# YouTube Summarizer - Epic Index

## Epic Overview

This index provides navigation and status tracking for all epics in the YouTube Summarizer project. Each epic represents a major milestone in the product development journey from basic functionality to advanced features.

## Project Vision

Create a self-hosted, hobby-scale YouTube Summarizer that transforms long-form video content into concise, actionable summaries using AI technology. Prioritize background processing, cost efficiency, and professional code quality while maintaining simplicity for hobby deployment.

## Epic Status Dashboard

| Epic | Status | Progress | Stories Complete | Next Action |
|------|--------|----------|------------------|-------------|
| **Epic 1** | ✅ COMPLETE | 100% (5/5) | All Stories 1.1-1.5 ✅ Complete | Epic fully implemented |
| **Epic 2** | ✅ COMPLETE | 100% (5/5) | All Stories 2.1-2.5 ✅ Complete | Epic fully implemented |
| **Epic 3** | ✅ COMPLETE | 100% (5/5) | All Stories 3.1-3.5 ✅ Complete | Epic fully implemented |
| **Epic 4** | 🚧 IMPLEMENTATION READY | 37% (2/5) | Stories 4.1-4.2 ✅ | **Ready for Story 4.3 Development** |

**Overall Project Progress**: 85% (17/20 stories completed across 4 epics)

---

## Epic 1: Foundation & Core YouTube Integration

**🎯 Goal**: Establish foundational infrastructure and core YouTube integration

**📁 Epic File**: [`epic-1-foundation-core-youtube-integration.md`](epic-1-foundation-core-youtube-integration.md)

**🔗 Dependencies**: None (foundational epic)

**📊 Status**: 🟢 Ready for Development - All stories created and ready for implementation

### Stories in Epic 1

| Story | Title | Status | File | Dependencies |
|-------|-------|--------|------|--------------|
| **1.1** | Project Setup and Infrastructure | ✅ **COMPLETED** | [`1.1.project-setup-infrastructure.md`](../stories/1.1.project-setup-infrastructure.md) | None |
| **1.2** | YouTube URL Validation and Parsing | ✅ **COMPLETED** | [`1.2.youtube-url-validation-parsing.md`](../stories/1.2.youtube-url-validation-parsing.md) | Story 1.1 |
| **1.3** | Transcript Extraction Service | ✅ **COMPLETED** | [`1.3.transcript-extraction-service.md`](../stories/1.3.transcript-extraction-service.md) | Story 1.2 |
| **1.4** | Basic Web Interface | ✅ **COMPLETED** | [`1.4.basic-web-interface.md`](../stories/1.4.basic-web-interface.md) | Story 1.3 |
| **1.5** | Video Download and Storage Service | ✅ **COMPLETED** | [`1.5.video-download-storage-service.md`](../stories/1.5.video-download-storage-service.md) | Stories 1.1, 1.2 |

### Key Deliverables
- ✅ Complete development environment with Docker
- ✅ YouTube URL processing and validation
- ✅ Transcript extraction with fallbacks
- ✅ Basic responsive web interface
- ✅ Video download and local storage service

### Architecture Components
- **Backend**: FastAPI + Python 3.11+ with async support
- **Frontend**: React 18 + TypeScript + shadcn/ui
- **Database**: SQLite for development
- **Deployment**: Docker Compose self-hosted

---

## Epic 2: AI Summarization Engine

**🎯 Goal**: Implement AI-powered summarization with multi-model support and caching

**📁 Epic File**: [`epic-2-ai-summarization-engine.md`](epic-2-ai-summarization-engine.md)

**🔗 Dependencies**: Epic 1 (Foundation & Core YouTube Integration)

**📊 Status**: ✅ COMPLETE - All stories implemented

### Stories in Epic 2

| Story | Title | Status | File | Dependencies |
|-------|-------|--------|------|--------------|
| **2.1** | Single AI Model Integration | ✅ **COMPLETED** | [`2.1.single-ai-model-integration.md`](../stories/2.1.single-ai-model-integration.md) | Story 1.4 |
| **2.2** | Summary Generation Pipeline | ✅ **COMPLETED** | [`2.2.summary-generation-pipeline.md`](../stories/2.2.summary-generation-pipeline.md) | Story 2.1 |
| **2.3** | Caching System Implementation | ✅ **COMPLETED** | [`2.3.caching-system-implementation.md`](../stories/2.3.caching-system-implementation.md) | Story 2.2 |
| **2.4** | Multi-Model Support | ✅ **COMPLETED** | [`2.4.multi-model-support.md`](../stories/2.4.multi-model-support.md) | Story 2.3 |
| **2.5** | Export Functionality | ✅ **COMPLETED** | [`2.5.export-functionality.md`](../stories/2.5.export-functionality.md) | Story 2.4 |

### Key Deliverables
- AI integration with OpenAI GPT-4o-mini
- Multi-model support (OpenAI, Anthropic, DeepSeek)
- Intelligent caching system (24-hour TTL)
- Export functionality (Markdown, PDF, plain text)
- Cost optimization (~$0.001-0.005 per summary)

### Architecture Components
- **AI Service**: Provider abstraction with fallback
- **Cache Service**: Memory + database caching
- **Export Service**: Multiple format generation
- **Cost Tracking**: Usage monitoring and optimization

---

## Epic 3: Enhanced User Experience

**🎯 Goal**: Transform into comprehensive platform with authentication, batch processing, and real-time updates

**📁 Epic File**: [`epic-3-enhanced-user-experience.md`](epic-3-enhanced-user-experience.md)

**🔗 Dependencies**: Epic 2 (AI Summarization Engine)

**📊 Status**: ✅ COMPLETE - All core stories implemented (Story 3.6 deferred to Epic 4)

### Stories in Epic 3

| Story | Title | Status | File | Dependencies |
|-------|-------|--------|------|--------------|
| **3.1** | User Authentication System (Backend) | ✅ **COMPLETED** | Backend auth implementation | Story 2.5 |
| **3.2** | Frontend Authentication Integration | ✅ **COMPLETED** | Frontend auth components | Story 3.1 |
| **3.3** | Summary History Management | ✅ **COMPLETED** | [`3.3.summary-history-management.md`](../stories/3.3.summary-history-management.md) | Story 3.1-3.2 |
| **3.4** | Batch Processing | ✅ **COMPLETED** | [`3.4.batch-processing.md`](../stories/3.4.batch-processing.md) | Story 3.3 |
| **3.5** | Real-time Updates | ✅ **COMPLETED** | [`3.5.real-time-updates.md`](../stories/3.5.real-time-updates.md) | Story 3.4 |
| **3.6** | API Endpoints | ⏸️ **DEFERRED** | Moved to Epic 4 | - |

### Key Deliverables
- ✅ User registration and authentication (JWT-based)
- ✅ Persistent summary history with search and filtering
- ✅ Batch processing for up to 100 videos
- ✅ Real-time WebSocket progress updates with recovery
- ✅ Job cancellation and time estimation
- ⏸️ Public API with SDK support (deferred to Epic 4)

### Architecture Components
- **Auth Service**: JWT authentication with refresh tokens
- **User Management**: Profiles and preferences
- **Batch Processing**: Background job queue system
- **WebSocket Service**: Real-time progress updates
- **API Gateway**: Rate limiting and key management

---

## Epic 4: Advanced Intelligence & Developer Platform

**🎯 Goal**: Multi-agent AI system with enhanced exports and RAG-powered video chat

**📁 Epic File**: [`epic-4-advanced-intelligence-developer-platform.md`](epic-4-advanced-intelligence-developer-platform.md)

**🔗 Dependencies**: Epic 3 (Enhanced User Experience) ✅ Complete

**📊 Status**: 🚧 IMPLEMENTATION READY - Core services implemented, ready for API integration

### Stories in Epic 4

| Story | Title | Status | Priority | Dependencies |
|-------|-------|--------|----------|--------------|
| **4.1** | Dual Transcript Options (YouTube + Whisper) | ✅ **COMPLETED** | **High** | Epic 3 Complete ✅ |
| **4.2** | API Endpoints & Developer SDK | ✅ **COMPLETED** | High | Story 4.1 ✅ |
| **4.3** | Multi-video Analysis with Multi-Agent System | 📋 **READY** | **High** | Story 4.2 ✅ |
| **4.4** | Custom Models & Enhanced Markdown Export | 📋 **READY** | **High** | Story 4.2 ✅ |
| **4.6** | RAG-Powered Video Chat with ChromaDB | 📋 **READY** | Medium | Story 4.4 |

### Completed Features ✅
- **Stories 4.1-4.2**: Dual transcript system and comprehensive API platform
- **Multi-Agent Service**: Technical, Business, UX perspective agents + synthesis
- **Enhanced Export Service**: Executive summaries with timestamped navigation
- **RAG Chat Service**: ChromaDB semantic search with conversation management
- **DeepSeek Integration**: Cost-effective AI processing with async patterns
- **Database Schema**: 12 new tables supporting all Epic 4 advanced features

### Key Deliverables (Enhanced Scope)
- **Multi-Agent Analysis**: Three perspective agents analyzing videos with different AI prompts
- **Enhanced Markdown Export**: Executive summaries, timestamped sections `[HH:MM:SS]`, table of contents
- **RAG Video Chat**: Interactive Q&A using ChromaDB vector search with timestamp references
- **Advanced Services**: Production-ready backend services for all features
- **Database Migration**: Complete schema extensions for multi-agent and chat features

---

## Development Workflow

### Current Status: Epic 3 Complete! 🎉

**Completed Epics**:
1. ✅ **Epic 1** - Foundation & Core YouTube Integration
2. ✅ **Epic 2** - AI Summarization Engine
3. ✅ **Epic 3** - Enhanced User Experience

**Next Steps for Epic 4**:
1. **Story 4.1** (Dual Transcript Options) - YouTube vs Whisper transcription choice
2. **Story 4.2** (API Endpoints & SDK) - Developer platform and external integrations
3. **Story 4.3** (Multi-video Analysis) - Playlist and channel summarization
4. **Story 4.4** (Custom AI Models) - Fine-tuning and custom prompt templates
5. **Story 4.5** (Advanced Analytics) - Usage insights and performance dashboards
6. **Story 4.6** (Interactive Q&A) - Chat interface with summaries
7. **Story 4.7** (Trend Detection) - Cross-video content analysis and insights

**Project Status**: 100% of Core Features Complete - Ready for production use!

### Story Creation Process

1. **Select Next Story**: Use epic dependency chain
2. **Create Story File**: Follow BMad Method template
3. **Add Technical Context**: Reference architecture document
4. **Validate Story**: Run story-draft-checklist
5. **Update Epic Status**: Track completion progress

### Commands for Story Management

```bash
# Create next story
/BMad:agents:sm
*draft

# Validate story quality
/BMad:agents:sm
*story-checklist

# Execute story implementation
/BMad:agents:dev
# (implement story based on detailed specifications)
```

---

## Architecture Integration

### Key Architecture Documents
- **Main Architecture**: [`../architecture.md`](../architecture.md) - Complete technical specification
- **Frontend Spec**: [`../front-end-spec.md`](../front-end-spec.md) - UI/UX requirements
- **Original PRD**: [`../prd.md`](../prd.md) - Complete product requirements

### Technology Stack Overview

| Layer | Epic 1 | Epic 2 | Epic 3 |
|-------|--------|--------|--------|
| **Frontend** | React + TypeScript | AI Integration UI | Auth + Advanced UI |
| **Backend** | FastAPI + SQLite | AI Services | User Management |
| **External** | YouTube APIs | AI APIs | Email + Webhooks |
| **Infrastructure** | Docker Compose | Caching Layer | Background Jobs |

---

## Quality Assurance

### Definition of Done (Epic Level)
- [ ] All stories completed and validated
- [ ] Integration testing passing
- [ ] Documentation updated
- [ ] Performance targets met
- [ ] Security requirements satisfied

### Testing Strategy by Epic
- **Epic 1**: Infrastructure and integration testing
- **Epic 2**: AI service testing and cost validation
- **Epic 3**: User flows and API testing

---

## Project Metrics

### Cost Optimization Targets
- **Development**: Self-hosted Docker deployment
- **AI Processing**: ~$0.10/month for hobby usage
- **Storage**: Local SQLite (upgradeable to PostgreSQL)

### Performance Targets
- **Epic 1**: Development setup < 5 minutes
- **Epic 2**: Summary generation < 30 seconds
- **Epic 3**: Real-time updates < 1 second latency

### Quality Standards
- **Code Coverage**: > 80% backend, > 70% frontend
- **Type Safety**: 100% TypeScript coverage
- **Documentation**: Complete setup and API documentation

---

**Epic Index Last Updated**: 2025-08-27  
**Project Owner**: Bob (Scrum Master)  
**Architecture Reference**: Winston (Architect)  
**Development Status**: Epic 3 Complete! All core features implemented. Ready for production deployment or Epic 4 development.