feat: add global weather support

app/api/current-weather/route.ts

@@ -0,0 +1,31 @@
+import { NextResponse } from "next/server";
+import { fetchServerCurrentWeather } from "@/lib/server-current-weather";
+import type { WeatherRegion } from "@/types/weather-region";
+
+function parseCoordinate(value: string | null, min: number, max: number) {
+  if (!value?.trim()) return null;
+  const coordinate = Number(value);
+  return Number.isFinite(coordinate) && coordinate >= min && coordinate <= max ? coordinate : null;
+}
+
+function parseRegion(value: string | null): WeatherRegion {
+  return value === "GLOBAL" ? "GLOBAL" : "PL";
+}
+
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const latitude = parseCoordinate(searchParams.get("latitude"), -90, 90);
+  const longitude = parseCoordinate(searchParams.get("longitude"), -180, 180);
+  const region = parseRegion(searchParams.get("region"));
+  if (latitude === null || longitude === null) {
+    return NextResponse.json({ error: "Invalid coordinates." }, { status: 400 });
+  }
+
+  try {
+    return NextResponse.json(await fetchServerCurrentWeather(latitude, longitude, region), {
+      headers: { "Cache-Control": "public, s-maxage=120, stale-while-revalidate=300" },
+    });
+  } catch {
+    return NextResponse.json({ error: region === "PL" ? "IMGW Hybrid service is unavailable." : "Open-Meteo current conditions are unavailable." }, { status: 502 });
+  }
+}