import Keycloak from 'keycloak-js';
import { env } from '../config/env';

const keycloak = new Keycloak({
  url: env.keycloakUrl,
  realm: env.keycloakRealm,
  clientId: env.keycloakClientId,
});

let initPromise: Promise<boolean> | null = null;
let refreshPromise: Promise<string | null> | null = null;

export async function initKeycloak(): Promise<boolean> {
  if (!initPromise) {
    initPromise = keycloak.init({
      onLoad: 'login-required',
      pkceMethod: 'S256',
      checkLoginIframe: false,
    });
  }

  return initPromise;
}

export async function getAccessToken(): Promise<string | null> {
  await initKeycloak();
  if (!keycloak.authenticated) return null;

  if (!refreshPromise) {
    refreshPromise = keycloak
      .updateToken(30)
      .then(() => keycloak.token ?? null)
      .finally(() => {
        refreshPromise = null;
      });
  }

  return refreshPromise;
}

export function getKeycloak() {
  return keycloak;
}