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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="/test/common-test-setup.js"></script>
<script src="/bower_components/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/bower_components/webcomponentsjs/webcomponents-lite.js"></script>
<script src="/bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<link rel="import" href="gr-external-style.html">

<test-fixture id="basic">
  <template>
    <gr-external-style name="foo"></gr-external-style>
  </template>
</test-fixture>

<script>
  suite('gr-external-style integration tests', () => {
    const TEST_URL = 'http://some/plugin/url.html';

    let sandbox;
    let element;
    let plugin;

    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();
      stub('gr-external-style', {
        importHref: (url, resolve) => resolve(),
      });
      sandbox.stub(Gerrit, 'awaitPluginsLoaded').returns(Promise.resolve());
    });

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

    test('imports plugin-provided module', async () => {
      lateRegister();
      await new Promise(flush);
      assert.isTrue(element.importHref.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(element.importHref.calledWith(new URL(TEST_URL)));
      assert.isTrue(element._applyStyle.calledWith('some-module'));
    });
  });
</script>