import { NextResponse } from "next/server";
import { fetchServerForecast, parseForecastCoordinate } from "@/lib/server-forecast";

export async function GET(request: Request) {
  const { searchParams } = new URL(request.url);
  const latitude = parseForecastCoordinate(searchParams.get("latitude"), -90, 90);
  const longitude = parseForecastCoordinate(searchParams.get("longitude"), -180, 180);
  if (latitude === null || longitude === null) {
    return NextResponse.json({ error: "Invalid coordinates." }, { status: 400 });
  }

  try {
    return NextResponse.json(await fetchServerForecast(latitude, longitude), {
      headers: { "Cache-Control": "public, s-maxage=900, stale-while-revalidate=1800" },
    });
  } catch {
    return NextResponse.json({ error: "Forecast service is unavailable." }, { status: 502 });
  }
}