from __future__ import annotations

from fastapi import HTTPException, Request, status

from app.ha.reader import HaReader


def get_ha_reader(request: Request) -> HaReader:
    reader = getattr(request.app.state, "ha_reader", None)
    if not isinstance(reader, HaReader):
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Home Assistant is not configured.",
        )
    return reader