] in the manifest keeps a
 * rotation or theme change from recreating it and dropping the connection.
 */
 class GearslipActivity : ComponentActivity(), Projection {
    private var descriptor: ParcelFileDescriptor? = null
    private var runner: GearslipRunner? = null
    private var screenProjector: ScreenProjector? = null
    private var worker: Thread? = null
    /** The encoder's input Surface, kept so the car's picture can be switched to the mirror. */
    private var surface: Surface? = null
    private var frameWidth = 0
    private var frameHeight = 0
    private var frameDensity = 0
    /**
     * Screen capture always begins with a consent dialog, which only an activity can show -
     * so the car UI asks, and the request surfaces here on the phone.
     */
    private val captureConsent = registerForActivityResult(StartActivityForResult()) { result ->
        val data = result.data
        if (result.resultCode == RESULT_OK && data != null) {
            MirrorService.start(this, result.resultCode, data)
        } else {
            GearslipLog.w("screen capture consent declined")
        }
    }
    /** Media audio needs the microphone permission (a platform rule for playback capture) first. */
    private val audioPermission = registerForActivityResult(
        androidx.activity.result.contract.ActivityResultContracts.RequestPermission(),
    ) { granted ->
        if (granted) askAudioCapture() else {
            GearslipLog.w("audio: record permission declined")
            CarAudio.denied()
        }
    }
    private val audioConsent = registerForActivityResult(StartActivityForResult()) { result ->
        val data = result.data
        if (result.resultCode == RESULT_OK && data != null) {
            AudioCaptureService.start(this, result.resultCode, data)
        } else {
            GearslipLog.w("audio: capture consent declined")
            CarAudio.denied()
        }
    }
    private val detachReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            if (intent?.action == UsbManager.ACTION_USB_ACCESSORY_DETACHED) {
                GearslipLog.w("accessory detached")
                closeAccessory()
            }
        }
    }
    /** Setting Gearslip as the phone's caller ID and spam app - what lets it decline a ringing call. */
    private val callScreeningRole = registerForActivityResult(StartActivityForResult()) { result ->
        if (result.resultCode != RESULT_OK) GearslipLog.w("calls: call screening role declined")
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // Location, calendar, the phone/contacts group, and the microphone are asked for one at
        // a time by PermissionsSetupScreen instead of here, each only after the driver taps
        // Allow on a screen explaining what it is for. Firing them all from onCreate, unprompted,
        // is both a bad first impression and unreliable: Android does not consistently show more
        // than one system permission dialog fired back-to-back, which was silently dropping some.
        enableEdgeToEdge()
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
        GearslipLog.init(this)
        GearslipLog.installCrashHandler()
        GearslipLog.i("Gearslip ready")
        CarSettings.init(this)
        AppSettings.applyGearslipEnabled(this)
        // A capture that died without tidying up would leave notifications exposed to every
        // later screen share. Nothing is capturing if the service is not running, so undo it.
        if (!app.seb3thehacker.gearslip.audio.AudioCaptureService.running) {
            app.seb3thehacker.gearslip.audio.ScreenShareGuard.restore(this)
        }
        Prefetch.warm(this)
        CarEnvironment.setPhoneTheme(resources.configuration)
        setContent {
            GearslipTheme {
                GearslipApp(onDisconnect = ::closeAccessory, onRequestCallScreening = ::requestCallScreeningRole)
            }
        }
        PhoneMirror.onStartRequested = { runOnUiThread { requestCapture() } }
        PhoneMirror.onTokenReady = { token -> runOnUiThread { showMirror(token) } }
        PhoneMirror.onEnded = { runOnUiThread { showCarUi() } }
        CarAudio.onConsentRequested = { runOnUiThread { requestAudioCapture() } }
        registerReceiver(detachReceiver, IntentFilter(UsbManager.ACTION_USB_ACCESSORY_DETACHED), RECEIVER_NOT_EXPORTED)
        handleIntent(intent)
    }
    // The manifest opts out of recreation on uiMode changes, so a light/dark switch on the phone
    // arrives here, and the car UI follows it.
    override fun onConfigurationChanged(newConfig: Configuration) {
        super.onConfigurationChanged(newConfig)
        CarEnvironment.setPhoneTheme(newConfig)
    }
    // Throttled inside Prefetch, so this only does work if the last run was a while ago.
    override fun onStart() {
        super.onStart()
        Prefetch.warm(this)
    }
    override fun onNewIntent(intent: Intent) {
        super.onNewIntent(intent)
        handleIntent(intent)
    }
    override fun onDestroy() {
        super.onDestroy()
        runCatching { unregisterReceiver(detachReceiver) }
        PhoneMirror.onStartRequested = null
        PhoneMirror.onTokenReady = null
        PhoneMirror.onEnded = null
        CarAudio.onConsentRequested = null
        CarAudio.release()
        PhoneMirror.requestStop()
        closeAccessory()
        GearslipLog.flush()
    }
    /** Launches the system dialog that offers Gearslip the call-screening role, if it isn't held already. */
    private fun requestCallScreeningRole() {
        val roleManager = getSystemService(android.app.role.RoleManager::class.java)
        if (roleManager == null || !roleManager.isRoleAvailable(android.app.role.RoleManager.ROLE_CALL_SCREENING)) {
            GearslipLog.w("calls: call screening role unavailable on this phone")
            return
        }
        if (roleManager.isRoleHeld(android.app.role.RoleManager.ROLE_CALL_SCREENING)) return
        runCatching {
            callScreeningRole.launch(roleManager.createRequestRoleIntent(android.app.role.RoleManager.ROLE_CALL_SCREENING))
        }.onFailure { GearslipLog.e("could not ask for the call screening role", it) }
    }
    // --- Media audio --------------------------------------------------------------------
    private fun requestAudioCapture() {
        if (checkSelfPermission(android.Manifest.permission.RECORD_AUDIO) == android.content.pm.PackageManager.PERMISSION_GRANTED) {
            askAudioCapture()
        } else {
            audioPermission.launch(android.Manifest.permission.RECORD_AUDIO)
        }
    }
    private fun askAudioCapture() {
        val manager = getSystemService(MediaProjectionManager::class.java)
        runCatching { audioConsent.launch(manager.createScreenCaptureIntent()) }
            .onFailure {
                GearslipLog.e("could not ask for audio capture", it)
                CarAudio.denied()
            }
    }
    // --- Phone mirroring ----------------------------------------------------------------
    private fun requestCapture() {
        val manager = getSystemService(MediaProjectionManager::class.java)
        runCatching { captureConsent.launch(manager.createScreenCaptureIntent()) }
            .onFailure { GearslipLog.e("could not ask for screen capture", it) }
    }
    /** A Surface has a single producer, so our own display must go before the mirror arrives. */
    private fun showMirror(token: MediaProjection) {
        val target = surface ?: return
        screenProjector?.stop()
        screenProjector = null
        PhoneMirror.begin(token, target, frameWidth, frameHeight, frameDensity)
        if (PhoneMirror.active.value) PhoneMirror.launchPending(this) else showCarUi()
    }
    private fun showCarUi() {
        val target = surface ?: return
        if (screenProjector != null) return
        val projector = ScreenProjector(this).also { screenProjector = it }
        projector.start(target, frameWidth, frameHeight, frameDensity) { CarUi() }
    }
    /**
     * Sends a head-unit touch to the phone. Anything landing on the mirror's letterbox padding
     * maps to nothing on the phone and is dropped rather than clamped onto a screen edge.
     */
    private fun relayTouch(action: Int, x: Float, y: Float) {
        val point = PhoneMirror.mapToPhone(this, x, y)
        if (point == null) {
            // The letterbox bars belong to no window, which makes them a safe way back: a tap
            // on the padding leaves the mirror and returns the car to Gearslip's own UI.
            if (action == MotionEvent.ACTION_UP) PhoneMirror.requestStop()
            return
        }
        val relay = TouchRelayService.instance ?: return
        when (action) {
            MotionEvent.ACTION_DOWN -> relay.down(point.x, point.y)
            MotionEvent.ACTION_MOVE -> relay.move(point.x, point.y)
            MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> relay.up(point.x, point.y)
        }
    }
    private fun handleIntent(intent: Intent?) {
        if (intent?.action != UsbManager.ACTION_USB_ACCESSORY_ATTACHED) return
        // Switched off in Settings: the system shouldn't route the car here at all, but if it
        // does, leave the accessory alone.
        if (!AppSettings.gearslipEnabled(this)) {
            GearslipLog.i("accessory attached, but Gearslip is switched off - not connecting")
            return
        }
        val accessory = intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY, UsbAccessory::class.java)
        if (accessory == null) {
            GearslipLog.e("attach intent carried no accessory")
            SessionStatus.failed("Accessory missing", "The system reported a USB attach but did not include the accessory.")
            return
        }
        GearslipLog.i("accessory attached by the system - permission is implicit on this path")
        start(accessory)
    }
    private fun start(accessory: UsbAccessory) {
        // A fresh ATTACHED intent means the system wants a new session, whatever state the old
        // one is in - closing first guarantees openAccessory() below never fights a descriptor
        // this same process forgot to release. The old worker thread often isn't alive by this
        // point anyway (its read loop already died when the head unit dropped the transport),
        // but the accessory it opened was never explicitly closed, which is what actually blocks
        // a re-open - a dead thread does not release the file descriptor on its own.
        closeAccessory()
        describe(accessory)
        val manager = getSystemService(UsbManager::class.java)
        val pfd = manager.openAccessory(accessory)
        if (pfd == null) {
            GearslipLog.e("openAccessory returned null - the session was claimed by someone else")
            SessionStatus.failed("Accessory unavailable", "Another app claimed the USB accessory before Gearslip could open it.")
            return
        }
        descriptor = pfd
        val runner = GearslipRunner(
            input = FileInputStream(pfd.fileDescriptor),
            output = FileOutputStream(pfd.fileDescriptor),
            identityProvider = { CertProvider.load(this) },
            projection = this,
            vehicleProfileFor = { info -> VehicleProfiles.find(VehicleProfiles.load(this), info) },
        )
        this.runner = runner
        worker = Thread { runner.run() }.apply { name = "gearslip"; start() }
    }
    private fun describe(accessory: UsbAccessory) {
        GearslipLog.i("accessory: manufacturer=${accessory.manufacturer} model=${accessory.model}")
        GearslipLog.i("           version=${accessory.version} description=${accessory.description}")
    }
    private fun closeAccessory() {
        runner?.stop()
        SessionReport.print()
        runCatching { descriptor?.close() }
        descriptor = null
        runner = null
    }
    // --- Projection ---------------------------------------------------------------------
    override fun onSurfaceReady(surface: Surface, width: Int, height: Int, densityDpi: Int) {
        runOnUiThread {
            this.surface = surface
            frameWidth = width
            frameHeight = height
            frameDensity = densityDpi
            CarEnvironment.setDisplay(width, height, densityDpi)
            CarEnvironment.start(this)
            showCarUi()
            app.seb3thehacker.gearslip.car.CarKeys.focusSink = { code, down ->
                runOnUiThread { screenProjector?.dispatchKey(code, down) }
            }
        }
    }
    override fun onTouch(action: Int, actionIndex: Int, points: List<TouchPoint>) {
        runOnUiThread {
            // Mirroring drives one phone touch at a time, so it follows the first finger only.
            if (PhoneMirror.active.value) points.firstOrNull()?.let { relayTouch(action, it.x, it.y) }
            else screenProjector?.dispatchTouch(action, actionIndex, points)
        }
    }
    override fun onProjectionStopped() {
        runOnUiThread {
            PhoneMirror.requestStop()
            app.seb3thehacker.gearslip.car.CarKeys.focusSink = null
            screenProjector?.stop()
            screenProjector = null
            surface = null
            CarEnvironment.stop()
        }
    }
 }
@@ -0,0 +1,197 @@
 package app.seb3thehacker.gearslip
 import android.content.Context
 import android.util.Log
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
 /**
 * Logs to logcat and to a file at once.
 *
 * The file copy is the safety net: entering USB accessory mode tears down adb-over-USB, so
 * if wireless adb drops in the car the file is the only surviving record of the run. It
 * lives under getExternalFilesDir, which `adb pull` can reach without root.
 */
 object GearslipLog {
    const val TAG = "Gearslip"
    private val stamp = SimpleDateFormat("HH:mm:ss.SSS", Locale.US)
    private val io = Executors.newSingleThreadExecutor()
    private const val MAX_LIVE_LINES = 3000
    private var file: File? = null
    /**
     * Off drops the noisy trace output (hex dumps, and logcat copies of info lines); warnings,
     * errors and the file copy are always kept, so a crash report is never empty. Always on for
     * now, while the project is pre-release.
     */
    @Volatile var debug = true
    // What the live log screen shows. Bounded, and separate from the file, which always keeps
    // everything. The flow carries only a version number so a burst of lines costs the UI one
    // snapshot per frame rather than one list copy per line.
    private val live = ArrayDeque<String>()
    private val liveVersion = MutableStateFlow(0)
    val version: StateFlow<Int> = liveVersion
    fun init(context: Context) {
        val dir = context.getExternalFilesDir(null) ?: return
        val name = SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US).format(Date())
        file = File(dir, "gearslip-$name.log")
        i("log file: ${file?.absolutePath}")
        SessionReport.init(context)
    }
    fun snapshot(): List<String> = synchronized(live) { live.toList() }
    /** Clears the live view only. The log file on disk is left alone. */
    fun clearLive() {
        synchronized(live) { live.clear() }
        liveVersion.update { it + 1 }
    }
    /** The whole current session's file, for sharing. Falls back to the live buffer. */
    fun fullText(): String {
        flush()
        val f = file
        return if (f != null && f.isFile) f.readText() else snapshot().joinToString("\n")
    }
    /**
     * The current session's log, with the session report on top, copied to the cache dir for
     * sharing as an attachment (a whole log can exceed what an Intent may carry as text).
     */
    fun shareableFile(context: Context): android.net.Uri {
        val dir = File(context.cacheDir, "shared").apply { mkdirs() }
        dir.listFiles()?.forEach { it.delete() }
        val out = File(dir, "gearslip-log.txt")
        out.writeText(SessionReport.render() + "\n\n" + fullText())
        return androidx.core.content.FileProvider.getUriForFile(
            context, "${context.packageName}.logshare", out,
        )
    }
    fun i(message: String, tag: String = "APP") = write("I", message, tag)
    fun w(message: String, tag: String = "APP") = write("W", message, tag)
    /** Logs the message, then the exception with its cause chain and top stack frames. */
    fun e(message: String, t: Throwable? = null, tag: String = "APP") {
        write("E", if (t == null) message else "$message: ${rootCause(t)}", tag)
        if (t != null) {
            Log.e(TAG, message, t)
            stackTrace(t).lines().forEach { write("E", "    $it", tag) }
        }
    }
    /** A logger that stamps every line with [tag], so the log can be scanned by subsystem. */
    fun tagged(tag: String) = Tagged(tag)
    class Tagged(private val tag: String) {
        fun i(message: String) = GearslipLog.i(message, tag)
        fun w(message: String) = GearslipLog.w(message, tag)
        fun e(message: String, t: Throwable? = null) = GearslipLog.e(message, t, tag)
        fun hex(label: String, data: ByteArray, limit: Int = 256) = GearslipLog.hex(label, data, limit, tag)
        fun verdict(headline: String, detail: String) = GearslipLog.verdict(headline, detail)
        fun flush() = GearslipLog.flush()
    }
    /** "SSLHandshakeException: Received fatal alert: bad_certificate" - the deepest cause wins. */
    fun rootCause(t: Throwable): String {
        var cause: Throwable = t
        while (cause.cause != null && cause.cause !== cause) cause = cause.cause!!
        val top = "${t.javaClass.simpleName}: ${t.message}"
        return if (cause === t) top else "$top <- ${cause.javaClass.simpleName}: ${cause.message}"
    }
    private fun stackTrace(t: Throwable, frames: Int = 12): String {
        val out = StringBuilder()
        var cause: Throwable? = t
        var depth = 0
        while (cause != null && depth < 4) {
            if (depth > 0) out.append("caused by ${cause.javaClass.name}: ${cause.message}\n")
            cause.stackTrace.take(frames).forEach { out.append("at $it\n") }
            cause = cause.cause?.takeIf { it !== cause }
            depth++
        }
        return out.toString().trimEnd()
    }
    /**
     * Records an uncaught exception in the log file before the process dies, then lets the
     * system's own handler run. Without it the file ends mid-sentence and the reason is lost.
     */
    fun installCrashHandler() {
        val previous = Thread.getDefaultUncaughtExceptionHandler()
        Thread.setDefaultUncaughtExceptionHandler { thread, throwable ->
            runCatching {
                SessionReport.fail(SessionReport.Category.CRASH, "uncaught in thread ${thread.name}", throwable)
                e("FATAL uncaught exception in thread ${thread.name}", throwable)
                SessionReport.print()
                flush()
            }
            previous?.uncaughtException(thread, throwable)
        }
    }
    /** Unmissable in a scrolling logcat - this is what the whole spike exists to print. */
    fun verdict(headline: String, detail: String) {
        val bar = "=".repeat(60)
        i(bar)
        i("VERDICT: $headline")
        i(detail)
        i(bar)
        // The verdict is the one line the run exists to produce, and the app may be killed
        // the moment the accessory detaches. Do not leave it sitting in the write queue.
        flush()
    }
    /** Blocks until everything queued has actually reached the file. */
    fun flush(timeoutMs: Long = 2_000) {
        val latch = CountDownLatch(1)
        runCatching { io.execute { latch.countDown() } }.onFailure { return }
        runCatching { latch.await(timeoutMs, TimeUnit.MILLISECONDS) }
    }
    fun hex(label: String, data: ByteArray, limit: Int = 256, tag: String = "APP") {
        if (!debug) return
        val shown = minOf(data.size, limit)
        val sb = StringBuilder()
        for (idx in 0 until shown) {
            sb.append(String.format("%02X", data[idx]))
            if (idx % 16 == 15) sb.append('\n') else sb.append(' ')
        }
        val suffix = if (data.size > limit) "\n... (${data.size - limit} more bytes)" else ""
        i("$label (${data.size} bytes)\n$sb$suffix", tag)
    }
    private fun write(level: String, message: String, tag: String = "APP") {
        when (level) {
            "W" -> Log.w(TAG, message)
            "E" -> Log.e(TAG, message)
            else -> if (debug) Log.i(TAG, message)
        }
        val line = "${stamp.format(Date())} $level ${tag.padEnd(5)} $message"
        synchronized(live) {
            live.addLast(line)
            while (live.size > MAX_LIVE_LINES) live.removeFirst()
        }
        liveVersion.update { it + 1 }
        val target = file ?: return
        io.execute {
            runCatching { target.appendText(line + "\n") }
        }
    }
 }
@@ -0,0 +1,125 @@
 package app.seb3thehacker.gearslip
 import java.io.ByteArrayInputStream
 import java.math.BigInteger
 import java.security.KeyFactory
 import java.security.KeyStore
 import java.security.cert.CertificateFactory
 import java.security.cert.X509Certificate
 import java.security.spec.RSAPrivateCrtKeySpec
 import java.security.spec.RSAPublicKeySpec
 /**
 * Converts a PEM-encoded X.509 certificate and PEM-encoded RSA PKCS#1 private key into a
 * PKCS#12 [KeyStore], using only standard JCA APIs — no BouncyCastle.
 *
 * The DER parsing of the PKCS#1 key is done by hand (matching the same approach used in
 * [SelfSignedCert] for writing). Android's Conscrypt [KeyFactory] only accepts PKCS#8,
 * so we translate PKCS#1 → [RSAPrivateCrtKeySpec] ourselves.
 */
 object PemKeyParser {
    private const val CERT_HEADER = "-----BEGIN CERTIFICATE-----"
    private const val CERT_FOOTER = "-----END CERTIFICATE-----"
    private const val KEY_HEADER = "-----BEGIN RSA PRIVATE KEY-----"
    private const val KEY_FOOTER = "-----END RSA PRIVATE KEY-----"
    class Result(val keyStore: KeyStore, val certificate: X509Certificate)
    /**
     * Parses PEM strings for the certificate and private key, verifies they match, and
     * returns a PKCS#12 [KeyStore] ready for [CertProvider] to consume.
     */
    fun build(certificatePem: String, privateKeyPem: String, alias: String = "phone"): Result {
        val cert = parseCertificate(certificatePem)
        val keySpec = parsePrivateKey(privateKeyPem)
        val kf = KeyFactory.getInstance("RSA")
        val pubSpec = RSAPublicKeySpec(keySpec.spec.modulus, keySpec.spec.publicExponent)
        require(kf.generatePublic(pubSpec) == cert.publicKey) {
            "the certificate's public key does not match the private key"
        }
        val keyStore = KeyStore.getInstance("PKCS12").apply {
            load(null, null)
            setKeyEntry(alias, keySpec.getPrivate(), CharArray(0), arrayOf(cert))
        }
        return Result(keyStore, cert)
    }
    /** Strips PEM headers/footers and decodes the base64 body. */
    fun parseCertificate(pem: String): X509Certificate {
        val der = pemToDer(pem, CERT_HEADER, CERT_FOOTER)
        return CertificateFactory.getInstance("X.509")
            .generateCertificate(ByteArrayInputStream(der)) as X509Certificate
    }
    /** Parses an RSA PKCS#1 private key (ASN.1 DER) into a key spec. */
    fun parsePrivateKey(pem: String): KeySpec {
        val der = pemToDer(pem, KEY_HEADER, KEY_FOOTER)
        val integers = readPkcs1Sequence(der)
        require(integers.size == 9) { "PKCS#1 RSA key needs 9 integers, got ${integers.size}" }
        val spec = RSAPrivateCrtKeySpec(integers[1], integers[2], integers[3], integers[4], integers[5], integers[6], integers[7], integers[8])
        val privateKey = KeyFactory.getInstance("RSA").generatePrivate(spec)
        return KeySpec(spec, privateKey)
    }
    /** Holds both the spec and the constructed key for matching against a certificate's public key. */
    class KeySpec(val spec: RSAPrivateCrtKeySpec, private val privateKey: java.security.PrivateKey) {
        fun getPrivate() = privateKey
    }
    /** Strips headers and decodes base64. */
    private fun pemToDer(pem: String, header: String, footer: String): ByteArray {
        val start = pem.indexOf(header)
        val end = pem.indexOf(footer)
        if (start == -1 || end == -1 || end <= start) {
            throw IllegalArgumentException("not a valid PEM $header block")
        }
        val b64 = pem.substring(start + header.length, end)
            .replace(Regex("\\s+"), "")
        return java.util.Base64.getDecoder().decode(b64)
    }
    /**
     * Parses the inner SEQUENCE of an RSA PKCS#1 DER blob into a list of [BigInteger]s.
     * Throws if the ASN.1 structure is wrong, so caller gets a clear error rather than a
     * silent wrong key.
     */
    private fun readPkcs1Sequence(der: ByteArray): List<BigInteger> {
        var pos = 0
        fun readTag(): Int {
            require(pos < der.size) { "unexpected end of DER at tag" }
            return der[pos++].toInt() and 0xFF
        }
        fun readLength(): Int {
            require(pos < der.size) { "unexpected end of DER at length" }
            val b0 = der[pos++].toInt() and 0xFF
            if (b0 < 0x80) return b0
            val numBytes = b0 and 0x7F
            require(pos + numBytes <= der.size) { "truncated long-form length" }
            var result = 0
            repeat(numBytes) {
                result = (result shl 8) or (der[pos++].toInt() and 0xFF)
            }
            return result
        }
        val outerTag = readTag()
        require(outerTag == 0x30) { "expected SEQUENCE (0x30), got 0x${outerTag.toString(16)}" }
        val outerLen = readLength()
        require(pos + outerLen <= der.size) { "SEQUENCE length $outerLen exceeds remaining data" }
        val integers = mutableListOf<BigInteger>()
        while (pos < der.size) {
            val tag = readTag()
            require(tag == 0x02) { "expected INTEGER (0x02), got 0x${tag.toString(16)} at offset ${pos - 1}" }
            val len = readLength()
            require(pos + len <= der.size) { "INTEGER length $len exceeds remaining data" }
            integers.add(BigInteger(der.copyOfRange(pos, pos + len)))
            pos += len
        }
        require(integers.size == 9) { "PKCS#1 RSA key needs 9 integers, got ${integers.size}" }
        return integers
    }
 }
@@ -0,0 +1,223 @@
 package app.seb3thehacker.gearslip
 import java.net.Socket
 import java.nio.ByteBuffer
 import java.security.KeyStore
 import java.security.SecureRandom
 import java.security.cert.X509Certificate
 import javax.net.ssl.KeyManagerFactory
 import javax.net.ssl.SSLContext
 import javax.net.ssl.SSLEngine
 import javax.net.ssl.SSLEngineResult
 import javax.net.ssl.SSLEngineResult.HandshakeStatus
 import javax.net.ssl.SSLPeerUnverifiedException
 import javax.net.ssl.X509ExtendedTrustManager
 /**
 * The phone end of the Android Auto TLS session.
 *
 * Two things here are the opposite of what aasdk does, because aasdk implements the head
 * unit and the head unit is the TLS *client*: it calls TLS_client_method() and
 * SSL_set_connect_state (src/Transport/SSLWrapper.cpp:97-140, src/Messenger/Cryptor.cpp:87),
 * and SSL_set_accept_state appears nowhere in that codebase. So the phone is the TLS
 * **server** and its certificate goes out as the server certificate - sent unconditionally
 * on every handshake, which is precisely what we are testing.
 *
 * TLS here is not layered over the socket: handshake bytes travel inside
 * MESSAGE_ENCAPSULATED_SSL control messages (id 3). That rules out SSLSocket and makes
 * SSLEngine - a buffer-to-buffer engine, the JSSE counterpart of aasdk's memory BIO pair -
 * the right tool.
 */
 class PhoneTls(keyStore: KeyStore, password: CharArray) {
    private val log = GearslipLog.tagged("TLS")
    private val engine: SSLEngine
    private var netIn = ByteArray(0)
    private var appBuffer = ByteBuffer.allocate(32 * 1024)
    private var netBuffer = ByteBuffer.allocate(32 * 1024)
    var handshakeComplete: Boolean = false
        private set
    init {
        val keyManagers = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm())
            .apply { init(keyStore, password) }
            .keyManagers
        val context = SSLContext.getInstance("TLSv1.2").apply {
            init(keyManagers, arrayOf(LoggingTrustManager()), SecureRandom())
        }
        engine = context.createSSLEngine().apply {
            useClientMode = false
            // want, not need: we ask the head unit for its certificate so the run also tells
            // us what real units present, but we never make the session depend on getting one.
            wantClientAuth = true
            enabledProtocols = arrayOf("TLSv1.2") // aasdk pins TLS 1.2
        }
        engine.beginHandshake()
    }
    /**
     * Feeds received handshake bytes in and returns whatever must be sent back, each element
     * becoming one MESSAGE_ENCAPSULATED_SSL message.
     */
    fun pumpHandshake(incoming: ByteArray?): List<ByteArray> {
        if (incoming != null) netIn += incoming
        val outgoing = mutableListOf<ByteArray>()
        var source = ByteBuffer.wrap(netIn)
        loop@ while (true) {
            when (engine.handshakeStatus) {
                HandshakeStatus.NEED_TASK -> {
                    var task = engine.delegatedTask
                    while (task != null) {
                        task.run()
                        task = engine.delegatedTask
                    }
                }
                HandshakeStatus.NEED_WRAP -> {
                    netBuffer.clear()
                    val result = engine.wrap(EMPTY, netBuffer)
                    if (result.status == SSLEngineResult.Status.BUFFER_OVERFLOW) {
                        netBuffer = ByteBuffer.allocate(netBuffer.capacity() * 2)
                        continue@loop
                    }
                    netBuffer.flip()
                    if (netBuffer.hasRemaining()) {
                        outgoing += ByteArray(netBuffer.remaining()).also { netBuffer.get(it) }
                    }
                    if (result.status == SSLEngineResult.Status.CLOSED) break@loop
                }
                HandshakeStatus.NEED_UNWRAP -> {
                    appBuffer.clear()
                    val result = engine.unwrap(source, appBuffer)
                    when (result.status) {
                        SSLEngineResult.Status.BUFFER_UNDERFLOW -> break@loop
                        SSLEngineResult.Status.BUFFER_OVERFLOW -> {
                            appBuffer = ByteBuffer.allocate(appBuffer.capacity() * 2)
                            continue@loop
                        }
                        SSLEngineResult.Status.CLOSED -> break@loop
                        else -> Unit
                    }
                }
                HandshakeStatus.FINISHED, HandshakeStatus.NOT_HANDSHAKING -> break@loop
                else -> break@loop
            }
        }
        netIn = ByteArray(source.remaining()).also { source.get(it) }
        if (!handshakeComplete && engine.handshakeStatus == HandshakeStatus.NOT_HANDSHAKING &&
            engine.session.cipherSuite != "SSL_NULL_WITH_NULL_NULL"
        ) {
            handshakeComplete = true
            describeSession()
        }
        return outgoing
    }
    /** Wraps a control-channel payload for an ENCRYPTED frame. */
    fun encrypt(plain: ByteArray): ByteArray {
        val source = ByteBuffer.wrap(plain)
        val out = java.io.ByteArrayOutputStream()
        while (source.hasRemaining()) {
            netBuffer.clear()
            val result = engine.wrap(source, netBuffer)
            if (result.status == SSLEngineResult.Status.BUFFER_OVERFLOW) {
                netBuffer = ByteBuffer.allocate(netBuffer.capacity() * 2)
                continue
            }
            netBuffer.flip()
            val chunk = ByteArray(netBuffer.remaining())
            netBuffer.get(chunk)
            out.write(chunk)
        }
        return out.toByteArray()
    }
    /**
     * Unwraps one ENCRYPTED frame's payload. aasdk decrypts per frame
     * (MessageOutStream::compoundFrame encrypts per frame), so each frame's payload is
     * self-contained ciphertext.
     */
    fun decrypt(cipher: ByteArray): ByteArray {
        val source = ByteBuffer.wrap(cipher)
        val out = java.io.ByteArrayOutputStream()
        while (source.hasRemaining()) {
            appBuffer.clear()
            val result = engine.unwrap(source, appBuffer)
            when (result.status) {
                SSLEngineResult.Status.BUFFER_OVERFLOW -> {
                    appBuffer = ByteBuffer.allocate(appBuffer.capacity() * 2)
                    continue
                }
                SSLEngineResult.Status.BUFFER_UNDERFLOW -> {
                    log.w("decrypt: record split across frames (${source.remaining()} bytes left over)")
                    break
                }
                SSLEngineResult.Status.CLOSED -> break
                else -> Unit
            }
            appBuffer.flip()
            val chunk = ByteArray(appBuffer.remaining())
            appBuffer.get(chunk)
            out.write(chunk)
            if (result.bytesConsumed() == 0 && result.bytesProduced() == 0) break
        }
        return out.toByteArray()
    }
    private fun describeSession() {
        val session = engine.session
        log.i("TLS handshake COMPLETE - protocol=${session.protocol} cipher=${session.cipherSuite}")
        SessionReport.tls(session.protocol, session.cipherSuite)
        try {
            val peers = session.peerCertificates
            log.i("head unit presented ${peers.size} certificate(s):")
            peers.forEachIndexed { index, certificate ->
                if (certificate is X509Certificate) {
                    log.i("  [$index] subject=${certificate.subjectX500Principal}")
                    log.i("       issuer =${certificate.issuerX500Principal}")
                    log.i("       serial =${certificate.serialNumber} valid=${certificate.notBefore}..${certificate.notAfter}")
                }
            }
        } catch (_: SSLPeerUnverifiedException) {
            log.i("head unit presented NO certificate (we asked but did not require one)")
        }
    }
    /** Accepts everything and reports what it saw. We want the data, not a verdict. */
    private class LoggingTrustManager : X509ExtendedTrustManager() {
        private val log = GearslipLog.tagged("TLS")
        override fun checkClientTrusted(chain: Array<out X509Certificate>?, authType: String?) {
            log.i("peer certificate offered (authType=$authType, chain=${chain?.size ?: 0}) - accepting")
        }
        override fun checkClientTrusted(chain: Array<out X509Certificate>?, authType: String?, socket: Socket?) =
            checkClientTrusted(chain, authType)
        override fun checkClientTrusted(chain: Array<out X509Certificate>?, authType: String?, engine: SSLEngine?) =
            checkClientTrusted(chain, authType)
        override fun checkServerTrusted(chain: Array<out X509Certificate>?, authType: String?) =
            checkClientTrusted(chain, authType)
        override fun checkServerTrusted(chain: Array<out X509Certificate>?, authType: String?, socket: Socket?) =
            checkClientTrusted(chain, authType)
        override fun checkServerTrusted(chain: Array<out X509Certificate>?, authType: String?, engine: SSLEngine?) =
            checkClientTrusted(chain, authType)
        override fun getAcceptedIssuers(): Array<X509Certificate> = emptyArray()
    }
    companion object {
        private val EMPTY: ByteBuffer = ByteBuffer.allocate(0)
    }
 }
@@ -0,0 +1,67 @@
 package app.seb3thehacker.gearslip
 import android.content.Context
 import java.io.File
 /** Decides what the car screen shows. */
 object ProjectedContent {
    /**
     * Precedence: the URL saved in Settings, then a `url.txt` in the external files dir (the
     * pre-Settings way, still honoured so existing setups keep working), then [DEFAULT_URL].
     */
    fun resolve(context: Context): String {
        val saved = AppSettings.startupUrl(context)
        if (saved.isNotEmpty()) {
            val url = normalize(saved)
            GearslipLog.i("projecting startup URL from settings: $url")
            return url
        }
        val legacy = context.getExternalFilesDir(null)?.let { File(it, "url.txt") }
        if (legacy != null && legacy.isFile) {
            val url = legacy.readText().trim()
            if (url.isNotEmpty()) {
                GearslipLog.i("projecting url.txt override: $url")
                return url
            }
        }
        return DEFAULT_URL
    }
    /** What the Web app opens until a page is chosen in Settings. */
    const val DEFAULT_URL = "https://duckduckgo.com"
    /** A bare "example.com" is a URL the user meant; raw HTML is passed through untouched. */
    private fun normalize(value: String): String =
        if (value.startsWith("<") || "://" in value) value else "https://$value"
    /** Big targets, a live clock, and tap feedback - all verifiable at a glance in a car. */
    val TEST_PAGE = """
        <html><head><meta name="viewport" content="width=device-width,initial-scale=1">
        <style>
          html{height:100%}
          body{margin:0;font-family:sans-serif;background:#101418;color:#fff;
               display:flex;flex-direction:column;height:100%}
          h1{margin:12px;font-size:28px}
          #t{margin:0 12px 8px;font-size:20px;color:#8ab4f8}
          .row{display:flex;flex:1;gap:8px;padding:8px}
          .b{flex:1;display:flex;align-items:center;justify-content:center;
             font-size:26px;border-radius:12px;background:#243043}
          .hit{background:#2e7d32}
        </style></head><body>
        <h1>Gearslip &mdash; projected from the phone</h1>
        <div id="t">starting&hellip;</div>
        <div class="row">
          <div class="b" id="a">TAP A</div><div class="b" id="b">TAP B</div>
          <div class="b" id="c">TAP C</div>
        </div>
        <script>
          setInterval(function(){document.getElementById('t').textContent=new Date().toLocaleTimeString();},1000);
          ['a','b','c'].forEach(function(id){
            var e=document.getElementById(id);
            e.addEventListener('touchstart',function(){e.classList.add('hit');e.textContent='HIT '+id.toUpperCase();});
            e.addEventListener('touchend',function(){setTimeout(function(){e.classList.remove('hit');e.textContent='TAP '+id.toUpperCase();},400);});
          });
        </script></body></html>
    """.trimIndent()
 }
@@ -0,0 +1,30 @@
 package app.seb3thehacker.gearslip
 import android.view.Surface
 /**
 * Lets [GearslipRunner] drive on-screen content without owning any Android UI itself.
 *
 * The protocol side decides *when* a surface is needed and *where* touches landed; the
 * activity decides *what* to render and how to inject events, because both need a UI thread
 * and a Context.
 */
 interface Projection {
    /** Called once the encoder's input Surface exists and content should start rendering. */
    fun onSurfaceReady(surface: Surface, width: Int, height: Int, densityDpi: Int)
    /**
     * A touch from the head unit, already scaled into projected-video coordinates.
     * [action] is an Android MotionEvent action - Android Auto's PointerAction enum uses
     * identical values (DOWN=0, UP=1, MOVED=2, POINTER_DOWN=5, POINTER_UP=6). [points] is every
     * finger currently down, and [actionIndex] says which of them [action] is about, so a pinch
     * arrives as it would on the phone's own screen.
     */
    fun onTouch(action: Int, actionIndex: Int, points: List<TouchPoint>)
    fun onProjectionStopped()
 }
 /** One finger on the car's screen: a stable [id] for as long as it stays down, and where it is. */
 class TouchPoint(val id: Int, val x: Float, val y: Float)
@@ -0,0 +1,181 @@
 package app.seb3thehacker.gearslip
 import java.io.ByteArrayOutputStream
 /**
 * Just enough protobuf to run the spike, hand-rolled so there is no protoc step.
 *
 * Only three messages are ever written (AuthResponse is only read):
 *   ServiceDiscoveryRequest { optional string label_text = 4; optional string device_name = 5; }
 *   PingResponse            { required int64 timestamp = 1; }
 *   AuthResponse            { required int32 status = 1; }
 */
 object Protobuf {
    fun varint(value: Long): ByteArray {
        val out = ByteArrayOutputStream()
        var v = value
        while (true) {
            val b = (v and 0x7F).toInt()
            v = v ushr 7
            if (v == 0L) {
                out.write(b)
                return out.toByteArray()
            }
            out.write(b or 0x80)
        }
    }
    fun stringField(field: Int, value: String): ByteArray {
        val bytes = value.toByteArray(Charsets.UTF_8)
        return varint(((field shl 3) or 2).toLong()) + varint(bytes.size.toLong()) + bytes
    }
    fun varintField(field: Int, value: Long): ByteArray =
        varint((field shl 3).toLong()) + varint(value)
    /** Reads the single int32 in AuthResponse. Negative values are 10-byte varints. */
    fun readInt32Field(data: ByteArray, field: Int): Int? = readInt64Field(data, field)?.toInt()
    /** Reads a varint field whole, for int64s such as a ping's timestamp. */
    fun readInt64Field(data: ByteArray, field: Int): Long? {
        var pos = 0
        while (pos < data.size) {
            val (tag, afterTag) = readVarint(data, pos) ?: return null
            pos = afterTag
            val number = (tag ushr 3).toInt()
            when ((tag and 7L).toInt()) {
                0 -> {
                    val (value, afterValue) = readVarint(data, pos) ?: return null
                    pos = afterValue
                    if (number == field) return value
                }
                2 -> {
                    val (len, afterLen) = readVarint(data, pos) ?: return null
                    pos = afterLen + len.toInt()
                }
                5 -> pos += 4
                1 -> pos += 8
                else -> return null
            }
        }
        return null
    }
    /**
     * Shallow field dump. Used on ServiceDiscoveryResponse: its make/model/year strings
     * (fields 2-4) and head-unit info (7-10) coming out readable is the clearest possible
     * proof that the session is live and we are decrypting correctly.
     */
    fun describe(data: ByteArray, indent: String = "  "): String {
        val sb = StringBuilder()
        var pos = 0
        while (pos < data.size) {
            val (tag, afterTag) = readVarint(data, pos) ?: break
            pos = afterTag
            val number = (tag ushr 3).toInt()
            when ((tag and 7L).toInt()) {
                0 -> {
                    val (value, after) = readVarint(data, pos) ?: break
                    pos = after
                    sb.append("$indent#$number varint = $value\n")
                }
                1 -> {
                    if (pos + 8 > data.size) break
                    sb.append("$indent#$number fixed64\n"); pos += 8
                }
                2 -> {
                    val (len, afterLen) = readVarint(data, pos) ?: break
                    val end = afterLen + len.toInt()
                    if (end > data.size) break
                    val body = data.copyOfRange(afterLen, end)
                    pos = end
                    val text = body.toString(Charsets.UTF_8)
                    if (body.isNotEmpty() && text.all { it == '\n' || it == '\t' || it.code in 32..126 }) {
                        sb.append("$indent#$number string = \"$text\"\n")
                    } else {
                        sb.append("$indent#$number message/bytes (${body.size})\n")
                        sb.append(describe(body, "$indent  "))
                    }
                }
                5 -> {
                    if (pos + 4 > data.size) break
                    sb.append("$indent#$number fixed32\n"); pos += 4
                }
                else -> break
            }
        }
        return sb.toString()
    }
    private fun readVarint(data: ByteArray, start: Int): Pair<Long, Int>? {
        var result = 0L
        var shift = 0
        var pos = start
        while (pos < data.size && shift <= 63) {
            val b = data[pos].toInt() and 0xFF
            result = result or ((b and 0x7F).toLong() shl shift)
            pos++
            if (b and 0x80 == 0) return result to pos
            shift += 7
        }
        return null
    }
 }
 /** Structured field access, for walking ServiceDiscoveryResponse without protoc. */
 object Wire {
    class Field(val number: Int, val wireType: Int, val varint: Long, val bytes: ByteArray?)
    fun fields(data: ByteArray): List<Field> {
        val out = mutableListOf<Field>()
        var pos = 0
        while (pos < data.size) {
            val tag = readVarint(data, pos) ?: break
            pos = tag.second
            val number = (tag.first ushr 3).toInt()
            when ((tag.first and 7L).toInt()) {
                0 -> {
                    val v = readVarint(data, pos) ?: break
                    pos = v.second
                    out += Field(number, 0, v.first, null)
                }
                1 -> { if (pos + 8 > data.size) break; pos += 8 }
                2 -> {
                    val len = readVarint(data, pos) ?: break
                    val end = len.second + len.first.toInt()
                    if (end > data.size || end < len.second) break
                    out += Field(number, 2, 0, data.copyOfRange(len.second, end))
                    pos = end
                }
                5 -> { if (pos + 4 > data.size) break; pos += 4 }
                else -> break
            }
        }
        return out
    }
    fun varint(fields: List<Field>, number: Int): Long? =
        fields.firstOrNull { it.number == number && it.wireType == 0 }?.varint
    fun bytes(fields: List<Field>, number: Int): ByteArray? =
        fields.firstOrNull { it.number == number && it.wireType == 2 }?.bytes
    fun allBytes(fields: List<Field>, number: Int): List<ByteArray> =
        fields.filter { it.number == number && it.wireType == 2 }.mapNotNull { it.bytes }
    private fun readVarint(data: ByteArray, start: Int): Pair<Long, Int>? {
        var result = 0L
        var shift = 0
        var pos = start
        while (pos < data.size && shift <= 63) {
            val b = data[pos].toInt() and 0xFF
            result = result or ((b and 0x7F).toLong() shl shift)
            pos++
            if (b and 0x80 == 0) return result to pos
            shift += 7
        }
        return null
    }
 }
@@ -0,0 +1,245 @@
 package app.seb3thehacker.gearslip
 import android.app.ActivityOptions
 import android.app.Presentation
 import android.content.Context
 import android.content.Intent
 import android.graphics.Color
 import android.hardware.display.DisplayManager
 import android.hardware.display.VirtualDisplay
 import android.os.SystemClock
 import android.view.MotionEvent
 import android.view.Surface
 import android.view.View
 import android.view.ViewGroup
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.platform.ComposeView
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.LifecycleRegistry
 import androidx.lifecycle.ViewModelStore
 import androidx.lifecycle.ViewModelStoreOwner
 import androidx.lifecycle.setViewTreeLifecycleOwner
 import androidx.lifecycle.setViewTreeViewModelStoreOwner
 import androidx.savedstate.SavedStateRegistry
 import androidx.savedstate.SavedStateRegistryController
 import androidx.savedstate.SavedStateRegistryOwner
 import androidx.savedstate.setViewTreeSavedStateRegistryOwner
 /**
 * Renders the car UI into the encoder's input Surface.
 *
 * Uses the same mechanism as Android screen mirroring: a VirtualDisplay backed by the
 * MediaCodec input Surface, with a Presentation hosting a Compose view on that display.
 * Anything drawn there is encoded and projected - no hand-written EGL/GL.
 *
 * Everything here must run on the main thread: Presentation is a Dialog.
 */
 class ScreenProjector(private val context: Context) {
    private var virtualDisplay: VirtualDisplay? = null
    private var presentation: Presentation? = null
    private var owner: ViewTreeOwner? = null
    private var root: View? = null
    /** Tracks the synthetic gesture so injected MotionEvents have a coherent downTime. */
    private var downTime = 0L
    /**
     * [name] names the virtual display so the two callers are told apart from outside the app
     * (`dumpsys display`): the real car session keeps "gearslip-projection", the on-phone bench
     * preview passes "gearslip-preview".
     */
    fun start(
        surface: Surface,
        width: Int,
        height: Int,
        densityDpi: Int,
        name: String = "gearslip-projection",
        content: @Composable () -> Unit,
    ) {
        stop()
        val displayManager = context.getSystemService(DisplayManager::class.java)
        // OWN_CONTENT_ONLY, not PUBLIC: we render our own Presentation rather than mirroring
        // the phone screen. PUBLIC marks the display as screen sharing, which the platform
        // refuses without ADD_MIRROR_DISPLAY/CAPTURE_VIDEO_OUTPUT or a MediaProjection token -
        // and going the MediaProjection route would put a consent dialog in front of the
        // driver on every connect.
        val display = try {
            displayManager.createVirtualDisplay(
                name, width, height, densityDpi, surface,
                DisplayManager.VIRTUAL_DISPLAY_FLAG_PRESENTATION or
                    DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY,
            )
        } catch (t: Throwable) {
            GearslipLog.e("createVirtualDisplay failed", t)
            null
        }
        if (display == null) {
            GearslipLog.e("createVirtualDisplay returned null - cannot project")
            return
        }
        virtualDisplay = display
        val show = Presentation(context, display.display)
        val window = checkNotNull(show.window) { "presentation has no window" }
        window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
        // A ComposeView outside an Activity has no lifecycle, saved-state or view-model owner
        // to find up its view tree, and refuses to compose without them. Hand it ours.
        val treeOwner = ViewTreeOwner()
        val decor = window.decorView
        decor.setViewTreeLifecycleOwner(treeOwner)
        decor.setViewTreeSavedStateRegistryOwner(treeOwner)
        decor.setViewTreeViewModelStoreOwner(treeOwner)
        decor.setBackgroundColor(Color.BLACK)
        show.setContentView(ComposeView(show.context).apply { setContent(content) })
        show.show()
        presentation = show
        owner = treeOwner
        root = decor
        GearslipLog.i("projecting ${width}x$height @ ${densityDpi}dpi")
    }
    /** The projected display's id, for placing other apps' activities on it. */
    val displayId: Int? get() = virtualDisplay?.display?.displayId
    /**
     * Shows or hides our own Compose UI. A Presentation is a TYPE_PRESENTATION window, so it
     * draws above any activity on the same display and must be hidden to reveal one.
     */
    fun setOverlayVisible(visible: Boolean) {
        if (visible) presentation?.show() else presentation?.hide()
    }
    /**
     * Launches another app's activity onto the projected display. The Presentation is hidden
     * first, since it would otherwise draw over the app.
     *
     * Does not work yet for third-party apps, and measuring why is recorded here so the next
     * attempt doesn't repeat it. Two separate platform gates, both confirmed on Android 17:
     *  1. `setLaunchDisplayId` requires INTERNAL_SYSTEM_WINDOW in the *caller*. We don't hold
     *     it, so this throws SecurityException. Launching the same activity from a shell-uid
     *     caller places the task on this display fine.
     *  2. Even once placed, the task stays visible=false, because this display is created
     *     FLAG_PRIVATE - a private display only ever shows its owner's windows.
     * Fixing (2) needs a display created with VIRTUAL_DISPLAY_FLAG_TRUSTED, which needs the
     * signature permission ADD_TRUSTED_DISPLAY. The route that avoids shell privilege entirely
     * is VirtualDeviceManager (a companion-device app-streaming association), which hands out
     * a display built for hosting other apps plus its own virtual touchscreen.
     */
    fun launchApp(intent: Intent): Boolean {
        val display = virtualDisplay ?: return false
        return try {
            val options = ActivityOptions.makeBasic().setLaunchDisplayId(display.display.displayId)
            presentation?.hide()
            context.startActivity(intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK), options.toBundle())
            GearslipLog.i("launched ${intent.component ?: intent.`package`} on display ${display.display.displayId}")
            true
        } catch (t: Throwable) {
            GearslipLog.e("launchApp failed", t)
            presentation?.show()
            false
        }
    }
    /**
     * [action] is already an Android MotionEvent action; [points] are in projected coordinates and
     * hold every finger down, with [actionIndex] naming the one the action is about. Two fingers
     * arrive as one gesture, so pinch and two-finger drags work as they do on the phone itself.
     */
    fun dispatchTouch(action: Int, actionIndex: Int, points: List<TouchPoint>) {
        val target = root ?: return
        if (points.isEmpty()) return
        val now = SystemClock.uptimeMillis()
        if (action == MotionEvent.ACTION_DOWN || downTime == 0L) downTime = now
        val properties = Array(points.size) { i ->
            MotionEvent.PointerProperties().apply {
                id = points[i].id
                toolType = MotionEvent.TOOL_TYPE_FINGER
            }
        }
        val coords = Array(points.size) { i ->
            MotionEvent.PointerCoords().apply {
                x = points[i].x
                y = points[i].y
                pressure = 1f
                size = 1f
            }
        }
        // A second finger going down or up carries which finger it was in the action itself.
        val encoded = when (action) {
            MotionEvent.ACTION_POINTER_DOWN, MotionEvent.ACTION_POINTER_UP ->
                action or (actionIndex shl MotionEvent.ACTION_POINTER_INDEX_SHIFT)
            else -> action
        }
        val event = MotionEvent.obtain(
            downTime, now, encoded, points.size, properties, coords,
            0, 0, 1f, 1f, 0, 0, android.view.InputDevice.SOURCE_TOUCHSCREEN, 0,
        )
        try {
            target.dispatchTouchEvent(event)
        } finally {
            event.recycle()
        }
        if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) downTime = 0L
    }
    /**
     * A key from the car's D-pad or knob, as a hardware key event on the car display. Compose
     * moves focus between buttons on arrows and Tab, and clicks the focused one on OK/Enter.
     * [keyCode] of [CarKeys.KEYCODE_SHIFT_TAB] is Tab with Shift held.
     */
    fun dispatchKey(keyCode: Int, down: Boolean) {
        val target = root ?: return
        // Nothing on the display takes keys until something in it holds focus.
        if (target.findFocus() == null) target.requestFocus()
        val shift = keyCode == app.seb3thehacker.gearslip.car.CarKeys.KEYCODE_SHIFT_TAB
        val code = if (shift) android.view.KeyEvent.KEYCODE_TAB else keyCode
        val now = SystemClock.uptimeMillis()
        val event = android.view.KeyEvent(
            now, now,
            if (down) android.view.KeyEvent.ACTION_DOWN else android.view.KeyEvent.ACTION_UP,
            code, 0,
            if (shift) android.view.KeyEvent.META_SHIFT_ON or android.view.KeyEvent.META_SHIFT_LEFT_ON else 0,
            android.view.KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, android.view.InputDevice.SOURCE_DPAD,
        )
        target.dispatchKeyEvent(event)
    }
    fun stop() {
        runCatching { presentation?.dismiss() }
        runCatching { owner?.destroy() }
        runCatching { virtualDisplay?.release() }
        presentation = null
        owner = null
        root = null
        virtualDisplay = null
        downTime = 0L
    }
    private class ViewTreeOwner : LifecycleOwner, SavedStateRegistryOwner, ViewModelStoreOwner {
        private val registry = LifecycleRegistry(this)
        private val savedState = SavedStateRegistryController.create(this)
        override val lifecycle: Lifecycle get() = registry
        override val savedStateRegistry: SavedStateRegistry get() = savedState.savedStateRegistry
        override val viewModelStore = ViewModelStore()
        init {
            savedState.performRestore(null)
            registry.currentState = Lifecycle.State.RESUMED
        }
        fun destroy() {
            registry.currentState = Lifecycle.State.DESTROYED
            viewModelStore.clear()
        }
    }
 }
@@ -0,0 +1,124 @@
 package app.seb3thehacker.gearslip
 import java.io.ByteArrayInputStream
 import java.math.BigInteger
 import java.security.KeyPair
 import java.security.KeyPairGenerator
 import java.security.KeyStore
 import java.security.SecureRandom
 import java.security.Signature
 import java.security.cert.CertificateFactory
 import java.security.cert.X509Certificate
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 import java.util.TimeZone
 /**
 * Generates a self-signed RSA-2048 certificate - the thing under test.
 *
 * Written by hand rather than with BouncyCastle so the spike has no dependencies and no
 * second security provider sitting next to Conscrypt. A self-signed X.509 is a fixed
 * structure, so this is mechanical; the risk is a silent malformation, which
 * [generate] closes off by parsing its own output back through CertificateFactory and
 * verifying the signature before returning. A bad certificate therefore fails loudly on the
 * bench instead of looking like a head-unit rejection in the car.
 *
 * RSA-2048 matches aasdk's own key (cert/headunit.key) - see cert/README.md.
 */
 object SelfSignedCert {
    const val ALIAS = "phone"
    val PASSWORD: CharArray = "spike".toCharArray()
    // Pre-encoded OIDs, so there is no OID encoder to get wrong.
    private val OID_SHA256_RSA = byteArrayOf(
        0x06, 0x09, 0x2A, 0x86.toByte(), 0x48, 0x86.toByte(), 0xF7.toByte(), 0x0D, 0x01, 0x01, 0x0B
    )
    private val OID_CN = byteArrayOf(0x06, 0x03, 0x55, 0x04, 0x03)
    private val OID_O = byteArrayOf(0x06, 0x03, 0x55, 0x04, 0x0A)
    class Result(val keyStore: KeyStore, val certificate: X509Certificate)
    fun generate(commonName: String = "Gearslip", organisation: String = "Gearslip"): Result {
        val keyPair = KeyPairGenerator.getInstance("RSA").apply { initialize(2048) }.generateKeyPair()
        val now = System.currentTimeMillis()
        val notBefore = Date(now - 86_400_000L)            // a day of slack for head-unit clock skew
        val notAfter = Date(now + 20L * 365 * 86_400_000L) // ~2046, still inside UTCTime's pre-2050 range
        val der = buildCertificate(keyPair, commonName, organisation, notBefore, notAfter)
        // Self-check: malformed DER throws here, on the bench, not in the car.
        val certificate = CertificateFactory.getInstance("X.509")
            .generateCertificate(ByteArrayInputStream(der)) as X509Certificate
        certificate.verify(keyPair.public)
        certificate.checkValidity()
        val keyStore = KeyStore.getInstance("PKCS12").apply {
            load(null, null)
            setKeyEntry(ALIAS, keyPair.private, PASSWORD, arrayOf(certificate))
        }
        return Result(keyStore, certificate)
    }
    private fun buildCertificate(
        keyPair: KeyPair,
        commonName: String,
        organisation: String,
        notBefore: Date,
        notAfter: Date,
    ): ByteArray {
        val algorithmId = seq(OID_SHA256_RSA, tlv(0x05, ByteArray(0))) // sha256WithRSAEncryption, NULL params
        val name = seq(rdn(OID_CN, commonName), rdn(OID_O, organisation))
        val serial = BigInteger(64, SecureRandom()).add(BigInteger.ONE)
        val tbs = seq(
            tlv(0xA0, integer(BigInteger.valueOf(2))), // [0] EXPLICIT version, v3
            integer(serial),
            algorithmId,
            name,
            seq(utcTime(notBefore), utcTime(notAfter)),
            name,
            keyPair.public.encoded,                    // already a DER SubjectPublicKeyInfo
        )
        val signature = Signature.getInstance("SHA256withRSA").run {
            initSign(keyPair.private)
            update(tbs)
            sign()
        }
        return seq(tbs, algorithmId, bitString(signature))
    }
    // --- minimal DER writer ------------------------------------------------------------
    private fun length(n: Int): ByteArray {
        if (n < 0x80) return byteArrayOf(n.toByte())
        var value = n
        val out = ArrayList<Byte>()
        while (value > 0) {
            out.add(0, (value and 0xFF).toByte())
            value = value ushr 8
        }
        return byteArrayOf((0x80 or out.size).toByte()) + out.toByteArray()
    }
    private fun tlv(tag: Int, body: ByteArray) = byteArrayOf(tag.toByte()) + length(body.size) + body
    private fun seq(vararg parts: ByteArray) = tlv(0x30, parts.reduce { a, b -> a + b })
    private fun integer(v: BigInteger) = tlv(0x02, v.toByteArray())
    private fun bitString(body: ByteArray) = tlv(0x03, byteArrayOf(0x00) + body)
    private fun rdn(oid: ByteArray, value: String) =
        tlv(0x31, seq(oid, tlv(0x0C, value.toByteArray(Charsets.UTF_8))))
    private fun utcTime(date: Date): ByteArray {
        val format = SimpleDateFormat("yyMMddHHmmss", Locale.US).apply {
            timeZone = TimeZone.getTimeZone("UTC")
        }
        return tlv(0x17, (format.format(date) + "Z").toByteArray(Charsets.US_ASCII))
    }
 }
@@ -0,0 +1,245 @@
 package app.seb3thehacker.gearslip
 /**
 * Pulls the video service out of a ServiceDiscoveryResponse.
 *
 * Shape from aasdk (`service/Service.proto`, `service/media/sink/MediaSinkService.proto`,
 * `.../message/VideoConfiguration.proto`):
 *
 *   ServiceDiscoveryResponse { repeated Service channels = 1; ... }
 *   Service { required int32 id = 1; optional MediaSinkService media_sink_service = 3; ... }
 *   MediaSinkService { optional MediaCodecType available_type = 1;
 *                      repeated VideoConfiguration video_configs = 4; ... }
 *   VideoConfiguration { codec_resolution = 1; frame_rate = 2; density = 5; ... }
 *
 * The channel id used in the frame header is this service's `id` - real Android Auto assigns
 * channel ids dynamically (aasdk's static ChannelId enum is an approximation; see the TODO
 * in include/aasdk/Messenger/ChannelId.hpp).
 */
 object ServiceDiscovery {
    /**
     * [widthMargin]/[heightMargin] are the head unit's own numbers (VideoConfiguration fields 3
     * and 4): pixels of the frame it crops away, split evenly between the two edges, to fit the
     * frame to a screen of a different shape. A matched vehicle profile's insets override them.
     */
    class VideoConfig(
        val resolution: Int,
        val frameRate: Int,
        val density: Int,
        val widthMargin: Int = 0,
        val heightMargin: Int = 0,
    ) {
        val resolutionName: String get() = RESOLUTIONS[resolution] ?: "unknown($resolution)"
        val frameRateName: String get() = if (frameRate == 1) "60fps" else "30fps"
        /** Pixel dimensions for this resolution enum, or null if we don't know it. */
        fun pixelSize(): Pair<Int, Int>? = PIXEL_SIZES[resolution]
        fun pixelCount(): Int = pixelSize()?.let { it.first * it.second } ?: Int.MAX_VALUE
        /** What's left on the car's screen once the margins are cropped off. */
        fun visibleSize(): Pair<Int, Int>? = pixelSize()?.let { (w, h) -> (w - widthMargin) to (h - heightMargin) }
        /** The margins as the strips of the frame the car UI keeps clear. */
        fun marginInsets(): Insets = Insets(
            top = heightMargin / 2, bottom = heightMargin - heightMargin / 2,
            left = widthMargin / 2, right = widthMargin - widthMargin / 2,
        )
        override fun toString() =
            "$resolutionName @ $frameRateName, density=$density, margin=${widthMargin}x$heightMargin"
    }
    class VideoService(val serviceId: Int, val codecType: Int, val configs: List<VideoConfig>) {
        val codecName: String get() = CODECS[codecType] ?: "unknown($codecType)"
    }
    class AudioConfig(val sampleRate: Int, val bits: Int, val channels: Int)
    class AudioService(
        val serviceId: Int,
        val streamType: Int,
        val codecType: Int,
        val configs: List<AudioConfig>,
    ) {
        val codecName: String get() = CODECS[codecType] ?: "unknown($codecType)"
        val streamName: String get() = STREAMS[streamType] ?: "unknown($streamType)"
    }
    /**
     * Every audio sink the head unit offers (media, guidance, system, telephony). Same
     * MediaSinkService as video, told apart by carrying `audio_type = 2` and
     * `repeated AudioConfiguration audio_configs = 3 { sampling_rate = 1; bits = 2; channels = 3 }`.
     */
    fun findAudioServices(response: ByteArray): List<AudioService> = buildList {
        for (channel in Wire.allBytes(Wire.fields(response), 1)) {
            val service = Wire.fields(channel)
            val id = Wire.varint(service, 1)?.toInt() ?: continue
            val sink = Wire.bytes(service, 3) ?: continue
            val sinkFields = Wire.fields(sink)
            val audioConfigs = Wire.allBytes(sinkFields, 3)
            if (audioConfigs.isEmpty()) continue
            add(
                AudioService(
                    serviceId = id,
                    streamType = Wire.varint(sinkFields, 2)?.toInt() ?: 0,
                    codecType = Wire.varint(sinkFields, 1)?.toInt() ?: 1,
                    configs = audioConfigs.map {
                        val f = Wire.fields(it)
                        AudioConfig(
                            sampleRate = Wire.varint(f, 1)?.toInt() ?: 48_000,
                            bits = Wire.varint(f, 2)?.toInt() ?: 16,
                            channels = Wire.varint(f, 3)?.toInt() ?: 2,
                        )
                    },
                ),
            )
        }
    }
    private val STREAMS = mapOf(0 to "NONE", 1 to "GUIDANCE", 2 to "SYSTEM_AUDIO", 3 to "MEDIA", 4 to "TELEPHONY")
    private val RESOLUTIONS = mapOf(
        1 to "800x480", 2 to "1280x720", 3 to "1920x1080", 4 to "2560x1440",
        5 to "3840x2160", 6 to "720x1280", 7 to "1080x1920", 8 to "1440x2560", 9 to "2160x3840",
    )
    private val PIXEL_SIZES = mapOf(
        1 to (800 to 480), 2 to (1280 to 720), 3 to (1920 to 1080), 4 to (2560 to 1440),
        5 to (3840 to 2160), 6 to (720 to 1280), 7 to (1080 to 1920), 8 to (1440 to 2560),
        9 to (2160 to 3840),
    )
    private val CODECS = mapOf(
        1 to "AUDIO_PCM", 2 to "AUDIO_AAC_LC", 3 to "VIDEO_H264_BP",
        4 to "AUDIO_AAC_LC_ADTS", 5 to "VIDEO_VP9", 6 to "VIDEO_AV1", 7 to "VIDEO_H265",
    )
    /**
     * The head unit's touchscreen and button set, from InputSourceService (Service field 4):
     *   InputSourceService { repeated int32 keycodes_supported = 1 [packed=true];
     *                         repeated TouchScreen touchscreen = 2; ... }
     *   TouchScreen { required int32 width = 1; required int32 height = 2; type = 3; }
     *
     * Touch coordinates arrive in this space (1258x708 on the 2018 Uconnect) and must be
     * scaled to the projected video size before injection. [keycodesSupported] is what the
     * head unit says it will actually send over the Input channel as key events (steering-wheel
     * buttons, etc.) - not every unit reports the same set, so it's kept for diagnostics and to
     * know ahead of time whether a button like voice/PTT is even wired up on this hardware.
     */
    class InputService(
        val serviceId: Int,
        val touchWidth: Int,
        val touchHeight: Int,
        val keycodesSupported: List<Int> = emptyList(),
    )
    fun findInputService(response: ByteArray): InputService? {
        for (channel in Wire.allBytes(Wire.fields(response), 1)) {
            val service = Wire.fields(channel)
            val id = Wire.varint(service, 1)?.toInt() ?: continue
            val input = Wire.bytes(service, 4) ?: continue
            val inputFields = Wire.fields(input)
            // A unit with only a knob and buttons has no touchscreen entry; it still has keys.
            val touchFields = Wire.bytes(inputFields, 2)?.let { Wire.fields(it) }.orEmpty()
            val width = Wire.varint(touchFields, 1)?.toInt() ?: 0
            val height = Wire.varint(touchFields, 2)?.toInt() ?: 0
            // Declared packed, but some units send each keycode as its own field.
            val keycodes = inputFields.filter { it.number == 1 }.flatMap { f ->
                f.bytes?.let(::packedVarints) ?: listOf(f.varint.toInt())
            }
            return InputService(id, width, height, keycodes)
        }
        return null
    }
    /** Decodes a `[packed=true]` repeated varint field's raw bytes into individual values. */
    private fun packedVarints(data: ByteArray): List<Int> = buildList {
        var pos = 0
        while (pos < data.size) {
            var result = 0L
            var shift = 0
            while (pos < data.size) {
                val b = data[pos].toInt() and 0xFF
                result = result or ((b and 0x7F).toLong() shl shift)
                pos++
                if (b and 0x80 == 0) break
                shift += 7
            }
            add(result.toInt())
        }
    }
    fun findVideoService(response: ByteArray): VideoService? {
        for (channel in Wire.allBytes(Wire.fields(response), 1)) {
            val service = Wire.fields(channel)
            val id = Wire.varint(service, 1)?.toInt() ?: continue
            val sink = Wire.bytes(service, 3) ?: continue
            val sinkFields = Wire.fields(sink)
            val videoConfigs = Wire.allBytes(sinkFields, 4)
            if (videoConfigs.isEmpty()) continue // audio sink, not video
            val codecType = Wire.varint(sinkFields, 1)?.toInt() ?: 0
            val configs = videoConfigs.map {
                val f = Wire.fields(it)
                VideoConfig(
                    resolution = Wire.varint(f, 1)?.toInt() ?: 0,
                    frameRate = Wire.varint(f, 2)?.toInt() ?: 0,
                    density = Wire.varint(f, 5)?.toInt() ?: 0,
                    widthMargin = Wire.varint(f, 3)?.toInt() ?: 0,
                    heightMargin = Wire.varint(f, 4)?.toInt() ?: 0,
                )
            }
            return VideoService(id, codecType, configs)
        }
        return null
    }
    /**
     * The head unit's sensor feed, from SensorSourceService (Service field 5):
     *   SensorSourceService { repeated SensorType sensors = 1; }
     *   SensorType { required int32 type = 1; }
     *
     * Field numbers for what actually rides inside each SensorEvent once subscribed are not
     * pinned down here - unlike video/audio/input, there's no independent source to check them
     * against, so [CarSensors] shows the raw decode instead of trusting a guessed field map.
     */
    class SensorService(val serviceId: Int, val types: List<Int>)
    fun findSensorService(response: ByteArray): SensorService? {
        for (channel in Wire.allBytes(Wire.fields(response), 1)) {
            val service = Wire.fields(channel)
            val id = Wire.varint(service, 1)?.toInt() ?: continue
            val sensorSource = Wire.bytes(service, 5) ?: continue
            val types = Wire.allBytes(Wire.fields(sensorSource), 1).mapNotNull {
                Wire.varint(Wire.fields(it), 1)?.toInt()
            }
            if (types.isEmpty()) continue
            return SensorService(id, types)
        }
        return null
    }
    /**
     * Who the head unit says it is, from the top-level strings of ServiceDiscoveryResponse.
     * Field numbers as seen from a 2018 Dodge Challenger: 2="Uconnect", 3="Dodge Challenger",
     * 4="18", 7="Delphi", 8="VP2_R Uconnect 7".
     */
    class HeadUnitInfo(
        val headUnitName: String,
        val carModel: String,
        val carYear: String,
        val headUnitMake: String,
        val headUnitModel: String,
    ) {
        override fun toString() =
            "name=\"$headUnitName\" car=\"$carModel\" year=\"$carYear\" " +
                "make=\"$headUnitMake\" model=\"$headUnitModel\""
    }
    fun findHeadUnitInfo(response: ByteArray): HeadUnitInfo {
        val fields = Wire.fields(response)
        fun text(number: Int) = Wire.bytes(fields, number)?.toString(Charsets.UTF_8).orEmpty()
        return HeadUnitInfo(text(2), text(3), text(4), text(7), text(8))
    }
 }
@@ -0,0 +1,133 @@
 package app.seb3thehacker.gearslip
 import android.content.Context
 import android.os.Build
 /**
 * The facts a bug report needs, gathered as a session runs and printed as one readable block
 * when it ends. The log holds the full trace; this holds the answer to "what went wrong,
 * on what car, on what phone" so nobody has to read the trace to find out.
 *
 * Nothing here identifies a person: no serial numbers, accounts, locations or accessory
 * serials. The head unit and vehicle strings are what the head unit itself announces.
 */
 object SessionReport {
    /** Where a session failed, coarse enough to count and group reports by. */
    enum class Category(val label: String) {
        NONE("none"),
        USB("USB transport"),
        NO_HANDSHAKE("head unit never started talking"),
        TLS("TLS handshake failed"),
        CERTIFICATE("certificate rejected by the head unit"),
        AUTH("authentication failed"),
        SERVICE_DISCOVERY("service discovery failed"),
        VIDEO("video stream failed"),
        BYEBYE("head unit ended the session"),
        CRASH("app crash"),
        UNKNOWN("unclassified"),
    }
    private var appVersion = "?"
    private var appCode = 0L
    @Volatile private var startedAt = 0L
    @Volatile var category = Category.NONE; private set
    @Volatile private var failure = ""
    @Volatile private var protocolVersion = ""
    @Volatile private var certSource = ""
    @Volatile private var certIssuer = ""
    @Volatile private var tlsProtocol = ""
    @Volatile private var tlsCipher = ""
    @Volatile private var authStatus: Int? = null
    @Volatile private var headUnit = ""
    @Volatile private var profile = ""
    @Volatile private var video = ""
    @Volatile private var audio = ""
    @Volatile private var lastStream = ""
    @Volatile private var lastState = ""
    private var printed = false
    fun init(context: Context) {
        val info = runCatching { context.packageManager.getPackageInfo(context.packageName, 0) }.getOrNull()
        appVersion = info?.versionName ?: "?"
        appCode = info?.longVersionCode ?: 0
    }
    fun begin() {
        startedAt = System.currentTimeMillis()
        category = Category.NONE
        failure = ""; protocolVersion = ""; certSource = ""; certIssuer = ""
        tlsProtocol = ""; tlsCipher = ""; authStatus = null
        headUnit = ""; profile = ""; video = ""; lastStream = ""; lastState = ""
        printed = false
    }
    fun protocolVersion(major: Int, minor: Int) { protocolVersion = "$major.$minor" }
    fun certificate(source: String, issuer: String) { certSource = source; certIssuer = issuer }
    fun tls(protocol: String, cipher: String) { tlsProtocol = protocol; tlsCipher = cipher }
    fun auth(status: Int) { authStatus = status }
    fun headUnit(info: String) { headUnit = info }
    fun profile(name: String?) { profile = name ?: "none matched" }
    fun video(summary: String) { video = summary }
    fun audio(summary: String) { audio = summary }
    fun stream(summary: String) { lastStream = summary }
    /** Records the first failure only: later ones are usually fallout from it. */
    fun fail(category: Category, detail: String, state: String = "") {
        if (this.category != Category.NONE) return
        this.category = category
        failure = detail
        lastState = state
    }
    fun fail(category: Category, detail: String, t: Throwable, state: String = "") =
        fail(category, "$detail (${GearslipLog.rootCause(t)})", state)
    /** The report as plain text, for the log file and for anything that gets sent. */
    fun render(): String {
        val seconds = if (startedAt == 0L) 0 else (System.currentTimeMillis() - startedAt) / 1000
        fun row(name: String, value: String) = if (value.isEmpty()) "" else "  ${name.padEnd(16)}$value\n"
        return buildString {
            append("=".repeat(60)).append('\n')
            append("SESSION REPORT\n")
            append(row("result", if (category == Category.NONE) "ok / no failure recorded" else "FAILED - ${category.label}"))
            append(row("detail", failure))
            append(row("failed in state", lastState))
            append(row("duration", "${seconds}s"))
            append("\n")
            append(row("gearslip", "$appVersion (code $appCode)"))
            append(row("phone", "${Build.MANUFACTURER} ${Build.MODEL}"))
            append(row("android", "${Build.VERSION.RELEASE} (sdk ${Build.VERSION.SDK_INT}, patch ${Build.VERSION.SECURITY_PATCH})"))
            append("\n")
            append(row("head unit", headUnit))
            append(row("AA protocol", protocolVersion))
            append(row("profile", profile))
            append("\n")
            append(row("phone cert", certSource))
            append(row("cert issuer", certIssuer))
            append(row("TLS", listOf(tlsProtocol, tlsCipher).filter { it.isNotEmpty() }.joinToString(" / ")))
            append(row("auth status", authStatus?.let { "$it (${authName(it)})" } ?: ""))
            append("\n")
            append(row("video", video))
            append(row("audio", audio))
            append(row("last stream stat", lastStream))
            append("=".repeat(60))
        }
    }
    /** Prints the report into the log, once per session. */
    fun print() {
        if (printed || startedAt == 0L) return
        printed = true
        render().lines().forEach { GearslipLog.i(it) }
        GearslipLog.flush()
    }
    private fun authName(status: Int) = when (status) {
        0 -> "success"
        -2 -> "certificate error"
        -3 -> "authentication failure"
        else -> "unknown"
    }
 }
@@ -0,0 +1,46 @@
 package app.seb3thehacker.gearslip
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 /**
 * What the phone UI shows about the current car session.
 *
 * [GearslipRunner] reports progress here as it moves through the handshake, so the UI reads
 * a plain state instead of parsing log lines. A failure stays on screen until the next
 * attach starts, so the reason is still there when the user picks the phone back up.
 */
 object SessionStatus {
    enum class Phase { IDLE, CONNECTING, PROJECTING, FAILED, DISCONNECTED }
    data class Snapshot(val phase: Phase, val headline: String, val detail: String)
    private val flow = MutableStateFlow(
        Snapshot(
            Phase.IDLE,
            "Not connected",
            "Plug the phone into the car's USB port. Gearslip opens by itself when the head unit connects.",
        ),
    )
    val state: StateFlow<Snapshot> = flow
    fun connecting(stage: String) {
        flow.value = Snapshot(Phase.CONNECTING, "Connecting", stage)
    }
    fun projecting() {
        flow.value = Snapshot(Phase.PROJECTING, "Projecting", "Streaming to the head unit.")
    }
    fun failed(headline: String, detail: String) {
        flow.value = Snapshot(Phase.FAILED, headline, detail)
    }
    /** Keeps an earlier failure visible: a rejection is followed by a disconnect every time. */
    fun disconnected() {
        if (flow.value.phase == Phase.FAILED) return
        flow.value = Snapshot(Phase.DISCONNECTED, "Disconnected", "The head unit is no longer connected.")
    }
 }
@@ -0,0 +1,150 @@
 package app.seb3thehacker.gearslip
 import java.net.Socket
 import java.nio.ByteBuffer
 import java.security.SecureRandom
 import java.security.cert.X509Certificate
 import javax.net.ssl.SSLContext
 import javax.net.ssl.SSLEngine
 import javax.net.ssl.SSLEngineResult
 import javax.net.ssl.SSLEngineResult.HandshakeStatus
 import javax.net.ssl.X509ExtendedTrustManager
 /**
 * Runs [PhoneTls] against an in-process TLS client and checks that a full handshake plus a
 * data round trip works.
 *
 * This exists because of one specific hazard: a bug in the certificate, the key manager or
 * the engine wiring produces a dead connection in the car that is indistinguishable from a
 * head unit rejecting us - and the whole point of the spike is a trustworthy go/no-go
 * signal. Run this on the bench first; if it passes, a failure in the car is about the head
 * unit, not about this code.
 */
 object TlsSelfTest {
    private val log = GearslipLog.tagged("TLS")
    fun run(identity: CertProvider.Identity): Boolean {
        log.i("=== TLS self-test starting ===")
        log.i("cert source: ${identity.source}")
        log.i("  subject = ${identity.certificate.subjectX500Principal}")
        log.i("  issuer  = ${identity.certificate.issuerX500Principal}")
        return try {
            val server = PhoneTls(identity.keyStore, identity.password)
            val client = Driver(clientEngine())
            var outbound = client.pump(null) // ClientHello
            var rounds = 0
            while (rounds++ < 20) {
                if (outbound.isEmpty()) break
                val fromServer = mutableListOf<ByteArray>()
                outbound.forEach { fromServer += server.pumpHandshake(it) }
                if (server.handshakeComplete && fromServer.isEmpty()) break
                val fromClient = mutableListOf<ByteArray>()
                fromServer.forEach { fromClient += client.pump(it) }
                outbound = fromClient
            }
            if (!server.handshakeComplete) {
                log.e("self-test FAILED: handshake did not complete after $rounds rounds")
                return false
            }
            // Data round trip, exercising the same encrypt path the spike uses for
            // ServiceDiscoveryRequest.
            val plaintext = "gearslip round trip".toByteArray()
            val decrypted = client.decrypt(server.encrypt(plaintext))
            if (!decrypted.contentEquals(plaintext)) {
                log.e("self-test FAILED: round trip mismatch (${decrypted.size} bytes back)")
                return false
            }
            log.i("=== TLS self-test PASSED - certificate, key manager and engine are sound ===")
            true
        } catch (t: Throwable) {
            log.e("self-test FAILED with an exception", t)
            false
        }
    }
    private fun clientEngine(): SSLEngine {
        val context = SSLContext.getInstance("TLSv1.2")
        context.init(null, arrayOf(TrustAll()), SecureRandom())
        return context.createSSLEngine().apply {
            useClientMode = true
            enabledProtocols = arrayOf("TLSv1.2")
            beginHandshake()
        }
    }
    /** Deliberately a second, independent implementation - it should not share PhoneTls's bugs. */
    private class Driver(private val engine: SSLEngine) {
        private var netIn = ByteArray(0)
        private var app = ByteBuffer.allocate(32 * 1024)
        private var net = ByteBuffer.allocate(32 * 1024)
        fun pump(incoming: ByteArray?): List<ByteArray> {
            if (incoming != null) netIn += incoming
            val out = mutableListOf<ByteArray>()
            val source = ByteBuffer.wrap(netIn)
            loop@ while (true) {
                when (engine.handshakeStatus) {
                    HandshakeStatus.NEED_TASK -> {
                        var task = engine.delegatedTask
                        while (task != null) { task.run(); task = engine.delegatedTask }
                    }
                    HandshakeStatus.NEED_WRAP -> {
                        net.clear()
                        val r = engine.wrap(ByteBuffer.allocate(0), net)
                        if (r.status == SSLEngineResult.Status.BUFFER_OVERFLOW) {
                            net = ByteBuffer.allocate(net.capacity() * 2); continue@loop
                        }
                        net.flip()
                        if (net.hasRemaining()) out += ByteArray(net.remaining()).also { net.get(it) }
                        if (r.status == SSLEngineResult.Status.CLOSED) break@loop
                    }
                    HandshakeStatus.NEED_UNWRAP -> {
                        app.clear()
                        val r = engine.unwrap(source, app)
                        when (r.status) {
                            SSLEngineResult.Status.BUFFER_UNDERFLOW -> break@loop
                            SSLEngineResult.Status.BUFFER_OVERFLOW -> {
                                app = ByteBuffer.allocate(app.capacity() * 2); continue@loop
                            }
                            SSLEngineResult.Status.CLOSED -> break@loop
                            else -> Unit
                        }
                    }
                    else -> break@loop
                }
            }
            netIn = ByteArray(source.remaining()).also { source.get(it) }
            return out
        }
        fun decrypt(cipher: ByteArray): ByteArray {
            val source = ByteBuffer.wrap(cipher)
            val out = java.io.ByteArrayOutputStream()
            while (source.hasRemaining()) {
                app.clear()
                val r = engine.unwrap(source, app)
                if (r.status == SSLEngineResult.Status.BUFFER_OVERFLOW) {
                    app = ByteBuffer.allocate(app.capacity() * 2); continue
                }
                app.flip()
                out.write(ByteArray(app.remaining()).also { app.get(it) })
                if (r.bytesConsumed() == 0 && r.bytesProduced() == 0) break
            }
            return out.toByteArray()
        }
    }
    private class TrustAll : X509ExtendedTrustManager() {
        override fun checkClientTrusted(c: Array<out X509Certificate>?, a: String?) = Unit
        override fun checkClientTrusted(c: Array<out X509Certificate>?, a: String?, s: Socket?) = Unit
        override fun checkClientTrusted(c: Array<out X509Certificate>?, a: String?, e: SSLEngine?) = Unit
        override fun checkServerTrusted(c: Array<out X509Certificate>?, a: String?) = Unit
        override fun checkServerTrusted(c: Array<out X509Certificate>?, a: String?, s: Socket?) = Unit
        override fun checkServerTrusted(c: Array<out X509Certificate>?, a: String?, e: SSLEngine?) = Unit
        override fun getAcceptedIssuers(): Array<X509Certificate> = emptyArray()
    }
 }
@@ -0,0 +1,114 @@
 package app.seb3thehacker.gearslip
 import android.content.Context
 import java.io.File
 import org.json.JSONArray
 import org.json.JSONObject
 /** Pixels of the video frame the car UI keeps clear on each side (the frame is painted, just not used). */
 data class Insets(val top: Int = 0, val bottom: Int = 0, val left: Int = 0, val right: Int = 0) {
    companion object { val NONE = Insets() }
 }
 /**
 * Per-vehicle display tuning. Head units disagree about how they crop, offset and scale the
 * projected frame, so nothing here is applied unless a profile matches the connected unit.
 *
 * Profiles live in `vehicles.json` in the app's external files dir, so they can be edited and
 * pushed with adb without a rebuild:
 *
 *   adb push vehicles.json /sdcard/Android/data/app.seb3thehacker.gearslip/files/vehicles.json
 *
 * A profile matches when every key in [match] equals the head unit's value (case-insensitive);
 * keys it leaves out match anything. The first matching profile wins.
 */
 data class VehicleProfile(
    val name: String,
    val match: Map<String, String>,
    /** Preferred video resolution, e.g. "800x480". Null keeps the default choice. */
    val resolution: String?,
    val insets: Insets,
 )
 object VehicleProfiles {
    private const val FILE = "vehicles.json"
    private val DEFAULT_JSON = """
        {
          "_comment": "Per-vehicle display tuning. match keys: headUnitName, carModel, carYear, headUnitMake, headUnitModel (see the log line 'head unit: ...'). insets are pixels of the video frame to keep clear.",
          "vehicles": [
            {
              "name": "2018 Dodge Challenger (Uconnect 4)",
              "match": { "carModel": "Dodge Challenger", "headUnitName": "Uconnect" },
              "resolution": "800x480",
              "insets": { "top": 30, "bottom": 30, "left": 0, "right": 0 }
            }
          ]
        }
    """.trimIndent()
    /** Reads the file, writing the default one first if there is none so there is something to edit. */
    fun load(context: Context): List<VehicleProfile> {
        val file = context.getExternalFilesDir(null)?.let { File(it, FILE) } ?: return emptyList()
        if (!file.isFile) runCatching { file.writeText(DEFAULT_JSON) }
        return runCatching { parse(file.readText()) }
            .onFailure { GearslipLog.e("could not read $FILE - ignoring vehicle profiles", it) }
            .getOrDefault(emptyList())
    }
    /** Writes [insets] into the profile called [name] in the file, leaving everything else as it was. */
    fun saveInsets(context: Context, name: String, insets: Insets): Boolean {
        val file = context.getExternalFilesDir(null)?.let { File(it, FILE) } ?: return false
        return runCatching {
            val root = JSONObject(file.readText())
            val vehicles = root.getJSONArray("vehicles")
            var found = false
            for (i in 0 until vehicles.length()) {
                val v = vehicles.getJSONObject(i)
                if (v.optString("name") == name) {
                    v.put(
                        "insets",
                        JSONObject()
                            .put("top", insets.top).put("bottom", insets.bottom)
                            .put("left", insets.left).put("right", insets.right),
                    )
                    found = true
                }
            }
            if (found) file.writeText(root.toString(2))
            found
        }.onFailure { GearslipLog.e("could not save insets to $FILE", it) }.getOrDefault(false)
    }
    fun parse(json: String): List<VehicleProfile> {
        val vehicles: JSONArray = JSONObject(json).optJSONArray("vehicles") ?: return emptyList()
        return (0 until vehicles.length()).map { i ->
            val v = vehicles.getJSONObject(i)
            val match = v.optJSONObject("match")?.let { m -> m.keys().asSequence().associateWith { m.getString(it) } }
                ?: emptyMap()
            val ins = v.optJSONObject("insets")
            VehicleProfile(
                name = v.optString("name", "vehicle $i"),
                match = match,
                resolution = v.optString("resolution").ifEmpty { null },
                insets = if (ins == null) Insets.NONE else Insets(
                    ins.optInt("top"), ins.optInt("bottom"), ins.optInt("left"), ins.optInt("right"),
                ),
            )
        }
    }
    fun find(profiles: List<VehicleProfile>, info: ServiceDiscovery.HeadUnitInfo): VehicleProfile? {
        val values = mapOf(
            "headUnitName" to info.headUnitName,
            "carModel" to info.carModel,
            "carYear" to info.carYear,
            "headUnitMake" to info.headUnitMake,
            "headUnitModel" to info.headUnitModel,
        )
        return profiles.firstOrNull { p ->
            p.match.isNotEmpty() && p.match.all { (k, want) -> values[k].equals(want, ignoreCase = true) }
        }
    }
 }
@@ -0,0 +1,230 @@
 package app.seb3thehacker.gearslip
 import android.media.MediaCodec
 import android.media.MediaCodecInfo
 import android.media.MediaFormat
 import android.os.Bundle
 import android.media.Image
 import android.view.Surface
 /**
 * Encodes a generated test card to H.264 Baseline and hands the bitstream to a callback.
 *
 * Feeds the encoder YUV420 buffers via getInputImage() rather than a Surface: a MediaCodec
 * input Surface requires an EGL/OpenGL context to render into (Surface.lockCanvas is not
 * supported on it), and for a static test card that is a lot of machinery for no benefit.
 * Byte-buffer input keeps the spike dependency-free and fully deterministic. Phase C swaps
 * this for a real Surface + GL path when the source becomes a live WebView.
 *
 * The head unit negotiated MEDIA_CODEC_VIDEO_H264_BP, so the profile is pinned to Baseline.
 */
 class VideoSource(
    private val width: Int,
    private val height: Int,
    private val frameRate: Int,
    private val mode: Mode = Mode.TEST_CARD,
    private val onCodecConfig: (ByteArray) -> Unit,
    private val onFrame: (data: ByteArray, presentationTimeUs: Long, keyFrame: Boolean) -> Unit,
 ) {
    private val log = GearslipLog.tagged("VIDEO")
    /**
     * TEST_CARD feeds generated YUV buffers; SURFACE exposes a MediaCodec input Surface for
     * something else to render into (Phase C drives it from a VirtualDisplay + Presentation,
     * which is how Android screen mirroring works and avoids hand-written EGL entirely).
     */
    enum class Mode { TEST_CARD, SURFACE }
    /** Non-null in SURFACE mode once [start] has run. */
    var inputSurface: Surface? = null
        private set
    private var codec: MediaCodec? = null
    private var worker: Thread? = null
    @Volatile private var running = false
    private var frameIndex = 0L
    fun start() {
        val bitRate = (width.toLong() * height * frameRate * BITS_PER_PIXEL).toInt().coerceIn(MIN_BIT_RATE, MAX_BIT_RATE)
        fun format(tuned: Boolean) = MediaFormat.createVideoFormat(MIME, width, height).apply {
            setInteger(
                MediaFormat.KEY_COLOR_FORMAT,
                if (mode == Mode.SURFACE) {
                    MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface
                } else {
                    MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible
                },
            )
            setInteger(MediaFormat.KEY_BIT_RATE, bitRate)
            setInteger(MediaFormat.KEY_FRAME_RATE, frameRate)
            // Drops already ask for a fresh keyframe, so a long interval costs nothing in recovery
            // and spares the link a big frame every second.
            setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, I_FRAME_INTERVAL_S)
            setInteger(MediaFormat.KEY_PROFILE, MediaCodecInfo.CodecProfileLevel.AVCProfileBaseline)
            setInteger(MediaFormat.KEY_LEVEL, MediaCodecInfo.CodecProfileLevel.AVCLevel31)
            if (tuned) {
                // Hints only: a car screen wants each frame now, not the best frame a moment later.
                setInteger(MediaFormat.KEY_BITRATE_MODE, MediaCodecInfo.EncoderCapabilities.BITRATE_MODE_VBR)
                setInteger(MediaFormat.KEY_PRIORITY, 0)
                setInteger(MediaFormat.KEY_LATENCY, 1)
            }
        }
        var encoder = MediaCodec.createEncoderByType(MIME)
        try {
            encoder.configure(format(tuned = true), null, null, MediaCodec.CONFIGURE_FLAG_ENCODE)
        } catch (e: Exception) {
            // Some encoders refuse a hint they don't know. The plain format is what always worked.
            log.w("encoder refused the tuned format (${e.message}) - using the plain one")
            encoder.release()
            encoder = MediaCodec.createEncoderByType(MIME)
            encoder.configure(format(tuned = false), null, null, MediaCodec.CONFIGURE_FLAG_ENCODE)
        }
        if (mode == Mode.SURFACE) inputSurface = encoder.createInputSurface()
        encoder.start()
        codec = encoder
        running = true
        log.i("encoder started: ${width}x$height @ ${frameRate}fps, ${bitRate / 1000} kbps, H.264 Baseline, mode=$mode")
        worker = Thread {
            runCatching { pump(encoder) }
                .onFailure { if (running) log.e("encoder loop failed", it) }
        }.apply { name = "gearslip-encoder"; start() }
    }
    /**
     * Forces the next encoded frame to be a full keyframe (IDR) rather than a P-frame.
     *
     * Needed whenever a frame gets dropped between us and the head unit: every frame after
     * the drop is a P-frame that assumes the decoder still has the reference picture we
     * never delivered. Without a resync, the decoder free-runs on a corrupted reference
     * forever - visually, exactly the smeared/ghosted look of a partial e-ink refresh,
     * because nothing ever forces a clean full-frame redraw.
     */
    fun requestSyncFrame() {
        runCatching {
            codec?.setParameters(Bundle().apply {
                putInt(MediaCodec.PARAMETER_KEY_REQUEST_SYNC_FRAME, 0)
            })
        }.onFailure { log.w("requestSyncFrame failed: ${it.message}") }
    }
    fun stop() {
        running = false
        worker?.join(1_000)
        runCatching { inputSurface?.release() }
        inputSurface = null
        runCatching { codec?.stop() }
        runCatching { codec?.release() }
        codec = null
    }
    private fun pump(encoder: MediaCodec) {
        val info = MediaCodec.BufferInfo()
        val frameIntervalUs = 1_000_000L / frameRate
        while (running) {
            // SURFACE mode has no input buffers to fill - frames arrive from the display.
            val inIndex = if (mode == Mode.SURFACE) -1 else encoder.dequeueInputBuffer(TIMEOUT_US)
            if (inIndex >= 0) {
                val image = encoder.getInputImage(inIndex)
                if (image != null) {
                    drawTestCard(image, frameIndex)
                    encoder.queueInputBuffer(
                        inIndex, 0, width * height * 3 / 2, frameIndex * frameIntervalUs, 0,
                    )
                } else {
                    encoder.queueInputBuffer(inIndex, 0, 0, frameIndex * frameIntervalUs, 0)
                }
                frameIndex++
            }
            // A surface-fed encoder has nothing to do between frames, so block until one is ready
            // instead of sleeping a fixed time: less delay on screen, fewer wakeups for the CPU.
            val wait = if (mode == Mode.SURFACE) SURFACE_TIMEOUT_US else TIMEOUT_US
            var outIndex = encoder.dequeueOutputBuffer(info, wait)
            while (outIndex >= 0) {
                val buffer = encoder.getOutputBuffer(outIndex)
                if (buffer != null && info.size > 0) {
                    val data = ByteArray(info.size)
                    buffer.position(info.offset)
                    buffer.get(data)
                    if (info.flags and MediaCodec.BUFFER_FLAG_CODEC_CONFIG != 0) {
                        onCodecConfig(data)
                    } else {
                        onFrame(
                            data,
                            info.presentationTimeUs,
                            info.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0,
                        )
                    }
                }
                encoder.releaseOutputBuffer(outIndex, false)
                outIndex = encoder.dequeueOutputBuffer(info, 0)
            }
            if (mode != Mode.SURFACE) Thread.sleep(maxOf(1L, frameIntervalUs / 2000))
        }
    }
    /**
     * Colour bars with a bar that advances each second, so the car screen shows something
     * unmistakably ours and obviously live rather than a frozen or stale frame.
     */
    private fun drawTestCard(image: Image, frame: Long) {
        val yPlane = image.planes[0]
        val uPlane = image.planes[1]
        val vPlane = image.planes[2]
        val bars = BAR_COLOURS.size
        val barHeight = maxOf(1, height / bars)
        val marker = ((frame / frameRate) % bars).toInt()
        val yBuf = yPlane.buffer
        val yStride = yPlane.rowStride
        for (row in 0 until height) {
            val bar = minOf(bars - 1, row / barHeight)
            val (luma, _, _) = BAR_COLOURS[bar]
            val value = if (bar == marker) 235 else luma
            val base = row * yStride
            for (col in 0 until width) {
                yBuf.put(base + col, value.toByte())
            }
        }
        val uBuf = uPlane.buffer
        val vBuf = vPlane.buffer
        for (row in 0 until height / 2) {
            val bar = minOf(bars - 1, (row * 2) / barHeight)
            val (_, cb, cr) = BAR_COLOURS[bar]
            for (col in 0 until width / 2) {
                uBuf.put(row * uPlane.rowStride + col * uPlane.pixelStride, cb.toByte())
                vBuf.put(row * vPlane.rowStride + col * vPlane.pixelStride, cr.toByte())
            }
        }
    }
    private companion object {
        const val MIME = MediaFormat.MIMETYPE_VIDEO_AVC
        const val TIMEOUT_US = 10_000L
        const val SURFACE_TIMEOUT_US = 100_000L
        /** Enough for sharp text and map lines; 800x480 at 30fps comes out at 4 Mbps. */
        const val BITS_PER_PIXEL = 0.3
        const val MIN_BIT_RATE = 4_000_000
        const val MAX_BIT_RATE = 12_000_000
        const val I_FRAME_INTERVAL_S = 5
        /** (Y, Cb, Cr) - white, yellow, cyan, green, magenta, red, blue. */
        val BAR_COLOURS = listOf(
            Triple(180, 128, 128),
            Triple(162, 44, 142),
            Triple(131, 156, 44),
            Triple(112, 72, 58),
            Triple(84, 184, 198),
            Triple(65, 100, 212),
            Triple(35, 212, 114),
        )
    }
 }
@@ -0,0 +1,268 @@
 package app.seb3thehacker.gearslip.audio
 import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.PendingIntent
 import android.app.Service
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
 import android.content.pm.ServiceInfo
 import android.media.AudioAttributes
 import android.media.AudioFormat
 import android.media.AudioPlaybackCaptureConfiguration
 import android.media.AudioRecord
 import android.media.projection.MediaProjection
 import android.media.projection.MediaProjectionManager
 import android.os.IBinder
 import app.seb3thehacker.gearslip.GearslipLog
 import kotlin.math.abs
 /**
 * Hears one app's audio so it can be played on the car.
 *
 * Playback capture is the one public route to another app's sound, and it hangs off a
 * MediaProjection - so, as with [app.seb3thehacker.gearslip.mirror.MirrorService], the consent
 * result is carried into a foreground service of type mediaProjection before it can be redeemed.
 * Capture is scoped to media playback: notification pings, calls and alarms stay on the phone.
 * The grant lasts as long as this service does, which is as long as the car is connected, so the
 * driver answers the consent dialog once per drive rather than once per app.
 */
 class AudioCaptureService : Service() {
    @Volatile private var reading = false
    private var projection: MediaProjection? = null
    private var thread: Thread? = null
    private var mutedPhone = false
    /**
     * Silence the phone's own speaker while the car is being fed.
     *
     * Playback capture copies the stream instead of moving it, so without this the music plays in
     * two places at once. Muting the stream does not affect what is captured - the tap sits before
     * the volume the speaker gets - so the car still receives full-level audio.
     */
    private fun mutePhone() {
        if (mutedPhone) return
        runCatching {
            getSystemService(android.media.AudioManager::class.java)
                .adjustStreamVolume(android.media.AudioManager.STREAM_MUSIC, android.media.AudioManager.ADJUST_MUTE, 0)
            mutedPhone = true
            GearslipLog.i("audio: muted the phone's speaker for the drive")
        }.onFailure { GearslipLog.w("audio: could not mute the phone: ${it.message}") }
    }
    private fun unmutePhone() {
        if (!mutedPhone) return
        mutedPhone = false
        runCatching {
            getSystemService(android.media.AudioManager::class.java)
                .adjustStreamVolume(android.media.AudioManager.STREAM_MUSIC, android.media.AudioManager.ADJUST_UNMUTE, 0)
            GearslipLog.i("audio: gave the phone's speaker back")
        }.onFailure { GearslipLog.w("audio: could not unmute the phone: ${it.message}") }
    }
    override fun onBind(intent: Intent?): IBinder? = null
    override fun onCreate() {
        super.onCreate()
        running = true
    }
    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        if (intent?.action == ACTION_STOP) {
            stopSelf()
            return START_NOT_STICKY
        }
        val resultCode = intent?.getIntExtra(EXTRA_RESULT_CODE, 0) ?: 0
        val data = intent?.getParcelableExtra(EXTRA_RESULT_DATA, Intent::class.java)
        if (data == null) {
            GearslipLog.e("audio: started without a consent result")
            CarAudio.denied()
            stopSelf()
            return START_NOT_STICKY
        }
        // Android silences the microphone for apps in the background unless a running service
        // claims it. Claiming it here lets voice replies hear the driver with the phone locked.
        // Without the permission, claiming it would crash, so it's left off.
        val micGranted = checkSelfPermission(android.Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED
        val type = ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION or
            (if (micGranted) ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE else 0)
        startForeground(NOTIFICATION_ID, notification(), type)
        ScreenShareGuard.lift(this)
        projection = try {
            getSystemService(MediaProjectionManager::class.java).getMediaProjection(resultCode, data)
        } catch (t: Throwable) {
            GearslipLog.e("audio: getMediaProjection failed", t)
            null
        }
        val token = projection
        if (token == null) {
            CarAudio.denied()
            stopSelf()
            return START_NOT_STICKY
        }
        token.registerCallback(object : MediaProjection.Callback() {
            override fun onStop() {
                GearslipLog.w("audio: projection stopped")
                stopSelf()
            }
        }, null)
        beginCapture(token)
        return START_NOT_STICKY
    }
    private fun beginCapture(token: MediaProjection) {
        val rate = CarAudio.sampleRate
        val channels = CarAudio.channels
        val record = try {
            // Matched by usage, not by app. A uid filter would have to be rebuilt every time the
            // driver changed media app, and rebuilding means a fresh consent dialog - so the
            // filter is what the sound is for, and any app playing media reaches the car.
            val config = AudioPlaybackCaptureConfiguration.Builder(token)
                .addMatchingUsage(AudioAttributes.USAGE_MEDIA)
                .addMatchingUsage(AudioAttributes.USAGE_GAME)
                .addMatchingUsage(AudioAttributes.USAGE_UNKNOWN)
                .build()
            val mask = if (channels == 1) AudioFormat.CHANNEL_IN_MONO else AudioFormat.CHANNEL_IN_STEREO
            val format = AudioFormat.Builder()
                .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
                .setSampleRate(rate)
                .setChannelMask(mask)
                .build()
            val minimum = AudioRecord.getMinBufferSize(rate, mask, AudioFormat.ENCODING_PCM_16BIT)
            AudioRecord.Builder()
                .setAudioPlaybackCaptureConfig(config)
                .setAudioFormat(format)
                .setBufferSizeInBytes(maxOf(minimum, CHUNK_BYTES * BUFFER_CHUNKS))
                .build()
        } catch (t: Throwable) {
            GearslipLog.e("audio: could not set up playback capture", t)
            CarAudio.denied()
            stopSelf()
            return
        }
        reading = true
        thread = Thread({
            val buffer = ByteArray(CHUNK_BYTES)
            var peak = 0
            var heardAt = System.currentTimeMillis()
            val startedAt = heardAt
            var everHeard = false
            var warnedSilent = false
            try {
                record.startRecording()
                GearslipLog.i("audio: capturing media playback at ${rate}Hz x$channels")
                mutePhone()
                CarAudio.captureStarted()
                while (reading) {
                    val n = record.read(buffer, 0, buffer.size)
                    if (n <= 0) {
                        GearslipLog.e("audio: AudioRecord.read returned $n - capture has stopped")
                        break
                    }
                    for (i in 0 until n - 1 step 2) {
                        val sample = (buffer[i].toInt() and 0xFF) or (buffer[i + 1].toInt() shl 8)
                        peak = maxOf(peak, abs(sample.toShort().toInt()))
                    }
                    if (peak > 0) everHeard = true
                    val now = System.currentTimeMillis()
                    val level = peak / 32768f
                    if (now - heardAt >= LEVEL_LOG_MS) {
                        GearslipLog.i("audio: peak %.3f".format(level))
                        heardAt = now
                        peak = 0
                    }
                    // Capture never fails for an app that opts out; it just hands back digital
                    // silence. Say so, because the symptom is identical to a broken car link.
                    if (!everHeard && !warnedSilent && now - startedAt >= SILENCE_MS) {
                        warnedSilent = true
                        GearslipLog.w(
                            "audio: ${SILENCE_MS / 1000}s of capture and every sample is zero. " +
                                "Either nothing is playing, or the app does not allow its audio " +
                                "to be captured.",
                        )
                    }
                    CarAudio.deliver(buffer, n, level)
                }
            } catch (t: Throwable) {
                GearslipLog.e("audio: capture loop ended", t)
            } finally {
                runCatching { record.stop() }
                record.release()
                unmutePhone()
                CarAudio.captureStopped()
            }
        }, "gearslip-audio").apply { isDaemon = true; start() }
    }
    override fun onDestroy() {
        super.onDestroy()
        reading = false
        runCatching { thread?.join(500) }
        // Belt and braces: a phone left muted after the drive is a bug the driver blames on their
        // phone, not on Gearslip, so unmute on every way out of here.
        unmutePhone()
        runCatching { projection?.stop() }
        projection = null
        ScreenShareGuard.restore(this)
        running = false
    }
    private fun notification(): Notification {
        val manager = getSystemService(NotificationManager::class.java)
        manager.createNotificationChannel(
            NotificationChannel(CHANNEL, "Car audio", NotificationManager.IMPORTANCE_LOW),
        )
        val stop = PendingIntent.getService(
            this, 0,
            Intent(this, AudioCaptureService::class.java).setAction(ACTION_STOP),
            PendingIntent.FLAG_IMMUTABLE,
        )
        return Notification.Builder(this, CHANNEL)
            .setContentTitle("Playing to the car")
            .setContentText("Gearslip is sending a media app's audio to the car.")
            .setSmallIcon(android.R.drawable.ic_lock_silent_mode_off)
            .setOngoing(true)
            .addAction(Notification.Action.Builder(null, "Stop", stop).build())
            .build()
    }
    companion object {
        private const val CHANNEL = "gearslip_audio"
        private const val NOTIFICATION_ID = 43
        private const val ACTION_STOP = "app.seb3thehacker.gearslip.STOP_AUDIO"
        private const val EXTRA_RESULT_CODE = "resultCode"
        private const val EXTRA_RESULT_DATA = "resultData"
        /** About 21 ms of 48 kHz stereo: small enough for lip-sync, big enough not to flood the link. */
        private const val CHUNK_BYTES = 4096
        /** About half a second: room to wait out a slow ack from the car without losing sound. */
        private const val BUFFER_CHUNKS = 24
        private const val LEVEL_LOG_MS = 3_000L
        private const val SILENCE_MS = 5_000L
        private var appContext: Context? = null
        /** True between onCreate and onDestroy; lets the activity tell a live capture from a crashed one. */
        @Volatile var running = false
            private set
        fun start(context: Context, resultCode: Int, data: Intent) {
            appContext = context.applicationContext
            context.startForegroundService(
                Intent(context, AudioCaptureService::class.java)
                    .putExtra(EXTRA_RESULT_CODE, resultCode)
                    .putExtra(EXTRA_RESULT_DATA, data),
            )
        }
        fun stop() {
            val context = appContext ?: return
            context.startService(Intent(context, AudioCaptureService::class.java).setAction(ACTION_STOP))
        }
    }
 }
@@ -0,0 +1,260 @@
 package app.seb3thehacker.gearslip.audio
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.Protobuf
 import app.seb3thehacker.gearslip.ServiceDiscovery
 import app.seb3thehacker.gearslip.Wire
 /**
 * The phone end of the head unit's media audio sink, the audio twin of the video channel:
 *
 *   -> CHANNEL_OPEN_REQUEST   <- CHANNEL_OPEN_RESPONSE
 *   -> Setup { PCM }          <- Config { status, max_unacked, configuration_indices }
 *   -> AudioFocusRequest      <- AudioFocusResponse           (control channel)
 *   -> Start { session_id, configuration_index }
 *   -> Data { 8-byte timestamp, PCM }...   <- Ack { session_id, ack }
 *   -> Stop
 *
 * Inverted from aasdk's AudioMediaSinkService. Bench-verified only as far as capture goes:
 * nothing on this side of the wire has met a head unit yet.
 */
 class AudioLink(
    private val service: ServiceDiscovery.AudioService,
    private val sendOnChannel: (messageId: Int, body: ByteArray) -> Unit,
    private val sendControl: (messageId: Int, body: ByteArray) -> Unit,
 ) : CarAudio.Link {
    private var configIndex = 0
    @Volatile private var ready = false
    @Volatile private var started = false
    @Volatile private var focusGranted = false
    @Volatile private var focusRequested = false
    @Volatile private var inFlight = 0
    // The Uconnect asks for 4 on its video channel; assume the same until its Config says otherwise.
    @Volatile private var maxUnacked = 4
    @Volatile private var lastAckAt = 0L
    private var chunks = 0
    private var bytes = 0L
    private var dropped = 0
    @Volatile private var configTimer: Thread? = null
    private val ackLock = Object()
    private val config get() = service.configs.getOrNull(configIndex) ?: service.configs.firstOrNull()
    override val sampleRate get() = config?.sampleRate ?: 48_000
    override val channels get() = config?.channels ?: 2
    val channelId get() = service.serviceId
    fun opened(status: Int) {
        GearslipLog.i("audio: <- ChannelOpenResponse (media audio): status=$status")
        if (status != 0) {
            GearslipLog.w("audio: the head unit refused the media audio channel (status $status)")
            return
        }
        // AVChannelSetupRequest { required uint32 config_index = 1 }. This field is an index into
        // the sink's own audio_configs, not a codec id - sending the codec type asks for a config
        // the sink does not have, and it answers with a status that never reaches READY.
        sendOnChannel(MSG_SETUP, Protobuf.varintField(1, 0L))
        GearslipLog.i("audio: -> Setup(config_index=0) on channel ${service.serviceId}, codec ${service.codecName}")
        armConfigFallback()
    }
    /**
     * The 2018 Uconnect answers our Setup with a two-byte message we cannot identify (id 255, no
     * body) rather than the AVChannelSetupResponse the video channel gets, so the sink never
     * reaches READY and no audio is ever sent.
     *
     * Service discovery already told us everything that message would have: the sink is PCM at
     * 48000Hz stereo and it has exactly one configuration. So rather than wait forever for a
     * message that is not coming, assume the advertised configuration and carry on. If that guess
     * is wrong the head unit simply will not ack, which the write path already reports.
     */
    private fun armConfigFallback() {
        val timer = Thread({
            try {
                Thread.sleep(CONFIG_WAIT_MS)
            } catch (e: InterruptedException) {
                return@Thread
            }
            if (ready) return@Thread
            GearslipLog.w(
                "audio: no usable Config after ${CONFIG_WAIT_MS}ms - falling back to the sink the " +
                    "head unit advertised (${sampleRate}Hz x$channels, config_index=0, max_unacked=$maxUnacked)",
            )
            configIndex = 0
            ready = true
            CarAudio.attach(this)
        }, "gearslip-audio-config").apply { isDaemon = true }
        configTimer = timer
        timer.start()
    }
    fun onMessage(messageId: Int, body: ByteArray) {
        when (messageId) {
            MSG_CHANNEL_OPEN_RESPONSE -> opened(Protobuf.readInt32Field(body, 1) ?: 0)
            MSG_CONFIG -> {
                val fields = Wire.fields(body)
                val status = Wire.varint(fields, 1)?.toInt()
                val window = Wire.varint(fields, 2)?.toInt()
                val indices = fields.filter { it.number == 3 && it.wireType == 0 }.map { it.varint.toInt() }
                GearslipLog.i("audio: <- Config status=$status max_unacked=$window indices=$indices")
                if (window != null) maxUnacked = maxOf(1, window)
                configIndex = indices.firstOrNull() ?: 0
                if (status == STATUS_READY) {
                    configTimer?.interrupt()
                    ready = true
                    GearslipLog.i("audio: sink ready - ${sampleRate}Hz x$channels ${config?.bits}bit")
                    CarAudio.attach(this)
                } else {
                    GearslipLog.w(
                        "audio: the sink is not ready (status=$status, 1=WAIT 2=READY) - " +
                            "nothing will be sent until it is",
                    )
                }
            }
            MSG_ACK -> {
                val acked = Wire.varint(Wire.fields(body), 2)?.toInt() ?: 1
                synchronized(ackLock) {
                    inFlight = maxOf(0, inFlight - maxOf(1, acked))
                    lastAckAt = System.currentTimeMillis()
                    ackLock.notifyAll()
                }
            }
            // Whatever the head unit answers Setup with, we need its bytes to identify it.
            else -> {
                GearslipLog.i("audio: <- unhandled message id=$messageId (${body.size} bytes)")
                GearslipLog.hex("   audio msg", body, limit = 64)
            }
        }
    }
    /**
     * The head unit's answer to our AudioFocusRequest. Until it grants focus the sink is wired to
     * whatever else the car is playing - the radio, usually - and anything we send is discarded,
     * so [start] waits here rather than streaming into nothing.
     */
    fun onFocus(state: Int) {
        val name = FOCUS_STATES[state] ?: "unknown($state)"
        GearslipLog.i("audio: <- AudioFocusResponse state=$name")
        focusGranted = state == FOCUS_STATE_GAIN || state == FOCUS_STATE_GAIN_TRANSIENT
        if (focusGranted) startStream() else stop()
    }
    override fun start() {
        if (!ready || started) return
        if (!focusRequested) {
            focusRequested = true
            sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_GAIN.toLong()))
            GearslipLog.i("audio: -> AudioFocusRequest(GAIN); waiting for the head unit to hand the sink over")
        }
        // Some head units grant the sink silently and never answer. Do not let that be the end of
        // it: start anyway, and let the acks say whether anything is being taken.
        startStream()
    }
    private fun startStream() {
        if (!ready || started) return
        sendOnChannel(
            MSG_START,
            Protobuf.varintField(1, SESSION_ID.toLong()) + Protobuf.varintField(2, configIndex.toLong()),
        )
        inFlight = 0
        lastAckAt = System.currentTimeMillis()
        started = true
        GearslipLog.i("audio: -> Start(session=$SESSION_ID, config=$configIndex) - streaming ${sampleRate}Hz x$channels")
    }
    override fun stop() {
        if (!started) return
        started = false
        synchronized(ackLock) { ackLock.notifyAll() }
        runCatching {
            sendOnChannel(MSG_STOP, Protobuf.varintField(1, SESSION_ID.toLong()))
            if (focusRequested) sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_RELEASE.toLong()))
        }
        focusRequested = false
        focusGranted = false
        GearslipLog.i("audio: -> Stop, AudioFocusRequest(RELEASE) after $chunks chunks / $bytes bytes")
        chunks = 0
        bytes = 0
    }
    override fun write(pcm: ByteArray, size: Int) {
        if (!started) return
        // Wait for the car to catch up rather than throw the chunk away: a dropped chunk is a gap
        // the driver hears, while a short wait is soaked up by the capture buffer behind us.
        synchronized(ackLock) {
            while (started && inFlight >= maxUnacked) {
                val waited = System.currentTimeMillis() - lastAckAt
                if (waited > STALL_MS) {
                    // A lost ack must not silence the stream for good; after a stall assume the window cleared.
                    GearslipLog.w("audio: no ack for ${STALL_MS}ms with $inFlight in flight - reopening the window")
                    inFlight = 0
                    break
                }
                ackLock.wait(STALL_MS - waited + 1)
            }
        }
        if (!started) {
            dropped++
            return
        }
        val timestamp = ByteArray(8)
        val micros = System.nanoTime() / 1_000
        for (i in 0 until 8) timestamp[i] = ((micros shr ((7 - i) * 8)) and 0xFF).toByte()
        try {
            sendOnChannel(MSG_DATA, timestamp + pcm.copyOf(size))
        } catch (e: java.io.IOException) {
            GearslipLog.e("audio: the link died mid-stream", e)
            started = false
            return
        }
        synchronized(ackLock) { inFlight++ }
        chunks++
        bytes += size
        // The first chunk proves the whole path; after that, an occasional line is enough to show
        // the car is still taking audio and to catch a window that has quietly closed.
        if (chunks == 1 || chunks % CHUNK_LOG_EVERY == 0) {
            GearslipLog.i(
                "audio: -> $chunks chunks / $bytes bytes, inFlight=$inFlight/$maxUnacked, " +
                    "dropped=$dropped, focus=${if (focusGranted) "granted" else "not granted"}",
            )
        }
    }
    fun close() {
        configTimer?.interrupt()
        configTimer = null
        stop()
        ready = false
        CarAudio.detach(this)
    }
    companion object {
        const val MSG_FOCUS_REQUEST = 18
        const val MSG_FOCUS_RESPONSE = 19
        private const val MSG_CHANNEL_OPEN_RESPONSE = 8
        private const val MSG_DATA = 0
        private const val MSG_SETUP = 32768
        private const val MSG_START = 32769
        private const val MSG_STOP = 32770
        private const val MSG_CONFIG = 32771
        private const val MSG_ACK = 32772
        private const val STATUS_READY = 2
        private const val FOCUS_GAIN = 1
        private const val FOCUS_RELEASE = 4
        private const val FOCUS_STATE_GAIN = 1
        private const val FOCUS_STATE_GAIN_TRANSIENT = 2
        private const val SESSION_ID = 2
        private const val STALL_MS = 2_000L
        private const val CHUNK_LOG_EVERY = 200 // about every four seconds
        private const val CONFIG_WAIT_MS = 2_500L
        private val FOCUS_STATES = mapOf(
            1 to "GAIN", 2 to "GAIN_TRANSIENT", 3 to "LOSS", 4 to "LOSS_TRANSIENT",
        )
    }
 }
@@ -0,0 +1,118 @@
 package app.seb3thehacker.gearslip.audio
 import app.seb3thehacker.gearslip.GearslipLog
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 /**
 * Joins the two ends of the audio path: [AudioCaptureService] on the phone, which hears what the
 * phone is playing, and the car's audio channel, which is where it has to end up.
 *
 * Capture belongs to the car session, not to any one app. Android grants it through a consent
 * dialog that cannot be answered in advance or remembered, so Gearslip asks once, when a head unit
 * first offers a sink to play through, and then holds that grant for as long as the car is
 * connected. Switching between media apps, or starting playback from the phone, costs nothing
 * further: the capture is by audio usage rather than by app, so whatever the phone plays as media
 * goes to the car.
 */
 object CarAudio {
    /** What the head unit's media sink accepts, and how to hand it audio. */
    interface Link {
        val sampleRate: Int
        val channels: Int
        fun start()
        fun stop()
        fun write(pcm: ByteArray, size: Int)
    }
    enum class Capture { OFF, ASKING, ON, DENIED }
    private val _capture = MutableStateFlow(Capture.OFF)
    val capture: StateFlow<Capture> = _capture.asStateFlow()
    /** "-12 dB" style summary of what was last heard, for the media screen. */
    private val _level = MutableStateFlow(0f)
    val level: StateFlow<Float> = _level.asStateFlow()
    /** Set by the activity: shows the permission and consent dialogs, which only it can. */
    var onConsentRequested: (() -> Unit)? = null
    /** Whether the driver has asked for the car to be fed at all; see CarSettings.pipeAudio. */
    @Volatile private var wanted = false
    @Volatile private var link: Link? = null
    /** Rate and channel count the capture should use: the car's, or a sensible default. */
    val sampleRate get() = link?.sampleRate ?: 48_000
    val channels get() = link?.channels ?: 2
    fun attach(link: Link) {
        this.link = link
        GearslipLog.i("audio: the car offered a sink at ${link.sampleRate}Hz x${link.channels}")
        when {
            _capture.value == Capture.ON -> link.start()
            wanted -> ask()
        }
    }
    fun detach(link: Link) {
        if (this.link === link) this.link = null
    }
    /**
     * The car wants sound. Safe to call as often as the session likes: the consent dialog appears
     * at most once, and only once there is a sink to play through - asking on the bench, where the
     * sound has nowhere to go, would put a system dialog in front of the driver for nothing.
     */
    fun request() {
        wanted = true
        when (_capture.value) {
            Capture.ON, Capture.ASKING, Capture.DENIED -> return
            Capture.OFF -> if (link == null) {
                GearslipLog.i("audio: waiting for the car to offer an audio sink")
            } else {
                ask()
            }
        }
    }
    private fun ask() {
        _capture.value = Capture.ASKING
        val request = onConsentRequested
        if (request == null) {
            GearslipLog.w("audio: nothing on the phone can ask for capture consent")
            _capture.value = Capture.DENIED
        } else {
            request()
        }
    }
    /** The car went away. Everything is torn down; the next connection asks again. */
    fun release() {
        wanted = false
        AudioCaptureService.stop()
        _capture.value = Capture.OFF
    }
    fun denied() {
        _capture.value = Capture.DENIED
    }
    internal fun captureStarted() {
        _capture.value = Capture.ON
        link?.start()
    }
    internal fun captureStopped() {
        link?.stop()
        _level.value = 0f
        if (_capture.value == Capture.ON) _capture.value = Capture.OFF
    }
    internal fun deliver(pcm: ByteArray, size: Int, peak: Float) {
        _level.value = peak
        link?.write(pcm, size)
    }
 }
@@ -0,0 +1,64 @@
 package app.seb3thehacker.gearslip.audio
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
 import android.provider.Settings
 import app.seb3thehacker.gearslip.GearslipLog
 /**
 * Keeps the phone's notifications readable while audio is being sent to the car.
 *
 * Playback capture hangs off a MediaProjection, and since Android 15 any full-screen projection
 * makes SystemUI hide notification contents, on the assumption that someone is watching the
 * screen. Nobody is: the audio projection never makes a display. The one exemption an ordinary app
 * can reach is the developer setting that switches the protection off, so Gearslip turns it off for
 * the length of the capture and back on afterwards.
 *
 * Writing it needs WRITE_SECURE_SETTINGS, granted once over adb. Without the grant this does
 * nothing and notifications stay hidden while music plays, which is the platform's default.
 *
 * Phone mirroring deliberately does not use this: there the screen really is being shown.
 */
 internal object ScreenShareGuard {
    /** Settings.Global.DISABLE_SCREEN_SHARE_PROTECTIONS_FOR_APPS_AND_NOTIFICATIONS, hidden API. */
    private const val SETTING = "disable_screen_share_protections_for_apps_and_notifications"
    private const val PREFS = "gearslip_screen_share_guard"
    /** Set while Gearslip has the protection switched off, so a crash can be undone at next launch. */
    private const val KEY_LIFTED = "lifted"
    fun canLift(context: Context): Boolean =
        context.checkSelfPermission(Manifest.permission.WRITE_SECURE_SETTINGS) ==
            PackageManager.PERMISSION_GRANTED
    /** Call before the projection starts: the system decides what to hide at that moment. */
    fun lift(context: Context) {
        if (!canLift(context)) {
            GearslipLog.i("audio: notifications will be hidden while capturing (no WRITE_SECURE_SETTINGS)")
            return
        }
        val resolver = context.contentResolver
        // Already off, whether by the driver in Developer options or by us: leave it as found.
        if (Settings.Global.getInt(resolver, SETTING, 0) != 0) return
        runCatching {
            prefs(context).edit().putBoolean(KEY_LIFTED, true).commit()
            Settings.Global.putInt(resolver, SETTING, 1)
            GearslipLog.i("audio: screen share protection off for the drive, notifications stay visible")
        }.onFailure { GearslipLog.w("audio: could not lift screen share protection: ${it.message}") }
    }
    /** Put the protection back, if Gearslip is the one that took it away. */
    fun restore(context: Context) {
        if (!prefs(context).getBoolean(KEY_LIFTED, false)) return
        runCatching {
            Settings.Global.putInt(context.contentResolver, SETTING, 0)
            prefs(context).edit().remove(KEY_LIFTED).commit()
            GearslipLog.i("audio: screen share protection back on")
        }.onFailure { GearslipLog.w("audio: could not restore screen share protection: ${it.message}") }
    }
    private fun prefs(context: Context) =
        context.applicationContext.getSharedPreferences(PREFS, Context.MODE_PRIVATE)
 }
@@ -0,0 +1,135 @@
 package app.seb3thehacker.gearslip.call
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Handler
 import android.os.Looper
 import android.provider.ContactsContract
 import android.telecom.TelecomManager
 import android.telephony.TelephonyCallback
 import android.telephony.TelephonyManager
 import app.seb3thehacker.gearslip.GearslipLog
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 /** A caller as the car shows it: whatever the contacts app knows, or just the number. */
 data class Caller(val number: String, val name: String?) {
    val label: String get() = name ?: number.ifBlank { "Unknown number" }
 }
 sealed interface CallUiState {
    data object None : CallUiState
    data class Ringing(val caller: Caller, val canDecline: Boolean) : CallUiState
    data class Active(val caller: Caller?) : CallUiState
 }
 /**
 * Tracks the phone's call state for the car screen, and answers or declines through the two
 * doors a sideloaded app can use: [android.telecom.TelecomManager.acceptRingingCall] to answer,
 * and [GearslipCallScreening]'s response to decline one that is still ringing.
 *
 * Ending a call already answered needs MODIFY_PHONE_STATE, a privileged permission Gearslip
 * cannot hold, so a call taken here is finished the way it would be without Gearslip at all -
 * from the phone itself, a paired headset, or the car's own Bluetooth if it has any. Call audio
 * stays on the phone's normal voice path too; nothing here sends it over the USB link, which
 * only ever carries media playback.
 */
 object CarCalls {
    private val _state = MutableStateFlow<CallUiState>(CallUiState.None)
    val state: StateFlow<CallUiState> = _state.asStateFlow()
    private var telephony: TelephonyManager? = null
    private var watcher: TelephonyCallback? = null
    private var pendingRespond: ((allow: Boolean) -> Unit)? = null
    private var ringingCaller: Caller? = null
    fun start(context: Context) {
        if (watcher != null) return
        if (context.checkSelfPermission(Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) return
        val manager = context.getSystemService(TelephonyManager::class.java) ?: return
        val callback = object : TelephonyCallback(), TelephonyCallback.CallStateListener {
            override fun onCallStateChanged(state: Int) = onPhoneState(state)
        }
        runCatching { manager.registerTelephonyCallback(context.mainExecutor, callback) }
            .onSuccess { telephony = manager; watcher = callback }
            .onFailure { GearslipLog.w("calls: could not watch call state: ${it.message}") }
    }
    fun stop() {
        val callback = watcher ?: return
        runCatching { telephony?.unregisterTelephonyCallback(callback) }
        telephony = null
        watcher = null
        pendingRespond = null
        ringingCaller = null
        _state.value = CallUiState.None
    }
    private fun onPhoneState(state: Int) {
        when (state) {
            TelephonyManager.CALL_STATE_IDLE -> {
                pendingRespond = null
                ringingCaller = null
                _state.value = CallUiState.None
            }
            TelephonyManager.CALL_STATE_OFFHOOK -> {
                pendingRespond = null
                _state.value = CallUiState.Active(ringingCaller)
            }
            TelephonyManager.CALL_STATE_RINGING -> {
                // The number itself only ever arrives through the screening service; if this
                // fires first, the ringing card appears once incomingCall() catches up.
                ringingCaller?.let { _state.value = CallUiState.Ringing(it, pendingRespond != null) }
            }
        }
    }
    /** Called by [GearslipCallScreening] the moment a call comes in - the only place with a number. */
    fun incomingCall(context: Context, number: String?, respond: (allow: Boolean) -> Unit) {
        val caller = Caller(number.orEmpty(), number?.let { lookUpName(context, it) })
        ringingCaller = caller
        pendingRespond = respond
        _state.value = CallUiState.Ringing(caller, canDecline = true)
    }
    /** The screening window closed by itself - the call rings normally now, and can't be declined from here. */
    fun screeningExpired() {
        pendingRespond = null
        val caller = ringingCaller ?: return
        if (_state.value is CallUiState.Ringing) _state.value = CallUiState.Ringing(caller, canDecline = false)
    }
    fun decline() {
        val respond = pendingRespond ?: return
        pendingRespond = null
        runCatching { respond(false) }.onFailure { GearslipLog.w("calls: decline failed: ${it.message}") }
    }
    fun answer(context: Context) {
        if (context.checkSelfPermission(Manifest.permission.ANSWER_PHONE_CALLS) != PackageManager.PERMISSION_GRANTED) {
            GearslipLog.w("calls: answer needs ANSWER_PHONE_CALLS, which was never granted")
            return
        }
        val telecom = context.getSystemService(TelecomManager::class.java) ?: return
        runCatching { telecom.acceptRingingCall() }
            .onFailure { GearslipLog.w("calls: answer failed: ${it.message}") }
    }
    private fun lookUpName(context: Context, number: String): String? {
        if (context.checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) return null
        return runCatching {
            val uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number))
            context.contentResolver.query(uri, arrayOf(ContactsContract.PhoneLookup.DISPLAY_NAME), null, null, null)
                ?.use { c -> if (c.moveToFirst()) c.getString(0) else null }
        }.getOrNull()
    }
 }
 /** Posts to the main thread after a delay - used to give up on a screening response Gearslip never sent. */
 internal fun mainThreadDelay(ms: Long, action: () -> Unit) {
    Handler(Looper.getMainLooper()).postDelayed(action, ms)
 }
@@ -0,0 +1,53 @@
 package app.seb3thehacker.gearslip.call
 import android.telecom.Call
 import android.telecom.CallScreeningService
 import app.seb3thehacker.gearslip.GearslipLog
 /**
 * Sees every incoming call before it rings, so the car screen can show who is calling and
 * decline it in the same window a spam-blocker would use. Inert until the driver sets Gearslip
 * as the phone's caller ID and spam app - the same on-device consent Truecaller-style apps ask
 * for, not a privileged permission.
 *
 * The system gives an app a few seconds to answer before it lets the call ring on its own, so a
 * response is sent either when the driver taps a button or when that window is about to close,
 * whichever comes first. Answering a call that has already passed this point still works, since
 * [CarCalls.answer] goes through the ordinary ringing-call API rather than through screening.
 */
 class GearslipCallScreening : CallScreeningService() {
    override fun onScreenCall(callDetails: Call.Details) {
        val number = callDetails.handle?.schemeSpecificPart
        var responded = false
        val respond: (Boolean) -> Unit = { allow ->
            if (!responded) {
                responded = true
                runCatching {
                    respondToCall(
                        callDetails,
                        CallResponse.Builder()
                            .setDisallowCall(!allow)
                            .setRejectCall(!allow)
                            .setSkipNotification(false)
                            .build(),
                    )
                }.onFailure { GearslipLog.w("calls: screening response failed: ${it.message}") }
            }
        }
        CarCalls.incomingCall(applicationContext, number, respond)
        // Answer for the system if nobody has by the time its own patience runs out, so a call
        // Gearslip is slow to show never gets silently blocked.
        mainThreadDelay(SCREENING_WINDOW_MS) {
            respond(true)
            CarCalls.screeningExpired()
        }
    }
    private companion object {
        const val SCREENING_WINDOW_MS = 3_500L
    }
 }
@@ -0,0 +1,182 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import java.text.DateFormat
 import java.util.Date
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 /**
 * Turns what [CarAssistant] heard into an action plus something to say back.
 *
 * Deliberately small and keyword-matched rather than run through any NLU or bundled model: a
 * fixed set of things a driver actually wants hands-free (media, calling, opening an app,
 * getting back Home), covering the same ground the rest of the car UI already does rather than
 * trying to be a general assistant.
 */
 object AssistantCommands {
    suspend fun handle(context: Context, navigator: CarNavigator, frame: CarEnvironment.Frame, heardRaw: String): String {
        val heard = heardRaw.lowercase().trim()
        navigateCommand(context, navigator, frame, heard)?.let { return it }
        mediaCommand(heard)?.let { return it }
        navCommand(navigator, heard)?.let { return it }
        infoCommand(heard)?.let { return it }
        callCommand(context, heard)?.let { return it }
        openAppCommand(context, navigator, frame, heard)?.let { return it }
        return "I don't know how to do that yet."
    }
    /**
     * "navigate to X [with|using|on|via Y]" - Y picks the nav app by (partial) label; without it,
     * whichever nav app was used last, or the only one installed, or the first one found. Starts
     * it straight into navigating there via [CarAppConnection]'s `ACTION_NAVIGATE` deep link -
     * the same one Android Auto's own Assistant integration uses - rather than opening the app
     * and leaving the driver to type the address in on the car keyboard.
     */
    private suspend fun navigateCommand(
        context: Context,
        navigator: CarNavigator,
        frame: CarEnvironment.Frame,
        heard: String,
    ): String? {
        val trigger = NAVIGATE_TRIGGERS.firstOrNull { heard.startsWith(it) } ?: return null
        var destination = heard.removePrefix(trigger).trim()
        if (destination.isBlank()) return "Where to?"
        var appName: String? = null
        for (sep in listOf(" with ", " using ", " on ", " via ")) {
            val at = destination.lastIndexOf(sep)
            if (at > 0) {
                appName = destination.substring(at + sep.length).trim()
                destination = destination.substring(0, at).trim()
                break
            }
        }
        if (destination.isBlank()) return "Where to?"
        val entries = LauncherCache.entries ?: withContext(Dispatchers.IO) { LauncherCache.load(context) }
        val navApps = entries.filter { it.template?.isNavigation == true }
        if (navApps.isEmpty()) return "You don't have any navigation apps installed."
        val requestedApp = appName
        val chosen = when {
            requestedApp != null -> navApps.firstOrNull { it.label.lowercase().contains(requestedApp) }
                ?: return "I couldn't find a navigation app called $requestedApp."
            navApps.size == 1 -> navApps.first()
            else -> navApps.firstOrNull { it.componentId == CarSettings.lastNav.value } ?: navApps.first()
        }
        val template = chosen.template ?: return "That's not a navigation app."
        CarServices.connectNav(template, frame, destination)
        navigator.home()
        return "Navigating to $destination with ${chosen.label}."
    }
    private fun mediaCommand(heard: String): String? {
        val media = CarServices.media
        return when {
            "pause" in heard || heard.startsWith("stop") -> {
                if (media.now.value.playing) media.togglePlay()
                "Paused."
            }
            "resume" in heard || (heard.startsWith("play") && "playing" !in heard) -> {
                if (!media.now.value.playing) media.togglePlay()
                "Playing."
            }
            "next" in heard || "skip" in heard -> {
                media.next()
                "Skipping."
            }
            "previous" in heard || "last song" in heard || "back song" in heard -> {
                media.previous()
                "Playing the previous track."
            }
            "what" in heard && "playing" in heard -> {
                val now = media.now.value
                if (now.isActive) listOf(now.title, now.artist).filter { it.isNotBlank() }.joinToString(" by ")
                else "Nothing's playing."
            }
            else -> null
        }
    }
    private fun navCommand(navigator: CarNavigator, heard: String): String? = when {
        "go home" in heard || heard == "home" -> {
            navigator.home()
            "Heading home."
        }
        "open apps" in heard || heard == "apps" || "app list" in heard -> {
            navigator.apps()
            "Here are your apps."
        }
        "settings" in heard -> {
            navigator.settings()
            "Opening settings."
        }
        "vehicle data" in heard || "car data" in heard -> {
            if (CarSettings.experimentalFeaturesEnabled.value && CarSettings.carSensorsEnabled.value) {
                navigator.vehicleData()
                "Opening vehicle data."
            } else {
                "Vehicle data is off. Turn it on under experimental features in settings."
            }
        }
        else -> null
    }
    private fun infoCommand(heard: String): String? = when {
        "what time" in heard || "what's the time" in heard ->
            "It's ${DateFormat.getTimeInstance(DateFormat.SHORT).format(Date())}."
        "weather" in heard -> {
            val data = (Weather.state.value as? WeatherState.Ready)?.data
            if (data != null) "${data.temp}${data.tempUnit} and ${Weather.describe(data.code)} in ${data.place}."
            else "I don't have the weather yet."
        }
        else -> null
    }
    private suspend fun callCommand(context: Context, heard: String): String? {
        val name = when {
            heard.startsWith("call ") -> heard.removePrefix("call ")
            heard.startsWith("phone ") -> heard.removePrefix("phone ")
            heard.startsWith("dial ") -> heard.removePrefix("dial ")
            else -> return null
        }.trim()
        if (name.isBlank()) return "Who should I call?"
        if (!hasCallPermissions(context)) return "Gearslip needs the phone and contacts permissions first, from the phone screen."
        val match = withContext(Dispatchers.IO) {
            loadContacts(context).firstOrNull { it.name.lowercase().contains(name) }
        } ?: return "I couldn't find $name in your contacts."
        placeCall(context, match.number)
        return "Calling ${match.name}."
    }
    private suspend fun openAppCommand(
        context: Context,
        navigator: CarNavigator,
        frame: CarEnvironment.Frame,
        heard: String,
    ): String? {
        val name = when {
            heard.startsWith("open ") -> heard.removePrefix("open ")
            heard.startsWith("launch ") -> heard.removePrefix("launch ")
            heard.startsWith("start ") -> heard.removePrefix("start ")
            else -> return null
        }.trim()
        if (name.isBlank()) return null
        val entries = LauncherCache.entries ?: withContext(Dispatchers.IO) { LauncherCache.load(context) }
        val match = entries.firstOrNull { it.label.lowercase().contains(name) }
            ?: return "I couldn't find an app called $name."
        launchEntry(match, navigator, frame)
        return "Opening ${match.label}."
    }
    private val NAVIGATE_TRIGGERS = listOf("navigate to ", "directions to ", "take me to ", "drive to ")
 }
@@ -0,0 +1,107 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.content.Intent
 import android.net.Uri
 import android.provider.Settings
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.vectorResource
 import app.seb3thehacker.gearslip.R
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 /**
 * The band that appears while [CarAssistant] is listening, thinking or speaking - a thin strip
 * across the top, same idea as [CallOverlay]'s active-call banner, so it never blocks the screen
 * the driver was already looking at.
 */
@Composable
 fun AssistantOverlay(modifier: Modifier = Modifier) {
    val state by CarAssistant.state.collectAsState()
    if (state.phase == CarAssistant.Phase.IDLE) return
    val context = LocalContext.current
    Surface(
        color = MaterialTheme.colorScheme.primaryContainer,
        contentColor = MaterialTheme.colorScheme.onPrimaryContainer,
        modifier = modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.padding(horizontal = 16.dp, vertical = 10.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            PulsingMic(state.phase == CarAssistant.Phase.LISTENING)
            Column(Modifier.weight(1f)) {
                Text(
                    when (state.phase) {
                        CarAssistant.Phase.LISTENING -> "Listening…"
                        CarAssistant.Phase.THINKING -> "…"
                        CarAssistant.Phase.SPEAKING -> state.reply
                        CarAssistant.Phase.ERROR -> state.reply
                        CarAssistant.Phase.IDLE -> ""
                    },
                    style = MaterialTheme.typography.titleSmall,
                    fontWeight = FontWeight.SemiBold,
                    maxLines = 2,
                )
                if (state.heard.isNotBlank() && state.phase != CarAssistant.Phase.SPEAKING) {
                    Text(
                        "\"${state.heard}\"",
                        style = MaterialTheme.typography.bodySmall,
                    )
                }
            }
            if (state.missingPermission) {
                GsButton(tone = GsTone.Tonal, onClick = {
                    context.startActivity(
                        Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", context.packageName, null)),
                    )
                }) { Text("Grant") }
            }
            GsIconButton(Icons.Filled.Close, "Dismiss", CarAssistant::cancel)
        }
    }
 }
 /** A filled circle with a mic glyph, pulsing gently while actually listening. */
@Composable
 private fun PulsingMic(listening: Boolean, modifier: Modifier = Modifier) {
    Surface(
        shape = CircleShape,
        color = MaterialTheme.colorScheme.primary,
        contentColor = MaterialTheme.colorScheme.onPrimary,
        modifier = modifier.size(36.dp),
    ) {
        Row(horizontalArrangement = Arrangement.Center) {
            MicGlyph(Modifier.padding(8.dp).size(20.dp))
        }
    }
    // `listening` only changes what's drawn elsewhere in the row (the "Listening…" label);
    // the glyph itself doesn't need to animate for this to read clearly on a glance.
 }
 /** The assistant's mic, from `R.drawable.mic_24`, tinted with the current content colour. */
@Composable
 fun MicGlyph(modifier: Modifier = Modifier) {
    Icon(ImageVector.vectorResource(R.drawable.mic_24), contentDescription = "Assistant", modifier = modifier)
 }
@@ -0,0 +1,134 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.shape.CircleShape
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.call.CallUiState
 import app.seb3thehacker.gearslip.call.CarCalls
 /**
 * Sits above whatever the car is showing while a call is ringing or under way. Ringing takes the
 * whole screen, because nothing else matters more right now; an active call is a thin band along
 * the top, since from here the driver can only see who it is, not end it - see [CarCalls].
 */
@Composable
 fun CallOverlay(modifier: Modifier = Modifier) {
    val state by CarCalls.state.collectAsState()
    val context = LocalContext.current.applicationContext
    when (val s = state) {
        // Covers the box regardless of where the caller aligned it, so the alignment below is
        // only ever felt by the active-call banner, which is the one that isn't full-screen.
        is CallUiState.Ringing -> IncomingCall(s, onAnswer = { CarCalls.answer(context) }, onDecline = CarCalls::decline)
        is CallUiState.Active -> ActiveCallBanner(s, modifier)
        CallUiState.None -> {}
    }
 }
@Composable
 private fun IncomingCall(s: CallUiState.Ringing, onAnswer: () -> Unit, onDecline: () -> Unit) {
    Surface(Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.surfaceContainerLowest) {
        Column(
            Modifier.fillMaxSize().padding(32.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
            verticalArrangement = Arrangement.Center,
        ) {
            Icon(
                Icons.Filled.Call,
                contentDescription = null,
                modifier = Modifier.size(64.dp),
                tint = MaterialTheme.colorScheme.primary,
            )
            Spacer(Modifier.height(16.dp))
            Text(
                "Incoming call",
                style = MaterialTheme.typography.titleMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
            Spacer(Modifier.height(8.dp))
            Text(
                s.caller.label,
                style = MaterialTheme.typography.displaySmall,
                fontWeight = FontWeight.Bold,
                textAlign = TextAlign.Center,
            )
            Spacer(Modifier.height(56.dp))
            Row(horizontalArrangement = Arrangement.spacedBy(48.dp)) {
                CallButton(Icons.Filled.Close, "Decline", MaterialTheme.colorScheme.error, enabled = s.canDecline, onClick = onDecline)
                CallButton(Icons.Filled.Call, "Answer", MaterialTheme.colorScheme.primary, enabled = true, onClick = onAnswer)
            }
            if (!s.canDecline) {
                Spacer(Modifier.height(20.dp))
                Text(
                    "Already ringing out loud - answer here, or let it ring.",
                    style = MaterialTheme.typography.bodySmall,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
            }
        }
    }
 }
@Composable
 private fun CallButton(icon: ImageVector, label: String, color: Color, enabled: Boolean, onClick: () -> Unit) {
    Column(horizontalAlignment = Alignment.CenterHorizontally) {
        GsIconButton(
            icon, label, onClick,
            colors = GsColors(color, Color.White),
            enabled = enabled,
            size = 72.dp,
            iconSize = 30.dp,
            shape = CircleShape,
        )
        Spacer(Modifier.height(8.dp))
        Text(label, style = MaterialTheme.typography.labelLarge)
    }
 }
@Composable
 private fun ActiveCallBanner(s: CallUiState.Active, modifier: Modifier = Modifier) {
    Surface(
        color = MaterialTheme.colorScheme.primaryContainer,
        contentColor = MaterialTheme.colorScheme.onPrimaryContainer,
        modifier = modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.padding(horizontal = 20.dp, vertical = 10.dp),
            horizontalArrangement = Arrangement.Center,
        ) {
            Icon(Icons.Filled.Call, contentDescription = null, modifier = Modifier.size(20.dp))
            Spacer(Modifier.height(0.dp))
            Text(
                "  On a call" + (s.caller?.let { " with ${it.label}" } ?: ""),
                style = MaterialTheme.typography.labelLarge,
                fontWeight = FontWeight.SemiBold,
            )
        }
    }
 }
@@ -0,0 +1,222 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.view.SurfaceHolder
 import android.view.SurfaceView
 import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.gestures.detectTransformGestures
 import androidx.compose.foundation.gestures.awaitEachGesture
 import androidx.compose.foundation.gestures.awaitFirstDown
 import androidx.compose.ui.input.pointer.PointerEventPass
 import androidx.compose.ui.input.pointer.util.VelocityTracker
 import kotlin.math.hypot
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.car.app.model.Template
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.host.CarAppConnection
 /**
 * Shows a connected templated app: its own drawing surface, with host chrome over the top.
 *
 * The surface is a plain SurfaceView. Because the whole car UI is a Presentation on a
 * VirtualDisplay wired to the encoder, a SurfaceView here is composited by SurfaceFlinger into
 * that display like any other layer - so the app's map reaches the head unit down the existing
 * H.264 pipe without Gearslip ever touching a pixel of it.
 */
@Composable
 fun CarAppStage(
    connection: CarAppConnection,
    status: CarAppConnection.Status,
    frame: CarEnvironment.Frame,
    /** Inside the home screen's map pane: no title bar, the template gets the whole area. */
    embedded: Boolean = false,
    onDisconnect: () -> Unit,
 ) {
    val template by connection.template.collectAsStateWithLifecycle()
    Box(Modifier.fillMaxSize()) {
        // The app's own drawing goes underneath; everything else is the host's rendering of
        // the template it described, laid over the top.
        if (status.surfaceRequested) {
            AppSurface(connection, frame, template, Modifier.fillMaxSize())
        }
        TemplateChrome(template, Modifier.fillMaxSize().padding(top = if (embedded) 0.dp else CHROME_BAR))
        if (!embedded) ChromeBar(status, onDisconnect, Modifier.align(Alignment.TopCenter))
    }
 }
 /**
 * A SurfaceView lent to the app for as long as it is on screen.
 *
 * The app writes into this from its own process, so the surface must outlive the handoff;
 * [SurfaceHolder.Callback] is what tells us when that stops being true.
 */
@Composable
 private fun AppSurface(
    connection: CarAppConnection,
    frame: CarEnvironment.Frame,
    template: Template?,
    modifier: Modifier = Modifier,
 ) {
    var size by remember { mutableStateOf(0 to 0) }
    // The app lays its map out around whatever the host covers, so a template change moves the
    // visible area even though the surface itself hasn't changed.
    LaunchedEffect(template, size) {
        val (width, height) = size
        if (width > 0 && height > 0) {
            val visible = visibleAreaFor(template, width, height)
            connection.reportAreas(visible = visible, stable = visible)
        }
    }
    // A fresh SurfaceView - and so a fresh Surface - for every size, the way Android Auto hands an
    // app a new surface rather than resizing the old one. A resized SurfaceView keeps the same
    // BufferQueue, and apps that draw through their own VirtualDisplay build the
    // new one on it before releasing the old: the old display's disconnect then takes the new one's
    // connection with it and the map freezes for good. The nav bar hiding for the search keyboard
    // and the lyrics pane opening both resize this area.
    androidx.compose.foundation.layout.BoxWithConstraints(modifier) {
        val epoch by connection.surfaceEpoch.collectAsState()
        androidx.compose.runtime.key(constraints.maxWidth, constraints.maxHeight, epoch) {
            SurfaceHost(connection, frame, onSize = { size = it }, Modifier.fillMaxSize())
        }
    }
    DisposableEffect(connection) { onDispose { connection.detachSurface() } }
 }
@Composable
 private fun SurfaceHost(
    connection: CarAppConnection,
    frame: CarEnvironment.Frame,
    onSize: (Pair<Int, Int>) -> Unit,
    modifier: Modifier,
 ) {
    AndroidView(
        modifier = modifier
            .pointerInput(connection) {
                detectTapGestures { connection.surfaceClick(it.x, it.y) }
            }
            .pointerInput(connection) {
                detectTransformGestures { centroid, pan, zoom, _ ->
                    // GestureDetector reports scroll as previous-minus-current; a Compose pan
                    // is the other way round.
                    if (pan != Offset.Zero) connection.surfaceScroll(-pan.x, -pan.y)
                    if (zoom != 1f) connection.surfaceScale(centroid.x, centroid.y, zoom)
                }
            }
            .pointerInput(connection) {
                // detectTransformGestures has no velocity, so a fling is measured here alongside
                // it: one finger lifting while still moving lets the map glide on, as on a car.
                // Velocity is the finger's own, which is GestureDetector's onFling convention.
                awaitEachGesture {
                    val down = awaitFirstDown(requireUnconsumed = false)
                    val tracker = VelocityTracker()
                    tracker.addPosition(down.uptimeMillis, down.position)
                    var pinched = false
                    while (true) {
                        val event = awaitPointerEvent(PointerEventPass.Final)
                        if (event.changes.size > 1) pinched = true
                        val change = event.changes.firstOrNull { it.id == down.id } ?: break
                        tracker.addPosition(change.uptimeMillis, change.position)
                        if (!change.pressed) {
                            val v = tracker.calculateVelocity()
                            if (!pinched && hypot(v.x, v.y) >= FLING_MIN_PX_S) {
                                connection.surfaceFling(v.x, v.y)
                            }
                            break
                        }
                    }
                }
            },
        factory = { context ->
            SurfaceView(context).apply {
                holder.addCallback(object : SurfaceHolder.Callback {
                    override fun surfaceCreated(holder: SurfaceHolder) = Unit
                    override fun surfaceChanged(
                        holder: SurfaceHolder,
                        format: Int,
                        width: Int,
                        height: Int,
                    ) {
                        GearslipLog.i("stage: surface ready at ${width}x$height")
                        onSize(width to height)
                        connection.attachSurface(holder.surface, width, height, frame.densityDpi)
                    }
                    override fun surfaceDestroyed(holder: SurfaceHolder) {
                        GearslipLog.i("stage: surface destroyed")
                        // Only this view's own surface: a replaced view's teardown can land after
                        // its successor has already lent the app a new one.
                        connection.detachSurface(holder.surface)
                    }
                })
            }
        },
    )
 }
@Composable
 private fun ChromeBar(
    status: CarAppConnection.Status,
    onDisconnect: () -> Unit,
    modifier: Modifier = Modifier,
 ) {
    Surface(
        color = Color.Black.copy(alpha = 0.55f),
        contentColor = Color.White,
        modifier = modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.padding(horizontal = 16.dp, vertical = 6.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Column(Modifier.weight(1f)) {
                Text(
                    status.app ?: "Car app",
                    style = MaterialTheme.typography.titleSmall,
                    fontWeight = FontWeight.SemiBold,
                )
                val detail = buildList {
                    status.template?.let { add(it) }
                    add(if (status.surfaceAttached) "drawing" else "waiting for the app")
                }.joinToString(" - ")
                Text(detail, style = MaterialTheme.typography.bodySmall)
            }
            GsButton(onClick = onDisconnect, tone = GsTone.Tonal) { Text("Stop") }
        }
    }
 }
 /** Height of [ChromeBar]; the template's own chrome starts below it. */
 private val CHROME_BAR = 44.dp
 /** Slower than this when the finger lifts and it was a drag that stopped, not a fling. */
 private const val FLING_MIN_PX_S = 400f
@@ -0,0 +1,40 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.Share
 import androidx.compose.material.icons.filled.Settings
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import app.seb3thehacker.gearslip.ProjectedContent
 /** One tile in the launcher and the screen it opens. */
 class CarApp(
    val id: String,
    val label: String,
    val icon: ImageVector,
    val content: @Composable () -> Unit,
 )
 /** Built-in apps. Third-party (Android Auto) apps are a later step and will register here too. */
 object CarApps {
    val all: List<CarApp> = listOf(
        CarApp("web", "Web", Icons.Filled.Search) {
            WebApp(content = ProjectedContent.resolve(LocalContext.current))
        },
        CarApp("phone", "Screen sharing", Icons.Filled.Share) {
            PhoneAppsScreen()
        },
        CarApp("dialer", "Phone", Icons.Filled.Call) {
            PhoneDialerScreen()
        },
        CarApp("settings", "Settings", Icons.Filled.Settings) {
            CarSettingsScreen()
        },
    )
    fun find(id: String): CarApp? = all.firstOrNull { it.id == id }
 }
@@ -0,0 +1,265 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.speech.RecognitionListener
 import android.speech.RecognizerIntent
 import android.speech.SpeechRecognizer
 import android.speech.tts.TextToSpeech
 import android.speech.tts.UtteranceProgressListener
 import androidx.core.content.ContextCompat
 import app.seb3thehacker.gearslip.call.CallUiState
 import app.seb3thehacker.gearslip.call.CarCalls
 import app.seb3thehacker.gearslip.speech.SpeechEngine
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 /**
 * A voice assistant: Gearslip's own [SpeechEngine] (whisper.cpp) to listen, the system's
 * [TextToSpeech] to answer. Listening used to go through the system's [SpeechRecognizer] alone,
 * but many phones have no recognizer at all (GrapheneOS ships only text-to-speech), so the
 * system one is now just the fallback for when the bundled engine can't run.
 *
 * Listening and speaking live here; deciding what a command *means* is [AssistantCommands], kept
 * separate because it needs a [CarNavigator] and a frame to act on, neither of which this object
 * has - see [pendingCommand].
 */
 object CarAssistant {
    enum class Phase { IDLE, LISTENING, THINKING, SPEAKING, ERROR }
    data class State(
        val phase: Phase = Phase.IDLE,
        val heard: String = "",
        val reply: String = "",
        val missingPermission: Boolean = false,
    )
    private val _state = MutableStateFlow(State())
    val state: StateFlow<State> = _state
    /** Set once a recognition result comes in; [reply] clears it once handled. */
    private val _pendingCommand = MutableStateFlow<String?>(null)
    val pendingCommand: StateFlow<String?> = _pendingCommand
    private var appContext: Context? = null
    private var recognizer: SpeechRecognizer? = null
    private var tts: TextToSpeech? = null
    private var ttsReady = false
    fun init(context: Context) {
        appContext = context.applicationContext
        if (tts != null) return
        tts = TextToSpeech(appContext) { status -> ttsReady = status == TextToSpeech.SUCCESS }
    }
    private val mainHandler = Handler(Looper.getMainLooper())
    /**
     * Starts listening, or does nothing if the assistant is already busy with the last request.
     * [SpeechRecognizer] must be driven from a thread with a Looper, but this is also called from
     * the raw wire-protocol worker thread ([GearslipRunner]'s key-event handling for the head
     * unit's own PTT button) which has none - so this always hops to the main thread itself
     * rather than asking every caller to remember to.
     */
    fun start() {
        if (Looper.myLooper() == Looper.getMainLooper()) startOnMainThread() else mainHandler.post(::startOnMainThread)
    }
    private fun startOnMainThread() {
        val context = appContext ?: return
        if (_state.value.phase == Phase.LISTENING || _state.value.phase == Phase.THINKING) return
        if (ContextCompat.checkSelfPermission(context, android.Manifest.permission.RECORD_AUDIO) !=
            PackageManager.PERMISSION_GRANTED
        ) {
            _state.value = State(Phase.ERROR, reply = "Needs the microphone permission.", missingPermission = true)
            return
        }
        // Android hands every app but the dialer a silent microphone during a call.
        if (CarCalls.state.value is CallUiState.Active) {
            _state.value = State(Phase.ERROR, reply = "Voice commands work once the call ends.")
            return
        }
        tts?.stop()
        _state.value = State(Phase.LISTENING)
        listenOnce(
            onPartial = { text -> _state.value = _state.value.copy(heard = text) },
            onHeard = { _state.value = _state.value.copy(phase = Phase.THINKING) },
            onResult = { text ->
                _state.value = _state.value.copy(phase = Phase.THINKING, heard = text)
                _pendingCommand.value = text
            },
            onError = { message -> _state.value = State(Phase.ERROR, reply = message) },
        )
    }
    /** Closes the overlay from wherever it's showing: mid-listen, mid-think, or after speaking. */
    fun cancel() {
        releaseRecognizer()
        tts?.stop()
        _pendingCommand.value = null
        _state.value = State(Phase.IDLE)
    }
    /**
     * Called once [pendingCommand] has been turned into an answer - from [CarUi], the one place
     * that actually has a [CarNavigator] to have acted on it with.
     */
    fun reply(text: String) {
        _pendingCommand.value = null
        _state.value = _state.value.copy(phase = Phase.SPEAKING, reply = text)
        val engine = tts
        if (engine == null || !ttsReady || text.isBlank()) {
            _state.value = _state.value.copy(phase = Phase.IDLE)
            return
        }
        engine.setOnUtteranceProgressListener(object : UtteranceProgressListener() {
            override fun onStart(utteranceId: String?) {}
            override fun onDone(utteranceId: String?) {
                _state.value = _state.value.copy(phase = Phase.IDLE)
            }
            @Deprecated("Deprecated in Java, no replacement on this API level")
            override fun onError(utteranceId: String?) {
                _state.value = _state.value.copy(phase = Phase.IDLE)
            }
        })
        engine.speak(text, TextToSpeech.QUEUE_FLUSH, null, "gearslip-assistant")
    }
    /**
     * Speaks [text] for someone other than the assistant (a message read aloud), then runs
     * [onDone] on the main thread - straight away if speech isn't available.
     */
    fun say(text: String, onDone: () -> Unit) {
        val engine = tts
        if (engine == null || !ttsReady || text.isBlank()) {
            mainHandler.post(onDone)
            return
        }
        engine.setOnUtteranceProgressListener(object : UtteranceProgressListener() {
            override fun onStart(utteranceId: String?) {}
            override fun onDone(utteranceId: String?) { mainHandler.post(onDone) }
            @Deprecated("Deprecated in Java, no replacement on this API level")
            override fun onError(utteranceId: String?) { mainHandler.post(onDone) }
            // Stopped part way: whoever stopped it has already moved on.
            override fun onStop(utteranceId: String?, interrupted: Boolean) {}
        })
        engine.speak(text, TextToSpeech.QUEUE_FLUSH, null, "gearslip-say")
    }
    fun stopSpeaking() { tts?.stop() }
    /**
     * Listens once, the same way the assistant does, and hands back what was said without acting
     * on it. Callbacks arrive on the main thread; [onError] gets a sentence fit to show.
     */
    fun dictate(
        onPartial: (String) -> Unit,
        onResult: (String) -> Unit,
        onError: (String) -> Unit,
        cue: Boolean = true,
        onSpeaking: () -> Unit = {},
    ) {
        cancel()
        listenOnce(onPartial, onHeard = {}, onResult, onError, cue, onSpeaking)
    }
    /**
     * One phrase, through Gearslip's own [SpeechEngine]. The phone's recognizer is only a fallback
     * for when the engine itself can't run, since plenty of phones (GrapheneOS among them) have none.
     */
    private fun listenOnce(
        onPartial: (String) -> Unit,
        onHeard: () -> Unit,
        onResult: (String) -> Unit,
        onError: (String) -> Unit,
        cue: Boolean = true,
        onSpeaking: () -> Unit = {},
    ) {
        val context = appContext ?: return onError("Speech isn't ready yet.")
        SpeechEngine.listen(
            context,
            cue = cue,
            onSpeaking = onSpeaking,
            onHeard = onHeard,
            onResult = onResult,
            onError = { message ->
                if (message == SpeechEngine.NOT_LOADED && SpeechRecognizer.isRecognitionAvailable(context)) {
                    systemListen(context, onPartial, onHeard, onResult, onError)
                } else {
                    onError(message)
                }
            },
        )
    }
    private fun systemListen(
        context: Context,
        onPartial: (String) -> Unit,
        onHeard: () -> Unit,
        onResult: (String) -> Unit,
        onError: (String) -> Unit,
    ) {
        val r = SpeechRecognizer.createSpeechRecognizer(context)
        recognizer = r
        r.setRecognitionListener(object : RecognitionListener {
            override fun onReadyForSpeech(params: Bundle?) {}
            override fun onBeginningOfSpeech() {}
            override fun onRmsChanged(rmsdB: Float) {}
            override fun onBufferReceived(buffer: ByteArray?) {}
            override fun onEndOfSpeech() = onHeard()
            override fun onEvent(eventType: Int, params: Bundle?) {}
            override fun onError(error: Int) {
                releaseRecognizer()
                onError(errorMessage(error))
            }
            override fun onResults(results: Bundle?) {
                releaseRecognizer()
                val text = results?.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION)?.firstOrNull().orEmpty()
                if (text.isBlank()) onError("Didn't catch that.") else onResult(text)
            }
            override fun onPartialResults(partialResults: Bundle?) {
                partialResults?.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION)?.firstOrNull()?.let(onPartial)
            }
        })
        r.startListening(
            Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH).apply {
                putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
                putExtra(RecognizerIntent.EXTRA_PARTIAL_RESULTS, true)
                putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, context.packageName)
            },
        )
    }
    fun stopListening() = releaseRecognizer()
    private fun releaseRecognizer() {
        SpeechEngine.cancel()
        recognizer?.let { runCatching { it.cancel() }; it.destroy() }
        recognizer = null
    }
    private fun errorMessage(code: Int): String = when (code) {
        SpeechRecognizer.ERROR_NO_MATCH, SpeechRecognizer.ERROR_SPEECH_TIMEOUT -> "Didn't catch that."
        SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS -> "Needs the microphone permission."
        SpeechRecognizer.ERROR_RECOGNIZER_BUSY -> "The speech recognizer is busy."
        SpeechRecognizer.ERROR_NETWORK, SpeechRecognizer.ERROR_NETWORK_TIMEOUT -> "The speech recognizer needs a network it doesn't have."
        else -> "Speech recognition failed."
    }
    fun shutdown() {
        releaseRecognizer()
        tts?.shutdown()
        tts = null
        ttsReady = false
    }
 }
@@ -0,0 +1,211 @@
 package app.seb3thehacker.gearslip.car
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
 import android.database.Cursor
 import android.location.LocationManager
 import android.provider.CalendarContract
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.produceState
 import app.seb3thehacker.gearslip.car.theme.GsColors
 import app.seb3thehacker.gearslip.car.theme.GsIconBox
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.GearslipLog
 import java.net.HttpURLConnection
 import java.net.URL
 import java.text.DateFormat
 import java.text.SimpleDateFormat
 import java.util.Calendar
 import java.util.Date
 import java.util.Locale
 import java.util.TimeZone
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.json.JSONObject
 /**
 * Opened from the nav bar clock: the current weather, the week's calendar and the phone's
 * notifications, at a glance. The first two
 * need permissions granted on the phone (READ_CALENDAR, location) - if either was declined
 * this just shows an empty state instead of asking again from inside the car UI.
 */
@Composable
 fun CarDashboardScreen() {
    val context = LocalContext.current.applicationContext
    Column(
        Modifier
            .fillMaxSize()
            .verticalScroll(rememberScrollState())
            .padding(horizontal = 24.dp, vertical = 16.dp),
        verticalArrangement = Arrangement.spacedBy(24.dp),
    ) {
        Text("Today", style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold)
        WeatherCard(context)
        AgendaCard(context)
        NotificationsSection()
    }
 }
@Composable
 private fun WeatherCard(context: Context) {
    val state by Weather.state.collectAsState()
    val navigator = LocalCarNavigator.current
    LaunchedEffect(Unit) { Weather.refresh(context) }
    GsIconBox(
        onClick = { navigator.weather() },
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
        shape = MaterialTheme.shapes.extraLarge,
    ) {
        Row(
            Modifier.fillMaxWidth().padding(20.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            when (val s = state) {
                WeatherState.Loading -> Text("Getting weather…", style = MaterialTheme.typography.bodyLarge)
                is WeatherState.Unavailable -> Text(
                    s.reason, style = MaterialTheme.typography.bodyLarge,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
                is WeatherState.Ready -> {
                    val w = s.data
                    WeatherIcon(w.code, w.isDay, size = 44.dp)
                    Column {
                        Text(
                            "${w.temp}${w.tempUnit}  ·  ${Weather.describe(w.code)}",
                            style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.SemiBold,
                        )
                        Text(w.place, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
                    }
                }
            }
        }
    }
 }
@Composable
 private fun AgendaCard(context: Context) {
    val events by produceState<List<AgendaEvent>?>(cachedAgenda) {
        value = withContext(Dispatchers.IO) { fetchAgenda(context) }.also { cachedAgenda = it }
    }
    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
        Text("Coming up", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
        val list = events
        when {
            list == null -> Text("Loading calendar…", style = MaterialTheme.typography.bodyMedium)
            list.isEmpty() -> Text(
                "Nothing in the next week.",
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
            else -> list.forEach { EventRow(it) }
        }
    }
 }
@Composable
 private fun EventRow(event: AgendaEvent) {
    Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
        Row(
            Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 12.dp),
            horizontalArrangement = Arrangement.spacedBy(12.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Text(
                eventWhen(event),
                style = MaterialTheme.typography.bodyLarge,
                fontWeight = FontWeight.SemiBold,
            )
            Text(
                event.title,
                style = MaterialTheme.typography.bodyLarge,
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
        }
    }
 }
 /** "Today" events show just a time; later days get a weekday so a week's list stays readable. */
 private fun eventWhen(event: AgendaEvent): String {
    val zone = if (event.allDay) TimeZone.getTimeZone("UTC") else TimeZone.getDefault()
    val start = Calendar.getInstance(zone).apply { timeInMillis = event.startMillis }
    val today = Calendar.getInstance()
    val sameDay = start.get(Calendar.YEAR) == today.get(Calendar.YEAR) &&
        start.get(Calendar.DAY_OF_YEAR) == today.get(Calendar.DAY_OF_YEAR)
    val time = if (event.allDay) "All day" else DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(event.startMillis))
    if (sameDay || (event.allDay && start.before(today))) return time
    return SimpleDateFormat("EEE", Locale.getDefault()).apply { timeZone = zone }.format(Date(event.startMillis)) + " " + time
 }
 private data class AgendaEvent(val title: String, val startMillis: Long, val allDay: Boolean)
@Volatile private var cachedAgenda: List<AgendaEvent>? = null
 /** Loads the weather and the agenda ahead of time, so the dashboard opens with both in place. */
 fun warmDashboard(context: Context) {
    Weather.refresh(context, force = true)
    cachedAgenda = fetchAgenda(context)
 }
 /**
 * Empty list means no permission or nothing scheduled. Looks from the start of today so an
 * event already under way still shows, a week ahead so tomorrow's does too, and skips ones
 * that have finished.
 */
 private fun fetchAgenda(context: Context): List<AgendaEvent> {
    if (context.checkSelfPermission(Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
        return emptyList()
    }
    val now = System.currentTimeMillis()
    val startOfToday = Calendar.getInstance().apply {
        set(Calendar.HOUR_OF_DAY, 0); set(Calendar.MINUTE, 0); set(Calendar.SECOND, 0); set(Calendar.MILLISECOND, 0)
    }.timeInMillis
    val end = startOfToday + 7 * 24 * 60 * 60 * 1000L
    val uri = CalendarContract.Instances.CONTENT_URI.buildUpon()
        .appendPath(startOfToday.toString())
        .appendPath(end.toString())
        .build()
    val events = mutableListOf<AgendaEvent>()
    val projection = arrayOf(
        CalendarContract.Instances.TITLE, CalendarContract.Instances.BEGIN,
        CalendarContract.Instances.END, CalendarContract.Instances.ALL_DAY,
    )
    runCatching {
        context.contentResolver.query(uri, projection, null, null, "${CalendarContract.Instances.BEGIN} ASC")
            ?.use { cursor: Cursor ->
                while (cursor.moveToNext() && events.size < 10) {
                    val allDay = cursor.getInt(3) == 1
                    // All-day events are stored in UTC midnight, so "ended" means the day is over, not the instant.
                    if (!allDay && cursor.getLong(2) < now) continue
                    events.add(AgendaEvent(cursor.getString(0) ?: "(untitled)", cursor.getLong(1), allDay))
                }
            }
    }.onFailure { GearslipLog.w("calendar query failed: ${it.message}") }
    return events
 }
@@ -0,0 +1,140 @@
 package app.seb3thehacker.gearslip.car
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.res.Configuration
 import android.os.BatteryManager
 import android.os.Handler
 import android.os.Looper
 import java.util.Calendar
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 /**
 * What the car UI and the apps inside it can know about the world outside the UI.
 *
 * [phoneDark] is the phone's own theme and picks the car UI's colours. [darkOutside] is a
 * separate signal, "is it dark out", for apps that want to adapt (a map, a web page).
 *
 * Where [darkOutside] comes from is deliberately swappable. Today it is a time-of-day guess.
 * The right source is the head unit's own night-mode sensor, which arrives on the AA sensor
 * channel once that exists; feed it in through [setSensorNight] and it takes over.
 */
 object CarEnvironment {
    data class Battery(val percent: Int, val charging: Boolean)
    private val phoneDarkFlow = MutableStateFlow(false)
    private val darkOutsideFlow = MutableStateFlow(false)
    private val batteryFlow = MutableStateFlow(Battery(-1, false))
    private val displayFlow = MutableStateFlow("")
    /** The projected frame's real geometry, for anything that has to lay out against it. */
    data class Frame(val width: Int, val height: Int, val densityDpi: Int)
    private val frameFlow = MutableStateFlow(Frame(800, 480, 160))
    val frame: StateFlow<Frame> = frameFlow
    val phoneDark: StateFlow<Boolean> = phoneDarkFlow
    val darkOutside: StateFlow<Boolean> = darkOutsideFlow
    val battery: StateFlow<Battery> = batteryFlow
    /** Human-readable projected resolution, for the connection info in car Settings. */
    val display: StateFlow<String> = displayFlow
    private val vehicleFlow = MutableStateFlow("")
    private val insetsFlow = MutableStateFlow(app.seb3thehacker.gearslip.Insets.NONE)
    /** Name of the matched vehicle profile, for the connection info in car Settings. */
    val vehicle: StateFlow<String> = vehicleFlow
    /** How much of the video frame the car UI keeps clear, from the matched vehicle profile. */
    val insets: StateFlow<app.seb3thehacker.gearslip.Insets> = insetsFlow
    /** Live adjustment from car Settings; not persisted until saved to the vehicle profile. */
    fun setInsets(insets: app.seb3thehacker.gearslip.Insets) {
        insetsFlow.value = insets
    }
    fun setVehicle(name: String, insets: app.seb3thehacker.gearslip.Insets) {
        vehicleFlow.value = name
        insetsFlow.value = insets
    }
    @Volatile private var sensorNight: Boolean? = null
    private var appContext: Context? = null
    private var running = false
    private val handler = Handler(Looper.getMainLooper())
    private val tick = object : Runnable {
        override fun run() {
            refresh()
            handler.postDelayed(this, 60_000)
        }
    }
    private val batteryReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            intent?.let(::readBattery)
        }
    }
    fun setPhoneTheme(configuration: Configuration) {
        phoneDarkFlow.value =
            (configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES
    }
    /** For the AA sensor channel: null goes back to the time-of-day guess. */
    fun setSensorNight(night: Boolean?) {
        sensorNight = night
        refresh()
    }
    fun setDisplay(width: Int, height: Int, densityDpi: Int) {
        displayFlow.value = "${width}x$height @ ${densityDpi}dpi"
        frameFlow.value = Frame(width, height, densityDpi)
    }
    fun start(context: Context) {
        if (running) return
        running = true
        appContext = context.applicationContext
        setPhoneTheme(context.resources.configuration)
        val sticky = context.applicationContext.registerReceiver(
            batteryReceiver, IntentFilter(Intent.ACTION_BATTERY_CHANGED), Context.RECEIVER_NOT_EXPORTED,
        )
        sticky?.let(::readBattery)
        handler.post(tick)
    }
    fun stop() {
        if (!running) return
        running = false
        handler.removeCallbacks(tick)
        runCatching { appContext?.unregisterReceiver(batteryReceiver) }
    }
    fun refresh() {
        darkOutsideFlow.value = when (CarSettings.nightMode.value) {
            NightMode.DAY -> false
            NightMode.NIGHT -> true
            NightMode.AUTO -> sensorNight ?: guessNightFromClock()
        }
    }
    private fun guessNightFromClock(): Boolean {
        val hour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY)
        return hour >= 20 || hour < 6
    }
    private fun readBattery(intent: Intent) {
        val level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
        val scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100)
        val status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1)
        val charging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
            status == BatteryManager.BATTERY_STATUS_FULL
        batteryFlow.value = Battery(if (level >= 0 && scale > 0) level * 100 / scale else -1, charging)
    }
 }
@@ -0,0 +1,258 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material.icons.filled.Favorite
 import androidx.compose.material.icons.filled.FavoriteBorder
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.vectorResource
 import android.support.v4.media.session.PlaybackStateCompat
 import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import android.media.session.PlaybackState
 import app.seb3thehacker.gearslip.media.MediaArt
 import kotlinx.coroutines.delay
 import androidx.compose.material3.Icon
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.tween
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.luminance
 import app.seb3thehacker.gearslip.media.ArtColor
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import app.seb3thehacker.gearslip.host.CarAppConnection
 import app.seb3thehacker.gearslip.media.CarMedia
 import app.seb3thehacker.gearslip.media.NowPlaying
 import kotlinx.coroutines.launch
 /**
 * The home screen: the map on the left, the docked player on the right when asked for.
 *
 * The map is whatever navigation app was used last, brought back on its own. The player sits in
 * the nav bar's pill until its dock button moves it here; the column closes itself back to a
 * full-width map once nothing is playing.
 */
@Composable
 fun CarHome() {
    val frame by CarEnvironment.frame.collectAsStateWithLifecycle()
    val navStatus by CarServices.nav.status.collectAsStateWithLifecycle()
    val phase by CarServices.media.phase.collectAsStateWithLifecycle()
    val now by CarServices.media.now.collectAsStateWithLifecycle()
    LaunchedEffect(Unit) { CarServices.autostart(frame) }
    LaunchedEffect(phase) { if (phase == CarMedia.Phase.READY) CarServices.autoplayIfDue() }
    val navigator = LocalCarNavigator.current
    val panel = navigator.sidePanel
    // Coming back to the map from another screen: the map stayed loaded underneath, so its surface
    // is only replaced if it died meanwhile. The first composition is skipped, since the surface
    // is only just being lent.
    val onHome = navigator.current == CarScreen.Home
    val seenHome = remember { booleanArrayOf(false) }
    LaunchedEffect(onHome) {
        if (onHome && seenHome[0]) CarServices.nav.replaceDeadSurface()
        if (onHome) seenHome[0] = true
    }
    val splitScreen = phase == CarMedia.Phase.READY && now.isActive && panel != SidePanel.NONE
    // No outer padding on any side, split screen or not - only the gap between the two panes
    // when the player is sharing the screen with the map.
    Row(
        Modifier.fillMaxSize(),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        Box(
            Modifier
                .weight(if (splitScreen) 2.1f else 1f)
                .fillMaxHeight(),
        ) {
            MapPane(navStatus, frame)
        }
        if (splitScreen) {
            val side = Modifier.weight(1f).fillMaxHeight()
            if (panel == SidePanel.LYRICS) SideLyrics(now, side) else DockedPlayer(now, side)
        }
    }
 }
@Composable
 private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame) {
    val navigator = LocalCarNavigator.current
    if (status.phase == CarAppConnection.Phase.RUNNING) {
        CarAppStage(CarServices.nav, status, frame, embedded = true) { CarServices.stopNav() }
        return
    }
    Column(
        Modifier.fillMaxSize().padding(24.dp),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        val hasLast = CarSettings.lastNav.value != null
        val hasNavApps by CarServices.hasNavApps.collectAsStateWithLifecycle()
        val scope = androidx.compose.runtime.rememberCoroutineScope()
        when (status.phase) {
            CarAppConnection.Phase.BINDING, CarAppConnection.Phase.HANDSHAKE ->
                Text("Starting ${status.app ?: "the map"}…", style = MaterialTheme.typography.titleMedium)
            CarAppConnection.Phase.REJECTED, CarAppConnection.Phase.FAILED -> {
                Text("${status.app ?: "The map app"} would not start.", style = MaterialTheme.typography.titleMedium)
                status.detail?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant) }
                GsButton(onClick = navigator::apps, tone = GsTone.Tonal) { Text("Choose another app") }
            }
            else -> if (!hasNavApps) {
                // Nothing to auto-select and nothing to pick from Car apps either - this is the
                // only case worth a distinct screen, since every other IDLE case resolves itself.
                Text("No mapping apps found.", style = MaterialTheme.typography.titleMedium)
                Text(
                    "Install a navigation app that supports Android Auto and it will start here on its own.",
                    style = MaterialTheme.typography.bodyMedium,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
            } else if (hasLast) {
                // IDLE with a last app on record means the driver stopped it themselves - it will
                // not come back on its own, so the screen must offer a way to bring it back rather
                // than sit on a "starting" message that never resolves.
                Text("Map stopped.", style = MaterialTheme.typography.titleMedium)
                GsButton(onClick = { scope.launch { CarServices.reconnectNav(frame) } }, tone = GsTone.Tonal) { Text("Reopen") }
                GsButton(onClick = { navigator.apps() }, tone = GsTone.Tonal) { Text("Car apps") }
            } else {
                // Autostart is still picking one - a navigation app is installed, so this resolves
                // to a "Starting..." state itself, in the next frame or two.
            }
        }
    }
 }
 /**
 * The player, docked beside the map: art, title, progress, transport, then like, shuffle, repeat
 * and lyrics. While it's here the nav bar's pill steps aside on Home, so the controls never show
 * twice. The X sends it back to the nav bar.
 */
@Composable
 private fun DockedPlayer(now: NowPlaying, modifier: Modifier) {
    val navigator = LocalCarNavigator.current
    val media = CarServices.media
    val context = LocalContext.current
    val scheme = MaterialTheme.colorScheme
    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
    Surface(modifier = modifier, color = rememberArtColor(art, MaterialTheme.colorScheme.surfaceVariant)) {
        BoxWithConstraints(Modifier.fillMaxSize().padding(12.dp)) {
            // Whatever height the controls below leave over, so the art grows on a taller
            // screen and shrinks rather than pushing the buttons off a short one.
            val artSize = minOf(maxWidth - 44.dp, maxHeight - 250.dp).coerceIn(56.dp, 200.dp)
            Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally) {
                Box(Modifier.fillMaxWidth()) {
                    // Art opens the full media screen, same as on the pill.
                    Box(
                        Modifier
                            .align(Alignment.TopCenter)
                            .size(artSize)
                            .clip(RoundedCornerShape(12.dp))
                            .background(scheme.surface)
                            .clickable { navigator.media() },
                    ) {
                        art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
                    }
                    GsIconButton(
                        Icons.Filled.Close, "Back to the nav bar", navigator::closeSidePanel,
                        Modifier.align(Alignment.TopEnd), size = 36.dp, iconSize = 20.dp,
                    )
                }
                Spacer(Modifier.height(10.dp))
                Text(
                    now.title, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold,
                    maxLines = 1, overflow = TextOverflow.Ellipsis,
                )
                Text(
                    now.artist, style = MaterialTheme.typography.bodyMedium, color = scheme.onSurfaceVariant,
                    maxLines = 1, overflow = TextOverflow.Ellipsis,
                )
                if (now.durationMs > 0) {
                    PlayerProgress(now, media, Modifier.fillMaxWidth().padding(vertical = 2.dp), showTimes = false)
                } else {
                    Spacer(Modifier.height(10.dp))
                }
                TransportRow(now, media, skip = 48.dp, modifier = Modifier.fillMaxWidth())
                Spacer(Modifier.height(10.dp))
                PlayModeRow(now, media, size = 42.dp, modifier = Modifier.fillMaxWidth()) {
                    GsIconButton(
                        ImageVector.vectorResource(R.drawable.lyrics_24), "Lyrics", navigator::showSideLyrics,
                        size = 42.dp, iconSize = 22.dp,
                    )
                }
            }
        }
    }
 }
 /**
 * Lyrics alone beside the map, big enough to read at a glance. No art: that space goes to a
 * larger title and artist instead. The player goes back to the nav bar meanwhile, whose dock
 * button swaps these back out for the controls.
 */
@Composable
 private fun SideLyrics(now: NowPlaying, modifier: Modifier) {
    val navigator = LocalCarNavigator.current
    val context = LocalContext.current
    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
    Surface(modifier = modifier, color = rememberArtColor(art, MaterialTheme.colorScheme.surfaceVariant)) {
        Column(Modifier.fillMaxSize().padding(16.dp)) {
            Row(verticalAlignment = Alignment.Top) {
                Column(Modifier.weight(1f)) {
                    Text(
                        now.title, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold,
                        maxLines = 2, overflow = TextOverflow.Ellipsis,
                    )
                    Text(
                        now.artist, style = MaterialTheme.typography.titleMedium,
                        color = MaterialTheme.colorScheme.onSurfaceVariant,
                        maxLines = 1, overflow = TextOverflow.Ellipsis,
                    )
                }
                GsIconButton(Icons.Filled.Close, "Hide lyrics", navigator::closeSidePanel, size = 36.dp, iconSize = 20.dp)
            }
            Spacer(Modifier.height(12.dp))
            LyricsPanel(now, Modifier.weight(1f).fillMaxWidth(), lineStyle = MaterialTheme.typography.headlineSmall)
        }
    }
 }
@@ -0,0 +1,217 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.foundation.shape.RoundedCornerShape
 /**
 * Whether a [CarKeyboard] is on screen right now, so [CarUi] can give it the row of height the
 * bottom nav bar normally holds instead of squeezing it in above - a driver typing has no use
 * for Home/Apps/Settings shortcuts anyway, and the screen is small enough that the space matters.
 */
 object CarKeyboardVisibility {
    val state = mutableStateOf(false)
 }
 /**
 * A keyboard the host draws itself.
 *
 * Text entry in a car can't use the phone's IME: the car UI lives in a Presentation on a
 * virtual display, where a system keyboard has nowhere sensible to appear, and a phone keyboard
 * is the wrong shape for a screen a driver glances at anyway. Android Auto draws its own for
 * the same reasons, so this does too - large keys, no long-press, no prediction.
 *
 * It is a pure function of [text]: every key reports the new string and holds no state beyond
 * which layer is showing. Laid out like a PC's QWERTY keyboard rather than a phone's: shift and
 * backspace flank the letter block (top-right and bottom-left of it, same as a physical board),
 * not the space bar, so a fumbled reach for space never lands on delete instead.
 *
 * [onDismiss] is null wherever there's no keyboard-shown state independent of the screen itself
 * (a search template, sign-in) - there, the header's own back action is the only way out and no
 * dismiss button is drawn.
 */
@Composable
 fun CarKeyboard(
    text: String,
    onTextChange: (String) -> Unit,
    onSubmit: () -> Unit,
    modifier: Modifier = Modifier,
    submitIcon: Boolean = true,
    submitImage: ImageVector? = null,
    onDismiss: (() -> Unit)? = null,
 ) {
    var symbols by remember { mutableStateOf(false) }
    var shifted by remember { mutableStateOf(false) }
    DisposableEffect(Unit) {
        CarKeyboardVisibility.state.value = true
        onDispose { CarKeyboardVisibility.state.value = false }
    }
    val rows = if (symbols) SYMBOL_ROWS else LETTER_ROWS
    Surface(
        color = MaterialTheme.colorScheme.surfaceContainerHigh,
        modifier = modifier.fillMaxWidth(),
    ) {
        Column(
            Modifier.padding(horizontal = 6.dp, vertical = 4.dp),
            verticalArrangement = Arrangement.spacedBy(4.dp),
        ) {
            rows.dropLast(1).forEach { row ->
                Row(
                    Modifier.fillMaxWidth(),
                    horizontalArrangement = Arrangement.spacedBy(4.dp),
                ) {
                    row.forEach { key ->
                        val label = if (shifted && !symbols) key.uppercase() else key
                        Key(label, Modifier.weight(1f)) {
                            onTextChange(text + label)
                            shifted = false
                        }
                    }
                }
            }
            // The bottom letter row: shift and backspace bookend it, exactly where a physical
            // keyboard puts them relative to the letter block, not down beside the space bar.
            Row(
                Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.spacedBy(4.dp),
            ) {
                if (!symbols) {
                    Key(if (shifted) "SHIFT" else "shift", Modifier.weight(1.6f)) { shifted = !shifted }
                }
                rows.last().forEach { key ->
                    val label = if (shifted && !symbols) key.uppercase() else key
                    Key(label, Modifier.weight(1f)) {
                        onTextChange(text + label)
                        shifted = false
                    }
                }
                Key("⌫", Modifier.weight(1.6f)) {
                    if (text.isNotEmpty()) onTextChange(text.dropLast(1))
                }
            }
            // Control row: no backspace here - it stays with the letters above, not next to the
            // key most likely to be hit right after it by mistake. Dismiss (when offered) is the
            // last key, bottom-right corner of the keyboard.
            Row(
                Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.spacedBy(4.dp),
            ) {
                Key(if (symbols) "abc" else "?123", Modifier.weight(1.4f)) { symbols = !symbols }
                Key("space", Modifier.weight(if (onDismiss != null) 3.2f else 4f)) { onTextChange("$text ") }
                SubmitKey(Modifier.weight(1.6f), submitIcon, submitImage, onSubmit)
                if (onDismiss != null) {
                    DismissKey(onDismiss, Modifier.weight(1.4f))
                }
            }
        }
    }
 }
@Composable
 private fun Key(label: String, modifier: Modifier = Modifier, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(KEY_HEIGHT),
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
        shape = RoundedCornerShape(8.dp),
    ) {
        Row(
            Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.Center,
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Text(
                label,
                style = MaterialTheme.typography.titleMedium,
                fontWeight = FontWeight.Medium,
                maxLines = 1,
            )
        }
    }
 }
@Composable
 private fun DismissKey(onClick: () -> Unit, modifier: Modifier = Modifier) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(KEY_HEIGHT),
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurfaceVariant),
        shape = RoundedCornerShape(8.dp),
    ) {
        Row(
            Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.Center,
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Icon(Icons.Filled.Close, contentDescription = "Hide keyboard")
        }
    }
 }
@Composable
 private fun SubmitKey(modifier: Modifier, search: Boolean, image: ImageVector?, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(KEY_HEIGHT),
        colors = GsColors(MaterialTheme.colorScheme.primary, MaterialTheme.colorScheme.onPrimary),
        shape = RoundedCornerShape(8.dp),
    ) {
        Row(
            Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.Center,
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Icon(
                image ?: if (search) Icons.Filled.Search else Icons.Filled.ArrowBack,
                contentDescription = "Submit",
            )
        }
    }
 }
 /**
 * Big enough to hit on a bumpy road, small enough that four rows plus a field plus a few
 * results all fit a 480px-tall screen - which is the real constraint here, not the key size.
 */
 private val KEY_HEIGHT = 34.dp
 private val LETTER_ROWS = listOf(
    "qwertyuiop".map { it.toString() },
    "asdfghjkl".map { it.toString() },
    "zxcvbnm".map { it.toString() },
 )
 private val SYMBOL_ROWS = listOf(
    "1234567890".map { it.toString() },
    listOf("-", "/", ":", ";", "(", ")", "$", "&", "@", "\""),
    listOf(".", ",", "?", "!", "'", "#", "%", "*", "+", "="),
 )
@@ -0,0 +1,137 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import android.os.Handler
 import android.os.Looper
 import android.view.KeyEvent
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.call.CallUiState
 import app.seb3thehacker.gearslip.call.CarCalls
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
 /**
 * The car's own buttons: steering wheel, rotary knob, D-pad and the hard keys around the screen.
 *
 * The head unit sends Android keycodes as they are, so the numbers here are android.view.KeyEvent's.
 * Media, voice and call keys act straight away. Keys that move around the car UI (back, home, the
 * knob) need a [CarNavigator], which only [CarUi] has, so they go out on [screenKeys]. Focus keys
 * (D-pad, knob turns, OK) become real key events on the car's display through [focusSink], where
 * Compose moves focus between buttons the same way it would with a keyboard.
 */
 object CarKeys {
    /** A key that changes which screen is showing. */
    enum class ScreenKey { BACK, HOME, MAP, MEDIA, PHONE }
    private val _screenKeys = MutableSharedFlow<ScreenKey>(extraBufferCapacity = 8)
    val screenKeys: SharedFlow<ScreenKey> = _screenKeys
    /** Delivers an Android key event to the car display; set while the car UI is showing. */
    @Volatile var focusSink: ((keyCode: Int, down: Boolean) -> Unit)? = null
    private var appContext: Context? = null
    private val main = Handler(Looper.getMainLooper())
    fun init(context: Context) { appContext = context.applicationContext }
    /**
     * Every key worth asking the head unit for. The binding request lists what the head unit
     * offered; when it offers nothing (some units leave the list empty and send keys anyway),
     * this is what's asked for instead.
     */
    val WANTED = listOf(
        KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE, KeyEvent.KEYCODE_MEDIA_PLAY, KeyEvent.KEYCODE_MEDIA_PAUSE,
        KeyEvent.KEYCODE_MEDIA_NEXT, KeyEvent.KEYCODE_MEDIA_PREVIOUS, KeyEvent.KEYCODE_MEDIA_STOP,
        KeyEvent.KEYCODE_SEARCH, KeyEvent.KEYCODE_VOICE_ASSIST,
        KeyEvent.KEYCODE_CALL, KeyEvent.KEYCODE_ENDCALL,
        KeyEvent.KEYCODE_BACK, KeyEvent.KEYCODE_HOME,
        KeyEvent.KEYCODE_DPAD_UP, KeyEvent.KEYCODE_DPAD_DOWN, KeyEvent.KEYCODE_DPAD_LEFT,
        KeyEvent.KEYCODE_DPAD_RIGHT, KeyEvent.KEYCODE_DPAD_CENTER, KeyEvent.KEYCODE_ENTER,
        KEYCODE_ROTARY_CONTROLLER, KEYCODE_MEDIA, KEYCODE_NAVIGATION, KEYCODE_TEL,
    )
    /**
     * One key edge from the head unit. Most keys act on the press; focus keys pass both edges on,
     * so a held D-pad key repeats the way it would anywhere else. Returns false for a key nothing
     * here knows, for the caller to log.
     */
    fun onKey(keyCode: Int, down: Boolean, longPress: Boolean): Boolean {
        if (keyCode in FOCUS_KEYS) {
            focusSink?.invoke(keyCode, down)
            return true
        }
        if (!down) return keyCode in WANTED
        val media = CarServices.media
        when (keyCode) {
            KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE -> media.togglePlay()
            KeyEvent.KEYCODE_MEDIA_PLAY -> if (!media.now.value.playing) media.togglePlay()
            KeyEvent.KEYCODE_MEDIA_PAUSE, KeyEvent.KEYCODE_MEDIA_STOP -> if (media.now.value.playing) media.togglePlay()
            KeyEvent.KEYCODE_MEDIA_NEXT -> media.next()
            KeyEvent.KEYCODE_MEDIA_PREVIOUS -> media.previous()
            KeyEvent.KEYCODE_SEARCH, KeyEvent.KEYCODE_VOICE_ASSIST -> voice()
            KeyEvent.KEYCODE_CALL -> call()
            KeyEvent.KEYCODE_ENDCALL -> endCall()
            KeyEvent.KEYCODE_BACK -> screen(ScreenKey.BACK)
            KeyEvent.KEYCODE_HOME -> screen(ScreenKey.HOME)
            KEYCODE_NAVIGATION -> screen(ScreenKey.MAP)
            KEYCODE_MEDIA -> screen(ScreenKey.MEDIA)
            KEYCODE_TEL -> screen(ScreenKey.PHONE)
            else -> return false
        }
        if (longPress) GearslipLog.i("keys: long press on $keyCode")
        return true
    }
    /** A turn of the rotary knob: each click moves focus one step, like Tab or Shift+Tab. */
    fun onRotate(delta: Int) {
        val sink = focusSink ?: return
        val code = if (delta > 0) KeyEvent.KEYCODE_TAB else KEYCODE_SHIFT_TAB
        repeat(kotlin.math.abs(delta).coerceAtMost(MAX_ROTARY_STEPS)) {
            sink(code, true)
            sink(code, false)
        }
    }
    /**
     * The voice key: answers the message on screen if there is one, otherwise starts the
     * assistant when it's turned on.
     */
    private fun voice() = main.post {
        if (VoiceReply.onVoiceKey()) return@post
        if (CarSettings.experimentalFeaturesEnabled.value && CarSettings.voiceAssistantEnabled.value) {
            CarAssistant.start()
        } else {
            GearslipLog.i("keys: voice pressed, but the assistant is off in settings")
        }
    }
    /** Answers a ringing call; with nothing ringing, opens the phone screen. */
    private fun call() = main.post {
        val context = appContext ?: return@post
        if (CarCalls.state.value is CallUiState.Ringing) CarCalls.answer(context) else screen(ScreenKey.PHONE)
    }
    private fun endCall() = main.post {
        if (CarCalls.state.value is CallUiState.Ringing) CarCalls.decline()
        else GearslipLog.i("keys: end call pressed with no ringing call; hanging up needs the dialer")
    }
    private fun screen(key: ScreenKey) { _screenKeys.tryEmit(key) }
    // aap_protobuf's KeyCode.proto: car-only keys past the end of Android's own range.
    const val KEYCODE_ROTARY_CONTROLLER = 65536
    const val KEYCODE_MEDIA = 65537
    const val KEYCODE_NAVIGATION = 65538
    const val KEYCODE_TEL = 65540
    /** Stands in for Shift+Tab: the sink sends Tab with the shift meta state. */
    const val KEYCODE_SHIFT_TAB = -KeyEvent.KEYCODE_TAB
    private const val MAX_ROTARY_STEPS = 5
    private val FOCUS_KEYS = setOf(
        KeyEvent.KEYCODE_DPAD_UP, KeyEvent.KEYCODE_DPAD_DOWN, KeyEvent.KEYCODE_DPAD_LEFT,
        KeyEvent.KEYCODE_DPAD_RIGHT, KeyEvent.KEYCODE_DPAD_CENTER, KeyEvent.KEYCODE_ENTER,
    )
 }
@@ -0,0 +1,397 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.drawable.toBitmap
 import android.content.Context
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.ui.graphics.Color
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.background
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.lazy.grid.GridItemSpan
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Warning
 import app.seb3thehacker.gearslip.host.KnownApps
 import app.seb3thehacker.gearslip.host.CarAppCatalog
 import app.seb3thehacker.gearslip.host.TemplateApp
 import app.seb3thehacker.gearslip.media.MediaApp
 import app.seb3thehacker.gearslip.media.MediaCatalog
 import app.seb3thehacker.gearslip.notify.MessagingApp
 import app.seb3thehacker.gearslip.notify.MessagingCatalog
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 /** One tile on the launcher: either a phone app's own icon or a built-in glyph. */
 private class Tile(
    val label: String,
    val icon: ImageBitmap? = null,
    val glyph: ImageVector? = null,
    /** Tested from start to finish with Gearslip; drawn with a check mark. */
    val verified: Boolean = false,
    /** Known not to work; drawn with a red X instead of being left off the launcher. */
    val broken: Boolean = false,
    /** Starts and can be used, but rough enough not to call working; drawn with a yellow mark. */
    val partial: Boolean = false,
    val onLongClick: (() -> Unit)? = null,
    val onClick: () -> Unit,
 )
 /** A launcher app's data, kept apart from [Tile] so it can be cached without capturing click state. */
 internal class Entry(
    val label: String,
    val icon: ImageBitmap?,
    val template: TemplateApp? = null,
    val media: MediaApp? = null,
    val builtIn: BuiltInApp? = null,
    val messaging: MessagingApp? = null,
 ) {
    /** What a pin or a nav-bar shortcut remembers this entry as; null for nothing pinnable. */
    val componentId: String?
        get() = builtIn?.let { BUILT_IN_PREFIX + it.id }
            ?: messaging?.let { MESSAGING_PREFIX + it.packageName }
            ?: (template?.component ?: media?.component)?.flattenToString()
    val packageName: String?
        get() = template?.component?.packageName ?: media?.component?.packageName ?: messaging?.packageName
 }
 /** A messaging app has no component of its own to open, so its pin carries the package instead. */
 internal const val MESSAGING_PREFIX = "messages:"
 /**
 * The installed car and media apps with their icons. Scanning the package manager and decoding
 * icons is slow, so [Prefetch] does it ahead of time and again at the start of each car session,
 * which is when new installs are picked up.
 */
 internal object LauncherCache {
    /** Observed, not read once: the nav bar is drawn before the car session's rescan finishes,
     * and an app installed since the last scan has to show up there when it does. */
    private val flow = MutableStateFlow<List<Entry>?>(null)
    val state: StateFlow<List<Entry>?> = flow.asStateFlow()
    val entries: List<Entry>? get() = flow.value
    /** Returns the scan if there is one; [force] rescans. Synchronized so two callers share one scan. */
    @Synchronized
    fun load(context: Context, force: Boolean = false): List<Entry> {
        if (!force) entries?.let { return it }
        fun iconOf(pkg: String) = runCatching {
            context.packageManager.getApplicationIcon(pkg).toBitmap(128, 128).asImageBitmap()
        }.getOrNull()
        val navApps = CarAppCatalog.installed(context)
        val mediaApps = MediaCatalog.installed(context)
        // Some apps (Spotify among them) ship both a Car App Library template and a legacy
        // MediaBrowserService, which otherwise land as two identically-labeled tiles with no
        // way to tell them apart. They're genuinely different screens - browsing versus Now
        // Playing - so only the label needs disambiguating, not the tile itself.
        val mediaPackages = mediaApps.map { it.component.packageName }.toSet()
        val messagingApps = MessagingCatalog.installed(context)
        // Google Messages ships its own car app, which won't start under Gearslip. Gearslip's
        // own Messages screen does the same job, so a messenger gets only that tile.
        val messagingPackages = messagingApps.map { it.packageName }.toSet()
        val nav = navApps
            .filter { it.component.packageName !in messagingPackages }
            // An app whose template screen is rejected but whose player works through Gearslip
            // (Spotify) shows only its player tile - a "· Browse" tile beside it would just report
            // that the car screen isn't supported.
            .filter { !(KnownApps.screenBroken(it.component.packageName) && KnownApps.playerWorks(it.component.packageName)) }
            .map {
                val label = if (it.component.packageName in mediaPackages) "${it.label} · Browse" else it.label
                Entry(label, iconOf(it.component.packageName), template = it)
            }
        val media = mediaApps.map { Entry(it.label, iconOf(it.component.packageName), media = it) }
        // A messenger that is also a car media app keeps only its player tile.
        val messaging = messagingApps
            .filter { it.packageName !in mediaPackages }
            .map { Entry(it.label, iconOf(it.packageName), messaging = it) }
        return (nav + media + messaging).sortedBy { it.label.lowercase() }.also { flow.value = it }
    }
 }
 /** Every app the launcher knows: Gearslip's own and the installed ones, rescans included. */
@Composable
 internal fun rememberAllEntries(): List<Entry> {
    val context = LocalContext.current
    val installed by LauncherCache.state.collectAsState()
    LaunchedEffect(context) {
        if (LauncherCache.entries == null) withContext(Dispatchers.IO) { LauncherCache.load(context) }
    }
    return remember(installed) { BuiltInApps.entries + installed.orEmpty() }
 }
 /** The launcher's groups, in the order they're laid out. */
 private enum class AppGroup { PHONE, MAPS, MUSIC, MESSAGING, WEB, SCREEN_SHARING, OTHER, SETTINGS }
 private fun groupOf(entry: Entry, mediaPackages: Set<String>): AppGroup {
    entry.builtIn?.let {
        return when (it) {
            BuiltInApps.Phone -> AppGroup.PHONE
            BuiltInApps.Web -> AppGroup.WEB
            BuiltInApps.ScreenSharing -> AppGroup.SCREEN_SHARING
            else -> AppGroup.SETTINGS
        }
    }
    if (entry.media != null) return AppGroup.MUSIC
    if (entry.messaging != null) return AppGroup.MESSAGING
    val app = entry.template ?: return AppGroup.OTHER
    // A media app's "· Browse" tile sits next to its player.
    if (app.component.packageName in mediaPackages) return AppGroup.MUSIC
    return when (app.kind) {
        "calling" -> AppGroup.PHONE
        "navigation", "poi", "parking", "charging" -> AppGroup.MAPS
        "messaging" -> AppGroup.MESSAGING
        "settings" -> AppGroup.SETTINGS
        else -> AppGroup.OTHER
    }
 }
 /**
 * The launcher's tiles in the order they're drawn: grouped by [AppGroup], alphabetical inside a
 * group with Settings last of all, then with the driver's own moves from [custom] laid over it.
 * Moved apps only trade places among themselves, so an app installed later still lands in its group.
 */
 internal fun launcherOrder(all: List<Entry>, showVehicleData: Boolean, custom: List<String>): List<Entry> {
    val shown = all.filter { it.builtIn !== BuiltInApps.VehicleData || showVehicleData }
    val mediaPackages = shown.mapNotNull { it.media?.component?.packageName }.toSet()
    val grouped = shown.sortedWith(
        compareBy<Entry>({ groupOf(it, mediaPackages) }, { it.builtIn === BuiltInApps.Settings }, { it.label.lowercase() }),
    )
    if (custom.isEmpty()) return grouped
    val rank = custom.withIndex().associate { (i, id) -> id to i }
    fun Entry.rank() = componentId?.let { rank[it] }
    val moved = grouped.filter { it.rank() != null }.sortedBy { it.rank() }.iterator()
    return grouped.map { if (it.rank() != null) moved.next() else it }
 }
 /** An app by the id a pin or the running list knows it by, built-in or installed. */
 internal fun findEntry(id: String): Entry? =
    BuiltInApps.entries.find { it.componentId == id } ?: LauncherCache.entries?.find { it.componentId == id }
 /** Rescans the car and media apps now, replacing the cached list; the launcher keeps showing the old one meanwhile. */
 fun warmLauncherApps(context: Context) { LauncherCache.load(context, force = true) }
 /**
 * Connects or opens [entry] - what tapping its tile does, shared with the nav bar's pinned
 * shortcuts and its open-app icon so there is exactly one place that knows how to launch either
 * kind of app.
 */
 internal fun launchEntry(entry: Entry, navigator: CarNavigator, frame: CarEnvironment.Frame) {
    entry.builtIn?.let { it.open(navigator); return }
    entry.template?.let {
        if (it.isNavigation) {
            CarServices.connectNav(it, frame)
            navigator.home()
        } else {
            CarServices.connectBrowse(it, frame)
            navigator.browse(entry.label)
        }
    }
    entry.media?.let { CarServices.openMedia(it); navigator.media() }
    entry.messaging?.let { navigator.messages(it.packageName, it.label) }
 }
 /** The app launcher: every app as an icon grid, grouped Phone, Maps, Music, Messaging, Web, Screen sharing, Settings. */
@Composable
 fun CarLauncher() {
    val navigator = LocalCarNavigator.current
    val frame by CarEnvironment.frame.collectAsState()
    // Painted from the cache at once; scanned only if [Prefetch] has not got there first.
    val all = rememberAllEntries()
    val running = rememberRunningApps()
    val showVehicleData = rememberVehicleDataShown()
    var showBadgeKey by remember { mutableStateOf(false) }
    fun tileOf(entry: Entry): Tile {
        // The badges rate an app's own car screens; a messenger shown on Gearslip's own Messages
        // screen has none, so it gets no badge.
        val pkg = entry.packageName?.takeIf { entry.messaging == null }
        val id = entry.componentId
        return Tile(
            entry.label, entry.icon, entry.builtIn?.glyph,
            verified = pkg != null && (KnownApps.works(pkg) || (entry.media != null && KnownApps.playerWorks(pkg))),
            broken = pkg != null && (KnownApps.isBroken(pkg) || (entry.template != null && KnownApps.screenBroken(pkg))),
            partial = pkg != null && KnownApps.isPartial(pkg),
            onLongClick = id?.let { { navigator.showAppMenu(it) } },
        ) { openApp(entry, id?.let { running[it] }, navigator, frame) }
    }
    val appOrder by CarSettings.appOrder.collectAsState()
    val tiles = launcherOrder(all, showVehicleData, appOrder).map(::tileOf)
    LazyVerticalGrid(
        columns = GridCells.Adaptive(minSize = 108.dp),
        modifier = Modifier.fillMaxSize(),
        contentPadding = PaddingValues(20.dp),
        horizontalArrangement = Arrangement.spacedBy(12.dp),
        verticalArrangement = Arrangement.spacedBy(12.dp),
    ) {
        items(tiles) { AppTile(it) }
        if (tiles.any { it.verified || it.broken || it.partial }) {
            // Folded away behind one button: it's reference, read once, not something every
            // visit to the launcher needs spelled out under the grid.
            item(span = { GridItemSpan(maxLineSpan) }) {
                Column(horizontalAlignment = Alignment.CenterHorizontally) {
                    GsButton(onClick = { showBadgeKey = !showBadgeKey }, tone = GsTone.Neutral) {
                        Icon(Icons.Filled.Info, contentDescription = null, modifier = Modifier.size(18.dp))
                        Spacer(Modifier.width(8.dp))
                        Text(if (showBadgeKey) "Hide badge key" else "What the badges mean")
                    }
                    if (showBadgeKey) {
                        BadgeLegend(
                            verified = tiles.any { it.verified },
                            partial = tiles.any { it.partial },
                            broken = tiles.any { it.broken },
                        )
                    }
                }
            }
        }
    }
 }
 /** Says what each badge on a tile means, once, under the grid - only the ones actually in use. */
@Composable
 private fun BadgeLegend(verified: Boolean, partial: Boolean, broken: Boolean) {
    Column(
        Modifier.fillMaxWidth().padding(top = 4.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(4.dp),
    ) {
        if (verified) LegendRow(size = 16.dp, badge = { VerifiedBadge(it) }, text = "Tested and working with Gearslip")
        if (partial) LegendRow(size = 16.dp, badge = { PartialBadge(it) }, text = "Runs, but not cleanly, with Gearslip")
        if (broken) LegendRow(size = 16.dp, badge = { BrokenBadge(it) }, text = "Doesn't work with Gearslip yet")
    }
 }
@Composable
 private fun LegendRow(size: androidx.compose.ui.unit.Dp, badge: @Composable (androidx.compose.ui.unit.Dp) -> Unit, text: String) {
    Row(horizontalArrangement = Arrangement.Center, verticalAlignment = Alignment.CenterVertically) {
        badge(size)
        Spacer(Modifier.width(8.dp))
        Text(text, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
    }
 }
 /** A green disc with a white check: the same mark on every tile and in the legend. */
@Composable
 private fun VerifiedBadge(size: androidx.compose.ui.unit.Dp, modifier: Modifier = Modifier) {
    Box(
        modifier.size(size).background(Color(0xFF43A047), CircleShape),
        contentAlignment = Alignment.Center,
    ) {
        Icon(Icons.Filled.Check, contentDescription = "Tested and working", tint = Color.White, modifier = Modifier.size(size * 0.66f))
    }
 }
 /** A red disc with a white X: marks a tile known not to work with Gearslip yet. */
@Composable
 private fun BrokenBadge(size: androidx.compose.ui.unit.Dp, modifier: Modifier = Modifier) {
    Box(
        modifier.size(size).background(Color(0xFFD32F2F), CircleShape),
        contentAlignment = Alignment.Center,
    ) {
        Icon(Icons.Filled.Close, contentDescription = "Doesn't work with Gearslip", tint = Color.White, modifier = Modifier.size(size * 0.66f))
    }
 }
 /** A yellow disc with a warning mark: neither the check nor the X, since this app runs but isn't clean about it. */
@Composable
 private fun PartialBadge(size: androidx.compose.ui.unit.Dp, modifier: Modifier = Modifier) {
    Box(
        modifier.size(size).background(Color(0xFFF9A825), CircleShape),
        contentAlignment = Alignment.Center,
    ) {
        Icon(Icons.Filled.Warning, contentDescription = "Works, but not cleanly, with Gearslip", tint = Color.White, modifier = Modifier.size(size * 0.6f))
    }
 }
@OptIn(ExperimentalFoundationApi::class)
@Composable
 private fun AppTile(tile: Tile) {
    val shape = MaterialTheme.shapes.extraLarge
    // A long press opens the app's menu (pin, close) - the same gesture everywhere apps are
    // shown, here and on the nav bar.
    GsIconBox(
        onClick = tile.onClick,
        onLongClick = tile.onLongClick,
        modifier = Modifier.height(120.dp),
        colors = GsColors(MaterialTheme.colorScheme.surfaceVariant, MaterialTheme.colorScheme.onSurfaceVariant),
        shape = shape,
    ) {
        Box(Modifier.fillMaxSize()) {
            Column(
                Modifier.fillMaxSize().padding(8.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.Center,
            ) {
                when {
                    tile.icon != null -> Image(tile.icon, contentDescription = null, modifier = Modifier.size(52.dp))
                    tile.glyph != null -> Icon(tile.glyph, contentDescription = null, modifier = Modifier.size(52.dp))
                }
                Spacer(Modifier.height(8.dp))
                Text(
                    tile.label,
                    style = MaterialTheme.typography.labelLarge,
                    fontWeight = FontWeight.SemiBold,
                    textAlign = TextAlign.Center,
                    maxLines = 2,
                    overflow = TextOverflow.Ellipsis,
                )
            }
            if (tile.verified) {
                VerifiedBadge(24.dp, Modifier.align(Alignment.TopEnd).padding(8.dp))
            }
            if (tile.broken) {
                BrokenBadge(24.dp, Modifier.align(Alignment.TopEnd).padding(8.dp))
            }
            if (tile.partial) {
                PartialBadge(24.dp, Modifier.align(Alignment.TopEnd).padding(8.dp))
            }
        }
    }
 }
@@ -0,0 +1,156 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.staticCompositionLocalOf
 sealed interface CarScreen {
    data object Home : CarScreen
    data object Settings : CarScreen
    data object Apps : CarScreen
    /** Opened from the clock: the day's calendar and the weather, nothing that needs a keyboard. */
    data object Dashboard : CarScreen
    /** Opened from the weather chip or the dashboard: now, the next hours and the week. */
    data object Weather : CarScreen
    /** Everything the head unit's sensor channel has advertised and sent, raw. */
    data object VehicleData : CarScreen
    /** The current media app, full size: browse, lyrics and controls. */
    data object Media : CarScreen
    /**
     * A templated app that isn't a navigation app - Spotify's own Car App Library service, among
     * others - opened on its own screen rather than the Home map slot, which only a genuine
     * navigation app can claim.
     */
    data object Browse : CarScreen
    /** A messaging app's recent conversations, read from the notifications it posts. */
    data class Messages(val packageName: String) : CarScreen
    /** [replyTo] is a notification key to open straight into its reply pane. */
    data class Notifications(val replyTo: String? = null) : CarScreen
    data class App(val id: String) : CarScreen
 }
 enum class SidePanel { NONE, CONTROLS, LYRICS }
 /** One step on the breadcrumb trail: the screen it shows and the word for it in the trail. */
 data class Crumb(val screen: CarScreen, val label: String)
 /**
 * Where the car UI is, and how it got there. A car touchscreen has no hardware back button, so
 * every screen that isn't reached from [home] is pushed onto a trail (like a browser's history,
 * or a file manager's breadcrumb bar) rather than replacing the last one outright - that's what
 * lets the breadcrumb bar show "Home > Apps > Settings" and jump straight back to any of them,
 * and lets [back] undo exactly one step instead of always dumping you back at Home. An open app
 * can claim a back step first (a browser going back a page) through [backInterceptor].
 */
 class CarNavigator(startId: String) {
    private val stack = mutableStateListOf(
        Crumb(
            if (CarApps.find(startId) != null) CarScreen.App(startId) else CarScreen.Home,
            "Home",
        ),
    )
    /** The whole trail, root first. Size 1 means "at Home" - the breadcrumb bar hides then. */
    val trail: List<Crumb> get() = stack
    val current: CarScreen get() = stack.last().screen
    var backInterceptor: (() -> Boolean)? = null
    /** Pushes a new step, unless it's the same screen already on top - tapping the button for
     * where you already are shouldn't grow the trail. */
    private fun push(screen: CarScreen, label: String) {
        if (stack.last().screen == screen) return
        stack.add(Crumb(screen, label))
    }
    /** The one way back to a clean slate: resets the whole trail to just Home. */
    fun home() {
        stack.clear()
        stack.add(Crumb(CarScreen.Home, "Home"))
    }
    /**
     * What the column beside the map on Home is showing, if anything. The player lives in one
     * place at a time: with [SidePanel.CONTROLS] it moves into the column and the nav bar's pill
     * steps aside; with [SidePanel.LYRICS] the column is all lyrics and the pill comes back.
     * Every other screen has no room for the column, so there the pill stays in the nav bar.
     */
    var sidePanel by mutableStateOf(SidePanel.NONE)
        private set
    /**
     * The pill's dock button: moves the player beside the map, going Home first if need be. With
     * lyrics already there it swaps them for the controls; with the controls there it closes.
     */
    fun togglePlayerDock() {
        if (current != CarScreen.Home) {
            sidePanel = SidePanel.CONTROLS
            home()
            return
        }
        sidePanel = if (sidePanel == SidePanel.CONTROLS) SidePanel.NONE else SidePanel.CONTROLS
    }
    fun showSideLyrics() { sidePanel = SidePanel.LYRICS }
    fun closeSidePanel() { sidePanel = SidePanel.NONE }
    /** Component id of the app whose long-press menu (pin, close) is open, or null. */
    var appMenu by mutableStateOf<String?>(null)
        private set
    fun showAppMenu(componentId: String) { appMenu = componentId }
    fun dismissAppMenu() { appMenu = null }
    fun media() { push(CarScreen.Media, "Media") }
    fun browse(label: String) { push(CarScreen.Browse, label) }
    fun apps() { push(CarScreen.Apps, "Apps") }
    fun settings() { push(CarScreen.Settings, "Settings") }
    fun dashboard() { push(CarScreen.Dashboard, "Dashboard") }
    fun weather() { push(CarScreen.Weather, "Weather") }
    fun vehicleData() { push(CarScreen.VehicleData, "Vehicle data") }
    fun messages(packageName: String, label: String) { push(CarScreen.Messages(packageName), label) }
    /** The list lives on the dashboard; only a reply gets a screen of its own. */
    fun notifications(replyTo: String? = null) {
        if (replyTo == null) dashboard() else push(CarScreen.Notifications(replyTo), "Reply")
    }
    fun open(id: String) { push(CarScreen.App(id), CarApps.find(id)?.label ?: id) }
    /** Jumps straight to a step already on the trail, dropping everything after it - what
     * tapping a breadcrumb does. Index 0 (Home) is always on the trail, so this always succeeds. */
    fun jumpTo(index: Int) {
        while (stack.size > index + 1) stack.removeAt(stack.lastIndex)
    }
    /** One step back, same as tapping the crumb before the current one. */
    fun back() {
        if (backInterceptor?.invoke() == true) return
        if (stack.size > 1) stack.removeAt(stack.lastIndex)
    }
 }
 val LocalCarNavigator = staticCompositionLocalOf<CarNavigator> { error("no CarNavigator provided") }
 /** "Is it dark outside", for apps that adapt to it. See [CarEnvironment]. */
 val LocalDarkOutside = staticCompositionLocalOf { false }
@@ -0,0 +1,95 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.Protobuf
 import app.seb3thehacker.gearslip.Wire
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 /**
 * Everything the head unit's sensor channel has offered and sent, for the "Vehicle data" screen.
 *
 * [ServiceDiscovery.findSensorService] tells us which numeric sensor types this head unit is
 * willing to stream; [SensorType] names the ones publicly documented by other AA reverse-engineering
 * projects (aasdk, openauto). That mapping is carried over from other projects, not verified
 * against this exact unit, so it's a label, not a guarantee - the raw field dump next to it is
 * the ground truth. Once [onEvent] starts decoding real traffic from the 2018 Uconnect, correct
 * any type that turns out to be mislabeled.
 */
 object CarSensors {
    data class Reading(val typeId: Int, val typeName: String, val raw: String, val updatedAtMs: Long)
    private val readingsFlow = MutableStateFlow<List<Reading>>(emptyList())
    val readings: StateFlow<List<Reading>> = readingsFlow
    /** Seeds one row per sensor type the head unit advertised, so the screen shows what's on
     * offer even before the first event for it arrives. */
    fun onDiscovered(types: List<Int>) {
        readingsFlow.value = types.map { id ->
            Reading(id, SensorType.name(id), "(waiting for data)", 0L)
        }
    }
    /**
     * One SensorEventIndication. Every reverse-engineered version of this message multiplexes
     * every sensor type into one shared set of message-level field numbers (field N = "the data
     * for sensor type N", roughly) rather than tagging events with the type id from
     * SensorType.type - so field number is read here as a best-effort type id, same as the
     * other services in this file.
     */
    fun onEvent(body: ByteArray) {
        val now = System.currentTimeMillis()
        val fields = Wire.fields(body)
        val byType = fields.groupBy { it.number }
        val updated = byType.mapValues { (number, group) ->
            Reading(
                number,
                SensorType.name(number),
                group.joinToString("; ") { field ->
                    field.bytes?.let { Protobuf.describe(it, indent = "").trim().replace("\n", ", ") }
                        ?: "varint=${field.varint}"
                },
                now,
            )
        }
        val existing = readingsFlow.value.associateBy { it.typeId }
        readingsFlow.value = (existing + updated).values.sortedBy { it.typeId }
    }
    fun clear() {
        readingsFlow.value = emptyList()
    }
 }
 /**
 * Sensor type ids as named across public Android Auto reverse-engineering references. Treated as
 * a label, not a fact - see [CarSensors] doc.
 */
 object SensorType {
    private val NAMES = mapOf(
        1 to "Location (GPS)",
        2 to "Compass",
        3 to "Speed",
        4 to "RPM",
        5 to "Odometer",
        6 to "Fuel",
        7 to "Parking brake",
        8 to "Gear",
        9 to "Diagnostics",
        10 to "Night mode",
        11 to "Environment",
        12 to "HVAC",
        13 to "Driving status",
        14 to "Dead reckoned location",
        15 to "Passenger",
        16 to "Door",
        17 to "Light",
        18 to "Tire pressure",
        19 to "Accelerometer",
        20 to "Gyroscope",
        21 to "Gravity",
        22 to "Wheel tick / distance",
    )
    fun name(id: Int): String = NAMES[id]?.let { "$it (#$id)" } ?: "Sensor #$id"
 }
@@ -0,0 +1,209 @@
 package app.seb3thehacker.gearslip.car
 import android.content.ComponentName
 import android.content.Context
 import android.media.session.MediaSessionManager
 import android.media.session.PlaybackState
 import app.seb3thehacker.gearslip.audio.CarAudio
 import app.seb3thehacker.gearslip.host.CarAppCatalog
 import app.seb3thehacker.gearslip.host.CarAppConnection
 import app.seb3thehacker.gearslip.host.KnownApps
 import app.seb3thehacker.gearslip.host.TemplateApp
 import app.seb3thehacker.gearslip.media.CarMedia
 import app.seb3thehacker.gearslip.media.MediaApp
 import app.seb3thehacker.gearslip.media.MediaCatalog
 import app.seb3thehacker.gearslip.notify.GearslipNotificationListener
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.withContext
 /**
 * The two long-lived things the car keeps running: the map app and the media app.
 *
 * They belong to the car session rather than to whichever screen is showing, so the home
 * screen, the Car apps list and the media screen all look at the same connection. Leaving a
 * screen must not drop the route being followed or the song being played.
 */
 object CarServices {
    private var context: Context? = null
    val nav: CarAppConnection by lazy { CarAppConnection(requireNotNull(context)) }
    val media: CarMedia by lazy { CarMedia(requireNotNull(context)) }
    /**
     * A second, independent connection for templated apps that aren't navigation apps - Spotify's
     * own Car App Library service is the first of these. Kept apart from [nav] so opening one
     * can never bump the map off Home: this one gets its own screen ([CarScreen.Browse]) instead.
     */
    val browse: CarAppConnection by lazy { CarAppConnection(requireNotNull(context)) }
    private val _mediaApp = MutableStateFlow<MediaApp?>(null)
    val mediaApp: StateFlow<MediaApp?> = _mediaApp.asStateFlow()
    /**
     * Whether the phone has any navigation app installed at all. True until [autostart] has
     * actually checked, so the home screen never flashes "none found" before it knows.
     */
    private val _hasNavApps = MutableStateFlow(true)
    val hasNavApps: StateFlow<Boolean> = _hasNavApps.asStateFlow()
    /** Set when the driver stops the map by hand, so going Home doesn't immediately restart it. */
    private var navStopped = false
    private var autoplayPending = false
    fun init(appContext: Context) {
        context = appContext.applicationContext
        app.seb3thehacker.gearslip.notify.CarMotion.start(appContext)
        app.seb3thehacker.gearslip.call.CarCalls.start(appContext)
        CarAssistant.init(appContext)
        CarKeys.init(appContext)
        VoiceReply.init(appContext)
        // Loaded now, while nothing's waiting on it, so the first reply isn't slower than the rest.
        app.seb3thehacker.gearslip.speech.SpeechEngine.warm(appContext)
    }
    // --- map -----------------------------------------------------------------------------
    /**
     * [destination] is a search query to start navigating to right away - "navigate to X with Y"
     * from the voice assistant - left null for a plain app launch. An app that's already the one
     * running gets the destination sent to its live session instead of being torn down and
     * rebuilt, same as [CarAppConnection.navigateTo] documents.
     */
    fun connectNav(app: TemplateApp, frame: CarEnvironment.Frame, destination: String? = null) {
        navStopped = false
        CarSettings.setLastNav(app.component.flattenToString())
        if (destination != null && nav.connectedComponent == app.component) {
            nav.navigateTo(destination)
        } else {
            nav.connect(app, frame.width, frame.height, frame.densityDpi, destination)
        }
    }
    fun stopNav() {
        navStopped = true
        nav.disconnect()
    }
    /** Undoes [stopNav]'s hold so the last map app comes back, same as it would after a restart. */
    suspend fun reconnectNav(frame: CarEnvironment.Frame) {
        navStopped = false
        autostart(frame)
    }
    // --- browse (non-navigation templated apps) -------------------------------------------
    /** Opens a templated app that isn't navigation, on its own screen - never on Home. */
    fun connectBrowse(app: TemplateApp, frame: CarEnvironment.Frame) {
        browse.connect(app, frame.width, frame.height, frame.densityDpi)
    }
    fun stopBrowse() {
        browse.disconnect()
    }
    // --- media ---------------------------------------------------------------------------
    fun openMedia(app: MediaApp, autoplay: Boolean = false) {
        CarSettings.setLastMedia(app.component.flattenToString())
        val phase = media.phase.value
        val live = phase == CarMedia.Phase.READY || phase == CarMedia.Phase.CONNECTING
        if (_mediaApp.value?.component == app.component && live) return
        _mediaApp.value = app
        autoplayPending = autoplay
        media.connect(app)
        // Not torn down and rebuilt per app: the capture covers whatever the phone plays, so
        // switching media apps never costs the driver another consent dialog.
        if (CarSettings.pipeAudio.value) CarAudio.request()
    }
    /** Closes the media app from the car: stops what it's playing and drops the connection. */
    fun closeMedia() {
        if (media.now.value.playing) media.togglePlay()
        media.disconnect()
        _mediaApp.value = null
        autoplayPending = false
    }
    /** Called once the media app is connected: starts playback if that was asked for. */
    fun autoplayIfDue() {
        if (!autoplayPending) return
        autoplayPending = false
        if (!media.now.value.playing) media.togglePlay()
    }
    // --- start and stop ------------------------------------------------------------------
    /** Brings back whatever was in use last time. Safe to call repeatedly. */
    suspend fun autostart(frame: CarEnvironment.Frame) {
        val ctx = context ?: return
        if (!navStopped && nav.status.value.phase == CarAppConnection.Phase.IDLE) {
            val navApps = withContext(Dispatchers.IO) { CarAppCatalog.installed(ctx) }
                .filter { it.isNavigation }
            _hasNavApps.value = navApps.isNotEmpty()
            // Never auto-pick one already known to fail outright - a driver who plugs in should
            // land on a map, not on the one tile marked with a red X.
            val candidates = navApps.filterNot { KnownApps.isBroken(it.component.packageName) }
            val last = CarSettings.lastNav.value
            // The one used last, or - first run, nothing on record yet - whichever comes first:
            // a driver who plugs in for the first time shouldn't have to go pick one by hand
            // before the map shows up at all.
            val lastComponent = last?.let(ComponentName::unflattenFromString)
            val app = candidates.firstOrNull { it.component == lastComponent } ?: candidates.firstOrNull()
            if (app != null) connectNav(app, frame)
        }
        if (_mediaApp.value == null) {
            val catalog = withContext(Dispatchers.IO) { MediaCatalog.installed(ctx) }
            // Something already playing on the phone wins over whatever was last used in the car -
            // a driver who started a song before plugging in shouldn't have to go open its tile by
            // hand just to see what's already going.
            val playing = withContext(Dispatchers.IO) { currentlyPlaying(ctx, catalog) }
            if (playing != null) {
                openMedia(playing)
            } else {
                val last = CarSettings.lastMedia.value
                val app = last?.let { id -> catalog.firstOrNull { it.component == ComponentName.unflattenFromString(id) } }
                if (app != null) openMedia(app, autoplay = CarSettings.autoplay.value)
            }
        }
    }
    /**
     * Whichever known car media app has an actively playing session right now, system-wide - not
     * just the one Gearslip itself last connected to. Reading another app's session needs
     * notification access, the same permission [app.seb3thehacker.gearslip.media.CarMedia]
     * already asks for to control apps that won't share their library.
     */
    private fun currentlyPlaying(ctx: Context, catalog: List<MediaApp>): MediaApp? {
        val manager = ctx.getSystemService(MediaSessionManager::class.java)
        val listener = ComponentName(ctx, GearslipNotificationListener::class.java)
        val sessions = try {
            manager.getActiveSessions(listener)
        } catch (e: SecurityException) {
            return null
        }
        val playingPackages = sessions
            .filter { it.playbackState?.state == PlaybackState.STATE_PLAYING }
            .map { it.packageName }
        return playingPackages.firstNotNullOfOrNull { pkg -> catalog.firstOrNull { it.component.packageName == pkg } }
    }
    /** The car went away: nothing should keep running for a screen that no longer exists. */
    fun shutdown() {
        context?.let { app.seb3thehacker.gearslip.notify.CarMotion.stop(it) }
        app.seb3thehacker.gearslip.call.CarCalls.stop()
        runCatching { nav.disconnect() }
        runCatching { media.disconnect() }
        runCatching { browse.disconnect() }
        CarAssistant.cancel()
        CarAudio.release()
        _mediaApp.value = null
        navStopped = false
    }
 }
@@ -0,0 +1,301 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import app.seb3thehacker.gearslip.AppSettings
 import app.seb3thehacker.gearslip.car.theme.GsTheme
 import app.seb3thehacker.gearslip.car.theme.GsThemes
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 enum class NightMode { AUTO, DAY, NIGHT }
 /** Distances and temperatures. [AUTO] goes by the phone's region. */
 enum class Units { AUTO, IMPERIAL, METRIC }
 /** Where a new message shows: [NAV_BAR] turns the clock button into it, [CARD] floats a card top right. */
 /** The car UI's own colours. Separate from [NightMode], which is about the light outside (the map). */
 enum class AppTheme { PHONE, LIGHT, DARK }
 /**
 * Settings changed from the car screen itself. Held as flows so the car UI reacts the moment a
 * button is tapped, and persisted through [AppSettings] so they survive the next connection.
 */
 object CarSettings {
    private const val KEY_SCALE = "car_scale"
    private const val KEY_OPEN = "car_open_on_connect"
    private const val KEY_NIGHT = "car_night_mode"
    private const val KEY_PIPE_AUDIO = "car_pipe_audio"
    private const val KEY_LAST_NAV = "car_last_nav"
    private const val KEY_LAST_MEDIA = "car_last_media"
    private const val KEY_AUTOPLAY = "car_autoplay"
    private const val KEY_PLAYER_TITLE = "car_player_title"
    private const val KEY_THEME = "car_app_theme"
    private const val KEY_UI_THEME = "car_ui_theme"
    private const val KEY_PINNED = "car_pinned_apps"
    private const val KEY_APP_ORDER = "car_app_order"
    private const val KEY_EXPERIMENTAL_FEATURES = "car_experimental_features"
    private const val KEY_VOICE_ASSISTANT = "car_voice_assistant"
    private const val KEY_CAR_SENSORS = "car_sensors_enabled"
    private const val KEY_SEEN_SAFETY_WARNING = "car_seen_safety_warning"
    private const val KEY_UNITS = "car_units"
    private const val KEY_WHATS_NEW = "car_whats_new_after_updates"
    private const val KEY_WHATS_NEW_SEEN = "car_whats_new_seen_code"
    /** How many shortcuts the nav bar makes room for; a driver reaching for one needs it to
     * still be on the bar, not off the edge of a long list. */
    const val MAX_PINNED = 3
    /** Id of the app to open on connect; [HOME] opens the launcher. */
    const val HOME = "home"
    private lateinit var app: Context
    private val scaleFlow = MutableStateFlow(1f)
    private val openFlow = MutableStateFlow(HOME)
    private val nightFlow = MutableStateFlow(NightMode.AUTO)
    private val pipeAudioFlow = MutableStateFlow(true)
    private val lastNavFlow = MutableStateFlow<String?>(null)
    private val lastMediaFlow = MutableStateFlow<String?>(null)
    private val autoplayFlow = MutableStateFlow(false)
    private val playerTitleFlow = MutableStateFlow(false)
    private val themeFlow = MutableStateFlow(AppTheme.PHONE)
    val appTheme: StateFlow<AppTheme> = themeFlow
    private val uiThemeFlow = MutableStateFlow(GsThemes.default.id)
    /** Id of the [GsTheme] controls are drawn in; an unknown id falls back to the default. */
    val uiTheme: StateFlow<String> = uiThemeFlow
    private val pinnedFlow = MutableStateFlow<Set<String>>(emptySet())
    private val appOrderFlow = MutableStateFlow<List<String>>(emptyList())
    private val experimentalFeaturesFlow = MutableStateFlow(false)
    private val voiceAssistantFlow = MutableStateFlow(false)
    private val carSensorsFlow = MutableStateFlow(false)
    private val seenSafetyWarningFlow = MutableStateFlow(false)
    private val unitsFlow = MutableStateFlow(Units.AUTO)
    val units: StateFlow<Units> = unitsFlow
    private val whatsNewFlow = MutableStateFlow(true)
    private val whatsNewSeenFlow = MutableStateFlow(0)
    private val whatsNewOpenFlow = MutableStateFlow(false)
    /** Whether the car screen shows what's new once after each update. */
    val whatsNewAfterUpdates: StateFlow<Boolean> = whatsNewFlow
    /** Version code whose notes the car screen last showed. */
    val whatsNewSeen: StateFlow<Int> = whatsNewSeenFlow
    /** Opened by hand from Settings, whatever the two above say. Not saved. */
    val whatsNewOpen: StateFlow<Boolean> = whatsNewOpenFlow
    fun setWhatsNewAfterUpdates(on: Boolean) {
        whatsNewFlow.value = on
        AppSettings.putString(app, KEY_WHATS_NEW, on.toString())
    }
    fun openWhatsNew() { whatsNewOpenFlow.value = true }
    /** Closes the notes and marks [versionCode]'s as read. */
    fun closeWhatsNew(versionCode: Int) {
        whatsNewOpenFlow.value = false
        whatsNewSeenFlow.value = versionCode
        AppSettings.putString(app, KEY_WHATS_NEW_SEEN, versionCode.toString())
    }
    /** Whether to show miles, feet and °F; [Units.AUTO] follows the countries that still use them. */
    fun imperial(): Boolean = when (unitsFlow.value) {
        Units.IMPERIAL -> true
        Units.METRIC -> false
        Units.AUTO -> java.util.Locale.getDefault().country in setOf("US", "LR", "MM")
    }
    fun setUnits(units: Units) {
        unitsFlow.value = units
        AppSettings.putString(app, KEY_UNITS, units.name)
        Weather.refresh(app, force = true)
    }
    /** Flattened component names of the apps long-pressed onto the nav bar as shortcuts. */
    val pinnedApps: StateFlow<Set<String>> = pinnedFlow
    /** The launcher's order once the driver has moved a tile; empty keeps the grouped default. */
    val appOrder: StateFlow<List<String>> = appOrderFlow
    /** Flattened component names of the map and media apps used last, brought back on connect. */
    val lastNav: StateFlow<String?> = lastNavFlow
    val lastMedia: StateFlow<String?> = lastMediaFlow
    /** Whether the media app starts playing by itself when the car connects. */
    val autoplay: StateFlow<Boolean> = autoplayFlow
    /**
     * The nav bar's player keeps the song title up, with play/pause and the dock button, instead of
     * settling to the skip buttons once a new song has announced itself.
     */
    val playerTitle: StateFlow<Boolean> = playerTitleFlow
    val scale: StateFlow<Float> = scaleFlow
    val openOnConnect: StateFlow<String> = openFlow
    val nightMode: StateFlow<NightMode> = nightFlow
    /**
     * Whether a media app's sound is captured and sent over the car link. On by default, since
     * sound in the car is the point of the exercise; the platform allows the capture only behind a
     * consent dialog, which [app.seb3thehacker.gearslip.audio.CarAudio] raises once the car has
     * somewhere to play it. Turned off, the app plays through the phone's normal output instead.
     */
    val pipeAudio: StateFlow<Boolean> = pipeAudioFlow
    /**
     * Off by default: a driver has to opt into experimental features as a whole before any of
     * them - the voice assistant included - show up to turn on individually.
     */
    val experimentalFeaturesEnabled: StateFlow<Boolean> = experimentalFeaturesFlow
    /**
     * The voice assistant is experimental and off by default; a driver has to turn it on
     * knowingly, from the settings screen, after reading the warning shown there. This flag
     * alone does not run the assistant - [experimentalFeaturesEnabled] must also be on.
     */
    val voiceAssistantEnabled: StateFlow<Boolean> = voiceAssistantFlow
    /**
     * Vehicle data is experimental and off by default: the launcher's tile for it, and the
     * voice assistant's "vehicle data" command, only show up once this and
     * [experimentalFeaturesEnabled] are both on. See [app.seb3thehacker.gearslip.car.CarSensors]
     * for why the raw sensor feed it shows is worth gating - the field labels are unverified.
     */
    val carSensorsEnabled: StateFlow<Boolean> = carSensorsFlow
    /**
     * Whether the car screen's own "drive safely" warning has already been shown and dismissed
     * once, from this same install. Separate from the phone side's own compat/safety dialogs -
     * a driver who only ever plugs in and never opens the phone app should still see this once,
     * on the screen they are actually about to use while driving.
     */
    val hasSeenSafetyWarning: StateFlow<Boolean> = seenSafetyWarningFlow
    fun markSafetyWarningSeen() {
        seenSafetyWarningFlow.value = true
        AppSettings.putString(app, KEY_SEEN_SAFETY_WARNING, "true")
    }
    fun init(context: Context) {
        app = context.applicationContext
        scaleFlow.value = AppSettings.getString(app, KEY_SCALE, "1.0").toFloatOrNull() ?: 1f
        openFlow.value = AppSettings.getString(app, KEY_OPEN, HOME)
        lastNavFlow.value = AppSettings.getString(app, KEY_LAST_NAV, "").ifEmpty { null }
        lastMediaFlow.value = AppSettings.getString(app, KEY_LAST_MEDIA, "").ifEmpty { null }
        themeFlow.value = runCatching {
            AppTheme.valueOf(AppSettings.getString(app, KEY_THEME, AppTheme.PHONE.name))
        }.getOrDefault(AppTheme.PHONE)
        uiThemeFlow.value = AppSettings.getString(app, KEY_UI_THEME, GsThemes.default.id)
        autoplayFlow.value = AppSettings.getString(app, KEY_AUTOPLAY, "false") == "true"
        playerTitleFlow.value = AppSettings.getString(app, KEY_PLAYER_TITLE, "false") == "true"
        pipeAudioFlow.value = AppSettings.getString(app, KEY_PIPE_AUDIO, "true") == "true"
        nightFlow.value = runCatching {
            NightMode.valueOf(AppSettings.getString(app, KEY_NIGHT, NightMode.AUTO.name))
        }.getOrDefault(NightMode.AUTO)
        pinnedFlow.value = AppSettings.getString(app, KEY_PINNED, "")
            .split(",").filter { it.isNotEmpty() }.toSet()
        appOrderFlow.value = AppSettings.getString(app, KEY_APP_ORDER, "")
            .split(",").filter { it.isNotEmpty() }
        experimentalFeaturesFlow.value = AppSettings.getString(app, KEY_EXPERIMENTAL_FEATURES, "false") == "true"
        voiceAssistantFlow.value = AppSettings.getString(app, KEY_VOICE_ASSISTANT, "false") == "true"
        carSensorsFlow.value = AppSettings.getString(app, KEY_CAR_SENSORS, "false") == "true"
        seenSafetyWarningFlow.value = AppSettings.getString(app, KEY_SEEN_SAFETY_WARNING, "false") == "true"
        unitsFlow.value = runCatching {
            Units.valueOf(AppSettings.getString(app, KEY_UNITS, Units.AUTO.name))
        }.getOrDefault(Units.AUTO)
        whatsNewFlow.value = AppSettings.getString(app, KEY_WHATS_NEW, "true") == "true"
        whatsNewSeenFlow.value = AppSettings.getString(app, KEY_WHATS_NEW_SEEN, "0").toIntOrNull() ?: 0
    }
    fun setScale(value: Float) {
        scaleFlow.value = value
        AppSettings.putString(app, KEY_SCALE, value.toString())
    }
    fun setOpenOnConnect(id: String) {
        openFlow.value = id
        AppSettings.putString(app, KEY_OPEN, id)
    }
    fun setLastNav(component: String) {
        lastNavFlow.value = component
        AppSettings.putString(app, KEY_LAST_NAV, component)
    }
    fun setLastMedia(component: String) {
        lastMediaFlow.value = component
        AppSettings.putString(app, KEY_LAST_MEDIA, component)
    }
    fun setAppTheme(theme: AppTheme) {
        themeFlow.value = theme
        AppSettings.putString(app, KEY_THEME, theme.name)
    }
    fun setUiTheme(id: String) {
        uiThemeFlow.value = id
        AppSettings.putString(app, KEY_UI_THEME, id)
    }
    fun setPlayerTitle(on: Boolean) {
        playerTitleFlow.value = on
        AppSettings.putString(app, KEY_PLAYER_TITLE, on.toString())
    }
    fun setAutoplay(on: Boolean) {
        autoplayFlow.value = on
        AppSettings.putString(app, KEY_AUTOPLAY, on.toString())
    }
    fun setPipeAudio(on: Boolean) {
        pipeAudioFlow.value = on
        AppSettings.putString(app, KEY_PIPE_AUDIO, on.toString())
    }
    fun setExperimentalFeaturesEnabled(on: Boolean) {
        experimentalFeaturesFlow.value = on
        AppSettings.putString(app, KEY_EXPERIMENTAL_FEATURES, on.toString())
    }
    fun setVoiceAssistantEnabled(on: Boolean) {
        voiceAssistantFlow.value = on
        AppSettings.putString(app, KEY_VOICE_ASSISTANT, on.toString())
    }
    fun setCarSensorsEnabled(on: Boolean) {
        carSensorsFlow.value = on
        AppSettings.putString(app, KEY_CAR_SENSORS, on.toString())
    }
    fun setNightMode(mode: NightMode) {
        nightFlow.value = mode
        AppSettings.putString(app, KEY_NIGHT, mode.name)
        CarEnvironment.refresh()
    }
    /** Long-pressed onto or off the nav bar. Silently does nothing past [MAX_PINNED] rather than
     * bumping the oldest pin - a driver who filled the bar on purpose shouldn't lose one by accident. */
    fun togglePin(component: String) {
        val current = pinnedFlow.value
        val next = when {
            component in current -> current - component
            current.size >= MAX_PINNED -> return
            else -> current + component
        }
        pinnedFlow.value = next
        AppSettings.putString(app, KEY_PINNED, next.joinToString(","))
    }
    fun setAppOrder(ids: List<String>) {
        appOrderFlow.value = ids
        AppSettings.putString(app, KEY_APP_ORDER, ids.joinToString(","))
    }
 }
@@ -0,0 +1,384 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.os.Build
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.car.theme.GsColors
 import app.seb3thehacker.gearslip.car.theme.GsIconBox
 import app.seb3thehacker.gearslip.car.theme.GsThemes
 import app.seb3thehacker.gearslip.AppSettings
 import app.seb3thehacker.gearslip.ui.CertSummary
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 /**
 * Settings that make sense while sitting in the car. The web page URL is edited here, with the
 * car's own on-screen keyboard ([CarKeyboard]); certificate management still needs a real
 * keyboard and file picker, so it stays on the phone's Settings screen.
 */
@Composable
 fun CarSettingsScreen() {
    val scale by CarSettings.scale.collectAsState()
    val open by CarSettings.openOnConnect.collectAsState()
    val night by CarSettings.nightMode.collectAsState()
    val units by CarSettings.units.collectAsState()
    val whatsNew by CarSettings.whatsNewAfterUpdates.collectAsState()
    val pipeAudio by CarSettings.pipeAudio.collectAsState()
    val autoplay by CarSettings.autoplay.collectAsState()
    val playerTitle by CarSettings.playerTitle.collectAsState()
    val theme by CarSettings.appTheme.collectAsState()
    val uiTheme by CarSettings.uiTheme.collectAsState()
    val experimentalFeatures by CarSettings.experimentalFeaturesEnabled.collectAsState()
    val voiceAssistant by CarSettings.voiceAssistantEnabled.collectAsState()
    val carSensors by CarSettings.carSensorsEnabled.collectAsState()
    val display by CarEnvironment.display.collectAsState()
    val vehicle by CarEnvironment.vehicle.collectAsState()
    val context = LocalContext.current
    val cert by produceState<CertSummary?>(null) {
        value = withContext(Dispatchers.Default) { CertSummary.read(context) }
    }
    Column(
        Modifier
            .fillMaxSize()
            .verticalScroll(rememberScrollState())
            .padding(horizontal = 24.dp, vertical = 16.dp),
        verticalArrangement = Arrangement.spacedBy(20.dp),
    ) {
        Text("Settings", style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold)
        ChoiceRow(
            "Open on connect",
            listOf(CarSettings.HOME to "Home") + CarApps.all.filter { it.id != "settings" }.map { it.id to it.label },
            open,
        ) { CarSettings.setOpenOnConnect(it) }
        ChoiceRow(
            "Size",
            listOf(1f to "Normal", 1.25f to "Large", 1.5f to "Extra large"),
            scale,
        ) { CarSettings.setScale(it) }
        ChoiceRow(
            "App theme",
            listOf(AppTheme.PHONE to "Follow phone", AppTheme.LIGHT to "Light", AppTheme.DARK to "Dark"),
            theme,
        ) { CarSettings.setAppTheme(it) }
        ChoiceRow(
            "Theme",
            GsThemes.builtIn.map { it.id to it.name },
            uiTheme,
        ) { CarSettings.setUiTheme(it) }
        ChoiceRow(
            "Map day/night",
            listOf(NightMode.AUTO to "Auto", NightMode.DAY to "Day", NightMode.NIGHT to "Night"),
            night,
        ) { CarSettings.setNightMode(it) }
        ChoiceRow(
            "Units",
            listOf(Units.AUTO to "Auto", Units.IMPERIAL to "Imperial (mi, ft, °F)", Units.METRIC to "Metric (km, m, °C)"),
            units,
        ) { CarSettings.setUnits(it) }
        ChoiceRow(
            "Player in the nav bar",
            listOf(false to "Skip buttons", true to "Song title"),
            playerTitle,
        ) { CarSettings.setPlayerTitle(it) }
        ChoiceRow(
            "Autoplay on connect",
            listOf(false to "Off", true to "On"),
            autoplay,
        ) { CarSettings.setAutoplay(it) }
        ChoiceRow(
            "Media audio",
            listOf(false to "Phone output", true to "Through Gearslip"),
            pipeAudio,
        ) { CarSettings.setPipeAudio(it) }
        Text(
            "Through Gearslip sends the sound over the USB link. Android asks for consent the " +
                "first time a media app plays in the car, and some apps refuse to be captured at " +
                "all. Phone output needs no permission: the app plays as it normally would, for " +
                "example over Bluetooth to the car.",
            style = MaterialTheme.typography.bodySmall,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
        WebPageSetting()
        ScreenFit(vehicle)
        ChoiceRow(
            "Experimental features",
            listOf(false to "Hide", true to "Show"),
            experimentalFeatures,
        ) { CarSettings.setExperimentalFeaturesEnabled(it) }
        if (experimentalFeatures) {
            ExperimentalFeaturesList(voiceAssistant, carSensors)
        }
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            Text("Connection", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
            Info("Phone", "${Build.MANUFACTURER} ${Build.MODEL}")
            Info("Vehicle", vehicle.ifEmpty { "-" })
            Info("Video", display.ifEmpty { "-" })
            Info("Certificate", cert?.headline ?: "Checking…")
        }
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            Text("About", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
            Info("Version", app.seb3thehacker.gearslip.BuildConfig.VERSION_NAME)
            Info("Build", app.seb3thehacker.gearslip.BuildConfig.VERSION_CODE.toString())
            ExperimentalFeatureRow(
                "What's new after updates",
                "Show the list of changes once, the first time the car connects after an update.",
                whatsNew,
            ) { CarSettings.setWhatsNewAfterUpdates(it) }
            GsButton(onClick = CarSettings::openWhatsNew, tone = GsTone.Tonal, modifier = Modifier.height(56.dp)) {
                Text("What's new", style = MaterialTheme.typography.titleMedium)
            }
        }
    }
 }
@Composable
 private fun <T> ChoiceRow(title: String, options: List<Pair<T, String>>, selected: T, onSelect: (T) -> Unit) {
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Text(title, style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
        Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(12.dp)) {
            options.forEach { (value, label) ->
                val on = value == selected
                val scheme = MaterialTheme.colorScheme
                GsIconBox(
                    onClick = { onSelect(value) },
                    modifier = Modifier
                        .weight(1f)
                        .height(64.dp),
                    colors = if (on) GsColors(scheme.primaryContainer, scheme.onPrimaryContainer)
                    else GsColors(scheme.surfaceContainerHigh, scheme.onSurface),
                    latched = on,
                ) {
                    Text(label, style = MaterialTheme.typography.titleMedium, fontWeight = if (on) FontWeight.Bold else FontWeight.Normal)
                }
            }
        }
    }
 }
 /**
 * Individually-switched experimental features, shown once the driver has opted into
 * experimental features as a whole. Each is its own row - a title, what it does, and a switch -
 * so the list reads fine whether there's one entry or several.
 */
@Composable
 private fun ExperimentalFeaturesList(voiceAssistant: Boolean, carSensors: Boolean) {
    Column(
        Modifier.fillMaxWidth(),
        verticalArrangement = Arrangement.spacedBy(10.dp),
    ) {
        ExperimentalFeatureRow(
            title = "Voice assistant",
            description = "Push-to-talk and the car's voice button start listening: navigate, " +
                "play media, call, or open an app by saying so. Can mishear you or act on the " +
                "wrong command - keep your eyes on the road, and confirm anything it does " +
                "before you rely on it.",
            warning = true,
            checked = voiceAssistant,
        ) { CarSettings.setVoiceAssistantEnabled(it) }
        ExperimentalFeatureRow(
            title = "Vehicle data",
            description = "Adds a Vehicle data tile: a live, raw dump of the head unit's sensor " +
                "channel. Field labels (speed, RPM, fuel...) are carried over from other " +
                "reverse-engineering projects and unverified against this car - treat them as a " +
                "guess, not a fact, until you've watched one change for yourself.",
            checked = carSensors,
        ) { CarSettings.setCarSensorsEnabled(it) }
    }
 }
@Composable
 private fun ExperimentalFeatureRow(
    title: String,
    description: String,
    checked: Boolean,
    warning: Boolean = false,
    onCheckedChange: (Boolean) -> Unit,
 ) {
    Surface(
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.surfaceContainerHigh,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier
                .fillMaxWidth()
                .padding(horizontal = 16.dp, vertical = 12.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Column(Modifier.weight(1f)) {
                Text(title, style = MaterialTheme.typography.titleMedium)
                Text(
                    description,
                    style = MaterialTheme.typography.bodySmall,
                    color = if (warning) MaterialTheme.colorScheme.error else MaterialTheme.colorScheme.onSurfaceVariant,
                    modifier = Modifier.padding(top = 2.dp),
                )
            }
            Spacer(Modifier.width(12.dp))
            GsSwitch(checked, onCheckedChange)
        }
    }
 }
 /** The URL (or raw HTML) the Web app shows. Edited with [CarKeyboard] - no phone in hand needed. */
@Composable
 private fun WebPageSetting() {
    val context = LocalContext.current
    var editing by remember { mutableStateOf(false) }
    var url by remember { mutableStateOf(AppSettings.startupUrl(context)) }
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Text("Web page", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
        Surface(
            onClick = { editing = !editing },
            shape = MaterialTheme.shapes.large,
            color = MaterialTheme.colorScheme.surfaceContainerHigh,
            modifier = Modifier.fillMaxWidth(),
        ) {
            Text(
                url.ifEmpty { "DuckDuckGo (default) - tap to set a different page" },
                style = MaterialTheme.typography.bodyLarge,
                color = if (url.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
                modifier = Modifier.padding(horizontal = 16.dp, vertical = 14.dp),
            )
        }
        Text(
            "Shown by the Web app on the launcher. Applies on the next connection.",
            style = MaterialTheme.typography.bodySmall,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
        if (editing) {
            CarKeyboard(
                url,
                onTextChange = {
                    url = it
                    AppSettings.setStartupUrl(context, it)
                },
                onSubmit = { editing = false },
                onDismiss = { editing = false },
            )
        }
    }
 }
@Composable
 private fun Info(label: String, value: String) {
    Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
        Text(label, style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.padding(end = 4.dp))
        Text(value, style = MaterialTheme.typography.bodyLarge)
    }
 }
 /**
 * Nudges how much of the frame the UI keeps clear at the top and bottom, live, so a car's
 * display can be fitted from the driver's seat. Save writes it to this vehicle's profile.
 */
@Composable
 private fun ScreenFit(vehicle: String) {
    val insets by CarEnvironment.insets.collectAsState()
    val context = LocalContext.current.applicationContext
    var saved by remember { mutableStateOf<String?>(null) }
    val known = vehicle.isNotEmpty() && vehicle != "Unknown vehicle"
    fun change(new: app.seb3thehacker.gearslip.Insets) {
        saved = null
        CarEnvironment.setInsets(new)
    }
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Text("Screen fit", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
        Stepper("Top", insets.top) { change(insets.copy(top = (insets.top + it).coerceAtLeast(0))) }
        Stepper("Bottom", insets.bottom) { change(insets.copy(bottom = (insets.bottom + it).coerceAtLeast(0))) }
        Text(
            "Usable height ${480 - insets.top - insets.bottom}px of 480",
            style = MaterialTheme.typography.bodyMedium,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
        GsButton(
            onClick = {
                val ok = app.seb3thehacker.gearslip.VehicleProfiles.saveInsets(context, vehicle, insets)
                saved = if (ok) "Saved to $vehicle" else "Could not save"
            },
            enabled = known,
            modifier = Modifier.fillMaxWidth().height(56.dp),
        ) { Text(if (known) "Save for this vehicle" else "No vehicle profile matched") }
        saved?.let { Text(it, style = MaterialTheme.typography.bodyMedium) }
    }
 }
@Composable
 private fun Stepper(label: String, value: Int, onStep: (Int) -> Unit) {
    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Text(label, style = MaterialTheme.typography.titleMedium, modifier = Modifier.weight(1.1f))
        StepButton("−5", Modifier.weight(1f)) { onStep(-5) }
        StepButton("−1", Modifier.weight(1f)) { onStep(-1) }
        Text(
            "${value}px",
            style = MaterialTheme.typography.titleLarge,
            modifier = Modifier.weight(1.3f),
            textAlign = androidx.compose.ui.text.style.TextAlign.Center,
        )
        StepButton("+1", Modifier.weight(1f)) { onStep(1) }
        StepButton("+5", Modifier.weight(1f)) { onStep(5) }
    }
 }
@Composable
 private fun StepButton(text: String, modifier: Modifier, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(64.dp),
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
        shape = MaterialTheme.shapes.large,
    ) {
        Text(text, style = MaterialTheme.typography.titleLarge)
    }
 }
@@ -0,0 +1,875 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.ui.graphics.lerp
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.border
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.foundation.layout.BoxScope
 import androidx.car.app.model.CarIcon
 import androidx.car.app.navigation.model.NavigationTemplate
 import androidx.car.app.navigation.model.RoutingInfo
 import app.seb3thehacker.gearslip.host.CarAppConnection
 import app.seb3thehacker.gearslip.host.display
 import app.seb3thehacker.gearslip.host.text
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.State
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.animation.animateContentSize
 import android.media.session.PlaybackState
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.input.pointer.PointerEventPass
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.style.TextOverflow
 import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.GsColors
 import app.seb3thehacker.gearslip.car.theme.GsIconBox
 import app.seb3thehacker.gearslip.car.theme.GsIconButton
 import app.seb3thehacker.gearslip.car.theme.GsButton
 import app.seb3thehacker.gearslip.car.theme.GsTone
 import app.seb3thehacker.gearslip.car.theme.gsColors
 import app.seb3thehacker.gearslip.car.theme.GsThemes
 import app.seb3thehacker.gearslip.car.theme.LocalGsTheme
 import app.seb3thehacker.gearslip.media.CarMedia
 import app.seb3thehacker.gearslip.media.MediaArt
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.Density
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.notify.CarNotifications
 import androidx.core.graphics.drawable.toBitmap
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
 import java.text.DateFormat
 import java.util.Date
 /**
 * The whole car screen: the current screen on top, the nav bar along the bottom.
 *
 * Colours follow the phone's theme (Material You). The size setting scales everything by
 * changing the density, so text, icons and touch targets grow together.
 */
@Composable
 fun CarUi() {
    val scale by CarSettings.scale.collectAsState()
    val phoneDark by CarEnvironment.phoneDark.collectAsState()
    val appTheme by CarSettings.appTheme.collectAsState()
    val uiThemeId by CarSettings.uiTheme.collectAsState()
    val mediaApp by CarServices.mediaApp.collectAsState()
    val darkOutside by CarEnvironment.darkOutside.collectAsState()
    val appContext = LocalContext.current.applicationContext
    val dark = when (appTheme) {
        AppTheme.PHONE -> phoneDark
        AppTheme.LIGHT -> false
        AppTheme.DARK -> true
    }
    val colors = if (dark) dynamicDarkColorScheme(appContext) else dynamicLightColorScheme(appContext)
    val base = LocalDensity.current
    val insets by CarEnvironment.insets.collectAsState()
    val navigator = remember { CarNavigator(CarSettings.openOnConnect.value) }
    val controlsWake = remember { MapControlsWake() }
    LaunchedEffect(controlsWake) {
        while (true) {
            delay(250)
            controlsWake.tick()
        }
    }
    remember(appContext) { Prefetch.warm(appContext, force = true); CarServices.init(appContext) }
    DisposableEffect(Unit) { onDispose { CarServices.shutdown() } }
    // The map follows the light outside, whatever the app's own theme is set to.
    LaunchedEffect(darkOutside) { CarServices.nav.pushConfiguration() }
    // The one place with a navigator and a frame to act a voice command on - CarAssistant itself
    // only knows how to listen and speak, not what "open Spotify" means.
    val frameForAssistant by CarEnvironment.frame.collectAsState()
    LaunchedEffect(navigator) {
        CarAssistant.pendingCommand.collect { heard ->
            if (heard != null) {
                val reply = AssistantCommands.handle(appContext, navigator, frameForAssistant, heard)
                CarAssistant.reply(reply)
            }
        }
    }
    // The car's own back, home, map, media and phone keys.
    LaunchedEffect(navigator) {
        CarKeys.screenKeys.collect { key ->
            when (key) {
                CarKeys.ScreenKey.BACK -> when {
                    navigator.appMenu != null -> navigator.dismissAppMenu()
                    VoiceReply.state.value.phase != VoiceReply.Phase.IDLE -> VoiceReply.cancel()
                    else -> navigator.back()
                }
                CarKeys.ScreenKey.HOME, CarKeys.ScreenKey.MAP -> navigator.home()
                CarKeys.ScreenKey.MEDIA -> if (CarServices.mediaApp.value != null) navigator.media() else navigator.apps()
                CarKeys.ScreenKey.PHONE -> BuiltInApps.Phone.open(navigator)
            }
        }
    }
    CompositionLocalProvider(
        LocalDensity provides Density(base.density * scale, base.fontScale),
        LocalCarNavigator provides navigator,
        LocalDarkOutside provides darkOutside,
        LocalMapControlsWake provides controlsWake,
        LocalGsTheme provides GsThemes.byId(uiThemeId),
    ) {
        MaterialTheme(colorScheme = colors) {
            Surface(
                Modifier
                    .fillMaxSize()
                    // Watches every touch without taking any: first in line, consumes nothing.
                    .pointerInput(controlsWake) {
                        awaitPointerEventScope {
                            while (true) {
                                awaitPointerEvent(PointerEventPass.Initial)
                                controlsWake.touch()
                            }
                        }
                    },
                color = MaterialTheme.colorScheme.background,
            ) {
                // Insets are in video-frame pixels, so convert with the un-scaled density.
                val pad = with(base) {
                    PaddingValues(
                        start = insets.left.toDp(), top = insets.top.toDp(),
                        end = insets.right.toDp(), bottom = insets.bottom.toDp(),
                    )
                }
                val screen = navigator.current
                val safetyWarningSeen by CarSettings.hasSeenSafetyWarning.collectAsState()
                Box(Modifier.fillMaxSize().padding(pad)) {
                Column(Modifier.fillMaxSize()) {
                    if (!safetyWarningSeen) {
                        CarSafetyWizard(onDone = CarSettings::markSafetyWarningSeen)
                        return@Column
                    }
                    // Header navigation (breadcrumb trail) - off for now, kept to tweak later.
                    // BreadcrumbBar(navigator)
                    Box(Modifier.weight(1f).fillMaxWidth()) {
                        // Home never leaves the composition; other screens cover it. Dropping it
                        // would tear down the map's surface, and coming back would then show black
                        // while the nav app redrew on a new one.
                        CarHome()
                        if (screen != CarScreen.Home) {
                            Box(
                                Modifier
                                    .fillMaxSize()
                                    .background(MaterialTheme.colorScheme.background)
                                    // Keeps touches that miss this screen's controls off the map.
                                    .pointerInput(Unit) { detectTapGestures { } },
                            ) {
                                when (screen) {
                                    CarScreen.Home -> Unit
                                    CarScreen.Apps -> CarLauncher()
                                    CarScreen.Media -> mediaApp?.let { MediaScreen(it) { navigator.back() } }
                                    CarScreen.Browse -> BrowseAppScreen(navigator)
                                    CarScreen.Settings -> CarSettingsScreen()
                                    CarScreen.Dashboard -> CarDashboardScreen()
                                    CarScreen.Weather -> WeatherScreen()
                                    CarScreen.VehicleData -> VehicleDataScreen()
                                    is CarScreen.Notifications -> NotificationsScreen(screen.replyTo)
                                    is CarScreen.Messages -> MessagesScreen(screen.packageName)
                                    is CarScreen.App -> CarApps.find(screen.id)?.content?.invoke()
                                }
                            }
                        }
                        PopupTimer()
                        // The dashboard is already listing them, so it needs no popup.
                        NotificationPopup(
                            showNew = screen !is CarScreen.Notifications && screen != CarScreen.Dashboard,
                            modifier = Modifier.align(Alignment.TopEnd),
                        )
                        // Above the popup: a call is more urgent than any notification.
                        CallOverlay(Modifier.align(Alignment.TopCenter))
                        AssistantOverlay(Modifier.align(Alignment.TopCenter))
                        if (app.seb3thehacker.gearslip.BuildConfig.DEBUG) {
                            // Bottom corner, not top: a screen's own header almost always puts
                            // something in the top-right (settings, search, a Liked Songs
                            // shortcut) and this badge used to sit right on top of it, hiding
                            // whatever the screen drew there.
                            DevBuildBadge(Modifier.align(Alignment.BottomEnd))
                        }
                    }
                    // The keyboard takes the nav bar's row instead of squeezing in above it -
                    // nothing on the nav bar is useful mid-type, and the screen is too small to
                    // show both.
                    val keyboardVisible by CarKeyboardVisibility.state
                    if (!keyboardVisible) CarNavBar(navigator)
                }
                // Over everything, nav bar included: a long press on an app, anywhere.
                AppMenu(navigator, rememberRunningApps())
                if (safetyWarningSeen) CarWhatsNew()
                }
            }
        }
    }
 }
 /**
 * A single blocking screen, shown once per install before anything else the car screen can show -
 * Home included. The phone's own setup guide carries the same warning, but a driver who plugs in
 * without ever opening the phone app would otherwise never see it, on the one screen they are
 * actually about to use while driving. [onDone] fires once, from its own button; there is no way
 * to skip past this without tapping it.
 */
@Composable
 private fun CarSafetyWizard(onDone: () -> Unit) {
    Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
        Column(
            Modifier.fillMaxWidth().padding(24.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            Surface(
                color = MaterialTheme.colorScheme.surfaceContainerLow,
                shape = MaterialTheme.shapes.extraLarge,
            ) {
                Column(Modifier.padding(24.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
                    Text("Drive safely", style = ChromeType.headline, fontWeight = FontWeight.Bold)
                    Text(
                        "Gearslip is unofficial software: it is not made or reviewed by any " +
                            "carmaker, and it can fail without warning.",
                        style = ChromeType.body,
                    )
                    Text(
                        "Never interact with this screen while driving. Set the route or the " +
                            "song before you go, then keep your attention on the road.",
                        style = ChromeType.body,
                    )
                }
            }
            Spacer(Modifier.height(24.dp))
            GsButton(onClick = onDone, modifier = Modifier.fillMaxWidth().height(56.dp)) {
                Text("I understand", style = ChromeType.body)
            }
        }
    }
 }
 /**
 * A templated app that isn't navigation, full size with its own title bar and Stop button - the
 * same [CarAppStage] chrome the map uses on Home, just not embedded there. [CarServices.browse]
 * is a connection of its own, so opening one of these never bumps the map off Home.
 */
@Composable
 private fun BrowseAppScreen(navigator: CarNavigator) {
    val status by CarServices.browse.status.collectAsState()
    val frame by CarEnvironment.frame.collectAsState()
    val template by CarServices.browse.template.collectAsState()
    val leave = {
        CarServices.stopBrowse()
        navigator.back()
    }
    // An app that never answers is as stuck as one that says no; don't leave the driver on "Loading".
    var timedOut by remember { mutableStateOf(false) }
    LaunchedEffect(template == null) {
        timedOut = false
        if (template == null) {
            delay(APP_START_TIMEOUT_MS)
            timedOut = true
        }
    }
    val failed = status.phase == CarAppConnection.Phase.REJECTED || status.phase == CarAppConnection.Phase.FAILED
    if (failed || timedOut) {
        AppWontStart(status.app ?: "This app", leave)
        return
    }
    CarAppStage(CarServices.browse, status, frame, onDisconnect = leave)
 }
 private const val APP_START_TIMEOUT_MS = 15_000L
 /** What a car app that won't run under Gearslip gets instead of a loading screen that never ends. */
@Composable
 private fun AppWontStart(app: String, onBack: () -> Unit) {
    Column(
        Modifier.fillMaxSize().padding(24.dp),
        verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Text("$app doesn't work with Gearslip yet.", style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.SemiBold)
        Text(
            "It didn't start. Some apps only run on Google's Android Auto.",
            style = MaterialTheme.typography.bodyLarge,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
        GsButton(onClick = onBack, tone = GsTone.Tonal) { Text("Back") }
    }
 }
 /**
 * Marks a debug build on the car screen itself, not just the phone's Home screen - the one
 * that matters while driving, since a debug build is slower and less tested than what ships.
 */
@Composable
 private fun DevBuildBadge(modifier: Modifier = Modifier) {
    Surface(
        modifier = modifier.padding(6.dp),
        color = MaterialTheme.colorScheme.error,
        contentColor = MaterialTheme.colorScheme.onError,
        shape = MaterialTheme.shapes.small,
    ) {
        Text(
            "DEV BUILD",
            style = MaterialTheme.typography.labelSmall,
            fontWeight = FontWeight.Bold,
            modifier = Modifier.padding(horizontal = 8.dp, vertical = 3.dp),
        )
    }
 }
 /**
 * "Home > Apps > Settings", like a file manager's address bar: hidden at Home itself (nothing to
 * show yet), and grows by one crumb for every screen pushed from there. The back arrow undoes one
 * step; a crumb jumps straight to it, dropping everything after - this is the only on-screen way
 * back at all, since a car touchscreen has no hardware button for it.
 */
@Composable
 private fun BreadcrumbBar(navigator: CarNavigator) {
    val trail = navigator.trail
    if (trail.size <= 1) return
    Row(
        Modifier.fillMaxWidth().height(40.dp).padding(start = 2.dp, end = 10.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", navigator::back, size = 32.dp, iconSize = 20.dp)
        Spacer(Modifier.width(2.dp))
        trail.forEachIndexed { index, crumb ->
            val isLast = index == trail.lastIndex
            Text(
                crumb.label,
                style = MaterialTheme.typography.labelLarge,
                fontWeight = if (isLast) FontWeight.SemiBold else FontWeight.Normal,
                color = if (isLast) MaterialTheme.colorScheme.onSurface else MaterialTheme.colorScheme.onSurfaceVariant,
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
                modifier = if (isLast) Modifier else Modifier
                    .clip(RoundedCornerShape(6.dp))
                    .clickable { navigator.jumpTo(index) }
                    .padding(horizontal = 4.dp, vertical = 2.dp),
            )
            if (!isLast) {
                Text(
                    "›",
                    style = MaterialTheme.typography.labelLarge,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    modifier = Modifier.padding(horizontal = 2.dp),
                )
            }
        }
    }
 }
 /**
 * Apps and open/pinned shortcuts on the left; now-playing pill against them; clock (tap for
 * calendar and weather), phone battery and the darkness signal on the right. Icon-only: a driver
 * reads a glyph faster than a label, and it keeps the bar short enough to leave the app underneath
 * more room.
 */
@Composable
 private fun CarNavBar(navigator: CarNavigator) {
    val battery by CarEnvironment.battery.collectAsState()
    val now by rememberNow()
    val weather by Weather.state.collectAsState()
    val weatherData = (weather as? WeatherState.Ready)?.data
    val pinnedIds by CarSettings.pinnedApps.collectAsState()
    val entries = rememberAllEntries()
    val pinnedEntries = remember(entries, pinnedIds) {
        pinnedIds.mapNotNull { id -> entries.find { it.componentId == id } }
    }
    val frame by CarEnvironment.frame.collectAsState()
    val running = rememberRunningApps()
    Surface(color = MaterialTheme.colorScheme.surfaceContainer) {
        BoxWithConstraints(Modifier.fillMaxWidth().height(56.dp).padding(horizontal = 10.dp)) {
            Row(Modifier.fillMaxSize(), verticalAlignment = Alignment.CenterVertically) {
                // Home and Apps are two different places now, not a toggle on one button - the
                // breadcrumb trail is how you retrace your steps, but reaching for either of
                // these two from three screens deep in a media app shouldn't mean reading it
                // first.
                NavHomeButton(navigator, entries, running)
                Spacer(Modifier.width(6.dp))
                NavItem(MediaIcons.Apps, navigator.current == CarScreen.Apps) { navigator.apps() }
                val experimentalFeatures by CarSettings.experimentalFeaturesEnabled.collectAsState()
                val voiceEnabled by CarSettings.voiceAssistantEnabled.collectAsState()
                if (experimentalFeatures && voiceEnabled) {
                    Spacer(Modifier.width(6.dp))
                    NavAssistantIcon()
                }
                // Pinned shortcuts, then whatever else is open right now. A pinned app that's also
                // open stays in its pinned spot, marked with a dot, instead of showing up twice.
                // The map app lives on the Home button, so it never gets a second icon here.
                val runningEntries = running.keys
                    .filter { it !in pinnedIds && running[it] != RunningSlot.NAV }
                    .mapNotNull { id -> entries.find { it.componentId == id } }
                val shownPins = pinnedEntries.filter { running[it.componentId] != RunningSlot.NAV }
                if (shownPins.isNotEmpty() || runningEntries.isNotEmpty()) NavDivider()
                shownPins.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
                if (shownPins.isNotEmpty() && runningEntries.isNotEmpty()) NavDivider()
                runningEntries.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
                // Next turn first, off the map only; the player shares the space when it fits,
                // and gives way to the turn when it doesn't.
                val turn = rememberNextTurn().takeIf { navigator.current != CarScreen.Home }
                BoxWithConstraints(Modifier.weight(1f).padding(horizontal = 16.dp), contentAlignment = Alignment.Center) {
                    val roomForBoth = maxWidth >= TURN_AND_PLAYER_MIN_WIDTH
                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(10.dp)) {
                        turn?.let { NavTurnPill(it) { navigator.home() } }
                        if (turn == null || roomForBoth) {
                            NavNowPlaying(navigator, selected = navigator.current == CarScreen.Media, modifier = Modifier.weight(1f, fill = false))
                        }
                    }
                }
                // Weather no longer has its own chip - the temperature alone (no icon, no room
                // for one) sits where "Night"/"Day" used to, freeing a whole chip's width for the
                // Home button above.
                // The clock is also the notifications button: the dashboard lists them under the
                // calendar and weather, and a dot here marks anything unread.
                val unread by CarNotifications.unread.collectAsState()
                NavChip(
                    navigator.current == CarScreen.Dashboard || navigator.current is CarScreen.Notifications,
                    { navigator.dashboard() },
                ) {
                    if (unread > 0) {
                        Box(
                            Modifier
                                .align(Alignment.TopEnd)
                                .offset(x = 8.dp, y = (-2).dp)
                                .size(8.dp)
                                .clip(CircleShape)
                                .background(MaterialTheme.colorScheme.primary),
                        )
                    }
                    Column(horizontalAlignment = Alignment.End) {
                        Text(
                            DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(now)),
                            style = MaterialTheme.typography.titleMedium,
                            fontWeight = FontWeight.SemiBold,
                        )
                        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(3.dp)) {
                            if (battery.percent >= 0) {
                                Text(
                                    "${battery.percent}%",
                                    style = MaterialTheme.typography.labelMedium,
                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                                )
                                if (battery.charging) {
                                    ChargingGlyph(Modifier.size(13.dp))
                                }
                            }
                            weatherData?.let { w ->
                                Text(
                                    "  ·  ${w.temp}°",
                                    style = MaterialTheme.typography.labelMedium,
                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                                )
                            }
                        }
                    }
                }
            }
        }
    }
 }
 /**
 * Home: the map, with the player or lyrics beside it. While a map app runs, the button wears that
 * app's icon and a long press offers to close it, so the app needs no icon of its own on the bar.
 */
@Composable
 private fun NavHomeButton(navigator: CarNavigator, entries: List<Entry>, running: Map<String, RunningSlot>) {
    val selected = navigator.current == CarScreen.Home
    val navId = running.entries.firstOrNull { it.value == RunningSlot.NAV }?.key
    val navEntry = navId?.let { id -> entries.find { it.componentId == id } }
    GsIconBox(
        { navigator.home() },
        colors = navColors(selected),
        latched = selected,
        onLongClick = navId?.let { id -> { navigator.showAppMenu(id) } },
    ) {
        val icon = navEntry?.icon
        if (icon != null) {
            Box(Modifier.padding(NAV_ITEM_PADDING).size(28.dp), contentAlignment = Alignment.Center) {
                Image(icon, navEntry.label, Modifier.size(28.dp).clip(RoundedCornerShape(7.dp)))
            }
        } else {
            Icon(
                ImageVector.vectorResource(R.drawable.navigation_24), contentDescription = "Home",
                modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp),
            )
        }
    }
 }
 /** Splits the nav bar's sections: Home and Apps, pinned apps, open apps. */
@Composable
 private fun NavDivider() {
    Box(
        Modifier
            .padding(horizontal = 10.dp)
            .width(1.dp)
            .height(28.dp)
            .background(MaterialTheme.colorScheme.outlineVariant),
    )
 }
 /**
 * A pinned or open app on the nav bar. Tapping brings it back without reconnecting if it's
 * already open; a long press opens its menu (pin, unpin, close).
 */
@Composable
 private fun NavEntryIcon(
    entry: Entry,
    running: Map<String, RunningSlot>,
    navigator: CarNavigator,
    frame: CarEnvironment.Frame,
 ) {
    val id = entry.componentId ?: return
    val slot = running[id]
    Box(Modifier.padding(horizontal = 3.dp)) {
        NavAppIcon(
            entry,
            open = slot != null,
            showing = slot != null && slot.isShowing(navigator.current),
            onLongClick = { navigator.showAppMenu(id) },
        ) { openApp(entry, slot, navigator, frame) }
    }
 }
 /** One open or pinned app's icon on the nav bar - the same fixed size and shape either way. */
@Composable
 private fun NavAppIcon(
    entry: Entry,
    open: Boolean,
    showing: Boolean,
    onLongClick: () -> Unit,
    onClick: () -> Unit,
 ) {
    val scheme = MaterialTheme.colorScheme
    GsIconBox(
        onClick,
        Modifier.size(44.dp),
        colors = if (showing) GsColors(scheme.secondaryContainer, scheme.onSecondaryContainer)
        else GsColors(scheme.surfaceVariant, scheme.onSurfaceVariant),
        latched = showing,
        onLongClick = onLongClick,
    ) {
        entry.icon?.let { Image(it, entry.label, Modifier.size(30.dp).clip(RoundedCornerShape(8.dp))) }
        entry.builtIn?.let { Icon(it.glyph, entry.label, Modifier.size(26.dp)) }
        // Only running apps get the line along the bottom edge, the usual taskbar mark for it.
        if (open) {
            Box(
                Modifier
                    .align(Alignment.BottomCenter)
                    .padding(bottom = 2.dp)
                    .size(width = 12.dp, height = 3.dp)
                    .clip(RoundedCornerShape(50))
                    .background(scheme.primary),
            )
        }
    }
 }
 /** A tappable group in the bar that stays highlighted while its screen is open, like [NavItem]. */
@Composable
 private fun NavChip(selected: Boolean, onClick: () -> Unit, content: @Composable BoxScope.() -> Unit) {
    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
        Box(Modifier.padding(horizontal = 10.dp, vertical = 2.dp)) { content() }
    }
 }
 /** Every nav bar item is raised, so it reads as pressable; the current screen's takes the accent colour. */
@Composable
 private fun navColors(selected: Boolean): GsColors {
    val s = MaterialTheme.colorScheme
    return if (selected) GsColors(s.secondaryContainer, s.onSecondaryContainer)
    else GsColors(s.surfaceContainerHighest, s.onSurface)
 }
 /**
 * Between Apps and whatever's actually open, not with the clock/battery group on the right - a
 * driver reaches for it right after deciding "not a tap for this", same gesture family as the
 * two buttons beside it.
 */
@Composable
 private fun NavAssistantIcon() {
    val state by CarAssistant.state.collectAsState()
    val active = state.phase != CarAssistant.Phase.IDLE
    GsIconBox({ CarAssistant.start() }, colors = navColors(active), latched = active) {
        MicGlyph(Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
    }
 }
 /** Inner padding of every icon on the nav bar, leaving each button room inside the 56dp bar. */
 private val NAV_ITEM_PADDING = 8.dp
@Composable
 private fun NavItem(icon: ImageVector, selected: Boolean, onClick: () -> Unit) {
    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
        Icon(icon, contentDescription = null, modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
    }
 }
 /** Wall-clock time, ticking on the minute: no reason to redraw (and re-encode) more often. */
@Composable
 internal fun rememberNow(): State<Long> = produceState(System.currentTimeMillis()) {
    while (true) {
        value = System.currentTimeMillis()
        delay(60_000 - value % 60_000)
    }
 }
 /** How long the pill shows a new song's title before settling to just the controls. */
 private const val TITLE_SHOWN_MS = 3_000L
 /** Below this, the nav bar's middle only has room for the turn, not the player beside it. */
 private val TURN_AND_PLAYER_MIN_WIDTH = 520.dp
 /** The next manoeuvre, as the running nav app last described it. */
 private class NextTurn(val icon: CarIcon?, val distance: String, val road: String)
 /**
 * Read straight off the nav app's own template: a navigation app keeps sending its routing card
 * while it's running, whether or not the map is the screen being shown.
 */
@Composable
 private fun rememberNextTurn(): NextTurn? {
    val status by CarServices.nav.status.collectAsState()
    val template by CarServices.nav.template.collectAsState()
    // Read so a change of units redraws the distance straight away, not at the next update.
    CarSettings.units.collectAsState().value
    if (status.phase != CarAppConnection.Phase.RUNNING) return null
    val routing = (template as? NavigationTemplate)?.navigationInfo as? RoutingInfo ?: return null
    if (routing.isLoading) return null
    val step = routing.currentStep ?: return null
    return NextTurn(
        icon = step.maneuver?.icon,
        distance = routing.currentDistance.display(),
        road = step.road.text().ifEmpty { step.cue.text() },
    )
 }
 /** The next turn in the nav bar: arrow, how far, onto what. Tapping goes back to the map. */
@Composable
 private fun NavTurnPill(turn: NextTurn, onClick: () -> Unit) {
    // Same finish as every other button on the bar, in the accent colour; the text runs a step
    // bigger than anything else there, since it's the one thing worth a glance mid-drive.
    GsIconBox(
        onClick,
        Modifier.widthIn(max = 340.dp).height(44.dp),
        colors = gsColors(GsTone.Primary),
    ) {
        Row(
            Modifier.padding(NAV_ITEM_PADDING),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(8.dp),
        ) {
            CarGlyph(turn.icon, Modifier.size(28.dp))
            if (turn.distance.isNotEmpty()) {
                Text(turn.distance, style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold, maxLines = 1)
            }
            if (turn.road.isNotEmpty()) {
                Text(
                    turn.road,
                    style = MaterialTheme.typography.titleMedium,
                    fontWeight = FontWeight.SemiBold,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                )
            }
        }
    }
 }
 /** "Title - Artist" on one line. The text itself cuts it off, and only where the pill runs out of room. */
 private fun nowPlayingLabel(title: String, artist: String): String =
    listOf(title.trim(), artist.trim()).filter { it.isNotEmpty() }.joinToString(" - ")
        .ifEmpty { "Nothing playing" }
 /**
 * The player in the nav bar, on every screen. Art and title open the full media screen;
 * play/pause and skip work right here. The dock button moves the player into the column beside
 * the map on Home (see [CarHome]), and the pill steps aside there while it's docked - unless the
 * column is showing lyrics instead, when the pill stays and its dock button swaps them back.
 */
@Composable
 private fun NavNowPlaying(navigator: CarNavigator, selected: Boolean, modifier: Modifier = Modifier) {
    val media = CarServices.media
    val phase by media.phase.collectAsState()
    val now by media.now.collectAsState()
    if (phase != CarMedia.Phase.READY || !now.isActive) return
    // Docked beside the map, the player is already on screen - the pill steps aside for it.
    if (navigator.sidePanel == SidePanel.CONTROLS && navigator.current == CarScreen.Home) return
    // The media screen is the full player already; the pill would only repeat its controls.
    if (navigator.current == CarScreen.Media) return
    val context = LocalContext.current
    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
    val position by produceState(now.currentPosition(), now) {
        while (true) {
            value = now.currentPosition()
            if (!now.playing) break
            delay(1000)
        }
    }
    // A new song announces itself: title, play/pause and dock for a few seconds, then the title
    // goes and the pill settles to just the controls - unless the driver keeps the title up.
    val keepTitle by CarSettings.playerTitle.collectAsState()
    var announcing by remember { mutableStateOf(true) }
    LaunchedEffect(now.title, now.artist) {
        announcing = true
        delay(TITLE_SHOWN_MS)
        announcing = false
    }
    val showTitle = keepTitle || announcing
    val scheme = MaterialTheme.colorScheme
    val onPill = if (selected) scheme.onPrimaryContainer else scheme.onSecondaryContainer
    Surface(
        modifier = modifier
            .animateContentSize()
            // With the title up, all the room the bar has, so as much of it shows as can.
            .then(if (showTitle) Modifier.fillMaxWidth() else Modifier)
            .height(44.dp),
        shape = RoundedCornerShape(14.dp),
        color = if (selected) scheme.primaryContainer else scheme.secondaryContainer,
        contentColor = onPill,
    ) {
        Box {
            Row(
                Modifier.fillMaxHeight().padding(horizontal = 4.dp),
                verticalAlignment = Alignment.CenterVertically,
                horizontalArrangement = Arrangement.spacedBy(6.dp),
            ) {
                // Art (and the title while it shows) opens the full media screen.
                Row(
                    Modifier
                        .then(if (showTitle) Modifier.weight(1f) else Modifier)
                        .fillMaxHeight()
                        .clip(RoundedCornerShape(10.dp))
                        .clickable { navigator.media() },
                    verticalAlignment = Alignment.CenterVertically,
                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                ) {
                    Box(Modifier.size(34.dp).clip(RoundedCornerShape(8.dp)).background(scheme.surfaceVariant)) {
                        art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
                    }
                    if (showTitle) {
                        Text(
                            nowPlayingLabel(now.title, now.artist),
                            style = MaterialTheme.typography.titleSmall,
                            fontWeight = FontWeight.SemiBold,
                            maxLines = 1,
                            overflow = TextOverflow.Ellipsis,
                        )
                    }
                }
                if (!showTitle) {
                    GsIconButton(
                        MediaIcons.Previous, "Previous", media::previous,
                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_PREVIOUS), size = 36.dp, iconSize = 22.dp,
                    )
                }
                GsIconButton(
                    if (now.playing) MediaIcons.Pause else Icons.Filled.PlayArrow,
                    if (now.playing) "Pause" else "Play",
                    media::togglePlay,
                    tone = GsTone.Primary, size = 36.dp, iconSize = 22.dp,
                )
                if (!showTitle) {
                    GsIconButton(
                        MediaIcons.Next, "Next", media::next,
                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_NEXT), size = 36.dp, iconSize = 22.dp,
                    )
                }
                GsIconButton(
                    MediaIcons.DockRight, "Move the player beside the map", navigator::togglePlayerDock,
                    size = 36.dp, iconSize = 22.dp,
                )
            }
            if (now.durationMs > 0) {
                // matchParentSize, so the line follows the pill's width rather than widening it.
                Box(Modifier.matchParentSize(), contentAlignment = Alignment.BottomStart) {
                    Box(
                        Modifier
                            .fillMaxWidth((position.toFloat() / now.durationMs).coerceIn(0f, 1f))
                            .height(2.dp)
                            .background(onPill.copy(alpha = 0.7f)),
                    )
                }
            }
        }
    }
 }
 /**
 * A filled lightning bolt, next to the battery percentage instead of the word "charging" - the
 * core Material icon set this project ships (no extended pack, to keep the app small) has no
 * bolt, so this is drawn rather than a vector asset.
 */
@Composable
 private fun ChargingGlyph(modifier: Modifier = Modifier, tint: Color = MaterialTheme.colorScheme.onSurfaceVariant) {
    androidx.compose.foundation.Canvas(modifier) {
        val w = size.width
        val h = size.height
        val bolt = androidx.compose.ui.graphics.Path().apply {
            moveTo(w * 0.58f, 0f)
            lineTo(w * 0.12f, h * 0.58f)
            lineTo(w * 0.46f, h * 0.58f)
            lineTo(w * 0.42f, h)
            lineTo(w * 0.88f, h * 0.40f)
            lineTo(w * 0.54f, h * 0.40f)
            close()
        }
        drawPath(bolt, tint)
    }
 }
@@ -0,0 +1,113 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.produceState
 import kotlinx.coroutines.delay
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.Changelog
 import app.seb3thehacker.gearslip.car.theme.GsButton
 import app.seb3thehacker.gearslip.car.theme.GsSwitch
 import app.seb3thehacker.gearslip.notify.CarMotion
 /**
 * What's new in this build, once, the first time the car screen shows after an update - or any
 * time from Settings > About. Held back while the car is moving: a list to read is for when
 * parked. The switch turns the automatic showing off (or back on); it doesn't close the card.
 */
@Composable
 fun CarWhatsNew() {
    val release = Changelog.current ?: return
    val afterUpdates by CarSettings.whatsNewAfterUpdates.collectAsState()
    val seen by CarSettings.whatsNewSeen.collectAsState()
    val open by CarSettings.whatsNewOpen.collectAsState()
    // Polled: CarMotion is a plain value, and the card should appear once the car stops.
    val moving by produceState(CarMotion.moving) {
        while (true) {
            value = CarMotion.moving
            delay(5_000)
        }
    }
    val due = afterUpdates && seen < release.versionCode && !moving
    if (!open && !due) return
    val close = { CarSettings.closeWhatsNew(release.versionCode) }
    Box(
        Modifier
            .fillMaxSize()
            .background(Color.Black.copy(alpha = 0.5f))
            .clickable(remember { MutableInteractionSource() }, indication = null, onClick = close),
        contentAlignment = Alignment.Center,
    ) {
        Surface(
            shape = RoundedCornerShape(24.dp),
            color = MaterialTheme.colorScheme.surfaceContainerHigh,
            // Swallows taps on the card itself, so only the scrim around it closes.
            modifier = Modifier
                .padding(16.dp)
                .widthIn(max = 640.dp)
                .clickable(remember { MutableInteractionSource() }, indication = null) {},
        ) {
            Column(Modifier.padding(20.dp), verticalArrangement = Arrangement.spacedBy(14.dp)) {
                Text(
                    "What's new in ${release.versionName}",
                    style = MaterialTheme.typography.headlineSmall,
                    fontWeight = FontWeight.Bold,
                )
                Column(
                    Modifier.weight(1f, fill = false).verticalScroll(rememberScrollState()),
                    verticalArrangement = Arrangement.spacedBy(10.dp),
                ) {
                    release.changes.forEach { change ->
                        Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
                            Box(
                                Modifier
                                    .padding(top = 9.dp)
                                    .size(7.dp)
                                    .background(MaterialTheme.colorScheme.primary, CircleShape),
                            )
                            Text(change, style = MaterialTheme.typography.bodyLarge)
                        }
                    }
                }
                Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(14.dp)) {
                    GsSwitch(afterUpdates, CarSettings::setWhatsNewAfterUpdates)
                    Text(
                        "Show after updates",
                        style = MaterialTheme.typography.titleMedium,
                        modifier = Modifier.weight(1f),
                    )
                    GsButton(onClick = close, modifier = Modifier.height(56.dp)) {
                        Text("Got it", style = MaterialTheme.typography.titleMedium)
                    }
                }
            }
        }
    }
 }
@@ -0,0 +1,38 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.staticCompositionLocalOf
 import android.os.SystemClock
 /**
 * Whether the map's buttons (settings, pan, zoom, locate) are showing.
 *
 * They fade out after [IDLE_MS] with no touch anywhere on the car screen, to leave the map clear,
 * and any touch brings them back. [touch] is called for every pointer event and is cheap: it only
 * writes state when the buttons were actually hidden.
 */
 class MapControlsWake {
    var awake by mutableStateOf(true)
        private set
    private var lastTouch = SystemClock.uptimeMillis()
    fun touch() {
        lastTouch = SystemClock.uptimeMillis()
        if (!awake) awake = true
    }
    /** Called on a timer; hides the buttons once nothing has touched the screen for [IDLE_MS]. */
    fun tick() {
        if (awake && SystemClock.uptimeMillis() - lastTouch >= IDLE_MS) awake = false
    }
    companion object {
        const val IDLE_MS = 4_000L
    }
 }
 val LocalMapControlsWake = staticCompositionLocalOf { MapControlsWake() }
@@ -0,0 +1,539 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.foundation.layout.Arrangement
 import android.provider.Settings
 import android.content.Intent
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.PathFillType
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.graphics.vector.addPathNodes
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import app.seb3thehacker.gearslip.audio.CarAudio
 import app.seb3thehacker.gearslip.media.CarMedia
 import app.seb3thehacker.gearslip.media.MediaApp
 import app.seb3thehacker.gearslip.media.MediaArt
 import app.seb3thehacker.gearslip.media.LyricsResult
 import app.seb3thehacker.gearslip.media.Lyrics
 import app.seb3thehacker.gearslip.media.MediaEntry
 import app.seb3thehacker.gearslip.media.NowPlaying
 import app.seb3thehacker.gearslip.media.QueueTrack
 import android.media.session.PlaybackState
 /**
 * A media app on the car screen: what it is playing and its controls on the left, the tree it
 * offers to browse on the right. The app owns the content; this only draws it.
 */
@Composable
 fun MediaScreen(app: MediaApp, onExit: () -> Unit) {
    val context = LocalContext.current
    val media = CarServices.media
    val phase by media.phase.collectAsStateWithLifecycle()
    val now by media.now.collectAsStateWithLifecycle()
    val queue by media.queue.collectAsStateWithLifecycle()
    val browse by media.browse.collectAsStateWithLifecycle()
    val rejection by media.rejection.collectAsStateWithLifecycle()
    val capture by CarAudio.capture.collectAsStateWithLifecycle()
    var tab by remember { mutableStateOf(Tab.NOW_PLAYING) }
    // The connection outlives this screen: the home screen's player is the same one.
    LaunchedEffect(app) { CarServices.openMedia(app) }
    val art = rememberArt(now)
    // The art's colour behind everything, header included; the buttons keep their own.
    Surface(Modifier.fillMaxSize(), color = rememberArtColor(art, MaterialTheme.colorScheme.background, darkLightness = 0.15f, lightLightness = 0.9f)) {
        if (phase != CarMedia.Phase.READY) {
            Column(Modifier.fillMaxSize()) {
                AppIdentity(app, onExit, Modifier.padding(horizontal = 16.dp, vertical = 10.dp))
                when (phase) {
                    CarMedia.Phase.REJECTED -> when (rejection) {
                        CarMedia.Rejection.NEEDS_NOTIFICATION_ACCESS -> Notice(
                            "${app.label} keeps its library to itself.",
                            "Gearslip can still control it once it has Notification access on the phone. " +
                                "Allow it under Settings > Notifications > Notification access.",
                            action = "Open on phone" to {
                                val app = context.applicationContext
                                runCatching {
                                    app.startActivity(
                                        Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
                                    )
                                }
                            },
                        )
                        CarMedia.Rejection.NEEDS_APP_RUNNING -> Notice(
                            "${app.label} isn't running.",
                            "${app.label} plays through Gearslip's own player, but only while it's " +
                                "open on the phone. Open it once and it keeps playing here in the car.",
                            action = "Open ${app.label}" to { media.launchAndConnect(app) },
                        )
                        CarMedia.Rejection.REFUSED -> Notice(
                            "${app.label} would not let Gearslip browse it.",
                            "Some media apps only accept Google's own host.",
                        )
                    }
                    else -> Notice("Connecting to ${app.label}…", null)
                }
            }
            return@Surface
        }
        // Two columns, split the same way on every tab so nothing jumps when switching: the app
        // and the art (or, beside a list, the compact player) on the left; the tabs across the
        // top of the right column, over whatever the tab shows.
        Row(
            Modifier.fillMaxSize().padding(start = 16.dp, end = 16.dp, top = 10.dp, bottom = 8.dp),
            horizontalArrangement = Arrangement.spacedBy(24.dp),
        ) {
            Column(Modifier.weight(0.8f).fillMaxHeight()) {
                AppIdentity(app, onExit)
                Spacer(Modifier.height(12.dp))
                if (tab == Tab.NOW_PLAYING) {
                    CoverArt(art, Modifier.weight(1f).fillMaxWidth())
                } else {
                    CompactPlayer(now, media, Modifier.weight(1f).fillMaxWidth())
                }
                AudioBadge(capture)
            }
            Column(Modifier.weight(1.2f).fillMaxHeight()) {
                Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                    MediaTab("Now playing", tab == Tab.NOW_PLAYING, Modifier.weight(1f)) { tab = Tab.NOW_PLAYING }
                    MediaTab("Browse", tab == Tab.BROWSE, Modifier.weight(1f)) { tab = Tab.BROWSE }
                    MediaTab("Up next", tab == Tab.QUEUE, Modifier.weight(1f)) { tab = Tab.QUEUE }
                    MediaTab("Lyrics", tab == Tab.LYRICS, Modifier.weight(1f)) { tab = Tab.LYRICS }
                }
                Spacer(Modifier.height(12.dp))
                Box(Modifier.weight(1f).fillMaxWidth()) {
                    when (tab) {
                        Tab.NOW_PLAYING -> NowPlayingControls(now, media, Modifier.fillMaxSize())
                        Tab.BROWSE -> BrowsePanel(browse, media, app.label, Modifier.fillMaxSize())
                        Tab.QUEUE -> QueuePanel(queue, now, media, Modifier.fillMaxSize())
                        Tab.LYRICS -> LyricsPanel(now, Modifier.fillMaxSize())
                    }
                }
            }
        }
    }
 }
 /**
 * Back, then which app this is: its own icon and its name, quieter than the song title - the
 * name alone in big bold type read as one more heading fighting the track for attention.
 */
@Composable
 private fun AppIdentity(app: MediaApp, onExit: () -> Unit, modifier: Modifier = Modifier) {
    val icon = remember(app) { findEntry(app.component.flattenToString())?.icon }
    Row(modifier, verticalAlignment = Alignment.CenterVertically) {
        GsIconButton(Icons.Filled.ArrowBack, "Back", onExit, size = 44.dp)
        Spacer(Modifier.width(14.dp))
        icon?.let {
            Image(it, null, Modifier.size(26.dp).clip(RoundedCornerShape(7.dp)))
            Spacer(Modifier.width(10.dp))
        }
        Text(
            app.label.lowercase().replaceFirstChar { it.titlecase() },
            style = MaterialTheme.typography.titleMedium,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
    }
 }
 private enum class Tab { NOW_PLAYING, BROWSE, QUEUE, LYRICS }
 /** A bigger, easier-to-hit tab than a plain [TextButton] - this row is the only navigation on the screen. */
@Composable
 private fun MediaTab(label: String, selected: Boolean, modifier: Modifier, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(44.dp),
        colors = if (selected) GsColors(MaterialTheme.colorScheme.primaryContainer, MaterialTheme.colorScheme.onPrimaryContainer)
        else GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
        shape = MaterialTheme.shapes.large,
        latched = selected,
    ) {
        Text(
            label,
            style = MaterialTheme.typography.titleSmall,
            fontWeight = if (selected) FontWeight.Bold else FontWeight.Normal,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
    }
 }
 /**
 * The song's lyrics, fetched when this tab opens. Synced lyrics follow the playback position with
 * the current line in the accent colour; unsynced ones are plain scrolling text.
 */
@Composable
 internal fun LyricsPanel(
    now: NowPlaying,
    modifier: Modifier,
    lineStyle: androidx.compose.ui.text.TextStyle = MaterialTheme.typography.titleLarge,
 ) {
    val context = LocalContext.current
    val lyrics by produceState<LyricsState>(LyricsState.Loading, now.title, now.artist, now.album, now.durationMs) {
        value = LyricsState.Loading
        value = Lyrics.find(context, now.title, now.artist, now.album, now.durationMs)
            ?.let { LyricsState.Found(it) } ?: LyricsState.Missing
    }
    val list = rememberLazyListState()
    // Ticks with playback so the highlighted line moves; only synced lyrics need it.
    var position by remember { mutableLongStateOf(0L) }
    LaunchedEffect(now) {
        while (true) {
            position = now.currentPosition()
            kotlinx.coroutines.delay(300)
        }
    }
    when (val state = lyrics) {
        LyricsState.Loading -> Notice("Looking for lyrics…", null)
        LyricsState.Missing -> Notice(
            if (now.title.isEmpty()) "Nothing playing." else "No lyrics found for this track.",
            null,
        )
        is LyricsState.Found -> {
            val lines = state.result.lines
            val current = if (state.result.synced) lines.indexOfLast { it.timeMs <= position } else -1
            LaunchedEffect(current) {
                if (current >= 0) list.animateScrollToItem((current - 1).coerceAtLeast(0))
            }
            LazyColumn(modifier, state = list, verticalArrangement = Arrangement.spacedBy(6.dp)) {
                itemsIndexed(lines) { index, line ->
                    Text(
                        line.text.ifEmpty { " " },
                        style = lineStyle,
                        fontWeight = if (index == current) FontWeight.Bold else FontWeight.Normal,
                        color = when {
                            !state.result.synced -> MaterialTheme.colorScheme.onSurface
                            index == current -> MaterialTheme.colorScheme.primary
                            else -> MaterialTheme.colorScheme.onSurfaceVariant
                        },
                    )
                }
            }
        }
    }
 }
 private sealed interface LyricsState {
    data object Loading : LyricsState
    data object Missing : LyricsState
    class Found(val result: LyricsResult) : LyricsState
 }
@Composable
 private fun AudioBadge(capture: CarAudio.Capture) {
    val text = when (capture) {
        CarAudio.Capture.ON -> "Audio to car"
        CarAudio.Capture.ASKING -> "Allow audio capture on the phone"
        CarAudio.Capture.DENIED -> "Audio stays on the phone"
        CarAudio.Capture.OFF -> return
    }
    Text(text, style = MaterialTheme.typography.labelLarge, color = MaterialTheme.colorScheme.onSurfaceVariant)
 }
@Composable
 private fun Notice(title: String, detail: String?, action: Pair<String, () -> Unit>? = null) {
    Column(
        Modifier.fillMaxSize().padding(horizontal = 24.dp),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Text(title, style = MaterialTheme.typography.titleMedium, textAlign = androidx.compose.ui.text.style.TextAlign.Center)
        detail?.let {
            Text(
                it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
                textAlign = androidx.compose.ui.text.style.TextAlign.Center,
            )
        }
        action?.let { (label, run) ->
            Spacer(Modifier.height(12.dp))
            GsButton(onClick = run, tone = GsTone.Tonal) { Text(label) }
        }
    }
 }
 // --- now playing -----------------------------------------------------------------------------
 /**
 * The now-playing view on its own, for places with no tabs around it (an app's own
 * now-playing template): the cover on the left, [NowPlayingControls] on the right.
 */
@Composable
 internal fun NowPlayingPage(now: NowPlaying, media: CarMedia, modifier: Modifier) {
    Row(
        modifier.padding(horizontal = 24.dp, vertical = 8.dp),
        horizontalArrangement = Arrangement.spacedBy(24.dp),
    ) {
        CoverArt(rememberArt(now), Modifier.weight(0.8f).fillMaxHeight())
        NowPlayingControls(now, media, Modifier.weight(1.2f).fillMaxHeight())
    }
 }
 /** The cover, as big a square as its space allows, centred in it. */
@Composable
 private fun CoverArt(art: android.graphics.Bitmap?, modifier: Modifier) {
    BoxWithConstraints(modifier, contentAlignment = Alignment.Center) {
        Surface(
            shape = MaterialTheme.shapes.large,
            color = MaterialTheme.colorScheme.surfaceVariant,
            shadowElevation = 6.dp,
            modifier = Modifier.size(minOf(maxWidth, maxHeight)),
        ) {
            art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
        }
    }
 }
 /**
 * Everything about the track and every control for it, read top to bottom: title and artist,
 * the seek bar, the transport, then like, shuffle and repeat as big icon-only buttons.
 */
@Composable
 private fun NowPlayingControls(now: NowPlaying, media: CarMedia, modifier: Modifier) {
    Column(
        modifier.verticalScroll(rememberScrollState()),
        verticalArrangement = Arrangement.spacedBy(14.dp, Alignment.CenterVertically),
    ) {
        Column {
            Text(
                now.title.ifEmpty { "Nothing playing" },
                style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold,
                maxLines = 2, overflow = TextOverflow.Ellipsis,
            )
            Text(
                listOf(now.artist, now.album).filter { it.isNotEmpty() }.joinToString(" - "),
                style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
                maxLines = 1, overflow = TextOverflow.Ellipsis,
            )
            now.error?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.error, maxLines = 2) }
        }
        PlayerProgress(now, media, Modifier.fillMaxWidth())
        TransportRow(now, media, skip = 60.dp, modifier = Modifier.fillMaxWidth())
        PlayModeRow(now, media, size = 56.dp, modifier = Modifier.fillMaxWidth(), maxOther = 2)
    }
 }
 /**
 * The player beside the browse list, the queue and the lyrics: no art, which the list needs the
 * room for, just what's playing, the seek bar and the controls.
 */
@Composable
 private fun CompactPlayer(now: NowPlaying, media: CarMedia, modifier: Modifier) {
    Column(
        modifier.verticalScroll(rememberScrollState()),
        verticalArrangement = Arrangement.spacedBy(14.dp),
    ) {
        Column {
            Text(
                now.title.ifEmpty { "Nothing playing" },
                style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold,
                maxLines = 2, overflow = TextOverflow.Ellipsis,
            )
            Text(
                now.artist,
                style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.onSurfaceVariant,
                maxLines = 1, overflow = TextOverflow.Ellipsis,
            )
        }
        PlayerProgress(now, media, Modifier.fillMaxWidth())
        TransportRow(now, media, skip = 52.dp, modifier = Modifier.fillMaxWidth())
        PlayModeRow(now, media, size = 48.dp, modifier = Modifier.fillMaxWidth())
    }
 }
 // --- browsing --------------------------------------------------------------------------------
@Composable
 private fun BrowsePanel(browse: app.seb3thehacker.gearslip.media.BrowseState, media: CarMedia, appLabel: String, modifier: Modifier) {
    Column(modifier) {
        // At the library root there's no trail and nowhere to go up to, so there's nothing this
        // row could say that the app's name in the top-left corner hasn't already - showing it
        // again here (as "Browse", or as the app's own name) was just the same label twice.
        if (media.canGoUp || browse.trail.isNotEmpty()) {
            Row(verticalAlignment = Alignment.CenterVertically) {
                if (media.canGoUp) {
                    GsIconButton(Icons.Filled.ArrowBack, "Up", media::up)
                }
                browse.trail.lastOrNull()?.let {
                    Text(
                        it,
                        style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold,
                        maxLines = 1, overflow = TextOverflow.Ellipsis,
                    )
                }
            }
        }
        when {
            browse.loading -> Notice("Loading…", null)
            browse.unavailable -> Notice(
                "$appLabel keeps its library to itself.",
                "Start music in the app on your phone. Play, pause, skip and seek work from here.",
            )
            browse.failed -> Notice("Could not load this list.", null)
            browse.entries.isEmpty() -> Notice("Nothing here.", null)
            else -> LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                items(browse.entries, key = { it.id }) { entry -> EntryRow(entry, media) }
            }
        }
    }
 }
 // --- up next -----------------------------------------------------------------------------------
 /**
 * Whatever the app has queued up, starting right after the track that's playing now - not the
 * whole queue from the top, which would just repeat what the player beside it already shows. Apps
 * that never publish a queue (many don't) show an empty notice rather than a permanently blank tab.
 */
@Composable
 private fun QueuePanel(queue: List<QueueTrack>, now: NowPlaying, media: CarMedia, modifier: Modifier) {
    val upNext = remember(queue, now.activeQueueItemId) {
        val current = queue.indexOfFirst { it.queueId == now.activeQueueItemId }
        if (current >= 0) queue.drop(current + 1) else queue
    }
    Column(modifier) {
        if (upNext.isEmpty()) {
            Notice(
                "Nothing queued.",
                "${if (now.title.isEmpty()) "Nothing playing" else "Only what's already playing"} - " +
                    "not every app tells Gearslip what comes next.",
            )
        } else {
            LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                items(upNext, key = { it.queueId }) { track -> QueueRow(track, media) }
            }
        }
    }
 }
@Composable
 private fun QueueRow(track: QueueTrack, media: CarMedia) {
    val context = LocalContext.current
    val icon by produceState(track.iconBitmap, track.iconUri) {
        value = track.iconBitmap ?: MediaArt.load(context, track.iconUri)
    }
    Surface(
        onClick = { media.playQueueItem(track) },
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.surfaceVariant,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(Modifier.padding(10.dp), verticalAlignment = Alignment.CenterVertically) {
            Box(Modifier.size(62.dp).clip(MaterialTheme.shapes.medium).background(MaterialTheme.colorScheme.surface)) {
                icon?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
            }
            Column(Modifier.weight(1f).padding(horizontal = 12.dp)) {
                Text(track.title, style = MaterialTheme.typography.titleSmall, maxLines = 1, overflow = TextOverflow.Ellipsis)
                if (track.subtitle.isNotEmpty()) {
                    Text(track.subtitle, style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
                }
            }
            Icon(Icons.Filled.PlayArrow, "Play", tint = MaterialTheme.colorScheme.onSurfaceVariant)
        }
    }
 }
@Composable
 private fun EntryRow(entry: MediaEntry, media: CarMedia) {
    val context = LocalContext.current
    val icon by produceState(entry.iconBitmap, entry.iconUri) {
        value = entry.iconBitmap ?: MediaArt.load(context, entry.iconUri)
    }
    Surface(
        onClick = { media.select(entry) },
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.surfaceVariant,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(Modifier.padding(10.dp), verticalAlignment = Alignment.CenterVertically) {
            Box(Modifier.size(62.dp).clip(MaterialTheme.shapes.medium).background(MaterialTheme.colorScheme.surface)) {
                icon?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
            }
            Column(Modifier.weight(1f).padding(horizontal = 12.dp)) {
                Text(entry.title, style = MaterialTheme.typography.titleSmall, maxLines = 1, overflow = TextOverflow.Ellipsis)
                if (entry.subtitle.isNotEmpty()) {
                    Text(entry.subtitle, style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
                }
            }
            if (entry.browsable && entry.playable) {
                GsIconButton(Icons.Filled.PlayArrow, "Play", { media.playAll(entry) })
            }
            if (entry.browsable) Icon(Icons.AutoMirrored.Filled.KeyboardArrowRight, null)
        }
    }
 }
 /** Material's transport icons, from their published path data (they live in the extended set). */
 internal object MediaIcons {
    val Pause = icon("Pause", "M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z")
    val Next = icon("SkipNext", "M6,18l8.5,-6L6,6v12zM16,6v12h2V6h-2z")
    /** The 3x3 app grid; not in material-icons-core. */
    val Apps = icon("Apps", "M4,8h4L8,4L4,4v4zM10,20h4v-4h-4v4zM4,20h4v-4L4,16v4zM4,14h4v-4L4,10v4zM10,14h4v-4h-4v4zM16,4v4h4L20,4h-4zM10,8h4L14,4h-4v4zM16,14h4v-4h-4v4zM16,20h4v-4h-4v4z")
    val Previous = icon("SkipPrevious", "M6,6h2v12L6,18zM9.5,12l8.5,6V6z")
    val Equalizer = icon("Equalizer", "M10,20h4L14,4h-4v16zM4,20h4v-8L4,12v8zM16,9v11h4L20,9h-4z")
    val Shuffle = icon("Shuffle", "M10.59,9.17L5.41,4 4,5.41l5.17,5.17 1.42,-1.41zM14.5,4l2.04,2.04L4,18.59 5.41,20 17.96,7.46 20,9.5L20,4h-5.5zM14.83,13.41l-1.41,1.41 3.13,3.13L14.5,20L20,20v-5.5l-2.04,2.04 -3.13,-3.13z")
    val Repeat = icon("Repeat", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4z")
    val RepeatOne = icon("RepeatOne", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4zM13,15L13,9h-1l-2,1v1h1.5v4L13,15z")
    /** A screen with a filled right-hand panel: "put the player beside the map". */
    val DockRight = icon("DockRight", "M2,4h20v16H2zM4,6h10v12H4z", PathFillType.EvenOdd)
    private fun icon(name: String, path: String, fillType: PathFillType = PathFillType.NonZero) = ImageVector.Builder(
        name, 24.dp, 24.dp, 24f, 24f,
    ).addPath(addPathNodes(path), pathFillType = fillType, fill = SolidColor(androidx.compose.ui.graphics.Color.Black)).build()
 }
@@ -0,0 +1,274 @@
 package app.seb3thehacker.gearslip.car
 import android.os.SystemClock
 import androidx.compose.foundation.background
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.withFrameMillis
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.GsButton
 import app.seb3thehacker.gearslip.car.theme.GsIconButton
 import app.seb3thehacker.gearslip.car.theme.GsProgressBar
 import app.seb3thehacker.gearslip.car.theme.GsTone
 import app.seb3thehacker.gearslip.notify.CarNotification
 import app.seb3thehacker.gearslip.notify.CarNotifications
 import kotlinx.coroutines.delay
 /*
 * A new message on the car screen: a card at the top right, over the player beside the map on
 * Home, so the road stays in view. It offers two things - hear it, or answer it by voice - and
 * shows [VoiceReply]'s progress once either starts. A bar along its bottom empties as the card
 * runs out of time, whatever it's waiting to do: go away, or send.
 */
 /** How long a new message stays up on its own. */
 private const val POPUP_MS = 5_000L
 /** When [this] popup goes away on its own. */
 private fun CarNotification.until() = shownAt + POPUP_MS
 /**
 * Times the popup out. Each new message in the same chat starts the clock again. A voice reply
 * covers the card while it runs; if the popup's time ran out meanwhile, it goes when the reply ends.
 */
@Composable
 internal fun PopupTimer() {
    val popup by CarNotifications.popup.collectAsState()
    val voice by VoiceReply.state.collectAsState()
    val n = popup ?: return
    val busy = voice.phase != VoiceReply.Phase.IDLE
    LaunchedEffect(n.id, n.shownAt, busy) {
        if (busy) return@LaunchedEffect
        delay((n.until() - SystemClock.uptimeMillis()).coerceAtLeast(0L))
        CarNotifications.dismissPopup(n.id)
    }
 }
@Composable
 internal fun ReadGlyph(modifier: Modifier = Modifier) =
    Icon(ImageVector.vectorResource(R.drawable.volume_up_24), null, modifier)
@Composable
 internal fun ReplyGlyph(modifier: Modifier = Modifier) =
    Icon(ImageVector.vectorResource(R.drawable.voice_selection_24), null, modifier)
 /** "Alex", or "Alex · 3 new" when a burst of messages from one chat has been merged. */
 private fun CarNotification.heading(): String {
    val who = title.ifBlank { appLabel }
    return if (burst > 1) "$who · $burst new" else who
 }
 /** The card. It shows the voice reply too, wherever that was started from. */
@Composable
 fun NotificationPopup(showNew: Boolean, modifier: Modifier = Modifier) {
    val popup by CarNotifications.popup.collectAsState()
    val voice by VoiceReply.state.collectAsState()
    val target = voice.target
    if (voice.phase != VoiceReply.Phase.IDLE && target != null) {
        PopupCard(voice.until, voice.span, modifier, held = voice.held) { VoiceReplyBody(voice, target) }
        return
    }
    val n = popup?.takeIf { showNew } ?: return
    PopupCard(n.until(), POPUP_MS, modifier) {
        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
            NotificationIcon(n, size = 44.dp)
            Column(Modifier.weight(1f)) {
                Text(n.heading(), style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold, maxLines = 1, overflow = TextOverflow.Ellipsis)
                Text(n.text, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
            }
            GsIconButton(Icons.Filled.Close, "Dismiss", { CarNotifications.dismissPopup(n.id) }, size = 40.dp, iconSize = 20.dp)
        }
        Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
            GsButton(onClick = { VoiceReply.read(n) }, tone = GsTone.Neutral, modifier = Modifier.weight(1f)) {
                ReadGlyph(Modifier.size(20.dp))
                Text("Read", Modifier.padding(start = 8.dp))
            }
            if (n.reply != null) {
                GsButton(onClick = { VoiceReply.reply(n) }, modifier = Modifier.weight(1f)) {
                    ReplyGlyph(Modifier.size(20.dp))
                    Text("Reply", Modifier.padding(start = 8.dp))
                }
            }
        }
    }
 }
 /**
 * The card's frame. When [until] is set, a bar along the bottom empties over [span] ms, so the
 * driver sees at a glance how long is left before the card acts. A [held] countdown shows its bar
 * standing still.
 */
@Composable
 private fun PopupCard(until: Long, span: Long, modifier: Modifier, held: Float = 0f, content: @Composable () -> Unit) {
    Surface(
        shape = RoundedCornerShape(20.dp),
        color = MaterialTheme.colorScheme.surfaceContainerHigh,
        contentColor = MaterialTheme.colorScheme.onSurface,
        shadowElevation = 8.dp,
        modifier = modifier.padding(12.dp).widthIn(min = 300.dp, max = 400.dp).fillMaxWidth(0.34f),
    ) {
        Column(Modifier.padding(14.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
            content()
            if (until > 0L && span > 0L) {
                val left by rememberTimeLeft(until, span)
                GsProgressBar(left, Modifier.fillMaxWidth(), height = 14.dp)
            } else if (held > 0f) {
                GsProgressBar(held, Modifier.fillMaxWidth(), height = 14.dp)
            }
        }
    }
 }
 /** The share of [span] still to go before [until], updated every frame so the bar moves smoothly. */
@Composable
 private fun rememberTimeLeft(until: Long, span: Long) = produceState(fractionLeft(until, span), until, span) {
    // The state outlives a change of deadline, so start from the new one rather than the old value.
    value = fractionLeft(until, span)
    while (value > 0f) {
        withFrameMillis { value = fractionLeft(until, span) }
    }
 }
 private fun fractionLeft(until: Long, span: Long): Float =
    ((until - SystemClock.uptimeMillis()).toFloat() / span).coerceIn(0f, 1f)
 /** Each step of a voice reply, with the buttons that fit it. */
@Composable
 private fun VoiceReplyBody(s: VoiceReply.State, n: CarNotification) {
    val navigator = LocalCarNavigator.current
    val who = n.title.ifBlank { n.appLabel }
    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
        when (s.phase) {
            VoiceReply.Phase.OFFERING, VoiceReply.Phase.ASKING, VoiceReply.Phase.LISTENING -> ListeningDot()
            VoiceReply.Phase.SENT -> Icon(Icons.Filled.Check, null, Modifier.size(32.dp), tint = MaterialTheme.colorScheme.primary)
            else -> NotificationIcon(n, size = 44.dp)
        }
        Column(Modifier.weight(1f)) {
            Text(voiceHeading(s, who), style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold, maxLines = 1, overflow = TextOverflow.Ellipsis)
            voiceDetail(s, n)?.let {
                Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 3, overflow = TextOverflow.Ellipsis)
            }
        }
    }
    if (s.phase == VoiceReply.Phase.CONFIRMING) {
        Text("Say “cancel” or “change it”", style = MaterialTheme.typography.labelLarge, color = MaterialTheme.colorScheme.primary)
    }
    if ((s.phase == VoiceReply.Phase.READ || s.phase == VoiceReply.Phase.OFFERING) && n.reply != null) {
        QuickReplies(n)
    }
    Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
        val wide = Modifier.weight(1f)
        when (s.phase) {
            VoiceReply.Phase.READING, VoiceReply.Phase.READ -> {
                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) {
                    Text(if (s.phase == VoiceReply.Phase.READING) "Stop" else "Close")
                }
                if (n.reply != null) {
                    GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, modifier = wide) {
                        ReplyGlyph(Modifier.size(20.dp))
                        Text("Reply", Modifier.padding(start = 8.dp))
                    }
                }
            }
            VoiceReply.Phase.OFFERING -> {
                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("No") }
                GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, modifier = wide) {
                    ReplyGlyph(Modifier.size(20.dp))
                    Text("Reply", Modifier.padding(start = 8.dp))
                }
            }
            VoiceReply.Phase.ASKING, VoiceReply.Phase.LISTENING ->
                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Cancel") }
            VoiceReply.Phase.CONFIRMING -> {
                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Cancel") }
                GsButton(onClick = VoiceReply::sendNow, modifier = wide) { Text("Send now") }
            }
            VoiceReply.Phase.ERROR -> {
                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Close") }
                if (n.reply != null) {
                    GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, tone = GsTone.Tonal, modifier = wide) { Text("Try again") }
                    GsButton(
                        onClick = { VoiceReply.cancel(); navigator.notifications(replyTo = n.key) },
                        tone = GsTone.Neutral, modifier = wide,
                    ) { Text("Type") }
                }
            }
            VoiceReply.Phase.SENT, VoiceReply.Phase.IDLE -> Unit
        }
    }
 }
 private fun voiceHeading(s: VoiceReply.State, who: String): String = when (s.phase) {
    VoiceReply.Phase.READING, VoiceReply.Phase.READ -> who
    VoiceReply.Phase.OFFERING, VoiceReply.Phase.ASKING -> "Reply to $who"
    VoiceReply.Phase.LISTENING -> "Listening"
    VoiceReply.Phase.CONFIRMING -> "Sending to $who"
    VoiceReply.Phase.SENT -> "Sent to $who"
    VoiceReply.Phase.ERROR -> "Couldn't reply"
    VoiceReply.Phase.IDLE -> ""
 }
 private fun voiceDetail(s: VoiceReply.State, n: CarNotification): String? = when (s.phase) {
    VoiceReply.Phase.READING, VoiceReply.Phase.READ -> n.text
    VoiceReply.Phase.OFFERING -> s.heard.ifBlank { "Do you want to reply? Say yes or no." }
    VoiceReply.Phase.ASKING -> "Get ready to say your reply."
    VoiceReply.Phase.LISTENING -> s.heard.ifBlank { "Say your reply" }
    VoiceReply.Phase.CONFIRMING, VoiceReply.Phase.SENT -> "“${s.heard}”"
    VoiceReply.Phase.ERROR -> s.error
    VoiceReply.Phase.IDLE -> null
 }
 /** Ready-made answers, one tap each: sent at once, with no voice. */
@Composable
 internal fun QuickReplies(n: CarNotification, modifier: Modifier = Modifier) {
    Row(
        modifier.fillMaxWidth().horizontalScroll(rememberScrollState()),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        VoiceReply.quickReplies().forEach { text ->
            GsButton(onClick = { VoiceReply.quickReply(n, text) }, tone = GsTone.Neutral) {
                Text(text, style = MaterialTheme.typography.labelLarge, maxLines = 1)
            }
        }
    }
 }
@Composable
 private fun ListeningDot(modifier: Modifier = Modifier) {
    Box(
        modifier.size(44.dp).clip(CircleShape).background(MaterialTheme.colorScheme.primary),
        contentAlignment = Alignment.Center,
    ) {
        MicGlyph(Modifier.size(24.dp))
    }
 }
@@ -0,0 +1,198 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.content.Intent
 import android.provider.Settings
 import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.notify.CarNotification
 import app.seb3thehacker.gearslip.notify.CarNotifications
 import app.seb3thehacker.gearslip.notify.ChatLine
 import java.text.DateFormat
 import java.util.Date
 /** Lines a collapsed conversation shows; tapping it shows the rest the app sent. */
 private const val COLLAPSED_LINES = 2
 /**
 * A messaging app's recent conversations, the way Android Auto shows them: the app has no car
 * screen of its own, so each thread comes from the notification it has on the phone, newest
 * first, with reply and mark-as-read when the app offers them.
 */
@Composable
 fun MessagesScreen(packageName: String) {
    val history by CarNotifications.history.collectAsState()
    val listening by CarNotifications.listening.collectAsState()
    val navigator = LocalCarNavigator.current
    val context = LocalContext.current.applicationContext
    val entry = remember(packageName) { findEntry(MESSAGING_PREFIX + packageName) }
    val label = entry?.label ?: history.firstOrNull { it.packageName == packageName }?.appLabel ?: "Messages"
    val threads = history.filter { it.packageName == packageName }
    LaunchedEffect(history) { CarNotifications.dismissPopupFrom(packageName) }
    Column(Modifier.fillMaxSize().padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", navigator::back)
            entry?.icon?.let { Image(it, contentDescription = null, modifier = Modifier.size(36.dp).clip(RoundedCornerShape(8.dp))) }
            Text(label, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
        }
        if (!listening) {
            AccessBanner {
                context.startActivity(
                    Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
                )
            }
        }
        if (threads.isEmpty()) {
            Text(
                "No recent messages. New $label messages appear here as they arrive on the phone.",
                style = MaterialTheme.typography.bodyLarge,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
        } else {
            LazyColumn(
                verticalArrangement = Arrangement.spacedBy(10.dp),
                contentPadding = PaddingValues(bottom = 16.dp),
            ) {
                items(threads, key = { it.key }) { n ->
                    ConversationCard(
                        n,
                        onRead = { VoiceReply.read(n) },
                        onReply = { VoiceReply.reply(n) },
                        onMarkRead = { CarNotifications.markThreadRead(context, n) },
                    )
                }
            }
        }
    }
 }
@Composable
 private fun ConversationCard(n: CarNotification, onRead: () -> Unit, onReply: () -> Unit, onMarkRead: () -> Unit) {
    var expanded by rememberSaveable(n.key) { mutableStateOf(false) }
    // An app that posts plain notifications instead of a conversation still gets one line.
    val lines = n.lines.ifEmpty { listOf(ChatLine(n.title.ifBlank { n.appLabel }, n.text.ifBlank { n.title }, n.postedAt)) }
    val shown = if (expanded) lines else lines.takeLast(COLLAPSED_LINES)
    val dim = n.read || n.replied
    var quick by rememberSaveable(n.key) { mutableStateOf(false) }
    Surface(
        shape = RoundedCornerShape(16.dp),
        color = MaterialTheme.colorScheme.surfaceContainer,
        modifier = Modifier
            .fillMaxWidth()
            .animateContentSize()
            .clickable(enabled = lines.size > COLLAPSED_LINES) { expanded = !expanded },
    ) {
        Row(
            Modifier.padding(14.dp),
            verticalAlignment = Alignment.Top,
            horizontalArrangement = Arrangement.spacedBy(14.dp),
        ) {
            NotificationIcon(n, size = 52.dp)
            Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp)) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Text(
                        n.title.ifBlank { n.appLabel },
                        style = MaterialTheme.typography.titleLarge,
                        fontWeight = if (dim) FontWeight.Medium else FontWeight.Bold,
                        maxLines = 1,
                        overflow = TextOverflow.Ellipsis,
                        modifier = Modifier.weight(1f, fill = false),
                    )
                    Text(
                        "  ·  ${DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(n.postedAt))}",
                        style = MaterialTheme.typography.labelLarge,
                        color = MaterialTheme.colorScheme.onSurfaceVariant,
                        maxLines = 1,
                    )
                }
                if (!expanded && lines.size > COLLAPSED_LINES) {
                    Text(
                        "${lines.size - COLLAPSED_LINES} earlier",
                        style = MaterialTheme.typography.labelMedium,
                        color = MaterialTheme.colorScheme.primary,
                    )
                }
                shown.forEach { MessageLine(it, showSender = n.isGroup) }
                if (quick) QuickReplies(n, Modifier.padding(top = 6.dp))
            }
            Column(horizontalAlignment = Alignment.End, verticalArrangement = Arrangement.spacedBy(8.dp)) {
                if (n.replied) {
                    Icon(Icons.Filled.Check, contentDescription = "Replied", tint = MaterialTheme.colorScheme.primary)
                }
                GsButton(onClick = onRead, tone = GsTone.Neutral) {
                    ReadGlyph(Modifier.size(20.dp))
                    Text("Read", Modifier.padding(start = 8.dp))
                }
                if (n.reply != null) {
                    GsButton(onClick = onReply, tone = GsTone.Tonal) {
                        ReplyGlyph(Modifier.size(20.dp))
                        Text("Reply", Modifier.padding(start = 8.dp))
                    }
                }
                if (n.reply != null) {
                    GsButton(onClick = { quick = !quick }, tone = GsTone.Neutral) {
                        Text(if (quick) "Hide quick replies" else "Quick reply")
                    }
                }
                if (n.markRead != null) {
                    GsButton(onClick = onMarkRead, tone = GsTone.Neutral) { Text("Mark read") }
                }
            }
        }
    }
 }
@Composable
 private fun MessageLine(line: ChatLine, showSender: Boolean) {
    val who = when {
        line.sender == null -> "You: "
        showSender -> "${line.sender}: "
        else -> ""
    }
    Text(
        who + line.text,
        style = MaterialTheme.typography.bodyLarge,
        color = if (line.sender == null) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
        maxLines = 3,
        overflow = TextOverflow.Ellipsis,
    )
 }
@@ -0,0 +1,278 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.Settings
 import androidx.compose.material.icons.filled.Share
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.car.theme.GsButton
 import app.seb3thehacker.gearslip.car.theme.GsTone
 import app.seb3thehacker.gearslip.host.CarAppConnection
 import app.seb3thehacker.gearslip.media.CarMedia
 /** What a built-in app's id carries in a pin, so it can't collide with an installed app's component. */
 internal const val BUILT_IN_PREFIX = "gearslip:"
 /** One of Gearslip's own apps: a screen, with nothing running behind it once you leave. */
 internal class BuiltInApp(
    val id: String,
    val label: String,
    val glyph: ImageVector,
    val screen: CarScreen,
    val open: (CarNavigator) -> Unit,
 )
 internal object BuiltInApps {
    val Web = BuiltInApp("web", "Web", Icons.Filled.Search, CarScreen.App("web")) { it.open("web") }
    val ScreenSharing = BuiltInApp("phone", "Screen sharing", Icons.Filled.Share, CarScreen.App("phone")) { it.open("phone") }
    val Phone = BuiltInApp("dialer", "Phone", Icons.Filled.Call, CarScreen.App("dialer")) { it.open("dialer") }
    val VehicleData = BuiltInApp("vehicle", "Vehicle data", Icons.Filled.Info, CarScreen.VehicleData) { it.vehicleData() }
    val Settings = BuiltInApp("settings", "Settings", Icons.Filled.Settings, CarScreen.Settings) { it.settings() }
    val all = listOf(Web, ScreenSharing, Phone, VehicleData, Settings)
    val entries: List<Entry> = all.map { Entry(it.label, icon = null, builtIn = it) }
 }
 /** Vehicle data is experimental: raw, unverified sensor labels (see [CarSensors]). */
@Composable
 internal fun rememberVehicleDataShown(): Boolean {
    val experimental by CarSettings.experimentalFeaturesEnabled.collectAsState()
    val sensors by CarSettings.carSensorsEnabled.collectAsState()
    return experimental && sensors
 }
 /**
 * Where an open app lives - decides where tapping it goes and how it closes. Gearslip's own
 * apps have no connection behind them, so [SCREEN] is simply "on screen right now".
 */
 internal enum class RunningSlot { NAV, BROWSE, MEDIA, SCREEN }
 /**
 * Apps open right now, as component id to where they live, in the order the nav bar shows them:
 * the map, then a browsed templated app, then the media app, then whichever built-in app is on
 * screen. The map and a browsed app count from the moment they start connecting until they're
 * closed. The media app counts while it has something loaded to play - the same rule the nav
 * bar's player follows, so the two always show up together - or while its own screen is up.
 */
@Composable
 internal fun rememberRunningApps(): Map<String, RunningSlot> {
    val navStatus by CarServices.nav.status.collectAsState()
    val browseStatus by CarServices.browse.status.collectAsState()
    val mediaApp by CarServices.mediaApp.collectAsState()
    val mediaPhase by CarServices.media.phase.collectAsState()
    val now by CarServices.media.now.collectAsState()
    val current = LocalCarNavigator.current.current
    fun CarAppConnection.liveId(phase: CarAppConnection.Phase) =
        connectedComponent?.flattenToString()?.takeIf {
            phase == CarAppConnection.Phase.BINDING ||
                phase == CarAppConnection.Phase.HANDSHAKE ||
                phase == CarAppConnection.Phase.RUNNING
        }
    return buildMap {
        CarServices.nav.liveId(navStatus.phase)?.let { put(it, RunningSlot.NAV) }
        CarServices.browse.liveId(browseStatus.phase)?.let { put(it, RunningSlot.BROWSE) }
        val mediaLive = when (mediaPhase) {
            CarMedia.Phase.CONNECTING -> true
            CarMedia.Phase.READY -> now.isActive || current == CarScreen.Media
            else -> false
        }
        mediaApp?.component?.flattenToString()?.takeIf { mediaLive }?.let { put(it, RunningSlot.MEDIA) }
        BuiltInApps.all.firstOrNull { it.screen == current }?.let { put(BUILT_IN_PREFIX + it.id, RunningSlot.SCREEN) }
        (current as? CarScreen.Messages)?.let { put(MESSAGING_PREFIX + it.packageName, RunningSlot.SCREEN) }
    }
 }
 /** The screen an open app is showing on, so its nav bar icon can stay pressed in while it's up. */
 internal fun RunningSlot.isShowing(current: CarScreen): Boolean = when (this) {
    RunningSlot.NAV -> current == CarScreen.Home
    RunningSlot.BROWSE -> current == CarScreen.Browse
    RunningSlot.MEDIA -> current == CarScreen.Media
    RunningSlot.SCREEN -> true
 }
 /**
 * Brings an app up: back to its screen if it's already open - never a reconnect, which would
 * throw away the route or restart the session - otherwise a fresh launch.
 */
 internal fun openApp(entry: Entry, slot: RunningSlot?, navigator: CarNavigator, frame: CarEnvironment.Frame) {
    when (slot) {
        RunningSlot.NAV -> navigator.home()
        RunningSlot.BROWSE -> navigator.browse(entry.label)
        RunningSlot.MEDIA -> navigator.media()
        RunningSlot.SCREEN -> Unit
        null -> launchEntry(entry, navigator, frame)
    }
 }
 internal fun closeApp(slot: RunningSlot, navigator: CarNavigator) {
    when (slot) {
        RunningSlot.NAV -> CarServices.stopNav()
        RunningSlot.BROWSE -> CarServices.stopBrowse()
        RunningSlot.MEDIA -> CarServices.closeMedia()
        RunningSlot.SCREEN -> Unit
    }
    if (slot != RunningSlot.NAV && slot.isShowing(navigator.current)) navigator.back()
 }
 /**
 * What a long press on an app offers - pin it to or unpin it from the nav bar, move it along the
 * launcher, and close it if it's open - as a card in the middle of the screen with car-sized buttons, over a scrim that
 * dismisses it. Drawn in the car UI's own layout rather than a system popup window, which the
 * car's virtual display has no reason to host well.
 */
@Composable
 internal fun AppMenu(navigator: CarNavigator, running: Map<String, RunningSlot>) {
    val id = navigator.appMenu ?: return
    val entry = findEntry(id)
    if (entry == null) {
        navigator.dismissAppMenu()
        return
    }
    val pinned by CarSettings.pinnedApps.collectAsState()
    val isPinned = id in pinned
    val barFull = !isPinned && pinned.size >= CarSettings.MAX_PINNED
    val slot = running[id]
    Box(
        Modifier
            .fillMaxSize()
            .background(Color.Black.copy(alpha = 0.5f))
            .clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                onClick = navigator::dismissAppMenu,
            ),
        contentAlignment = Alignment.Center,
    ) {
        Surface(
            shape = RoundedCornerShape(24.dp),
            color = MaterialTheme.colorScheme.surfaceContainerHigh,
            // Swallows taps on the card itself, so only the scrim around it dismisses.
            modifier = Modifier
                .widthIn(max = 420.dp)
                .clickable(
                    interactionSource = remember { MutableInteractionSource() },
                    indication = null,
                    onClick = {},
                ),
        ) {
            Column(Modifier.padding(20.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    entry.icon?.let { Image(it, null, Modifier.size(44.dp).clip(RoundedCornerShape(10.dp))) }
                    entry.builtIn?.let { Icon(it.glyph, null, Modifier.size(36.dp)) }
                    Text(
                        entry.label,
                        style = MaterialTheme.typography.titleLarge,
                        fontWeight = FontWeight.SemiBold,
                        modifier = Modifier.padding(start = 14.dp),
                    )
                }
                GsButton(
                    onClick = {
                        CarSettings.togglePin(id)
                        navigator.dismissAppMenu()
                    },
                    tone = GsTone.Tonal,
                    enabled = !barFull,
                    modifier = Modifier.fillMaxWidth().height(56.dp),
                ) {
                    Text(
                        when {
                            isPinned -> "Unpin from nav bar"
                            barFull -> "Nav bar is full (${CarSettings.MAX_PINNED} pinned)"
                            else -> "Pin to nav bar"
                        },
                        style = MaterialTheme.typography.titleMedium,
                    )
                }
                if (navigator.current == CarScreen.Apps) MoveButtons(id)
                if (slot != null) {
                    GsButton(
                        onClick = {
                            closeApp(slot, navigator)
                            navigator.dismissAppMenu()
                        },
                        tone = GsTone.Danger,
                        modifier = Modifier.fillMaxWidth().height(56.dp),
                    ) { Text("Close app", style = MaterialTheme.typography.titleMedium) }
                }
                GsButton(
                    onClick = navigator::dismissAppMenu,
                    tone = GsTone.Neutral,
                    modifier = Modifier.fillMaxWidth().height(56.dp),
                ) { Text("Cancel", style = MaterialTheme.typography.titleMedium) }
            }
        }
    }
 }
 /**
 * Moves the app one place left or right on the launcher. The menu stays open so a tile can be
 * walked several places, and the grid behind the scrim shows where it went.
 */
@Composable
 private fun MoveButtons(id: String) {
    val custom by CarSettings.appOrder.collectAsState()
    val order = launcherOrder(rememberAllEntries(), rememberVehicleDataShown(), custom).mapNotNull { it.componentId }
    val index = order.indexOf(id)
    if (index < 0) return
    fun move(by: Int) {
        val next = order.toMutableList()
        java.util.Collections.swap(next, index, index + by)
        CarSettings.setAppOrder(next)
    }
    Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
        GsButton(
            onClick = { move(-1) },
            tone = GsTone.Tonal,
            enabled = index > 0,
            modifier = Modifier.weight(1f).height(56.dp),
        ) { Text("Move left", style = MaterialTheme.typography.titleMedium) }
        GsButton(
            onClick = { move(1) },
            tone = GsTone.Tonal,
            enabled = index < order.lastIndex,
            modifier = Modifier.weight(1f).height(56.dp),
        ) { Text("Move right", style = MaterialTheme.typography.titleMedium) }
    }
    if (custom.isNotEmpty()) {
        GsButton(
            onClick = { CarSettings.setAppOrder(emptyList()) },
            tone = GsTone.Neutral,
            modifier = Modifier.fillMaxWidth().height(56.dp),
        ) { Text("Reset app order", style = MaterialTheme.typography.titleMedium) }
    }
 }
@@ -0,0 +1,232 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.content.Intent
 import android.provider.Settings
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.automirrored.filled.Send
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Notifications
 import androidx.compose.material.icons.filled.Warning
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import app.seb3thehacker.gearslip.notify.CarNotification
 import app.seb3thehacker.gearslip.notify.CarNotifications
 import kotlinx.coroutines.delay
 import java.text.DateFormat
 import java.util.Date
 /**
 * Replying to one notification. The list itself lives on the dashboard (see
 * [NotificationsSection]); with nothing to reply to, this is just the dashboard.
 */
@Composable
 fun NotificationsScreen(replyTo: String?) {
    val history by CarNotifications.history.collectAsState()
    val navigator = LocalCarNavigator.current
    val target = history.firstOrNull { it.key == replyTo && it.reply != null }
    if (target != null) {
        ReplyPane(target, onDone = navigator::back)
    } else {
        CarDashboardScreen()
    }
 }
 /**
 * The notification history, under the calendar on the dashboard. Replying opens its own pane.
 * Anything arriving while this is on screen is being looked at, so it never counts as unread.
 */
@Composable
 fun NotificationsSection() {
    val history by CarNotifications.history.collectAsState()
    val listening by CarNotifications.listening.collectAsState()
    val navigator = LocalCarNavigator.current
    val context = LocalContext.current.applicationContext
    LaunchedEffect(history) { CarNotifications.markRead() }
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Row(verticalAlignment = Alignment.CenterVertically) {
            Text(
                "Notifications",
                style = MaterialTheme.typography.titleMedium,
                color = MaterialTheme.colorScheme.primary,
                modifier = Modifier.weight(1f),
            )
            if (history.isNotEmpty()) TextButton(onClick = CarNotifications::clear) { Text("Clear all") }
        }
        if (!listening) {
            AccessBanner {
                context.startActivity(
                    Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
                )
            }
        }
        if (history.isEmpty()) {
            Text(
                "Nothing yet. New notifications from the phone will show up here.",
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
        } else {
            history.forEach { n ->
                key(n.key) { NotificationRow(n) { navigator.notifications(replyTo = it.key) } }
            }
        }
    }
 }
@Composable
 internal fun AccessBanner(onOpen: () -> Unit) {
    Surface(
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.errorContainer,
        contentColor = MaterialTheme.colorScheme.onErrorContainer,
        modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
    ) {
        Row(
            Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            Icon(Icons.Filled.Warning, contentDescription = null)
            Text(
                "Notifications are off. Allow Gearslip under Settings > Notifications > Notification access on the phone.",
                style = MaterialTheme.typography.bodyMedium,
                modifier = Modifier.weight(1f),
            )
            GsButton(onClick = onOpen) { Text("Open") }
        }
    }
 }
@Composable
 private fun NotificationRow(n: CarNotification, onReply: (CarNotification) -> Unit) {
    Surface(
        shape = RoundedCornerShape(16.dp),
        color = MaterialTheme.colorScheme.surfaceContainer,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.padding(12.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            NotificationIcon(n)
            Column(Modifier.weight(1f)) {
                Text(
                    "${n.appLabel}  ·  ${DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(n.postedAt))}",
                    style = MaterialTheme.typography.labelMedium,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
                if (n.title.isNotBlank()) {
                    Text(n.title, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold, maxLines = 1, overflow = TextOverflow.Ellipsis)
                }
                if (n.text.isNotBlank()) {
                    Text(n.text, style = MaterialTheme.typography.bodyMedium, maxLines = 2, overflow = TextOverflow.Ellipsis)
                }
            }
            when {
                n.replied -> Icon(Icons.Filled.Check, contentDescription = "Replied", tint = MaterialTheme.colorScheme.primary)
                n.reply != null -> GsButton(onClick = { VoiceReply.reply(n) }, tone = GsTone.Tonal) {
                    ReplyGlyph(Modifier.size(20.dp))
                    Text("Reply", Modifier.padding(start = 8.dp))
                }
            }
        }
    }
 }
@Composable
 internal fun NotificationIcon(n: CarNotification, size: androidx.compose.ui.unit.Dp = 44.dp) {
    val icon = n.icon
    if (icon != null) {
        Image(icon.asImageBitmap(), contentDescription = null, modifier = Modifier.size(size).clip(RoundedCornerShape(10.dp)))
    } else {
        Icon(Icons.Filled.Notifications, contentDescription = null, modifier = Modifier.size(size))
    }
 }
 /** Same shape as search: a field on top, the host's own keyboard below. */
@Composable
 private fun ReplyPane(n: CarNotification, onDone: () -> Unit) {
    val context = LocalContext.current.applicationContext
    var text by remember(n.key) { mutableStateOf("") }
    fun send() {
        if (text.isBlank()) return
        CarNotifications.reply(context, n, text.trim())
        onDone()
    }
    Column(Modifier.fillMaxSize()) {
        Row(
            Modifier.padding(horizontal = 12.dp, vertical = 6.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(8.dp),
        ) {
            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", onDone)
            Surface(
                shape = RoundedCornerShape(24.dp),
                color = MaterialTheme.colorScheme.surfaceContainerHighest,
                modifier = Modifier.weight(1f),
            ) {
                Text(
                    if (text.isEmpty()) "Reply to ${n.title.ifBlank { n.appLabel }}" else "$text|",
                    color = if (text.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                    modifier = Modifier.padding(horizontal = 16.dp, vertical = 10.dp),
                )
            }
        }
        // What is being answered, so the driver isn't replying blind.
        Row(
            Modifier.weight(1f).fillMaxWidth().padding(horizontal = 20.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            NotificationIcon(n)
            Text(n.text.ifBlank { n.title }, style = MaterialTheme.typography.bodyLarge, maxLines = 3, overflow = TextOverflow.Ellipsis)
        }
        CarKeyboard(
            text, onTextChange = { text = it }, onSubmit = ::send,
            submitImage = Icons.AutoMirrored.Filled.Send, onDismiss = onDone,
        )
    }
 }
@@ -0,0 +1,129 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Warning
 import app.seb3thehacker.gearslip.mirror.PhoneApp
 import app.seb3thehacker.gearslip.mirror.PhoneApps
 import app.seb3thehacker.gearslip.mirror.PhoneMirror
 import app.seb3thehacker.gearslip.mirror.TouchRelayService
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 /**
 * Starts a phone app on the car screen.
 *
 * Picking one hands the whole frame over to the mirror, so this screen is the last thing
 * Gearslip draws until mirroring stops - either from the notification on the phone, or by
 * tapping the black bars beside the mirrored picture.
 */
@Composable
 fun PhoneAppsScreen() {
    val context = LocalContext.current
    val apps by produceState(initialValue = PhoneApps.cached() ?: emptyList(), context) {
        value = PhoneApps.cached() ?: withContext(Dispatchers.IO) { PhoneApps.installed(context).also { PhoneApps.warm(context) } }
    }
    Column(Modifier.fillMaxSize().padding(horizontal = 20.dp, vertical = 12.dp)) {
        if (!TouchRelayService.enabled) {
            TouchRelayWarning()
            Spacer(Modifier.height(12.dp))
        }
        LazyVerticalGrid(
            columns = GridCells.Adaptive(minSize = 108.dp),
            modifier = Modifier.fillMaxSize(),
            contentPadding = PaddingValues(bottom = 8.dp),
            horizontalArrangement = Arrangement.spacedBy(12.dp),
            verticalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            items(apps) { app ->
                PhoneAppTile(app) { PhoneMirror.open(context, app.packageName) }
            }
        }
    }
 }
 /**
 * Mirroring shows the phone whether or not touch works, so this warns rather than blocks -
 * the picture is still useful, it just cannot be driven from the car yet.
 */
@Composable
 private fun TouchRelayWarning() {
    val context = LocalContext.current
    Surface(
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.errorContainer,
        contentColor = MaterialTheme.colorScheme.onErrorContainer,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            Icon(Icons.Filled.Warning, contentDescription = null)
            Text(
                "Touch is off. Enable Gearslip under Settings > Accessibility on the phone.",
                style = MaterialTheme.typography.bodyMedium,
                modifier = Modifier.weight(1f),
            )
            GsButton(onClick = { PhoneApps.openAccessibilitySettings(context) }) { Text("Open") }
        }
    }
 }
@Composable
 private fun PhoneAppTile(app: PhoneApp, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = Modifier.height(120.dp),
        colors = GsColors(MaterialTheme.colorScheme.surfaceVariant, MaterialTheme.colorScheme.onSurfaceVariant),
        shape = MaterialTheme.shapes.extraLarge,
    ) {
        Column(
            Modifier.fillMaxSize().padding(8.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
            verticalArrangement = Arrangement.Center,
        ) {
            app.icon?.let { Image(it, contentDescription = null, modifier = Modifier.size(52.dp)) }
            Spacer(Modifier.height(8.dp))
            Text(
                app.label,
                style = MaterialTheme.typography.labelLarge,
                fontWeight = FontWeight.SemiBold,
                textAlign = TextAlign.Center,
                maxLines = 2,
                overflow = TextOverflow.Ellipsis,
            )
        }
    }
 }
@@ -0,0 +1,377 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.Manifest
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
 import android.net.Uri
 import android.provider.ContactsContract
 import android.provider.Settings
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 /** A phone contact with at least one number, as read off the device's contacts. */
 internal data class Contact(val name: String, val number: String)
 private val CALL_PERMISSIONS = arrayOf(Manifest.permission.CALL_PHONE, Manifest.permission.READ_CONTACTS)
 /** Also used by [AssistantCommands] for "call <name>". */
 internal fun hasCallPermissions(context: Context): Boolean =
    CALL_PERMISSIONS.all { context.checkSelfPermission(it) == PackageManager.PERMISSION_GRANTED }
 internal fun loadContacts(context: Context): List<Contact> {
    if (context.checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) return emptyList()
    val out = mutableListOf<Contact>()
    val projection = arrayOf(
        ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
        ContactsContract.CommonDataKinds.Phone.NUMBER,
    )
    context.contentResolver.query(
        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
        projection, null, null,
        "${ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME} ASC",
    )?.use { cursor ->
        val nameIndex = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)
        val numberIndex = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)
        while (cursor.moveToNext()) {
            val name = cursor.getString(nameIndex) ?: continue
            val number = cursor.getString(numberIndex) ?: continue
            out += Contact(name, number)
        }
    }
    return out.distinctBy { it.number }
 }
 internal fun placeCall(context: Context, number: String) {
    if (number.isBlank()) return
    if (context.checkSelfPermission(Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) return
    runCatching {
        context.startActivity(
            Intent(Intent.ACTION_CALL, Uri.parse("tel:${Uri.encode(number)}")).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
        )
    }
 }
 private const val TAB_CONTACTS = 0
 private const val TAB_KEYPAD = 1
 /** Dialing a number or calling a contact from the car screen: a contacts tab and a keypad tab. */
@Composable
 fun PhoneDialerScreen() {
    val context = LocalContext.current
    val hasPermissions = hasCallPermissions(context)
    var tab by remember { mutableStateOf(TAB_CONTACTS) }
    Column(Modifier.fillMaxSize().padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        // The tabs share the title's row, so the list and keypad get the height back.
        Row(Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
            Text(
                "Phone",
                style = MaterialTheme.typography.headlineSmall,
                fontWeight = FontWeight.Bold,
                modifier = Modifier.weight(1f),
            )
            if (hasPermissions) {
                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                    DialerTab("Contacts", tab == TAB_CONTACTS, Modifier.width(140.dp)) { tab = TAB_CONTACTS }
                    DialerTab("Keypad", tab == TAB_KEYPAD, Modifier.width(140.dp)) { tab = TAB_KEYPAD }
                }
            }
        }
        if (!hasPermissions) {
            MissingPermission(context)
            return@Column
        }
        Box(Modifier.weight(1f).fillMaxWidth()) {
            if (tab == TAB_CONTACTS) ContactsList(context) else Keypad(context)
        }
    }
 }
@Composable
 private fun MissingPermission(context: Context) {
    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
        Text(
            "Gearslip needs the Phone and Contacts permissions to dial from here. Grant them " +
                "from the app's settings.",
            style = MaterialTheme.typography.bodyLarge,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
        GsButton(tone = GsTone.Tonal, onClick = {
            context.startActivity(
                Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", context.packageName, null)),
            )
        }) { Text("Open app settings") }
    }
 }
@Composable
 private fun DialerTab(label: String, selected: Boolean, modifier: Modifier, onClick: () -> Unit) {
    GsIconBox(
        onClick = onClick,
        modifier = modifier.height(44.dp),
        colors = if (selected) GsColors(MaterialTheme.colorScheme.primaryContainer, MaterialTheme.colorScheme.onPrimaryContainer)
        else GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
        shape = MaterialTheme.shapes.large,
        latched = selected,
    ) {
        Text(label, style = MaterialTheme.typography.titleMedium, fontWeight = if (selected) FontWeight.Bold else FontWeight.Normal)
    }
 }
 /**
 * A 3-column digit grid beside a fourth column holding backspace and call, stacked - four equal
 * columns in all. Every row and both side buttons take an equal weighted share of whatever height
 * is available, so this fits the car's short landscape frame without scrolling instead of
 * overflowing off the bottom the way fixed-height rows did.
 */
@Composable
 private fun Keypad(context: Context) {
    var number by remember { mutableStateOf("") }
    val rows = listOf(
        listOf("1", "2", "3"),
        listOf("4", "5", "6"),
        listOf("7", "8", "9"),
        listOf("*", "0", "#"),
    )
    Column(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(12.dp)) {
        Text(
            number.ifEmpty { "Enter a number" },
            style = MaterialTheme.typography.headlineSmall,
            color = if (number.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
            modifier = Modifier.padding(vertical = 6.dp),
        )
        Row(Modifier.weight(1f).fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
            Column(Modifier.weight(3f).fillMaxHeight(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                rows.forEach { row ->
                    Row(Modifier.weight(1f).fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                        row.forEach { digit ->
                            KeypadButton(digit, Modifier.weight(1f).fillMaxHeight()) { number += digit }
                        }
                    }
                }
            }
            Column(Modifier.weight(1f).fillMaxHeight(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                GsButton(
                    onClick = { if (number.isNotEmpty()) number = number.dropLast(1) },
                    tone = GsTone.Tonal,
                    enabled = number.isNotEmpty(),
                    modifier = Modifier.weight(1f).fillMaxWidth(),
                ) { Text("⌫", style = MaterialTheme.typography.titleLarge) }
                GsIconBox(
                    onClick = { placeCall(context, number) },
                    colors = gsColors(GsTone.Primary),
                    enabled = number.isNotEmpty(),
                    modifier = Modifier.weight(1f).fillMaxWidth(),
                ) { Icon(Icons.Filled.Call, "Call") }
            }
        }
    }
 }
@Composable
 private fun KeypadButton(digit: String, modifier: Modifier, onClick: () -> Unit) {
    GsIconBox(
        onClick,
        modifier,
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
        shape = MaterialTheme.shapes.large,
    ) {
        Text(digit, style = MaterialTheme.typography.titleLarge)
    }
 }
@Composable
 private fun ContactsList(context: Context) {
    val contacts by produceState(emptyList<Contact>(), context) {
        value = withContext(Dispatchers.IO) { loadContacts(context) }
    }
    var query by remember { mutableStateOf("") }
    var searching by remember { mutableStateOf(false) }
    var pendingCall by remember { mutableStateOf<Contact?>(null) }
    val filtered = remember(contacts, query) {
        if (query.isBlank()) contacts
        else contacts.filter { it.name.contains(query, ignoreCase = true) || it.number.contains(query) }
    }
    Column(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
        if (contacts.isNotEmpty()) {
            ContactSearchField(query, searching, onToggle = { searching = !searching })
        }
        // The list (and its empty states) sit between the search field and the keyboard, never
        // under either - the keyboard is docked at the bottom instead of jammed in right below
        // the field, so results stay visible while typing rather than getting squeezed out.
        Box(Modifier.weight(1f).fillMaxWidth()) {
            when {
                contacts.isEmpty() -> Text(
                    "No contacts with a phone number found.",
                    style = MaterialTheme.typography.bodyLarge,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
                filtered.isEmpty() -> Text(
                    "No contacts match \"$query\".",
                    style = MaterialTheme.typography.bodyLarge,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
                else -> LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                    items(filtered) { contact ->
                        ContactRow(contact) { pendingCall = contact }
                    }
                }
            }
        }
        if (searching) {
            CarKeyboard(
                query,
                onTextChange = { query = it },
                onSubmit = { searching = false },
                onDismiss = { searching = false },
            )
        }
    }
    pendingCall?.let { contact ->
        ConfirmCallOverlay(
            contact = contact,
            onConfirm = { placeCall(context, contact.number); pendingCall = null },
            onDismiss = { pendingCall = null },
        )
    }
 }
 /**
 * A plain Compose overlay, not [androidx.compose.material3.AlertDialog] - that opens a real
 * Android Dialog/window, and this UI lives in a Presentation on a virtual display where a second
 * window of the wrong type crashes outright ("Window type mismatch"). Every other popup in the
 * car UI is drawn in-composition for the same reason; this just follows suit.
 */
@Composable
 private fun ConfirmCallOverlay(contact: Contact, onConfirm: () -> Unit, onDismiss: () -> Unit) {
    Box(
        Modifier.fillMaxSize().background(Color.Black.copy(alpha = 0.6f)).clickable(
            indication = null,
            interactionSource = remember { MutableInteractionSource() },
            onClick = onDismiss,
        ),
        contentAlignment = Alignment.Center,
    ) {
        Surface(
            onClick = {},
            shape = MaterialTheme.shapes.extraLarge,
            color = MaterialTheme.colorScheme.surfaceContainerHigh,
            modifier = Modifier.fillMaxWidth(0.85f).padding(16.dp),
        ) {
            Column(
                Modifier.padding(32.dp),
                verticalArrangement = Arrangement.spacedBy(20.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
            ) {
                Text("Call ${contact.name}?", style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
                Text(contact.number, style = MaterialTheme.typography.titleLarge, color = MaterialTheme.colorScheme.onSurfaceVariant)
                Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(16.dp)) {
                    GsButton(onClick = onDismiss, tone = GsTone.Outline, modifier = Modifier.weight(1f).height(56.dp)) {
                        Text("Cancel", style = MaterialTheme.typography.titleMedium)
                    }
                    GsButton(onClick = onConfirm, modifier = Modifier.weight(1f).height(56.dp)) {
                        Text("Call", style = MaterialTheme.typography.titleMedium)
                    }
                }
            }
        }
    }
 }
@Composable
 private fun ContactSearchField(query: String, active: Boolean, onToggle: () -> Unit) {
    Surface(
        onClick = onToggle,
        shape = MaterialTheme.shapes.large,
        color = if (active) MaterialTheme.colorScheme.primaryContainer else MaterialTheme.colorScheme.surfaceContainerHigh,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Text(
            query.ifEmpty { "Search contacts" },
            style = MaterialTheme.typography.bodyLarge,
            color = if (query.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
            modifier = Modifier.padding(horizontal = 16.dp, vertical = 14.dp),
        )
    }
 }
@Composable
 private fun ContactRow(contact: Contact, onClick: () -> Unit) {
    Surface(
        onClick = onClick,
        shape = MaterialTheme.shapes.large,
        color = MaterialTheme.colorScheme.surfaceContainerHigh,
        modifier = Modifier.fillMaxWidth(),
    ) {
        Row(
            Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 12.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            Box(
                Modifier.size(40.dp).background(MaterialTheme.colorScheme.primaryContainer, CircleShape),
                contentAlignment = Alignment.Center,
            ) {
                Text(
                    contact.name.take(1).uppercase(),
                    style = MaterialTheme.typography.titleMedium,
                    color = MaterialTheme.colorScheme.onPrimaryContainer,
                    fontWeight = FontWeight.Bold,
                )
            }
            Column(Modifier.weight(1f)) {
                Text(contact.name, style = MaterialTheme.typography.titleMedium, maxLines = 1, overflow = TextOverflow.Ellipsis)
                Text(contact.number, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
            }
            Icon(Icons.Filled.Call, contentDescription = "Call", tint = MaterialTheme.colorScheme.primary)
        }
    }
 }
@@ -0,0 +1,236 @@
 package app.seb3thehacker.gearslip.car
 import android.media.session.PlaybackState
 import android.support.v4.media.session.PlaybackStateCompat
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Favorite
 import androidx.compose.material.icons.filled.FavoriteBorder
 import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.luminance
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.tween
 import app.seb3thehacker.gearslip.media.ArtColor
 import app.seb3thehacker.gearslip.media.MediaArt
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.drawable.toBitmap
 import app.seb3thehacker.gearslip.car.theme.GsIconBox
 import app.seb3thehacker.gearslip.car.theme.GsIconButton
 import app.seb3thehacker.gearslip.car.theme.GsSeekBar
 import app.seb3thehacker.gearslip.car.theme.GsTone
 import app.seb3thehacker.gearslip.car.theme.gsColors
 import app.seb3thehacker.gearslip.media.CarMedia
 import app.seb3thehacker.gearslip.media.CustomAction
 import app.seb3thehacker.gearslip.media.NowPlaying
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
 /*
 * The pieces every player on the car screen is built from - the media screen, the column beside
 * the map - so a button looks and behaves the same wherever it turns up.
 */
 /** The seek bar, with elapsed and total time under it when [showTimes]. */
@Composable
 internal fun PlayerProgress(now: NowPlaying, media: CarMedia, modifier: Modifier = Modifier, showTimes: Boolean = true) {
    if (now.durationMs <= 0) return
    var position by remember { mutableLongStateOf(now.currentPosition()) }
    LaunchedEffect(now) {
        while (true) {
            position = now.currentPosition()
            if (!now.playing) break
            delay(500)
        }
    }
    Column(modifier) {
        GsSeekBar(
            fraction = position.toFloat() / now.durationMs,
            onSeek = { media.seek((it * now.durationMs).toLong()) },
            enabled = now.canDo(PlaybackState.ACTION_SEEK_TO),
            modifier = Modifier.fillMaxWidth().padding(vertical = 4.dp),
        )
        if (showTimes) {
            Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween) {
                Text(formatDuration(position), style = MaterialTheme.typography.labelMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
                Text(formatDuration(now.durationMs), style = MaterialTheme.typography.labelMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
            }
        }
    }
 }
 /** "1:05" for under a minute past the hour, "1:01:05" once an hour is involved. */
 internal fun formatDuration(ms: Long): String {
    val totalSeconds = (ms / 1000).coerceAtLeast(0)
    val hours = totalSeconds / 3600
    val minutes = (totalSeconds % 3600) / 60
    val seconds = totalSeconds % 60
    return if (hours > 0) "%d:%02d:%02d".format(hours, minutes, seconds) else "%d:%02d".format(minutes, seconds)
 }
 /** Previous, play/pause, next. [skip] sizes the outer two; play is a step bigger. */
@Composable
 internal fun TransportRow(now: NowPlaying, media: CarMedia, skip: Dp, modifier: Modifier = Modifier) {
    val play = skip * 1.25f
    Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly, verticalAlignment = Alignment.CenterVertically) {
        GsIconButton(
            MediaIcons.Previous, "Previous", media::previous,
            enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_PREVIOUS), size = skip, iconSize = skip * 0.58f, shape = CircleShape,
        )
        GsIconButton(
            if (now.playing) MediaIcons.Pause else Icons.Filled.PlayArrow,
            if (now.playing) "Pause" else "Play",
            media::togglePlay,
            tone = GsTone.Primary, size = play, iconSize = play * 0.58f, shape = CircleShape,
        )
        GsIconButton(
            MediaIcons.Next, "Next", media::next,
            enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_NEXT), size = skip, iconSize = skip * 0.58f, shape = CircleShape,
        )
    }
 }
 /**
 * Like, shuffle and repeat, then up to [maxOther] of the app's other buttons, all icon-only. One
 * the app doesn't support stays on screen greyed out, so the row never shifts between apps.
 * [trailing] adds buttons of the caller's own at the end (the side column's lyrics button).
 */
@Composable
 internal fun PlayModeRow(
    now: NowPlaying,
    media: CarMedia,
    size: Dp,
    modifier: Modifier = Modifier,
    maxOther: Int = 0,
    trailing: @Composable RowScope.() -> Unit = {},
 ) {
    val modes by media.modes.collectAsState()
    val liked = now.liked
    val shuffleKnown = modes.shuffle != PlaybackStateCompat.SHUFFLE_MODE_INVALID
    val repeatKnown = modes.repeat != PlaybackStateCompat.REPEAT_MODE_INVALID
    val shuffleOn = shuffleKnown && modes.shuffle != PlaybackStateCompat.SHUFFLE_MODE_NONE
    val repeatOn = repeatKnown && modes.repeat != PlaybackStateCompat.REPEAT_MODE_NONE
    val icon = size * 0.52f
    Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly, verticalAlignment = Alignment.CenterVertically) {
        GsIconButton(
            if (liked == true) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
            if (liked == true) "Unlike" else "Like",
            media::toggleLike,
            enabled = liked != null,
            tone = if (liked == true) GsTone.Primary else GsTone.Neutral,
            size = size, iconSize = icon,
        )
        GsIconButton(
            MediaIcons.Shuffle, if (shuffleOn) "Shuffle off" else "Shuffle on",
            media::toggleShuffle,
            enabled = shuffleKnown || now.shuffleAction != null,
            tone = if (shuffleOn) GsTone.Primary else GsTone.Neutral,
            size = size, iconSize = icon,
        )
        GsIconButton(
            if (modes.repeat == PlaybackStateCompat.REPEAT_MODE_ONE) MediaIcons.RepeatOne else MediaIcons.Repeat,
            "Repeat",
            media::cycleRepeat,
            enabled = repeatKnown || now.repeatAction != null,
            tone = if (repeatOn) GsTone.Primary else GsTone.Neutral,
            size = size, iconSize = icon,
        )
        now.otherActions.take(maxOther).forEach { CustomActionButton(it, media, size) }
        trailing()
    }
 }
 /**
 * One of the app's own buttons, drawn with the app's own icon - it lives in the app's package,
 * not Gearslip's, so it's loaded from there. Its name stands in if the icon won't load.
 */
@Composable
 private fun CustomActionButton(action: CustomAction, media: CarMedia, size: Dp) {
    val icon = rememberActionIcon(action)
    GsIconBox(
        onClick = { media.custom(action) },
        modifier = Modifier.size(size),
        colors = gsColors(GsTone.Neutral),
    ) {
        if (icon != null) {
            Icon(icon, action.name, Modifier.size(size * 0.52f))
        } else {
            Text(action.name, style = MaterialTheme.typography.labelSmall, maxLines = 2, overflow = TextOverflow.Ellipsis)
        }
    }
 }
@Composable
 private fun rememberActionIcon(action: CustomAction): ImageBitmap? {
    val context = LocalContext.current
    val app by CarServices.mediaApp.collectAsState()
    val pkg = app?.component?.packageName
    val icon by produceState<ImageBitmap?>(null, pkg, action.icon) {
        value = if (pkg == null || action.icon == 0) null else withContext(Dispatchers.IO) {
            runCatching {
                context.packageManager.getResourcesForApplication(pkg)
                    .getDrawable(action.icon, null).toBitmap(96, 96).asImageBitmap()
            }.getOrNull()
        }
    }
    return icon
 }
 /** The track's art, from the session's bitmap or, failing that, its art URI. */
@Composable
 internal fun rememberArt(now: NowPlaying): android.graphics.Bitmap? {
    val context = LocalContext.current
    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
    return art
 }
 /**
 * A background taken from the album art's main colour, in place of [fallback]. Only the hue and a
 * capped amount of its saturation come from the art; the lightness stays close to the theme's
 * own ([darkLightness] or [lightLightness]), so text drawn in the theme's colours reads the same
 * on any cover. Art with no real colour in it keeps [fallback]. Fades between songs rather than
 * jumping.
 */
@Composable
 internal fun rememberArtColor(
    art: android.graphics.Bitmap?,
    fallback: Color,
    darkLightness: Float = 0.2f,
    lightLightness: Float = 0.86f,
 ): Color {
    val dark = fallback.luminance() < 0.5f
    val tint by produceState<ArtColor.Tint?>(null, art) {
        value = art?.let { withContext(Dispatchers.Default) { runCatching { ArtColor.of(it) }.getOrNull() } }
    }
    val target = tint?.let {
        if (dark) Color.hsl(it.hue, it.saturation.coerceIn(0.3f, 0.5f), darkLightness)
        else Color.hsl(it.hue, it.saturation.coerceIn(0.35f, 0.55f), lightLightness)
    } ?: fallback
    return animateColorAsState(target, tween(600), label = "art colour").value
 }
@@ -0,0 +1,42 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.mirror.PhoneApps
 import java.util.concurrent.Executors
 /**
 * Loads what the car screens show before anyone opens them: the car and media apps with their
 * icons, the phone's launcher apps, the weather and the calendar. Each screen paints from these
 * results at once and refreshes behind them, so nothing waits on the package manager, the
 * network or the calendar provider.
 *
 * Safe to call as often as you like: calls closer together than [MIN_GAP_MS] are dropped.
 */
 object Prefetch {
    private const val MIN_GAP_MS = 60_000L
    private val worker = Executors.newSingleThreadExecutor { Thread(it, "gearslip-prefetch").apply { isDaemon = true } }
    @Volatile private var lastRun = 0L
    /** [force] skips the throttle; use it when something changed, such as a permission grant. */
    fun warm(context: Context, force: Boolean = false) {
        val now = System.currentTimeMillis()
        if (!force && now - lastRun < MIN_GAP_MS) return
        lastRun = now
        val app = context.applicationContext
        worker.execute {
            val start = System.currentTimeMillis()
            step("launcher apps") { warmLauncherApps(app) }
            step("phone apps") { PhoneApps.warm(app) }
            step("weather and calendar") { warmDashboard(app) }
            GearslipLog.i("prefetch done in ${System.currentTimeMillis() - start}ms")
        }
    }
    // One failing loader must not stop the others.
    private fun step(name: String, block: () -> Unit) {
        runCatching(block).onFailure { GearslipLog.w("prefetch: $name failed: ${it.message}") }
    }
 }
@@ -0,0 +1,463 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import android.graphics.Rect
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.KeyboardArrowUp
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.rotate
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.car.app.model.CarIcon
 import androidx.car.app.model.Template
 import androidx.car.app.model.PlaceListMapTemplate
 import androidx.car.app.navigation.model.Lane
 import androidx.car.app.navigation.model.LaneDirection
 import androidx.car.app.navigation.model.MapTemplate
 import androidx.car.app.navigation.model.MapWithContentTemplate
 import androidx.car.app.navigation.model.NavigationTemplate
 import androidx.car.app.navigation.model.PlaceListNavigationTemplate
 import androidx.car.app.navigation.model.RoutePreviewNavigationTemplate
 import androidx.car.app.navigation.model.RoutingInfo
 import androidx.car.app.navigation.model.Step
 import androidx.car.app.navigation.model.TravelEstimate
 import app.seb3thehacker.gearslip.host.clockTime
 import app.seb3thehacker.gearslip.host.color
 import app.seb3thehacker.gearslip.host.image
 import app.seb3thehacker.gearslip.host.display
 import app.seb3thehacker.gearslip.host.remainingTime
 import app.seb3thehacker.gearslip.host.text
 /**
 * Draws the template an app handed us, over the surface it is drawing its map into.
 *
 * A templated app never draws its own chrome: it describes a screen in the Car App Library's
 * model types and every host renders those to suit its own screen. This is Gearslip's
 * rendering. It is deliberately laid out for a wide, short car display - controls to the
 * right where a hand reaches from the driver's seat, information to the left.
 *
 * Templates split into two kinds. The six map-backed ones here leave room for the app's own
 * drawing and lay chrome around it; everything else fills the screen and is drawn by
 * [ContentTemplate].
 */
@Composable
 fun TemplateChrome(template: Template?, modifier: Modifier = Modifier) {
    when (template) {
        null -> Unit
        is NavigationTemplate -> NavigationChrome(template, modifier)
        is MapWithContentTemplate -> MapWithContentChrome(template, modifier)
        is MapTemplate -> MapChrome(template, modifier)
        is PlaceListNavigationTemplate -> PlaceListNavigationChrome(template, modifier)
        is RoutePreviewNavigationTemplate -> RoutePreviewChrome(template, modifier)
        is PlaceListMapTemplate -> PlaceListMapChrome(template, modifier)
        else -> ContentTemplate(template, modifier)
    }
 }
 /**
 * How much of the surface Gearslip's chrome covers, so the app can keep what matters clear of
 * it. Expressed as the visible rectangle within a [width] x [height] surface.
 *
 * A template that isn't map-backed covers the surface completely, and reporting an empty
 * rectangle is how the app is told to stop bothering.
 */
 fun visibleAreaFor(template: Template?, width: Int, height: Int): Rect = when (template) {
    is NavigationTemplate -> Rect(0, 0, width, (height * (1f - ESTIMATE_FRACTION)).toInt())
    is MapWithContentTemplate, is MapTemplate, is PlaceListNavigationTemplate,
    is RoutePreviewNavigationTemplate, is PlaceListMapTemplate,
    -> Rect((width * CONTENT_PANE_FRACTION).toInt(), 0, width, height)
    null -> Rect(0, 0, width, height)
    else -> Rect(0, 0, 0, 0)
 }
 // --- navigation ------------------------------------------------------------------------------
@Composable
 private fun NavigationChrome(template: NavigationTemplate, modifier: Modifier) {
    val pan by CarServices.nav.panMode.collectAsState()
    Box(modifier.fillMaxWidth()) {
        if (!pan) (template.navigationInfo as? RoutingInfo)?.let {
            RoutingCard(it, Modifier.align(Alignment.TopStart).padding(12.dp).width(320.dp))
        }
        RightEdgeControls(
            if (pan) null else template.actionStrip,
            template.mapActionStrip,
            Modifier.align(Alignment.TopEnd).padding(12.dp),
        )
        if (!pan) template.destinationTravelEstimate?.let {
            TravelEstimateBar(it, Modifier.align(Alignment.BottomStart).padding(12.dp))
        }
    }
 }
 /** The manoeuvre card: what to do next, how far away it is, and onto what road. */
@Composable
 private fun RoutingCard(info: RoutingInfo, modifier: Modifier = Modifier) {
    if (info.isLoading) {
        ChromeSurface(modifier) {
            Text("Finding a route…", Modifier.padding(16.dp), style = ChromeType.title)
        }
        return
    }
    val step = info.currentStep ?: return
    ChromeSurface(modifier) {
        Column(Modifier.padding(14.dp)) {
            Row(verticalAlignment = Alignment.CenterVertically) {
                CarGlyph(step.maneuver?.icon, Modifier.size(44.dp))
                Spacer(Modifier.width(12.dp))
                Column(Modifier.weight(1f)) {
                    val distance = info.currentDistance.display()
                    if (distance.isNotEmpty()) {
                        Text(distance, style = ChromeType.headline)
                    }
                    Text(step.cue.text(), style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
                }
            }
            val road = step.road.text()
            if (road.isNotEmpty()) {
                Text(
                    road,
                    style = ChromeType.body,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                )
            }
            // Neither is sent by every app - most say only "turn left" and trust the driver to
            // find the lane themselves - so both are drawn only when there is something to draw.
            info.junctionImage?.let { junction ->
                Spacer(Modifier.height(10.dp))
                JunctionImage(junction)
            }
            LaneGuidance(step, Modifier.padding(top = 10.dp))
            info.nextStep?.let { next ->
                Spacer(Modifier.height(8.dp))
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Text("then", style = ChromeType.label, color = MaterialTheme.colorScheme.onSurfaceVariant)
                    Spacer(Modifier.width(8.dp))
                    CarGlyph(next.maneuver?.icon, Modifier.size(20.dp))
                    Spacer(Modifier.width(8.dp))
                    Text(next.cue.text(), style = ChromeType.body, maxLines = 1, overflow = TextOverflow.Ellipsis)
                }
            }
        }
    }
 }
 /** The zoomed-in intersection an app draws for a junction too complex for an arrow to explain. */
@Composable
 private fun JunctionImage(icon: CarIcon, modifier: Modifier = Modifier) {
    val bitmap = icon.image(LocalContext.current) ?: return
    Image(
        bitmap,
        contentDescription = null,
        contentScale = ContentScale.Fit,
        modifier = modifier.fillMaxWidth().heightIn(max = 120.dp),
    )
 }
 /**
 * Which lane to be in before the manoeuvre, either as the app's own picture ([Step.getLanesImage])
 * or as a row of arrows built from its structured lane data - whichever it sent. The recommended
 * lane, or lanes, stand out in the theme's own colour; the rest sit on the same muted, solid tile
 * everything else uses, never dimmed by transparency.
 */
@Composable
 private fun LaneGuidance(step: Step, modifier: Modifier = Modifier) {
    step.lanesImage?.let {
        JunctionImage(it, modifier)
        return
    }
    val lanes = step.lanes.orEmpty()
    if (lanes.isEmpty()) return
    Row(modifier, horizontalArrangement = Arrangement.spacedBy(6.dp)) {
        lanes.forEach { lane -> LaneTile(lane) }
    }
 }
@Composable
 private fun LaneTile(lane: Lane) {
    val directions = lane.directions.orEmpty()
    val shown = directions.firstOrNull { it.isRecommended } ?: directions.firstOrNull()
    val recommended = shown?.isRecommended == true
    Box(
        Modifier
            .size(36.dp)
            .clip(RoundedCornerShape(8.dp))
            .background(
                if (recommended) MaterialTheme.colorScheme.primaryContainer
                else MaterialTheme.colorScheme.surfaceContainerHighest,
            ),
        contentAlignment = Alignment.Center,
    ) {
        Icon(
            Icons.Filled.KeyboardArrowUp,
            contentDescription = if (recommended) "Recommended lane" else "Lane",
            tint = if (recommended) MaterialTheme.colorScheme.onPrimaryContainer
            else MaterialTheme.colorScheme.onSurfaceVariant,
            modifier = Modifier.size(24.dp).rotate(shown.turnDegrees()),
        )
    }
 }
 /** The one arrow glyph this app draws, turned to stand in for every shape a lane can permit. */
 private fun LaneDirection?.turnDegrees(): Float = when (this?.shape) {
    LaneDirection.SHAPE_SLIGHT_RIGHT -> 30f
    LaneDirection.SHAPE_NORMAL_RIGHT -> 90f
    LaneDirection.SHAPE_SHARP_RIGHT -> 135f
    LaneDirection.SHAPE_U_TURN_RIGHT -> 170f
    LaneDirection.SHAPE_SLIGHT_LEFT -> -30f
    LaneDirection.SHAPE_NORMAL_LEFT -> -90f
    LaneDirection.SHAPE_SHARP_LEFT -> -135f
    LaneDirection.SHAPE_U_TURN_LEFT -> -170f
    else -> 0f
 }
 /**
 * The trip at a glance: time and distance left, the clock time it ends at, and - beside them,
 * where a thumb reaches - the app's own way to stop navigating. A floating card rather than a
 * full-width bar, so it reads as one thing beside the manoeuvre card above it instead of a strip
 * that happens to hold three numbers. The close button is Gearslip's own, not the app's: an
 * actionStrip's actions carry no flag saying which one (if any) means "stop navigating" - the
 * first button here turned out to be a mute toggle, not an exit - so this leaves the app the way
 * going Home already does, rather than guess at the app's own controls and risk getting it wrong.
 */
@Composable
 private fun TravelEstimateBar(estimate: TravelEstimate, modifier: Modifier = Modifier) {
    val time = remainingTime(estimate.remainingTimeSeconds)
    val distance = estimate.remainingDistance.display()
    val arrival = estimate.arrivalTimeAtDestination.clockTime()
    val trip = estimate.tripText.text()
    if (time.isEmpty() && distance.isEmpty() && arrival.isEmpty() && trip.isEmpty()) return
    val detail = listOfNotNull(
        arrival.takeIf { it.isNotEmpty() },
        distance.takeIf { it.isNotEmpty() },
        trip.takeIf { it.isNotEmpty() },
    ).joinToString("  •  ")
    // The same solid card the manoeuvre card above it uses - one surface for the whole map
    // chrome, rather than this one spot styled on its own as a bar over the map.
    ChromeSurface(modifier, shadowElevation = 8.dp) {
        val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
        Row(
            Modifier.padding(start = 8.dp, end = 18.dp, top = 10.dp, bottom = 10.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            // Not a disconnect: the connection stays up and the app decides its own next screen.
            // Ending navigation is its own call, separate from a back press - a back press only
            // pops the on-screen card, leaving the app still believing it is navigating (so a
            // freshly picked destination silently does nothing); this is the call that actually
            // clears that flag on the app's side.
            GsIconButton(
                Icons.Filled.Close,
                "Stop navigating",
                { CarServices.nav.stopNavigating() },
                colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
                size = 40.dp,
                iconSize = 20.dp,
                shape = CircleShape,
            )
            Spacer(Modifier.width(10.dp))
            Column {
                if (time.isNotEmpty()) {
                    Text(
                        time,
                        style = ChromeType.headline,
                        color = estimate.remainingTimeColor.color(dark, MaterialTheme.colorScheme.onSurface),
                    )
                }
                if (detail.isNotEmpty()) {
                    Text(detail, style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant)
                }
            }
        }
    }
 }
 // --- map with a side pane ----------------------------------------------------------------------
 /**
 * The shape every remaining map-backed template shares: the app's map across the whole surface,
 * the template's content in a card floating over its left side, and both action strips stacked at
 * the right edge. The card is as tall as its content, up to the height of the screen, so a
 * handful of buttons no longer claim a whole column of the map. [fullHeight] is for content that
 * needs the room, such as a search field with its keyboard.
 */
@Composable
 private fun MapPaneLayout(
    modifier: Modifier,
    actionStrip: androidx.car.app.model.ActionStrip?,
    mapActionStrip: androidx.car.app.model.ActionStrip?,
    fullHeight: Boolean = false,
    pane: @Composable () -> Unit,
 ) {
    // Pan mode hands the whole screen to the map, leaving only its own controls.
    val pan by CarServices.nav.panMode.collectAsState()
    val edgeActions = (actionStrip?.actions.orEmpty() + mapActionStrip?.actions.orEmpty()).map { it.identity() }.toSet()
    androidx.compose.foundation.layout.BoxWithConstraints(modifier.fillMaxWidth()) {
        if (!pan) {
            ChromeSurface(
                Modifier
                    .align(Alignment.TopStart)
                    .padding(12.dp)
                    .width(maxOf(maxWidth * CONTENT_PANE_FRACTION - 12.dp, 232.dp))
                    .let { if (fullHeight) it.height(maxHeight - 24.dp) else it.heightIn(max = maxHeight - 24.dp) },
                shape = androidx.compose.foundation.shape.RoundedCornerShape(20.dp),
                shadowElevation = 8.dp,
            ) {
                androidx.compose.runtime.CompositionLocalProvider(LocalMapEdgeActions provides edgeActions) { pane() }
            }
        }
        RightEdgeControls(
            if (pan) null else actionStrip,
            mapActionStrip,
            Modifier.align(Alignment.TopEnd).padding(12.dp),
        )
    }
 }
@Composable
 private fun MapWithContentChrome(template: MapWithContentTemplate, modifier: Modifier) {
    MapPaneLayout(
        modifier,
        template.actionStrip,
        template.mapController?.mapActionStrip,
        fullHeight = template.contentTemplate.needsFullHeight(),
    ) {
        // A pane floating over the map is a place or a route the app is proposing, so its one
        // action - Start - counts itself down rather than waiting to be pressed; the same pane
        // filling a whole screen elsewhere gets no such push.
        ContentTemplate(template.contentTemplate, Modifier, autoStartPane = true)
    }
 }
@Composable
 private fun MapChrome(template: MapTemplate, modifier: Modifier) {
    MapPaneLayout(
        modifier,
        template.actionStrip,
        template.mapController?.mapActionStrip,
    ) {
        ChromeSurface(Modifier, shape = androidx.compose.foundation.shape.RoundedCornerShape(0.dp)) {
            Column {
                HeaderBar(
                    headerTitle(template.header, ""),
                    template.header?.startHeaderAction,
                    template.header?.endHeaderActions.orEmpty(),
                )
                if (template.pane != null) PaneRows(template.pane, autoStart = true)
                else ItemListColumn(template.itemList)
            }
        }
    }
 }
@Composable
 private fun PlaceListNavigationChrome(template: PlaceListNavigationTemplate, modifier: Modifier) {
    MapPaneLayout(modifier, template.actionStrip, template.mapActionStrip) {
        ListPane(
            headerTitle(template.header, template.title.text()),
            template.header?.startHeaderAction ?: template.headerAction,
            template.isLoading,
            template.itemList,
            Modifier,
        )
    }
 }
@Composable
 private fun PlaceListMapChrome(template: PlaceListMapTemplate, modifier: Modifier) {
    MapPaneLayout(modifier, template.actionStrip, null) {
        ListPane(
            template.title.text(),
            template.headerAction,
            template.isLoading,
            template.itemList,
            Modifier,
        )
    }
 }
 /** Route choices down the side, with the app's "start" action pinned under them. */
@Composable
 private fun RoutePreviewChrome(template: RoutePreviewNavigationTemplate, modifier: Modifier) {
    MapPaneLayout(modifier, template.actionStrip, template.mapActionStrip) {
        ChromeSurface(Modifier, shape = androidx.compose.foundation.shape.RoundedCornerShape(0.dp)) {
            Column {
                HeaderBar(
                    headerTitle(template.header, template.title.text()),
                    template.header?.startHeaderAction ?: template.headerAction,
                    template.header?.endHeaderActions.orEmpty(),
                )
                Box(Modifier.weight(1f, fill = false)) {
                    if (template.isLoading) {
                        Text("Finding routes…", Modifier.padding(14.dp), style = ChromeType.title)
                    } else {
                        ItemListColumn(template.itemList)
                    }
                }
                template.navigateAction?.let {
                    AutoStartButton(it, Modifier.padding(12.dp))
                }
            }
        }
    }
 }
@Composable
 private fun ListPane(
    title: String,
    startAction: androidx.car.app.model.Action?,
    loading: Boolean,
    itemList: androidx.car.app.model.ItemList?,
    modifier: Modifier,
 ) {
    ChromeSurface(modifier, shape = androidx.compose.foundation.shape.RoundedCornerShape(0.dp)) {
        Column {
            HeaderBar(title, startAction)
            if (loading) Text("Loading…", Modifier.padding(14.dp), style = ChromeType.title)
            else ItemListColumn(itemList)
        }
    }
 }
 /** Fraction of the surface the content pane covers beside a map. */
 private const val CONTENT_PANE_FRACTION = 0.42f
 /** Fraction of the surface the travel-estimate bar covers along the bottom. */
 private const val ESTIMATE_FRACTION = 0.14f
 /** Search, sign-in and the like are laid out for a whole column, so they keep one. */
 private fun Template?.needsFullHeight() =
    this is androidx.car.app.model.SearchTemplate || this is androidx.car.app.model.signin.SignInTemplate ||
        this is androidx.car.app.model.TabTemplate || this is androidx.car.app.model.LongMessageTemplate
@@ -0,0 +1,644 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.car.app.model.GridItem
 import androidx.car.app.model.GridTemplate
 import androidx.car.app.model.Item
 import androidx.car.app.model.ItemList
 import androidx.car.app.model.ListTemplate
 import androidx.car.app.model.LongMessageTemplate
 import androidx.car.app.model.MessageTemplate
 import androidx.car.app.model.PaneTemplate
 import androidx.car.app.model.Row as CarRow
 import androidx.car.app.model.SearchTemplate
 import androidx.car.app.model.Section
 import androidx.car.app.model.SectionedItemTemplate
 import androidx.car.app.model.TabTemplate
 import androidx.car.app.model.Template
 import androidx.car.app.model.signin.InputSignInMethod
 import androidx.car.app.model.signin.PinSignInMethod
 import androidx.car.app.model.signin.ProviderSignInMethod
 import androidx.car.app.model.signin.QRCodeSignInMethod
 import androidx.car.app.model.signin.SignInTemplate
 import androidx.car.app.media.model.MediaPlaybackTemplate
 import androidx.car.app.OnDoneCallback
 import androidx.car.app.serialization.Bundleable
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.host.isDrawable
 import app.seb3thehacker.gearslip.host.inputChanged
 import app.seb3thehacker.gearslip.host.inputSubmitted
 import app.seb3thehacker.gearslip.host.submitted
 import app.seb3thehacker.gearslip.host.tabSelected
 import app.seb3thehacker.gearslip.host.text
 import app.seb3thehacker.gearslip.host.textChanged
 /**
 * Templates that fill a screen with content rather than sitting over a map.
 *
 * A map-backed template can hold one of these in its side pane, which is why they are drawn by
 * the same function either way - the only difference is how much room they get.
 */
@Composable
 fun ContentTemplate(
    template: Template?,
    modifier: Modifier = Modifier,
    autoStartPane: Boolean = false,
    ownActionsElsewhere: Boolean = false,
    tabId: String = "",
 ) {
    when (template) {
        null -> Unit
        is ListTemplate -> ListContent(template, modifier)
        is GridTemplate -> GridContent(template, modifier)
        is PaneTemplate -> PaneContent(template, modifier, autoStartPane)
        is MessageTemplate -> MessageContent(template, modifier)
        is LongMessageTemplate -> LongMessageContent(template, modifier)
        is SearchTemplate -> SearchContent(template, modifier)
        is SignInTemplate -> SignInContent(template, modifier)
        is TabTemplate -> TabContent(template, modifier)
        is SectionedItemTemplate -> SectionedContent(template, modifier, showActionsInHeader = !ownActionsElsewhere, tabId = tabId)
        is MediaPlaybackTemplate -> MediaPlaybackContent(template, modifier)
        else -> UnsupportedChrome(template, modifier)
    }
 }
 /** True when this template is one [ContentTemplate] knows how to draw. */
 fun isContentTemplate(template: Template?): Boolean = when (template) {
    is ListTemplate, is GridTemplate, is PaneTemplate, is MessageTemplate,
    is LongMessageTemplate, is SearchTemplate, is SignInTemplate, is TabTemplate,
    is SectionedItemTemplate, is MediaPlaybackTemplate,
    -> true
    else -> false
 }
 // --- lists, grids and panes ---------------------------------------------------------------------
@Composable
 private fun ListContent(template: ListTemplate, modifier: Modifier) {
    ContentSurface(modifier) {
        HeaderBar(
            headerTitle(template.header, template.title.text()),
            template.header?.startHeaderAction ?: template.headerAction,
            template.header?.endHeaderActions.orEmpty(),
            template.actionStrip,
        )
        if (template.isLoading) Loading()
        else ItemListColumn(
            template.singleList, template.sectionedLists?.map { it.itemList },
            Modifier.weight(1f, fill = false),
        )
        ActionRow(template.actions.orEmpty(), Modifier.padding(12.dp))
    }
 }
@Composable
 private fun GridContent(template: GridTemplate, modifier: Modifier) {
    ContentSurface(modifier) {
        HeaderBar(
            headerTitle(template.header, template.title.text()),
            template.header?.startHeaderAction ?: template.headerAction,
            template.header?.endHeaderActions.orEmpty(),
            template.actionStrip,
        )
        if (template.isLoading) Loading() else GridItems(template.singleList, Modifier.weight(1f, fill = false))
        ActionRow(template.actions.orEmpty(), Modifier.padding(12.dp))
    }
 }
@Composable
 private fun PaneContent(template: PaneTemplate, modifier: Modifier, autoStart: Boolean = false) {
    ContentSurface(modifier) {
        HeaderBar(
            headerTitle(template.header, template.title.text()),
            template.header?.startHeaderAction ?: template.headerAction,
            template.header?.endHeaderActions.orEmpty(),
            template.actionStrip,
        )
        if (template.pane?.isLoading == true) Loading() else PaneRows(template.pane, autoStart = autoStart)
    }
 }
 // --- messages -------------------------------------------------------------------------------
@Composable
 private fun MessageContent(template: MessageTemplate, modifier: Modifier) {
    ContentSurface(modifier) {
        // The header carries only the back arrow, not a title - a message template's own title
        // is usually the long-form question ("Would you like to download the map...") that
        // reads fine centred in the body but doesn't fit a one-line header without truncating.
        val backAction = template.header?.startHeaderAction ?: template.headerAction
        HeaderBar("", backAction, template.header?.endHeaderActions.orEmpty(), template.actionStrip)
        if (template.isLoading) {
            Loading()
            return@ContentSurface
        }
        // A back arrow already undoes this screen, so an app's own "Cancel" button would just
        // be a second way to do the one thing the header already offers.
        val actions = template.actions.orEmpty().filter { it.isDrawable() }.let { list ->
            if (backAction != null) list.filterNot { it.title.text().equals("Cancel", ignoreCase = true) } else list
        }
        Column(
            Modifier.weight(1f).fillMaxWidth().padding(24.dp),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            template.icon?.let {
                CarGlyph(it, Modifier.size(40.dp))
                Spacer(Modifier.height(12.dp))
            }
            Text(template.title.text(), style = ChromeType.title, textAlign = TextAlign.Center)
            val detail = template.message.text()
            if (detail.isNotEmpty()) {
                Spacer(Modifier.height(8.dp))
                Text(
                    detail,
                    style = ChromeType.body,
                    textAlign = TextAlign.Center,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                )
            }
            if (actions.isNotEmpty()) {
                Spacer(Modifier.height(24.dp))
                ActionRow(actions, Modifier.fillMaxWidth(0.6f), large = true)
            }
        }
    }
 }
 /**
 * The long form is the same idea with a scroll: it's what apps use for terms and conditions,
 * which is also why it is only ever shown parked.
 */
@Composable
 private fun LongMessageContent(template: LongMessageTemplate, modifier: Modifier) {
    ContentSurface(modifier) {
        HeaderBar(
            template.title.text(),
            template.headerAction,
            actionStrip = template.actionStrip,
        )
        Text(
            template.message.text(),
            style = ChromeType.body,
            modifier = Modifier
                .weight(1f)
                .verticalScroll(rememberScrollState())
                .padding(horizontal = 16.dp),
        )
        ActionRow(template.actions.orEmpty(), Modifier.padding(16.dp))
    }
 }
 // --- search ---------------------------------------------------------------------------------
 /**
 * Search: the host owns the text and the keyboard, and the app owns the results.
 *
 * Every keystroke goes to the app through [SearchTemplate.getSearchCallbackDelegate], which is
 * what lets results update as you type. The text lives here rather than in the template
 * because the app never sends it back - it only ever sends a new list of results.
 */
@Composable
 private fun SearchContent(template: SearchTemplate, modifier: Modifier) {
    // Seeded once. The app refreshes this template on every keystroke, so re-seeding from
    // initialSearchText would fight whatever is being typed.
    var query by remember { mutableStateOf(template.initialSearchText.orEmpty()) }
    val delegate = template.searchCallbackDelegate
    ContentSurface(modifier) {
        // Back button and field share a row: on a 480px screen the keyboard and the results
        // are already competing for every pixel, so the header can't have one to itself.
        Row(
            Modifier.fillMaxWidth().padding(horizontal = 10.dp, vertical = 4.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(8.dp),
        ) {
            template.headerAction?.let { ActionButton(it) }
            SearchField(
                query,
                template.searchHint.orEmpty(),
                Modifier.weight(1f),
                onClear = {
                    query = ""
                    delegate.textChanged("")
                },
            )
            ActionRow(template.actionStrip?.actions.orEmpty())
        }
        Box(Modifier.weight(1f)) {
            if (template.isLoading) Loading()
            else ItemListColumn(template.itemList, modifier = Modifier.fillMaxSize())
        }
        CarKeyboard(
            text = query,
            onTextChange = {
                query = it
                delegate.textChanged(it)
            },
            onSubmit = { delegate.submitted(query) },
        )
    }
 }
 /**
 * The field the on-screen keyboard types into. It is the same height and shape as the round
 * buttons beside it, so the header reads as one row of controls rather than a thin strip squeezed
 * between two big buttons, and it carries a magnifier so it reads as search at a glance.
 * [onClear] adds a clear button once something is typed; [searchIcon] is off for sign-in fields.
 */
@Composable
 private fun SearchField(
    query: String,
    hint: String,
    modifier: Modifier = Modifier,
    searchIcon: Boolean = true,
    onClear: (() -> Unit)? = null,
 ) {
    val muted = MaterialTheme.colorScheme.onSurfaceVariant
    Surface(
        color = MaterialTheme.colorScheme.surfaceContainerHighest,
        shape = androidx.compose.foundation.shape.CircleShape,
        modifier = modifier.fillMaxWidth().height(ICON_BUTTON_SIZE),
    ) {
        Row(
            Modifier.padding(start = if (searchIcon) 16.dp else 22.dp, end = 6.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            if (searchIcon) {
                androidx.compose.material3.Icon(
                    androidx.compose.material.icons.Icons.Filled.Search,
                    contentDescription = null,
                    tint = muted,
                    modifier = Modifier.size(26.dp),
                )
                Spacer(Modifier.width(12.dp))
            }
            Text(
                query.ifEmpty { hint.ifEmpty { "Search" } },
                style = MaterialTheme.typography.titleMedium,
                color = if (query.isEmpty()) muted else MaterialTheme.colorScheme.onSurface,
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
                modifier = Modifier.weight(1f),
            )
            if (onClear != null && query.isNotEmpty()) {
                GsIconButton(
                    androidx.compose.material.icons.Icons.Filled.Close,
                    "Clear",
                    onClear,
                    colors = GsColors(androidx.compose.ui.graphics.Color.Transparent, muted),
                    size = 42.dp,
                    iconSize = 22.dp,
                    shape = androidx.compose.foundation.shape.CircleShape,
                )
            }
        }
    }
 }
 // --- sign-in --------------------------------------------------------------------------------
 /**
 * Sign-in comes in four shapes and the host has to draw whichever the app picked. Only the
 * typed one needs the keyboard; a PIN or QR code is something the driver reads off the screen
 * and completes on their phone.
 */
@Composable
 private fun SignInContent(template: SignInTemplate, modifier: Modifier) {
    ContentSurface(modifier) {
        HeaderBar(
            template.title.text(),
            template.headerAction,
            actionStrip = template.actionStrip,
        )
        if (template.isLoading) {
            Loading()
            return@ContentSurface
        }
        val instructions = template.instructions.text()
        if (instructions.isNotEmpty()) {
            Text(
                instructions,
                style = ChromeType.body,
                modifier = Modifier.padding(horizontal = 16.dp, vertical = 6.dp),
            )
        }
        when (val method = template.signInMethod) {
            is InputSignInMethod -> InputSignIn(method, Modifier.weight(1f))
            is PinSignInMethod -> Callout(method.pinCode.toString(), Modifier.weight(1f))
            is QRCodeSignInMethod -> Callout(method.uri.toString(), Modifier.weight(1f))
            is ProviderSignInMethod -> Box(Modifier.weight(1f), Alignment.Center) {
                ActionRow(listOf(method.action))
            }
            else -> Spacer(Modifier.weight(1f))
        }
        val additional = template.additionalText.text()
        if (additional.isNotEmpty()) {
            Text(
                additional,
                style = ChromeType.label,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
                modifier = Modifier.padding(horizontal = 16.dp),
            )
        }
        ActionRow(template.actions.orEmpty(), Modifier.padding(12.dp))
    }
 }
@Composable
 private fun InputSignIn(method: InputSignInMethod, modifier: Modifier) {
    var value by remember { mutableStateOf(method.defaultValue.text()) }
    val delegate = method.inputCallbackDelegate
    val masked = method.inputType == InputSignInMethod.INPUT_TYPE_PASSWORD
    Column(modifier) {
        SearchField(if (masked) "•".repeat(value.length) else value, method.hint.text(), searchIcon = false)
        val error = method.errorMessage.text()
        if (error.isNotEmpty()) {
            Text(
                error,
                style = ChromeType.label,
                color = MaterialTheme.colorScheme.error,
                modifier = Modifier.padding(horizontal = 16.dp),
            )
        }
        Spacer(Modifier.weight(1f))
        CarKeyboard(
            text = value,
            onTextChange = {
                value = it
                delegate.inputChanged(it)
            },
            onSubmit = { delegate.inputSubmitted(value) },
            submitIcon = false,
        )
    }
 }
 /** A code the driver reads off the screen. Big, centred, nothing else competing with it. */
@Composable
 private fun Callout(value: String, modifier: Modifier) {
    Box(modifier.fillMaxWidth(), contentAlignment = Alignment.Center) {
        Text(
            value,
            style = ChromeType.headline,
            textAlign = androidx.compose.ui.text.style.TextAlign.Center,
        )
    }
 }
 // --- tabs -----------------------------------------------------------------------------------
@Composable
 private fun TabContent(template: TabTemplate, modifier: Modifier) {
    val active = template.activeTabContentId
    val innerTemplate = template.tabContents?.template
    // A sectioned tab's own actions (search, a Liked Songs shortcut) belong on the same line as
    // the tabs themselves - a real Android Auto host's header row, not a second near-empty row
    // underneath it that SectionedContent would otherwise draw just to hold them.
    val trailingActions = (innerTemplate as? SectionedItemTemplate)?.actions.orEmpty().filter { it.isDrawable() }
    Box(modifier) {
        ContentSurface(Modifier.fillMaxSize()) {
            Row(
                Modifier
                    .fillMaxWidth()
                    .padding(horizontal = 8.dp, vertical = 6.dp)
                    .verticalScrollNone(),
                horizontalArrangement = Arrangement.spacedBy(6.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                template.headerAction?.let { ActionButton(it) }
                template.tabs.forEach { tab ->
                    val selected = tab.contentId == active
                    GsIconBox(
                        onClick = { template.tabCallbackDelegate.tabSelected(tab.contentId) },
                        colors = if (selected) GsColors(MaterialTheme.colorScheme.primaryContainer, MaterialTheme.colorScheme.onPrimaryContainer)
                        else GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
                        shape = RoundedCornerShape(20.dp),
                        latched = selected,
                    ) {
                        Row(
                            Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
                            verticalAlignment = Alignment.CenterVertically,
                        ) {
                            tab.icon?.let {
                                CarGlyph(it, Modifier.size(20.dp))
                                Spacer(Modifier.width(6.dp))
                            }
                            Text(tab.title.text(), style = ChromeType.label, maxLines = 1)
                        }
                    }
                }
            }
            if (template.isLoading) Loading()
            else ContentTemplate(
                innerTemplate,
                Modifier.weight(1f),
                ownActionsElsewhere = trailingActions.isNotEmpty(),
                tabId = active.orEmpty(),
            )
        }
        // Bottom-left, not on the tab row: a driver's hand rests near the bottom of the screen,
        // and the tab row is already busy with the tabs themselves.
        if (trailingActions.isNotEmpty()) {
            Row(
                Modifier.align(Alignment.BottomStart).padding(12.dp),
                horizontalArrangement = Arrangement.spacedBy(8.dp),
            ) {
                trailingActions.forEach { ActionButton(it) }
            }
        }
    }
 }
 /** Tabs share a row; this keeps the modifier chain readable where no scroll is wanted. */
 private fun Modifier.verticalScrollNone(): Modifier = this
 // --- sectioned items --------------------------------------------------------------------------
 /**
 * A section's items ([SectionRows]) are cached for the life of the process, keyed off the
 * foreground app and, when nested under a tab, the tab - so flipping back to a shelf already
 * seen this drive is instant instead of re-asking the app over the binder. Bounded and in
 * memory only, so it costs nothing on disk and disappears with the process.
 */
 private val sectionCache = android.util.LruCache<String, List<Item>>(64)
 /**
 * Sections fetch their items across the binder on demand rather than carrying them, so each one
 * is asked for its full range once and the answer is held while the section is on screen (and,
 * via [sectionCache], for the rest of the drive).
 */
@Composable
 private fun SectionedContent(template: SectionedItemTemplate, modifier: Modifier, showActionsInHeader: Boolean = true, tabId: String = "") {
    val appPackage = CarServices.nav.appPackage.orEmpty()
    ContentSurface(modifier) {
        // The app's own actions (Spotify's search and Liked Songs shortcut, for two) come from
        // template.actions, not the header - but a bottom-of-content row is wrong for a driver
        // reaching for it. Normally the header's own end-actions slot is where a real Android
        // Auto host puts these; nested under a TabTemplate, though, TabContent already drew them
        // on the tab row itself, so showActionsInHeader is false and this header stays title-only
        // (and usually collapses to nothing, since a tab's own content carries no separate title).
        HeaderBar(
            headerTitle(template.header, ""),
            template.header?.startHeaderAction,
            template.header?.endHeaderActions.orEmpty() + if (showActionsInHeader) template.actions.orEmpty() else emptyList(),
        )
        if (template.isLoading) {
            Loading()
            return@ContentSurface
        }
        Column(Modifier.weight(1f).verticalScroll(rememberScrollState())) {
            template.sections.forEachIndexed { index, section ->
                PaneTitle(section.title.text())
                SectionRows(section, "$appPackage/$tabId/$index/${section.title.text()}")
            }
        }
    }
 }
@Composable
 private fun SectionRows(section: Section<*>, cacheKey: String) {
    var items by remember(section) { mutableStateOf(sectionCache.get(cacheKey).orEmpty()) }
    LaunchedEffect(section) {
        if (sectionCache.get(cacheKey) != null) return@LaunchedEffect
        val delegate = section.itemsDelegate
        val sizeResult = runCatching { delegate.size }
        val size = sizeResult.getOrDefault(0)
        sizeResult.onFailure { GearslipLog.w("host: section.itemsDelegate.size threw: ${it.javaClass.simpleName}: ${it.message}") }
        if (size <= 0) return@LaunchedEffect
        runCatching {
            delegate.requestItemRange(0, size - 1, object : OnDoneCallback {
                override fun onSuccess(response: Bundleable?) {
                    val value = response?.let { runCatching { it.get() }.getOrNull() }
                    @Suppress("UNCHECKED_CAST")
                    val fetched = (value as? List<Item>).orEmpty()
                    items = fetched
                    sectionCache.put(cacheKey, fetched)
                }
                override fun onFailure(response: Bundleable) =
                    GearslipLog.w("host: a section refused to hand over its items")
            })
        }.onFailure { GearslipLog.w("host: could not fetch section items: ${it.message}") }
    }
    if (items.isEmpty()) {
        val message = section.noItemsMessage.text()
        if (message.isNotEmpty()) Text(message, Modifier.padding(14.dp), style = ChromeType.body)
        return
    }
    // A section's items are homogeneous in practice - one kind or the other - but nothing in
    // the API guarantees that, so both are handled rather than assuming whichever the app
    // happened to send first.
    val rows = items.filterIsInstance<CarRow>()
    val tiles = items.filterIsInstance<GridItem>()
    rows.forEach { RowItem(it) }
    if (tiles.isNotEmpty()) {
        // A plain scrollable Row, not LazyRow: the car screen renders into a VirtualDisplay
        // Presentation rather than a normal window, and LazyRow's SubcomposeLayout measures to
        // zero height there even with an explicit size - a handful of tiles per shelf makes the
        // lost virtualization no real loss.
        Row(
            Modifier
                .fillMaxWidth()
                .horizontalScroll(rememberScrollState())
                .padding(horizontal = 8.dp, vertical = 4.dp),
            horizontalArrangement = Arrangement.spacedBy(4.dp),
        ) {
            tiles.forEach { tile -> GridTile(tile, Modifier.width(180.dp)) }
        }
    }
 }
 // --- media ----------------------------------------------------------------------------------
 /**
 * The template itself carries only a header - real Android Auto hosts draw this screen from the
 * app's MediaSession instead, which is exactly what [CarServices.media] already does for the
 * media-app launcher and the bottom bar. Reusing [NowPlayingPage] here rather than a "not
 * supported" placeholder means an app whose own now-playing template Gearslip lands on (like
 * Spotify's "Liked Songs" screen) still gets working transport controls.
 */
@Composable
 private fun MediaPlaybackContent(template: MediaPlaybackTemplate, modifier: Modifier) {
    val media = CarServices.media
    val now by media.now.collectAsState()
    ContentSurface(modifier) {
        HeaderBar(
            headerTitle(template.header, ""),
            template.header?.startHeaderAction,
            template.header?.endHeaderActions.orEmpty(),
        )
        if (now.title.isNotEmpty()) {
            NowPlayingPage(now, media, Modifier.weight(1f).fillMaxWidth())
        } else {
            Box(Modifier.weight(1f).fillMaxWidth(), contentAlignment = Alignment.Center) {
                Text(
                    "Nothing playing yet.",
                    style = ChromeType.body,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    textAlign = androidx.compose.ui.text.style.TextAlign.Center,
                )
            }
        }
    }
 }
 // --- shared ---------------------------------------------------------------------------------
@Composable
 private fun ContentSurface(modifier: Modifier, content: @Composable ColumnScopeAlias.() -> Unit) {
    ChromeSurface(modifier, shape = RoundedCornerShape(0.dp)) {
        Column(Modifier.fillMaxWidth(), content = content)
    }
 }
 private typealias ColumnScopeAlias = androidx.compose.foundation.layout.ColumnScope
@Composable
 private fun Loading() {
    Box(Modifier.fillMaxWidth().height(80.dp), contentAlignment = Alignment.Center) {
        Text("Loading…", style = ChromeType.title)
    }
 }
@@ -0,0 +1,684 @@
 package app.seb3thehacker.gearslip.car
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.material3.LocalContentColor
 import androidx.compose.ui.graphics.ColorFilter
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.foundation.Image
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Warning
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import app.seb3thehacker.gearslip.host.selected
 import app.seb3thehacker.gearslip.host.checkedChanged
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.material3.RadioButton
 import androidx.compose.material3.Switch
 import androidx.core.graphics.drawable.toBitmap
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.input.pointer.PointerEventPass
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.draw.alpha
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.car.app.model.Action
 import androidx.car.app.model.ActionStrip
 import androidx.car.app.model.CarIcon
 import androidx.car.app.model.GridItem
 import androidx.car.app.model.Header
 import androidx.car.app.model.ItemList
 import androidx.car.app.model.Pane
 import androidx.car.app.model.Row as CarRow
 import androidx.car.app.model.Template
 import app.seb3thehacker.gearslip.host.click
 import app.seb3thehacker.gearslip.host.color
 import app.seb3thehacker.gearslip.host.image
 import app.seb3thehacker.gearslip.host.isDrawable
 import app.seb3thehacker.gearslip.host.standardType
 import app.seb3thehacker.gearslip.host.text
 /**
 * The pieces every template is built from.
 *
 * The Car App Library's templates are combinations of a small set of parts - a header, an
 * action strip, a list of rows, a grid of tiles - so the host only has to decide once how each
 * part looks, and each template is then mostly an arrangement of them.
 */
 // --- surfaces and text -------------------------------------------------------------------------
 /**
 * The app keeps drawing its map across the whole surface - the visible area we report tells it
 * where to put its own markers, not where to stop painting. So anything the host lays over the
 * map is opaque, always, in the same one colour: a card that lets the map show through in places
 * reads as broken glass, not as a deliberate choice, and a driver has no way to tell which was
 * meant. There is no alpha knob here on purpose - every card, bar and strip in the template
 * chrome shares this surface, so nothing drawn over a map is ever see-through.
 */
@Composable
 internal fun ChromeSurface(
    modifier: Modifier = Modifier,
    shape: Shape = RoundedCornerShape(16.dp),
    shadowElevation: androidx.compose.ui.unit.Dp = 0.dp,
    content: @Composable () -> Unit,
 ) {
    Surface(
        shadowElevation = shadowElevation,
        color = MaterialTheme.colorScheme.surface,
        contentColor = MaterialTheme.colorScheme.onSurface,
        shape = shape,
        modifier = modifier,
        content = content,
    )
 }
 /**
 * The one type scale for everything a templated app's screen draws. Apps hand the host plain
 * strings with no size of their own - the Car App Library deliberately keeps that decision out of
 * their hands - so without a shared scale, each template's text ends up whatever size felt right
 * when that template was written, and two apps' otherwise-identical rows read as different sizes
 * of importance. Every car chrome file should reach for one of these four rather than naming a
 * Material size directly.
 */
 internal object ChromeType {
    /** The one number or word a card exists to show: distance to a turn, minutes left, a PIN. */
    val headline: androidx.compose.ui.text.TextStyle
        @Composable get() = MaterialTheme.typography.headlineMedium.copy(fontWeight = FontWeight.Bold)
    /** A row's name, a header, a manoeuvre's instruction - the line the rest is supporting. */
    val title: androidx.compose.ui.text.TextStyle
        @Composable get() = MaterialTheme.typography.titleLarge.copy(fontWeight = FontWeight.SemiBold)
    /** Supporting detail: a road, an address, a message's body, a second line under a title. */
    val body: androidx.compose.ui.text.TextStyle
        @Composable get() = MaterialTheme.typography.titleMedium
    /** The smallest text Gearslip draws over a map - still large enough to read while moving. */
    val label: androidx.compose.ui.text.TextStyle
        @Composable get() = MaterialTheme.typography.bodyLarge
 }
@Composable
 internal fun UnsupportedChrome(template: Template, modifier: Modifier = Modifier) {
    androidx.compose.foundation.layout.Box(modifier, contentAlignment = Alignment.Center) {
        ChromeSurface {
            Text(
                "${template.javaClass.simpleName} isn't drawn yet",
                Modifier.padding(16.dp),
                style = ChromeType.title,
            )
        }
    }
 }
 /**
 * A template's header: a back or app action on the left, a title, and the app's own actions on
 * the right. Templates carry this either as a [Header] or as the older title-plus-action pair.
 */
@Composable
 internal fun HeaderBar(
    title: String,
    startAction: Action? = null,
    endActions: List<Action> = emptyList(),
    actionStrip: ActionStrip? = null,
 ) {
    // Beside a map the action strip already sits at the right edge, so the header must not repeat it;
    // and an app that lists the same action in two places should still see it once.
    val onMap = LocalMapEdgeActions.current
    val end = (endActions + if (onMap != null) emptyList() else actionStrip?.actions.orEmpty())
        .filter { it.isDrawable() && (onMap == null || it.identity() !in onMap) }
        .distinctBy { it.identity() }
    if (title.isEmpty() && startAction == null && end.isEmpty()) return
    Row(
        Modifier.fillMaxWidth().padding(horizontal = 12.dp, vertical = 8.dp),
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        startAction?.takeIf { it.isDrawable() }?.let { ActionButton(it) }
        Text(
            title,
            style = ChromeType.title,
            color = MaterialTheme.colorScheme.onSurface,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
            modifier = Modifier.weight(1f),
        )
        end.forEach { ActionButton(it) }
    }
 }
 /**
 * Set inside the card beside a map to what the map's right edge already shows: the action strip is
 * drawn there rather than in the header, and the header leaves out anything the edge repeats.
 * Null anywhere else.
 */
 internal val LocalMapEdgeActions = androidx.compose.runtime.compositionLocalOf<Set<String>?> { null }
 /** What makes two actions the same button: what they do and what they look like. */
 internal fun Action.identity(): String {
    val icon = icon?.icon
    val image = if (icon != null && icon.type == androidx.core.graphics.drawable.IconCompat.TYPE_RESOURCE) {
        "${icon.resPackage}:${icon.resId}"
    } else icon?.toString().orEmpty()
    return "$type|${title.text()}|$image"
 }
 /** Reads a header whichever way the template carries it. */
 internal fun headerTitle(header: Header?, fallback: String): String =
    header?.title.text().ifEmpty { fallback }
 // --- actions ------------------------------------------------------------------------------------
 /**
 * Both strips share the right edge, where a hand reaches from the driver's seat: the app's own
 * actions in a row along the top, its map controls stacked under them. Keeping them in one
 * column is what stops them colliding on a screen only 480px tall.
 */
@Composable
 internal fun RightEdgeControls(
    actionStrip: ActionStrip?,
    mapActionStrip: ActionStrip?,
    modifier: Modifier = Modifier,
 ) {
    val actions = actionStrip?.actions.orEmpty().filter { it.isDrawable() }
    val mapActions = mapActionStrip?.actions.orEmpty().filter { it.isDrawable() }
    if (actions.isEmpty() && mapActions.isEmpty()) return
    // A template that stops offering Pan must not leave the screen stuck in pan mode.
    val hasPan = (actions + mapActions).any { it.type == Action.TYPE_PAN }
    androidx.compose.runtime.LaunchedEffect(hasPan) { if (!hasPan) CarServices.nav.setPanMode(false) }
    // Faded out when the screen has been left alone; then they are only a memory of buttons, so
    // the first touch on one wakes them rather than pressing it.
    val awake = LocalMapControlsWake.current.awake
    val pan by CarServices.nav.panMode.collectAsState()
    val visible = awake || pan
    val alpha by androidx.compose.animation.core.animateFloatAsState(
        targetValue = if (visible) 1f else 0f,
        animationSpec = androidx.compose.animation.core.tween(if (visible) 150 else 500),
        label = "mapControls",
    )
    Column(
        modifier
            .alpha(alpha)
            .let { base ->
                if (visible) base else base.pointerInput(Unit) {
                    awaitPointerEventScope {
                        while (true) {
                            awaitPointerEvent(PointerEventPass.Initial).changes.forEach { it.consume() }
                        }
                    }
                }
            },
        horizontalAlignment = Alignment.End,
        verticalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        if (actions.isNotEmpty()) {
            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                actions.forEach { ActionButton(it) }
            }
        }
        mapActions.forEach { ActionButton(it) }
    }
 }
 /** [large] is the pane's main call to action: it shares the card's full width, taller, in bigger type. */
@Composable
 internal fun ActionRow(actions: List<Action>, modifier: Modifier = Modifier, large: Boolean = false) {
    val drawable = actions.filter { it.isDrawable() }
    if (drawable.isEmpty()) return
    Row(if (large) modifier.fillMaxWidth() else modifier, horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        drawable.forEach { ActionButton(it, large = large, modifier = if (large) Modifier.weight(1f) else Modifier) }
    }
 }
 /** A row with nothing to show: no words, no picture, nothing to tap. */
 private fun CarRow.isBlank(): Boolean =
    title.text().isBlank() && texts.orEmpty().all { it.text().isBlank() } && image == null &&
        toggle == null && onClickDelegate == null && actions.orEmpty().isEmpty()
 /**
 * One look everywhere: solid, in the theme's own colors, whether the button sits on a card or over
 * the map. An app that names a color for its button (a green Start) keeps it.
 */
@Composable
 internal fun ActionButton(action: Action, large: Boolean = false, modifier: Modifier = Modifier) {
    if (action.type == Action.TYPE_APP_ICON) {
        AppIconBadge()
        return
    }
    val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
    val title = action.title.text()
    val panOn by CarServices.nav.panMode.collectAsState()
    val active = action.type == Action.TYPE_PAN && panOn
    val scheme = MaterialTheme.colorScheme
    val custom = action.backgroundColor?.type?.let { it != androidx.car.app.model.CarColor.TYPE_DEFAULT } == true
    val fallback = scheme.surfaceContainerHighest
    val background = if (active) scheme.primary else action.backgroundColor.color(dark, fallback)
    val content = when {
        active -> scheme.onPrimary
        custom -> Color.White
        else -> scheme.onSurface
    }
    val hasGlyph = action.icon != null || action.type != Action.TYPE_CUSTOM
    GsIconBox(
        onClick = {
            if (action.type == Action.TYPE_BACK) CarServices.nav.backPressed()
            else if (action.type == Action.TYPE_PAN) CarServices.nav.setPanMode(!panOn)
            else action.onClickDelegate?.click("action")
        },
        modifier = modifier,
        colors = GsColors(background, content),
        enabled = action.isEnabled,
        shape = if (title.isEmpty()) androidx.compose.foundation.shape.CircleShape else RoundedCornerShape(if (large) 28.dp else 24.dp),
        latched = active,
    ) {
        if (large && title.isNotEmpty()) {
            // The label sits dead centre on the button; the icon hangs off the left edge, so the
            // pair's uneven visual weight can't pull the words off to one side.
            androidx.compose.foundation.layout.Box(
                Modifier.fillMaxWidth().padding(horizontal = 20.dp, vertical = 18.dp),
                contentAlignment = Alignment.Center,
            ) {
                if (hasGlyph) CarGlyph(action.icon, Modifier.size(30.dp).align(Alignment.CenterStart), standardFor(action))
                Text(title, style = ChromeType.title, maxLines = 1)
            }
        } else if (title.isEmpty()) {
            // Every icon-only button - back, settings, the map's zoom and locate - is the same size.
            androidx.compose.foundation.layout.Box(Modifier.size(ICON_BUTTON_SIZE), contentAlignment = Alignment.Center) {
                if (hasGlyph) CarGlyph(action.icon, Modifier.size(ICON_BUTTON_GLYPH), standardFor(action))
            }
        } else {
            Row(
                Modifier.padding(horizontal = 18.dp, vertical = 12.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                if (hasGlyph) CarGlyph(action.icon, Modifier.size(24.dp), standardFor(action))
                if (hasGlyph) Spacer(Modifier.width(8.dp))
                Text(title, style = ChromeType.body, maxLines = 1)
            }
        }
    }
 }
 /**
 * A large action that fires on its own after five seconds, filling to show the countdown - for
 * the one button on a map-preview pane, where the app is proposing a single place or route and a
 * driver glancing at the car screen has already decided. Tapping it, same as any other button,
 * fires it at once; the fill is only ever a preview of what a touch already does.
 */
@Composable
 internal fun AutoStartButton(action: Action, modifier: Modifier = Modifier) {
    var fraction by remember(action.identity()) { mutableStateOf(0f) }
    var fired by remember(action.identity()) { mutableStateOf(false) }
    fun fire() {
        if (fired) return
        fired = true
        action.onClickDelegate.click("auto-start")
    }
    androidx.compose.runtime.LaunchedEffect(action.identity()) {
        val steps = 60
        repeat(steps) { step ->
            kotlinx.coroutines.delay(AUTO_START_MS / steps)
            fraction = (step + 1) / steps.toFloat()
        }
        fire()
    }
    val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
    val custom = action.backgroundColor?.type?.let { it != androidx.car.app.model.CarColor.TYPE_DEFAULT } == true
    val background = action.backgroundColor.color(dark, MaterialTheme.colorScheme.primary)
    val content = if (custom) Color.White else MaterialTheme.colorScheme.onPrimary
    val hasGlyph = action.icon != null
    GsIconBox(
        onClick = { fire() },
        modifier = modifier.fillMaxWidth(),
        // An unfilled track, solid, not the button's own colour dimmed with alpha - so the map
        // behind never shows through however much of the five seconds is left.
        colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, content),
        enabled = action.isEnabled,
        shape = RoundedCornerShape(28.dp),
    ) {
        androidx.compose.foundation.layout.Box {
            // The countdown itself: a plain fill sweeping left to right underneath the label.
            // matchParentSize(), not fillMaxHeight() - this Box sits beside a label Box that
            // wraps its own content, and the outer Box sizes itself to its tallest child; a
            // plain fillMaxHeight() here has nothing bounded to fill up to but the whole screen,
            // which is what was stretching the whole button that tall. matchParentSize() instead
            // takes whatever size the label ends up being, without itself voting on what that is.
            androidx.compose.foundation.layout.Box(Modifier.matchParentSize()) {
                androidx.compose.foundation.layout.Box(
                    Modifier
                        .fillMaxWidth(fraction)
                        .fillMaxHeight()
                        .background(background),
                )
            }
            androidx.compose.foundation.layout.Box(
                Modifier.fillMaxWidth().padding(horizontal = 20.dp, vertical = 16.dp),
                contentAlignment = Alignment.Center,
            ) {
                if (hasGlyph) CarGlyph(action.icon, Modifier.size(24.dp).align(Alignment.CenterStart))
                Text(
                    action.title.text().ifEmpty { "Start" },
                    style = ChromeType.title,
                    maxLines = 1,
                )
            }
        }
    }
 }
 private const val AUTO_START_MS = 5_000L
 /** The connected app's own launcher icon, which is what the app-icon action stands for. */
@Composable
 private fun AppIconBadge() {
    val context = LocalContext.current
    val pkg = CarServices.nav.appPackage
    val icon = remember(pkg) {
        pkg?.let {
            runCatching {
                context.packageManager.getApplicationIcon(it).toBitmap(96, 96).asImageBitmap()
            }.getOrNull()
        }
    } ?: return
    Image(icon, contentDescription = null, modifier = Modifier.size(36.dp).clip(RoundedCornerShape(10.dp)))
 }
 /** A standard Action carries no icon of its own - the host is expected to supply the glyph. */
 private fun standardFor(action: Action): Int? = when (action.type) {
    Action.TYPE_BACK -> CarIcon.TYPE_BACK
    Action.TYPE_PAN -> CarIcon.TYPE_PAN
    Action.TYPE_APP_ICON -> CarIcon.TYPE_APP_ICON
    ACTION_TYPE_NOW_PLAYING -> ACTION_TYPE_NOW_PLAYING
    else -> null
 }
 /**
 * The media "now playing" standard action, newer than the Car App Library we build against, so it
 * has no named constant here. Spotify puts it in its header with no icon of its own.
 */
 private const val ACTION_TYPE_NOW_PLAYING = 65542
 // --- icons ----------------------------------------------------------------------------------
 /**
 * Draws an icon the app described, falling back to our own glyph for the standard types the
 * host owns. A custom icon that fails to load leaves the space empty rather than a placeholder,
 * since a wrong glyph on a map control is worse than none.
 */
@Composable
 internal fun CarGlyph(icon: CarIcon?, modifier: Modifier = Modifier, standard: Int? = null) {
    val context = LocalContext.current
    // Off the main thread and cached per icon: loadDrawable() is a Binder round trip into the
    // app's own process for a content:// icon, plus a bitmap decode - done synchronously on the
    // composition thread for every tile on screen, that's what made a shelf of ten covers feel
    // like it was hanging rather than loading.
    val bitmapState by produceState<ImageBitmap?>(null, icon) {
        value = withContext(Dispatchers.IO) { icon.image(context) }
    }
    val bitmap = bitmapState
    if (bitmap != null) {
        // An icon that names a tint (DEFAULT included) expects the host to colour it for the
        // surface it sits on; without this a white glyph vanishes on a light theme.
        val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
        val content = LocalContentColor.current
        val white = remember(bitmap) { bitmap.isPlainWhite() }
        // Untinted white artwork is a template-app habit from dark surfaces; it is coloured like
        // text so it stays readable on a light one.
        val tint = icon?.tint?.color(dark, content) ?: content.takeIf { white }
        Image(
            bitmap, contentDescription = null, modifier = modifier,
            colorFilter = tint?.let { ColorFilter.tint(it) },
        )
        return
    }
    val vector = when (standard ?: icon.standardType) {
        CarIcon.TYPE_BACK -> Icons.Filled.ArrowBack
        CarIcon.TYPE_ALERT, CarIcon.TYPE_ERROR -> Icons.Filled.Warning
        // No four-way pan glyph in material-icons-core; this is the closest honest stand-in.
        CarIcon.TYPE_PAN -> Icons.Filled.Menu
        ACTION_TYPE_NOW_PLAYING -> MediaIcons.Equalizer
        else -> null
    } ?: return
    Icon(vector, contentDescription = null, modifier = modifier)
 }
 // --- lists, grids and panes ---------------------------------------------------------------------
@Composable
 internal fun PaneTitle(title: String) {
    if (title.isEmpty()) return
    Text(
        title,
        style = ChromeType.title,
        modifier = Modifier.padding(horizontal = 14.dp, vertical = 10.dp),
    )
 }
@Composable
 internal fun ItemListColumn(
    single: ItemList?,
    sectioned: List<ItemList>? = null,
    modifier: Modifier = Modifier,
 ) {
    val rows = buildList {
        single?.items?.filterIsInstance<CarRow>()?.let(::addAll)
        sectioned?.forEach { list -> addAll(list.items.filterIsInstance<CarRow>()) }
    }
    if (rows.isEmpty()) {
        val message = single?.noItemsMessage.text()
        if (message.isNotEmpty()) Text(message, Modifier.padding(14.dp), style = ChromeType.body)
        return
    }
    // A list the app made selectable is a single-choice list: one option chosen, shown as a radio.
    val onSelected = single?.onSelectedDelegate
    val chosen = single?.selectedIndex ?: -1
    LazyColumn(modifier, contentPadding = PaddingValues(bottom = 8.dp)) {
        itemsIndexed(rows) { index, row ->
            RowItem(row, onSelected?.let { RowSelection(index == chosen) { it.selected(index) } })
        }
    }
 }
 /** A grid of tappable tiles - what apps use for a home screen beside the map. Icons here are as
 * often a small menu glyph (Organic Maps' Search, say) as real cover art, so the tile stays
 * modest; [GridTile]'s own default is for the shelf case, where every tile is a photo. */
@Composable
 internal fun GridItems(list: ItemList?, modifier: Modifier = Modifier) {
    val items = list?.items?.filterIsInstance<GridItem>().orEmpty()
    if (items.isEmpty()) return
    LazyVerticalGrid(
        columns = GridCells.Adaptive(84.dp),
        modifier = modifier,
        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 4.dp),
        horizontalArrangement = Arrangement.spacedBy(6.dp),
        verticalArrangement = Arrangement.spacedBy(6.dp),
    ) {
        items(items) { item -> GridTile(item, iconSize = 36.dp) }
    }
 }
 /**
 * One cover-art tile: an app's own icon over a title and optional subtitle. Shared by
 * [GridItems] (a whole screen of tiles, [iconSize] scaled down there to suit a plain menu glyph)
 * and a section's horizontal shelf, which carries the same [GridItem] type but scrolls sideways
 * instead of wrapping into a grid and wants its full-size cover art.
 */
@Composable
 internal fun GridTile(item: GridItem, modifier: Modifier = Modifier, iconSize: androidx.compose.ui.unit.Dp = 144.dp) {
    Column(
        modifier
            .clickable { item.onClickDelegate.click("grid item") }
            .padding(vertical = 8.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        CarGlyph(item.image, Modifier.size(iconSize))
        Spacer(Modifier.height(6.dp))
        Text(
            item.title.text(),
            style = ChromeType.label,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
        val subtitle = item.text.text()
        if (subtitle.isNotEmpty()) {
            Text(
                subtitle,
                style = ChromeType.label,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
        }
    }
 }
 /**
 * [autoStart] is for a pane floating over a map - a place or a route the app is proposing - where
 * a single action counts itself down rather than waiting to be pressed, on the theory that a
 * driver glancing at the car screen has already decided. It never applies to more than one
 * action: a pane offering a real choice (Start vs. something else) always waits to be tapped.
 */
@Composable
 internal fun PaneRows(pane: Pane?, modifier: Modifier = Modifier, autoStart: Boolean = false) {
    // Some apps pad a pane with a row of blank strings; drawn, it is just a gap.
    val rows = pane?.rows.orEmpty().filterNot { it.isBlank() }
    val actions = pane?.actions.orEmpty().filter { it.isDrawable() }
    Column(modifier) {
        rows.forEach { RowItem(it, large = true) }
        if (autoStart && actions.size == 1) {
            AutoStartButton(actions.single(), Modifier.padding(horizontal = 14.dp, vertical = 10.dp))
        } else {
            ActionRow(actions, Modifier.padding(horizontal = 14.dp, vertical = 10.dp), large = true)
        }
    }
 }
@Composable
 internal fun RowItem(row: CarRow, selection: RowSelection? = null, large: Boolean = false) {
    val toggle = row.toggle
    // Shown at once and corrected when the app answers with its own template, so the switch
    // never lags a tap; keyed on what the app last said so its answer wins.
    var checked by remember(toggle?.isChecked) { mutableStateOf(toggle?.isChecked == true) }
    val clickable = row.isEnabled && (toggle != null || selection != null || row.onClickDelegate != null)
    Row(
        Modifier
            .fillMaxWidth()
            .let {
                if (!clickable) it else it.clickable {
                    when {
                        toggle != null -> {
                            checked = !checked
                            toggle.onCheckedChangeDelegate.checkedChanged(checked)
                        }
                        selection != null -> selection.onPick()
                        else -> row.onClickDelegate.click("row")
                    }
                }
            }
            .padding(horizontal = 14.dp, vertical = 10.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        if (selection != null) {
            RadioButton(selected = selection.selected, onClick = null)
            Spacer(Modifier.width(12.dp))
        }
        row.image?.let {
            CarGlyph(it, Modifier.size(28.dp))
            Spacer(Modifier.width(12.dp))
        }
        // large only changes how much room a row gets (more lines, a bigger icon above) - the
        // type itself is the same scale as every other row, so a pane's one row and a plain
        // list's tenth row read as the same kind of text.
        Column(Modifier.weight(1f)) {
            Text(
                row.title.text(),
                style = ChromeType.title,
                maxLines = if (large) 2 else 1,
                overflow = TextOverflow.Ellipsis,
            )
            row.texts.orEmpty().take(if (large) 3 else 2).forEach { line ->
                Text(
                    line.text(),
                    style = ChromeType.body,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    maxLines = if (large) 2 else 1,
                    overflow = TextOverflow.Ellipsis,
                )
            }
        }
        ActionRow(row.actions.orEmpty())
        if (toggle != null) {
            Spacer(Modifier.width(8.dp))
            Switch(checked = checked, onCheckedChange = null, enabled = row.isEnabled)
        }
    }
 }
 /** A row's place in a single-choice list: whether it is the chosen one, and what picking it does. */
 internal class RowSelection(val selected: Boolean, val onPick: () -> Unit)
 internal fun Color.luminanceIsDark(): Boolean =
    (red * 0.299f + green * 0.587f + blue * 0.114f) < 0.5f
 /** True for a glyph drawn entirely in white (any transparency): a mask, not a picture. */
 private fun androidx.compose.ui.graphics.ImageBitmap.isPlainWhite(): Boolean {
    val pixels = IntArray(width * height)
    readPixels(pixels)
    var seen = 0
    for (pixel in pixels) {
        val alpha = pixel ushr 24
        if (alpha < 40) continue
        seen++
        if ((pixel shr 16 and 0xFF) < 225 || (pixel shr 8 and 0xFF) < 225 || (pixel and 0xFF) < 225) return false
    }
    return seen > 0
 }
 internal val ICON_BUTTON_SIZE = 54.dp
 private val ICON_BUTTON_GLYPH = 30.dp
@@ -0,0 +1,69 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 /**
 * Everything the head unit's sensor channel is willing to send, live and unfiltered - see
 * [CarSensors] for why the labels are a best guess and the raw field dump next to each one is
 * the part to actually trust while confirming what this unit really sends.
 */
@Composable
 fun VehicleDataScreen() {
    val readings by CarSensors.readings.collectAsState()
    Column(Modifier.fillMaxSize().padding(horizontal = 24.dp, vertical = 16.dp)) {
        Text("Vehicle data", style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold)
        Text(
            "Raw sensor channel from the connected head unit. Field meaning is a best guess - " +
                "watch a row change while you do the thing (brake, drive, headlights) to confirm it.",
            style = MaterialTheme.typography.bodyMedium,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
            modifier = Modifier.padding(top = 4.dp, bottom = 16.dp),
        )
        if (readings.isEmpty()) {
            Text(
                "No sensor service advertised by this head unit, or not connected.",
                style = MaterialTheme.typography.bodyLarge,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
            return@Column
        }
        LazyColumn(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            items(readings, key = { it.typeId }) { reading -> ReadingRow(reading) }
        }
    }
 }
@Composable
 private fun ReadingRow(reading: CarSensors.Reading) {
    Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
        Column(Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 12.dp)) {
            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                Text(reading.typeName, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold)
            }
            Text(
                reading.raw,
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
        }
    }
 }
@@ -0,0 +1,383 @@
 package app.seb3thehacker.gearslip.car
 import android.content.Context
 import android.os.Handler
 import android.os.Looper
 import android.os.SystemClock
 import androidx.car.app.navigation.model.NavigationTemplate
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.call.CallUiState
 import app.seb3thehacker.gearslip.call.CarCalls
 import app.seb3thehacker.gearslip.host.clockTime
 import app.seb3thehacker.gearslip.host.remainingTime
 import app.seb3thehacker.gearslip.notify.CarNotification
 import app.seb3thehacker.gearslip.notify.CarNotifications
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 /**
 * Messages by voice, the way Android Auto does it: a message is read aloud, "Do you want to
 * reply?", a yes gets "Go ahead", the reply is read back, and it sends after a few seconds unless
 * cancelled. Reply does the same; only once the message has just been read does it skip straight
 * to "What's your reply?". While the reply counts down, saying "cancel" or "change it" stops it or
 * starts it again. A quick reply sends a ready-made answer with no voice at all. Listening and speaking
 * go through [CarAssistant], so this hears through the same microphone and recognizer.
 *
 * Every step runs on the main thread. Each run gets a new [run] number, and callbacks from an
 * older run are dropped, so a cancel can never be undone by a late recognizer result.
 */
 object VoiceReply {
    enum class Phase {
        IDLE,
        /** Reading the message aloud. */
        READING,
        /** Read; the Reply button stays up for a moment in case the driver wants it. */
        READ,
        /** Asking "Do you want to reply?" and listening for a yes. */
        OFFERING,
        /** Saying "What's your reply?". */
        ASKING,
        LISTENING,
        /**
         * Reading the reply back, then counting down to [State.until] while listening for
         * "cancel" or "change it". [State.until] is 0 while the countdown is held.
         */
        CONFIRMING,
        SENT,
        ERROR,
    }
    data class State(
        val phase: Phase = Phase.IDLE,
        val target: CarNotification? = null,
        val heard: String = "",
        val error: String = "",
        /**
         * Uptime at which this step ends on its own (the card goes, or the reply sends), and how
         * long the step was given, for the card's bar. 0 when nothing is timed.
         */
        val until: Long = 0L,
        val span: Long = 0L,
        /** While a countdown is held, how much of its bar was left, so the bar stays put. */
        val held: Float = 0f,
    )
    const val SEND_DELAY_MS = 5_000L
    private const val LINGER_MS = 5_000L
    private const val SENT_MS = 2_000L
    private val _state = MutableStateFlow(State())
    val state: StateFlow<State> = _state
    private val main = Handler(Looper.getMainLooper())
    private var appContext: Context? = null
    private var run = 0
    fun init(context: Context) { appContext = context.applicationContext }
    val active: Boolean get() = _state.value.phase != Phase.IDLE
    /** Reads [n]'s newest messages aloud. */
    fun read(n: CarNotification) {
        val id = begin(State(Phase.READING, n))
        CarAssistant.say(spoken(n)) {
            if (id != run) return@say
            when {
                n.reply == null -> finish()
                // The microphone is silent during a call, so there's no point asking.
                CarCalls.state.value is CallUiState.Active -> idleAfterRead(id)
                else -> offer(id)
            }
        }
    }
    /**
     * "Do you want to reply?" A yes goes on to the reply; anything else ends quietly. The bar runs
     * while it listens, so the card never looks stuck, and holds once the driver starts talking.
     */
    private fun offer(id: Int) {
        _state.value = _state.value.copy(phase = Phase.OFFERING, heard = "", until = 0L, span = 0L, held = 0f)
        CarAssistant.say("Do you want to reply?") {
            if (id != run) return@say
            val until = SystemClock.uptimeMillis() + OFFER_MS
            _state.value = _state.value.copy(until = until, span = OFFER_MS)
            // The recognizer gives up on its own; this only covers one that doesn't.
            main.postAtTime({ if (id == run && _state.value.until != 0L) cancel() }, until + OFFER_GRACE_MS)
            CarAssistant.dictate(
                onPartial = { text -> if (id == run) _state.value = _state.value.copy(heard = text) },
                onSpeaking = {
                    if (id != run) return@dictate
                    val s = _state.value
                    val left = ((s.until - SystemClock.uptimeMillis()).toFloat() / s.span).coerceIn(0.05f, 1f)
                    _state.value = s.copy(until = 0L, span = 0L, held = left)
                },
                onResult = { text ->
                    if (id != run) return@dictate
                    if (isYes(text)) {
                        _state.value = _state.value.copy(phase = Phase.ASKING, heard = "", until = 0L, span = 0L, held = 0f)
                        CarAssistant.say("Go ahead.") { if (id == run) listen(id) }
                    } else {
                        finish()
                    }
                },
                // No answer: the card has already offered Reply and the quick replies all along.
                onError = { if (id == run) finish() },
            )
        }
    }
    private fun idleAfterRead(id: Int) {
        _state.value = _state.value.copy(phase = Phase.READ, heard = "")
        lingerThenIdle(id)
    }
    private fun isYes(text: String): Boolean {
        val words = words(text)
        if (words.any { it in NO_WORDS }) return false
        return words.any { it in YES_WORDS }
    }
    /**
     * Reads [n] aloud and asks whether to reply, or, when the driver has just heard it, asks for
     * the reply straight away. Then listens, reads the reply back and sends it.
     */
    fun reply(n: CarNotification, readFirst: Boolean = true) {
        if (n.reply == null) {
            val id = begin(State(Phase.ERROR, n, error = "${n.appLabel} doesn't allow replies from the car."))
            lingerThenIdle(id)
            return
        }
        // Android hands every app but the dialer a silent microphone during a call.
        if (CarCalls.state.value is CallUiState.Active) {
            val id = begin(State(Phase.ERROR, n, error = "Voice reply works once the call ends."))
            lingerThenIdle(id)
            return
        }
        if (!readFirst) {
            val id = begin(State(Phase.ASKING, n))
            ask(id)
            return
        }
        // Read it, then "Do you want to reply?", the same as Read.
        read(n)
    }
    private fun ask(id: Int) {
        CarAssistant.say("What's your reply?") {
            if (id == run) listen(id)
        }
    }
    private fun listen(id: Int) {
        _state.value = _state.value.copy(phase = Phase.LISTENING, heard = "")
        CarAssistant.dictate(
            onPartial = { text -> if (id == run) _state.value = _state.value.copy(heard = text) },
            onResult = { text -> if (id == run) confirm(id, text) },
            onError = { message ->
                if (id != run) return@dictate
                _state.value = _state.value.copy(phase = Phase.ERROR, error = message)
                lingerThenIdle(id)
            },
        )
    }
    private fun confirm(id: Int, text: String) {
        _state.value = _state.value.copy(phase = Phase.CONFIRMING, heard = text, until = 0L, span = 0L, held = 0f)
        // The countdown starts once the driver has heard the whole reply, not while it's read out.
        CarAssistant.say("Sending: $text") {
            if (id != run) return@say
            startCountdown(id, SEND_DELAY_MS)
            // A moment for the read-back to finish playing in the car before the microphone opens.
            main.postDelayed({ if (id == run) listenForCommand(id) }, ECHO_MS)
        }
    }
    /**
     * Sends in [ms]. After a hold the bar carries on from where it stopped instead of jumping back
     * to full: the span is stretched so the bar still runs out exactly at [ms].
     */
    private fun startCountdown(id: Int, ms: Long) {
        val sendAt = SystemClock.uptimeMillis() + ms
        val held = _state.value.held
        val span = if (held > 0f) (ms / held).toLong() else ms
        _state.value = _state.value.copy(until = sendAt, span = span, held = 0f)
        main.removeCallbacksAndMessages(SEND_TOKEN)
        main.postAtTime({ if (id == run) send() }, SEND_TOKEN, sendAt)
    }
    /**
     * Listens through the countdown for "cancel", "change it" or "send". The countdown holds from
     * the first word, so a reply can't go out while the driver is still saying "cancel".
     */
    private fun listenForCommand(id: Int) {
        CarAssistant.dictate(
            onPartial = {},
            cue = false,
            onSpeaking = {
                if (id != run) return@dictate
                main.removeCallbacksAndMessages(SEND_TOKEN)
                val s = _state.value
                val left = if (s.until > 0L && s.span > 0L) {
                    ((s.until - SystemClock.uptimeMillis()).toFloat() / s.span).coerceIn(0.05f, 1f)
                } else {
                    s.held
                }
                _state.value = s.copy(until = 0L, span = 0L, held = left)
            },
            onResult = { text ->
                if (id != run) return@dictate
                when (command(text)) {
                    Command.CANCEL -> {
                        finish()
                        CarAssistant.say("Not sent.") {}
                    }
                    Command.CHANGE -> {
                        main.removeCallbacksAndMessages(SEND_TOKEN)
                        _state.value = _state.value.copy(phase = Phase.ASKING, heard = "", until = 0L, span = 0L, held = 0f)
                        ask(id)
                    }
                    Command.SEND -> send()
                    // Talk that wasn't meant for us, a passenger or the radio: carry on counting.
                    null -> startCountdown(id, RESUME_MS)
                }
            },
            onError = { if (id == run && _state.value.until == 0L) startCountdown(id, RESUME_MS) },
        )
    }
    private enum class Command { CANCEL, CHANGE, SEND }
    private fun command(text: String): Command? {
        val words = words(text)
        return when {
            words.any { it in CANCEL_WORDS } -> Command.CANCEL
            words.any { it in CHANGE_WORDS } -> Command.CHANGE
            words.any { it in SEND_WORDS } -> Command.SEND
            else -> null
        }
    }
    private fun words(text: String) = text.lowercase().split(Regex("[^a-z']+")).filter { it.isNotEmpty() }
    /**
     * Ready-made replies for a tap instead of a voice reply. The first gives the arrival time when
     * the map is following a route.
     */
    fun quickReplies(): List<String> = listOfNotNull(etaReply(), "Driving, I'll reply soon.", "On my way.")
    private fun etaReply(): String? {
        val estimate = (CarServices.nav.template.value as? NavigationTemplate)?.destinationTravelEstimate ?: return null
        val at = estimate.arrivalTimeAtDestination.clockTime()
        val left = remainingTime(estimate.remainingTimeSeconds)
        return when {
            at.isNotEmpty() -> "Driving, I'll be there around $at."
            left.isNotEmpty() -> "Driving, I'll be there in about $left."
            else -> null
        }
    }
    /** Sends [text] to [n] straight away, as if it had been said and confirmed. */
    fun quickReply(n: CarNotification, text: String) {
        if (n.reply == null) return
        begin(State(Phase.CONFIRMING, n, heard = text))
        send()
    }
    /** Sends a reply that's counting down, without waiting for the rest of it. */
    fun sendNow() {
        if (_state.value.phase == Phase.CONFIRMING) send()
    }
    private fun send() {
        val s = _state.value
        val n = s.target ?: return finish()
        val context = appContext ?: return finish()
        val id = ++run
        CarAssistant.stopListening()
        CarAssistant.stopSpeaking()
        if (CarNotifications.reply(context, n, s.heard.trim())) {
            GearslipLog.i("voice reply: sent to ${n.appLabel}")
            CarAssistant.say("Message sent.") {}
            CarNotifications.dismissPopup(n.id)
            _state.value = s.copy(phase = Phase.SENT, until = SystemClock.uptimeMillis() + SENT_MS, span = SENT_MS, held = 0f)
            main.postDelayed({ if (id == run) finish() }, SENT_MS)
        } else {
            _state.value = s.copy(phase = Phase.ERROR, error = "${n.appLabel} withdrew the reply. Open the app on the phone to answer.")
            lingerThenIdle(id)
        }
    }
    /** Stops wherever it is. Nothing is sent. */
    fun cancel() {
        if (!active) return
        CarAssistant.stopListening()
        CarAssistant.stopSpeaking()
        finish()
    }
    /**
     * The steering wheel's voice key. With a message on screen it answers that message, and
     * during a countdown it sends straight away. Returns false when there's nothing to answer, so
     * the key can start the assistant instead.
     */
    fun onVoiceKey(): Boolean {
        val s = _state.value
        when (s.phase) {
            // Already heard, so straight to the reply.
            Phase.READ, Phase.READING, Phase.OFFERING, Phase.ERROR -> s.target?.let { reply(it, readFirst = false); return true }
            Phase.CONFIRMING -> { sendNow(); return true }
            Phase.ASKING, Phase.LISTENING, Phase.SENT -> return true
            Phase.IDLE -> Unit
        }
        val popup = CarNotifications.popup.value ?: return false
        if (popup.reply == null) return false
        reply(popup)
        return true
    }
    private fun begin(state: State): Int {
        CarAssistant.stopListening()
        CarAssistant.stopSpeaking()
        main.removeCallbacksAndMessages(null)
        _state.value = state
        return ++run
    }
    private fun lingerThenIdle(id: Int) {
        _state.value = _state.value.copy(until = SystemClock.uptimeMillis() + LINGER_MS, span = LINGER_MS, held = 0f)
        main.postDelayed({ if (id == run) finish() }, LINGER_MS)
    }
    private fun finish() {
        run++
        main.removeCallbacksAndMessages(null)
        _state.value = State()
    }
    /** "Alex says: ..." or, in a group, "Sam in Climbing says: ...", for the newest messages. */
    private fun spoken(n: CarNotification): String {
        val from = n.title.ifBlank { n.appLabel }
        val lines = n.lines.filter { it.sender != null }.takeLast(n.burst.coerceIn(1, MAX_READ))
        if (lines.isEmpty()) return "$from says: ${n.text}"
        return lines.joinToString(". ") { line ->
            val who = if (n.isGroup) "${line.sender} in $from" else from
            "$who says: ${line.text}"
        }
    }
    private const val MAX_READ = 3
    private val YES_WORDS = setOf("yes", "yeah", "yep", "yup", "sure", "ok", "okay", "reply", "please")
    private val NO_WORDS = setOf("no", "nope", "nah", "cancel", "don't", "stop")
    private val CANCEL_WORDS = setOf("cancel", "stop", "don't", "no", "nope")
    private val CHANGE_WORDS = setOf("change", "redo", "again", "edit", "wrong", "fix")
    private val SEND_WORDS = setOf("send", "yes", "yeah", "ok", "okay", "go")
    private val SEND_TOKEN = Any()
    private const val ECHO_MS = 300L
    /** How long "Do you want to reply?" waits for an answer: the start beep, then the engine's silence limit. */
    private const val OFFER_MS = 6_500L
    private const val OFFER_GRACE_MS = 1_500L
    /** After talk that wasn't a command, the reply waits this long again before it goes. */
    private const val RESUME_MS = 3_000L
 }
@@ -0,0 +1,213 @@
 package app.seb3thehacker.gearslip.car
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
 import android.location.Geocoder
 import android.location.Location
 import android.location.LocationManager
 import app.seb3thehacker.gearslip.GearslipLog
 import java.net.HttpURLConnection
 import java.net.URL
 import java.util.Locale
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import org.json.JSONObject
 class HourForecast(val time: Long, val temp: Int, val code: Int, val isDay: Boolean, val rainChance: Int)
 class DayForecast(val date: Long, val high: Int, val low: Int, val code: Int, val rainChance: Int)
 class WeatherData(
    val place: String,
    val temp: Int,
    val feelsLike: Int,
    val code: Int,
    val isDay: Boolean,
    val humidity: Int,
    val wind: Int,
    val tempUnit: String,
    val windUnit: String,
    val hours: List<HourForecast>,
    val days: List<DayForecast>,
    val fetchedAt: Long,
 )
 sealed interface WeatherState {
    data object Loading : WeatherState
    data class Unavailable(val reason: String) : WeatherState
    data class Ready(val data: WeatherData) : WeatherState
 }
 /**
 * Current weather and a week's forecast for wherever the phone is, from Open-Meteo (free, no
 * key or account; the data is CC BY 4.0, so the weather screen credits it).
 *
 * The location is the phone's last fix if it is recent, otherwise a fresh one is requested, so
 * a phone that has been idle does not leave the card on "unavailable".
 */
 object Weather {
    private const val TTL_MS = 30 * 60 * 1000L
    private const val FIX_MAX_AGE_MS = 30 * 60 * 1000L
    private const val FIX_TIMEOUT_S = 12L
    private val flow = MutableStateFlow<WeatherState>(WeatherState.Loading)
    val state: StateFlow<WeatherState> = flow
    private val io = Executors.newSingleThreadExecutor { Thread(it, "gearslip-weather").apply { isDaemon = true } }
    private var placeCache: Pair<String, String>? = null // rounded "lat,lon" to place name
    /** Runs off the main thread. Fresh data younger than [TTL_MS] is kept unless [force]. */
    fun refresh(context: Context, force: Boolean = false) {
        val current = flow.value
        if (!force && current is WeatherState.Ready && System.currentTimeMillis() - current.data.fetchedAt < TTL_MS) return
        val app = context.applicationContext
        io.execute { load(app) }
    }
    @Synchronized
    private fun load(context: Context) {
        // Keep showing the old reading while a new one loads; only the first load shows a spinner.
        val location = locate(context)
        if (location == null) {
            if (flow.value !is WeatherState.Ready) {
                val allowed = hasLocationPermission(context)
                flow.value = WeatherState.Unavailable(
                    if (allowed) "Waiting for a location fix." else "Allow location for Gearslip on the phone to see the weather.",
                )
            }
            return
        }
        val data = runCatching { fetch(context, location) }
            .onFailure { GearslipLog.w("weather fetch failed: ${it.message}") }
            .getOrNull()
        if (data != null) {
            flow.value = WeatherState.Ready(data)
            GearslipLog.i("weather: ${data.place} ${data.temp}${data.tempUnit} ${describe(data.code)}")
        }
        else if (flow.value !is WeatherState.Ready) flow.value = WeatherState.Unavailable("Could not reach the weather service.")
    }
    // --- location -------------------------------------------------------------------------
    private fun hasLocationPermission(context: Context) =
        context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ||
            context.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
    private fun locate(context: Context): Location? {
        if (!hasLocationPermission(context)) return null
        val manager = context.getSystemService(LocationManager::class.java) ?: return null
        val known = manager.allProviders
            .mapNotNull { runCatching { manager.getLastKnownLocation(it) }.getOrNull() }
            .maxByOrNull { it.time }
        if (known != null && System.currentTimeMillis() - known.time < FIX_MAX_AGE_MS) return known
        val provider = listOf(LocationManager.FUSED_PROVIDER, LocationManager.NETWORK_PROVIDER, LocationManager.GPS_PROVIDER)
            .firstOrNull { it in manager.allProviders && manager.isProviderEnabled(it) }
            ?: return known
        val latch = CountDownLatch(1)
        var fresh: Location? = null
        runCatching {
            manager.getCurrentLocation(provider, null, io) { fresh = it; latch.countDown() }
            latch.await(FIX_TIMEOUT_S, TimeUnit.SECONDS)
        }.onFailure { GearslipLog.w("weather: fresh fix failed: ${it.message}") }
        // A stale fix still gives the right city, which is all a forecast needs.
        return fresh ?: known
    }
    private fun placeName(context: Context, location: Location): String {
        val key = "%.2f,%.2f".format(Locale.US, location.latitude, location.longitude)
        placeCache?.let { if (it.first == key) return it.second }
        val name = runCatching {
            if (!Geocoder.isPresent()) return@runCatching null
            @Suppress("DEPRECATION")
            Geocoder(context, Locale.getDefault()).getFromLocation(location.latitude, location.longitude, 1)
                ?.firstOrNull()?.let { it.locality ?: it.subAdminArea ?: it.adminArea }
        }.getOrNull() ?: "%.2f, %.2f".format(Locale.US, location.latitude, location.longitude)
        placeCache = key to name
        return name
    }
    // --- network --------------------------------------------------------------------------
    private fun fetch(context: Context, location: Location): WeatherData {
        val imperial = CarSettings.imperial()
        val url = URL(
            "https://api.open-meteo.com/v1/forecast?latitude=${location.latitude}&longitude=${location.longitude}" +
                "&current=temperature_2m,apparent_temperature,relative_humidity_2m,weather_code,wind_speed_10m,is_day" +
                "&hourly=temperature_2m,weather_code,precipitation_probability,is_day" +
                "&daily=weather_code,temperature_2m_max,temperature_2m_min,precipitation_probability_max" +
                "&timezone=auto&timeformat=unixtime&forecast_days=7" +
                if (imperial) "&temperature_unit=fahrenheit&wind_speed_unit=mph" else "",
        )
        val body = (url.openConnection() as HttpURLConnection).run {
            connectTimeout = 6_000
            readTimeout = 8_000
            inputStream.bufferedReader().use { it.readText() }
        }
        val json = JSONObject(body)
        val cur = json.getJSONObject("current")
        val hourly = json.getJSONObject("hourly")
        val times = hourly.getJSONArray("time")
        val nowSec = System.currentTimeMillis() / 1000
        val start = (0 until times.length()).firstOrNull { times.getLong(it) >= nowSec - 3600 } ?: 0
        val hours = (start until minOf(start + 12, times.length())).map { i ->
            HourForecast(
                time = times.getLong(i) * 1000,
                temp = Math.round(hourly.getJSONArray("temperature_2m").getDouble(i)).toInt(),
                code = hourly.getJSONArray("weather_code").getInt(i),
                isDay = hourly.getJSONArray("is_day").getInt(i) == 1,
                rainChance = hourly.getJSONArray("precipitation_probability").optInt(i, 0),
            )
        }
        val daily = json.getJSONObject("daily")
        val dates = daily.getJSONArray("time")
        val days = (0 until dates.length()).map { i ->
            DayForecast(
                date = dates.getLong(i) * 1000,
                high = Math.round(daily.getJSONArray("temperature_2m_max").getDouble(i)).toInt(),
                low = Math.round(daily.getJSONArray("temperature_2m_min").getDouble(i)).toInt(),
                code = daily.getJSONArray("weather_code").getInt(i),
                rainChance = daily.getJSONArray("precipitation_probability_max").optInt(i, 0),
            )
        }
        return WeatherData(
            place = placeName(context, location),
            temp = Math.round(cur.getDouble("temperature_2m")).toInt(),
            feelsLike = Math.round(cur.getDouble("apparent_temperature")).toInt(),
            code = cur.getInt("weather_code"),
            isDay = cur.getInt("is_day") == 1,
            humidity = cur.getInt("relative_humidity_2m"),
            wind = Math.round(cur.getDouble("wind_speed_10m")).toInt(),
            tempUnit = if (imperial) "°F" else "°C",
            windUnit = if (imperial) "mph" else "km/h",
            hours = hours,
            days = days,
            fetchedAt = System.currentTimeMillis(),
        )
    }
    /** Open-Meteo's WMO weather codes, in words. */
    fun describe(code: Int): String = when (code) {
        0 -> "Clear"
        1 -> "Mostly clear"
        2 -> "Partly cloudy"
        3 -> "Overcast"
        45, 48 -> "Fog"
        in 51..57 -> "Drizzle"
        in 61..67 -> "Rain"
        in 71..77 -> "Snow"
        in 80..82 -> "Rain showers"
        in 85..86 -> "Snow showers"
        in 95..99 -> "Thunderstorm"
        else -> "-"
    }
 }
@@ -0,0 +1,101 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.layout.size
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Path
 import androidx.compose.ui.graphics.StrokeCap
 import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.drawscope.Stroke
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import kotlin.math.cos
 import kotlin.math.sin
 private val SUN = Color(0xFFFFB300)
 private val MOON = Color(0xFFCFD8DC)
 private val CLOUD = Color(0xFF90A4AE)
 private val RAIN = Color(0xFF29B6F6)
 private val SNOW = Color(0xFF81D4FA)
 private val BOLT = Color(0xFFFFD54F)
 /** Sun, moon, cloud, rain, snow, storm or fog for a WMO weather code. Drawn, so it needs no icon pack. */
@Composable
 fun WeatherIcon(code: Int, isDay: Boolean, size: Dp = 28.dp, modifier: Modifier = Modifier) {
    Canvas(modifier.size(size)) {
        when (code) {
            0 -> if (isDay) sun(center, this.size.minDimension * 0.5f) else moon(center, this.size.minDimension * 0.5f)
            1, 2 -> {
                if (isDay) sun(Offset(this.size.width * 0.38f, this.size.height * 0.36f), this.size.minDimension * 0.36f)
                else moon(Offset(this.size.width * 0.38f, this.size.height * 0.36f), this.size.minDimension * 0.36f)
                cloud(Offset(this.size.width * 0.06f, this.size.height * 0.34f), Size(this.size.width * 0.9f, this.size.height * 0.6f))
            }
            3 -> cloud(Offset(0f, this.size.height * 0.2f), Size(this.size.width, this.size.height * 0.7f))
            45, 48 -> fog()
            in 71..77, in 85..86 -> precip(SNOW, dots = true)
            in 95..99 -> storm()
            else -> precip(RAIN, dots = false)
        }
    }
 }
 private fun DrawScope.sun(c: Offset, r: Float) {
    drawCircle(SUN, r * 0.55f, c)
    val stroke = r * 0.14f
    for (i in 0 until 8) {
        val a = Math.toRadians(i * 45.0)
        drawLine(
            SUN, c + Offset(cos(a).toFloat(), sin(a).toFloat()) * (r * 0.75f),
            c + Offset(cos(a).toFloat(), sin(a).toFloat()) * r, stroke, StrokeCap.Round,
        )
    }
 }
 private fun DrawScope.moon(c: Offset, r: Float) {
    val disc = Path().apply { addOval(androidx.compose.ui.geometry.Rect(c, r * 0.62f)) }
    val bite = Path().apply { addOval(androidx.compose.ui.geometry.Rect(c + Offset(r * 0.32f, -r * 0.22f), r * 0.55f)) }
    drawPath(Path.combine(androidx.compose.ui.graphics.PathOperation.Difference, disc, bite), MOON)
 }
 private fun DrawScope.cloud(topLeft: Offset, s: Size) {
    val h = s.height
    drawCircle(CLOUD, h * 0.42f, topLeft + Offset(s.width * 0.3f, h * 0.55f))
    drawCircle(CLOUD, h * 0.55f, topLeft + Offset(s.width * 0.55f, h * 0.42f))
    drawCircle(CLOUD, h * 0.38f, topLeft + Offset(s.width * 0.78f, h * 0.62f))
    drawRoundRect(CLOUD, topLeft + Offset(s.width * 0.28f, h * 0.55f), Size(s.width * 0.52f, h * 0.45f),
        androidx.compose.ui.geometry.CornerRadius(h * 0.2f))
 }
 private fun DrawScope.precip(color: Color, dots: Boolean) {
    cloud(Offset(0f, 0f), Size(size.width, size.height * 0.62f))
    for (i in 0 until 3) {
        val x = size.width * (0.28f + 0.22f * i)
        val y = size.height * 0.72f
        if (dots) drawCircle(color, size.width * 0.045f, Offset(x, y + size.height * 0.08f))
        else drawLine(color, Offset(x, y), Offset(x - size.width * 0.06f, y + size.height * 0.2f), size.width * 0.07f, StrokeCap.Round)
    }
 }
 private fun DrawScope.storm() {
    cloud(Offset(0f, 0f), Size(size.width, size.height * 0.62f))
    val w = size.width
    val h = size.height
    val bolt = Path().apply {
        moveTo(w * 0.55f, h * 0.55f); lineTo(w * 0.36f, h * 0.82f); lineTo(w * 0.5f, h * 0.82f)
        lineTo(w * 0.42f, h * 1f); lineTo(w * 0.66f, h * 0.7f); lineTo(w * 0.52f, h * 0.7f); close()
    }
    drawPath(bolt, BOLT)
 }
 private fun DrawScope.fog() {
    val stroke = Stroke(width = size.height * 0.09f, cap = StrokeCap.Round)
    for (i in 0 until 4) {
        val y = size.height * (0.25f + 0.17f * i)
        val inset = if (i % 2 == 0) 0.1f else 0.2f
        drawLine(CLOUD, Offset(size.width * inset, y), Offset(size.width * (1f - inset), y), stroke.width, stroke.cap)
    }
 }
@@ -0,0 +1,128 @@
 package app.seb3thehacker.gearslip.car
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import java.text.DateFormat
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 /** The weather in full: now, the next twelve hours and the week. Opened from the nav bar or the dashboard. */
@Composable
 fun WeatherScreen() {
    val context = LocalContext.current.applicationContext
    val state by Weather.state.collectAsState()
    LaunchedEffect(Unit) { Weather.refresh(context) }
    Column(
        Modifier.fillMaxSize().verticalScroll(rememberScrollState()).padding(horizontal = 24.dp, vertical = 16.dp),
        verticalArrangement = Arrangement.spacedBy(20.dp),
    ) {
        when (val s = state) {
            WeatherState.Loading -> Text("Getting the weather…", style = MaterialTheme.typography.titleMedium)
            is WeatherState.Unavailable -> Text(
                s.reason, style = MaterialTheme.typography.titleMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
            )
            is WeatherState.Ready -> Forecast(s.data)
        }
    }
 }
@Composable
 private fun Forecast(w: WeatherData) {
    Text(w.place, style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold)
    Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.extraLarge) {
        Row(
            Modifier.fillMaxWidth().padding(24.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(24.dp),
        ) {
            WeatherIcon(w.code, w.isDay, size = 88.dp)
            Column {
                Text("${w.temp}${w.tempUnit}", fontSize = 56.sp, fontWeight = FontWeight.Bold)
                Text(Weather.describe(w.code), style = MaterialTheme.typography.titleLarge)
            }
            Spacer(Modifier.weight(1f))
            Column(horizontalAlignment = Alignment.End, verticalArrangement = Arrangement.spacedBy(4.dp)) {
                Text("Feels like ${w.feelsLike}${w.tempUnit}", style = MaterialTheme.typography.bodyLarge)
                Text("Humidity ${w.humidity}%", style = MaterialTheme.typography.bodyLarge)
                Text("Wind ${w.wind} ${w.windUnit}", style = MaterialTheme.typography.bodyLarge)
            }
        }
    }
    Text("Next hours", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
    LazyRow(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
        items(w.hours) { h ->
            Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
                Column(
                    Modifier.width(84.dp).padding(vertical = 12.dp),
                    horizontalAlignment = Alignment.CenterHorizontally,
                    verticalArrangement = Arrangement.spacedBy(6.dp),
                ) {
                    Text(
                        DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(h.time)).replace(":00", ""),
                        style = MaterialTheme.typography.labelLarge,
                    )
                    WeatherIcon(h.code, h.isDay, size = 32.dp)
                    Text("${h.temp}°", style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold)
                    Text(
                        if (h.rainChance > 0) "${h.rainChance}%" else " ",
                        style = MaterialTheme.typography.labelSmall, color = MaterialTheme.colorScheme.primary,
                    )
                }
            }
        }
    }
    Text("This week", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        w.days.forEachIndexed { i, d ->
            Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
                Row(
                    Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 10.dp),
                    verticalAlignment = Alignment.CenterVertically,
                    horizontalArrangement = Arrangement.spacedBy(16.dp),
                ) {
                    Text(
                        if (i == 0) "Today" else SimpleDateFormat("EEEE", Locale.getDefault()).format(Date(d.date)),
                        Modifier.width(120.dp), style = MaterialTheme.typography.bodyLarge, fontWeight = FontWeight.SemiBold,
                    )
                    WeatherIcon(d.code, true, size = 28.dp)
                    Text(Weather.describe(d.code), Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
                    if (d.rainChance > 0) Text("${d.rainChance}%", color = MaterialTheme.colorScheme.primary)
                    Text("${d.low}° / ${d.high}°", style = MaterialTheme.typography.bodyLarge)
                }
            }
        }
    }
    Text(
        "Weather data by Open-Meteo.com (CC BY 4.0)",
        style = MaterialTheme.typography.labelSmall, color = MaterialTheme.colorScheme.onSurfaceVariant,
    )
 }
@@ -0,0 +1,188 @@
 package app.seb3thehacker.gearslip.car
 import android.os.Handler
 import android.os.Looper
 import android.webkit.JavascriptInterface
 import android.webkit.WebResourceError
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
 import android.webkit.WebView
 import android.webkit.WebViewClient
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.viewinterop.AndroidView
 import app.seb3thehacker.gearslip.GearslipLog
 import org.json.JSONObject
 /**
 * A browser inside the car UI. [content] is a URL, or raw HTML when it does not look like one.
 * The bottom bar's Back walks the page history first and only leaves the app at the start.
 *
 * A page's own text inputs can't call up the phone's IME: the car UI lives in a Presentation on
 * a virtual display, and the platform's soft keyboard has nowhere sensible to appear there (see
 * [CarKeyboard]'s doc comment - every other text field in this app already draws its own for the
 * same reason). [FOCUS_TRACKING_JS] reports focus/blur on the page's editable elements, and
 * [CarKeyboard] edits the focused one back through injected JS instead of through the DOM's own
 * native input path, which this Presentation can't reach.
 */
@Composable
 fun WebApp(content: String) {
    val navigator = LocalCarNavigator.current
    val darkOutside = LocalDarkOutside.current
    var web by remember { mutableStateOf<WebView?>(null) }
    var fieldText by remember { mutableStateOf<String?>(null) }
    DisposableEffect(web) {
        navigator.backInterceptor = {
            val view = web
            if (view != null && view.canGoBack()) {
                view.goBack()
                true
            } else {
                false
            }
        }
        onDispose { navigator.backInterceptor = null }
    }
    Column(Modifier.fillMaxSize()) {
        AndroidView(
            modifier = Modifier.weight(1f).fillMaxSize(),
            factory = { context ->
                WebView(context).apply {
                    settings.javaScriptEnabled = true
                    settings.domStorageEnabled = true
                    settings.loadWithOverviewMode = true
                    settings.useWideViewPort = true
                    webViewClient = LoggingClient()
                    addJavascriptInterface(
                        FieldFocusBridge(onFocus = { fieldText = it }, onBlur = { fieldText = null }),
                        "GearslipField",
                    )
                    if (content.startsWith("http://") || content.startsWith("https://")) {
                        loadUrl(content)
                    } else {
                        loadDataWithBaseURL(null, content, "text/html", "utf-8", null)
                    }
                    web = this
                }
            },
            // Pages that honour it follow the darkness outside; a first, tweakable use of the signal.
            update = { it.settings.isAlgorithmicDarkeningAllowed = darkOutside },
            onRelease = { it.destroy() },
        )
        fieldText?.let { text ->
            CarKeyboard(
                text = text,
                onTextChange = { updated ->
                    fieldText = updated
                    web?.evaluateJavascript(setFieldValueJs(updated), null)
                },
                onSubmit = { web?.evaluateJavascript(SUBMIT_FIELD_JS, null) },
                onDismiss = {
                    fieldText = null
                    web?.evaluateJavascript(BLUR_FIELD_JS, null)
                },
            )
        }
    }
 }
 private class LoggingClient : WebViewClient() {
    override fun onPageFinished(view: WebView?, url: String?) {
        GearslipLog.i("car web page loaded: $url")
        view?.evaluateJavascript(FOCUS_TRACKING_JS, null)
    }
    // onPageFinished fires for error pages too, so without this a blocked load (missing
    // INTERNET permission, no network) looks like a successful one.
    override fun onReceivedError(view: WebView?, request: WebResourceRequest?, error: WebResourceError?) {
        if (request?.isForMainFrame == true) {
            GearslipLog.e("car web page FAILED: ${request.url} - ${error?.errorCode} ${error?.description}")
        }
    }
    override fun onReceivedHttpError(view: WebView?, request: WebResourceRequest?, response: WebResourceResponse?) {
        if (request?.isForMainFrame == true) {
            GearslipLog.w("car web page HTTP ${response?.statusCode} for ${request.url}")
        }
    }
 }
 /** Tells Kotlin when an editable element on the page gains or loses focus, so [CarKeyboard] can show. */
 private class FieldFocusBridge(private val onFocus: (String) -> Unit, private val onBlur: () -> Unit) {
    private val main = Handler(Looper.getMainLooper())
    // WebView calls into this from its own thread, never Compose's.
    @JavascriptInterface
    fun focused(value: String) { main.post { onFocus(value) } }
    @JavascriptInterface
    fun blurred() { main.post { onBlur() } }
 }
 // Plain `el.value = x` never reaches a React-controlled input: React replaces the native value
 // setter with its own to track edits, so a direct assignment sets the DOM attribute but leaves
 // React's own state (and anything bound to it, like a search box's query) unaware. Calling the
 // *native* setter through the prototype, the same trick browser extensions use, is what actually
 // notifies it once the 'input' event fires.
 private fun setFieldValueJs(value: String) = """
    (function() {
        var el = document.activeElement;
        if (!el) return;
        var proto = el.tagName === 'TEXTAREA' ? window.HTMLTextAreaElement.prototype : window.HTMLInputElement.prototype;
        var setter = Object.getOwnPropertyDescriptor(proto, 'value');
        if (setter && setter.set) { setter.set.call(el, ${JSONObject.quote(value)}); } else { el.value = ${JSONObject.quote(value)}; }
        el.dispatchEvent(new Event('input', { bubbles: true }));
        el.dispatchEvent(new Event('change', { bubbles: true }));
    })();
 """.trimIndent()
 // Fires a real Enter keydown first - the same event a site's own JS would see from a physical
 // keyboard - and only falls back to submitting the form directly if nothing handled it, so a
 // search-as-you-type page and a plain <form> both work without submitting twice.
 // Dismissing the host keyboard without blurring the page's own field would leave it focused,
 // so the next tap anywhere with a text cursor pops the keyboard straight back up.
 private const val BLUR_FIELD_JS = "document.activeElement && document.activeElement.blur();"
 private const val SUBMIT_FIELD_JS = """
    (function() {
        var el = document.activeElement;
        if (!el) return;
        var enter = new KeyboardEvent('keydown', {
            key: 'Enter', code: 'Enter', keyCode: 13, which: 13, bubbles: true, cancelable: true,
        });
        var notHandled = el.dispatchEvent(enter);
        if (notHandled && el.form) {
            if (el.form.requestSubmit) el.form.requestSubmit(); else el.form.submit();
        }
    })();
 """
 /** Reports focus/blur on text inputs, textareas and contenteditable elements to [FieldFocusBridge]. */
 private const val FOCUS_TRACKING_JS = """
    (function() {
        function isEditable(el) {
            if (!el) return false;
            var tag = el.tagName;
            if (tag === 'TEXTAREA') return true;
            if (el.isContentEditable) return true;
            if (tag !== 'INPUT') return false;
            var skip = ['button', 'submit', 'checkbox', 'radio', 'range', 'color', 'file', 'image', 'reset'];
            return skip.indexOf((el.type || 'text').toLowerCase()) === -1;
        }
        document.addEventListener('focusin', function(e) {
            if (isEditable(e.target)) window.GearslipField.focused(e.target.value || '');
        });
        document.addEventListener('focusout', function(e) {
            if (isEditable(e.target)) window.GearslipField.blurred();
        });
    })();
 """
@@ -0,0 +1,332 @@
 package app.seb3thehacker.gearslip.car.theme
 import android.os.SystemClock
 import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.layout.offset
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.draw.drawBehind
 import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.drawOutline
 import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.drawscope.translate
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.interaction.PressInteraction
 import androidx.compose.foundation.interaction.collectIsFocusedAsState
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxScope
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.defaultMinSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Icon
 import androidx.compose.material3.LocalContentColor
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ProvideTextStyle
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.drawWithContent
 import androidx.compose.ui.draw.scale
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.graphics.isSpecified
 import androidx.compose.ui.graphics.lerp
 import androidx.compose.ui.graphics.luminance
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 /** What a control is for, which picks its colours from the Material scheme. */
 enum class GsTone { Primary, Tonal, Neutral, Outline, Danger }
 data class GsColors(val container: Color, val content: Color, val border: Color = Color.Unspecified)
@Composable
 fun gsColors(tone: GsTone): GsColors {
    val s = MaterialTheme.colorScheme
    return when (tone) {
        GsTone.Primary -> GsColors(s.primary, s.onPrimary)
        GsTone.Tonal -> GsColors(s.secondaryContainer, s.onSecondaryContainer)
        GsTone.Neutral -> GsColors(s.surfaceContainerHighest, s.onSurfaceVariant)
        GsTone.Outline -> GsColors(Color.Transparent, s.primary, s.outline)
        GsTone.Danger -> GsColors(s.error, s.onError)
    }
 }
@Composable
 fun gsShape(): Shape = RoundedCornerShape(gsLook().corner)
 /** The current theme's control look, swapped for its light-mode variant on a light UI. */
@Composable
 fun gsLook(): ControlLook {
    val look = LocalGsTheme.current.control
    val light = look.light ?: return look
    return if (MaterialTheme.colorScheme.surface.luminance() > 0.5f) light else look
 }
 /**
 * Paints a control's container in the current theme's finish. Transparent containers stay
 * transparent in every theme. Use directly for custom-shaped tappables; [GsButton] and
 * [GsIconButton] already apply it. [latched] holds a control down - a selected option, the current
 * screen's nav button - in themes that have a pressed-in look.
 */
@Composable
 fun Modifier.gsSurface(
    container: Color,
    shape: Shape = gsShape(),
    border: Color = Color.Unspecified,
    pressed: Boolean = false,
    latched: Boolean = false,
 ): Modifier {
    val look = gsLook()
    val down = pressed || latched
    // The keycap's face sinks onto its base while pressed, and stays down while latched: the base
    // shrinks to nothing and the face moves down by the same amount, so the control's overall size
    // never changes.
    val lipNow by animateDpAsState(if (down) 0.dp else look.lip, tween(if (pressed) 50 else 110), label = "keycap")
    // Tactile: the drop shadow collapses and the face drops by [ControlLook.sink].
    val lift by animateFloatAsState(if (down) 0f else 1f, tween(if (pressed) 50 else 140), label = "lift")
    val sinkNow by animateDpAsState(if (down) look.sink else 0.dp, tween(if (pressed) 50 else 140), label = "sink")
    var m = this
    if (container.alpha > 0f && look.shadow > 0.dp) {
        m = m.drawBehind { drawSoftShadow(shape, look.shadow.toPx(), look.shadowAlpha * lift, lift) }
    }
    if (look.sink > 0.dp) m = m.offset(y = sinkNow)
    if (container.alpha > 0f && look.lip > 0.dp) {
        val base = lerp(container, Color.Black, 0.35f)
        m = m
            .padding(top = look.lip - lipNow, bottom = lipNow)
            .drawBehind {
                translate(top = lipNow.toPx()) {
                    drawOutline(shape.createOutline(size, layoutDirection, this), base)
                }
            }
    }
    m = m.clip(shape)
    if (container.alpha > 0f) {
        val shade = if (container.luminance() > 0.5f) look.bottomShadeOnLight else look.bottomShade
        m = if (look.topLight > 0f || shade > 0f) {
            m.background(
                Brush.verticalGradient(
                    0f to lerp(container, Color.White, look.topLight),
                    0.5f to container,
                    1f to lerp(container, Color.Black, shade),
                ),
            )
        } else {
            m.background(container)
        }
        if (latched && look.insetAlpha > 0f) {
            val inset = look.insetAlpha
            m = m.drawBehind {
                drawRect(Brush.verticalGradient(0f to Color.Black.copy(alpha = inset), 0.3f to Color.Transparent))
            }
        }
        if (look.rimAlpha > 0f) {
            m = m.border(1.dp, Brush.verticalGradient(listOf(Color.White.copy(alpha = look.rimAlpha), Color.Transparent)), shape)
        }
        if (!latched && (look.bevelTop > 0f || look.bevelBottom > 0f)) {
            m = m.border(
                1.dp,
                Brush.verticalGradient(
                    0f to Color.White.copy(alpha = look.bevelTop),
                    0.3f to Color.Transparent,
                    0.7f to Color.Transparent,
                    1f to Color.Black.copy(alpha = look.bevelBottom),
                ),
                shape,
            )
        }
    }
    if (border.isSpecified) m = m.border(BorderStroke(1.dp, border), shape)
    if (pressed) m = m.drawWithContent {
        drawContent()
        drawRect(Color.Black.copy(alpha = look.pressedDim))
    }
    return m
 }
 /**
 * A blurred shadow falling [elevation] below the control, faked with a few stacked, growing
 * outlines: cheap, works on every API level, and already soft enough that the car's video
 * compression has nothing crisp to smear.
 */
 private fun DrawScope.drawSoftShadow(shape: Shape, elevation: Float, alpha: Float, lift: Float) {
    if (alpha <= 0f) return
    val blur = elevation * 2f
    val steps = 6
    for (i in steps downTo 1) {
        val grow = blur * i / steps - blur * 0.35f
        val outline = shape.createOutline(
            Size((size.width + grow * 2).coerceAtLeast(0f), (size.height + grow * 2).coerceAtLeast(0f)),
            layoutDirection,
            this,
        )
        translate(-grow, elevation * lift - grow) {
            drawOutline(outline, Color.Black.copy(alpha = alpha / steps))
        }
    }
 }
 /**
 * Whether a control should look pressed. Held for at least [MIN_PRESS_MS] after the finger lifts:
 * a quick tap would otherwise come and go between two frames of the car's video stream.
 */
@Composable
 private fun rememberPressed(source: MutableInteractionSource): Boolean {
    var shown by remember { mutableStateOf(false) }
    LaunchedEffect(source) {
        var since = 0L
        var release: Job? = null
        source.interactions.collect { interaction ->
            when (interaction) {
                is PressInteraction.Press -> {
                    release?.cancel()
                    since = SystemClock.uptimeMillis()
                    shown = true
                }
                is PressInteraction.Release, is PressInteraction.Cancel -> {
                    release?.cancel()
                    release = launch {
                        delay((MIN_PRESS_MS - (SystemClock.uptimeMillis() - since)).coerceAtLeast(0))
                        shown = false
                    }
                }
            }
        }
    }
    return shown
 }
 private const val MIN_PRESS_MS = 140L
@Composable
 private fun Modifier.gsPressable(
    source: MutableInteractionSource,
    pressed: Boolean,
    enabled: Boolean,
    onClick: () -> Unit,
    onLongClick: (() -> Unit)? = null,
    role: Role = Role.Button,
    shape: Shape = gsShape(),
 ): Modifier {
    val look = gsLook()
    // Reached with the car's knob or D-pad rather than a finger: a ring shows where focus is.
    val focused by source.collectIsFocusedAsState()
    val ring = MaterialTheme.colorScheme.primary
    return this
        .scale(if (pressed) look.pressedScale else 1f)
        .then(if (focused) Modifier.border(3.dp, ring, shape) else Modifier)
        .combinedClickable(
            interactionSource = source,
            indication = null,
            enabled = enabled,
            role = role,
            onLongClick = onLongClick,
            onClick = onClick,
        )
 }
 private fun GsColors.disabled(enabled: Boolean, onSurface: Color): GsColors =
    if (enabled) this
    else GsColors(
        container = if (container.alpha > 0f) onSurface.copy(alpha = 0.12f) else container,
        content = onSurface.copy(alpha = 0.38f),
        border = if (border.isSpecified) onSurface.copy(alpha = 0.12f) else border,
    )
 /** A themed text (or text-and-icon) button. */
@Composable
 fun GsButton(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    tone: GsTone = GsTone.Primary,
    colors: GsColors = gsColors(tone),
    enabled: Boolean = true,
    contentPadding: PaddingValues = PaddingValues(horizontal = 24.dp, vertical = 10.dp),
    content: @Composable RowScope.() -> Unit,
 ) {
    val c = colors.disabled(enabled, MaterialTheme.colorScheme.onSurface)
    val shape = gsShape()
    val source = remember { MutableInteractionSource() }
    val pressed = rememberPressed(source)
    Row(
        modifier
            .defaultMinSize(minWidth = 64.dp, minHeight = 48.dp)
            .gsPressable(source, pressed, enabled, onClick, shape = shape)
            .gsSurface(c.container, shape, c.border, pressed)
            .padding(contentPadding),
        horizontalArrangement = Arrangement.Center,
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(LocalContentColor provides c.content) {
            ProvideTextStyle(MaterialTheme.typography.labelLarge) { content() }
        }
    }
 }
 /** A themed square icon button. Pass a [modifier] size to override the default [size]. */
@Composable
 fun GsIconButton(
    icon: ImageVector,
    contentDescription: String?,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    tone: GsTone = GsTone.Neutral,
    colors: GsColors = gsColors(tone),
    enabled: Boolean = true,
    size: Dp = 48.dp,
    iconSize: Dp = 24.dp,
    shape: Shape = gsShape(),
 ) {
    GsIconBox(onClick, modifier.size(size), colors, enabled, shape) {
        Icon(icon, contentDescription, Modifier.size(iconSize))
    }
 }
 /** [GsIconButton] with arbitrary content, for glyphs drawn in code or app icons. */
@Composable
 fun GsIconBox(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    colors: GsColors = gsColors(GsTone.Neutral),
    enabled: Boolean = true,
    shape: Shape = gsShape(),
    /** Held down, as a keycap theme draws it - for a toggle or the current screen's nav button. */
    latched: Boolean = false,
    onLongClick: (() -> Unit)? = null,
    content: @Composable BoxScope.() -> Unit,
 ) {
    val c = colors.disabled(enabled, MaterialTheme.colorScheme.onSurface)
    val source = remember { MutableInteractionSource() }
    val pressed = rememberPressed(source)
    Box(
        modifier
            .gsPressable(source, pressed, enabled, onClick, onLongClick, shape = shape)
            .gsSurface(c.container, shape, c.border, pressed, latched),
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalContentColor provides c.content) { content() }
    }
 }
@@ -0,0 +1,173 @@
 package app.seb3thehacker.gearslip.car.theme
 import androidx.compose.animation.core.LinearEasing
 import androidx.compose.animation.core.RepeatMode
 import androidx.compose.animation.core.animateFloat
 import androidx.compose.animation.core.infiniteRepeatable
 import androidx.compose.animation.core.rememberInfiniteTransition
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
 import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.drawWithContent
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Path
 import androidx.compose.ui.graphics.StrokeCap
 import androidx.compose.ui.graphics.drawscope.Stroke
 import androidx.compose.ui.graphics.lerp
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import kotlin.math.sin
 /**
 * A capsule progress bar: a tinted track with a glossy fill set inside it, lighter along the
 * top and darker along the bottom. Below its own height the fill narrows into a smaller oval, so
 * a countdown runs smoothly all the way to empty. The flat theme draws Material's wavy bar instead.
 */
@Composable
 fun GsProgressBar(
    fraction: Float,
    modifier: Modifier = Modifier,
    height: Dp = 22.dp,
    color: Color = MaterialTheme.colorScheme.primary,
    /** Brightens the fill, for a bar that's being dragged. */
    active: Boolean = false,
 ) {
    val scheme = MaterialTheme.colorScheme
    val shown = fraction.coerceIn(0f, 1f)
    val inset = 3.dp
    val fill = if (active) lerp(color, Color.White, 0.12f) else color
    if (LocalGsTheme.current.id == GsThemes.Flat.id) {
        WavyBar(shown, fill, lerp(scheme.surfaceContainerHighest, color, 0.12f), modifier.fillMaxWidth().height(height))
        return
    }
    BoxWithConstraints(
        modifier
            .fillMaxWidth()
            .height(height)
            .clip(CircleShape)
            .background(lerp(scheme.surfaceContainerHighest, color, 0.12f))
            .padding(inset),
        contentAlignment = Alignment.CenterStart,
    ) {
        if (shown <= 0f) return@BoxWithConstraints
        Box(
            Modifier
                .width(maxWidth * shown)
                .fillMaxHeight()
                .clip(CircleShape)
                .background(
                    Brush.verticalGradient(
                        0f to lerp(fill, Color.White, 0.30f),
                        0.55f to fill,
                        1f to lerp(fill, Color.Black, 0.22f),
                    ),
                )
                // The gloss: a soft white band across the top half.
                .drawWithContent {
                    drawContent()
                    drawRect(
                        Brush.verticalGradient(
                            0f to Color.White.copy(alpha = 0.35f),
                            0.5f to Color.White.copy(alpha = 0.05f),
                            0.5f to Color.Transparent,
                        ),
                    )
                },
        )
    }
 }
 /**
 * Material 3's wavy progress bar, drawn here because the stable library doesn't offer it yet: the
 * filled part is a sine wave that drifts along, then a gap, then a straight track and a stop dot
 * at the end.
 */
@Composable
 private fun WavyBar(fraction: Float, color: Color, track: Color, modifier: Modifier) {
    val phase by rememberInfiniteTransition(label = "wave").animateFloat(
        0f, 1f, infiniteRepeatable(tween(1_000, easing = LinearEasing), RepeatMode.Restart), label = "phase",
    )
    Canvas(modifier) {
        val stroke = 4.dp.toPx()
        val amplitude = (size.height / 2 - stroke).coerceIn(0f, 3.dp.toPx())
        val wavelength = 32.dp.toPx()
        val gap = 6.dp.toPx()
        val mid = size.height / 2
        val start = stroke / 2
        val end = size.width - stroke / 2
        val split = start + (end - start) * fraction
        if (split > start) {
            val wave = Path()
            var x = start
            val shift = phase * wavelength
            while (x <= split) {
                val y = mid + amplitude * sin(2 * Math.PI * (x - shift) / wavelength).toFloat()
                if (x == start) wave.moveTo(x, y) else wave.lineTo(x, y)
                x += 1f
            }
            drawPath(wave, color, style = Stroke(stroke, cap = StrokeCap.Round))
        }
        val trackStart = if (split > start) split + gap + stroke else start
        if (trackStart < end) {
            drawLine(track, Offset(trackStart, mid), Offset(end, mid), stroke, StrokeCap.Round)
        }
        drawCircle(color, stroke / 2, Offset(end, mid))
    }
 }
 /**
 * [GsProgressBar] that seeks: tapping or dragging moves it. The position is committed on release
 * rather than on every pixel of a drag, because each commit is a request to the media app.
 */
@Composable
 fun GsSeekBar(
    fraction: Float,
    onSeek: (Float) -> Unit,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
 ) {
    var dragging by remember { mutableStateOf<Float?>(null) }
    // A taller touch area than the bar itself, so it's easy to hit on a car screen.
    Box(
        modifier
            .fillMaxWidth()
            .height(36.dp)
            .then(
                if (!enabled) Modifier else Modifier
                    .pointerInput(Unit) { detectTapGestures { onSeek((it.x / size.width).coerceIn(0f, 1f)) } }
                    .pointerInput(Unit) {
                        detectHorizontalDragGestures(
                            onDragStart = { dragging = (it.x / size.width).coerceIn(0f, 1f) },
                            onDragEnd = { dragging?.let(onSeek); dragging = null },
                            onDragCancel = { dragging = null },
                        ) { change, _ -> dragging = (change.position.x / size.width).coerceIn(0f, 1f) }
                    },
            ),
        contentAlignment = Alignment.Center,
    ) {
        GsProgressBar(dragging ?: fraction, active = dragging != null)
    }
 }
@@ -0,0 +1,43 @@
 package app.seb3thehacker.gearslip.car.theme
 import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 /**
 * An on/off switch in the current theme's finish: the track is pressed in while on, the knob is
 * raised like a button. The whole switch is one tap target, as big as a nav bar button.
 */
@Composable
 fun GsSwitch(checked: Boolean, onCheckedChange: (Boolean) -> Unit, modifier: Modifier = Modifier) {
    val scheme = MaterialTheme.colorScheme
    val knob = 26.dp
    val travel = 64.dp - knob - 8.dp
    val x by animateDpAsState(if (checked) travel else 0.dp, tween(140), label = "switch")
    GsIconBox(
        onClick = { onCheckedChange(!checked) },
        modifier = modifier.size(width = 64.dp, height = 36.dp),
        colors = if (checked) GsColors(scheme.primary, scheme.onPrimary) else GsColors(scheme.surfaceContainerHighest, scheme.onSurfaceVariant),
        shape = CircleShape,
        latched = checked,
    ) {
        Box(Modifier.matchParentSize().padding(4.dp), contentAlignment = Alignment.CenterStart) {
            Box(
                Modifier
                    .offset(x = x)
                    .size(knob)
                    .gsSurface(if (checked) scheme.onPrimary else scheme.outline, CircleShape),
            )
        }
    }
 }
@@ -0,0 +1,114 @@
 package app.seb3thehacker.gearslip.car.theme
 import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.staticCompositionLocalOf
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 /**
 * How the car UI's controls look, separate from its colours: [MaterialTheme]'s colour scheme still
 * decides what colour a button is, and this decides how that colour is drawn. A theme is plain
 * data, so a user-supplied theme later is just another instance - nothing about the built-in ones
 * is special beyond being listed in [GsThemes.builtIn].
 */
@Immutable
 data class GsTheme(
    /** Stable key persisted in settings; never reuse one for a different look. */
    val id: String,
    val name: String,
    val control: ControlLook,
 )
 /** The finish on anything tappable that has a container: buttons, toggles, keypad keys. */
@Immutable
 data class ControlLook(
    val corner: Dp = 12.dp,
    /** How far the top edge is lifted towards white, 0..1, fading evenly to the base colour at the centre. */
    val topLight: Float = 0f,
    /** How far the bottom edge is pushed towards black, 0..1. */
    val bottomShade: Float = 0f,
    /**
     * [bottomShade] for containers that are already light, where lifting the top towards white
     * barely shows: those get their depth from a darker bottom edge instead.
     */
    val bottomShadeOnLight: Float = 0f,
    /** Alpha of the thin highlight along the top rim, fading out down the sides; 0 for none. */
    val rimAlpha: Float = 0f,
    /** A solid darker base under the button, like a keycap; 0 for none. */
    val lip: Dp = 0.dp,
    /** How far a soft drop shadow falls below the button; 0 for none. Its blur is twice this. */
    val shadow: Dp = 0.dp,
    val shadowAlpha: Float = 0f,
    /**
     * A 1px bevel on the edge only - light along the top, dark along the bottom - so depth reads
     * at any size without shading the face itself. 0 for none.
     */
    val bevelTop: Float = 0f,
    val bevelBottom: Float = 0f,
    /** How far the face drops while pressed; 0 for none. */
    val sink: Dp = 0.dp,
    /**
     * Alpha of the shadow cast inside the top edge of a latched control (a selected option, the
     * current screen's nav button), so it reads as pushed in. 0 for none.
     */
    val insetAlpha: Float = 0f,
    /**
     * Alpha of the dark overlay while pressed. Heavier than a ripple on purpose: the car screen
     * shows a video stream a frame or two behind the finger, so subtle feedback gets lost.
     */
    val pressedDim: Float = 0.22f,
    /** Scale while pressed, 1 for none. */
    val pressedScale: Float = 0.95f,
    /** Replaces this look when the UI is light, for effects that only work on one background. */
    val light: ControlLook? = null,
 )
 object GsThemes {
    val Keycap = GsTheme(
        id = "keycap",
        name = "Keycap",
        control = ControlLook(lip = 4.dp, pressedScale = 1f),
    )
    val Tactile = GsTheme(
        id = "tactile",
        name = "Tactile",
        control = ControlLook(
            topLight = 0.05f,
            shadow = 3.dp,
            shadowAlpha = 0.32f,
            bevelTop = 0.16f,
            bevelBottom = 0.22f,
            sink = 2.dp,
            insetAlpha = 0.30f,
            pressedDim = 0.12f,
            pressedScale = 1f,
            // A wide soft shadow bands once the car's video stream compresses it on a light
            // background, so light mode gets a tight one and leans on the bevel instead.
            light = ControlLook(
                topLight = 0.05f,
                shadow = 1.5.dp,
                shadowAlpha = 0.38f,
                bevelTop = 0.24f,
                bevelBottom = 0.30f,
                sink = 2.dp,
                insetAlpha = 0.30f,
                pressedDim = 0.12f,
                pressedScale = 1f,
            ),
        ),
    )
    val Flat = GsTheme(
        id = "flat",
        name = "Flat",
        control = ControlLook(),
    )
    val default = Tactile
    val builtIn = listOf(Tactile, Keycap, Flat)
    fun byId(id: String?): GsTheme = builtIn.firstOrNull { it.id == id } ?: default
 }
 val LocalGsTheme = staticCompositionLocalOf { GsThemes.default }
@@ -0,0 +1,47 @@
 package app.seb3thehacker.gearslip.host
 import android.content.Context
 import android.content.pm.PackageManager
 /**
 * Google's own Android Auto, in whatever guise it appears. Gearslip replaces it, so its entries
 * (there are many: one per screen it registers) are noise in every list of apps to open.
 */
 object AndroidAuto {
    /** Kept in sync with the `<queries><package>` entries in the manifest: package visibility
     * hides an app's presence entirely unless one names it (or a broader query matches it), and
     * this one has no launcher icon on current builds for a launcher-category query to find. */
    private val KNOWN_PACKAGES = listOf("com.google.android.projection.gearhead")
    private val PACKAGE_MARKERS = listOf("gearhead", "projection.gearhead", "android.auto", "androidauto")
    fun matches(packageName: String, label: String): Boolean {
        val pkg = packageName.lowercase()
        if (PACKAGE_MARKERS.any { it in pkg }) return true
        val name = label.lowercase().replace(Regex("[^a-z ]"), " ")
        return "android auto" in name || "androidauto" in name.replace(" ", "")
    }
    /** The package name of Google's Android Auto, if it is installed. */
    fun installedPackage(context: Context): String? {
        val manager = context.packageManager
        return KNOWN_PACKAGES.firstOrNull { pkg ->
            runCatching { manager.getPackageInfo(pkg, 0) }.isSuccess
        }
    }
    /**
     * Whether [packageName] can still fight Gearslip for the USB connection: installed, and not
     * already disabled for this user. `ApplicationInfo.enabled` only reflects the manifest's
     * static default, not a driver's own Settings toggle, so this reads the actual runtime
     * setting instead - a driver who disabled it instead of uninstalling it (the app info screen
     * offers both) has already done what this step asks.
     */
    fun isActive(context: Context, packageName: String): Boolean {
        val setting = runCatching { context.packageManager.getApplicationEnabledSetting(packageName) }
            .getOrDefault(PackageManager.COMPONENT_ENABLED_STATE_DEFAULT)
        return setting == PackageManager.COMPONENT_ENABLED_STATE_DEFAULT ||
            setting == PackageManager.COMPONENT_ENABLED_STATE_ENABLED
    }
 }
Author	SHA1	Message	Date
Seb3thehacker	01a7ae1930	v0.1.10-alpha	2026-10-01 20:48:10 -07:00
Seb3thehacker	c52a6c32b7	screen size auto negotiation	2026-10-01 20:43:26 -07:00
Seb3thehacker	f21df41506	audi 32 to 64 bit fix	2026-10-01 20:37:04 -07:00
Seb3thehacker	ff8a6a4cff	app organization and movement options	2026-10-01 20:34:35 -07:00
Seb3thehacker	a2d9ed7008	maps UI tweaks	2026-10-01 20:17:44 -07:00
Seb3thehacker	3994c9bd2e	new supported apps, redesign UI for apps not fully supported	2026-10-01 14:28:44 -07:00
Seb3thehacker	4e4a246a51	voice prompt timer fixed	2026-10-01 12:55:40 -07:00
Seb3thehacker	ebd0ba4add	map screen wont rebuild on each app/page switch	2026-10-01 12:35:49 -07:00
Seb3thehacker	42785ce6be	Merge pull request #8 from Brian5647/fix-map-freeze fix the drawing after coming back from the media menu to navigation app	2026-10-01 12:19:40 -07:00
Seb3thehacker	db205919c8	Point contributors at the experimental branch	2026-10-01 11:42:32 -07:00
Seb3thehacker	f452099926	docs updates for developers	2026-10-01 11:33:27 -07:00
Seb3thehacker	03b74b1150	issue templates, doc updates	2026-10-01 11:20:14 -07:00
Brian5647	fbaeb0cc57	This is to fix the drawing after coming back from the media menu to the navigtion app. For organic maps the change from yesterday was fine. For flitsmeister it freezes the screen.	2026-10-01 19:03:45 +02:00
Seb3thehacker	5f557a5973	changelog update	2026-10-01 00:45:09 -07:00
Seb3thehacker	86edc42b98	ok real final commit	2026-10-01 00:35:10 -07:00
Seb3thehacker	68f9bf35a1	Final tweaks for Gearslip v0.1.0	2026-10-01 00:34:53 -07:00
Seb3thehacker	e314aa8546	Voice replies, on-device speech, message cards and 0.1.0-alpha Gearslip now reads messages aloud and takes replies by voice. It asks whether to reply, reads the reply back and sends it after a countdown. Say "cancel" or "change it" to stop or redo it, or tap a quick reply. Speech-to-text runs on the phone with whisper.cpp and a small Whisper model, so voice works without Google services. The model ships in the repo, so a fresh clone builds with nothing to download. New messages show as one card at the top right, with a bar counting down to when it closes or sends. Other changes: - Steering wheel buttons, knobs and D-pads drive the car screen. - Smoother car audio: chunks wait for the car instead of dropping. - Sharper, more responsive video. - The Gearslip switch in Settings now stops it taking the USB connection. - Apps that refuse Gearslip say so instead of loading forever. - The phone asks for notification permission. - The home screen stays upright. - The car screen shows what's new after an update.	2026-10-01 00:03:53 -07:00
Seb3thehacker	1b2010f939	car rejection leason logging	2026-09-30 13:28:29 -07:00
Seb3thehacker	f25eafcc48	Keep the map loaded behind other screens Leaving Home used to tear down the map's surface, so coming back showed black for a second or two while the nav app redrew. Home now stays composed under every other screen.	2026-09-30 13:17:37 -07:00
Seb3thehacker	473c12ad8f	Merge branch 'pr-5' into try-pr-5 Fix map loading by drawing a virtual display.	2026-09-30 13:04:16 -07:00
Seb3thehacker	89b8157eb9	Messaging screen, units setting, turn pill, messaging app support	2026-09-30 13:03:55 -07:00
Brian5647	304c1de3bc	Update CarAppStage.kt	2026-09-30 20:34:12 +02:00
Brian5647andClaude Opus 5.5	6156da4b67	Keep car apps online in the background and fix surface resizes Car apps are now bound as a foreground service, so they keep network access when Gearslip isn't the top app on the phone. Before, an app bound in the background could lose network under Doze: its map and GPS kept working while search and routing went dead. The app surface is also recreated whenever the map area changes size, the way Android Auto does it, instead of being resized in place. Apps that draw through their own VirtualDisplay rebuild it on the reused surface, and the old display's teardown then cuts the new one off, freezing the map for good. Found with Flitsmeister after picking a route. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>	2026-09-30 20:29:58 +02:00
Seb3thehacker	ae7c3ec308	Voice assistant, vehicle data, and template rendering fixes Push-to-talk voice control, gated behind experimental settings alongside a new raw vehicle sensor screen. Spotify now shows as partial instead of working since its browse tile rejects Gearslip as a host. Fixed a gap where a live nav app couldn't take a fresh destination without a full reconnect.	2026-09-29 18:07:48 -07:00
Seb3thehacker	e7f0aef43d	LIVI supported	2026-09-28 15:09:51 -07:00
Seb3thehacker	97c6a26f61	update readme	2026-09-28 01:09:33 -07:00
Seb3thehacker	5f9701ccff	Release 0.0.05-alpha: guided setup, downloadable certificate, car phone app, media rework - First run now asks for permissions one at a time, each on its own screen with an Allow or Skip, instead of firing every system dialog at once from a cold start - The head unit certificate can be downloaded straight from the opencardev/aasdk repository with one tap, on top of the existing adb-staged and file-import paths; Settings shows which source is active and lets an imported or downloaded certificate be removed - A phone app on the car screen: a keypad and a searchable contacts list, with a confirmation card before every call - The web browser draws its own on-screen keyboard for a page's text fields, so a search box or address bar can be typed into from the car screen - Media player rework: a dedicated Now Playing tab with a bigger, screen-size-aware layout, an Up Next tab showing the app's real queue, and Browse/Lyrics tabs that share the same rail - Waze and Google Messages are marked broken instead of pretending to work; Google's own dialer, Assistant, and Android Auto entries are hidden from the car launcher entirely; Aardvark and Vivi Music are marked tested and working - A help screen replaces the old wall of setup text on the home screen - The display-calibration screen is gone - it did its job	2026-09-26 16:53:28 -07:00
Seb3thehacker	043dc11251	Add phone call handling on the car screen Incoming calls now show the caller (name via contacts, else number) on the car UI with answer/decline, using a call screening service so the car sees a call before it rings. Also adds pinnable nav bar shortcuts, lowers minSdk to 31 for wider device support, and bumps to 0.0.04-pre.	2026-09-26 11:43:09 -07:00
Seb3thehackerandClaude Sonnet 5	48be745659	README: explain the screen-share indicator for audio Gearslip captures playback, not the screen, but Android's consent dialog and persistent indicator look identical either way. Note why the indicator appears, and correct the adjacent no-adb claim to mention the two optional audio commands as the sole exception. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>	2026-09-22 00:18:39 -07:00
Seb3thehackerandClaude Sonnet 5	7e4b4d6b99	Send media audio to the car without a per-drive prompt The head unit offers a media sink, but Android answers Setup with an empty reply instead of a Config message. AudioLink now falls back to the advertised sink after 2.5s. AudioCaptureService captures by audio usage, not by app, so switching media apps costs nothing further and one grant covers a whole drive. A one-time adb command (PROJECT_MEDIA) removes the consent dialog itself; the setup screen now includes it as a copyable step, next to the existing mic-permission step. Capture counts as a screen share, so Android 15 hides notification contents while it runs. ScreenShareGuard lifts that protection for the length of the capture, with a second adb grant (WRITE_SECURE_SETTINGS), and restores it afterward, including after a crash. The phone keeps playing what it captures, so AudioCaptureService also mutes STREAM_MUSIC for the drive and restores it on every exit path. Adds a debug bench (BenchAudioSink, CarPreviewActivity --ez audio true) for testing the audio path without a car, and a unit test that rebuilds the real head unit's ServiceDiscoveryResponse from a logged session to confirm the media and guidance sinks are found correctly. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>	2026-09-22 00:11:59 -07:00
Seb3thehacker	a8b49a3672	Release v0.0.03-pre: weather, template cards, media fallbacks, setup steps - Weather from Open-Meteo with a place name, a forecast screen and a nav bar icon; a fresh location fix is requested when the last one is stale - Map controls are solid, one size, and fade out after four seconds; pinch to zoom works because every finger now reaches the app - Map templates draw their content in a floating card; toggle and radio rows show their state, the Back and Pan actions work, and details text and buttons are larger - Home player gains Lyrics and Minimise buttons; minimised, it lives in the nav bar - Media apps that hide their library show what they are and can still be controlled; apps that refuse Gearslip as a host say why - Debug mode switch, session report in the log, and log sharing as a file attachment - Launcher, phone apps, weather and calendar load at startup - Web app opens DuckDuckGo by default - Home screen lists the setup steps; the launcher marks apps tested and working	2026-09-21 01:14:49 -07:00
Seb3thehacker	94f8f23a56	updated broken links	2026-09-20 14:27:43 -07:00
Seb3thehacker	e1732f8365	initial standards implemented + new docs like how to build apps	2026-09-20 13:40:32 -07:00
Seb3thehacker	cb895f0658	Release v0.0.02-pre: car dashboard, nav bar rework, cached launcher - Nav bar is icon-only and shorter, with a now-playing pill on non-home screens - Clock opens a calendar and weather dashboard (adds READ_CALENDAR) - Web page URL is now set from the car's Settings screen - Launcher app scan and weather are cached - Home player gains skip buttons and a larger cover	2026-09-20 03:00:25 -07:00
Seb3thehacker	5b7b9499ca	Gearslip: phone-side Android Auto client	2026-09-20 02:09:47 -07:00