name: Check change note

permissions:
  pull-requests: read

on:
  pull_request_target:
    types: [labeled, unlabeled, opened, synchronize, reopened, ready_for_review]
    paths:
      - "*/ql/src/**/*.ql"
      - "*/ql/src/**/*.qll"
      - "*/ql/lib/**/*.ql"
      - "*/ql/lib/**/*.qll"
      - "*/ql/lib/**/*.yml"
      - "shared/**/*.ql"
      - "shared/**/*.qll"
      - "!**/experimental/**"
      - "!ql/**"
      - ".github/workflows/check-change-note.yml"

jobs:
  check-change-note:
    env: 
      REPO: ${{ github.repository }}
      PULL_REQUEST_NUMBER: ${{ github.event.number }}
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    runs-on: ubuntu-latest
    steps:

      - name: Fail if no change note found. To fix, either add one, or add the `no-change-note-required` label.
        if: |
          github.event.pull_request.draft == false &&
          !contains(github.event.pull_request.labels.*.name, 'no-change-note-required')
        run: |
          change_note_files=$(gh api "repos/$REPO/pulls/$PULL_REQUEST_NUMBER/files" --paginate --jq '.[].filename | select(test("/change-notes/.*[.]md$"))')
          
          if [ -z "$change_note_files" ]; then
            echo "No change note found. Either add one, or add the 'no-change-note-required' label."
            exit 1
          fi

          echo "Change notes found:"
          echo "$change_note_files"

      - name: Fail if the change note filename doesn't match the expected format. The file name must be of the form 'YYYY-MM-DD.md', 'YYYY-MM-DD-{title}.md', where '{title}' is arbitrary text, or released/x.y.z.md for released change-notes
        run: |
          bad_change_note_file_names=$(gh api "repos/$REPO/pulls/$PULL_REQUEST_NUMBER/files" --paginate --jq '[.[].filename | select(test("/change-notes/.*[.]md$"))][] | select((test("/change-notes/[0-9]{4}-[0-9]{2}-[0-9]{2}.*[.]md$") or test("/change-notes/released/[0-9]*[.][0-9]*[.][0-9]*[.]md$")) | not)')

          if [ -n "$bad_change_note_file_names" ]; then
            echo "The following change note file names are invalid:"
            echo "$bad_change_note_file_names"
            exit 1
          fi
