import {Injectable} from '@angular/core';
import { Router } from '@angular/router';
import {AppService} from '../services/app.service';
import {Subscription} from 'rxjs/index';
import {ILoginState} from '../model/virtual/login-state';

@Injectable()
export class RouteInterceptor  {
    private loginSub: Subscription;
    private loginState: ILoginState;

    /**
     * Constructor of router service
     */
    constructor(private router: Router, private appService: AppService) {
        // Observe login state
        this.loginSub = this.appService.getLoginState$().subscribe(
            data => this.loginState = data);
    }

    /**
     * Checks if user is logged in and redirects to login page if not
     * @returns {boolean}
     */
    canActivate(): boolean {
        if (this.loginState == null || !this.loginState.isLoggedIn) {
            this.router.navigate(['./login']);
            return false;
        }
        return true;
    }
}