migrating vendor frontend to new architecture

app/exceptions/vendor.py

@@ -79,7 +79,7 @@ class UnauthorizedVendorAccessException(AuthorizationException):
 
 
 class InvalidVendorDataException(ValidationException):
-    """Raised when vendor data is invalid."""
+    """Raised when vendor data is invalid or incomplete."""
 
     def __init__(
             self,
@@ -95,21 +95,6 @@ class InvalidVendorDataException(ValidationException):
         self.error_code = "INVALID_VENDOR_DATA"
 
 
-class MaxVendorsReachedException(BusinessLogicException):
-    """Raised when user tries to create more vendors than allowed."""
-
-    def __init__(self, max_vendors: int, user_id: Optional[int] = None):
-        details = {"max_vendors": max_vendors}
-        if user_id:
-            details["user_id"] = user_id
-
-        super().__init__(
-            message=f"Maximum number of vendors reached ({max_vendors})",
-            error_code="MAX_VENDORS_REACHED",
-            details=details,
-        )
-
-
 class VendorValidationException(ValidationException):
     """Raised when vendor validation fails."""
 
@@ -129,3 +114,36 @@ class VendorValidationException(ValidationException):
             details=details,
         )
         self.error_code = "VENDOR_VALIDATION_FAILED"
+
+
+class IncompleteVendorDataException(ValidationException):
+    """Raised when vendor data is missing required fields."""
+
+    def __init__(
+            self,
+            vendor_code: str,
+            missing_fields: list,
+    ):
+        super().__init__(
+            message=f"Vendor '{vendor_code}' is missing required fields: {', '.join(missing_fields)}",
+            details={
+                "vendor_code": vendor_code,
+                "missing_fields": missing_fields,
+            },
+        )
+        self.error_code = "INCOMPLETE_VENDOR_DATA"
+
+
+class MaxVendorsReachedException(BusinessLogicException):
+    """Raised when user tries to create more vendors than allowed."""
+
+    def __init__(self, max_vendors: int, user_id: Optional[int] = None):
+        details = {"max_vendors": max_vendors}
+        if user_id:
+            details["user_id"] = user_id
+
+        super().__init__(
+            message=f"Maximum number of vendors reached ({max_vendors})",
+            error_code="MAX_VENDORS_REACHED",
+            details=details,
+        )