/**
 * @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 {Observable, of } from 'rxjs';
import {distinct, distinctUntilChanged, distinctUntilKeyChanged} from 'rxjs/operators';

describe('Observable.distinct', () => {
  let log: any[];
  let observable1: Observable<any>;

  beforeEach(() => { log = []; });

  it('distinct func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(
        () => { return of (1, 1, 2, 2, 2, 1, 2, 3, 4, 3, 2, 1).pipe(distinct()); });

    subscriptionZone.run(() => {
      observable1.subscribe(
          (result: any) => {
            log.push(result);
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          },
          (err: any) => { fail('should not call error'); },
          () => {
            log.push('completed');
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          });
    });
    expect(log).toEqual([1, 2, 3, 4, 'completed']);
  });

  it('distinctUntilChanged func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(
        () => { return of (1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4).pipe(distinctUntilChanged()); });

    subscriptionZone.run(() => {
      observable1.subscribe(
          (result: any) => {
            log.push(result);
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          },
          (err: any) => { fail('should not call error'); },
          () => {
            log.push('completed');
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          });
    });
    expect(log).toEqual([1, 2, 1, 2, 3, 4, 'completed']);
  });

  it('distinctUntilKeyChanged func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(() => {
      return of ({age: 4, name: 'Foo'}, {age: 7, name: 'Bar'}, {age: 5, name: 'Foo'},
                 {age: 6, name: 'Foo'})
          .pipe(distinctUntilKeyChanged('name'));
    });

    subscriptionZone.run(() => {
      observable1.subscribe(
          (result: any) => {
            log.push(result);
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          },
          (err: any) => { fail('should not call error'); },
          () => {
            log.push('completed');
            expect(Zone.current.name).toEqual(subscriptionZone.name);
          });
    });
    expect(log).toEqual(
        [{age: 4, name: 'Foo'}, {age: 7, name: 'Bar'}, {age: 5, name: 'Foo'}, 'completed']);
  });
});