// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var fileXHREnabled = function() {
  var xhr = new XMLHttpRequest();
  try {
    xhr.onreadystatechange = function() {};
    xhr.onerror = function() {};
    xhr.open("GET", "nothing.xml", true);
    xhr.send(null);
  } catch (e) {
    return false;
  }
  
  xhr.abort();
  return true;
}();

var officialURL = 'http://code.google.com/chrome/extensions/';

function getCurrentBranch() {
  var branchNames = ['beta', 'dev', 'trunk'];

  if (location.href.indexOf(officialURL) != 0)
    return '';

  var branch = location.href.substring(
      officialURL.length,
      location.href.indexOf('/', officialURL.length));
  if (branchNames.indexOf(branch) == -1)
    return 'stable';

  return branch;
}

// Regenerate page if we are passed the "?regenerate" search param
// or if the user-agent is chrome AND the document is being served
// from the file:/// scheme.
if (window.location.search == "?regenerate" ||
    (navigator.userAgent.indexOf("Chrome") > -1) &&
    (window.location.href.match("^file:")) &&
    fileXHREnabled)    {
  
  // Hide body content initially to minimize flashing.
  document.write('<style id="hider" type="text/css">');
  document.write('body { display:none!important; }');
  document.write('</style>');

  window.onload = window.renderPage;

  window.postRender = function() {
    var elm = document.getElementById("hider");
    elm.parentNode.removeChild(elm);

    // Since populating the page is done asynchronously, the DOM doesn't exist
    // when the browser tries to resolve any #anchors in the URL. So we reset
    // the URL once we're done, which forces the browser to scroll to the anchor
    // as it normally would.
    if (location.hash.length > 1)
      location.href = location.href;
  }
} else if ((navigator.userAgent.indexOf("Chrome") > -1) &&
           (window.location.href.match("^file:")) &&
            !fileXHREnabled) {
  window.onload = function() {
    // Display the warning to use the --allow-file-access-from-files.
    document.getElementById("devModeWarning").style.display = "block";
  }
} else {
  window.onload = function() {
    var currentBranch = getCurrentBranch();
    if (currentBranch == '') {
      document.getElementById('unofficialWarning').style.display = 'block';
      document.getElementById('goToOfficialDocs').onclick = function() {
        location.href = officialURL;
      };
    } else if (currentBranch != 'stable') {
      document.getElementById("branchName").textContent =
          currentBranch.toUpperCase();
      document.getElementById('branchWarning').style.display = 'block';
      document.getElementById('branchChooser').onchange = function() {
        location.href = officialURL + this.value + "/";
      };
    }
  }
}