/**
 * @license
 * Copyright Google LLC 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 {asapScheduler, concat, Observable, range} from 'rxjs';

import {asyncTest} from '../test-util';

describe('Observable.concat', () => {
  let log: any[];
  const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
  const constructorZone2: Zone = Zone.current.fork({name: 'Constructor Zone2'});
  const constructorZone3: Zone = Zone.current.fork({name: 'Constructor Zone3'});
  const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
  let observable1: Observable<any>;
  let observable2: any;

  let concatObservable: any;

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

  it('concat func callback should run in the correct zone', () => {
    observable1 = constructorZone1.run(() => {
      return new Observable((subscriber) => {
        expect(Zone.current.name).toEqual(constructorZone1.name);
        subscriber.next(1);
        subscriber.next(2);
        subscriber.complete();
      });
    });

    observable2 = constructorZone2.run(() => {
      return range(3, 4);
    });

    constructorZone3.run(() => {
      concatObservable = concat(observable1, observable2);
    });

    subscriptionZone.run(() => {
      concatObservable.subscribe((concat: any) => {
        expect(Zone.current.name).toEqual(subscriptionZone.name);
        log.push(concat);
      });
    });

    expect(log).toEqual([1, 2, 3, 4, 5, 6]);
  });

  it(
    'concat func callback should run in the correct zone with scheduler',
    asyncTest((done: any) => {
      const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
      const constructorZone2: Zone = Zone.current.fork({name: 'Constructor Zone2'});
      const constructorZone3: Zone = Zone.current.fork({name: 'Constructor Zone3'});
      const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
      observable1 = constructorZone1.run(() => {
        return new Observable((subscriber) => {
          expect(Zone.current.name).toEqual(constructorZone1.name);
          subscriber.next(1);
          subscriber.next(2);
          subscriber.complete();
        });
      });

      observable2 = constructorZone2.run(() => {
        return range(3, 4);
      });

      constructorZone3.run(() => {
        concatObservable = concat(observable1, observable2, asapScheduler);
      });

      subscriptionZone.run(() => {
        concatObservable.subscribe(
          (concat: any) => {
            expect(Zone.current.name).toEqual(subscriptionZone.name);
            log.push(concat);
          },
          (error: any) => {
            fail('subscribe failed' + error);
          },
          () => {
            expect(Zone.current.name).toEqual(subscriptionZone.name);
            expect(log).toEqual([1, 2, 3, 4, 5, 6]);
            done();
          },
        );
      });

      expect(log).toEqual([]);
    }, Zone.root),
  );
});
