feat: add global weather support

lib/location-utils.ts

@@ -1,6 +1,7 @@
 import type { MeteoStationPosition, SynopStation } from "@/types/imgw";
 import type { LocationSearchResult, SelectedLocation } from "@/types/location";
 import { getCountyTerytForLocation } from "@/lib/warning-regions";
+import { getWeatherRegionForCountryCode } from "@/types/weather-region";
 
 const stationAliases: Record<string, string> = {
   gdansk: "gdanskrebiechowo",
@@ -64,6 +65,12 @@ export function findNearestSynopStation(
     name: location.name,
     province: location.province,
     district: location.district,
+    country: "Polska",
+    countryCode: "PL",
+    admin1: location.province,
+    admin2: location.district,
+    timezone: "Europe/Warsaw",
+    region: "PL",
     countyTeryt: getCountyTerytForLocation(location.province, location.district, location.name),
     latitude: location.latitude,
     longitude: location.longitude,
@@ -72,3 +79,35 @@ export function findNearestSynopStation(
     distanceKm: Math.round(nearest.distanceKm),
   };
 }
+
+export function createSelectedLocation(
+  location: Pick<LocationSearchResult, "name" | "province" | "district" | "country" | "countryCode" | "admin1" | "admin2" | "timezone" | "region" | "latitude" | "longitude">,
+  stations: LocatedSynopStation[],
+): SelectedLocation {
+  const countryCode = location.countryCode?.toUpperCase() ?? null;
+  const region = location.region ?? getWeatherRegionForCountryCode(countryCode);
+  const nearest = region === "PL"
+    ? stations.reduce<{ station: LocatedSynopStation; distanceKm: number } | null>((best, station) => {
+      const distance = distanceKm(location.latitude, location.longitude, station.latitude, station.longitude);
+      return !best || distance < best.distanceKm ? { station, distanceKm: distance } : best;
+    }, null)
+    : null;
+
+  return {
+    name: location.name,
+    province: location.province,
+    district: location.district,
+    country: location.country,
+    countryCode,
+    admin1: location.admin1,
+    admin2: location.admin2,
+    timezone: location.timezone,
+    region,
+    countyTeryt: region === "PL" ? getCountyTerytForLocation(location.province, location.district, location.name) : null,
+    latitude: location.latitude,
+    longitude: location.longitude,
+    stationId: nearest?.station.id ?? null,
+    stationName: nearest?.station.name ?? null,
+    distanceKm: nearest ? Math.round(nearest.distanceKm) : null,
+  };
+}