fix: show night icons for hourly forecast

lib/forecast-utils.ts

@@ -1,7 +1,7 @@
 import type { Language, TranslationKey } from "@/lib/i18n";
 import { translate } from "@/lib/i18n";
 import { DEFAULT_TEMPERATURE_UNIT, DEFAULT_WIND_SPEED_UNIT, formatTemperature, formatWindSpeed } from "@/lib/weather-utils";
-import type { HourlyForecast } from "@/types/forecast";
+import type { DailyForecast, HourlyForecast } from "@/types/forecast";
 import type { TemperatureUnit, WindSpeedUnit } from "@/types/units";
 
 export function getForecastConditionKey(code: number | null): TranslationKey {
@@ -89,6 +89,23 @@ export function getHourlyForecastForDay(hours: HourlyForecast[], date: string) {
   return hours.filter((hour) => hour.time.startsWith(`${date}T`));
 }
 
+export function getDailyForecastForHour(days: DailyForecast[], time: string) {
+  return days.find((day) => time.startsWith(`${day.date}T`)) ?? null;
+}
+
+export function isForecastNight(time: string, day: Pick<DailyForecast, "sunrise" | "sunset"> | null | undefined) {
+  const hourTimestamp = parseForecastHour(time);
+  const sunriseTimestamp = day?.sunrise ? parseForecastHour(day.sunrise) : null;
+  const sunsetTimestamp = day?.sunset ? parseForecastHour(day.sunset) : null;
+
+  if (hourTimestamp !== null && sunriseTimestamp !== null && sunsetTimestamp !== null) {
+    return hourTimestamp < sunriseTimestamp || hourTimestamp >= sunsetTimestamp;
+  }
+
+  const hour = getForecastHourOfDay(time);
+  return hour !== null && (hour < 6 || hour >= 21);
+}
+
 export function isForecastHourPast(time: string) {
   const currentHour = getWarsawForecastHour();
   const hourTimestamp = parseForecastHour(time);