yoone-wc-product-bundles/includes/admin/class-yoone-product-bundles-admin.php

<?php
/**
 * Admin: Provides the configuration interface for bundle products (allowed products, min quantity, categories).
 */
defined('ABSPATH') || exit;

class Yoone_Product_Bundles_Admin {
    protected static $instance = null;

    public static function instance() {
        if (null === self::$instance) self::$instance = new self();
        return self::$instance;
    }

    private function __construct() {
        // 添加一个产品数据标签页
        add_filter('woocommerce_product_data_tabs', array($this, 'add_product_data_tab'));
        // 对应的面板内容
        add_action('woocommerce_product_data_panels', array($this, 'render_product_data_panel'));
        // 保存配置
        add_action('woocommerce_admin_process_product_meta', array($this, 'save_product_meta'));
        add_action('woocommerce_process_product_meta', array($this, 'save_product_meta'));
        add_action('save_post_product', array($this, 'save_product_meta'), 15);

        // AJAX: 获取所有 simple product
        add_action('wp_ajax_yoone_get_all_simple_products', array($this, 'ajax_get_all_simple_products'));
    }

    public function add_product_data_tab($tabs) {
        $tabs['yoone_bundle'] = array(
            'label'    => __('Mix and Match', 'yoone-product-bundles'),
            'target'   => 'yoone_bundle_data',
            'class'    => array('show_if_yoone_bundle'), // Only show for 'yoone_bundle' type
            'priority' => 70,
        );
        return $tabs;
    }

    public function render_product_data_panel() {
        global $post;
        $product = wc_get_product($post->ID);
        $config  = Yoone_Product_Bundles::get_bundle_config($product);
        $allowed = $config['allowed_products'];
        $min_qty = $config['min_qty'];
        $cats    = $config['categories'];

        echo '<div id="yoone_bundle_data" class="panel woocommerce_options_panel show_if_yoone_bundle">';
        wp_nonce_field('yoone-bundle-admin-nonce', 'yoone_bundle_admin_nonce_field');

        echo '<div class="options_group">';
        echo '<p>' . esc_html__('Configure the simple products that can be included in the bundle, the minimum quantity, and the category grouping for the frontend display.', 'yoone-product-bundles') . '</p>';

        // Allowed products: use Woo's product search (select2), multiple
        echo '<p class="form-field"><label>' . esc_html__('Allowed Products', 'yoone-product-bundles') . '</label>';
        echo '<button type="button" class="button yoone-add-all-simple-products" style="margin-left: 10px;">' . esc_html__('Add All Simple Products', 'yoone-product-bundles') . '</button>';
        // Search only for products, not variations, to avoid errors
        echo '<select class="wc-product-search" multiple style="width: 90%;" name="yoone_bundle_allowed_products[]" data-placeholder="' . esc_attr__('Search for simple products…', 'yoone-product-bundles') . '" data-action="woocommerce_json_search_products">';
        if (! empty($allowed)) {
            foreach ($allowed as $pid) {
                $p = wc_get_product($pid);
                if ($p) {
                    printf('<option value="%d" selected>%s</option>', $pid, esc_html($p->get_formatted_name()));
                }
            }
        }
        echo '</select>';
        echo '<span class="description">' . esc_html__('Only simple products are supported. Variable products may be supported in a future version.', 'yoone-product-bundles') . '</span>';
        echo '</p>';

        // Minimum bundle quantity
        woocommerce_wp_text_input(array(
            'id'          => 'yoone_bundle_min_quantity',
            'label'       => __('Minimum Quantity', 'yoone-product-bundles'),
            'type'        => 'number',
            'desc_tip'    => true,
            'description' => __('The total quantity of selected items must be greater than or equal to this value to add to the cart.', 'yoone-product-bundles'),
            'value'       => $min_qty,
            'custom_attributes' => array('min' => '0'),
        ));

        // Display categories (product_cat)
        echo '<p class="form-field"><label>' . esc_html__('Display Categories', 'yoone-product-bundles') . '</label>';
        echo '<select class="wc-enhanced-select" multiple style="width: 90%;" name="yoone_bundle_categories[]" data-placeholder="' . esc_attr__('Select categories to group products by…', 'yoone-product-bundles') . '">';
        $terms = get_terms(array('taxonomy' => 'product_cat', 'hide_empty' => false));
        foreach ($terms as $t) {
            $selected = in_array($t->term_id, $cats, true) ? 'selected' : '';
            printf('<option value="%d" %s>%s</option>', $t->term_id, $selected, esc_html($t->name));
        }
        echo '</select>';
        echo '<span class="description">' . esc_html__('Group the allowed products by category on the frontend. Only products matching the selected categories will be shown.', 'yoone-product-bundles') . '</span>';
        echo '</p>';

        echo '</div>'; // options_group
        echo '</div>'; // panel
    }

    public function save_product_meta($post_id) {
        // 无论当前 product 对象类型为何，只要提交了我们的字段，就进行保存。
        // 这可以避免在首次切换产品类型时由于保存顺序问题导致配置未写入。
        $has_fields = isset($_POST['yoone_bundle_allowed_products']) || isset($_POST['yoone_bundle_min_quantity']) || isset($_POST['yoone_bundle_categories']);
        if (! $has_fields) return;

        // 保存 allowed products
        $allowed = isset($_POST['yoone_bundle_allowed_products']) ? (array) $_POST['yoone_bundle_allowed_products'] : array();
        $allowed = array_values(array_filter(array_map('absint', $allowed)));
        // 仅保留 simple 产品ID
        if (! empty($allowed)) {
            $simple_only = array();
            foreach ($allowed as $aid) {
                $p = wc_get_product($aid);
                if ($p && $p->is_type('simple')) {
                    $simple_only[] = $aid;
                }
            }
            $allowed = $simple_only;
        }
        update_post_meta($post_id, Yoone_Product_Bundles::META_ALLOWED_PRODUCTS, $allowed);

        // 保存 min qty
        $min_qty = isset($_POST['yoone_bundle_min_quantity']) ? absint($_POST['yoone_bundle_min_quantity']) : 0;
        update_post_meta($post_id, Yoone_Product_Bundles::META_MIN_QTY, max(0, $min_qty));

        // 保存 categories
        $cats = isset($_POST['yoone_bundle_categories']) ? (array) $_POST['yoone_bundle_categories'] : array();
        $cats = array_values(array_filter(array_map('absint', $cats)));
        update_post_meta($post_id, Yoone_Product_Bundles::META_CATEGORIES, $cats);
    }

    /**
     * AJAX handler: 获取所有已发布的 simple product
     */
    public function ajax_get_all_simple_products() {
        if (! current_user_can('edit_products')) {
            wp_send_json_error('permission_denied', 403);
        }
        check_ajax_referer('yoone-bundle-admin-nonce', 'security');

        $products = wc_get_products(array(
            'type'   => 'simple',
            'status' => 'publish',
            'limit'  => -1,
        ));

        $results = array();
        foreach ($products as $product) {
            $results[] = array(
                'id'   => $product->get_id(),
                'text' => $product->get_formatted_name(),
            );
        }

        wp_send_json_success($results);
    }
}