from typing import Annotated

from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer

from app.core.security import decode_access_token
from app.db import SessionDep
from app.models.user import User

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


def get_current_user(session: SessionDep, token: Annotated[str, Depends(oauth2_scheme)]) -> User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    payload = decode_access_token(token)
    if payload is None or payload.get("sub") is None:
        raise credentials_exception
    user = session.get(User, int(payload["sub"]))
    if user is None or not user.is_active:
        raise credentials_exception
    return user


CurrentUser = Annotated[User, Depends(get_current_user)]


def get_current_active_superuser(current_user: CurrentUser) -> User:
    if not current_user.is_superadmin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not enough privileges")
    return current_user


CurrentSuperuser = Annotated[User, Depends(get_current_active_superuser)]