name: changelog

on:
  # We need pull_request_target instead of pull_request because a write
  # repository token is needed to add a review to a PR. DO NOT BUILD
  # OR RUN UNTRUSTED CODE FROM PRs IN THIS ACTION
  pull_request_target:
    types: [opened, edited, synchronize]

permissions:
  pull-requests: write

jobs:
  check_changelog:
    # no need to check for dependency updates via dependabot
    # github.event.pull_request.user.login refers to PR author
    if: |
      github.event.pull_request.user.login != 'dependabot[bot]' &&
      github.event.pull_request.user.login != 'dependabot-preview[bot]'
    runs-on: ubuntu-latest
    env:
      NO_CHANGELOG: '[x] No CHANGELOG update needed'
    steps:
    - name: Get changed files
      id: files
      uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
    - name: check changelog updated
      id: changelog_updated
      env:
        PR_BODY: ${{ github.event.pull_request.body }}
        FILES: ${{ steps.files.outputs.modified }}
      run: |
        echo $FILES | grep -qF 'CHANGELOG.md' || echo $PR_BODY | grep -qiF "$NO_CHANGELOG"
    - name: Reject pull request if no CHANGELOG update
      if: ${{ always() && steps.changelog_updated.outcome == 'failure' }}
      uses: Ana06/automatic-pull-request-review@76aaf9b15b116a54e1da7a28a46f91fe089600bf # v0.2.0
      with:
        repo-token: ${{ secrets.GITHUB_TOKEN }}
        event: REQUEST_CHANGES
        body: "Please add bug fixes, new features, breaking changes and anything else you think is worthwhile mentioning to the `master (unreleased)` section of CHANGELOG.md. If no CHANGELOG update is needed add the following to the PR description: `${{ env.NO_CHANGELOG }}`"
        allow_duplicate: false
    - name: Dismiss previous review if CHANGELOG update
      uses: Ana06/automatic-pull-request-review@76aaf9b15b116a54e1da7a28a46f91fe089600bf # v0.2.0
      with:
        repo-token: ${{ secrets.GITHUB_TOKEN }}
        event: DISMISS
        body: "CHANGELOG updated or no update needed, thanks! :smile:"