text: import { get, set } from "@ember/object";
  import Route from "@ember/routing/route";
  import { inject as service } from "@ember/service";
  
  
  export default Route.extend({
  	auth: service(),
  
  	beforeModel( transition ) {
  		const auth = get( this, "auth" );
  
  		// check if user is successfully logged in
  		if ( get( auth, "session.isLoggedIn" ) ) { return; }
  
  		transition.abort();
  
  		// send user to login form
  		const redirect = () => {
  			const controller = this.controllerFor( "userAuth" );
  			set( controller, "previousTransition", transition );
  			this.transitionTo( "user.auth" );
  		};
  
  		const onLogin = success => {
  			if ( success ) {
  				// send user back to original route
  				transition.retry();
  			} else {
  				redirect();
  			}
  		};
  
  		const check = () => {
  			// login not pending?
  			if ( !get( auth, "session.isPending" ) ) {
  				redirect();
  			} else {
  				// show loading screen
  				this.intermediateTransitionTo( "loading" );
  
  				// unregister onLogin callback as soon as the user switches the route
  				// before the callback has fired
  				this.router.one( "didTransition", function() {
  					auth.off( "login", onLogin );
  				});
  
  				// register callback once
  				auth.one( "login", onLogin );
  			}
  		};
  
  		// session record not yet loaded?
  		if ( !get( auth, "session" ) ) {
  			auth.one( "initialized", check );
  		} else {
  			check();
  		}
  	}
  });
  