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from __future__ import annotations
from typing import Optional, Dict
import os
import requests
from functools import lru_cache
# Nominatimの利用規約に従ってUAと連絡先を付与
def _ua() -> Dict[str, str]:
email = os.getenv("GEOCODING_EMAIL") or os.getenv("CONTACT_EMAIL") or "example@example.com"
return {"User-Agent": f"HF-Space-Trip-Planner/1.0 (contact: {email})"}
@lru_cache(maxsize=512)
def geocode_city(city: str) -> Optional[Dict[str, object]]:
"""
文字列の都市名から緯度経度を取得（Nominatim / OpenStreetMap）。
成功時: {"lat": float, "lon": float, "display_name": str}
失敗時: None
"""
if not city or not str(city).strip():
return None
q = str(city).strip()
url = "https://nominatim.openstreetmap.org/search"
params = {
"q": q,
"format": "jsonv2",
"addressdetails": 1,
"limit": 1,
}
try:
r = requests.get(url, params=params, headers=_ua(), timeout=20)
r.raise_for_status()
items = r.json()
if not items:
return None
j = items[0]
lat = float(j["lat"])
lon = float(j["lon"])
name = j.get("display_name") or q
return {"lat": lat, "lon": lon, "display_name": name}
except Exception:
return None
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