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# src/api/routes/auth.py

from fastapi import APIRouter, HTTPException, status, Depends, Request
from sqlmodel.ext.asyncio.session import AsyncSession

from ...models import UserCreate, UserLogin, Token, UserResponse
from ...core.dependencies import create_access_token
from ...services.user_service import UserService
from ...db.database import get_session
import logging

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/auth", tags=["Authentication"])

@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
async def register(user_data: UserCreate, session: AsyncSession = Depends(get_session)):
    """
    Register a new user.
    
    Args:
        user_data: User registration data (email, name, password)
        
    Returns:
        UserResponse with created user data
        
    Raises:
        HTTPException 400: If email already exists
        HTTPException 500: If database operation fails
    """
    try:
        # Attempt to create user
        user = await UserService.create_user(user_data, session)
        
        if user is None:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Email already registered"
            )
        
        logger.info(f"New user registered: {user.email}")
        return user
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Registration error: {e}", exc_info=True)
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Failed to register user"
        )

@router.post("/login", response_model=Token)
async def login(credentials: UserLogin, request: Request, session: AsyncSession = Depends(get_session)):
    """
    Login and get access token.
    
    Args:
        credentials: User login credentials (email, password)
        request: FastAPI request object (for IP and user agent)
        
    Returns:
        Token with JWT access token
        
    Raises:
        HTTPException 401: If credentials are invalid
        HTTPException 500: If database operation fails
    """
    try:
        # Verify credentials
        user = await UserService.verify_credentials(
            credentials.email,
            credentials.password,
            session,
        )
        
        if user is None:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="Invalid email or password"
            )
        
        # Log the login session
        ip_address = request.client.host if request.client else None
        user_agent = request.headers.get("user-agent")
        
        session_id = await UserService.log_login(
            user_id=user['id'],
            session=session,
            ip_address=ip_address,
            user_agent=user_agent,
        )
        
        # Create JWT token with session ID
        token = create_access_token(
            user_id=user['id'],
            email=user['email']
        )
        
        logger.info(f"User logged in: {user['email']}, session: {session_id}")
        return Token(access_token=token)
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Login error: {e}", exc_info=True)
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Failed to login"
        )