name: Check channels changed in PR

on:
  pull_request:
    paths:
      - 'lists/**.md'

jobs:
  check-pr-channels:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Setup Node
        uses: actions/setup-node@v6
        with:
          node-version: "20.10.x"

      - name: Extract added/changed channel links from the PR diff
        run: |
          git fetch origin "${{ github.event.pull_request.base.sha }}" --depth=1 || true
          python3 - "${{ github.event.pull_request.base.sha }}" <<'PYEOF'
          import re, subprocess, sys

          base = sys.argv[1]
          diff = subprocess.run(
              ["git", "diff", "--unified=0", base, "HEAD", "--", "lists/*.md"],
              capture_output=True, text=True
          ).stdout

          rows = []
          for line in diff.splitlines():
              if not line.startswith('+') or line.startswith('+++'):
                  continue
              content = line[1:]
              m = re.search(r'\|\s*([^|]+?)\s*\|\s*\[(?:>|x)\]\(([^)]*)\)', content)
              if m:
                  name = m.group(1).strip() or "Unnamed channel"
                  url = m.group(2).strip()
                  if url.startswith('http'):
                      rows.append((name, url))

          with open('pr_test.m3u8', 'w') as f:
              f.write('#EXTM3U\n')
              for name, url in rows:
                  f.write(f'#EXTINF:-1,{name}\n{url}\n')

          print(f'Found {len(rows)} channel link(s) added or changed in this PR.')
          PYEOF

      - name: Check the PR's changed links
        if: success()
        run: |
          if [ ! -s pr_test.m3u8 ] || [ "$(grep -c '^#EXTINF' pr_test.m3u8 || true)" = "0" ]; then
            {
              echo "## PR channel check"
              echo ""
              echo "No new or modified stream links (\`[>](...)\` / \`[x](...)\`) were found in this PR's diff — nothing to check."
            } >> "$GITHUB_STEP_SUMMARY"
            exit 0
          fi

          npm install -g iptv-checker || true
          sudo apt-get update && sudo apt-get install -y ffmpeg
          mkdir -p pr_output
          iptv-checker -o pr_output -p 20 -t 20000 -r 1 ./pr_test.m3u8 || true

          total=$(grep -c '^#EXTINF' pr_test.m3u8 || echo 0)
          online=$(grep -c '^#EXTINF' pr_output/online.m3u 2>/dev/null || echo 0)
          failed=$(grep -c '^#EXTINF' pr_output/failed.m3u 2>/dev/null || echo 0)

          {
            echo "## PR channel check"
            echo ""
            echo "Checked $total link(s) added or changed by this PR:"
            echo "- ✅ Online: $online"
            echo "- ❌ Failed: $failed"
            if [ "$failed" -gt 0 ]; then
              echo ""
              echo "### Failed links"
              echo '```'
              grep '^#EXTINF\|^http' pr_output/failed.m3u
              echo '```'
              echo ""
              echo "_A failed check here doesn't automatically mean the PR is wrong — some channels are geo-blocked and only work from within their own country, which this CI runner isn't. Use your judgment._"
            fi
          } >> "$GITHUB_STEP_SUMMARY"