from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session

from . import models
from .database import get_db
from .security import decode_access_token

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


def get_current_user(
    token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)
) -> models.User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Не удалось подтвердить учётные данные",
        headers={"WWW-Authenticate": "Bearer"},
    )
    payload = decode_access_token(token)
    if payload is None:
        raise credentials_exception
    user_id = payload.get("sub")
    if user_id is None:
        raise credentials_exception
    user = db.query(models.User).filter(models.User.id == int(user_id)).first()
    if user is None or not user.is_active:
        raise credentials_exception
    return user


def require_admin(user: models.User = Depends(get_current_user)) -> models.User:
    if user.role != models.Role.admin:
        raise HTTPException(status_code=403, detail="Требуются права администратора")
    return user