<?php
add_action('init', function () {

    if (!function_exists('wc_create_attribute')) {
        return;
    }

    $attribute_name = 'Source';
    $attribute_slug = 'source';
    $taxonomy       = 'pa_' . $attribute_slug;


    global $wpdb;

    $exists = $wpdb->get_var(
        $wpdb->prepare(
            "SELECT attribute_id 
             FROM {$wpdb->prefix}woocommerce_attribute_taxonomies 
             WHERE attribute_name = %s",
            $attribute_slug
        )
    );


    if (!$exists) {
        wc_create_attribute([
            'name'         => $attribute_name,
            'slug'         => $attribute_slug,
            'type'         => 'select',
            'order_by'     => 'menu_order',
            'has_archives' => false,
        ]);

        // Clear cache Woo
        delete_transient('wc_attribute_taxonomies');
    }


    if (!taxonomy_exists($taxonomy)) {
        register_taxonomy(
            $taxonomy,
            'product',
            [
                'label'        => $attribute_name,
                'public'       => false,
                'hierarchical' => false,

                'show_ui'      => true,
                'query_var'    => true,
                'rewrite'      => false,

                // Cho phép gán trong Product data → Attributes
                'meta_box_cb'  => 'post_tags_meta_box',
            ]
        );
    }


    foreach (['on_store', 'links'] as $term) {
        if (!term_exists($term, $taxonomy)) {
            wp_insert_term($term, $taxonomy);
        }
    }
});