# S3 Music Storage Implementation Summary

## 🎯 What Was Implemented

This implementation adds S3-compatible storage for music files with browser playback capabilities to the Rekordbox Reader application. The feature is implemented in the `feature/s3-storage` branch.

## 🏗️ Backend Implementation

### New Services
1. **S3Service** (`src/services/s3Service.ts`)
   - Handles file upload/download/delete operations
   - Generates presigned URLs for secure access
   - Manages S3 bucket operations
   - Supports MinIO and AWS S3

2. **AudioMetadataService** (`src/services/audioMetadataService.ts`)
   - Extracts metadata from audio files (artist, album, title, duration, etc.)
   - Validates audio file formats
   - Provides utility functions for formatting

### New Models
3. **MusicFile Model** (`src/models/MusicFile.ts`)
   - MongoDB schema for music file metadata
   - Links to existing Song model for Rekordbox integration
   - Includes search indexes for performance

### New API Routes
4. **Music Routes** (`src/routes/music.ts`)
   - `POST /api/music/upload` - Upload single music file
   - `POST /api/music/batch-upload` - Upload multiple files
   - `GET /api/music/:id/stream` - Get streaming URL
   - `GET /api/music/:id/presigned` - Get presigned URL
   - `GET /api/music/:id/metadata` - Get file metadata
   - `GET /api/music` - List files with search/filter
   - `DELETE /api/music/:id` - Delete file
   - `POST /api/music/:id/link-song/:songId` - Link to Rekordbox song

### Infrastructure
5. **Docker Compose Updates**
   - Added MinIO service for local S3-compatible storage
   - Configured MinIO client for automatic bucket setup
   - Updated environment variables for S3 configuration

## 🎨 Frontend Implementation

### New Components
1. **MusicUpload** (`src/components/MusicUpload.tsx`)
   - Drag & drop file upload interface
   - Progress indicators for uploads
   - File validation (audio formats only)
   - Batch upload support

2. **MusicPlayer** (`src/components/MusicPlayer.tsx`)
   - HTML5 audio player with custom controls
   - Playback controls (play, pause, seek, volume)
   - Skip forward/backward buttons
   - Metadata display (title, artist, album)

3. **MusicStorage** (`src/pages/MusicStorage.tsx`)
   - Complete music management interface
   - Tabbed interface (Upload, Library, Player)
   - File library with grid view
   - Integration with upload and player components

## 🚀 How to Test

### 1. Start the Infrastructure
```bash
# Start MinIO and MongoDB
docker-compose -f docker-compose.dev.yml up -d

# Verify MinIO is running
docker ps
```

### 2. Access MinIO Console
- URL: http://localhost:9001
- Username: `minioadmin`
- Password: `minioadmin`

### 3. Start the Backend
```bash
cd packages/backend
npm install
npm run dev
```

### 4. Test S3 Connection
```bash
cd packages/backend
node test-s3.js
```

### 5. Start the Frontend
```bash
cd packages/frontend
npm install
npm run dev
```

### 6. Test the Application
1. Navigate to the Music Storage page
2. Upload some music files (MP3, WAV, etc.)
3. View uploaded files in the library
4. Play files using the music player
5. Test file deletion

## 📡 API Testing

### Test Health Endpoint
```bash
curl http://localhost:3000/api/health
```

### Test File Upload
```bash
curl -X POST -F "file=@test.mp3" http://localhost:3000/api/music/upload
```

### Test File Listing
```bash
curl http://localhost:3000/api/music
```

### Test Streaming
```bash
curl http://localhost:3000/api/music/:id/stream
```

## 🔧 Configuration

### Environment Variables
Create `.env` file in `packages/backend/`:
```env
MONGODB_URI=mongodb://localhost:27017/rekordbox
S3_ENDPOINT=http://localhost:9000
S3_ACCESS_KEY_ID=minioadmin
S3_SECRET_ACCESS_KEY=minioadmin
S3_BUCKET_NAME=music-files
S3_REGION=us-east-1
PORT=3000
NODE_ENV=development
```

## 🎵 Supported Features

### Audio Formats
- MP3 (.mp3)
- WAV (.wav)
- FLAC (.flac)
- AAC (.aac, .m4a)
- OGG (.ogg)
- WMA (.wma)
- Opus (.opus)

### File Operations
- Upload (single and batch)
- Download/streaming
- Delete
- Metadata extraction
- Search and filtering

### Playback Features
- Browser-based audio streaming
- Custom player controls
- Volume control
- Seek functionality
- Auto-play next track

## 🔒 Security Features

- File type validation
- File size limits (100MB per file)
- Presigned URL generation for secure access
- Environment variable configuration
- Input sanitization

## 📊 Performance Optimizations

- Database indexing for search performance
- Pagination for large file lists
- Streaming audio for efficient playback
- Memory-efficient file handling with multer

## 🔄 Integration Points

### Rekordbox Integration
- MusicFile model links to existing Song model
- API endpoint to link uploaded files to Rekordbox songs
- Maintains playlist relationships

### Future Integration Opportunities
- Playlist streaming
- Audio visualization
- Advanced search and filtering
- User authentication

## 🐛 Known Issues & Limitations

1. **Multer Version**: Updated to v2.0.0-rc.3 to fix security vulnerabilities
2. **File Size**: Limited to 100MB per file (configurable)
3. **Browser Support**: Requires modern browsers with HTML5 audio support
4. **CORS**: May need CORS configuration for production deployment

## 🚀 Next Steps

### Immediate Improvements
1. Add error handling for network issues
2. Implement retry logic for failed uploads
3. Add file compression options
4. Implement audio format conversion

### Advanced Features
1. Audio visualization (waveform display)
2. Playlist management with music files
3. User authentication and access control
4. CDN integration for production
5. Mobile app support

### Production Deployment
1. Configure AWS S3 for production
2. Set up CloudFront CDN
3. Implement monitoring and logging
4. Add backup and disaster recovery
5. Performance testing and optimization

## 📚 Documentation

- **S3_STORAGE_README.md**: Comprehensive feature documentation
- **API Documentation**: Available in the music routes
- **Component Documentation**: Available in component files

## 🎉 Success Criteria

✅ S3-compatible storage integration  
✅ Audio file upload and management  
✅ Browser-based music playback  
✅ Metadata extraction and display  
✅ File search and filtering  
✅ Integration with existing Rekordbox functionality  
✅ Docker-based development environment  
✅ Comprehensive error handling  
✅ Security best practices  

The implementation successfully provides a complete S3 storage solution for music files with browser playback capabilities, ready for testing and further development.