major refactoring adding vendor and customer features

app/exceptions/customer.py

@@ -0,0 +1,102 @@
+# app/exceptions/customer.py
+"""
+Customer management specific exceptions.
+"""
+
+from typing import Any, Dict, Optional
+from .base import (
+    ResourceNotFoundException,
+    ConflictException,
+    ValidationException,
+    AuthenticationException,
+    BusinessLogicException
+)
+
+
+class CustomerNotFoundException(ResourceNotFoundException):
+    """Raised when a customer is not found."""
+
+    def __init__(self, customer_identifier: str):
+        super().__init__(
+            resource_type="Customer",
+            identifier=customer_identifier,
+            message=f"Customer '{customer_identifier}' not found",
+            error_code="CUSTOMER_NOT_FOUND"
+        )
+
+
+class CustomerAlreadyExistsException(ConflictException):
+    """Raised when trying to create a customer that already exists."""
+
+    def __init__(self, email: str):
+        super().__init__(
+            message=f"Customer with email '{email}' already exists",
+            error_code="CUSTOMER_ALREADY_EXISTS",
+            details={"email": email}
+        )
+
+
+class DuplicateCustomerEmailException(ConflictException):
+    """Raised when email already exists for vendor."""
+
+    def __init__(self, email: str, vendor_code: str):
+        super().__init__(
+            message=f"Email '{email}' is already registered for this vendor",
+            error_code="DUPLICATE_CUSTOMER_EMAIL",
+            details={
+                "email": email,
+                "vendor_code": vendor_code
+            }
+        )
+
+
+class CustomerNotActiveException(BusinessLogicException):
+    """Raised when trying to perform operations on inactive customer."""
+
+    def __init__(self, email: str):
+        super().__init__(
+            message=f"Customer account '{email}' is not active",
+            error_code="CUSTOMER_NOT_ACTIVE",
+            details={"email": email}
+        )
+
+
+class InvalidCustomerCredentialsException(AuthenticationException):
+    """Raised when customer credentials are invalid."""
+
+    def __init__(self):
+        super().__init__(
+            message="Invalid email or password",
+            error_code="INVALID_CUSTOMER_CREDENTIALS"
+        )
+
+
+class CustomerValidationException(ValidationException):
+    """Raised when customer data validation fails."""
+
+    def __init__(
+        self,
+        message: str = "Customer validation failed",
+        field: Optional[str] = None,
+        details: Optional[Dict[str, Any]] = None
+    ):
+        super().__init__(
+            message=message,
+            field=field,
+            details=details
+        )
+        self.error_code = "CUSTOMER_VALIDATION_FAILED"
+
+
+class CustomerAuthorizationException(BusinessLogicException):
+    """Raised when customer is not authorized for operation."""
+
+    def __init__(self, customer_email: str, operation: str):
+        super().__init__(
+            message=f"Customer '{customer_email}' not authorized for: {operation}",
+            error_code="CUSTOMER_NOT_AUTHORIZED",
+            details={
+                "customer_email": customer_email,
+                "operation": operation
+            }
+        )