To_DO: ERROR AFTER LOGGING IN

services/user_service.py

@@ -0,0 +1,73 @@
+import logging
+from typing import Optional, Dict, Any
+from database.interface import DatabaseInterface
+from utils.password_utils import PasswordUtils
+from utils.validation import ValidationUtils
+
+logger = logging.getLogger(__name__)
+
+class UserService:
+    def __init__(self, database: DatabaseInterface):
+        self.db = database
+
+    def create_user(self, username: str, email: str, password: str) -> tuple[bool, list[str]]:
+        errors = []
+
+        # Validierung
+        if not ValidationUtils.validate_username(username):
+            errors.append("Invalid username format")
+
+        if not ValidationUtils.validate_email(email):
+            errors.append("Invalid email format")
+
+        password_valid, password_errors = ValidationUtils.validate_password(password)
+        if not password_valid:
+            errors.extend(password_errors)
+
+        if errors:
+            return False, errors
+
+        # Prüfe auf existierende User
+        if self.get_user_by_email(email):
+            errors.append("Email already registered")
+
+        if self.get_user_by_username(username):
+            errors.append("Username already taken")
+
+        if errors:
+            return False, errors
+
+        # Passwort hashen
+        password_hash = PasswordUtils.hash_password_simple(password)
+
+        # User erstellen
+        try:
+            success = self.db.create_user(username, email.lower(), password_hash)
+            if success:
+                logger.info(f"User created successfully: {email}")
+                return True, []
+            else:
+                logger.warning(f"Failed to create user: {email}")
+                return False, ["Failed to create user"]
+        except Exception as e:
+            logger.error(f"Error creating user: {e}")
+            return False, [f"Database error: {str(e)}"]
+
+
+    def get_user_by_email(self, email: str) -> Optional[Dict[str, Any]]:
+        if not ValidationUtils.validate_email(email):
+            return None
+        try:
+            return self.db.get_user_by_email(email.lower())
+        except Exception as e:
+            logger.error(f"Error getting user by email: {e}")
+            return None
+
+    def get_user_by_username(self, username: str) -> Optional[Dict[str, Any]]:
+        if not ValidationUtils.validate_username(username):
+            return None
+        try:
+            return self.db.get_user_by_username(username)
+        except Exception as e:
+            logger.error(f"Error getting user by username: {e}")
+            return None