/**
 * @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 {fromEvent, fromEventPattern, Observable} from 'rxjs';

import {isBrowser} from '../../lib/common/utils';
import {ifEnvSupports} from '../test-util';

function isEventTarget() {
  return isBrowser;
}

(isEventTarget as any).message = 'EventTargetTest';

describe('Observable.fromEvent', () => {
  let log: any[];
  const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
  const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
  const triggerZone: Zone = Zone.current.fork({name: 'Trigger Zone'});
  let observable1: Observable<any>;

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

  it(
    'fromEvent EventTarget func callback should run in the correct zone',
    ifEnvSupports(isEventTarget, () => {
      observable1 = constructorZone1.run(() => {
        return fromEvent(document, 'click');
      });

      const clickEvent = document.createEvent('Event');
      clickEvent.initEvent('click', true, true);

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

      triggerZone.run(() => {
        document.dispatchEvent(clickEvent);
      });

      expect(log).toEqual([clickEvent]);
    }),
  );

  it(
    'fromEventPattern EventTarget func callback should run in the correct zone',
    ifEnvSupports(isEventTarget, () => {
      const button = document.createElement('button');
      document.body.appendChild(button);
      observable1 = constructorZone1.run(() => {
        return fromEventPattern(
          (handler: any) => {
            expect(Zone.current.name).toEqual(constructorZone1.name);
            button.addEventListener('click', handler);
            log.push('addListener');
          },
          (handler: any) => {
            expect(Zone.current.name).toEqual(constructorZone1.name);
            button.removeEventListener('click', handler);
            document.body.removeChild(button);
            log.push('removeListener');
          },
        );
      });

      const clickEvent = document.createEvent('Event');
      clickEvent.initEvent('click', false, false);

      const subscriper: any = subscriptionZone.run(() => {
        return observable1.subscribe(
          (result: any) => {
            expect(Zone.current.name).toEqual(subscriptionZone.name);
            log.push(result);
          },
          () => {
            fail('should not call error');
          },
          () => {
            expect(Zone.current.name).toEqual(subscriptionZone.name);
            log.push('completed');
          },
        );
      });

      triggerZone.run(() => {
        button.dispatchEvent(clickEvent);
        subscriper.complete();
      });
      expect(log).toEqual(['addListener', clickEvent, 'completed', 'removeListener']);
    }),
  );
});
