feat: show errors direclty under the input

Improve error handling for coupon code input. Added a catch block to handle errors when adding a coupon code to the basket. The error message is now displayed directly under the input field, providing a better user experience.

Related: #20 (closed)

Closes #20 (closed)

ajax/frontend/redeem.php

 <?php
 
 /**
- * This file contains package_quiqqer_coupons_ajax_delete
+ * This file contains package_quiqqer_coupons_ajax_frontend_redeem
  */
 
 use QUI\ERP\Coupons\Handler;
@@ -13,6 +13,15 @@
  * @param int $id - CouponCode ID
  * @return bool - success
  */
+
+/**
+ * Redeem a CouponCode
+ * @param string $code - coupon code
+ * @param string $orderHash - Order hash
+ *
+ * @throws QUI\Exception
+ * @throws QUI\ERP\Coupons\CouponCodeException
+ */
 QUI::$Ajax->registerFunction(
     'package_quiqqer_coupons_ajax_frontend_redeem',
     function ($code, $orderHash) {
@@ -23,20 +32,25 @@ function ($code, $orderHash) {
         } catch (QUI\ERP\Coupons\CouponCodeException $Exception) {
             QUI\System\Log::writeDebugException($Exception);
 
-            QUI::getMessagesHandler()->addError($Exception->getMessage());
-
-            return false;
+//            QUI::getMessagesHandler()->addError($Exception->getMessage());
+            throw $Exception;
+//            return false;
         } catch (Exception $Exception) {
             QUI\System\Log::writeException($Exception);
 
-            QUI::getMessagesHandler()->addError(
-                QUI::getLocale()->get(
-                    'quiqqer/coupons',
-                    'message.ajax.general_error'
-                )
-            );
+            throw new QUI\Exception([
+                'quiqqer/coupons',
+                'message.ajax.general_error'
+            ]);
 
-            return false;
+//            QUI::getMessagesHandler()->addError(
+//                QUI::getLocale()->get(
+//                    'quiqqer/coupons',
+//                    'message.ajax.general_error'
+//                )
+//            );
+
+//            return false;
         }
 
         $Order = QUI\ERP\Order\Handler::getInstance()->getOrderByHash($orderHash);
@@ -49,40 +63,55 @@ function ($code, $orderHash) {
 
         foreach ($discounts as $Discount) {
             if (!DiscountEvents::isDiscountUsableWithQuantity($Discount, $productCount)) {
-                QUI::getMessagesHandler()->addError(
-                    QUI::getLocale()->get(
-                        'quiqqer/coupons',
-                        'exception.CouponCode.discounts_invalid'
-                    )
-                );
-
-                return false;
+                throw new QUI\Exception([
+                    'quiqqer/coupons',
+                    'exception.CouponCode.discounts_invalid'
+                ]);
+
+//                QUI::getMessagesHandler()->addError(
+//                    QUI::getLocale()->get(
+//                        'quiqqer/coupons',
+//                        'exception.CouponCode.discounts_invalid'
+//                    )
+//                );
+//
+//                return false;
             }
 
             if ($Discount->getAttribute('scope') === QUI\ERP\Discount\Handler::DISCOUNT_SCOPE_GRAND_TOTAL) {
                 if (!DiscountEvents::isDiscountUsableWithPurchaseValue($Discount, $sum)) {
-                    QUI::getMessagesHandler()->addError(
-                        QUI::getLocale()->get(
-                            'quiqqer/coupons',
-                            'exception.CouponCode.discounts_invalid'
-                        )
-                    );
-
-                    return false;
+                    throw new QUI\Exception([
+                        'quiqqer/coupons',
+                        'exception.CouponCode.discounts_invalid'
+                    ]);
+
+//                    QUI::getMessagesHandler()->addError(
+//                        QUI::getLocale()->get(
+//                            'quiqqer/coupons',
+//                            'exception.CouponCode.discounts_invalid'
+//                        )
+//                    );
+//
+//                    return false;
                 }
 
                 continue;
             }
 
             if (!DiscountEvents::isDiscountUsableWithPurchaseValue($Discount, $subSum)) {
-                QUI::getMessagesHandler()->addError(
-                    QUI::getLocale()->get(
-                        'quiqqer/coupons',
-                        'exception.CouponCode.discounts_invalid'
-                    )
-                );
-
-                return false;
+                throw new QUI\Exception([
+                    'quiqqer/coupons',
+                    'exception.CouponCode.discounts_invalid'
+                ]);
+
+//                QUI::getMessagesHandler()->addError(
+//                    QUI::getLocale()->get(
+//                        'quiqqer/coupons',
+//                        'exception.CouponCode.discounts_invalid'
+//                    )
+//                );
+//
+//                return false;
             }
         }
 
@@ -105,7 +134,7 @@ function ($code, $orderHash) {
             $CouponCode->addToOrder($Order);
         }
 
-        return true;
+//        return true;
     },
     ['code', 'orderHash']
 );