import requests

def get_city_name(lat, lon):
    try:
        r = requests.get(
            "https://nominatim.openstreetmap.org/reverse",
            params={"lat": lat, "lon": lon, "format": "json", "zoom": 10, "addressdetails": 1},
            headers={"User-Agent": "AreWeBuriedApp/1.0"}
        )
        r.raise_for_status()
        data = r.json()
        address = data.get("address", {})
        city = address.get("city") or address.get("town") or address.get("village") or address.get("county") or f"{lat:.2f},{lon:.2f}"
        return city
    except Exception as e:
        print("Reverse geocoding error:", e)
        return f"{lat:.2f},{lon:.2f}"