Unit of Work - Nokia Snake Game

Unit Definition

Unit: Nokia Snake Game (Monolithic)

Type: Single monolithic web application
Scope: Complete Nokia Snake game implementation
Deployment: Single web application deployment
Team: Single developer
Testing: End-to-end testing only

Unit Responsibilities

Core Responsibilities

1. Game Engine Implementation: Core game logic, collision detection, game rules
2. Rendering System: WebGL 2D rendering, UI rendering, visual effects
3. Input Handling: Keyboard input processing, input validation, control mapping
4. State Management: Centralized Redux-like state management, persistence
5. User Interface: Menu system, HUD, game screens, notifications
6. Score System: Score tracking, high scores, game progress
7. Service Layer: Game orchestration, event bus, plugin management
8. Plugin System: Extensible plugin architecture

Included Components

• Game Engine Component
• Rendering Component
• Input Handler Component
• State Management Component
• UI Component
• Score/Game State Component
• Game Orchestration Service
• Score Service
• Event Bus Service
• Plugin Manager Service
• Power-up Manager Plugin
• Audio Manager Plugin
• Analytics Plugin

Code Organization Strategy

Directory Structure

nokia-snake-game/
├── src/
│   ├── game-engine/          # Core game logic
│   │   ├── collision/
│   │   ├── game-rules/
│   │   ├── game-loop/
│   │   └── power-ups/
│   ├── rendering/            # WebGL rendering
│   │   ├── webgl/
│   │   ├── ui/
│   │   ├── effects/
│   │   └── themes/
│   ├── input/               # Input handling
│   │   ├── keyboard/
│   │   ├── validation/
│   │   └── mapping/
│   ├── state/              # State management
│   │   ├── store/
│   │   ├── actions/
│   │   ├── reducers/
│   │   └── persistence/
│   ├── ui/                 # User interface
│   │   ├── components/
│   │   ├── screens/
│   │   ├── hud/
│   │   └── menus/
│   ├── services/           # Service layer
│   │   ├── orchestration/
│   │   ├── score/
│   │   ├── events/
│   │   └── plugins/
│   ├── plugins/            # Plugin system
│   │   ├── power-ups/
│   │   ├── audio/
│   │   ├── analytics/
│   │   └── base/
│   └── shared/             # Shared utilities
│       ├── utils/
│       ├── constants/
│       ├── types/
│       └── config/
├── tests/                  # End-to-end tests
│   └── e2e/
├── public/                 # Static assets
│   ├── index.html
│   ├── assets/
│   └── favicon.ico
├── package.json
├── vite.config.js         # Vite configuration
├── README.md
└── .gitignore

Build and Tooling

• Bundler: Vite (modern, fast development server and build tool)
• Package Manager: npm
• Scripts: Defined in package.json
• Development: Hot module replacement, fast builds
• Production: Optimized builds, code splitting (if needed)

Development Workflow

Development Sequence

1. Setup and Configuration (Day 1-2)

   • Project initialization
   • Vite configuration
   • Basic project structure

2. Core Game Engine (Day 3-7)

   • Game loop implementation
   • Collision detection
   • Basic game rules
   • State management foundation

3. Rendering System (Day 8-12)

   • WebGL 2D context setup
   • Basic rendering (snake, food, grid)
   • UI rendering foundation

4. Input and State (Day 13-15)

   • Keyboard input handling
   • Centralized state management
   • State persistence

5. User Interface (Day 16-18)

   • Menu system
   • Game HUD
   • Game screens (start, pause, game over)

6. Services and Plugins (Day 19-21)

   • Game orchestration service
   • Score service
   • Plugin system
   • Basic plugins (power-ups, audio)

7. Integration and Polish (Day 22-25)

   • Component integration
   • Bug fixes and optimization
   • Visual polish
   • End-to-end testing

8. Deployment (Day 26-28)

   • Production build
   • Testing and validation
   • Deployment to web host

Parallel Development Opportunities

• Limited: Single developer, sequential development recommended
• Potential: UI development could overlap with core engine once interfaces are defined

Testing Strategy

End-to-End Testing Only

• Scope: Complete game flow testing
• Tools: Playwright, Cypress, or similar
• Test Coverage:
  1. Game startup and initialization
  2. Basic gameplay (movement, food collection)
  3. Game rules (collision detection, game over)
  4. UI interactions (menus, buttons, screens)
  5. State persistence (save/load games)
  6. Error handling and edge cases

Test Scenarios

1. Happy Path: Complete game from start to game over
2. Edge Cases: Boundary conditions, rapid input, unusual scenarios
3. Persistence: Save/load game state functionality
4. Performance: Game runs at target frame rate (60 FPS)
5. Cross-browser: Works on major browsers

Deployment Strategy

Single Web Application Deployment

• Hosting: Static web hosting (Netlify, Vercel, GitHub Pages, etc.)
• Build: Single production build with Vite
• Assets: All assets bundled or served from CDN
• Configuration: Environment-specific configuration

Deployment Steps

1. Build: npm run build creates dist/ directory
2. Test: Verify build works locally
3. Deploy: Upload dist/ contents to hosting service
4. Verify: Test deployed application
5. Monitor: Basic error monitoring and analytics

Security Considerations

SECURITY Baseline Compliance

• SECURITY-04 (HTTP Security Headers): Configured in Vite or hosting service
• SECURITY-05 (Input Validation): Implemented in Input Handler component
• SECURITY-12 (Authentication): N/A (no authentication needed)
• SECURITY-15 (Exception Handling): Global error handling, safe defaults

Additional Security

• Input Sanitization: All user input sanitized
• XSS Prevention: Content security policy, input escaping
• Data Validation: Game state validation before persistence
• Secure Coding: Follow secure coding best practices

Dependencies

External Dependencies

• Vite: Build tool and development server
• WebGL Libraries: Potential lightweight WebGL helpers
• Testing Framework: End-to-end testing library
• Utility Libraries: Date formatting, math utilities, etc.

Internal Dependencies

• Component Dependencies: As defined in component-dependency.md
• Build Dependencies: Development tools, linters, formatters
• Dev Dependencies: TypeScript (optional), testing tools, build tools

Success Criteria

Functional Success

• Game starts and runs in web browser
• All core Snake mechanics implemented
• Modern minimalist UI functional
• Full game state save/load works
• Power-ups and special features work
• High score tracking functional

Technical Success

• 60 FPS target achieved
• WebGL rendering smooth and efficient
• State management predictable and debuggable
• Code organized by component type
• Vite build process works correctly
• End-to-end tests pass

Quality Success

• No critical bugs in gameplay
• User experience smooth and intuitive
• Visual design consistent and appealing
• Performance acceptable on target hardware
• Security requirements met

Risk Management

Identified Risks

1. WebGL Complexity: WebGL has steep learning curve
2. Single Developer: No backup if developer unavailable
3. Testing Coverage: End-to-end only may miss edge cases
4. Performance: WebGL performance on low-end devices

Mitigation Strategies

1. WebGL: Use 2D context, keep shaders simple, provide fallback if needed
2. Documentation: Comprehensive documentation for knowledge transfer
3. Testing: Thorough end-to-end test scenarios, manual testing
4. Performance: Optimize rendering, test on target devices, provide settings

Next Steps

Immediate Next Steps

1. Project Setup: Initialize Vite project, create directory structure
2. Core Implementation: Start with game engine component
3. Component Development: Follow development sequence
4. Integration: Integrate components as they're completed
5. Testing: Develop end-to-end tests alongside implementation
6. Deployment: Prepare for production deployment

Future Considerations

• Additional Testing: Add unit/integration tests if needed
• Plugin Expansion: Add more plugins over time
• Mobile Adaptation: Responsive design, touch controls
• Feature Updates: New game modes, visual themes, social features