# YouTube Automation Project - PRD

## Project Overview
Implement automatic YouTube thumbnail population system for Directus media collection, providing seamless integration between YouTube content and CMS media management with fallback mechanisms and performance optimization.

## Goals and Success Metrics

### Primary Goals
- Automate YouTube thumbnail extraction and population
- Provide robust fallback mechanisms for API unavailability
- Integrate seamlessly with Directus media collections
- Support multiple thumbnail resolutions and preferences
- Enable optional local storage for performance and reliability

### Success Metrics
- 100% successful thumbnail extraction from valid YouTube URLs
- Sub-2 second response time for thumbnail population
- 99.9% uptime for thumbnail service
- Zero data loss during thumbnail operations
- Comprehensive error handling and recovery

## Technical Requirements

### Core Technology Stack
- **Backend**: Node.js/Python with YouTube Data API integration
- **Storage**: Local file system with TTL management
- **CMS Integration**: Directus hooks and API endpoints
- **Caching**: Redis for API response caching
- **Image Processing**: Sharp/ImageMagick for format conversion

### API Integration Requirements
- YouTube Data API v3 client implementation
- Authentication and quota management
- Rate limiting and circuit breaker patterns
- Exponential backoff for error recovery
- Comprehensive logging and monitoring

### Storage Requirements
- Configurable local storage directory
- TTL-based cache invalidation
- Disk space monitoring and cleanup
- Format conversion capabilities
- Backup and recovery mechanisms

## Features and Functionality

### Core Features
1. **YouTube URL Processing**
   - Support all YouTube URL formats (standard, short, embedded)
   - Video ID extraction with validation
   - URL parameter and timestamp handling
   - Playlist reference management
   - Edge case handling for malformed URLs

2. **Thumbnail Management**
   - Multiple resolution support (maxres, high, medium, default)
   - Configurable resolution priority hierarchy
   - Quality validation and fallback logic
   - Format conversion and optimization
   - Metadata extraction and storage

3. **API Integration**
   - YouTube Data API client with authentication
   - Rate limit handling and quota management
   - Circuit breaker for service outages
   - Response caching for performance
   - Comprehensive error handling

4. **Local Storage System**
   - Configurable storage directory structure
   - Video ID-based filename organization
   - TTL-based cache management
   - Disk space monitoring and alerts
   - Automatic cleanup and archiving

### Advanced Features
1. **Fallback Mechanisms**
   - Static URL pattern fallback when API fails
   - Image existence validation via HEAD requests
   - Multiple fallback resolution attempts
   - Graceful degradation for service outages

2. **Directus Integration**
   - Action hooks for automatic population
   - Custom field mapping and validation
   - Bulk operation support
   - Real-time updates and notifications

3. **Performance Optimization**
   - Intelligent caching strategies
   - Batch processing capabilities
   - Asynchronous operation handling
   - Resource utilization monitoring

## Implementation Phases

### Phase 1: Foundation (Week 1)
- YouTube URL parser implementation
- Video ID extraction and validation
- Configuration system design
- Basic logging and error handling

### Phase 2: API Integration (Week 2)
- YouTube Data API client development
- Authentication and credential management
- Rate limiting and circuit breaker implementation
- Response caching and optimization

### Phase 3: Storage System (Week 3)
- Local storage service implementation
- TTL management and cleanup
- Format conversion capabilities
- Performance monitoring and alerts

### Phase 4: Directus Integration (Week 4)
- Directus action hook implementation
- Field mapping and validation
- Bulk operation support
- Real-time update mechanisms

### Phase 5: Advanced Features (Week 5)
- Fallback mechanism implementation
- Performance optimization
- Comprehensive error handling
- Monitoring and alerting setup

### Phase 6: Testing and Deployment (Week 6)
- Unit and integration testing
- Load testing and performance validation
- Security audit and vulnerability assessment
- Production deployment and monitoring

## Technical Specifications

### Performance Requirements
- Thumbnail extraction: < 2 seconds per URL
- Batch processing: 100+ URLs per minute
- Cache hit ratio: > 80% for repeated requests
- Memory usage: < 512MB under normal load
- Disk usage: Configurable with automatic cleanup

### Reliability Requirements
- Service uptime: 99.9% availability
- Error recovery: Automatic retry with exponential backoff
- Data integrity: 100% accuracy for thumbnail URLs
- Fallback success: > 95% when primary API fails

### Security Requirements
- API key management and rotation
- Input validation and sanitization
- Rate limit enforcement
- Audit logging for all operations
- Secure credential storage

### Scalability Requirements
- Horizontal scaling support
- Load balancing capabilities
- Database connection pooling
- Caching layer optimization
- Resource monitoring and alerting

## Dependencies and Risks

### Dependencies
- YouTube Data API availability and quota
- Directus instance configuration and access
- Local file system storage availability
- Redis caching infrastructure (optional)
- Image processing library availability

### Technical Risks
- YouTube API quota exhaustion
- API service outages or changes
- Directus hook configuration complexity
- Storage space limitations
- Image processing performance bottlenecks

### Business Risks
- YouTube API pricing changes
- Terms of service violations
- Copyright and usage compliance
- Performance impact on CMS operations

### Mitigation Strategies
- Implement comprehensive fallback mechanisms
- Monitor API usage and implement quotas
- Regular backup and recovery testing
- Performance monitoring and optimization
- Legal compliance review and documentation

## Success Criteria
- All 8 implementation subtasks completed successfully
- Thumbnail extraction working for all supported URL formats
- Fallback mechanisms functional when primary API fails
- Directus integration seamless and reliable
- Performance benchmarks met or exceeded
- Comprehensive test coverage (>90%)
- Production deployment successful with monitoring

## Deliverables
1. YouTube URL parser with comprehensive format support
2. Configuration system for resolution preferences and settings
3. YouTube Data API client with resilience and error handling
4. Thumbnail resolution fallback logic implementation
5. Local storage service with TTL and cleanup management
6. Directus integration hooks and field population logic
7. Fallback mechanism for API unavailability scenarios
8. Comprehensive test suite and validation pipeline

## Configuration Options
- Resolution priority hierarchy (maxres > high > medium > default)
- YouTube API key and quota settings
- Local storage directory and TTL configuration
- Directus instance connection and authentication
- Caching settings and performance tuning
- Logging levels and monitoring endpoints

## Monitoring and Alerting
- API usage and quota monitoring
- Response time and performance metrics
- Error rate and failure tracking
- Storage usage and cleanup alerts
- Directus integration health checks
- Security and compliance monitoring