name: Dependabot Auto Merge

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

permissions:
  contents: write
  pull-requests: write

jobs:
  enable-auto-merge:
    if: github.actor == 'dependabot[bot]'
    runs-on: ubuntu-latest
    steps:
      - name: Fetch Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v2
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: Approve patch and minor updates
        if: |
          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
          steps.metadata.outputs.update-type == 'version-update:semver-minor'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_URL: ${{ github.event.pull_request.html_url }}
        run: gh pr review "$PR_URL" --approve --body "Auto-approved for safe Dependabot patch/minor update."

      - name: Enable auto-merge after checks pass
        if: |
          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
          steps.metadata.outputs.update-type == 'version-update:semver-minor'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_URL: ${{ github.event.pull_request.html_url }}
        run: gh pr merge "$PR_URL" --auto --squash