name: Auto Merge

on:
  pull_request:
    types: [opened, synchronize, reopened]
  pull_request_review:
    types: [submitted]
  check_suite:
    types: [completed]

jobs:
  auto-merge:
    name: Auto Merge PR
    runs-on: ubuntu-latest
    if: github.event.pull_request.draft == false
    timeout-minutes: 5

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Check if PR is ready for auto-merge
        id: check
        run: |
          # Check if PR has auto-merge label or is from dependabot
          if [[ "${{ contains(github.event.pull_request.labels.*.name, 'auto-merge') }}" == "true" ]] ||
             [[ "${{ github.event.pull_request.user.login }}" == "dependabot[bot]" ]]; then
            echo "eligible=true" >> $GITHUB_OUTPUT
          else
            echo "eligible=false" >> $GITHUB_OUTPUT
          fi

      - name: Enable auto-merge for eligible PRs
        if: steps.check.outputs.eligible == 'true'
        run: |
          # Wait for CI checks to pass
          gh pr checks ${{ github.event.pull_request.number }} --watch --timeout 600

          # Check if PR has required approvals (configure this based on your repo settings)
          APPROVALS=$(gh pr view ${{ github.event.pull_request.number }} --json reviewDecision -q '.reviewDecision')

          if [[ "$APPROVALS" == "APPROVED" ]] || [[ "${{ github.event.pull_request.user.login }}" == "dependabot[bot]" ]]; then
            echo "✅ All conditions met - enabling auto-merge"
            gh pr merge ${{ github.event.pull_request.number }} --squash --auto
          else
            echo "⏳ Waiting for approvals"
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Comment on successful auto-merge setup
        if: steps.check.outputs.eligible == 'true'
        run: |
          gh pr comment ${{ github.event.pull_request.number }} --body "🤖 Auto-merge enabled. This PR will be automatically merged once all checks pass and required approvals are obtained."
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}