205 lines
8.6 KiB
Markdown
205 lines
8.6 KiB
Markdown
# Epic 1: Foundation & Core YouTube Integration
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## Epic Overview
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**Goal**: Establish the foundational infrastructure and core YouTube integration capabilities that all subsequent features will build upon. This epic delivers a functional system that can accept YouTube URLs, extract transcripts, and display them through a basic but polished web interface.
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**Priority**: Critical - Must be completed before Epic 2
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**Epic Dependencies**: None (foundational epic)
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**Estimated Complexity**: High (foundational setup)
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## Epic Success Criteria
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Upon completion of this epic, the YouTube Summarizer will:
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1. **Fully Operational Development Environment**
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- Single-command Docker setup
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- Hot-reload for both frontend and backend
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- Automated code quality enforcement
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2. **Core YouTube Processing Capability**
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- Accept all standard YouTube URL formats
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- Extract transcripts with fallback mechanisms
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- Handle error cases gracefully with user guidance
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3. **Basic User Interface**
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- Clean, responsive web interface
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- Real-time processing feedback
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- Mobile-friendly design
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4. **Production-Ready Foundation**
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- Comprehensive testing framework
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- CI/CD pipeline
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- Documentation and setup guides
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## Stories in Epic 1
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### Story 1.1: Project Setup and Infrastructure ✅ COMPLETED
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**As a** developer
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**I want** a fully configured project with all necessary dependencies and development tooling
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**So that** the team can begin development with consistent environments and automated quality checks
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#### Acceptance Criteria
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1. FastAPI application structure created with proper package organization (api/, services/, models/, utils/)
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2. Development environment configured with hot-reload, debugging, and environment variable management
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3. Docker configuration enables single-command local development startup
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4. Pre-commit hooks enforce code formatting (Black), linting (Ruff), and type checking (mypy)
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5. GitHub Actions workflow runs tests and quality checks on every push
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6. README includes clear setup instructions and architecture overview
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**Status**: Story created and validated
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**File**: `docs/stories/1.1.project-setup-infrastructure.md`
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### Story 1.2: YouTube URL Validation and Parsing
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**As a** user
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**I want** the system to accept any valid YouTube URL format
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**So that** I can paste URLs directly from my browser without modification
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#### Acceptance Criteria
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1. System correctly parses video IDs from youtube.com/watch?v=, youtu.be/, and embed URL formats
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2. Invalid URLs return clear error messages specifying the expected format
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3. System extracts and validates video IDs are exactly 11 characters
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4. Playlist URLs are detected and user is informed they're not yet supported
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5. URL validation happens client-side for instant feedback and server-side for security
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**Status**: ✅ Story created and ready for development
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**Story File**: [`1.2.youtube-url-validation-parsing.md`](../stories/1.2.youtube-url-validation-parsing.md)
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**Dependencies**: Story 1.1 (Project Setup)
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### Story 1.3: Transcript Extraction Service
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**As a** user
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**I want** the system to automatically retrieve video transcripts
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**So that** I can get summaries without manual transcription
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#### Acceptance Criteria
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1. Successfully retrieves transcripts using youtube-transcript-api for videos with captions
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2. Falls back to auto-generated captions when manual captions unavailable
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3. Returns clear error message for videos without any captions
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4. Extracts metadata including video title, duration, channel name, and publish date
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5. Handles multiple languages with preference for English when available
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6. Implements retry logic with exponential backoff for transient API failures
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**Status**: ✅ Story created and ready for development
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**Story File**: [`1.3.transcript-extraction-service.md`](../stories/1.3.transcript-extraction-service.md)
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**Dependencies**: Story 1.2 (URL Validation)
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### Story 1.4: Basic Web Interface
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**As a** user
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**I want** a clean web interface to input URLs and view transcripts
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**So that** I can interact with the system through my browser
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#### Acceptance Criteria
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1. Landing page displays prominent URL input field with placeholder text
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2. Submit button is disabled until valid URL is entered
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3. Loading spinner appears during transcript extraction with elapsed time counter
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4. Extracted transcript displays in scrollable, readable format with timestamps
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5. Error messages appear inline with suggestions for resolution
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6. Interface is responsive and works on mobile devices (320px minimum width)
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**Status**: ✅ Story created and ready for development
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**Story File**: [`1.4.basic-web-interface.md`](../stories/1.4.basic-web-interface.md)
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**Dependencies**: Story 1.3 (Transcript Extraction)
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### Story 1.5: Video Download and Storage Service
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**As a** user
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**I want** the system to download and store YouTube videos locally
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**So that** I can process videos offline, build a personal archive, and get better transcription quality
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#### Acceptance Criteria
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1. System downloads videos using yt-dlp with configurable quality settings
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2. Audio is automatically extracted from videos for transcription
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3. Videos are stored in organized directory structure by video ID
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4. Download progress is tracked and displayed in real-time
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5. Duplicate downloads are prevented through cache checking
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6. Storage management enforces size limits and cleanup options
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7. Service integrates seamlessly with transcript extraction
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**Status**: 📋 Story created and ready for development
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**Story File**: [`1.5.video-download-storage-service.md`](../stories/1.5.video-download-storage-service.md)
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**Dependencies**: Story 1.1 (Project Setup), Story 1.2 (URL Validation)
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## Technical Architecture Context
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### Technology Stack for Epic 1
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- **Backend**: FastAPI + Python 3.11+ with async support
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- **Frontend**: React 18 + TypeScript + shadcn/ui + Tailwind CSS
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- **Database**: SQLite for development (simple setup)
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- **Deployment**: Docker Compose for self-hosted deployment
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- **Testing**: pytest (backend) + Vitest (frontend)
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- **Code Quality**: Black, Ruff, mypy, ESLint, Prettier
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### Key Architecture Components
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1. **Project Structure**: Modular monolith with clear service boundaries
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2. **API Design**: RESTful endpoints with OpenAPI documentation
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3. **Error Handling**: Comprehensive error types with recovery guidance
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4. **Development Workflow**: Hot-reload, automated testing, pre-commit hooks
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## Non-Functional Requirements for Epic 1
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### Performance
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- Development environment starts in under 60 seconds
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- Hot-reload responds to changes within 2 seconds
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- URL validation provides instant client-side feedback
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### Security
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- Input sanitization for all user inputs
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- CORS configuration for development environment
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- Environment variable management for sensitive data
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### Reliability
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- Comprehensive error handling with user-friendly messages
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- Fallback mechanisms for transcript extraction
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- Health checks for all services
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### Usability
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- Self-documenting setup process
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- Clear error messages with actionable suggestions
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- Responsive design from 320px to desktop
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## Definition of Done for Epic 1
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- [ ] All 5 stories completed and validated
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- [ ] Docker Compose starts entire development environment
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- [ ] User can input YouTube URL and see extracted transcript
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- [ ] All tests passing with >80% coverage
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- [ ] CI/CD pipeline running successfully
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- [ ] Documentation complete with troubleshooting guide
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- [ ] Architecture validated by developer implementation
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## Risks and Mitigation
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### Technical Risks
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1. **YouTube API Changes**: Use multiple transcript sources (youtube-transcript-api + yt-dlp)
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2. **Development Complexity**: Comprehensive documentation and automated setup
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3. **Performance Issues**: Early optimization and monitoring
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### Project Risks
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1. **Scope Creep**: Strict acceptance criteria and story validation
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2. **Technical Debt**: Automated code quality enforcement
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3. **Documentation Lag**: Documentation as part of Definition of Done
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## Success Metrics
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### Technical Metrics
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- **Setup Time**: < 5 minutes from clone to running application
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- **Test Coverage**: > 80% backend, > 70% frontend
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- **Code Quality**: All automated checks passing
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- **Performance**: Transcript extraction < 10 seconds for typical video
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### User Experience Metrics
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- **URL Validation**: Instant feedback for invalid URLs
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- **Error Handling**: Clear recovery guidance for all error states
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- **Mobile Support**: Full functionality on mobile devices
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- **Developer Experience**: Hot-reload and debugging working smoothly
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---
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**Epic Status**: In Progress (Story 1.1 created and validated)
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**Next Action**: Create Story 1.2 (URL Validation and Parsing)
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**Epic Owner**: Bob (Scrum Master)
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**Last Updated**: 2025-01-25 |