name: Watch Platform Updates

on:
  schedule:
    - cron: "0 6 * * 1"  # Every Monday at 06:00 UTC
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write
  issues: write

jobs:
  scrape-and-update:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - uses: actions/setup-python@v6
        with:
          python-version: "3.12"

      - name: Install dependencies
        run: pip install pyyaml

      - name: Regenerate platform configs from live sources
        run: |
          python3 -c "
          import sys, yaml
          sys.path.insert(0, 'scripts')

          def str_representer(dumper, data):
              if any(c in data for c in '()[]{}:#'):
                  return dumper.represent_scalar('tag:yaml.org,2002:str', data, style='\"')
              return dumper.represent_scalar('tag:yaml.org,2002:str', data)
          yaml.add_representer(str, str_representer)

          # Regenerate retroarch.yml from live System.dat + core-info
          from scraper.libretro_scraper import Scraper as LS
          config = LS().generate_platform_yaml()
          with open('platforms/retroarch.yml', 'w') as f:
              yaml.dump(config, f, default_flow_style=False, allow_unicode=True, sort_keys=False)
          print(f'RetroArch: {len(config[\"systems\"])} systems, version={config[\"version\"]}')

          # Regenerate batocera.yml from live batocera-systems
          from scraper.batocera_scraper import Scraper as BS
          config = BS().generate_platform_yaml()
          with open('platforms/batocera.yml', 'w') as f:
              yaml.dump(config, f, default_flow_style=False, allow_unicode=True, sort_keys=False)
          print(f'Batocera: {len(config[\"systems\"])} systems, version={config[\"version\"]}')
          "

      - name: Auto-fetch missing BIOS files
        run: |
          python scripts/generate_db.py --bios-dir bios --output database.json
          python scripts/auto_fetch.py --all 2>&1 | tee /tmp/fetch_report.txt || true

      - name: Deduplicate BIOS files
        run: python scripts/dedup.py

      - name: Regenerate database and documentation
        run: |
          python scripts/generate_db.py --force --bios-dir bios --output database.json
          python scripts/generate_readme.py --db database.json --platforms-dir platforms

      - name: Check for changes
        id: check
        run: |
          if git diff --quiet && [ -z "$(git ls-files --others --exclude-standard)" ]; then
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
          else
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
            echo "Changes detected:"
            git diff --stat
            git ls-files --others --exclude-standard | head -20
          fi

      - name: Create or update PR
        if: steps.check.outputs.has_changes == 'true'
        run: |
          DATE=$(date +%Y-%m-%d)
          BRANCH="auto/update-platforms-${DATE}"

          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          git checkout -b "$BRANCH"
          git add -A
          git commit -m "chore: auto-update platform data ($DATE)"
          git push origin "$BRANCH" --force

          existing_pr=$(gh pr list --head "$BRANCH" --json number --jq '.[0].number' 2>/dev/null || true)

          if [ -n "$existing_pr" ] && [ "$existing_pr" != "null" ]; then
            echo "Updating existing PR #${existing_pr}"
          else
            gh pr create \
              --title "Auto-update: Platform data ($DATE)" \
              --body "$(cat <<'EOF'
          ## Automated Platform Update

          This PR was automatically generated by the weekly platform watch.

          ### What changed
          - Scraped latest BIOS requirements from libretro System.dat and batocera-systems
          - Auto-fetched new BIOS files from public sources
          - Deduplicated and regenerated database + documentation

          ### Review Checklist
          - [ ] New BIOS files are valid
          - [ ] Platform configs are correct
          - [ ] database.json and README look good

          ---
          *Auto-generated by [watch-updates](../../actions/workflows/watch-updates.yml)*
          EOF
          )" \
              --label "automated,platform-update"
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}