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add_action('marketking_inside_tag_area', 'custom_product_tag_adder');
function custom_product_tag_adder() {
    $product_id = sanitize_text_field(marketking()->get_pagenr_query_var());
    // Display the form
    ?>
    <div class="custom-tag-adder">
        <input type="text" id="new-tag-names" name="new-tag-names" placeholder="Enter new tags (comma-separated)" style="margin-top:10px">
        <button id="add-new-tags" class="button btn btn-small">Add Tags</button>
    </div>
    <script type="text/javascript">
    jQuery(document).ready(function($) {
        $('#add-new-tags').on('click', function(e) {
            e.preventDefault();
            var tagNames = $('#new-tag-names').val();
            if (tagNames) {
                $.ajax({
                    url: ajaxurl,
                    type: 'POST',
                    data: {
                        action: 'add_product_tags',
                        product_id: <?php echo $product_id; ?>,
                        tag_names: tagNames,
                        security: '<?php echo wp_create_nonce("add-product-tags-nonce"); ?>'
                    },
                    success: function(response) {
                        if (response.success) {
                            alert('Tags added successfully');
                        } else {
                            alert('Error adding tags: ' + response.data);
                        }
                    }
                });
            }
        });
    });
    </script>
    <?php
}

add_action('wp_ajax_add_product_tags', 'add_product_tags_callback');
function add_product_tags_callback() {
    check_ajax_referer('add-product-tags-nonce', 'security');
    $product_id = intval($_POST['product_id']);
    $tag_names = sanitize_text_field($_POST['tag_names']);
    
    if (!current_user_can('edit_product', $product_id)) {
        wp_send_json_error('You do not have permission to edit this product.');
    }
    
    $tag_array = array_map('trim', explode(',', $tag_names));
    $term_ids = array();
    
    foreach ($tag_array as $tag_name) {
        if (empty($tag_name)) continue;
        
        $term = wp_insert_term($tag_name, 'product_tag');
        if (is_wp_error($term)) {
            if ($term->get_error_code() === 'term_exists') {
                $term_ids[] = get_term_by('name', $tag_name, 'product_tag')->term_id;
            } else {
                wp_send_json_error($term->get_error_message());
            }
        } else {
            $term_ids[] = $term['term_id'];
        }
    }
    
    wp_set_object_terms($product_id, $term_ids, 'product_tag', true);
    wp_send_json_success();
}