Analyze and optimize your Odoo PWA for performance, bundle size, and user experience.

## What this command does:
- Analyzes bundle size
- Identifies performance bottlenecks
- Suggests optimizations
- Checks caching efficiency
- Reviews PWA configuration
- Provides actionable recommendations

---

## Quick Performance Check 🚀

### Run These Commands:
```bash
# Build for production
npm run build

# Analyze bundle size
npm run build -- --analyze

# Preview production build
npm run preview

# Run Lighthouse audit
# (Chrome DevTools → Lighthouse tab)
```

---

## Bundle Size Analysis 📦

### Check Current Size
```bash
# Build and see output
npm run build

# Typical output:
# dist/index.html                   1.2 kB
# dist/assets/index-abc123.js      45.3 kB
# dist/assets/vendor-def456.js    120.5 kB
```

### Analyze Bundle Composition
```bash
# Install analyzer
npm install -D rollup-plugin-visualizer

# Add to vite.config.js
import { visualizer } from 'rollup-plugin-visualizer';

export default {
  plugins: [
    // ...other plugins
    visualizer({
      open: true,
      gzipSize: true,
      brotliSize: true
    })
  ]
};

# Build and open report
npm run build
# Opens stats.html in browser
```

### Target Bundle Sizes:
- ✅ **Excellent**: < 200 KB (gzipped)
- ⚠️ **Good**: 200-500 KB
- ❌ **Needs Work**: > 500 KB

---

## Optimization Strategies

### 1. Code Splitting 📂

#### Lazy Load Routes
**SvelteKit** (automatic):
```javascript
// Routes are auto-split
// src/routes/+page.svelte → separate chunk
```

**React**:
```javascript
import { lazy, Suspense } from 'react';

const ExpenseList = lazy(() => import('./ExpenseList'));

function App() {
  return (
    <Suspense fallback={<Loading />}>
      <ExpenseList />
    </Suspense>
  );
}
```

**Vue**:
```javascript
const ExpenseList = () => import('./ExpenseList.vue');

const routes = [
  {
    path: '/expenses',
    component: ExpenseList // Lazy loaded
  }
];
```

#### Manual Code Splitting
```javascript
// Split heavy utility into separate chunk
const heavyUtil = await import('./heavyUtility.js');
heavyUtil.doSomething();
```

### 2. Tree Shaking 🌳

#### Remove Unused Code
```javascript
// Bad: Imports everything
import * as utils from './utils';

// Good: Import only what you need
import { formatDate, formatCurrency } from './utils';
```

#### Check for Unused Dependencies
```bash
npm install -g depcheck
depcheck

# Remove unused packages
npm uninstall <unused-package>
```

### 3. Optimize Dependencies 📚

#### Use Lighter Alternatives
```javascript
// Instead of moment.js (heavy)
import moment from 'moment'; // 72 KB

// Use date-fns (tree-shakeable)
import { format } from 'date-fns'; // ~2 KB

// Or native Date
new Date().toLocaleDateString();
```

#### Common Heavy Packages & Alternatives:
- ❌ **moment** (72 KB) → ✅ **date-fns** (tree-shakeable)
- ❌ **lodash** (whole) → ✅ **lodash-es** (individual imports)
- ❌ **axios** → ✅ **fetch** (built-in)
- ❌ **uuid** → ✅ **crypto.randomUUID()** (built-in)

### 4. Optimize Images 🖼️

#### Compress Images
```bash
# Install image optimizer
npm install -D vite-plugin-imagemin

# Add to vite.config.js
import viteImagemin from 'vite-plugin-imagemin';

export default {
  plugins: [
    viteImagemin({
      gifsicle: { optimizationLevel: 7 },
      optipng: { optimizationLevel: 7 },
      mozjpeg: { quality: 80 },
      svgo: { plugins: [{ removeViewBox: false }] }
    })
  ]
};
```

#### Lazy Load Images
```javascript
// Native lazy loading
<img src="large-image.jpg" loading="lazy" />

// Or with IntersectionObserver
```

#### Use Appropriate Formats
- **WebP** for photos (smaller than JPEG)
- **SVG** for icons/logos
- **PNG** only when transparency needed

### 5. Minimize JavaScript ⚡

#### Enable Minification (default in Vite)
```javascript
// vite.config.js
export default {
  build: {
    minify: 'terser', // or 'esbuild' (faster)
    terserOptions: {
      compress: {
        drop_console: true, // Remove console.logs
        drop_debugger: true
      }
    }
  }
};
```

#### Remove Development Code
```javascript
// Use environment variables
if (import.meta.env.DEV) {
  console.log('Debug info'); // Removed in production
}
```

---

## Caching Optimization 💾

### 1. Optimize Cache Strategy

#### Review Cache Settings
```javascript
// In cache store
const CACHE_VALIDITY = 5 * 60 * 1000; // 5 minutes

// Consider your use case:
// - Frequently changing data: 1-2 minutes
// - Moderate updates: 5-10 minutes
// - Rarely changes: 30-60 minutes
```

#### Limit Initial Load
```javascript
// Don't fetch everything at once
const records = await odoo.searchRecords(
  model,
  [],
  fields,
  100 // Limit to 100 records initially
);

// Load more on demand (pagination)
```

### 2. Optimize Sync Frequency
```javascript
// Adjust sync interval based on needs
const SYNC_INTERVAL = 5 * 60 * 1000; // 5 minutes

// Balance:
// - More frequent: Better UX, more bandwidth
// - Less frequent: Less bandwidth, slightly stale data
```

### 3. Selective Caching
```javascript
// Only cache fields you need
const fields = [
  'x_studio_name',
  'x_studio_amount',
  'x_studio_date'
  // Don't fetch unnecessary fields
];
```

---

## PWA Optimization 📱

### 1. Service Worker Configuration

#### Optimize Caching Strategy
```javascript
// In service worker or vite-plugin-pwa config
VitePWA({
  workbox: {
    runtimeCaching: [
      {
        urlPattern: /^https:\/\/fonts\.googleapis\.com\/.*/,
        handler: 'CacheFirst',
        options: {
          cacheName: 'google-fonts',
          expiration: {
            maxEntries: 10,
            maxAgeSeconds: 60 * 60 * 24 * 365 // 1 year
          }
        }
      },
      {
        urlPattern: /^https:\/\/.*\.odoo\.com\/.*/,
        handler: 'NetworkFirst',
        options: {
          cacheName: 'odoo-api',
          networkTimeoutSeconds: 3
        }
      }
    ]
  }
})
```

### 2. Optimize Manifest
```json
{
  "name": "Expense Tracker",
  "short_name": "Expenses",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#0066cc",
  "icons": [
    {
      "src": "/icon-192.png",
      "sizes": "192x192",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "/icon-512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ]
}
```

### 3. Optimize Icons
```bash
# Use optimized PNG or WebP
# Compress images
# Provide multiple sizes
```

---

## Network Optimization 🌐

### 1. Reduce API Calls

#### Batch Requests
```javascript
// Bad: Multiple calls
const expenses = await fetchExpenses();
const tasks = await fetchTasks();
const partners = await fetchPartners();

// Good: Single call (if Odoo supports)
const data = await fetchAll(['expenses', 'tasks', 'partners']);
```

#### Cache Partner Names
```javascript
// Fetch once, reuse
const partners = await odoo.fetchPartners();
localStorage.setItem('partnerCache', JSON.stringify(partners));

// Later, use cached data
const cached = JSON.parse(localStorage.getItem('partnerCache'));
```

### 2. Incremental Loading
```javascript
// Load initial data
const initial = await fetchExpenses({ limit: 20 });

// Load more on scroll
function onScroll() {
  if (nearBottom) {
    loadMore();
  }
}
```

### 3. Optimize Requests
```javascript
// Only fetch fields you display
const fields = ['id', 'x_studio_name', 'x_studio_amount'];

// Use appropriate domain filters
const domain = [
  ['x_studio_date', '>=', lastMonth],
  ['x_studio_status', '!=', 'deleted']
];
```

---

## UI Performance 🎨

### 1. Virtual Scrolling
For long lists:
```javascript
// SvelteKit
import { VirtualList } from 'svelte-virtual-list';

<VirtualList items={expenses} let:item>
  <ExpenseCard expense={item} />
</VirtualList>

// React
import { FixedSizeList } from 'react-window';

// Vue
import { RecycleScroller } from 'vue-virtual-scroller';
```

### 2. Debounce Search
```javascript
import { debounce } from './utils';

const handleSearch = debounce((query) => {
  searchExpenses(query);
}, 300); // Wait 300ms after typing stops
```

### 3. Optimize Rendering
```javascript
// SvelteKit: Use keyed each blocks
{#each expenses as expense (expense.id)}
  <ExpenseCard {expense} />
{/each}

// React: Use keys and memo
const ExpenseCard = memo(({ expense }) => {
  // ...
});

expenses.map(expense => (
  <ExpenseCard key={expense.id} expense={expense} />
));

// Vue: Use v-memo
<ExpenseCard
  v-for="expense in expenses"
  :key="expense.id"
  :expense="expense"
  v-memo="[expense.id]"
/>
```

---

## Build Optimization 🔨

### Vite Config Optimizations
```javascript
// vite.config.js
export default {
  build: {
    // Target modern browsers
    target: 'es2020',

    // Optimize chunks
    rollupOptions: {
      output: {
        manualChunks: {
          vendor: ['svelte', '@sveltejs/kit'],
          odoo: ['./src/lib/odoo.js', './src/lib/stores']
        }
      }
    },

    // Compression
    minify: 'esbuild', // Faster than terser

    // Source maps (only for debugging)
    sourcemap: false
  },

  // Optimize dependencies
  optimizeDeps: {
    include: ['date-fns', 'lodash-es']
  }
};
```

---

## Lighthouse Audit 💡

### Run Lighthouse
1. Open Chrome DevTools
2. Go to Lighthouse tab
3. Select categories:
   - ✅ Performance
   - ✅ Progressive Web App
   - ✅ Best Practices
   - ✅ Accessibility
   - ✅ SEO
4. Click "Analyze page load"

### Target Scores:
- **Performance**: > 90
- **PWA**: 100
- **Best Practices**: > 95
- **Accessibility**: > 90
- **SEO**: > 90

### Common Issues & Fixes:

#### Low Performance Score
- Reduce bundle size
- Optimize images
- Enable caching
- Lazy load resources

#### PWA Issues
- Fix manifest.json
- Register service worker
- Add offline support
- Provide app icons

#### Accessibility Issues
- Add alt text to images
- Use semantic HTML
- Ensure color contrast
- Add ARIA labels

---

## Performance Monitoring 📊

### Add Performance Tracking
```javascript
// Measure initial load
window.addEventListener('load', () => {
  const perfData = performance.getEntriesByType('navigation')[0];

  console.log('Load time:', perfData.loadEventEnd - perfData.fetchStart);
  console.log('DOM ready:', perfData.domContentLoadedEventEnd - perfData.fetchStart);
});

// Measure sync time
console.time('sync');
await expenseCache.refresh();
console.timeEnd('sync');
```

### Use Web Vitals
```bash
npm install web-vitals

# In app
import { getCLS, getFID, getFCP, getLCP, getTTFB } from 'web-vitals';

getCLS(console.log);
getFID(console.log);
getFCP(console.log);
getLCP(console.log);
getTTFB(console.log);
```

---

## Optimization Checklist ✅

### Bundle Size:
```
□ Analyzed bundle composition
□ Removed unused dependencies
□ Lazy loaded routes/components
□ Optimized images
□ Tree-shaking enabled
□ Minification enabled
□ Total size < 500 KB (gzipped)
```

### Caching:
```
□ Optimal cache validity period
□ Incremental sync working
□ Selective field fetching
□ Partner name caching
□ Appropriate sync frequency
□ IndexedDB optimized
```

### PWA:
```
□ Service worker registered
□ Offline mode works
□ App installable
□ Icons optimized
□ Manifest configured
□ Fast load time
```

### Performance:
```
□ Lighthouse score > 90
□ Initial load < 3s
□ Sync time < 2s
□ No console errors
□ Smooth scrolling
□ Fast navigation
```

---

## Example prompts to use this command:
- `/optimize` - Run optimization checks
- User: "Make my app faster"
- User: "Reduce bundle size"
- User: "Optimize performance"

## Related Commands:
- `/test-connection` - Test after optimization
- `/update-deps` - Update to faster versions
- `/troubleshoot` - Fix performance issues
- `/help` - More information

---

## Quick Wins 🎯

### Immediate Optimizations:
1. **Enable compression** (already in Vite)
2. **Remove console.logs** in production
3. **Lazy load routes** (easy with frameworks)
4. **Optimize images** (use WebP)
5. **Limit initial data fetch** (pagination)

### Medium Effort:
1. **Analyze and split bundles**
2. **Replace heavy dependencies**
3. **Implement virtual scrolling**
4. **Optimize service worker**
5. **Add performance monitoring**

### Long Term:
1. **Regular Lighthouse audits**
2. **Monitor real user metrics**
3. **Continuous optimization**
4. **Keep dependencies updated**
5. **Review and refactor regularly**