from __future__ import annotations

from typing import List

from fastapi import APIRouter, HTTPException, Request

from app.ha.models import HaEntitySummary
from app.ha.reader import HaReader
from app.rules.recommender import Recommender

router = APIRouter(prefix="/v1", tags=["entities"])


def _state_ha_reader(request: Request) -> HaReader:
    try:
        return request.app.state.ha_reader
    except AttributeError as exc:
        raise HTTPException(status_code=503, detail="HA-Reader nicht initialisiert.") from exc


def _state_recommender(request: Request) -> Recommender:
    try:
        return request.app.state.recommender
    except AttributeError as exc:
        raise HTTPException(status_code=503, detail="Recommender nicht initialisiert.") from exc


@router.get(
    "/entities",
    summary="Home-Assistant-Entities auflisten",
    description="Gibt eine kompakte Zusammenfassung aller erreichbaren HA-Entitäten zurück.",
    response_model=List[HaEntitySummary],
)
def list_entities(request: Request) -> List[HaEntitySummary]:
    ha_reader = _state_ha_reader(request)
    recommender = _state_recommender(request)
    entities = ha_reader.read_entities()
    recommender.run(entities)
    return entities