export default {
  async fetch(request) {
    const cors = {
      "Access-Control-Allow-Origin": "*",
      "Access-Control-Allow-Methods": "POST, OPTIONS",
      "Access-Control-Allow-Headers": "Content-Type"
    };

    if (request.method === "OPTIONS") {
      return new Response(null, { headers: cors });
    }

    if (request.method !== "POST") {
      return json({ error: "Method not allowed" }, 405, cors);
    }

    try {
      const body = await request.json();

      const GAS_URL = "https://script.google.com/macros/s/AKfycbzRf-spYfFIIoXk8Vyv0TfcaHFpzD0DZ2nRUZJfTmOV8YXWH1_IgkNM45StZXWPyCDu/exec";

      const res = await fetch(GAS_URL, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(body)
      });

      const text = await res.text();

      let data;
      try {
        data = JSON.parse(text);
      } catch (e) {
        return json({
          error: "Invalid JSON from Apps Script",
          raw: text
        }, 500, cors);
      }

      return json(data, 200, cors);

    } catch (err) {
      return json({ error: err.message }, 500, cors);
    }
  }
};

function json(data, status, headers) {
  return new Response(JSON.stringify(data), {
    status,
    headers: {
      "Content-Type": "application/json",
      ...headers
    }
  });
}