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Initial implementation of WooCommerce Composable Products plugin
Implemented custom WooCommerce product type allowing customers to build their own product bundles by selecting from predefined sets of products. Features: - Custom "Composable Product" type with admin interface - Product selection by category, tag, or SKU - Configurable selection limits (global and per-product) - Dual pricing modes: fixed price or sum of selected products - Modern responsive frontend with Twig templates - AJAX add-to-cart functionality - Full internationalization support (.pot file) - WooCommerce settings integration - Comprehensive documentation Technical implementation: - PHP 8.3+ with PSR-4 autoloading - Twig 3.0 templating engine via Composer - Vanilla JavaScript with jQuery for frontend interactions - WordPress and WooCommerce hooks for seamless integration - Security: input sanitization, validation, and output escaping - Translation-ready with text domain 'wc-composable-product' Documentation: - README.md: Project overview and features - INSTALL.md: Installation and usage guide - IMPLEMENTATION.md: Technical architecture - CHANGELOG.md: Version history 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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includes/Cart_Handler.php
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181
includes/Cart_Handler.php
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<?php
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/**
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* Cart Handler
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*
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* @package WC_Composable_Product
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*/
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namespace WC_Composable_Product;
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defined('ABSPATH') || exit;
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/**
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* Cart Handler Class
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*
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* Handles adding composable products to cart and calculating prices
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*/
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class Cart_Handler {
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/**
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* Constructor
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*/
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public function __construct() {
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add_filter('woocommerce_add_to_cart_validation', [$this, 'validate_add_to_cart'], 10, 3);
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add_filter('woocommerce_add_cart_item_data', [$this, 'add_cart_item_data'], 10, 2);
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add_filter('woocommerce_get_cart_item_from_session', [$this, 'get_cart_item_from_session'], 10, 2);
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add_filter('woocommerce_get_item_data', [$this, 'display_cart_item_data'], 10, 2);
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add_action('woocommerce_before_calculate_totals', [$this, 'calculate_cart_item_price']);
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add_action('woocommerce_single_product_summary', [$this, 'render_product_selector'], 25);
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}
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/**
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* Render product selector on product page
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*/
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public function render_product_selector() {
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global $product;
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if ($product && $product->get_type() === 'composable') {
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Product_Selector::render($product);
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}
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}
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/**
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* Validate add to cart
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*
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* @param bool $passed Validation status
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* @param int $product_id Product ID
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* @param int $quantity Quantity
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* @return bool
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*/
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public function validate_add_to_cart($passed, $product_id, $quantity) {
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$product = wc_get_product($product_id);
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if (!$product || $product->get_type() !== 'composable') {
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return $passed;
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}
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// Check if selected products are provided
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if (!isset($_POST['composable_products']) || empty($_POST['composable_products'])) {
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wc_add_notice(__('Please select at least one product.', 'wc-composable-product'), 'error');
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return false;
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}
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$selected_products = array_map('absint', $_POST['composable_products']);
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$selection_limit = $product->get_selection_limit();
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// Validate selection limit
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if (count($selected_products) > $selection_limit) {
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/* translators: %d: selection limit */
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wc_add_notice(sprintf(__('You can select a maximum of %d products.', 'wc-composable-product'), $selection_limit), 'error');
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return false;
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}
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if (count($selected_products) === 0) {
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wc_add_notice(__('Please select at least one product.', 'wc-composable-product'), 'error');
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return false;
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}
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// Validate that selected products are valid
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$available_products = $product->get_available_products();
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$available_ids = array_map(function($p) {
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return $p->get_id();
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}, $available_products);
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foreach ($selected_products as $selected_id) {
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if (!in_array($selected_id, $available_ids)) {
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wc_add_notice(__('One or more selected products are not available.', 'wc-composable-product'), 'error');
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return false;
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}
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}
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return $passed;
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}
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/**
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* Add cart item data
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*
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* @param array $cart_item_data Cart item data
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* @param int $product_id Product ID
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* @return array
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*/
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public function add_cart_item_data($cart_item_data, $product_id) {
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$product = wc_get_product($product_id);
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if (!$product || $product->get_type() !== 'composable') {
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return $cart_item_data;
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}
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if (isset($_POST['composable_products']) && !empty($_POST['composable_products'])) {
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$selected_products = array_map('absint', $_POST['composable_products']);
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$cart_item_data['composable_products'] = $selected_products;
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// Make cart item unique
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$cart_item_data['unique_key'] = md5(json_encode($selected_products) . time());
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}
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return $cart_item_data;
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}
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/**
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* Get cart item from session
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*
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* @param array $cart_item Cart item
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* @param array $values Values from session
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* @return array
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*/
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public function get_cart_item_from_session($cart_item, $values) {
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if (isset($values['composable_products'])) {
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$cart_item['composable_products'] = $values['composable_products'];
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}
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return $cart_item;
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}
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/**
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* Display cart item data
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*
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* @param array $item_data Item data
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* @param array $cart_item Cart item
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* @return array
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*/
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public function display_cart_item_data($item_data, $cart_item) {
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if (isset($cart_item['composable_products']) && !empty($cart_item['composable_products'])) {
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$product_names = [];
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foreach ($cart_item['composable_products'] as $product_id) {
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$product = wc_get_product($product_id);
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if ($product) {
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$product_names[] = $product->get_name();
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}
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}
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if (!empty($product_names)) {
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$item_data[] = [
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'key' => __('Selected Products', 'wc-composable-product'),
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'value' => implode(', ', $product_names),
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];
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}
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}
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return $item_data;
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}
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/**
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* Calculate cart item price
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*
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* @param \WC_Cart $cart Cart object
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*/
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public function calculate_cart_item_price($cart) {
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if (is_admin() && !defined('DOING_AJAX')) {
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return;
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}
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foreach ($cart->get_cart() as $cart_item_key => $cart_item) {
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if (isset($cart_item['data']) && $cart_item['data']->get_type() === 'composable') {
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if (isset($cart_item['composable_products'])) {
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$product = $cart_item['data'];
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$price = $product->calculate_composed_price($cart_item['composable_products']);
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$cart_item['data']->set_price($price);
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}
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}
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}
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}
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}
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