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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-external-style</title>

<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/node_modules/@webcomponents/webcomponentsjs/webcomponents-lite.js"></script>
<script src="/components/wct-browser-legacy/browser.js"></script>
<test-fixture id="basic">
  <template>
    <gr-external-style name="foo"></gr-external-style>
  </template>
</test-fixture>

<script type="module">
import '../../../test/common-test-setup.js';
import './gr-external-style.js';
suite('gr-external-style integration tests', () => {
  const TEST_URL = 'http://some/plugin/url.html';

  let sandbox;
  let element;
  let plugin;
  let importHrefStub;

  const installPlugin = () => {
    if (plugin) { return; }
    Gerrit.install(p => {
      plugin = p;
    }, '0.1', TEST_URL);
  };

  const createElement = () => {
    element = fixture('basic');
    sandbox.spy(element, '_applyStyle');
  };

  /**
   * Installs the plugin, creates the element, registers style module.
   */
  const lateRegister = () => {
    installPlugin();
    createElement();
    plugin.registerStyleModule('foo', 'some-module');
  };

  /**
   * Installs the plugin, registers style module, creates the element.
   */
  const earlyRegister = () => {
    installPlugin();
    plugin.registerStyleModule('foo', 'some-module');
    createElement();
  };

  setup(() => {
    sandbox = sinon.sandbox.create();
    importHrefStub = sandbox.stub().callsArg(1);
    stub('gr-external-style', {
      _importHref: (url, resolve, reject) => {
        importHrefStub(url, resolve, reject);
      },
    });
    sandbox.stub(Gerrit, 'awaitPluginsLoaded').returns(Promise.resolve());
  });

  teardown(() => {
    sandbox.restore();
  });

  test('imports plugin-provided module', async () => {
    lateRegister();
    await new Promise(flush);
    assert.isTrue(importHrefStub.calledWith(new URL(TEST_URL)));
  });

  test('applies plugin-provided styles', async () => {
    lateRegister();
    await new Promise(flush);
    assert.isTrue(element._applyStyle.calledWith('some-module'));
  });

  test('does not double import', async () => {
    earlyRegister();
    await new Promise(flush);
    plugin.registerStyleModule('foo', 'some-module');
    await new Promise(flush);
    const urlsImported =
        element._urlsImported.filter(url => url.toString() === TEST_URL);
    assert.strictEqual(urlsImported.length, 1);
  });

  test('does not double apply', async () => {
    earlyRegister();
    await new Promise(flush);
    plugin.registerStyleModule('foo', 'some-module');
    await new Promise(flush);
    const stylesApplied =
        element._stylesApplied.filter(name => name === 'some-module');
    assert.strictEqual(stylesApplied.length, 1);
  });

  test('loads and applies preloaded modules', async () => {
    earlyRegister();
    await new Promise(flush);
    assert.isTrue(importHrefStub.calledWith(new URL(TEST_URL)));
    assert.isTrue(element._applyStyle.calledWith('some-module'));
  });
});
</script>