name: Validate and auto-fix script formatting

on:
  push:
    branches:
      - main
  pull_request_target:
    paths:
      - "**/*.sh"
      - "**/*.func"

jobs:
  shfmt:
    name: Check and fix formatting
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - name: Get pull request information
        if: github.event_name == 'pull_request_target'
        uses: actions/github-script@v7
        id: pr
        with:
          script: |
            const { data: pullRequest } = await github.rest.pulls.get({
              ...context.repo,
              pull_number: context.payload.pull_request.number,
            });
            return pullRequest;

      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event_name == 'pull_request_target' && fromJSON(steps.pr.outputs.result).merge_commit_sha || '' }}

      - name: Get changed files
        id: changed-files
        run: |
          if [ "${{ github.event_name }}" == "pull_request_target" ]; then
              echo "files=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ steps.pr.outputs.result && fromJSON(steps.pr.outputs.result).merge_commit_sha }} | grep -E '\.(sh|func)$' | xargs)" >> $GITHUB_OUTPUT
          else
              echo "files=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | grep -E '\.(sh|func)$' | xargs)" >> $GITHUB_OUTPUT
          fi

      - name: Set up Go
        if: steps.changed-files.outputs.files != ''
        uses: actions/setup-go@v5

      - name: Install shfmt
        if: steps.changed-files.outputs.files != ''
        run: |
          go install mvdan.cc/sh/v3/cmd/shfmt@latest
          echo "$GOPATH/bin" >> $GITHUB_PATH

      - name: Fix formatting
        if: steps.changed-files.outputs.files != ''
        run: |
          shfmt -w ${{ steps.changed-files.outputs.files }}

      - name: Commit and push changes
        if: steps.changed-files.outputs.files != '' && github.event_name == 'pull_request_target'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add ${{ steps.changed-files.outputs.files }}
          git commit -m "chore: auto-fix formatting issues"
          git push

      - name: Post comment with results
        if: always() && github.event_name == 'pull_request_target'
        uses: actions/github-script@v7
        with:
          script: |
            const result = "${{ job.status }}" === "success" ? "success" : "failure";
            const issueNumber = context.payload.pull_request
              ? context.payload.pull_request.number
              : null;
            const commentIdentifier = "validate-formatting";
            let newCommentBody = `<!-- ${commentIdentifier}-start -->\n### Script Formatting Results\n\n`;

            if (result === "failure") {
              newCommentBody += `:x: Formatting issues were found and automatically fixed.\n`;
            } else {
              newCommentBody += `:rocket: All scripts are properly formatted!\n`;
            }

            newCommentBody += `\n\n<!-- ${commentIdentifier}-end -->`;

            if (issueNumber) {
              const { data: comments } = await github.rest.issues.listComments({
                ...context.repo,
                issue_number: issueNumber,
              });

              const existingComment = comments.find(
                (comment) => comment.user.login === "github-actions[bot]" &&
                             comment.body.includes(commentIdentifier)
              );

              if (existingComment) {
                await github.rest.issues.updateComment({
                  ...context.repo,
                  comment_id: existingComment.id,
                  body: newCommentBody,
                });
              } else {
                await github.rest.issues.createComment({
                  ...context.repo,
                  issue_number: issueNumber,
                  body: newCommentBody,
                });
              }