import { Injectable } from '@angular/core';
import {
  CanActivate, Router, CanLoad, Route, CanActivateChild ,
  ActivatedRouteSnapshot,
  RouterStateSnapshot
} from '@angular/router';

import { Store } from '@ngrx/store';
import { OAuthService } from 'angular-oauth2-oidc';


import * as appCommonReducer from '../reducers/app-common.reducer'
import * as appCommonActions from '../actions/app-common.actions';


@Injectable()
export class AuthGuard implements CanActivate, CanLoad, CanActivateChild  { 
 
  private loginDispatched = false;
  private initialized = false;
  constructor(private oauthService: OAuthService, private router: Router, private store: Store<appCommonReducer.State> ) { }

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    let url: string = state.url;

    return this.checkLogin(url);
  }

  canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    let url: string = state.url;

    return this.checkLogin(url);
  }

  canLoad(route: Route): boolean {
    return this.checkLogin(route.path);
  }

  checkLogin(url: string): boolean {
    if (!this.oauthService.hasValidAccessToken()) {
      if (!this.loginDispatched) {
        this.oauthService.silentRefresh().then(info => {
          this.router.navigateByUrl(url);
        }).catch(error => {
          this.loginDispatched = true;
          this.store.dispatch(new appCommonActions.Login(url));
        })
      }     
      return false;
    } else {
      if (!this.initialized) {
        this.initialized = true;
        this.store.dispatch(new appCommonActions.InitUser());
      }
      return true;
    }
  }
}