<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Test DOMLocalization.prototype.connectRoot with Web Components</title>
  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
  <script type="application/javascript">
  "use strict";
  const l10nReg = new L10nRegistry();
  const fs = [
    { path: "/localization/en-US/mock.ftl", source: `
key1 = Key 1
key2 = Key 2
key3 = Key 3
key4 = Key 4
` },
  ];
  const source = L10nFileSource.createMock("test", "app", ["en-US"], "/localization/{locale}", fs);
  l10nReg.registerSources([source]);

  document.domLoc = new DOMLocalization(
    ["/mock.ftl"],
    false,
    l10nReg,
    ["en-US"],
  );
  document.domLoc.connectRoot(document.documentElement);
  </script>
  <script type="application/javascript">
    // In this test we're going to use two elements - `shadowLabel` and `lightLabel`.
    // We create a new `DOMLocalization` and connect it to the document's root first.
    //
    // Then, we connect and disconnect it on root and element within the shadow DOM and
    // apply new `data-l10n-id` onto both labels.
    // Once the `lightLabel` get a new translation, we check what happened to the `shadowLabel`
    // to ensure that depending on the status of connection between the shadow DOM and the `DOMLocalization`
    // the `shadowLabel` either gets translated or not.

    SimpleTest.waitForExplicitFinish();

    class FluentWidget extends HTMLElement {
      constructor() {
        super();
        const shadowRoot = this.attachShadow({mode: "open"});
        const t = document.querySelector("#fluent-widget-template");
        const instance = t.content.cloneNode(true);
        shadowRoot.appendChild(instance);
      }
      connectedCallback() {
        this.runTests();
      }
      runTests() {
        // First, let's verify that the mutation will not be applied since
        // the shadow DOM is not connected to the `DOMLocalization`.
        let shadowLabel = this.shadowRoot.getElementById("shadowLabel");
        let lightLabel = document.getElementById("lightLabel");

        let verifyL10n = () => {
          if (lightLabel.textContent == "Key 1") {
            is(shadowLabel.textContent, "", "document.l10n content not applied to an element in the shadow DOM");
            window.removeEventListener("MozAfterPaint", verifyL10n);
            this.testPart2();
          }
        };
        window.addEventListener("MozAfterPaint", verifyL10n);

        document.domLoc.setAttributes(shadowLabel, "key1");
        document.domLoc.setAttributes(lightLabel, "key1");
      }
      testPart2() {
        // Next, we connect the shadow root to DOMLocalization and the next attribute
        // change should result in a translation being applied.
        document.domLoc.connectRoot(this.shadowRoot);

        let shadowLabel = this.shadowRoot.getElementById("shadowLabel");
        let lightLabel = document.getElementById("lightLabel");

        // Test that mutation was applied.
        let verifyL10n = () => {
          if (lightLabel.textContent == "Key 2") {
            is(shadowLabel.textContent, "Key 2", "document.l10n content applied to an element in the shadow DOM");
            window.removeEventListener("MozAfterPaint", verifyL10n);
            this.testPart3();
          }
        };
        window.addEventListener("MozAfterPaint", verifyL10n);

        document.domLoc.setAttributes(shadowLabel, "key2");
        document.domLoc.setAttributes(lightLabel, "key2");
      }
      testPart3() {
        // After we disconnect the shadow root, the mutations should
        // not be applied onto the `shadowLabel`.
        document.domLoc.disconnectRoot(this.shadowRoot);

        let shadowLabel = this.shadowRoot.getElementById("shadowLabel");
        let lightLabel = document.getElementById("lightLabel");

        let verifyL10n = () => {
          if (lightLabel.textContent == "Key 3") {
            is(shadowLabel.textContent, "Key 2", "document.l10n content not applied to an element in the shadow DOM");
            window.removeEventListener("MozAfterPaint", verifyL10n);
            this.testPart4();
          }
        };
        window.addEventListener("MozAfterPaint", verifyL10n);

        document.domLoc.setAttributes(shadowLabel, "key3");
        document.domLoc.setAttributes(lightLabel, "key3");
      }
      testPart4() {
        // Finally, we'll connect it back, but this time, we'll connect
        // not the shadow root, but an element within it.
        // This should still result in the `shadowLabel` receiving a new translation.
        document.domLoc.connectRoot(this.shadowRoot.getElementById("shadowDiv"));

        let shadowLabel = this.shadowRoot.getElementById("shadowLabel");
        let lightLabel = document.getElementById("lightLabel");

        // Test that mutation was applied.
        let verifyL10n = () => {
          if (lightLabel.textContent == "Key 4") {
            is(shadowLabel.textContent, "Key 4", "document.l10n content applied to an element in the shadow DOM");
            window.removeEventListener("MozAfterPaint", verifyL10n);
            SimpleTest.finish();
          }
        };
        window.addEventListener("MozAfterPaint", verifyL10n);

        document.domLoc.setAttributes(shadowLabel, "key4");
        document.domLoc.setAttributes(lightLabel, "key4");
      }
    }
    customElements.define("fluent-widget", FluentWidget);
  </script>
</head>
<body>
  <p id="lightLabel"></p>

  <template id="fluent-widget-template">
    <div id="shadowDiv">
      <p id="shadowLabel"></p>
    </div>
  </template>
  <fluent-widget id="widget1"></fluent-widget>
</body>
</html>
