// functions/api/nomad.js
export async function onRequestPost({ request }) {
  try {
    const { iin } = await request.json();
    if (!iin) {
      return new Response(JSON.stringify({ error: "iin required" }), {
        status: 400, headers: { "content-type": "application/json; charset=utf-8" }
      });
    }

    const form = new FormData();
    form.append("iin", iin);

    const upstream = await fetch("https://nomad.kz/ajax/calc/?action=client_get_wt", {
      method: "POST",
      body: form
    });

    const text = await upstream.text();
    let data = null;
    try { data = JSON.parse(text); } catch {}

    return new Response(JSON.stringify(data ?? { raw: text }), {
      status: upstream.ok ? 200 : upstream.status,
      headers: { "content-type": "application/json; charset=utf-8" }
    });
  } catch (e) {
    return new Response(JSON.stringify({ error: String(e) }), {
      status: 500, headers: { "content-type": "application/json; charset=utf-8" }
    });
  }
}