name: Merge Queue

on:
  pull_request:
    types: [labeled, unlabeled, synchronize, reopened, ready_for_review]
  push:
    branches: [main]

jobs:
  merge-queue:
    runs-on: ubuntu-latest
    if: github.event.pull_request.draft == false
    
    steps:
    - name: Checkout code
      uses: actions/checkout@v4
      with:
        fetch-depth: 0
        sparse-checkout: |
          deployment/
          platform/
          systemd/
          .github/

    - name: Determine PR class
      id: classify
      run: |
        # Class A: High risk changes
        if [[ -n "$(git diff --name-only origin/main...HEAD | grep -E '(deployment/environments/|systemd/|platform/.*/dto/)')" ]]; then
          echo "class=a" >> $GITHUB_OUTPUT
        # Class B: Medium risk changes  
        elif [[ -n "$(git diff --name-only origin/main...HEAD | grep -E '(platform/.*/scripts/|platform/.*/configs/)')" ]]; then
          echo "class=b" >> $GITHUB_OUTPUT
        # Class C: Low risk changes
        else
          echo "class=c" >> $GITHUB_OUTPUT
        fi

    - name: Run DTO schema validation
      if: steps.classify.outputs.class != 'c'
      run: |
        python3 /data/adaptai/deployment/generators/validate_dto.py

    - name: Check generator freshness
      if: steps.classify.outputs.class != 'c'
      run: |
        python3 /data/adaptai/deployment/generators/check_freshness.py

    - name: Run port collision scan
      if: steps.classify.outputs.class != 'c'
      run: |
        python3 /data/adaptai/deployment/generators/scan_ports.py

    - name: Check runbook presence
      if: steps.classify.outputs.class != 'c'
      run: |
        python3 /data/adaptai/deployment/generators/check_runbooks.py

    - name: Validate systemd/supervisor syntax
      if: steps.classify.outputs.class != 'c'
      run: |
        python3 /data/adaptai/deployment/generators/validate_units.py

    - name: Queue management
      if: github.event_name == 'pull_request'
      run: |
        # Add to appropriate queue based on class
        python3 /data/adaptai/.github/scripts/queue_manager.py \
          --pr ${{ github.event.pull_request.number }} \
          --class ${{ steps.classify.outputs.class }} \
          --action add

    - name: Process Class A queue (serial)
      if: steps.classify.outputs.class == 'a'
      run: |
        python3 /data/adaptai/.github/scripts/process_queue.py --class a --batch-size 1

    - name: Process Class B queue (batched)
      if: steps.classify.outputs.class == 'b'
      run: |
        python3 /data/adaptai/.github/scripts/process_queue.py --class b --batch-size 3

    - name: Process Class C queue (batched)
      if: steps.classify.outputs.class == 'c'
      run: |
        python3 /data/adaptai/.github/scripts/process_queue.py --class c --batch-size 5

    - name: Check for pause-needed label
      if: contains(github.event.pull_request.labels.*.name, 'pause-needed')
      run: |
        echo "PR has pause-needed label - blocking merge"
        exit 1

    - name: Verify CODEOWNERS approval
      run: |
        python3 /data/adaptai/.github/scripts/verify_codeowners.py