WooCommerce coupons and shipping costs

gistfile1.txt

<?php


 add_action('woocommerce_cart_calculate_fees', 'apply_coupon_to_shipping', 10, 1);
 function apply_coupon_to_shipping($cart) {
     if (is_admin() && !defined('DOING_AJAX')) {
         return;
     }
 
     // Get the applied coupon(s)
     $coupons = $cart->get_applied_coupons();
     
     // Get cart subtotal and shipping cost including tax
     $cart_subtotal = WC()->cart->get_subtotal() + WC()->cart->get_subtotal_tax();
     $shipping_cost = $cart->get_shipping_total() + $cart->get_shipping_tax(); // Shipping total including tax
 
     $cart_subtotal = number_format($cart_subtotal, 2, '.', '');
  
     // Check if there are applied coupons
     if (!empty($coupons)) {
         // Loop through the applied coupons
         foreach ($coupons as $coupon_code) {
             $coupon = new WC_Coupon($coupon_code);
             $original_discount = $coupon->get_amount(); // Get the original discount value
             $discount_type = $coupon->get_discount_type(); // Get discount type (fixed/cart percentage, etc.)
 
             // Format the original discount to 2 decimal places
             $original_discount_formatted = number_format($original_discount, 2, '.', '');
 
             // Get the total discount amount applied by this coupon
             $discount_total = WC()->cart->get_cart_discount_total(); // Total discount amount applied by coupons
 
             // Check if the discount is greater than the cart subtotal
             if ($original_discount_formatted > $cart_subtotal) {
                 $remaining_discount = $original_discount_formatted - $cart_subtotal;
                 $remaining_discount_incl_shipping = $remaining_discount - $shipping_cost;
 
                 if ($remaining_discount_incl_shipping > 0) {
                     $cart->add_fee('Resterend bedrag Coupon lalal', -$shipping_cost);
                 } elseif ($remaining_discount_incl_shipping <= 0) {
                     $need_to_pay = (($cart_subtotal + $shipping_cost) - $original_discount_formatted);
                     
                     $shipping_tax_amount = WC()->cart->get_shipping_tax();
                     $shipping_tax_percentage = (($shipping_tax_amount / ($shipping_cost - $shipping_tax_amount)) * 100);
                     $shipping_tax_percentage = number_format($shipping_tax_percentage, 0, '.', '');
                     $shipping_tax_cal = ((100 + $shipping_tax_percentage) / 100);

                     $shipping_discount_fee = $shipping_cost - $need_to_pay;
                     $shipping_discount_fee = $shipping_discount_fee / $shipping_tax_cal;
              
                     if ($shipping_discount_fee > 0) {
                        $cart->add_fee('Resterend bedrag Coupon', -$shipping_discount_fee, true, 'BTW vrij');
                    }
                 }
             }
         }
     }
 }

?>