import { v4 as uuid } from "@lukeed/uuid";

import * as cookie from "cookie";

/** @type {import('@sveltejs/kit').Handle} */
export const handle = async ({ event, resolve }) => {
  const cookies = cookie.parse(event.request.headers.get("cookie") || "");
  event.locals.userid = cookies["userid"] || uuid();

  const response = await resolve(event);

  if (!cookies["userid"]) {
    // if this is the first time the user has visited this app,
    // set a cookie so that we recognise them when they return
    response.headers.set(
      "set-cookie",
      cookie.serialize("userid", event.locals.userid, {
        path: "/",
        httpOnly: true,
      })
    );
  }

  return response;
};
