name: Check labels

on:
  pull_request:
    types: [labeled, opened, synchronize, unlabeled]

jobs:
  check-labels:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Pull image
        env:
          IMAGE: paritytech/ruled_labels:0.3.2
        run: docker pull $IMAGE

      - name: Check labels
        env:
          IMAGE: paritytech/ruled_labels:0.3.2
          MOUNT: /work
          GITHUB_PR: ${{ github.event.pull_request.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          API_BASE: https://api.github.com/repos
          REPO: ${{ github.repository }}
          RULES_PATH: scripts/ci/ruled_labels
          CHECK_SPECS: specs.yaml
        run: |
          echo "REPO: ${REPO}"
          echo "GITHUB_PR: ${GITHUB_PR}"

          # Fetch the labels for the PR under test
          labels=$( curl -H "Authorization: token ${GITHUB_TOKEN}" -s "$API_BASE/${REPO}/pulls/${GITHUB_PR}" | jq '.labels | .[] | .name' | tr "\n" ",")

          if [ -z "${labels}" ]; then
            echo "No labels found. Please add labels A, B and C labels"
            exit 1
          fi

          labels_args=${labels: :-1}
          printf "Checking labels: %s\n" "${labels_args}"

          # Prevent the shell from splitting labels with spaces
          IFS=","

          # --dev is more useful to debug mode to debug
          docker run --rm -i -v $PWD/${RULES_PATH}/:$MOUNT $IMAGE check $MOUNT/$CHECK_SPECS --labels ${labels_args} --dev --tags PR