Auto add product to user cart if referral coupon is applied

functions.php

<?php

add_action( 'woocommerce_before_calculate_totals', 'wpgens_auto_apply_coupons_and_add_product', 10, 1 );
function wpgens_auto_apply_coupons_and_add_product( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;
    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;
    if(!is_user_logged_in())
        return;

    $user_info = get_userdata(get_current_user_id());
    $user_email = $user_info->user_email;

    $args = array(
        'posts_per_page'   => 10,
        'post_type'        => 'shop_coupon',
        'post_status'      => 'publish',
        'meta_query' => array (
        'relation' => 'AND',
            array (
              'key' => 'customer_email',
              'value' => $user_email,
              'compare' => 'LIKE'
            ),
            array (
              'key' => 'usage_count',
              'value' => '0',
              'compare' => '='
            )
        ),
    );

    $raf_coupon_applied = false;
    $coupons = get_posts( $args );
    if($coupons) {
        foreach ( $coupons as $coupon ) {
            if(!$cart->has_discount( $coupon->post_title ) && substr( $coupon->post_title, 0, 3 ) === "RAF" ){
                $cart->add_discount( $coupon->post_title );
                $raf_coupon_applied = true;
            }
        }
    }   

    // If a RAF coupon was applied, add the product
    if ($raf_coupon_applied) {
        $product_id = 123; // Replace with your actual product ID
        $product_in_cart = false;
        foreach ($cart->get_cart() as $cart_item) {
            if ($cart_item['product_id'] == $product_id) {
                $product_in_cart = true;
                break;
            }
        }
        if (!$product_in_cart) {
            $cart->add_to_cart($product_id);
            wc_add_notice('A product has been automatically added to your cart based on your RAF coupon.', 'notice');
        }
    }
}