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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=580313
-->
<head>
  <title>Test Prefetch (bug 580313)</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=580313">Mozilla Bug 580313</a>
<p id="display"></p>
<div id="content" style="display: none">

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<pre id="test">
<script type="application/javascript">

  SimpleTest.waitForExplicitFinish();

  var prefetch = SpecialPowers.Cc["@mozilla.org/prefetch-service;1"].
                   getService(SpecialPowers.Ci.nsIPrefetchService);
  var ios = SpecialPowers.Cc["@mozilla.org/network/io-service;1"].
            getService(SpecialPowers.Ci.nsIIOService);

  is(prefetch.hasMoreElements(), false, "No prefetches at the test start.");

  var linkElem = document.createElement('link');
  linkElem.rel = "prefetch";

  // Href is empty.
  document.head.appendChild(linkElem);
  is(prefetch.hasMoreElements(), false,
     "If href is not a valid uri, a prefetch has not been started.");

  // Change uri of an existing link. Now it is a valid uri and
  // a prefetch should start.
  linkElem.href = "https://example.com/1";
  is(prefetch.hasMoreElements(), true,
     "Setting the href to a valid uri has started a new prefetch.");

  // Removing a link, removes its prefetch.
  document.head.removeChild(linkElem);
  is(prefetch.hasMoreElements(), false,
     "Removing the link has canceled the prefetch.");

  // Add link again.
  document.head.appendChild(linkElem);
  is(prefetch.hasMoreElements(), true,
     "Adding link again, has started the prefetch again.");

  // Changing the href should cancel the current prefetch.
  linkElem.href = "https://example.com/2";
  is(prefetch.hasMoreElements(), true,
     "Changing href, a new prefetch has been started.");
  // To check if "https://example.com/1" prefetch has been canceled, we try to
  // cancel it using PrefetService. Since the prefetch for
  // "https://example.com/1" does not exist, the cancel will throw.
  var cancelError = 0;
  try {
    var uri = ios.newURI("https://example.com/1");
    prefetch.cancelPrefetchPreloadURI(uri, linkElem);
  } catch(e) {
    cancelError = 1;
  }
  is(cancelError, 1, "This prefetch has aleady been canceled");

  // Now cancel the right uri.
  cancelError = 0;
  try {
    var uri = ios.newURI("https://example.com/2");
    prefetch.cancelPrefetchPreloadURI(uri, linkElem);
  } catch(e) {
    cancelError = 1;
  }
  is(cancelError, 0, "This prefetch has been canceled successfully");

  is(prefetch.hasMoreElements(), false, "The prefetch has already been canceled.");

  // Removing the link will do nothing regarding prefetch service.
  document.head.removeChild(linkElem);

  // Adding two links to the same uri and removing one will not remove the other.
  document.head.appendChild(linkElem);
  is(prefetch.hasMoreElements(), true,
     "Added one prefetch for 'https://example.com/2'.");

  var linkElem2 = document.createElement('link');
  linkElem2.rel = "prefetch";
  linkElem2.href = "https://example.com/2";
  document.head.appendChild(linkElem2);
  is(prefetch.hasMoreElements(), true,
     "Added second prefetch for 'https://example.com/2'.");

  // Remove first link element. This should not remove the prefetch.
  document.head.removeChild(linkElem);
  is(prefetch.hasMoreElements(), true,
     "The prefetch for 'https://example.com/2' is still present.");

  // Remove the second link element. This should remove the prefetch.
  document.head.removeChild(linkElem2);
  is(prefetch.hasMoreElements(), false,
     "There is no prefetch.");

  SimpleTest.finish();
</script>
</pre>
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