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wc-composable-product/IMPLEMENTATION.md
magdev e9df6e4278 Implement comprehensive stock management integration (v1.1.0) 
Added complete inventory tracking system for composable products:
- Stock validation during product selection and add-to-cart
- Automatic stock deduction on order completion/processing
- Automatic stock restoration on order cancellation/refund
- Stock status indicators with visual feedback (In stock, Low stock, Out of stock)
- Prevention of out-of-stock item selection
- Low stock warnings when 5 or fewer items remain
- Order notes documenting all stock changes

New files:
- includes/Stock_Manager.php: Core stock management logic

Modified files:
- includes/Cart_Handler.php: Integrated stock validation
- includes/Product_Selector.php: Added stock info to product data
- includes/Plugin.php: Added Stock_Manager to includes
- templates/product-selector.twig: Stock status display
- assets/css/frontend.css: Stock indicator styling
- languages/*.pot/*.po: 8 new translatable strings

Version bumped to 1.1.0 with updated CHANGELOG.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-31 16:41:53 +01:00

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# WooCommerce Composable Products - Implementation Summary
## Overview
This document provides a technical overview of the WooCommerce Composable Products plugin implementation.
**Version:** 1.0.0
**Created:** 2024-12-31
**AI-Generated:** 100% created with Claude.AI assistance
## Architecture
### Plugin Structure
```txt
wc-composable-product/
├── assets/ # Frontend assets
│ ├── css/
│ │ ├── admin.css # Admin styles
│ │ └── frontend.css # Frontend styles
│ └── js/
│ ├── admin.js # Admin JavaScript
│ └── frontend.js # Frontend JavaScript
├── cache/ # Twig template cache
├── includes/ # PHP classes
│ ├── Admin/
│ │ ├── Product_Data.php # Product data tab
│ │ └── Settings.php # Settings page
│ ├── Cart_Handler.php # Cart integration
│ ├── Plugin.php # Main plugin class
│ ├── Product_Selector.php # Frontend selector
│ └── Product_Type.php # Custom product type
├── languages/ # Translation files
│ └── wc-composable-product.pot
├── templates/ # Twig templates
│ └── product-selector.twig
└── wc-composable-product.php # Main plugin file
```
## Core Components
### 1. Main Plugin Class (`Plugin.php`)
**Responsibilities:**
- Singleton pattern implementation
- Twig template engine initialization
- Hook registration
- Component initialization
- Asset enqueuing
**Key Methods:**
- `instance()`: Get singleton instance
- `init_twig()`: Initialize Twig with WordPress functions
- `render_template()`: Render Twig templates
- `add_product_type()`: Register composable product type
### 2. Product Type (`Product_Type.php`)
**Extends:** `WC_Product`
**Key Features:**
- Custom product type: `composable`
- Selection limit management (per-product or global)
- Pricing mode (fixed or sum)
- Product selection criteria (category/tag/SKU)
- Dynamic product availability
- Price calculation
**Key Methods:**
- `get_selection_limit()`: Get max selectable items
- `get_pricing_mode()`: Get pricing calculation mode
- `get_available_products()`: Query available products
- `calculate_composed_price()`: Calculate final price
### 3. Admin Settings (`Admin/Settings.php`)
**Extends:** `WC_Settings_Page`
**Global Settings:**
- Default selection limit
- Default pricing mode
- Display options (images, prices, total)
**Integration:** Adds tab to WooCommerce Settings
### 4. Product Data Tab (`Admin/Product_Data.php`)
**Responsibilities:**
- Add "Composable Options" tab to product edit page
- Render selection criteria fields
- Save product meta data
- Dynamic field visibility based on criteria type
**Saved Meta:**
- `_composable_selection_limit`: Item limit
- `_composable_pricing_mode`: Pricing calculation
- `_composable_criteria_type`: Selection method
- `_composable_categories`: Selected categories
- `_composable_tags`: Selected tags
- `_composable_skus`: SKU list
### 5. Product Selector (`Product_Selector.php`)
**Responsibilities:**
- Render frontend product selection interface
- Prepare data for Twig template
- Apply display settings
**Template Variables:**
- `products`: Available products array
- `selection_limit`: Max selections
- `pricing_mode`: Pricing calculation
- `show_images/prices/total`: Display flags
### 6. Cart Handler (`Cart_Handler.php`)
**Responsibilities:**
- Validate product selection
- Add selected products to cart data
- Calculate dynamic pricing
- Display selected products in cart
**Hooks:**
- `woocommerce_add_to_cart_validation`: Validate selections
- `woocommerce_add_cart_item_data`: Store selections
- `woocommerce_before_calculate_totals`: Update prices
- `woocommerce_get_item_data`: Display in cart
## Frontend Implementation
### Product Selector Template (`product-selector.twig`)
**Features:**
- Responsive grid layout
- Checkbox-based selection
- Product images and prices
- Real-time total calculation
- AJAX add-to-cart
**Data Attributes:**
- `data-product-id`: Composable product ID
- `data-selection-limit`: Max selections
- `data-pricing-mode`: Pricing mode
- `data-price`: Individual product prices
### JavaScript (`frontend.js`)
**Functionality:**
- Selection limit enforcement
- Visual feedback on selection
- Real-time price updates (sum mode)
- AJAX cart operations
- Error/success messages
**Key Functions:**
- `handleCheckboxChange()`: Selection logic
- `updateTotalPrice()`: Calculate total
- `addToCart()`: AJAX add-to-cart
- `showMessage()`: User feedback
### CSS Styling
**Approach:**
- Grid-based layout (responsive)
- Card-style product items
- Visual selection states
- Mobile-first design
- Breakpoints: 768px, 480px
## Data Flow
### Creating a Composable Product
1. Admin selects "Composable product" type
2. Configure selection limit and pricing mode
3. Choose selection criteria (category/tag/SKU)
4. Save product metadata
5. WooCommerce registers product with custom type
### Frontend Display
1. Customer visits product page
2. `Cart_Handler` renders `Product_Selector`
3. `Product_Type::get_available_products()` queries products
4. Twig template renders grid with products
5. JavaScript handles interactions
### Adding to Cart
1. Customer selects products (JavaScript validation)
2. Click "Add to Cart" button
3. AJAX request with selected product IDs
4. `Cart_Handler::validate_add_to_cart()` validates
5. `Cart_Handler::add_cart_item_data()` stores selections
6. `Cart_Handler::calculate_cart_item_price()` updates price
7. Product added to cart with custom data
### Cart Display
1. WooCommerce loads cart
2. `Cart_Handler::get_cart_item_from_session()` restores data
3. `Cart_Handler::display_cart_item_data()` shows selections
4. Price calculated dynamically on each cart load
## Security Implementation
### Input Sanitization
- **Integers:** `absint()` for IDs and limits
- **Text:** `sanitize_text_field()` for modes and types
- **Textarea:** `sanitize_textarea_field()` for SKUs
- **Arrays:** `array_map()` with sanitization functions
### Output Escaping
- **HTML:** `esc_html()`, `esc_html_e()`
- **Attributes:** `esc_attr()`
- **URLs:** `esc_url()`
- **JavaScript:** Localized scripts with escaped data
### Validation
- Selection limit enforcement
- Product availability verification
- Cart data validation
- Nonce verification (via WooCommerce)
## Internationalization
### Text Domain
`wc-composable-product`
### Translation Functions
- `__()`: Return translated string
- `_e()`: Echo translated string
- `sprintf()` with `__()`: Variable substitution
### POT File
Generated template: `languages/wc-composable-product.pot`
**Supported Locales (per CLAUDE.md):**
- en_US (English)
- de_DE, de_DE_informal (German - Germany)
- de_CH, de_CH_informal (German - Switzerland)
- fr_CH (French - Switzerland)
- it_CH (Italian - Switzerland)
## Performance Considerations
### Caching
- Twig templates cached in `cache/` directory
- Auto-reload enabled in debug mode
- Optimized Composer autoloader
### Database Queries
- Efficient `WP_Query` for product selection
- Meta queries for SKU filtering
- Taxonomy queries for category/tag filtering
### Asset Loading
- Scripts only on relevant pages
- Minification ready (use build tools)
- Conditional enqueuing
## Extensibility
### Hooks & Filters
**Available Filters:**
- `wc_composable_settings`: Modify settings array
- `woocommerce_product_class`: Custom product class
- `product_type_selector`: Product type registration
**Customization Points:**
- Twig templates (override in theme)
- CSS styling (enqueue custom styles)
- JavaScript behavior (extend object)
### Developer API
```php
// Get composable product
$product = wc_get_product($product_id);
// Check if composable
if ($product->get_type() === 'composable') {
// Get available products
$products = $product->get_available_products();
// Get selection limit
$limit = $product->get_selection_limit();
// Calculate price
$price = $product->calculate_composed_price($selected_ids);
}
```
## Testing Checklist
### Admin Testing
- [ ] Product type appears in dropdown
- [ ] Composable Options tab displays
- [ ] Selection criteria toggle works
- [ ] Meta data saves correctly
- [ ] Settings page accessible
- [ ] Global defaults apply
### Frontend Testing
- [ ] Product selector renders
- [ ] Selection limit enforced
- [ ] Price calculation accurate (both modes)
- [ ] AJAX add-to-cart works
- [ ] Cart displays selections
- [ ] Checkout processes correctly
### Edge Cases
- [ ] Empty criteria (no products)
- [ ] Out of stock products excluded
- [ ] Invalid product selections rejected
- [ ] Multiple cart items unique
- [ ] Session persistence
## Known Limitations
1. **Variable Products:** Currently supports simple products in selection
2. **Grouped Products:** Cannot be used as selectable items
3. **Stock Management:** No automatic stock reduction for selected items
4. **Caching:** Template cache needs manual clearing after updates
## Future Enhancements
Potential features for future versions:
- Variable product support in selection
- Quantity selection per item (not just presence)
- Visual bundle previews
- Advanced pricing rules
- Stock management integration
- Product recommendations
- Selection templates/presets
- Multi-currency support enhancements
## Dependencies
### Runtime
- PHP 8.3+
- WordPress 6.0+
- WooCommerce 8.0+
- Twig 3.0 (via Composer)
### Development
- Composer for dependency management
- WP-CLI for i18n operations (optional)
## Deployment
### Production Checklist
1. Run `composer install --no-dev --optimize-autoloader`
2. Ensure `vendor/` directory is included
3. Ensure `cache/` directory is writable
4. Test on staging environment
5. Clear all caches after activation
6. Verify WooCommerce compatibility
### Release Package
Must include:
- All PHP files
- `vendor/` directory
- Assets (CSS, JS)
- Templates
- Language files
- Documentation
Must exclude:
- `.git/` directory
- `composer.lock`
- Development files
- `wp-core/`, `wp-plugins/` symlinks
## Support & Maintenance
### Code Standards
- WordPress Coding Standards
- WooCommerce best practices
- PSR-4 autoloading
- Inline documentation
### Version Control
- Semantic versioning (MAJOR.MINOR.PATCH)
- Changelog maintained
- Annotated git tags
- Development on `dev` branch
---
**Last Updated:** 2024-12-31
**Maintainer:** Marco Graetsch
**AI Assistant:** Claude.AI (Anthropic)
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