import { NextRequest, NextResponse } from "next/server";
import { API_URL, makeHeaders } from "@/lib/api";

export async function GET(req: NextRequest) {
  const token = req.headers.get("x-auth-token") || "";
  const headers = makeHeaders(token ? `Bearer ${token}` : undefined);

  // 1. Fetch semua provinsi
  const provincesRes = await fetch(`${API_URL}/api/v1.0/provinces`, {
    method: "GET",
    headers,
    cache: "no-store",
  });

  const provincesData = await provincesRes.json().catch(() => ({}));

  if (!provincesRes.ok) {
    return NextResponse.json(provincesData, { status: provincesRes.status });
  }

  const provinces: { id: string; name: string }[] = Array.isArray(provincesData?.rows)
    ? provincesData.rows
    : [];

  // 2. Fetch semua kota secara paralel
  const cityResults = await Promise.all(
    provinces.map(async (province) => {
      const res = await fetch(
        `${API_URL}/api/v1.0/cities?provinceId=${province.id}`,
        { method: "GET", headers, cache: "no-store" }
      );
      const data = await res.json().catch(() => ({}));
      const rows: { id: string; name: string }[] = Array.isArray(data?.rows)
        ? data.rows
        : [];
      return rows.map((city) => ({ ...city, provinceId: province.id }));
    })
  );

  const cities = cityResults.flat();

  return NextResponse.json({ provinces, cities });
}