"""Вспомогательные зависимости FastAPI."""

from __future__ import annotations

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

from app.core.security import decode_access_token
from app.db.session import get_db
from app.models.user import User, UserRole


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


async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> User:
    """Находим пользователя по токену."""

    try:
        payload = decode_access_token(token)
    except ValueError as exc:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail=str(exc)) from exc

    email: str | None = payload.get("sub")
    if not email:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Неизвестный токен")

    user = db.query(User).filter(User.email == email).first()
    if not user:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Пользователь не найден")

    return user


async def require_hr(current_user: User = Depends(get_current_user)) -> User:
    """Проверяем, что пользователь HR или администратор."""

    if current_user.role not in {UserRole.HR, UserRole.ADMIN}:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Недостаточно прав")
    return current_user


async def require_admin(current_user: User = Depends(get_current_user)) -> User:
    """Проверяем права администратора."""

    if current_user.role != UserRole.ADMIN:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Только для администраторов")
    return current_user