`tasks/prd-new-feature-for-watches.md`

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# Product Requirements Document: Omega Watch Price Tracking System

## 1. Introduction/Overview

The Omega Watch Price Tracking System is a web application that provides users with comprehensive price monitoring and historical data visualization for Omega watches. The system aggregates pricing data from multiple sources including official retailers, secondary market platforms, and auction houses to provide accurate market insights.

This feature will implement a complete refactoring of the component architecture and establish a robust testing framework while delivering core price tracking functionality for Omega timepieces.

**Target Users**: All users interested in Omega watch pricing data
**Priority**: High
**Tech Stack**: Next.js 16 + React 19

## 2. Goals

• Create a centralized price tracking system for Omega watches across multiple market sources
• Implement a scalable, feature-based component architecture
• Establish comprehensive unit testing coverage with Jest and React Testing Library
• Provide users with current pricing, historical trends, and dynamic chart visualizations
• Enable basic search functionality for specific Omega watch models
• Deliver daily price updates with automated notifications for stale data
• Integrate free data sources and Wayback Machine for historical pricing context

## 3. User Stories

### US-001: Component Structure Refactoring
**Description**: Reorganize the existing codebase into a feature-based folder structure to improve maintainability and scalability.

**Acceptance Criteria**:
- [ ] Create feature-based folder structure under `/src/features/`
- [ ] Move all watch-related components to `/src/features/watches/` directory
- [ ] Establish shared components directory at `/src/components/shared/`
- [ ] Update all import statements to reflect new structure
- [ ] Typecheck passes without errors
- [ ] All existing functionality remains intact after refactoring

### US-002: Testing Framework Setup
**Description**: Implement Jest and React Testing Library as the unit testing framework for the application.

**Acceptance Criteria**:
- [ ] Install and configure Jest in the Next.js application
- [ ] Install and configure React Testing Library
- [ ] Create `jest.config.js` with appropriate settings for Next.js
- [ ] Set up test scripts in `package.json` for running tests
- [ ] Create example test file to verify framework is working
- [ ] Typecheck passes without errors
- [ ] Test command `npm test` runs successfully

### US-003: Data Source Integration Setup
**Description**: Establish connections to free pricing data sources and Wayback Machine for historical data collection.

**Acceptance Criteria**:
- [ ] Create data service layer in `/src/services/priceData.js`
- [ ] Implement function to fetch data from Chrono24 (where free access available)
- [ ] Implement function to fetch data from eBay API (free tier)
- [ ] Implement Wayback Machine integration for historical data
- [ ] Add error handling for failed API requests
- [ ] Typecheck passes without errors
- [ ] All API functions return consistent data structure

### US-004: Basic Watch Model Data Structure
**Description**: Create the core data models and types for representing Omega watch information and pricing data.

**Acceptance Criteria**:
- [ ] Define TypeScript interfaces for Watch model in `/src/types/watch.ts`
- [ ] Define TypeScript interfaces for PriceData model
- [ ] Define TypeScript interfaces for PriceHistory model
- [ ] Include fields: model name, reference number, current price, price history array
- [ ] Export all interfaces from main types index file
- [ ] Typecheck passes without errors
- [ ] All interfaces include proper JSDoc documentation

### US-005: Watch Search Component
**Description**: Create a search input component that allows users to find specific Omega watch models.

**Acceptance Criteria**:
- [ ] Create `WatchSearch` component in `/src/features/watches/components/`
- [ ] Implement text input with placeholder "Search Omega watches..."
- [ ] Add search icon and clear button functionality
- [ ] Implement debounced search (300ms delay)
- [ ] Emit search events to parent component
- [ ] Component renders without errors in browser
- [ ] Verify in browser using dev-browser skill
- [ ] Typecheck passes without errors

### US-006: Price Display Component
**Description**: Create a component to display current pricing information for a specific Omega watch model.

**Acceptance Criteria**:
- [ ] Create `PriceDisplay` component in `/src/features/watches/components/`
- [ ] Display current price with proper currency formatting
- [ ] Show price source (e.g., "Chrono24", "eBay")
- [ ] Display last updated timestamp
- [ ] Include loading state when data is being fetched
- [ ] Handle error state when price data unavailable
- [ ] Component renders correctly with mock data in browser
- [ ] Verify in browser using dev-browser skill
- [ ] Typecheck passes without errors

### US-007: Historical Price Chart Component
**Description**: Implement a dynamic chart component to visualize price history over time using a free charting library.

**Acceptance Criteria**:
- [ ] Install Chart.js or Recharts (free charting library)
- [ ] Create `PriceChart` component in `/src/features/watches/components/`
- [ ] Render line chart showing price over time
- [ ] Include hover tooltips showing exact price and date
- [ ] Add responsive design for mobile and desktop
- [ ] Handle empty data state with appropriate message
- [ ] Chart renders correctly with sample data in browser
- [ ] Verify in browser using dev-browser skill
- [ ] Typecheck passes without errors

### US-008: Watch List Display Component
**Description**: Create a component that displays a list of Omega watches with basic information and current prices.

**Acceptance Criteria**:
- [ ] Create `WatchList` component in `/src/features/watches/components/`
- [ ] Display watch model name, reference number, and current price
- [ ] Implement grid layout responsive to screen size
- [ ] Add loading skeleton for when data is being fetched
- [ ] Include "No results found" state for empty search results
- [ ] Each watch item is clickable (emit click events)
- [ ] Component renders with sample data in browser
- [ ] Verify in browser using dev-browser skill
- [ ] Typecheck passes without errors

### US-009: Daily Price Update Service
**Description**: Implement a background service that fetches updated pricing data on a daily schedule.

**Acceptance Criteria**:
- [ ] Create `priceUpdateService.js` in `/src/services/`
- [ ] Implement function to fetch prices from all configured sources
- [ ] Add data validation to ensure price data quality
- [ ] Store fetched data in appropriate format
- [ ] Log successful updates and errors
- [ ] Function completes without throwing unhandled errors
- [ ] Typecheck passes without errors
- [ ] Service can be manually triggered for testing

### US-010: Main Watch Tracking Page
**Description**: Create the primary page that combines all watch tracking components into a cohesive user interface.

**Acceptance Criteria**:
- [ ] Create `/src/app/watches/page.tsx` as main watch tracking page
- [ ] Integrate WatchSearch, WatchList, and PriceChart components
- [ ] Implement state management for search functionality
- [ ] Add page title and basic navigation
- [ ] Handle component communication (search results, selected watch)
- [ ] Implement error boundary for graceful error handling
- [ ] Page loads successfully in browser with all components
- [ ] Verify in browser using dev-browser skill
- [ ] Typecheck passes without errors

## 4. Functional Requirements

### FR-1: Price Data Collection
The system shall collect pricing data from multiple sources including Chrono24, eBay, and auction houses through free APIs and web scraping where legally permitted.

### FR-2: Historical Data Integration
The system shall integrate with Wayback Machine to collect historical pricing data for trend analysis.

### FR-3: Daily Data Updates
The system shall automatically update price data daily and notify administrators when data sources become unavailable or stale.

### FR-4: Search Functionality
The system shall provide text-based search functionality to find specific Omega watch models by name or reference number.

### FR-5: Price Visualization
The system shall display current prices and historical trends through dynamic, interactive charts.

### FR-6: Responsive Design
The system shall function correctly on desktop, tablet, and mobile devices.

### FR-7: Error Handling
The system shall gracefully handle API failures, missing data, and network connectivity issues.

## 5. Non-Goals

• Integration with paid data sources or premium APIs
• User authentication or personalized watchlists
• Price alerts or notification system for end users
• Support for other watch brands beyond Omega
• Real-time price streaming or minute-by-minute updates
• Advanced analytics or market prediction features
• E-commerce functionality or purchase integration

## 6. Design Considerations

### User Interface
- Clean, minimal design focusing on data readability
- Responsive grid layouts for watch listings
- Interactive charts with hover states and tooltips
- Clear visual hierarchy emphasizing current prices
- Loading states and skeleton screens for better perceived performance

### Information Architecture
- Search-first approach with prominent search bar
- Results organized by relevance and price ranges
- Historical data accessible through expandable chart views
- Clear data source attribution for transparency

### Accessibility
- WCAG 2.1 AA compliance for color contrast and text sizing
- Keyboard navigation support for all interactive elements
- Screen reader compatibility for data tables and charts
- Alternative text for chart visualizations

## 7. Technical Considerations

### Architecture
- Feature-based folder structure: `/src/features/watches/`
- Separation of concerns: components, services, types, and utilities
- Shared component library for reusable UI elements
- Service layer abstraction for external API interactions

### Data Management
- TypeScript interfaces for type safety across price data models
- Local caching strategy to reduce API calls and improve performance
- Data validation layer to ensure pricing data integrity
- Error boundaries to prevent component crashes from API failures

### Testing Strategy
- Unit tests for all utility functions and data services
- Component testing with React Testing Library
- Integration tests for API data flows
- Minimum 80% code coverage target

### Performance
- Debounced search inputs to reduce unnecessary API calls
- Lazy loading for chart components and historical data
- Optimized bundle size through tree shaking and code splitting
- Image optimization for any watch photos or branding

### External Dependencies
- Chart.js or Recharts for data visualization
- Axios or fetch for HTTP requests
- Date-fns for date manipulation and formatting
- Jest and React Testing Library for testing framework

## 8. Success Metrics

### User Engagement Metrics
- **Daily Active Users (DAU)**: Target 100+ daily users within first month
- **Average Session Duration**: Target 3+ minutes per session
- **Search Success Rate**: >70% of searches return relevant results

### Feature Adoption Metrics
- **Chart Interaction Rate**: >40% of users interact with price charts
- **Search Usage**: >60% of sessions include at least one search query
- **Return Visitor Rate**: >30% of users return within 7 days

### Technical Performance Metrics
- **Page Load Time**: <2 seconds for initial page load
- **API Response Time**: <500ms average for price data requests
- **System Uptime**: >99% availability during business hours

### Data Quality Metrics
- **Data Freshness**: >95% of price data updated within 24 hours
- **Source Coverage**: Price data from at least 2 sources for 80% of watches
- **Error Rate**: <5% of API requests result in errors

## 9. Open Questions

### Data Sources and Integration
- **Q1**: Which specific Omega watch models should be prioritized for initial data collection?
- **Q2**: What fallback strategy should be implemented when primary data sources are unavailable?
- **Q3**: How should the system handle price discrepancies between different sources?

### User Experience
- **Q4**: Should the system display price ranges or specific prices when multiple sources are available?
- **Q5**: What time period should be the default view for historical price charts (30 days, 6 months, 1 year)?
- **Q6**: How should the search results be ranked when multiple matches are found?

### Technical Implementation
- **Q7**: What caching strategy should be implemented for API responses to balance freshness and performance?
- **Q8**: Should the system implement server-side rendering for better SEO and initial load performance?
- **Q9**: What monitoring and alerting should be in place for the daily data update processes?

### Future Considerations
- **Q10**: What data should be collected now to support potential future features like price alerts or trend analysis?
- **Q11**: How should the system be designed to easily add other luxury watch brands in the future?
- **Q12**: What analytics should be implemented to understand user behavior and feature usage?