name: Check PRdoc

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

env:
  IMAGE: docker.io/paritytech/prdoc:v0.0.7
  API_BASE: https://api.github.com/repos
  REPO: ${{ github.repository }}
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  GITHUB_PR: ${{ github.event.pull_request.number }}
  ENGINE: docker
  PRDOC_DOC: https://github.com/paritytech/polkadot-sdk/blob/master/docs/contributor/prdoc.md

jobs:
  check-prdoc:
    runs-on: ubuntu-latest
    if: github.event.pull_request.number != ''
    steps:
      - name: Checkout repo
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 #v4.1.1
      # we cannot show the version in this step (ie before checking out the repo)
      # due to https://github.com/paritytech/prdoc/issues/15
      - name: Check if PRdoc is required
        id: get-labels
        run: |
          echo "Pulling $IMAGE"
          $ENGINE pull $IMAGE

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

          echo "Checking PRdoc version"
          $ENGINE run --rm -v $PWD:/repo $IMAGE --version

      - name: Early exit if PR is silent
        if: ${{ contains(steps.get-labels.outputs.labels, 'R0') }}
        run: |
          hits=$(find prdoc -name "pr_$GITHUB_PR*.prdoc" | wc -l)
          if (( hits > 0 )); then
            echo "PR detected as silent, but a PRDoc was found, checking it as information"
            $ENGINE run --rm -v $PWD:/repo $IMAGE check -n ${GITHUB_PR} || echo "Ignoring failure"
          else
            echo "PR detected as silent, no PRDoc found, exiting..."
          fi
          echo "If you want to add a PRDoc, please refer to $PRDOC_DOC"
          exit 0

      - name: PRdoc check for PR#${{ github.event.pull_request.number }}
        if: ${{ !contains(steps.get-labels.outputs.labels, 'R0') }}
        run: |
          echo "Checking for PR#${GITHUB_PR}"
          echo "You can find more information about PRDoc at $PRDOC_DOC"
          $ENGINE run --rm -v $PWD:/repo -e RUST_LOG=info $IMAGE check -n ${GITHUB_PR}

      - name: Validate prdoc for PR#${{ github.event.pull_request.number }}
        if: ${{ !contains(steps.get-labels.outputs.labels, 'R0') }}
        run: |
          echo "Validating PR#${GITHUB_PR}"
          python3 --version
          python3 -m pip install cargo-workspace==1.2.1
          python3 .github/scripts/check-prdoc.py Cargo.toml prdoc/pr_${GITHUB_PR}.prdoc