"""Thin Google-Maps geocoding wrapper used only for the admin coord backfill.

Runtime geocoding during scraping happens in the alert service. This module
exists so the web service can lazy-fix flats that were scraped before the
lat/lng migration (or where the alert run skipped geocoding).
"""
import logging
from typing import Optional

from settings import GMAPS_API_KEY

logger = logging.getLogger("web.geocode")

_client = None


def _get_client():
    global _client
    if _client is not None:
        return _client
    if not GMAPS_API_KEY:
        return None
    try:
        import googlemaps
        _client = googlemaps.Client(key=GMAPS_API_KEY)
        return _client
    except Exception as e:
        logger.warning("googlemaps client init failed: %s", e)
        return None


def geocode(address: str) -> Optional[tuple[float, float]]:
    if not address:
        return None
    gm = _get_client()
    if gm is None:
        return None
    try:
        res = gm.geocode(f"{address}, Berlin, Germany")
        if not res:
            return None
        loc = res[0]["geometry"]["location"]
        return float(loc["lat"]), float(loc["lng"])
    except Exception as e:
        logger.warning("geocode failed for %r: %s", address, e)
        return None