# Module System Integration Summary

**Date**: December 26, 2025  
**Status**: ✅ Complete

---

## Overview

All module-related features have been wired to check module status before displaying. When a module is disabled, its features are completely hidden from both admin and customer interfaces.

---

## Integrated Features

### 1. Newsletter Module (`newsletter`)

#### Admin SPA
**File**: `admin-spa/src/routes/Marketing/Newsletter.tsx`
- ✅ Added `useModules()` hook
- ✅ Shows disabled state UI when module is off
- ✅ Provides link to Module Settings
- ✅ Blocks access to newsletter subscribers page

**Navigation**:
- ✅ Newsletter menu item hidden when module disabled (NavigationRegistry.php)

**Result**: When newsletter module is OFF:
- ❌ No "Newsletter" menu item in Marketing
- ❌ Newsletter page shows disabled message
- ✅ User redirected to enable module in settings

---

### 2. Wishlist Module (`wishlist`)

#### Customer SPA

**File**: `customer-spa/src/pages/Account/Wishlist.tsx`
- ✅ Added `useModules()` hook
- ✅ Shows disabled state UI when module is off
- ✅ Provides "Continue Shopping" button
- ✅ Blocks access to wishlist page

**File**: `customer-spa/src/pages/Product/index.tsx`
- ✅ Added `useModules()` hook
- ✅ Wishlist button hidden when module disabled
- ✅ Combined with settings check (`wishlistEnabled`)

**File**: `customer-spa/src/components/ProductCard.tsx`
- ✅ Added `useModules()` hook
- ✅ Created `showWishlist` variable combining module + settings
- ✅ All 4 layout variants updated (Classic, Modern, Boutique, Launch)
- ✅ Heart icon hidden when module disabled

**File**: `customer-spa/src/pages/Account/components/AccountLayout.tsx`
- ✅ Added `useModules()` hook
- ✅ Wishlist menu item filtered out when module disabled
- ✅ Combined with settings check

#### Backend API
**File**: `includes/Frontend/WishlistController.php`
- ✅ All endpoints check module status
- ✅ Returns 403 error when module disabled
- ✅ Endpoints: get, add, remove, clear

**Result**: When wishlist module is OFF:
- ❌ No heart icon on product cards (all layouts)
- ❌ No wishlist button on product pages
- ❌ No "Wishlist" menu item in My Account
- ❌ Wishlist page shows disabled message
- ❌ All wishlist API endpoints return 403

---

### 3. Affiliate Module (`affiliate`)

**Status**: Not yet implemented (module registered, no features built)

---

### 4. Subscription Module (`subscription`)

**Status**: Not yet implemented (module registered, no features built)

---

### 5. Licensing Module (`licensing`)

**Status**: Not yet implemented (module registered, no features built)

---

## Implementation Pattern

### Frontend Check (React)
```tsx
import { useModules } from '@/hooks/useModules';

export default function MyComponent() {
  const { isEnabled } = useModules();
  
  if (!isEnabled('my_module')) {
    return <DisabledStateUI />;
  }
  
  // Normal component render
}
```

### Backend Check (PHP)
```php
use WooNooW\Core\ModuleRegistry;

public function my_endpoint($request) {
    if (!ModuleRegistry::is_enabled('my_module')) {
        return new WP_Error('module_disabled', 'Module is disabled', ['status' => 403]);
    }
    
    // Process request
}
```

### Navigation Check (PHP)
```php
// In NavigationRegistry.php
if (ModuleRegistry::is_enabled('my_module')) {
    $children[] = ['label' => 'My Feature', 'path' => '/my-feature'];
}
```

---

## Files Modified

### Admin SPA (1 file)
1. `admin-spa/src/routes/Marketing/Newsletter.tsx` - Newsletter page module check

### Customer SPA (4 files)
1. `customer-spa/src/pages/Account/Wishlist.tsx` - Wishlist page module check
2. `customer-spa/src/pages/Product/index.tsx` - Product page wishlist button
3. `customer-spa/src/components/ProductCard.tsx` - Product card wishlist hearts
4. `customer-spa/src/pages/Account/components/AccountLayout.tsx` - Account menu filtering

### Backend (2 files)
1. `includes/Frontend/WishlistController.php` - API endpoint protection
2. `includes/Compat/NavigationRegistry.php` - Navigation filtering

---

## Testing Checklist

### Newsletter Module
- [ ] Toggle newsletter OFF in Settings > Modules
- [ ] Verify "Newsletter" menu item disappears from Marketing
- [ ] Try accessing `/marketing/newsletter` directly
- [ ] Expected: Shows disabled message with link to settings
- [ ] Toggle newsletter ON
- [ ] Verify menu item reappears

### Wishlist Module
- [ ] Toggle wishlist OFF in Settings > Modules
- [ ] Visit shop page
- [ ] Expected: No heart icons on product cards
- [ ] Visit product page
- [ ] Expected: No wishlist button
- [ ] Visit My Account
- [ ] Expected: No "Wishlist" menu item
- [ ] Try accessing `/my-account/wishlist` directly
- [ ] Expected: Shows disabled message
- [ ] Try API call: `GET /woonoow/v1/account/wishlist`
- [ ] Expected: 403 error "Wishlist module is disabled"
- [ ] Toggle wishlist ON
- [ ] Verify all features reappear

---

## Performance Impact

### Caching
- Module status cached for 5 minutes via React Query
- Navigation tree rebuilt automatically when modules toggled
- Minimal overhead (~1 DB query per page load)

### Bundle Size
- No impact - features still in bundle, just conditionally rendered
- Future: Could implement code splitting for disabled modules

---

## Future Enhancements

### Phase 2
1. **Code Splitting**: Lazy load module components when enabled
2. **Module Dependencies**: Prevent disabling if other modules depend on it
3. **Bulk Operations**: Enable/disable multiple modules at once
4. **Module Analytics**: Track which modules are most used

### Phase 3
1. **Third-party Modules**: Allow installing external modules
2. **Module Marketplace**: Browse and install community modules
3. **Module Updates**: Version management for modules
4. **Module Settings**: Per-module configuration pages

---

## Developer Notes

### Adding Module Checks to New Features

1. **Import the hook**:
   ```tsx
   import { useModules } from '@/hooks/useModules';
   ```

2. **Check module status**:
   ```tsx
   const { isEnabled } = useModules();
   if (!isEnabled('module_id')) return null;
   ```

3. **Backend protection**:
   ```php
   if (!ModuleRegistry::is_enabled('module_id')) {
       return new WP_Error('module_disabled', 'Module disabled', ['status' => 403]);
   }
   ```

4. **Navigation filtering**:
   ```php
   if (ModuleRegistry::is_enabled('module_id')) {
       $children[] = ['label' => 'Feature', 'path' => '/feature'];
   }
   ```

### Common Pitfalls

1. **Don't forget backend checks** - Frontend checks can be bypassed
2. **Check both module + settings** - Some features have dual toggles
3. **Update navigation version** - Increment when adding/removing menu items
4. **Clear cache on toggle** - ModuleRegistry auto-clears navigation cache

---

## Summary

✅ **Newsletter Module**: Fully integrated (admin page + navigation)  
✅ **Wishlist Module**: Fully integrated (frontend UI + backend API + navigation)  
⏳ **Affiliate Module**: Registered, awaiting implementation  
⏳ **Subscription Module**: Registered, awaiting implementation  
⏳ **Licensing Module**: Registered, awaiting implementation

**Total Integration Points**: 7 files modified, 11 integration points added

**Next Steps**: Implement Newsletter Campaigns feature (as per FEATURE_ROADMAP.md)