69 lines
2.9 KiB
TypeScript
69 lines
2.9 KiB
TypeScript
import type { DailyForecast, HourlyForecast, RawForecastSeries, RawWeatherForecast, WeatherForecast } from "@/types/forecast";
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function asArray(value: unknown): unknown[] {
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return Array.isArray(value) ? value : [];
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}
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function readString(series: RawForecastSeries, key: keyof RawForecastSeries, index: number) {
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const value = asArray(series[key])[index];
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return typeof value === "string" && value ? value : null;
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}
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function readNumber(series: RawForecastSeries, key: keyof RawForecastSeries, index: number) {
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const value = asArray(series[key])[index];
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return typeof value === "number" && Number.isFinite(value) ? value : null;
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}
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function normalizeHourlyForecast(series: RawForecastSeries = {}): HourlyForecast[] {
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return asArray(series.time).flatMap((_, index) => {
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const time = readString(series, "time", index);
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if (!time) return [];
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return [{
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time,
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temperature: readNumber(series, "temperature_2m", index),
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feelsLike: readNumber(series, "apparent_temperature", index),
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precipitationProbability: readNumber(series, "precipitation_probability", index),
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precipitation: readNumber(series, "precipitation", index),
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weatherCode: readNumber(series, "weather_code", index),
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windSpeed: readNumber(series, "wind_speed_10m", index),
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}];
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});
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}
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function normalizeDailyForecast(series: RawForecastSeries = {}): DailyForecast[] {
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return asArray(series.time).flatMap((_, index) => {
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const date = readString(series, "time", index);
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if (!date) return [];
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return [{
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date,
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temperatureMax: readNumber(series, "temperature_2m_max", index),
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temperatureMin: readNumber(series, "temperature_2m_min", index),
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precipitationProbability: readNumber(series, "precipitation_probability_max", index),
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precipitation: readNumber(series, "precipitation_sum", index),
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weatherCode: readNumber(series, "weather_code", index),
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sunrise: readString(series, "sunrise", index),
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sunset: readString(series, "sunset", index),
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}];
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});
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}
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function normalizeForecast(raw: RawWeatherForecast): WeatherForecast {
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const latitude = Number(raw.latitude);
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const longitude = Number(raw.longitude);
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if (!Number.isFinite(latitude) || !Number.isFinite(longitude)) throw new Error("Forecast service returned invalid coordinates.");
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return {
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latitude,
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longitude,
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timezone: typeof raw.timezone === "string" ? raw.timezone : "Europe/Warsaw",
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hourly: normalizeHourlyForecast(raw.hourly),
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daily: normalizeDailyForecast(raw.daily),
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};
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}
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export async function fetchForecast(latitude: number, longitude: number, signal?: AbortSignal) {
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const params = new URLSearchParams({ latitude: String(latitude), longitude: String(longitude) });
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const response = await fetch(`/api/forecast?${params}`, { signal });
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if (!response.ok) throw new Error("Unable to load forecast.");
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return normalizeForecast(await response.json() as RawWeatherForecast);
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}
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