`tasks/prd-omega-watches-historical-price-tracking-and-visualization-system.md`

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# Product Requirements Document: Omega Watches Historical Price Tracking and Visualization System

## 1. Introduction/Overview

The Omega Watches Historical Price Tracking and Visualization System is a web application that allows users to track and visualize historical pricing data for Omega timepieces. This system will provide comprehensive price tracking capabilities with modern user experience features including dark mode support and a well-organized component architecture.

The application will be built using Next.js 16 and React 19, providing a fast and responsive user interface for watch enthusiasts, collectors, and dealers to monitor price trends and make informed decisions.

## 2. Goals

• Provide accurate historical price tracking for Omega watches
• Create an intuitive visualization system for price data
• Implement a modern, accessible user interface with dark mode support
• Establish a maintainable and testable codebase with proper component organization
• Ensure high performance and responsive design across all devices
• Display authentic watch images using only real Omega watch photos

## 3. User Stories

### US-001: Basic Price Data Display
**Description**: As a user, I want to view current and historical price data for Omega watches so that I can understand price trends.
**Acceptance Criteria**:
- Price data displays in a clear, readable format
- Current price is prominently shown
- Historical price points are visible
- All prices include currency denomination
- Typecheck passes
- Verify in browser using dev-browser skill

### US-002: Watch Model Selection
**Description**: As a user, I want to select different Omega watch models so that I can view price data for specific timepieces.
**Acceptance Criteria**:
- Dropdown or search interface for model selection is present
- Selected model updates the displayed data
- Model names are accurate and complete
- Only real Omega watch images are displayed (no placeholders)
- Typecheck passes
- Verify in browser using dev-browser skill

### US-003: Price Visualization Chart
**Description**: As a user, I want to see price data in a visual chart format so that I can easily identify trends and patterns.
**Acceptance Criteria**:
- Chart renders with price on Y-axis and time on X-axis
- Chart updates when different models are selected
- Chart is responsive and readable on mobile devices
- Hover/touch interactions show specific data points
- Typecheck passes
- Verify in browser using dev-browser skill

### US-004: Dark Mode Toggle
**Description**: As a user, I want to toggle between light and dark modes so that I can use the application comfortably in different lighting conditions.
**Acceptance Criteria**:
- Toggle button is visible and accessible
- Clicking toggle switches between light and dark themes
- Theme preference persists across browser sessions
- All components render correctly in both themes
- Color contrast meets accessibility standards
- Typecheck passes
- Verify in browser using dev-browser skill

### US-005: Responsive Layout Structure
**Description**: As a user, I want the application to work well on my mobile device so that I can access price data anywhere.
**Acceptance Criteria**:
- Layout adapts to screen sizes below 768px width
- All interactive elements are touch-friendly (minimum 44px)
- Text remains readable at mobile sizes
- Charts and visualizations scale appropriately
- Typecheck passes
- Verify in browser using dev-browser skill

### US-006: Component Organization Refactor
**Description**: As a developer, I want well-organized components so that the codebase is maintainable and scalable.
**Acceptance Criteria**:
- Components are separated into logical files
- Each component has a single responsibility
- Shared components are in a common directory
- Component props are properly typed with TypeScript
- No component file exceeds 200 lines of code
- Typecheck passes

### US-007: Unit Test Framework Setup
**Description**: As a developer, I want a unit testing framework so that I can verify component functionality.
**Acceptance Criteria**:
- Testing framework is installed and configured
- At least one test file exists for each major component
- Tests can be run with a single npm command
- Test coverage report is generated
- All existing tests pass
- Typecheck passes

### US-008: Watch Image Display
**Description**: As a user, I want to see authentic images of Omega watches so that I can visually identify the models I'm researching.
**Acceptance Criteria**:
- Only real Omega watch photographs are used
- Images load properly and have alt text
- Images are optimized for web display
- Images display correctly in both light and dark modes
- No placeholder images are present
- Typecheck passes
- Verify in browser using dev-browser skill

## 4. Functional Requirements

### FR-1: Price Data Management
The system shall store and retrieve historical price data for multiple Omega watch models with timestamps and price values.

### FR-2: Data Visualization
The system shall display price data using interactive charts that support zooming, panning, and data point inspection.

### FR-3: Theme Management
The system shall provide light and dark mode themes with persistent user preference storage.

### FR-4: Model Filtering
The system shall allow users to filter and search for specific Omega watch models.

### FR-5: Responsive Design
The system shall provide optimal user experience across desktop, tablet, and mobile devices.

### FR-6: Performance Optimization
The system shall load initial content within 3 seconds on standard broadband connections.

### FR-7: Accessibility Compliance
The system shall meet WCAG 2.1 AA accessibility standards.

## 5. Non-Goals

• Integration with external pricing APIs or real-time data feeds
• User authentication or personalized accounts
• Purchase or transaction functionality
• Support for watch brands other than Omega
• Advanced analytics or predictive pricing features
• Multi-language support
• Print functionality
• Export capabilities for price data

## 6. Design Considerations

• **Visual Hierarchy**: Price information should be the primary focus with clear typography and spacing
• **Color System**: Implement a consistent color palette that works well in both light and dark modes
• **Accessibility**: Ensure sufficient color contrast and keyboard navigation support
• **Mobile-First**: Design components with mobile users as the primary consideration
• **Loading States**: Provide clear feedback during data loading operations
• **Error Handling**: Display user-friendly error messages for failed data requests
• **Image Quality**: Use high-resolution, authentic Omega watch images consistently

## 7. Technical Considerations

• **Framework**: Next.js 16 with React 19 for optimal performance and developer experience
• **State Management**: Use React's built-in state management or lightweight solutions
• **Styling**: CSS Modules or styled-components for component-scoped styling
• **Testing**: Jest and React Testing Library for unit and integration tests
• **TypeScript**: Strict type checking enabled for better code quality
• **Performance**: Image optimization using Next.js Image component
• **Build Process**: Automated testing and type checking in CI/CD pipeline
• **Code Organization**: Feature-based folder structure with shared components

## 8. Success Metrics

• **Performance**: Page load time under 3 seconds
• **Accessibility**: WCAG 2.1 AA compliance score of 100%
• **Code Quality**: TypeScript strict mode with zero type errors
• **Test Coverage**: Minimum 80% code coverage for critical components
• **Responsive Design**: Functional on devices from 320px to 1920px width
• **User Experience**: Successful theme switching without layout shifts
• **Maintainability**: Component complexity scores below defined thresholds

## 9. Open Questions

• What specific Omega watch models should be included in the initial release?
• What time ranges should be supported for historical data (1 year, 5 years, etc.)?
• Should the application support multiple currencies or focus on one primary currency?
• What chart types would be most valuable for users (line charts, candlestick, bar charts)?
• Are there specific accessibility requirements beyond WCAG 2.1 AA standards?
• What browser support matrix should be targeted (modern browsers only vs. legacy support)?
• Should the application work offline or require internet connectivity?
• What is the expected data update frequency for price information?