61 lines
2 KiB
TypeScript
61 lines
2 KiB
TypeScript
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import { fetchJson } from "./http";
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import type { Place } from "./types";
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/**
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* Turns a city name into coordinates (and coordinates back into a name).
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*
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* OpenWeather's geocoder is used when its key is set; otherwise we fall back
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* to Open-Meteo's free geocoder so search still works with zero keys.
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*/
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interface OwmPlace {
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name: string;
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state?: string;
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country: string;
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lat: number;
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lon: number;
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}
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interface OpenMeteoGeocodeResponse {
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results?: { name: string; admin1?: string; country_code: string; latitude: number; longitude: number }[];
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}
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const OWM_GEO = "https://api.openweathermap.org/geo/1.0";
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function fromOwm(place: OwmPlace): Place {
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return { name: place.name, region: place.state, country: place.country, lat: place.lat, lon: place.lon };
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}
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export async function searchPlaces(query: string): Promise<Place[]> {
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const key = process.env.OPENWEATHER_API_KEY?.trim();
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const q = encodeURIComponent(query.slice(0, 120));
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if (key) {
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const places = await fetchJson<OwmPlace[]>(`${OWM_GEO}/direct?q=${q}&limit=5&appid=${key}`, "OpenWeather");
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return places.map(fromOwm);
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}
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const data = await fetchJson<OpenMeteoGeocodeResponse>(
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`https://geocoding-api.open-meteo.com/v1/search?name=${q}&count=5`,
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"Open-Meteo",
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);
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return (data.results ?? []).map((r) => ({
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name: r.name,
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region: r.admin1,
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country: r.country_code,
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lat: r.latitude,
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lon: r.longitude,
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}));
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}
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/** Used by "Use my location". Without an OpenWeather key we can't name the spot. */
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export async function reversePlace(lat: number, lon: number): Promise<Place> {
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const fallback: Place = { name: "Your location", lat, lon };
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const key = process.env.OPENWEATHER_API_KEY?.trim();
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if (!key) return fallback;
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const places = await fetchJson<OwmPlace[]>(`${OWM_GEO}/reverse?lat=${lat}&lon=${lon}&limit=1&appid=${key}`, "OpenWeather");
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// Keep the user's exact coordinates rather than the city centre's.
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return places[0] ? { ...fromOwm(places[0]), lat, lon } : fallback;
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}
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