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import { Injectable, Output, EventEmitter } from  "@angular/core";
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, Router } from  "@angular/router";
import { Observable } from  "rxjs/Rx";
import { AuthService } from  "./auth.service";
import { StorageService } from  "../shared/storage.service";
import { User } from  "../shared/user.interface";

@Injectable()
export class AuthGuard implements CanActivate {
	@Output() user = new EventEmitter<User>();
	@Output() isAuthenticated = new EventEmitter<boolean>();

constructor(private authService: AuthService, private router: Router, private storageService: StorageService ) { }

canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | boolean {
		
		this.authService.getAuthenticatedUser().subscribe( 
			(response) => {
				
				if (state.url !== '/login' && !response.user) {
					
					this.authService.logout();
					
					return false;
				}
				this.storageService.write('token', response.token);
				this.storageService.write('user', response.user);
			}
		)
		
		this.user.emit(this.storageService.read<User>('user'));
		
		this.isAuthenticated.emit(true);

return true;
	}	
}
// Listening Component Seciton

import { Component, OnInit, Input } from '@angular/core';
import { AuthService } from '../auth/auth.service';
import { SiteService } from '../shared/site.service';
import { StorageService } from '../shared/storage.service';
import { User } from '../shared/user.interface';

@Component({
  selector: 'app-header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.css']
})
export class HeaderComponent implements OnInit {
  @Input() isAuthenticated; //Does not seem to work
  @Input() user: User; //Does not seem to work
  
  builder_logo = null;

constructor(private authService: AuthService, private siteService: SiteService,
            private storageService: StorageService) { }

ngOnInit() {
      this.builder_logo = this.siteService.getBuilderLogo();
  }

onLogout() {
    this.isAuthenticated = false;

this.authService.logout();
  }
}