import { browser } from "$app/environment";

const STORAGE_KEY = "bg.token";

function readToken(): string | null {
  if (!browser) {
    return null;
  }
  return localStorage.getItem(STORAGE_KEY);
}

function createAuth() {
  let token = $state<string | null>(readToken());

  return {
    get token() {
      return token;
    },
    get isAuthenticated() {
      return token !== null && token.length > 0;
    },
    login(value: string) {
      token = value;
      if (browser) {
        localStorage.setItem(STORAGE_KEY, value);
      }
    },
    logout() {
      token = null;
      if (browser) {
        localStorage.removeItem(STORAGE_KEY);
      }
    },
  };
}

export const auth = createAuth();