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// 注意，CanDeactivate需要用到类型T，所以它不能像CanActive一样，直接就能拿来通用

import { Injectable }           from '@angular/core';
import { Observable }           from 'rxjs/Observable';
import { CanDeactivate,
         ActivatedRouteSnapshot,
         RouterStateSnapshot }  from '@angular/router';

import { CrisisDetailComponent } from './crisis-center/crisis-detail.component';

@Injectable()
export class CanDeactivateGuard implements CanDeactivate<CrisisDetailComponent> {

  canDeactivate(
    component: CrisisDetailComponent,
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): Observable<boolean> | boolean {
    // Get the Crisis Center ID
    console.log(route.paramMap.get('id'));

    // Get the current URL
    console.log(state.url);

    // Allow synchronous navigation (`true`) if no crisis or the crisis is unchanged
    if (!component.crisis || component.crisis.name === component.editName) {
      return true;
    }
    // Otherwise ask the user with the dialog service and return its
    // observable which resolves to true or false when the user decides
    return component.dialogService.confirm('Discard changes?');
  }
}

import { Injectable }       from '@angular/core';
import {
  CanActivate, Router,
  ActivatedRouteSnapshot,
  RouterStateSnapshot,
  CanActivateChild
}                           from '@angular/router';
import { AuthService }      from './auth.service';

@Injectable()
export class AuthGuard implements CanActivate, CanActivateChild {
  constructor(private authService: AuthService, private router: Router) {}

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

    return this.checkLogin(url);
  }

  canActivateChild(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    return this.canActivate(route, state);
  }

  canLoad(route: Route): boolean {
    let url = `/${route.path}`;
  
    return this.checkLogin(url);
  }
}

import { NgModule }             from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import { CrisisCenterHomeComponent } from './crisis-center-home.component';
import { CrisisListComponent }       from './crisis-list.component';
import { CrisisCenterComponent }     from './crisis-center.component';
import { CrisisDetailComponent }     from './crisis-detail.component';

import { CanDeactivateGuard }    from '../can-deactivate-guard.service';

const crisisCenterRoutes: Routes = [
  {
    path: '',
    redirectTo: '/crisis-center',
    pathMatch: 'full'
  },
  {
    path: 'crisis-center',
    component: CrisisCenterComponent,
    children: [
      {
        path: '',
        component: CrisisListComponent,
        children: [
          {
            path: ':id',
            component: CrisisDetailComponent,
            canDeactivate: [CanDeactivateGuard]
          },
          {
            path: '',
            component: CrisisCenterHomeComponent
          }
        ]
      }
    ]
  }
];

@NgModule({
  imports: [
    RouterModule.forChild(crisisCenterRoutes)
  ],
  exports: [
    RouterModule
  ]
})
export class CrisisCenterRoutingModule { }