# PWA Setup Guide

## ✅ Implemented Features

### 1. Service Worker
- **Caching Strategy**: Aggressive prefetch for app shell
- **API Caching**: Freshness strategy with 1-hour cache (max 100 requests)
- **Image Caching**: Performance strategy with 7-day cache (max 50 images)
- **Configuration**: `ngsw-config.json`

### 2. Web App Manifests
- **Dexar**: `public/manifest.webmanifest` (purple theme #a855f7)
- **Novo**: `public/manifest.novo.webmanifest` (green theme #10b981)
- **Features**:
  - Installable on mobile/desktop
  - Standalone display mode
  - 8 icon sizes (72px to 512px)
  - Russian language metadata

### 3. Offline Support
- App shell loads instantly from cache
- API responses cached for 1 hour
- Product images cached for 7 days
- Automatic background updates

## 🚀 Testing PWA Functionality

### Local Testing with Production Build

```bash
# Build for production
npm run build -- --configuration=production

# Serve the production build
npx http-server dist/dexarmarket -p 4200 -c-1

# For Novo brand
npx http-server dist/novomarket -p 4201 -c-1
```

### Chrome DevTools Testing

1. Open `http://localhost:4200`
2. Open DevTools (F12)
3. Go to **Application** tab
4. Check:
   - **Service Workers**: Should show registered worker
   - **Cache Storage**: Should show `ngsw:/:db`, `ngsw:/:assets`
   - **Manifest**: Should show app details

### Install Prompt Testing

1. Open app in Chrome/Edge
2. Click the **install icon** in address bar (➕)
3. Confirm installation
4. App opens as standalone window
5. Check Start Menu/Home Screen for app icon

### Offline Testing

1. Open app while online
2. Navigate through pages (loads assets)
3. Open DevTools → Network → Toggle **Offline**
4. Refresh page - should still work!
5. Navigate to cached pages - should load instantly

## 📱 Mobile Testing

### Android Chrome
1. Open app URL
2. Chrome shows "Add to Home Screen" banner
3. Install and open - works like native app
4. Splash screen with your logo/colors

### iOS Safari
1. Open app URL
2. Tap Share → "Add to Home Screen"
3. Icon appears on home screen
4. Opens in full-screen mode

## 🔧 Configuration Details

### Service Worker Caching Strategy

```json
{
  "app": {
    "installMode": "prefetch",  // Download immediately
    "updateMode": "prefetch"     // Auto-update in background
  },
  "assets": {
    "installMode": "lazy",       // Load on-demand
    "updateMode": "prefetch"
  },
  "api-cache": {
    "strategy": "freshness",     // Network first, fallback to cache
    "maxAge": "1h"              // Keep for 1 hour
  },
  "product-images": {
    "strategy": "performance",   // Cache first, update in background
    "maxAge": "7d"              // Keep for 7 days
  }
}
```

### Manifest Differences

| Property | Dexar | Novo |
|----------|-------|------|
| Theme Color | #a855f7 (purple) | #10b981 (green) |
| Name | Dexar Market | Novo Market |
| Icons | Default Angular | Default Angular |
| Background | White (#ffffff) | White (#ffffff) |

## 🎨 Custom Icons (Recommended)

Replace the default Angular icons with brand-specific ones:

```bash
public/icons/
├── icon-72x72.png       # Smallest (splash screen)
├── icon-96x96.png
├── icon-128x128.png
├── icon-144x144.png
├── icon-152x152.png     # iOS home screen
├── icon-192x192.png     # Android home screen
├── icon-384x384.png
└── icon-512x512.png     # Largest (splash, install prompt)
```

**Design Guidelines**:
- Use solid background color (purple for Dexar, green for Novo)
- Center white logo/icon
- Keep design simple (shows at small sizes)
- Export as PNG with transparency or solid background

## 🔄 Update Strategy

### How Updates Work
1. User visits app
2. Service worker checks for updates
3. New version downloads in background
4. User refreshes → gets updated version
5. Old cache automatically cleared

### Force Update (Development)
```bash
# Clear all caches
chrome://serviceworker-internals/  # Unregister worker
chrome://settings/clearBrowserData  # Clear cache

# Or in code (add to app.config.ts)
navigator.serviceWorker.getRegistrations().then(registrations => {
  registrations.forEach(reg => reg.unregister());
});
```

## 📊 Performance Benefits

### Before PWA
- Initial load: ~2-3s (network dependent)
- Subsequent loads: ~1-2s
- Offline: ❌ Not available

### After PWA
- Initial load: ~2-3s (first visit)
- Subsequent loads: **~200-500ms** (cached)
- Offline: ✅ **Fully functional**
- Install: ✅ **Native app experience**

## 🐛 Troubleshooting

### Service Worker Not Registering
- Check console for errors
- Ensure HTTPS (or localhost)
- Clear browser cache and reload

### Old Version Not Updating
- Hard refresh: `Ctrl+Shift+R` (Windows) or `Cmd+Shift+R` (Mac)
- Unregister worker in DevTools
- Wait 24 hours (automatic update)

### Manifest Not Loading
- Check `index.html` has `<link rel="manifest">`
- Verify manifest path is correct
- Check manifest JSON is valid (no syntax errors)

### Icons Not Showing
- Check icon paths in manifest
- Ensure icons exist in `public/icons/`
- Verify icon sizes match manifest

## 📚 Next Steps

1. **Custom Icons**: Create brand-specific icons for both themes
2. **Push Notifications**: Add user engagement (requires backend)
3. **Background Sync**: Queue offline orders, sync when online
4. **Analytics**: Track PWA installs, offline usage
5. **A2HS Prompt**: Show custom "Install App" banner

## 🔗 Resources

- [PWA Checklist](https://web.dev/pwa-checklist/)
- [Angular PWA Guide](https://angular.dev/ecosystem/service-workers)
- [Manifest Generator](https://www.simicart.com/manifest-generator.html/)
- [Icon Generator](https://realfavicongenerator.net/)