# mockupAWS Frontend v1.0.0

## Overview

Production-ready frontend implementation with performance optimizations, advanced UX features, analytics dashboard, and full accessibility compliance.

## Features Implemented

### 1. Performance Optimizations

#### Code Splitting & Lazy Loading
- All page components are lazy-loaded using React.lazy() and Suspense
- Vendor libraries split into separate chunks:
  - `react-vendor`: React ecosystem (~128KB)
  - `ui-vendor`: UI components (~8.5KB)
  - `data-vendor`: Data fetching (~14KB)
  - `charts`: Recharts visualization (~116KB, lazy loaded)

#### Rendering Optimizations
- React.memo applied to heavy components (charts, scenario lists)
- useMemo/useCallback for expensive computations
- Virtual scrolling for large scenario lists (react-window)

#### Caching Strategy
- Service Worker with stale-while-revalidate pattern
- Static assets cached with automatic updates
- Graceful offline support

### 2. Advanced UX Features

#### Onboarding Tutorial
- React Joyride integration
- Context-aware tours for different pages
- Persistent progress tracking
- Skip/Restart options

#### Keyboard Shortcuts
- Global shortcuts (Ctrl/Cmd+K for command palette)
- Page navigation shortcuts (N, C, R, A, D, S)
- Context-aware (disabled when typing)
- Help modal with all shortcuts

#### Bulk Operations
- Multi-select scenarios
- Bulk delete with confirmation
- Bulk export (JSON/CSV)
- Compare selected scenarios

#### Command Palette
- Quick navigation and actions
- Searchable commands
- Keyboard shortcut hints

### 3. Analytics Dashboard

#### Usage Tracking
- Privacy-compliant event collection
- Page views, feature usage, performance metrics
- Session-based user tracking
- LocalStorage-based storage (1000 events limit)

#### Dashboard Features
- Monthly Active Users (MAU)
- Daily Active Users chart
- Feature adoption rates
- Popular pages
- Performance metrics
- Auto-refresh (30s)

#### Cost Predictions
- 3-month forecasting with confidence intervals
- Anomaly detection using Z-score
- Trend analysis

### 4. Accessibility & i18n

#### Accessibility (WCAG 2.1 AA)
- Keyboard navigation support
- Screen reader compatibility
- Focus management
- Skip links
- ARIA labels and roles
- Reduced motion support
- High contrast mode support

#### Internationalization
- i18next integration
- English and Italian translations
- Language switcher
- Locale-aware formatting
- Browser language detection

## Project Structure

```
frontend/src/
├── components/
│   ├── analytics/
│   │   └── analytics-service.ts    # Analytics tracking service
│   ├── a11y/
│   │   └── AccessibilityComponents.tsx  # Accessibility utilities
│   ├── bulk-operations/
│   │   └── BulkOperationsBar.tsx   # Bulk action toolbar
│   ├── charts/
│   │   └── CostBreakdown.tsx       # Memoized chart components
│   ├── command-palette/
│   │   └── CommandPalette.tsx      # Command palette UI
│   ├── keyboard/
│   │   └── KeyboardShortcutsProvider.tsx  # Keyboard shortcuts
│   ├── layout/
│   │   ├── Header.tsx              # Updated with accessibility
│   │   ├── Sidebar.tsx             # Updated with i18n
│   │   └── Layout.tsx              # With a11y and analytics
│   ├── onboarding/
│   │   └── OnboardingProvider.tsx  # Joyride integration
│   ├── scenarios/
│   │   └── VirtualScenarioList.tsx # Virtual scrolling
│   └── ui/
│       ├── command.tsx             # Radix command UI
│       ├── dropdown-menu.tsx       # Updated with disabled prop
│       └── page-loader.tsx         # Accessible loader
├── i18n/
│   ├── index.ts                    # i18n configuration
│   └── locales/
│       ├── en.json                 # English translations
│       └── it.json                 # Italian translations
├── lib/
│   ├── api.ts                      # Axios instance
│   ├── service-worker.ts           # SW registration
│   └── utils.ts                    # Utility functions
├── pages/
│   ├── AnalyticsDashboard.tsx      # Analytics page
│   └── Dashboard.tsx               # Updated with i18n
└── providers/
    └── I18nProvider.tsx            # i18n React provider

public/
├── sw.js                           # Service worker
└── manifest.json                   # PWA manifest
```

## Installation

```bash
cd frontend
npm install --legacy-peer-deps
```

## Development

```bash
npm run dev
```

## Production Build

```bash
npm run build
```

## Bundle Analysis

```bash
npm run build:analyze
```

## Lighthouse Audit

```bash
# Start preview server
npm run preview

# In another terminal
npm run lighthouse
```

## Bundle Size Summary

| Chunk | Size (gzip) | Description |
|-------|-------------|-------------|
| react-vendor | 128.33 KB | React, React-DOM, Router |
| charts | 116.65 KB | Recharts (lazy loaded) |
| vendor | 21.93 KB | Other dependencies |
| data-vendor | 14.25 KB | React Query, Axios |
| index | 10.17 KB | Main app entry |
| ui-vendor | 8.55 KB | UI components |
| CSS | 8.59 KB | Tailwind styles |

**Total JS**: ~308 KB (gzipped) - Well under 500KB target

## Environment Variables

```env
VITE_API_URL=http://localhost:8000/api/v1
```

## Browser Support

- Chrome/Edge (last 2 versions)
- Firefox (last 2 versions)
- Safari (last 2 versions)
- Modern mobile browsers

## Keyboard Shortcuts Reference

| Shortcut | Action |
|----------|--------|
| Ctrl/Cmd + K | Open command palette |
| N | New scenario |
| C | Compare scenarios |
| R | Reports/Dashboard |
| A | Analytics |
| D | Dashboard |
| S | Scenarios |
| ? | Show keyboard shortcuts |
| Esc | Close modal/dialog |

## Accessibility Checklist

- [x] Keyboard navigation works throughout
- [x] Screen reader tested (NVDA, VoiceOver)
- [x] Color contrast meets WCAG AA
- [x] Focus indicators visible
- [x] Reduced motion support
- [x] ARIA labels on interactive elements
- [x] Skip to content link
- [x] Semantic HTML structure

## i18n Checklist

- [x] i18next configured
- [x] Language detection
- [x] English translations complete
- [x] Italian translations complete
- [x] Language switcher UI
- [x] Date/number formatting

## Performance Checklist

- [x] Code splitting implemented
- [x] Lazy loading for routes
- [x] Vendor chunk separation
- [x] React.memo for heavy components
- [x] Virtual scrolling for lists
- [x] Service Worker caching
- [x] Gzip compression
- [x] Terser minification
