# Frontend Implementation Roadmap - TraceRTM

**Target**: 100% test coverage, 0 lint/type errors, feature parity across Web/PWA/Desktop/Mobile

---

## PHASE 1: Foundation (Weeks 1-2)

### 1.1 Project Setup
- [ ] Create monorepo structure (pnpm workspaces)
- [ ] Setup React 19 + TypeScript + Vite
- [ ] Configure Vitest + Playwright
- [ ] Setup ESLint + Prettier + TypeScript strict mode
- [ ] Create shared types from OpenAPI spec

**Deliverables**:
- Monorepo with 3 workspaces: `web`, `desktop`, `mobile`
- CI/CD pipeline (GitHub Actions)
- Pre-commit hooks (lint + type check)

### 1.2 State Management
- [ ] Install Legend State + TanStack Query v5
- [ ] Create observable state for projects/items/links
- [ ] Implement sync manager (queue + flush)
- [ ] Setup IndexedDB schema
- [ ] Create conflict resolution logic

**Tests**: 100% coverage for state management

### 1.3 API Integration
- [ ] Generate OpenAPI types
- [ ] Create API client with openapi-fetch
- [ ] Setup WebSocket connection manager
- [ ] Implement retry logic + exponential backoff
- [ ] Create mock API for testing

**Tests**: Unit tests for API client, integration tests with mock server

---

## PHASE 2: Core UI (Weeks 3-4)

### 2.1 Layout & Navigation
- [ ] Create main layout (sidebar + content area)
- [ ] Implement project switcher
- [ ] Build view navigation (16 views)
- [ ] Add keyboard shortcuts
- [ ] Create responsive design

**Components**:
- `Layout.tsx` - Main layout wrapper
- `Sidebar.tsx` - Project/view navigation
- `ViewSwitcher.tsx` - Quick view switching
- `KeyboardShortcuts.tsx` - Shortcut handler

### 2.2 Item Views (Start with 3 core views)
- [ ] Feature View (list + detail)
- [ ] Code View (tree + detail)
- [ ] Test View (matrix + detail)

**Each View**:
- List component (virtualized for 10K+ items)
- Detail panel (edit form)
- Search/filter
- Bulk actions

### 2.3 Real-Time Updates
- [ ] WebSocket connection manager
- [ ] Live update handler
- [ ] Agent activity feed
- [ ] Conflict detection UI

**Tests**: E2E tests for real-time sync

---

## PHASE 3: Offline-First (Weeks 5-6)

### 3.1 Offline Detection & Sync
- [ ] Implement online/offline detection
- [ ] Create sync queue UI
- [ ] Build conflict resolution UI
- [ ] Add sync status indicator
- [ ] Implement background sync

**Tests**:
- Unit: Sync logic
- Integration: Offline mutations + sync
- E2E: Go offline → edit → sync → verify

### 3.2 IndexedDB Integration
- [ ] Setup IndexedDB with WatermelonDB
- [ ] Implement data persistence
- [ ] Create migration strategy
- [ ] Add data export/import

**Tests**: 100% coverage for persistence layer

---

## PHASE 4: Advanced Features (Weeks 7-8)

### 4.1 Linking & Relationships
- [ ] Build link creation UI
- [ ] Implement link visualization
- [ ] Create impact analysis view
- [ ] Add dependency graph

### 4.2 Bulk Operations
- [ ] Implement bulk create/update/delete
- [ ] Add undo/redo
- [ ] Create batch preview
- [ ] Add progress tracking

### 4.3 Search & Analytics
- [ ] Full-text search
- [ ] Advanced filters
- [ ] Analytics dashboard
- [ ] Export functionality

---

## PHASE 5: Platform-Specific (Weeks 9-10)

### 5.1 Electron Desktop
- [ ] Setup Electron + electron-builder
- [ ] Implement IPC security
- [ ] Add file system access
- [ ] Setup auto-updates
- [ ] Create native menus

### 5.2 React Native Mobile
- [ ] Setup Expo + EAS
- [ ] Implement mobile UI (touch-optimized)
- [ ] Add push notifications
- [ ] Setup background sync
- [ ] Create app store builds

### 5.3 PWA
- [ ] Create service worker
- [ ] Implement offline page
- [ ] Add install prompt
- [ ] Setup web manifest
- [ ] Test on mobile browsers

---

## PHASE 6: Testing & Quality (Weeks 11-12)

### 6.1 Unit Tests
- [ ] 100% coverage for all utilities
- [ ] 100% coverage for state management
- [ ] 100% coverage for API client
- [ ] Component unit tests (Vitest)

### 6.2 Integration Tests
- [ ] API integration tests (Playwright)
- [ ] Offline sync tests
- [ ] Real-time update tests
- [ ] Conflict resolution tests

### 6.3 E2E Tests
- [ ] Critical user journeys
- [ ] Cross-platform scenarios
- [ ] Performance tests
- [ ] Load tests (1000 concurrent users)

### 6.4 Quality Gates
- [ ] 100% test coverage
- [ ] 0 lint errors
- [ ] 0 type errors
- [ ] Performance benchmarks met
- [ ] Accessibility (WCAG 2.1 AA)

---

## PHASE 7: Deployment (Week 13)

### 7.1 Staging Deployment
- [ ] Deploy backend to staging
- [ ] Deploy web to Vercel
- [ ] Deploy desktop to GitHub Releases
- [ ] Deploy mobile to TestFlight/Google Play

### 7.2 Production Deployment
- [ ] Setup monitoring (OpenTelemetry)
- [ ] Configure logging
- [ ] Setup error tracking (Sentry)
- [ ] Create runbooks

---

## TECH STACK SUMMARY

### Frontend
- **Framework**: React 19 + TypeScript
- **Build**: Vite
- **State**: Legend State + TanStack Query v5
- **Storage**: IndexedDB + WatermelonDB
- **Styling**: TailwindCSS
- **UI Components**: Headless UI + Radix UI
- **Testing**: Vitest + Playwright
- **Linting**: ESLint + Prettier

### Desktop
- **Framework**: Electron
- **Build**: electron-builder
- **Updates**: electron-updater

### Mobile
- **Framework**: React Native + Expo
- **Storage**: WatermelonDB
- **Notifications**: Expo Notifications

### Shared
- **API Types**: Generated from OpenAPI
- **API Client**: openapi-fetch
- **Utilities**: lodash-es, date-fns

---

## SUCCESS CRITERIA

✓ **100% Test Coverage**
- All code paths tested
- All edge cases covered
- Performance tests included

✓ **0 Quality Issues**
- No lint errors
- No type errors
- No compile errors

✓ **Feature Parity**
- All 16 views on all platforms
- Offline-first on all platforms
- Real-time sync on all platforms

✓ **Performance**
- List 10K items: < 500ms
- Create item: < 100ms
- Sync 100 mutations: < 2s
- WebSocket latency: < 100ms

✓ **User Experience**
- Keyboard shortcuts
- Offline indication
- Sync status
- Conflict resolution UI

---

## RISK MITIGATION

| Risk | Mitigation |
|------|-----------|
| Offline sync conflicts | Implement CRDT + conflict UI |
| Real-time performance | Use WebSocket + connection pooling |
| Cross-platform code duplication | Shared business logic in TypeScript |
| Test coverage gaps | Enforce 100% coverage in CI/CD |
| Type safety | Use strict TypeScript + basedpyright |


