from __future__ import annotations

from fastapi import HTTPException, Request, status


def get_current_username(request: Request) -> str:
    username = request.session.get("username")
    if not username:
        raise HTTPException(status_code=status.HTTP_303_SEE_OTHER, headers={"Location": "/login"})
    return username


def get_current_username_optional(request: Request) -> str | None:
    return request.session.get("username")