name: PR Labeler

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write

jobs:
  label:
    name: Auto-label PR
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Apply labels
        uses: actions/labeler@v4
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}"
          configuration-path: .github/labeler.yml
          sync-labels: true

      - name: Comment on auto-merge eligible PRs
        uses: actions/github-script@v6
        with:
          script: |
            const pr = context.payload.pull_request;
            const labels = pr.labels.map(l => l.name);

            const autoMergeLabels = [
              'claude-auto',
              'atlas-auto',
              'docs',
              'chore',
              'tests-only'
            ];

            const hasAutoMergeLabel = labels.some(l => autoMergeLabels.includes(l));

            if (hasAutoMergeLabel) {
              await github.rest.issues.createComment({
                issue_number: pr.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: '🤖 This PR is eligible for auto-merge based on its labels. It will be added to the merge queue once all checks pass.'
              });
            }