import { DEMO_AUTH_EMAIL_COOKIE, DEMO_AUTH_ROLE_COOKIE } from "@/lib/auth/demoAuth";

export type ClientAuthSnapshot = {
  userId: string;
  userEmail: string | null;
  isAuthed: boolean;
  isTeacher: boolean;
};

const readCookieMap = (): Map<string, string> =>
  new Map(
    document.cookie
      .split(";")
      .map((entry) => entry.trim())
      .filter(Boolean)
      .map((entry) => {
        const [key, ...rest] = entry.split("=");
        return [key, decodeURIComponent(rest.join("="))] as const;
      }),
  );

export const readDemoClientAuth = (): ClientAuthSnapshot => {
  if (typeof document === "undefined") {
    return { userId: "guest", userEmail: null, isAuthed: false, isTeacher: false };
  }

  const cookies = readCookieMap();
  const userEmail = cookies.get(DEMO_AUTH_EMAIL_COOKIE) ?? null;
  const role = cookies.get(DEMO_AUTH_ROLE_COOKIE) ?? "";
  return {
    userId: userEmail ?? "guest",
    userEmail,
    isAuthed: Boolean(userEmail),
    isTeacher: role === "teacher",
  };
};