major refactoring adding vendor and customer features

app/exceptions/order.py

@@ -0,0 +1,73 @@
+# app/exceptions/order.py
+"""
+Order management specific exceptions.
+"""
+
+from typing import Optional
+from .base import (
+    ResourceNotFoundException,
+    ValidationException,
+    BusinessLogicException
+)
+
+
+class OrderNotFoundException(ResourceNotFoundException):
+    """Raised when an order is not found."""
+
+    def __init__(self, order_identifier: str):
+        super().__init__(
+            resource_type="Order",
+            identifier=order_identifier,
+            message=f"Order '{order_identifier}' not found",
+            error_code="ORDER_NOT_FOUND"
+        )
+
+
+class OrderAlreadyExistsException(ValidationException):
+    """Raised when trying to create a duplicate order."""
+
+    def __init__(self, order_number: str):
+        super().__init__(
+            message=f"Order with number '{order_number}' already exists",
+            error_code="ORDER_ALREADY_EXISTS",
+            details={"order_number": order_number}
+        )
+
+
+class OrderValidationException(ValidationException):
+    """Raised when order data validation fails."""
+
+    def __init__(self, message: str, details: Optional[dict] = None):
+        super().__init__(
+            message=message,
+            error_code="ORDER_VALIDATION_FAILED",
+            details=details
+        )
+
+
+class InvalidOrderStatusException(BusinessLogicException):
+    """Raised when trying to set an invalid order status."""
+
+    def __init__(self, current_status: str, new_status: str):
+        super().__init__(
+            message=f"Cannot change order status from '{current_status}' to '{new_status}'",
+            error_code="INVALID_ORDER_STATUS_CHANGE",
+            details={
+                "current_status": current_status,
+                "new_status": new_status
+            }
+        )
+
+
+class OrderCannotBeCancelledException(BusinessLogicException):
+    """Raised when order cannot be cancelled."""
+
+    def __init__(self, order_number: str, reason: str):
+        super().__init__(
+            message=f"Order '{order_number}' cannot be cancelled: {reason}",
+            error_code="ORDER_CANNOT_BE_CANCELLED",
+            details={
+                "order_number": order_number,
+                "reason": reason
+            }
+        )