# Python Backend Rewrite Complete

## Summary
Successfully rewrote the Node.js/TypeScript backend to Python with VK Music integration.

## New Python Backend Structure
```
├── main.py                 # Entry point - FastAPI app with uvicorn
├── requirements.txt        # Python dependencies
├── setup.py               # Environment setup script
├── backend/
│   ├── __init__.py
│   ├── database.py        # SQLAlchemy models and database connection
│   ├── vkmusic.py         # VK Music API integration (replaced SoundCloud)
│   ├── api.py             # FastAPI routes and endpoints
│   └── bot.py             # Telegram bot functionality
├── Dockerfile             # Updated for Python
└── .env                   # Environment variables (created by setup.py)
```

## Key Changes Made
1. **Framework**: Express.js → FastAPI
2. **Music Service**: SoundCloud → VK Music (vk-api library)
3. **Database**: Direct PostgreSQL → SQLAlchemy ORM
4. **Bot**: node-telegram-bot-api → python-telegram-bot
5. **Audio Processing**: fluent-ffmpeg → subprocess + FFmpeg

## API Endpoints (Preserved)
- `GET /` - Serve main HTML with cache-busting
- `POST /api/search` - Search VK Music tracks
- `POST /api/convert` - Convert audio to MP3
- `POST /api/telegram-send` - Send audio via Telegram
- `GET /health` - Health check
- `GET /downloads/{filename}` - Serve MP3 files

## Environment Variables Required
- `DATABASE_URL` - PostgreSQL connection string
- `VK_LOGIN` - VK account login
- `VK_PASSWORD` - VK account password  
- `TELEGRAM_BOT_TOKEN` - Telegram bot token
- `WEB_APP_URL` - Web app URL for bot
- `PORT` - Server port (default: 8000)
- `HOST` - Server host (default: 0.0.0.0)

## Setup Instructions
1. Run `python setup.py` to initialize environment
2. Update `.env` file with actual credentials
3. Install dependencies: `pip install -r requirements.txt`
4. Start server: `python main.py`
5. Access API at: http://localhost:8000

## Docker Support
Updated Dockerfile uses Python 3.11-slim with ffmpeg support. Ready for containerized deployment.

## Next Steps
- Test VK Music integration with actual credentials
- Update frontend if needed to work with new Python API
- Deploy and test in production environment