from fastapi import APIRouter, Depends, HTTPException
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from jose import JWTError, jwt
from models.user import Token, User, UserCreate, UserLogin
from services.auth_service import ALGORITHM, SECRET_KEY, auth_service

router = APIRouter()
security = HTTPBearer()


@router.post("/auth/register", response_model=Token)
async def register(user_create: UserCreate):
    try:
        user = auth_service.create_user(user_create)
        return auth_service.get_token(user.username, user_create.password)
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.post("/auth/login", response_model=Token)
async def login(user_login: UserLogin):
    try:
        return auth_service.get_token(user_login.username, user_login.password)
    except ValueError:
        raise HTTPException(status_code=401, detail="Invalid username or password")


def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(security),
) -> User:
    try:
        payload = jwt.decode(
            credentials.credentials, SECRET_KEY, algorithms=[ALGORITHM]
        )
        username: str = payload.get("sub")
        user_id: str = payload.get("user_id")
        if username is None or user_id is None:
            raise HTTPException(status_code=401, detail="Invalid token")

        user = auth_service.get_user_by_username(username)
        if not user or user.id != user_id:
            raise HTTPException(status_code=401, detail="User not found")
        return user
    except JWTError:
        raise HTTPException(status_code=401, detail="Invalid token")


@router.get("/auth/me", response_model=User)
async def get_me(current_user: User = Depends(get_current_user)):
    return current_user