import Keycloak from 'keycloak-js'

const keycloakInstance = new Keycloak()

interface CallbackOneParam<T1 = void, T2 = void> {
  (param1: T1): T2
}
/**
 * Initializes Keycloak instance and calls the provided callback function if successfully authenticated.
 *
 * @param onAuthenticatedCallback
 */
const Login = (onAuthenticatedCallback: CallbackOneParam): void => {
  keycloakInstance
    .init({ onLoad: 'login-required' })
    .then(function (authenticated) {
      authenticated ? onAuthenticatedCallback() : alert('non authenticated')
    })
    .catch((e) => {
      console.dir(e)
      console.log(`keycloak init exception: ${e}`)
    })
}

const UserName = (): string | undefined =>
  keycloakInstance?.tokenParsed?.preferred_username

const Token = (): string | undefined => keycloakInstance?.token
const IdToken = (): string | undefined => keycloakInstance?.idToken

const LogOut = () => keycloakInstance.logout()

/*
const UserRoles = (): string[] | undefined => {
  if (keycloakInstance.resourceAccess === undefined) return undefined;
  if (keycloakInstance.resourceAccess["express-client"] === undefined) return undefined;

  return keycloakInstance.resourceAccess["express-client"].roles;
};
*/
const UserRoles = () => {
  const decoded = DecodeToken()

  if (decoded && decoded.resource_access) {
    return decoded.resource_access[decoded.azp ?? ''].roles
  }
  return []
}

const updateToken = (successCallback: any) =>
  keycloakInstance.updateToken(5).then(successCallback).catch(doLogin)

const doLogin = keycloakInstance.login

const isLoggedIn = () => !!keycloakInstance.token

const DecodeToken = () => {
  return keycloakInstance.tokenParsed
}
const DecodeIdToken = () => {
  return keycloakInstance.idTokenParsed
}

const KeycloakService = {
  CallLogin: Login,
  GetUserName: UserName,
  GetAccesToken: Token,
  GetIdToken: IdToken,
  CallLogOut: LogOut,
  GetUserRoles: UserRoles,
  UpdateToken: updateToken,
  IsLoggedIn: isLoggedIn,
  GetDecodeToken: DecodeToken,
  GetDecodeIdToken: DecodeIdToken,
}

export default KeycloakService