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

from core.security import decode_access_token
from database.models import User
from database.session import get_db

_bearer_scheme = HTTPBearer()


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(_bearer_scheme),
    db: AsyncSession = Depends(get_db),
) -> User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )

    try:
        user_id_str = decode_access_token(credentials.credentials)
        user_id = int(user_id_str)
    except (jwt.PyJWTError, ValueError):
        raise credentials_exception

    result = await db.execute(select(User).where(User.id == user_id))
    user: User | None = result.scalar_one_or_none()

    if user is None:
        raise credentials_exception

    return user


async def get_current_superuser(
    current_user: User = Depends(get_current_user),
) -> User:
    if not current_user.is_superuser:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Not enough privileges",
        )
    return current_user