import logging

import requests

logger = logging.getLogger(__name__)


class HomeAssistantClient:
    """Thin wrapper around the Home Assistant REST API.

    Instantiating with url=None or api_key=None produces a disabled client;
    all methods become no-ops that return None.
    """

    def __init__(self, url: str | None, api_key: str | None):
        self._enabled = bool(url and api_key)
        self._base_url = (url or "").rstrip("/")
        self._headers = {"Authorization": f"Bearer {api_key}"} if api_key else {}

    @property
    def enabled(self) -> bool:
        return self._enabled

    def get_state(self, entity_id: str) -> int | None:
        """Fetch the current state of a HA entity and return it as an integer.

        Returns None if HA is not configured, the entity is not found,
        the state is non-numeric, or any network/HTTP error occurs.
        """
        if not self._enabled:
            return None
        url = f"{self._base_url}/api/states/{entity_id}"
        try:
            resp = requests.get(url, headers=self._headers, timeout=10)
            resp.raise_for_status()
            state = resp.json().get("state")
            return int(float(state))
        except (requests.RequestException, ValueError, TypeError, KeyError) as exc:
            logger.warning("HA API error for %s: %s", entity_id, exc)
            return None