import { redirect } from "@sveltejs/kit";

import type { PageLoad } from "./$types";

export const load: PageLoad = ({ params, url }) => {
  const room = sanitizeRoom(params.room);
  const name = sanitizeName(url.searchParams.get("name"));

  if (room !== params.room) {
    throw redirect(
      307,
      `/do-examples/chat/${encodeURIComponent(room)}${name === "Guest" ? "" : `?name=${encodeURIComponent(name)}`}`,
    );
  }

  return {
    room,
    name,
  };
};

function sanitizeRoom(value: string | undefined) {
  const room = value
    ?.trim()
    .toLowerCase()
    .replace(/[^a-z0-9-_]/g, "-")
    .slice(0, 48);

  return room || "default";
}

function sanitizeName(value: string | null) {
  const name = value?.trim().slice(0, 40);

  return name || "Guest";
}