navigation: search near the phone, so "navigate to Del Taco" finds the closest one

gearslip/src/main/java/app/seb3thehacker/gearslip/host/CarAppConnection.kt

@@ -301,11 +301,14 @@ class CarAppConnection(private val context: Context) {
     /**
      * "navigate to X" deep link, the same one Android Auto's own Assistant integration sends -
      * [ACTION_NAVIGATE] with the destination as a `geo:` search query, rather than anything
-     * app-specific.
+     * app-specific. Centred on the phone when there's a fix: `geo:0,0` made Organic Maps pick the
+     * first Del Taco it found anywhere, not the nearest. The location goes only to the map app.
      */
-    private fun navigateIntent(destination: String) =
-        Intent(CarContext.ACTION_NAVIGATE, Uri.parse("geo:0,0?q=" + Uri.encode(destination)))
+    private fun navigateIntent(destination: String): Intent {
+        val near = app.seb3thehacker.gearslip.notify.CarMotion.nearHere(context) ?: "0,0"
+        return Intent(CarContext.ACTION_NAVIGATE, Uri.parse("geo:$near?q=" + Uri.encode(destination)))
             .setComponent(component)
+    }
 
     /**
      * Sends a fresh destination to an app that's already running, instead of tearing it down

gearslip/src/main/java/app/seb3thehacker/gearslip/notify/CarMotion.kt

@@ -22,6 +22,33 @@ object CarMotion {
     private var listener: LocationListener? = null
     private var speed = 0f
     private var fixAt = 0L
+    @Volatile private var last: Location? = null
+
+    /** A fix older than this is somewhere the car has left. */
+    private const val NEAR_STALE_MS = 10 * 60_000L
+
+    /**
+     * Where the phone is, as "lat,lng", for "navigate to Del Taco" to find the nearest one. From
+     * this drive's GPS, or Android's last known fix; null with no permission or nothing recent.
+     */
+    fun nearHere(context: Context): String? {
+        val fix = last?.takeIf { SystemClock.elapsedRealtime() - fixAt < NEAR_STALE_MS }
+            ?: lastKnown(context)
+            ?: return null
+        return String.format(java.util.Locale.US, "%.5f,%.5f", fix.latitude, fix.longitude)
+    }
+
+    private fun lastKnown(context: Context): Location? {
+        if (context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
+            context.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
+        ) return null
+        val manager = context.getSystemService(LocationManager::class.java) ?: return null
+        val now = System.currentTimeMillis()
+        return manager.getProviders(true)
+            .mapNotNull { runCatching { manager.getLastKnownLocation(it) }.getOrNull() }
+            .filter { now - it.time < NEAR_STALE_MS }
+            .maxByOrNull { it.time }
+    }
 
     val moving: Boolean
         get() = SystemClock.elapsedRealtime() - fixAt < STALE_MS && speed > MOVING_MS
@@ -34,6 +61,7 @@ object CarMotion {
             override fun onLocationChanged(location: Location) {
                 speed = if (location.hasSpeed()) location.speed else 0f
                 fixAt = SystemClock.elapsedRealtime()
+                last = location
             }
         }
         listener = l