/**
 * @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 {ifEnvSupports} from '../test-util';

function supportsImports() {
  return 'import' in document.createElement('link');
}

if (supportsImports()) {
  describe('HTML Imports', function () {
    const testZone = Zone.current.fork({name: 'test'});

    it('should work with addEventListener', function (done) {
      let link: HTMLLinkElement;

      testZone.run(function () {
        link = document.createElement('link');
        link.rel = 'import';
        link.href = 'someUrl';
        link.addEventListener('error', function () {
          expect(Zone.current).toBe(testZone);
          document.head.removeChild(link);
          done();
        });
      });

      document.head.appendChild(link!);
    });

    function supportsOnEvents() {
      const link = document.createElement('link');
      const linkPropDesc = Object.getOwnPropertyDescriptor(link, 'onerror');
      return !(linkPropDesc && linkPropDesc.value === null);
    }
    (<any>supportsOnEvents).message = 'Supports HTMLLinkElement#onxxx patching';

    ifEnvSupports(supportsOnEvents, function () {
      it('should work with onerror', function (done) {
        let link: HTMLLinkElement;

        testZone.run(function () {
          link = document.createElement('link');
          link.rel = 'import';
          link.href = 'anotherUrl';
          link.onerror = function () {
            expect(Zone.current).toBe(testZone);
            document.head.removeChild(link);
            done();
          };
        });

        document.head.appendChild(link!);
      });

      it('should work with onload', function (done) {
        let link: HTMLLinkElement;

        testZone.run(function () {
          link = document.createElement('link');
          link.rel = 'import';
          link.href = '/base/angular/packages/zone.js/test/assets/import.html';
          link.onload = function () {
            expect(Zone.current).toBe(testZone);
            document.head.removeChild(link);
            done();
          };
        });

        document.head.appendChild(link!);
      });
    });
  });
}
