// 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 gContentPane = {

  /**
   * Initializes the fonts dropdowns displayed in this pane.
   */
  init: function ()
  {
    this._rebuildFonts();
    var menulist = document.getElementById("defaultFont");
    if (menulist.selectedIndex == -1) {
      menulist.insertItemAt(0, "", "", "");
      menulist.selectedIndex = 0;
    }
  },

  // UTILITY FUNCTIONS

  /**
   * Utility function to enable/disable the button specified by aButtonID based
   * on the value of the Boolean preference specified by aPreferenceID.
   */
  updateButtons: function (aButtonID, aPreferenceID)
  {
    var button = document.getElementById(aButtonID);
    var preference = document.getElementById(aPreferenceID);
    button.disabled = preference.value != true;
    return undefined;
  },

  /**
   * Utility function to enable/disable the checkboxes for MSE options depending
   * on the value of media.mediasource.enabled.
   */
  updateMSE: function ()
  {
    var checkboxMSEMP4 = document.getElementById('videoMSEMP4');
    var checkboxMSEWebM = document.getElementById('videoMSEWebM');
    var preference = document.getElementById('media.mediasource.enabled');
    checkboxMSEMP4.disabled = preference.value != true;
    checkboxMSEWebM.disabled = preference.value != true;
  },

  // BEGIN UI CODE

  /*
   * Preferences:
   *
   * dom.disable_open_during_load
   * - true if popups are blocked by default, false otherwise
   */

  // POP-UPS

  /**
   * Displays the popup exceptions dialog where specific site popup preferences
   * can be set.
   */
  showPopupExceptions: function ()
  {
    var bundlePreferences = document.getElementById("bundlePreferences");
    var params = { blockVisible: false, sessionVisible: false, allowVisible: true, prefilledHost: "", permissionType: "popup" };
    params.windowTitle = bundlePreferences.getString("popuppermissionstitle");
    params.introText = bundlePreferences.getString("popuppermissionstext");
    document.documentElement.openWindow("Browser:Permissions",
                                        "chrome://browser/content/preferences/permissions.xul",
                                        "", params);
  },


  // FONTS

  /**
   * Populates the default font list in UI.
   */
  _rebuildFonts: function ()
  {
    var langGroupPref = document.getElementById("font.language.group");
    this._selectDefaultLanguageGroup(langGroupPref.value,
                                     this._readDefaultFontTypeForLanguage(langGroupPref.value) == "serif");
  },

  /**
   * 
   */
  _selectDefaultLanguageGroup: function (aLanguageGroup, aIsSerif)
  {
    const kFontNameFmtSerif         = "font.name.serif.%LANG%";
    const kFontNameFmtSansSerif     = "font.name.sans-serif.%LANG%";
    const kFontNameListFmtSerif     = "font.name-list.serif.%LANG%";
    const kFontNameListFmtSansSerif = "font.name-list.sans-serif.%LANG%";
    const kFontSizeFmtVariable      = "font.size.variable.%LANG%";

    var prefs = [{ format   : aIsSerif ? kFontNameFmtSerif : kFontNameFmtSansSerif,
                   type     : "fontname",
                   element  : "defaultFont",
                   fonttype : aIsSerif ? "serif" : "sans-serif" },
                 { format   : aIsSerif ? kFontNameListFmtSerif : kFontNameListFmtSansSerif,
                   type     : "unichar",
                   element  : null,
                   fonttype : aIsSerif ? "serif" : "sans-serif" },
                 { format   : kFontSizeFmtVariable,
                   type     : "int",
                   element  : "defaultFontSize",
                   fonttype : null }];
    var preferences = document.getElementById("contentPreferences");
    for (var i = 0; i < prefs.length; ++i) {
      var preference = document.getElementById(prefs[i].format.replace(/%LANG%/, aLanguageGroup));
      if (!preference) {
        preference = document.createElement("preference");
        var name = prefs[i].format.replace(/%LANG%/, aLanguageGroup);
        preference.id = name;
        preference.setAttribute("name", name);
        preference.setAttribute("type", prefs[i].type);
        preferences.appendChild(preference);
      }

      if (!prefs[i].element)
        continue;

      var element = document.getElementById(prefs[i].element);
      if (element) {
        element.setAttribute("preference", preference.id);

        if (prefs[i].fonttype)
          FontBuilder.buildFontList(aLanguageGroup, prefs[i].fonttype, element);

        preference.setElementValue(element);
      }
    }
  },

  /**
   * Returns the type of the current default font for the language denoted by
   * aLanguageGroup.
   */
  _readDefaultFontTypeForLanguage: function (aLanguageGroup)
  {
    const kDefaultFontType = "font.default.%LANG%";
    var defaultFontTypePref = kDefaultFontType.replace(/%LANG%/, aLanguageGroup);
    var preference = document.getElementById(defaultFontTypePref);
    if (!preference) {
      preference = document.createElement("preference");
      preference.id = defaultFontTypePref;
      preference.setAttribute("name", defaultFontTypePref);
      preference.setAttribute("type", "string");
      preference.setAttribute("onchange", "gContentPane._rebuildFonts();");
      document.getElementById("contentPreferences").appendChild(preference);
    }
    return preference.value;
  },

  /**
   * Displays the fonts dialog, where web page font names and sizes can be
   * configured.
   */  
  configureFonts: function ()
  {
    document.documentElement.openSubDialog("chrome://browser/content/preferences/fonts.xul",
                                           "", null);
  },

  /**
   * Displays the colors dialog, where default web page/link/etc. colors can be
   * configured.
   */
  configureColors: function ()
  {
    document.documentElement.openSubDialog("chrome://browser/content/preferences/colors.xul",
                                           "", null);  
  },

  // LANGUAGES

  /**
   * Shows a dialog in which the preferred language for web content may be set.
   */
  showLanguages: function ()
  {
    document.documentElement.openSubDialog("chrome://browser/content/preferences/languages.xul",
                                           "", null);
  }
};