name: Update themes index

on:
  push:
    branches: [gh-pages]
    paths:
      - 'themes/**'
      - '!themes/index.json'

jobs:
  update-index:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          ref: gh-pages

      - name: Regenerate themes/index.json
        run: |
          python3 - << 'EOF'
          import json, os
          themes_root = 'themes'
          result = {}
          for cat in sorted(os.listdir(themes_root)):
              cat_path = os.path.join(themes_root, cat)
              if not os.path.isdir(cat_path):
                  continue
              files = sorted(f for f in os.listdir(cat_path) if f.endswith('.yaml'))
              themes = [{'slug': cat + '/' + f, 'label': f[:-5].replace('-', ' ')} for f in files]
              if themes:
                  result[cat] = themes
          with open('themes/index.json', 'w') as fh:
              json.dump(result, fh, indent=2)
          total = sum(len(v) for v in result.values())
          print(f'Updated: {len(result)} categories, {total} themes')
          EOF

      - name: Commit and push
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add themes/index.json
          git diff --cached --quiet || git commit -m "Auto-update themes/index.json"
          git push