/* Any copyright is dedicated to the public domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

// Test that the onmozbrowsermetachange event for viewmode works.
"use strict";

SimpleTest.waitForExplicitFinish();
browserElementTestHelpers.setEnabledPref(true);
browserElementTestHelpers.addPermission();

function runTest() {
  function loadFrameScript(script) {
    SpecialPowers.getBrowserFrameMessageManager(iframe1)
                 .loadFrameScript('data:,' + script,
                                  /* allowDelayedLoad = */ false);
  }

  let iframe1 = document.createElement('iframe');
  iframe1.setAttribute('mozbrowser', 'true');
  iframe1.src = "http://test/tests/dom/browser-element/mochitest/file_browserElement_Viewmode.html";
  iframe1.addEventListener('mozbrowsermetachange', tests);
  document.body.appendChild(iframe1);

  let numMetaChanges = 0;
  function tests(e) {
    let detail = e.detail;

    switch (numMetaChanges++) {
      case 0: {
        is(detail.name, 'viewmode', 'name matches');
        is(detail.content, 'projection=stereo', 'content matches');
        is(detail.type, 'added', 'type matches');

        let script =
          "var meta = content.document.head.querySelector('meta');" +
          "meta.content = 'projection=mono';";
        loadFrameScript(script);
        break;
      }

      case 1: {
        is(detail.name, 'viewmode', 'name matches');
        is(detail.content, 'projection=mono', 'content matches');
        is(detail.type, 'changed', 'type matches');

        let script =
          "var meta = content.document.head.querySelector('meta');" +
          "meta.parentNode.removeChild(meta);";
        loadFrameScript(script);
        break;
      }

      case 2: {
        is(detail.name, 'viewmode', 'name matches');
        is(detail.content, 'projection=mono', 'content matches');
        is(detail.type, 'removed', 'type matches');

        SimpleTest.finish();
        break;
      }

      default: {
        ok(false, 'Too many metachange events.');
        break;
      }
    }
  };
}

window.addEventListener('testready', runTest);