# 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** | 🟢 Ready for Development | 100% Stories Created (4/4) | Story 1.1 ✅ Complete, Stories 1.2-1.4 📋 Ready | Begin Story 1.2 Implementation |
| **Epic 2** | ⏸️ Blocked | 0% (0/5) | None | Wait for Epic 1 |
| **Epic 3** | ⏸️ Blocked | 0% (0/5) | None | Wait for Epic 2 |

**Overall Project Progress**: 8% (1/14 stories completed)

---

## 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 | 📋 **CREATED** | [`1.2.youtube-url-validation-parsing.md`](../stories/1.2.youtube-url-validation-parsing.md) | Story 1.1 |
| **1.3** | Transcript Extraction Service | 📋 **CREATED** | [`1.3.transcript-extraction-service.md`](../stories/1.3.transcript-extraction-service.md) | Story 1.2 |
| **1.4** | Basic Web Interface | 📋 **CREATED** | [`1.4.basic-web-interface.md`](../stories/1.4.basic-web-interface.md) | Story 1.3 |

### Key Deliverables
- ✅ Complete development environment with Docker
- ⏳ YouTube URL processing and validation
- ⏳ Transcript extraction with fallbacks
- ⏳ Basic responsive web interface

### 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**: Blocked - Waiting for Epic 1 completion

### Stories in Epic 2

| Story | Title | Status | File | Dependencies |
|-------|-------|--------|------|--------------|
| **2.1** | Single AI Model Integration | ⏸️ Blocked | - | Story 1.4 |
| **2.2** | Summary Generation Pipeline | ⏸️ Blocked | - | Story 2.1 |
| **2.3** | Caching System Implementation | ⏸️ Blocked | - | Story 2.2 |
| **2.4** | Multi-Model Support | ⏸️ Blocked | - | Story 2.3 |
| **2.5** | Export Functionality | ⏸️ Blocked | - | 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 API

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

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

**📊 Status**: Blocked - Waiting for Epic 2 completion

### Stories in Epic 3

| Story | Title | Status | File | Dependencies |
|-------|-------|--------|------|--------------|
| **3.1** | User Authentication System | ⏸️ Blocked | - | Story 2.5 |
| **3.2** | Summary History Management | ⏸️ Blocked | - | Story 3.1 |
| **3.3** | Batch Processing | ⏸️ Blocked | - | Story 3.2 |
| **3.4** | Real-time Updates | ⏸️ Blocked | - | Story 3.3 |
| **3.5** | API Endpoints | ⏸️ Blocked | - | Story 3.4 |

### Key Deliverables
- User registration and authentication (JWT-based)
- Persistent summary history with search
- Batch processing for multiple videos
- Real-time WebSocket progress updates
- Public API with SDK support

### 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

---

## Development Workflow

### Current Priority: Epic 1 Completion

**Next Steps**:
1. **Implement Story 1.2** (YouTube URL Validation and Parsing) ⬅️ **START HERE**
2. **Implement Story 1.3** (Transcript Extraction Service)
3. **Implement Story 1.4** (Basic Web Interface)
4. **Epic 1 Validation** (Complete integration testing)

### 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**: 2025-01-25  
**Project Owner**: Bob (Scrum Master)  
**Architecture Reference**: Winston (Architect)  
**Development Status**: Story 1.1 completed, ready for Story 1.2 creation