name: Blocking labels

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
      - labeled
      - unlabeled
    branches:
      - dev
      - master

permissions:
  contents: read

jobs:
  check:
    name: Check for labels which block the Pull Request from being merged
    runs-on: ubuntu-latest
    steps:
      - name: Check for blocking labels
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const blockingLabels = [
              "wait for backend",
              "Needs UX",
              "Do Not Review",
              "Blocked",
              "has-parent",
            ];
            const prLabels = context.payload.pull_request.labels.map(
              (l) => l.name
            );
            const found = blockingLabels.filter((bl) => prLabels.includes(bl));
            if (found.length > 0) {
              const message = `This Pull Request is blocked by label${found.length > 1 ? "s" : ""}: ${found.join(", ")}`;
              await core.summary
                .addHeading(":no_entry_sign: Pull Request is blocked", 2)
                .addRaw(message)
                .write();
              core.setFailed(message);
            } else {
              await core.summary
                .addHeading(":white_check_mark: Pull Request is clear to merge after review", 2)
                .addRaw("This Pull Request is not blocked by any labels which prevent it from being merged.")
                .write();
            }