FE API: Cart now contains information about the promo code type

src/Model/Cart/CartWithModificationsResult.php

@@ -270,15 +270,18 @@ public function getPayment(): ?Payment
     }
 
     /**
-     * @return string|null
+     * @return \Shopsys\FrontendApiBundle\Model\Cart\PromoCodeData|null
      */
-    public function getPromoCode(): ?string
+    public function getPromoCode(): ?PromoCodeData
     {
         if ($this->cart->getFirstAppliedPromoCode() === null) {
             return null;
         }
 
-        return $this->cart->getFirstAppliedPromoCode()->getCode();
+        return new PromoCodeData(
+            $this->cart->getFirstAppliedPromoCode()->getCode(),
+            $this->cart->getFirstAppliedPromoCode()->getDiscountType(),
+        );
     }
 
     /**

src/Model/Cart/PromoCodeData.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shopsys\FrontendApiBundle\Model\Cart;
+
+class PromoCodeData
+{
+    /**
+     * @param string $code
+     * @param string $type
+     */
+    public function __construct(
+        public readonly string $code,
+        public readonly string $type,
+    ) {
+    }
+}

src/Resources/config/graphql-types/EnumType/PromoCodeTypeEnumDecorator.types.yaml

@@ -0,0 +1,15 @@
+PromoCodeTypeEnumDecorator:
+    type: enum
+    decorator: true
+    config:
+        description: "One of possible promo code types"
+        values:
+            percent:
+                value: '@=constant("Shopsys\\FrameworkBundle\\Model\\Order\\PromoCode\\PromoCodeTypeEnum::DISCOUNT_TYPE_PERCENT")'
+                description: "Discount type percent"
+            nominal:
+                value: '@=constant("Shopsys\\FrameworkBundle\\Model\\Order\\PromoCode\\PromoCodeTypeEnum::DISCOUNT_TYPE_NOMINAL")'
+                description: "Discount type nominal"
+            free_transport_payment:
+                value: '@=constant("Shopsys\\FrameworkBundle\\Model\\Order\\PromoCode\\PromoCodeTypeEnum::DISCOUNT_TYPE_FREE_TRANSPORT_PAYMENT")'
+                description: "Discount type free transport and payment"

src/Resources/config/graphql-types/ModelType/Cart/CartDecorator.types.yaml

@@ -19,7 +19,7 @@ CartDecorator:
                 type: "String"
                 description: "Selected pickup place identifier if provided"
             promoCode:
-                type: "String"
+                type: "PromoCode"
                 description: "Applied promo code if provided"
             modifications:
                 type: "CartModificationsResult!"

src/Resources/config/graphql-types/ModelType/Cart/PromoCodeDecorator.types.yaml

@@ -0,0 +1,11 @@
+PromoCodeDecorator:
+    type: object
+    decorator: true
+    config:
+        fields:
+            code:
+                type: "String!"
+                description: "Code of the promo code"
+            type:
+                type: "PromoCodeTypeEnum!"
+                description: "Type of the promo code"