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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1648157
-->
<head>
  <title>Test for displayMode</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="property_database.js"></script>
  <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
</head>
<body>
<p id="display">
  <iframe id="iframe" src="http://example.org/tests/layout/style/test/media_queries_iframe2.html"></iframe>
</p>
<pre id="test">
<script class="testbody">
let iframe = document.getElementById("iframe");

// Keep in sync with media_queries_iframe2.html
const DISPLAY_MODES_BACKGROUND_COLOR = {
  'minimal-ui': 'rgb(255, 0, 0)',
  'standalone': 'rgb(0, 128, 0)',
  'fullscreen': 'rgb(0, 0, 255)',
  'browser':    'rgb(255, 255, 0)'
};
const DISPLAY_MODES = Object.keys(DISPLAY_MODES_BACKGROUND_COLOR);

SimpleTest.waitForExplicitFinish();

window.addEventListener("load", async (event) => {
  const wrappedWindow = SpecialPowers.wrap(window);

  function setDisplayMode(mode) {
    wrappedWindow.browsingContext.top.displayMode = mode;
  }

  async function displayModeApplies(mode) {
    let responsePromise = new Promise(resolve => {
      window.addEventListener("message", e => {
        resolve(e.data.backgroundColor);
      }, { once: true });
    });
    iframe.contentWindow.postMessage('get-background-color', '*');
    let response = await responsePromise;
    let expected = DISPLAY_MODES_BACKGROUND_COLOR[mode];

    info(`displayModeApplies: ${response} === ${expected}`);
    return response === expected;
  }

  async function checkIfApplies(q, shouldApply) {
    let message = shouldApply ? "should apply" : "should not apply";
    is((await displayModeApplies(q)), shouldApply, `${q} ${message}`);
  }

  for (let currentMode of DISPLAY_MODES) {
    setDisplayMode(currentMode);

    for (let mode of DISPLAY_MODES) {
      await checkIfApplies(mode, currentMode === mode);
    }
  }

  SimpleTest.finish();
});
</script>
</pre>
</body>
</html>