export default {
  async fetch(request) {

    const corsHeaders = {
      "Access-Control-Allow-Origin": "*",
      "Access-Control-Allow-Methods": "POST, OPTIONS",
      "Access-Control-Allow-Headers": "Content-Type"
    };

    // ----------------------------
    // CORS preflight
    // ----------------------------
    if (request.method === "OPTIONS") {
      return new Response(null, {
        headers: corsHeaders
      });
    }

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

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

      const { roomId, plan, months } = body;

      // ----------------------------
      // Basic validation
      // ----------------------------
      if (!roomId || !plan || !months) {
        return json(
          { error: "Missing required fields" },
          400,
          corsHeaders
        );
      }

      // ----------------------------
      // FORWARD TO APPS SCRIPT
      // ----------------------------
      const GAS_URL = "https://script.google.com/macros/s/AKfycbz9yTPGtk4N7vujV_RwMSLYwiHh3OzFz8slxiZLrt2iTgdjUDHKMgSP1qIC1lWRoMqoMQ/exec";

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

      const data = await gasResponse.json();

      // ----------------------------
      // RETURN CLEAN RESPONSE
      // ----------------------------
      return json(data, 200, corsHeaders);

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


// ----------------------------
// Helper: JSON response
// ----------------------------
function json(data, status = 200, headers = {}) {
  return new Response(JSON.stringify(data), {
    status,
    headers: {
      "Content-Type": "application/json",
      ...headers
    }
  });
}