updates

Backend/src/services/auth_service.py

@@ -81,6 +81,7 @@ class AuthService:
             "email": user.email,
             "phone": user.phone,
             "avatar": user.avatar,
+            "currency": getattr(user, 'currency', 'VND'),
             "role": user.role.name if user.role else "customer",
             "createdAt": user.created_at.isoformat() if user.created_at else None,
             "updatedAt": user.updated_at.isoformat() if user.updated_at else None,
@@ -265,7 +266,8 @@ class AuthService:
         email: Optional[str] = None,
         phone_number: Optional[str] = None,
         password: Optional[str] = None,
-        current_password: Optional[str] = None
+        current_password: Optional[str] = None,
+        currency: Optional[str] = None
     ) -> dict:
         """Update user profile"""
         user = db.query(User).filter(User.id == user_id).first()
@@ -295,6 +297,12 @@ class AuthService:
             user.email = email
         if phone_number is not None:
             user.phone = phone_number
+        if currency is not None:
+            # Validate currency code (ISO 4217, 3 characters)
+            if len(currency) == 3 and currency.isalpha():
+                user.currency = currency.upper()
+            else:
+                raise ValueError("Invalid currency code. Must be a 3-letter ISO 4217 code (e.g., USD, EUR, VND)")
 
         db.commit()
         db.refresh(user)