name: Link check

on:
  pull_request:
    branches: [master]
  workflow_dispatch:

concurrency:
  group: link-check-${{ github.ref }}
  cancel-in-progress: true

jobs:
  link-check:
    runs-on: ubuntu-latest
    timeout-minutes: 60
    env:
      PORT: 4000
      BASE_URL: http://localhost:4000

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: lts/*
          cache: npm

      - run: npm ci

      - name: Build CSS
        run: npm run build-css

      - name: Start Realm dev server
        run: |
          npx realm develop --port "$PORT" > realm.log 2>&1 &
          echo $! > realm.pid

      - name: Wait for server
        run: npx --yes wait-on "$BASE_URL" --timeout 180000

      - name: Crawl and check links
        run: |
          npx --yes linkinator@^6 "$BASE_URL" \
            --config linkinator.config.json \
            --format csv > linkinator-report.csv

      - name: Stop Realm server
        if: always()
        run: |
          if [ -f realm.pid ]; then kill "$(cat realm.pid)" 2>/dev/null || true; fi

      - name: Upload report
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: link-check-report
          path: |
            linkinator-report.csv
            realm.log
          if-no-files-found: warn