name: Dependabot Auto Merge

on:
  pull_request_target:
    types:
      - opened
      - reopened
      - synchronize
      - ready_for_review

permissions:
  contents: write
  pull-requests: write

jobs:
  enable-auto-merge:
    if: github.actor == 'dependabot[bot]' && github.event.pull_request.draft == false
    runs-on: ubuntu-latest

    steps:
      - name: Fetch Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v3
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: Enable auto-merge for version updates
        if: |
          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
          steps.metadata.outputs.update-type == 'version-update:semver-minor' ||
          steps.metadata.outputs.update-type == 'version-update:semver-major'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_URL: ${{ github.event.pull_request.html_url }}
        run: |
          if gh pr view "$PR_URL" --json autoMergeRequest --jq '.autoMergeRequest != null' | grep -q true; then
            echo "Auto-merge is already enabled."
            exit 0
          fi

          gh pr merge --auto --merge "$PR_URL"