/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

var gActiveLanguages;
var gLanguages;
var gLanguageNames = [];
var gLanguageTitles = {};

function Startup()
{
  gActiveLanguages = document.getElementById("activeLanguages");
  // gLanguages stores the ordered list of languages, due to the nature
  // of childNodes it is live and updates automatically.
  gLanguages = gActiveLanguages.childNodes;

  ReadAvailableLanguages();
}

function AddLanguage()
{
  document.documentElement.openSubDialog("chrome://communicator/content/pref/pref-languages-add.xul", "addlangwindow", gLanguageNames);
}

function ReadAvailableLanguages()
{
  var i = 0;
  var languagesBundle = document.getElementById("languageNamesBundle");
  var prefLangBundle = document.getElementById("prefLangBundle");
  var regionsBundle = document.getElementById("regionNamesBundle");
  var langStrings = document.getElementById("acceptedBundle").strings;

  while (langStrings.hasMoreElements())
  {
    // Progress through the bundle.
    var curItem = langStrings.getNext();

    if (!(curItem instanceof Ci.nsIPropertyElement))
      break;

    var stringNameProperty = curItem.key.split('.');

    var str = stringNameProperty[0];
    if (str && stringNameProperty[1] == 'accept')
    {
      var stringLangRegion = str.split('-');

      if (stringLangRegion[0])
      {
        var language = "";
        var region = null;

        try
        {
          language = languagesBundle.getString(stringLangRegion[0]);
        }
        catch (ex) {}

        if (stringLangRegion.length > 1)
        {
          try
          {
            region = regionsBundle.getString(stringLangRegion[1]);
          }
          catch (ex) {}
        }

        var title;
        if (region)
          title = prefLangBundle.getFormattedString("languageRegionCodeFormat",
                                                    [language, region, str]);
        else
          title = prefLangBundle.getFormattedString("languageCodeFormat",
                                                    [language, str]);
        gLanguageTitles[str] = title;
        if (curItem.value == "true")
          gLanguageNames.push([title, str]);
      }
    }
  }

  // Sort on first element.
  gLanguageNames.sort(
    function compareFn(a, b)
    {
      return a[0].localeCompare(b[0]);
    }
  );
}

function ReadActiveLanguages()
{
  var arrayOfPrefs = document.getElementById("intl.accept_languages").value
                             .toLowerCase().split(/\s*,\s*/);

  // No need to rebuild listitems if languages in prefs and listitems match.
  if (InSync(arrayOfPrefs))
   return;

  while (gActiveLanguages.hasChildNodes())
    gActiveLanguages.lastChild.remove();

  arrayOfPrefs.forEach(
    function(aKey)
    {
      if (aKey)
      {
        let langTitle = gLanguageTitles.hasOwnProperty(aKey) ?
                        gLanguageTitles[aKey] : "[" + aKey + "]";
        gActiveLanguages.appendItem(langTitle, aKey);
      }
    }
  );

  SelectLanguage();

  return;
}

// Checks whether listitems and pref values matches, returns false if not.
function InSync(aPrefArray)
{
  // Can't match if they don't have the same length.
  if (aPrefArray.length != gLanguages.length)
    return false;

  return aPrefArray.every(
    function(aElement, aIndex)
    {
      return aElement == gLanguages[aIndex].value;
    }
  );
}

// Called on onsynctopreference.
function WriteActiveLanguages()
{
  return Array.from(gLanguages, e => e.value).join(",");
}

function MoveUp()
{
  var selected = gActiveLanguages.selectedItem;
  var before = selected.previousSibling;
  if (before)
  {
    before.parentNode.insertBefore(selected, before);
    gActiveLanguages.selectItem(selected);
    gActiveLanguages.ensureElementIsVisible(selected);
  }

  SelectLanguage();
  gActiveLanguages.doCommand();
}

function MoveDown()
{
  var selected = gActiveLanguages.selectedItem;
  if (selected.nextSibling)
  {
    var before = selected.nextSibling.nextSibling;
    gActiveLanguages.insertBefore(selected, before);
    gActiveLanguages.selectItem(selected);
  }

  SelectLanguage();
  gActiveLanguages.doCommand();
}

function RemoveActiveLanguage(aEvent)
{
  if (aEvent && aEvent.keyCode != aEvent.DOM_VK_DELETE &&
      aEvent.keyCode != aEvent.DOM_VK_BACK_SPACE)
    return;

  var nextNode = null;

  while (gActiveLanguages.selectedItem)
  {
    var selectedNode = gActiveLanguages.selectedItem;
    nextNode = selectedNode.nextSibling || selectedNode.previousSibling;
    selectedNode.remove();
  }

  if (nextNode)
    gActiveLanguages.selectItem(nextNode);

  SelectLanguage();
  gActiveLanguages.doCommand();
}

function SelectLanguage()
{
  var len = gActiveLanguages.selectedItems.length;
  EnableElementById("langRemove", len, false);
  var selected = gActiveLanguages.selectedItem;
  EnableElementById("langDown", (len == 1) && selected.nextSibling, false);
  EnableElementById("langUp", (len == 1) && selected.previousSibling, false);
}