export interface CityWeatherLive {
  temperature: number;
  humidity?: number;
  apparentTemperature?: number;
  weatherCode?: number;
  observedAt?: string;
}

export type CityWeatherMap = Record<string, CityWeatherLive>;

/** WMO weather code → 简短展示 */
export function weatherCodeLabel(code?: number, locale: "zh" | "en" = "zh"): string | null {
  if (code == null) return null;
  const zh: Record<number, string> = {
    0: "晴",
    1: "多云",
    2: "多云",
    3: "阴",
    45: "雾",
    48: "雾",
    51: "小雨",
    53: "小雨",
    55: "小雨",
    61: "雨",
    63: "雨",
    65: "大雨",
    71: "雪",
    73: "雪",
    75: "大雪",
    80: "阵雨",
    81: "阵雨",
    82: "暴雨",
    95: "雷雨",
  };
  const en: Record<number, string> = {
    0: "Clear",
    1: "Cloudy",
    2: "Cloudy",
    3: "Overcast",
    45: "Fog",
    48: "Fog",
    51: "Drizzle",
    53: "Drizzle",
    55: "Drizzle",
    61: "Rain",
    63: "Rain",
    65: "Heavy rain",
    71: "Snow",
    73: "Snow",
    75: "Heavy snow",
    80: "Showers",
    81: "Showers",
    82: "Storms",
    95: "Thunder",
  };
  const table = locale === "zh" ? zh : en;
  return table[code] ?? (locale === "zh" ? "天气" : "Weather");
}

export function cityWeatherKey(city: { slug?: string; id?: number; name?: string }): string {
  if (city.slug) return city.slug;
  if (city.id != null) return String(city.id);
  return city.name || "";
}