from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from typing import Optional
from models import User
from schemas import UserLogin, Token
from utils import get_db, authenticate_user, create_access_token

router = APIRouter()

@router.post("/login", response_model=Token)
async def login(user_credentials: UserLogin, db: Session = Depends(get_db)):
    """
    Authenticate user and return access token
    """
    user = authenticate_user(db, user_credentials.username, user_credentials.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    access_token = create_access_token(data={"sub": user.username})
    return {"access_token": access_token, "token_type": "bearer"}