## Task Link
MKT-102 - Product Recommendation Engine

## Summary
Implemented a product recommendation feature on the refund request form that displays relevant alternative products to customers who are requesting refunds. This helps reduce churn by providing purchase alternatives and improves customer experience.

## Claude Usage
- **Used**: Yes
- **Purpose**: Full implementation of product recommendation engine including admin settings and frontend display
- **Output generated**:
  - Admin settings panel with 3 new configuration options
  - Frontend recommendation display with responsive grid layout
  - Product query logic based on category matching
  - Complete CSS styling for recommendation section
- **What was manually verified/modified**:
  - Verified integration with existing WooCommerce functions
  - Confirmed proper sanitization and escaping
  - Tested responsive design breakpoints
  - Validated query performance

## Changes Made

### Admin Settings (woo-refund-and-exchange-lite-admin.php)
- Added "Product Recommendations" section in Refund tab settings
- **Enable Product Recommendations**: Toggle to enable/disable feature
- **Number of Products to Recommend**: Configurable count (1-10 products)
- **Recommendation Section Title**: Customizable heading text

### Frontend Display (wps-rma-refund-request-form.php)
- Product recommendation section displays after customer details
- Smart recommendation algorithm based on product categories
- Responsive grid layout (auto-adjusts for mobile/tablet/desktop)
- Product cards show:
  - Product image
  - Product name
  - Product price
  - Add to Cart button (when available)
- Professional styling with hover effects
- Inline CSS for immediate styling

### Technical Features
- Uses WP_Query for efficient product retrieval
- Category-based product matching for relevance
- Excludes products already in refund request
- Random ordering for variety
- Fully responsive design
- WooCommerce compatible

## Testing
- **Tested locally**: Yes
- **Edge cases covered**:
  - Orders with single product
  - Orders with multiple products from different categories
  - Orders with products from single category
  - Products out of stock (button hidden appropriately)
  - Feature disabled (no recommendations shown)
  - Different recommendation counts (1, 4, 10)
  - Mobile responsive layout
  - Add to cart functionality

## Screenshots / Demo (if applicable)
Recommendation section appears on refund request form with:
- Grid layout of product cards
- Hover effects on product cards
- Add to cart buttons for available products
- Responsive design at various screen sizes

## Checklist
- [x] Code reviewed by self
- [x] No unnecessary code
- [x] Proper naming conventions
- [x] Follows existing plugin architecture
- [x] Settings integrate with existing admin panel
- [x] Display integrates seamlessly with refund form
- [x] Responsive design implemented
- [x] WooCommerce functions used correctly
- [x] Proper sanitization and escaping
- [x] Performance optimized (limited queries)
- [x] Documentation created

## Files Modified
1. `/admin/class-woo-refund-and-exchange-lite-admin.php` (lines 877-920)
2. `/public/partials/wps-rma-refund-request-form.php` (lines 463-596)

## Database Options
- `wps_rma_enable_product_recommendations` (yes/no, default: no)
- `wps_rma_recommendation_count` (1-10, default: 4)
- `wps_rma_recommendation_title` (text, default: "You May Also Like")
