Create a new gift card product if there are no existing gift card product in the store - By WebTOffee(WebToffee Gift Cards (Basic))

functions.php

<?php //Do not copy this line of code

add_action('admin_init', 'wt_gc_add_demo_giftcard_product');
function wt_gc_add_demo_giftcard_product() {
    $existing_product = get_posts(array(
        'post_type'  => 'product',
        'post_status' => array('publish', 'draft', 'pending', 'private', 'future', 'trash'), 
        'meta_query' => array(
            'relation' => 'AND',
            array(
                'key'     => '_wt_gc_gift_card_product',
                'compare' => 'EXISTS',
            ),
            array(
                'key'     => '_wt_gc_gift_card_product',
                'value'   => '',
                'compare' => '!=',
            ),
        ),
    ));
    if (empty($existing_product)) {
        if (class_exists('Wbte_Woocommerce_Gift_Cards_Free_Common') 
            && method_exists('Wbte_Woocommerce_Gift_Cards_Free_Common', 'update_option') 
            && method_exists('Wbte_Woocommerce_Gift_Cards_Free_Common', 'get_module_id')) {
            
            $product = new WC_Product();
            $product->set_name(__('Gift Card', 'wt-gift-cards-woocommerce'));
            $product->set_regular_price('0');
            $product->set_description(__('This is an automatically created product for Gift card.', 'wt-gift-cards-woocommerce'));
            $product_id = $product->save();
    
            update_post_meta($product_id, '_wt_gc_purchase_options', array('predefined'));
            update_post_meta($product_id, '_wt_gc_amounts', '100,200,300');
            update_post_meta($product_id, '_wt_gc_enable_template', 'yes');
            update_post_meta($product_id, '_wt_gc_gift_card_product', $product_id); // set product ID as meta value
            if (!class_exists('Wbte_Gc_Gift_Card_Free_Admin')) {
                include_once plugin_dir_path(__FILE__) . 'path/to/class-wbte-gc-gift-card-free-admin.php';
            }
            Wbte_Woocommerce_Gift_Cards_Free_Common::update_option(
                'gift_card_products', 
                array($product_id), 
                Wbte_Woocommerce_Gift_Cards_Free_Common::get_module_id('gift_card')
            );

            if (!has_post_thumbnail($product_id)) {
                add_product_default_image($product_id);
            }

            wp_update_post(
                array(
                    'ID'          => $product_id,
                    'post_status' => 'draft',
                )
            ); 
            update_option('wbte_gift_card_product_created', true);
        }
    }
}

function add_product_default_image($product_id) {
    $option_name = 'wt_gc_default_featured_image'; // option name to save $attachment_id
    $attachment_id = absint(get_option($option_name, 0));

    if (0 === $attachment_id) {
        // upload
        $attachment_id = do_image_upload($option_name);
    } elseif (!is_attachment_exists($attachment_id)) {
        // re-upload
        $attachment_id = do_image_upload($option_name);
    }

    if (false !== $attachment_id) {
        set_post_thumbnail($product_id, $attachment_id); // set as featured image
    }
}

function do_image_upload($option_name) {
    $file_name = 'default_featured.png';
    $file_path = plugin_dir_path(__FILE__) . 'assets/images/' . $file_name;

    $file_array = array('name' => $file_name);

    $temp_file_name = wp_tempnam(wp_basename($file_path));

    if ($temp_file_name && copy($file_path, $temp_file_name)) {
        $file_array['tmp_name'] = $temp_file_name;
    }

    if (empty($file_array['tmp_name'])) {
        return false;
    }

    $attachment_id = media_handle_sideload($file_array, 0, __('Gift card', 'wt-gift-cards-woocommerce'));

    if (is_wp_error($attachment_id)) {
        return false;
    }

    update_option($option_name, $attachment_id); // save the attachment id to option

    return $attachment_id;
}

function is_attachment_exists($attachment_id) {
    $attachment = get_post($attachment_id);
    return ($attachment && 'attachment' === $attachment->post_type);
}