Code-Snippets-Functions/Execute a function on a child site/WooCommerce/apply-a-welcome-discount-to-non-on-sale-items.txt

add_action( 'woocommerce_cart_calculate_fees', 'welcome_discount_on_normal_items', 20, 1 );
function welcome_discount_on_normal_items( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $user_id = get_current_user_id();

    if( $user_id > 0 ) {
        $percentage   = 5; // Discount percentage
        $orders_count = (int) wc_get_customer_order_count($user_id);
        $subtotal     = 0; // Initializing

        // Loop through cart items
        foreach( $cart->get_cart() as $cart_item ) {
            // Add non on sale items to subtotal
            if( ! $cart_item['data']->is_on_sale() ) {
                $subtotal += $cart_item['line_subtotal'];
            }
        }

        // Discount percentage amount on non "on sale" items subtotal
        $discount = $subtotal * $percentage / 100;

        // For new customer only that haven't purchase yet
        if( $subtotal > 0 && $orders_count === 0 ) {
            $cart->add_fee( sprintf( __("Discount (%s)", "woocommerce"), $percentage . '%'), -$discount, true );
        }
    }
}