name: Fix README

on:
  workflow_dispatch:

permissions:
  contents: write

jobs:
  fix:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout (sparse - readme + json metadata only)
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            README.md
            assets/*.json
          sparse-checkout-cone-mode: false
          fetch-depth: 1

      - name: Configure Git
        run: |
          git config user.name 'github-actions[bot]'
          git config user.email 'github-actions[bot]@users.noreply.github.com'

      - name: Rebuild README from JSON metadata
        run: |
          python3 << 'PYEOF'
          import os, json, glob

          CDN_BASE = "https://raw.githubusercontent.com/yapude/wallpapers/main/assets"

          header = "# Wallpaper Archive\n\nAutomated archive of wallpapers to bypass Cloudflare and prevent dead links.\n\n## Gallery\n\n| Preview | Title | Tags |\n| --- | --- | --- |\n"

          rows = []
          count = 0
          errors = 0

          for json_file in sorted(glob.glob("assets/*.json")):
              try:
                  with open(json_file, "r", encoding="utf-8") as f:
                      item = json.load(f)

                  ext = "png" if ".png" in item.get("download_url", "") else "jpg"
                  item_id = item.get("id", "")
                  filename = f"{item_id}.{ext}"
                  cdn_url = f"{CDN_BASE}/{filename}"

                  title = item.get("title", "Wallpaper")
                  tags = ", ".join(item.get("tags", []))

                  row = f'| <img src="{cdn_url}" width="200"> | **{title}**<br>[Download]({cdn_url}) | {tags} |\n'
                  rows.append((item_id, row))
                  count += 1
              except Exception as e:
                  errors += 1

          rows.sort(key=lambda x: x[0])

          chunk_size = 100000
          
          for i in range(0, len(rows), chunk_size):
              chunk = rows[i:i + chunk_size]
              filename = "README.md" if i == 0 else f"README{(i//chunk_size) + 1}.md"
              with open(filename, "w", encoding="utf-8") as f:
                  f.write(header)
                  for _, row in chunk:
                      f.write(row)

          print(f"Rebuilt README with {count} wallpapers ({errors} errors) across {len(rows)//chunk_size + 1} files")
          PYEOF

      - name: Commit and Push
        run: |
          git add --sparse README*.md
          git diff --cached --quiet && echo "no changes" || (git commit -m "fix: rebuild readme from archive metadata [skip ci]" && git push)