from typing import Optional
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.ext.asyncio import AsyncSession
from app.db.session import get_db
from app.crud import user as crud_user
from app.services.auth_service import auth_service
from app.models.user import User

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/v1/auth/login")


async def get_current_user(
    token: str = Depends(oauth2_scheme),
    db: AsyncSession = Depends(get_db)
) -> User:
    """Получить текущего пользователя из токена"""
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    
    payload = auth_service.verify_token(token)
    if payload is None:
        raise credentials_exception
    
    user_id: str = payload.get("sub")
    if user_id is None:
        raise credentials_exception
    
    user = await crud_user.get(db, user_id)
    if user is None:
        raise credentials_exception
    
    return user


async def get_current_active_user(
    current_user: User = Depends(get_current_user)
) -> User:
    """Получить активного пользователя"""
    return current_user