wc-composable-product/includes/Admin/Product_Data.php

<?php
/**
 * Product Data Tab
 *
 * @package WC_Composable_Product
 */

namespace WC_Composable_Product\Admin;

defined('ABSPATH') || exit;

/**
 * Product Data Tab Class
 */
class Product_Data {
    /**
     * Constructor
     */
    public function __construct() {
        add_filter('woocommerce_product_data_tabs', [$this, 'add_product_data_tab']);
        add_action('woocommerce_product_data_panels', [$this, 'add_product_data_panel']);
        add_action('woocommerce_process_product_meta_composable', [$this, 'save_product_data']);
        add_action('woocommerce_product_options_general_product_data', [$this, 'add_general_fields']);
    }

    /**
     * Add composable products tab
     *
     * @param array $tabs Product data tabs
     * @return array
     */
    public function add_product_data_tab($tabs) {
        $tabs['composable'] = [
            'label' => __('Composable Options', 'wc-composable-product'),
            'target' => 'composable_product_data',
            'class' => ['show_if_composable'],
            'priority' => 21,
        ];
        return $tabs;
    }

    /**
     * Add fields to general tab
     */
    public function add_general_fields() {
        global $product_object;

        if ($product_object && $product_object->get_type() === 'composable') {
            echo '<div class="options_group show_if_composable">';

            woocommerce_wp_text_input([
                'id' => '_composable_selection_limit',
                'label' => __('Selection Limit', 'wc-composable-product'),
                'description' => __('Maximum number of items customers can select. Leave empty to use global default.', 'wc-composable-product'),
                'desc_tip' => true,
                'type' => 'number',
                'custom_attributes' => [
                    'min' => '1',
                    'step' => '1',
                ],
            ]);

            woocommerce_wp_select([
                'id' => '_composable_pricing_mode',
                'label' => __('Pricing Mode', 'wc-composable-product'),
                'description' => __('How to calculate the price. Leave empty to use global default.', 'wc-composable-product'),
                'desc_tip' => true,
                'options' => [
                    '' => __('Use global default', 'wc-composable-product'),
                    'sum' => __('Sum of selected products', 'wc-composable-product'),
                    'fixed' => __('Fixed price', 'wc-composable-product'),
                ],
            ]);

            echo '</div>';
        }
    }

    /**
     * Add product data panel
     */
    public function add_product_data_panel() {
        global $post;
        ?>
        <div id="composable_product_data" class="panel woocommerce_options_panel hidden">
            <div class="options_group">
                <?php
                woocommerce_wp_select([
                    'id' => '_composable_criteria_type',
                    'label' => __('Selection Criteria', 'wc-composable-product'),
                    'description' => __('How to select available products.', 'wc-composable-product'),
                    'desc_tip' => true,
                    'options' => [
                        'category' => __('By Category', 'wc-composable-product'),
                        'tag' => __('By Tag', 'wc-composable-product'),
                        'sku' => __('By SKU', 'wc-composable-product'),
                    ],
                    'value' => get_post_meta($post->ID, '_composable_criteria_type', true) ?: 'category',
                ]);
                ?>
            </div>

            <div class="options_group composable_criteria_group" id="composable_criteria_category">
                <p class="form-field">
                    <label for="_composable_categories"><?php esc_html_e('Select Categories', 'wc-composable-product'); ?></label>
                    <select id="_composable_categories" name="_composable_categories[]" class="wc-enhanced-select" multiple="multiple" style="width: 50%;">
                        <?php
                        $selected_categories = get_post_meta($post->ID, '_composable_categories', true) ?: [];
                        $categories = get_terms(['taxonomy' => 'product_cat', 'hide_empty' => false]);
                        foreach ($categories as $category) {
                            printf(
                                '<option value="%s" %s>%s</option>',
                                esc_attr($category->term_id),
                                selected(in_array($category->term_id, (array) $selected_categories), true, false),
                                esc_html($category->name)
                            );
                        }
                        ?>
                    </select>
                    <span class="description"><?php esc_html_e('Select product categories to include.', 'wc-composable-product'); ?></span>
                </p>
            </div>

            <div class="options_group composable_criteria_group" id="composable_criteria_tag" style="display: none;">
                <p class="form-field">
                    <label for="_composable_tags"><?php esc_html_e('Select Tags', 'wc-composable-product'); ?></label>
                    <select id="_composable_tags" name="_composable_tags[]" class="wc-enhanced-select" multiple="multiple" style="width: 50%;">
                        <?php
                        $selected_tags = get_post_meta($post->ID, '_composable_tags', true) ?: [];
                        $tags = get_terms(['taxonomy' => 'product_tag', 'hide_empty' => false]);
                        foreach ($tags as $tag) {
                            printf(
                                '<option value="%s" %s>%s</option>',
                                esc_attr($tag->term_id),
                                selected(in_array($tag->term_id, (array) $selected_tags), true, false),
                                esc_html($tag->name)
                            );
                        }
                        ?>
                    </select>
                    <span class="description"><?php esc_html_e('Select product tags to include.', 'wc-composable-product'); ?></span>
                </p>
            </div>

            <div class="options_group composable_criteria_group" id="composable_criteria_sku" style="display: none;">
                <?php
                woocommerce_wp_textarea_input([
                    'id' => '_composable_skus',
                    'label' => __('Product SKUs', 'wc-composable-product'),
                    'description' => __('Enter product SKUs separated by commas.', 'wc-composable-product'),
                    'desc_tip' => true,
                    'placeholder' => __('SKU-1, SKU-2, SKU-3', 'wc-composable-product'),
                ]);
                ?>
            </div>
        </div>
        <?php
    }

    /**
     * Save product data
     *
     * @param int $post_id Post ID
     */
    public function save_product_data($post_id) {
        // Save selection limit
        $selection_limit = isset($_POST['_composable_selection_limit']) ? absint($_POST['_composable_selection_limit']) : '';
        update_post_meta($post_id, '_composable_selection_limit', $selection_limit);

        // Save pricing mode
        $pricing_mode = isset($_POST['_composable_pricing_mode']) ? sanitize_text_field($_POST['_composable_pricing_mode']) : '';
        update_post_meta($post_id, '_composable_pricing_mode', $pricing_mode);

        // Save criteria type
        $criteria_type = isset($_POST['_composable_criteria_type']) ? sanitize_text_field($_POST['_composable_criteria_type']) : 'category';
        update_post_meta($post_id, '_composable_criteria_type', $criteria_type);

        // Save categories
        $categories = isset($_POST['_composable_categories']) ? array_map('absint', $_POST['_composable_categories']) : [];
        update_post_meta($post_id, '_composable_categories', $categories);

        // Save tags
        $tags = isset($_POST['_composable_tags']) ? array_map('absint', $_POST['_composable_tags']) : [];
        update_post_meta($post_id, '_composable_tags', $tags);

        // Save SKUs
        $skus = isset($_POST['_composable_skus']) ? sanitize_textarea_field($_POST['_composable_skus']) : '';
        update_post_meta($post_id, '_composable_skus', $skus);
    }
}