import uuid

from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from jose import JWTError
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth.security import decode_token
from app.database import get_session
from app.models.user import User

bearer_scheme = HTTPBearer()


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
    session: AsyncSession = Depends(get_session),
) -> User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = decode_token(credentials.credentials)
        user_id_str: str | None = payload.get("sub")
        if user_id_str is None:
            raise credentials_exception
        user_id = uuid.UUID(user_id_str)
    except (JWTError, ValueError):
        raise credentials_exception

    result = await session.execute(select(User).where(User.id == user_id))
    user = result.scalar_one_or_none()
    if user is None or not user.is_active:
        raise credentials_exception
    return user