Product Form: Show clear error message for duplicated GTIN/UPC/EAN/ISBN (#16146)

Author: itsmeichigo

Modules/Sources/Yosemite/Stores/ProductStore.swift

@@ -1367,6 +1367,7 @@ public enum ProductUpdateError: Error, Equatable {
     case duplicatedSKU
     case invalidSKU
     case invalidGlobalUniqueIdentifier
+    case invalidOrDuplicatedGlobalUniqueID
     case passwordCannotBeUpdated
     case notFoundInStorage
     case variationInvalidImageId
@@ -1393,6 +1394,7 @@ public enum ProductUpdateError: Error, Equatable {
 
     private enum ErrorCode: String {
         case invalidSKU = "product_invalid_sku"
+        case invalidOrDuplicatedGlobalUniqueID = "product_invalid_global_unique_id"
         case variationInvalidImageId = "woocommerce_variation_invalid_image_id"
         case invalidMaxQuantity = "woocommerce_rest_invalid_max_quantity"
         case invalidMinQuantity = "woocommerce_rest_invalid_min_quantity"
@@ -1407,6 +1409,8 @@ public enum ProductUpdateError: Error, Equatable {
                 return .variationInvalidImageId
             case .invalidMaxQuantity, .invalidMinQuantity, .invalidVariationMaxQuantity, .invalidVariationMinQuantity:
                 return .generic(message: message ?? "")
+            case .invalidOrDuplicatedGlobalUniqueID:
+                return .invalidOrDuplicatedGlobalUniqueID
             }
         }
     }
@@ -1425,6 +1429,10 @@ extension ProductUpdateError: LocalizedError {
             return NSLocalizedString("productInventorySettings.invalidGlobalUniqueIdentifier.error",
                                      value: "Please enter only numbers and hyphens (-).",
                                      comment: "The message of the alert when there is an error updating the product global unique identifier")
+        case .invalidOrDuplicatedGlobalUniqueID:
+            return NSLocalizedString("productInventorySettings.error.invalidOrDuplicatedGlobalUniqueID",
+                                     value: "Invalid or duplicated GTIN, UPC, EAN or ISBN.",
+                                     comment: "Error message when saving an invalid or duplicated product global unique ID")
         case .generic(let message):
             return message
         case .unknown(let error):

RELEASE-NOTES.txt

@@ -4,6 +4,7 @@
 23.3
 -----
 - [*] Order details: Display only physical items in the Shipping Labels section. [https://github.com/woocommerce/woocommerce-ios/pull/16127]
+- [*] Product form: Display user-friendly error message when saving duplicated GTIN/UPC/EAN/ISBN. [https://github.com/woocommerce/woocommerce-ios/pull/16146]
 - [internal] Address deprecated view modifiers usage following iOS17 API updates [https://github.com/woocommerce/woocommerce-ios/pull/16080]
 - [***] Performance improvements for users logging in with WordPress.com accounts [https://github.com/woocommerce/woocommerce-ios/pull/16126]
 - [internal] Fix back swipe gesture detection compatibility for iOS26 [https://github.com/woocommerce/woocommerce-ios/pull/16133]