name: Dependabot Auto Merge

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened

permissions:
  contents: write
  pull-requests: write

concurrency:
  group: dependabot-auto-merge-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  auto_merge:
    if: github.event.pull_request.user.login == 'dependabot[bot]'
    runs-on: ubuntu-latest
    steps:
      - name: Fetch Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@21025c705c08248db411dc16f3619e6b5f9ea21a
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Keep major updates for manual review
        if: steps.metadata.outputs.update-type == 'version-update:semver-major'
        run: echo "Major version update detected. Auto-merge is intentionally disabled."