name: Android CI (Merge Queue)

on:
  merge_group:
    types: [checks_requested]

permissions:
  contents: read

# Note: github.ref is unique per merge-group entry (gh-readonly-queue/main/pr-N-<sha>),
# so this group never dedupes across re-queues of the same PR — the cancel-superseded
# job below handles that explicitly.
concurrency:
  group: build-mq-${{ github.ref }}
  cancel-in-progress: true

jobs:
  # When a PR is re-queued (an entry ahead of it failed or was removed), GitHub creates a
  # new merge group but does NOT cancel the workflow runs of the destroyed one. Those stale
  # runs sit queued/running and starve the runner pool. Cancel any older merge-queue run
  # for the same PR — only the newest merge group per PR is ever valid.
  cancel-superseded:
    name: Cancel Superseded Queue Runs
    if: github.repository == 'meshtastic/Meshtastic-Android'
    runs-on: ubuntu-24.04-arm
    timeout-minutes: 5
    permissions:
      actions: write
    steps:
      - name: Cancel older merge-queue runs for the same PR
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          # github.ref_name: gh-readonly-queue/main/pr-<num>-<base-sha>
          PR_PREFIX=$(echo "${{ github.ref_name }}" | grep -oE 'gh-readonly-queue/.+/pr-[0-9]+-')
          if [ -z "$PR_PREFIX" ]; then
            echo "Could not parse PR from ref '${{ github.ref_name }}'; skipping."
            exit 0
          fi
          for status in queued in_progress; do
            gh api "repos/${{ github.repository }}/actions/runs?event=merge_group&status=${status}&per_page=100" \
              --jq ".workflow_runs[] | select(.head_branch | startswith(\"$PR_PREFIX\")) | select(.id < ${{ github.run_id }}) | .id"
          done | sort -u | while read -r run_id; do
            echo "Cancelling superseded run $run_id"
            gh run cancel "$run_id" --repo "${{ github.repository }}" || true
          done

  # Docs-only queue entries (changelog updates, markdown fixes) cannot affect the build;
  # skip the heavy pipeline for them. Anything outside docs/ and *.md runs full CI.
  # Mirrors the paths-ignore list in main-check.yml.
  check-changes:
    name: Check Changes
    if: github.repository == 'meshtastic/Meshtastic-Android'
    runs-on: ubuntu-24.04-arm
    timeout-minutes: 5
    outputs:
      android: ${{ steps.filter.outputs.android }}
    steps:
      - uses: actions/checkout@v7.0.0
        with:
          fetch-depth: 1
      - name: Diff merge group against its base
        id: filter
        run: |
          git fetch --depth=1 origin "${{ github.event.merge_group.base_sha }}"
          changed=$(git diff --name-only "${{ github.event.merge_group.base_sha }}" "${{ github.event.merge_group.head_sha }}")
          echo "Changed files:"
          echo "$changed"
          if echo "$changed" | grep -qvE '^docs/|\.md$|^$'; then
            echo "android=true" >> "$GITHUB_OUTPUT"
          else
            echo "android=false" >> "$GITHUB_OUTPUT"
          fi

  android-check:
    needs: check-changes
    if: github.repository == 'meshtastic/Meshtastic-Android' && needs.check-changes.outputs.android == 'true'
    uses: ./.github/workflows/reusable-check.yml
    with:
      run_lint: true
      run_unit_tests: true
      upload_artifacts: false
    secrets: inherit

  check-workflow-status:
    name: Check Workflow Status
    runs-on: ubuntu-24.04-arm
    timeout-minutes: 5
    permissions: {}
    needs:
      - check-changes
      - android-check
    if: always()
    steps:
      - name: Check Workflow Status
        run: |
          if [[ "${{ needs.check-changes.result }}" != "success" ]]; then
            echo "::error::Change detection failed"
            exit 1
          fi
          if [[ "${{ needs.check-changes.outputs.android }}" == "true" && ("${{ needs.android-check.result }}" == "failure" || "${{ needs.android-check.result }}" == "cancelled") ]]; then
            echo "::error::Android Check failed"
            exit 1
          fi
          echo "All jobs passed successfully"