/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Location} from '@angular/common';
import {TestBed, inject} from '@angular/core/testing';

import {ResolveData} from '../src/config';
import {PreActivation, Router} from '../src/router';
import {ChildrenOutletContexts} from '../src/router_outlet_context';
import {ActivatedRouteSnapshot, RouterStateSnapshot, createEmptyStateSnapshot} from '../src/router_state';
import {DefaultUrlSerializer} from '../src/url_tree';
import {TreeNode} from '../src/utils/tree';
import {RouterTestingModule} from '../testing/src/router_testing_module';

describe('Router', () => {
  describe('resetRootComponentType', () => {
    class NewRootComponent {}

    beforeEach(() => { TestBed.configureTestingModule({imports: [RouterTestingModule]}); });

    it('should not change root route when updating the root component', () => {
      const r: Router = TestBed.get(Router);
      const root = r.routerState.root;

      r.resetRootComponentType(NewRootComponent);

      expect(r.routerState.root).toBe(root);
    });
  });

  describe('setUpLocationChangeListener', () => {
    beforeEach(() => { TestBed.configureTestingModule({imports: [RouterTestingModule]}); });

    it('should be indempotent', inject([Router, Location], (r: Router, location: Location) => {
         r.setUpLocationChangeListener();
         const a = (<any>r).locationSubscription;
         r.setUpLocationChangeListener();
         const b = (<any>r).locationSubscription;

         expect(a).toBe(b);

         r.dispose();
         r.setUpLocationChangeListener();
         const c = (<any>r).locationSubscription;

         expect(c).not.toBe(b);
       }));
  });

  describe('PreActivation', () => {
    const serializer = new DefaultUrlSerializer();
    const inj = {get: (token: any) => () => `${token}_value`};
    let empty: RouterStateSnapshot;

    beforeEach(() => { empty = createEmptyStateSnapshot(serializer.parse('/'), null !); });

    it('should resolve data', () => {
      const r = {data: 'resolver'};
      const n = createActivatedRouteSnapshot('a', {resolve: r});
      const s = new RouterStateSnapshot('url', new TreeNode(empty.root, [new TreeNode(n, [])]));

      checkResolveData(s, empty, inj, () => {
        expect(s.root.firstChild !.data).toEqual({data: 'resolver_value'});
      });
    });

    it('should wait for the parent resolve to complete', () => {
      const parentResolve = {data: 'resolver'};
      const childResolve = {};

      const parent = createActivatedRouteSnapshot(null !, {resolve: parentResolve});
      const child = createActivatedRouteSnapshot('b', {resolve: childResolve});

      const s = new RouterStateSnapshot(
          'url', new TreeNode(empty.root, [new TreeNode(parent, [new TreeNode(child, [])])]));

      const inj = {get: (token: any) => () => Promise.resolve(`${token}_value`)};

      checkResolveData(s, empty, inj, () => {
        expect(s.root.firstChild !.firstChild !.data).toEqual({data: 'resolver_value'});
      });
    });

    it('should copy over data when creating a snapshot', () => {
      const r1 = {data: 'resolver1'};
      const r2 = {data: 'resolver2'};

      const n1 = createActivatedRouteSnapshot('a', {resolve: r1});
      const s1 = new RouterStateSnapshot('url', new TreeNode(empty.root, [new TreeNode(n1, [])]));
      checkResolveData(s1, empty, inj, () => {});

      const n21 = createActivatedRouteSnapshot('a', {resolve: r1});
      const n22 = createActivatedRouteSnapshot('b', {resolve: r2});
      const s2 = new RouterStateSnapshot(
          'url', new TreeNode(empty.root, [new TreeNode(n21, [new TreeNode(n22, [])])]));
      checkResolveData(s2, s1, inj, () => {
        expect(s2.root.firstChild !.data).toEqual({data: 'resolver1_value'});
        expect(s2.root.firstChild !.firstChild !.data).toEqual({data: 'resolver2_value'});
      });
    });
  });
});

function checkResolveData(
    future: RouterStateSnapshot, curr: RouterStateSnapshot, injector: any, check: any): void {
  const p = new PreActivation(future, curr, injector);
  p.traverse(new ChildrenOutletContexts());
  p.resolveData().subscribe(check, (e) => { throw e; });
}

function createActivatedRouteSnapshot(cmp: string, extra: any = {}): ActivatedRouteSnapshot {
  return new ActivatedRouteSnapshot(
      <any>[], {}, <any>null, <any>null, <any>null, <any>null, <any>cmp, <any>{}, <any>null, -1,
      extra.resolve);
}