63 lines
2.5 KiB
TypeScript
63 lines
2.5 KiB
TypeScript
import { mergeForecastSources } from "@/lib/forecast-merge";
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import type { RawImgwForecastResponse, RawWeatherForecast } from "@/types/forecast";
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import type { WeatherRegion } from "@/types/weather-region";
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const OPEN_METEO_FORECAST_URL = "https://api.open-meteo.com/v1/forecast";
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const IMGW_FORECAST_URL = "https://meteo.imgw.pl/api/v1/forecast/fcapi";
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// This browser token is published by the official meteo.imgw.pl frontend.
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const IMGW_FORECAST_TOKEN = "p4DXKjsYadfBV21TYrDk";
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const OPEN_METEO_TIMEOUT_MS = 12_000;
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const IMGW_TIMEOUT_MS = 5_000;
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export function parseForecastCoordinate(value: string | null, min: number, max: number) {
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if (!value?.trim()) return null;
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const coordinate = Number(value);
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return Number.isFinite(coordinate) && coordinate >= min && coordinate <= max ? coordinate : null;
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}
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async function readImgwPayload(response: Response | null) {
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if (!response?.ok) return null;
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try {
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return (await response.json()) as RawImgwForecastResponse;
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} catch {
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return null;
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}
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}
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export async function fetchServerForecast(latitude: number, longitude: number, region: WeatherRegion = "PL") {
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const openMeteoParams = new URLSearchParams({
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latitude: String(latitude),
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longitude: String(longitude),
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hourly: "temperature_2m,apparent_temperature,precipitation_probability,precipitation,weather_code,wind_speed_10m",
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daily:
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"weather_code,temperature_2m_max,temperature_2m_min,precipitation_probability_max,precipitation_sum,sunrise,sunset",
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timezone: region === "PL" ? "Europe/Warsaw" : "auto",
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forecast_days: "7",
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wind_speed_unit: "ms",
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});
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const imgwParams = new URLSearchParams({
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token: IMGW_FORECAST_TOKEN,
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lat: String(latitude),
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lon: String(longitude),
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m: "alaro",
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});
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const [openMeteoResponse, imgwResponse] = await Promise.all([
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fetch(`${OPEN_METEO_FORECAST_URL}?${openMeteoParams}`, {
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next: { revalidate: 900 },
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signal: AbortSignal.timeout(OPEN_METEO_TIMEOUT_MS),
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}),
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region === "PL"
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? fetch(`${IMGW_FORECAST_URL}?${imgwParams}`, {
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next: { revalidate: 900 },
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signal: AbortSignal.timeout(IMGW_TIMEOUT_MS),
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}).catch(() => null)
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: Promise.resolve(null),
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]);
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if (!openMeteoResponse.ok) throw new Error("Forecast service is unavailable.");
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const openMeteoPayload = (await openMeteoResponse.json()) as RawWeatherForecast;
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const imgwPayload = await readImgwPayload(imgwResponse);
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return mergeForecastSources(openMeteoPayload, imgwPayload, region);
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}
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