var gPluginTypes = null;
var gPluginTypesList = null;

var gPrefs = null;

const kDisabledPluginTypesPref = "browser.download.pluginOverrideTypes";
const kPluginHandlerContractID = "@mozilla.org/content/plugin/document-loader-factory;1";

function init()
{
  gPrefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
  
  gPluginTypes = new PluginTypes();

  // Initialize the File Type list
  gPluginTypesList = document.getElementById("pluginTypesList");
  gPluginTypesList.treeBoxObject.view = gPluginTypes;
  
  var x = document.documentElement.getAttribute("screenX");
  if (x == "")
    setTimeout("centerOverParent()", 0);  
}

// This should actually go into some sort of pref fe utilities file. 
function centerOverParent()
{
  var parent = window.opener;
  
  x = parent.screenX + (parent.outerWidth / 2) - (window.outerWidth / 2);
  y = parent.screenY + (parent.outerHeight / 2) - (window.outerHeight / 2);
  window.moveTo(x, y);
}

function onAccept()
{
  var catman = Components.classes["@mozilla.org/categorymanager;1"].getService(Components.interfaces.nsICategoryManager);

  // Update the disabled plugin types pref and the category manager.
  var disabled = "";
  for (var i = 0; i < gPluginTypes._pluginTypes.length; ++i) {
    var currType = gPluginTypes._pluginTypes[i];

    if (!currType.pluginEnabled) {
      for (var j = 0; j < currType.MIMETypes.length; ++j) {
        disabled += currType.MIMETypes[j] + ",";
        catman.deleteCategoryEntry("Gecko-Content-Viewers", currType.MIMETypes[j], false);
      }
    }
    else {
      // We could have re-activated a deactivated Plugin handler, add all the handlers back again, 
      // replacing the existing ones. 
      for (j = 0; j < currType.MIMETypes.length; ++j)
        catman.addCategoryEntry("Gecko-Content-Viewers", currType.MIMETypes[j], 
                                kPluginHandlerContractID, false, true);
    }
  }
  
  if (disabled != "") {  
    disabled = disabled.substr(0, disabled.length - 1);
    
    gPrefs.setCharPref(kDisabledPluginTypesPref, disabled);
  }
  else if (gPrefs.prefHasUserValue(kDisabledPluginTypesPref)) {
    // Clear the pref if we've restored plugin functionality to all
    // listed types. 
    gPrefs.clearUserPref(kDisabledPluginTypesPref); 
  }
}

function PluginType (aPluginEnabled, aMIMEInfo) 
{
  this.pluginEnabled = aPluginEnabled;
  this.MIMEInfo = aMIMEInfo;
  this.MIMETypes = [this.MIMEInfo.MIMEType];
}

function PluginTypes()
{
  var atomSvc = Components.classes["@mozilla.org/atom-service;1"].getService(Components.interfaces.nsIAtomService);
  this._enabledAtom = atomSvc.getAtom("enabled");

  this._pluginTypes = [];
  this._pluginTypeHash = { };

  // Read enabled plugin type information from the category manager
  var catman = Components.classes["@mozilla.org/categorymanager;1"].getService(Components.interfaces.nsICategoryManager);
  var types = catman.enumerateCategory("Gecko-Content-Viewers");
  while (types.hasMoreElements()) {
    var currType = types.getNext().QueryInterface(Components.interfaces.nsISupportsCString).data;
    var contractid = catman.getCategoryEntry("Gecko-Content-Viewers", currType);
    if (contractid == kPluginHandlerContractID)
      this.addType(currType, true);
  }
  
  // Read disabled plugin type information from preferences
  try {
    var types = gPrefs.getCharPref(kDisabledPluginTypesPref);
    var disabledTypes = types.split(",");
    
    for (var i = 0; i < disabledTypes.length; ++i)
      this.addType(disabledTypes[i], false);
  }
  catch (e) { }
  
  this._pluginTypes.sort(this.sortCallback);
}

PluginTypes.prototype = {
  addType: function (aMIMEType, aPluginEnabled)
  {
    var mimeInfo = this.getMIMEInfoForType(aMIMEType);
    if (mimeInfo) {
      // We only want to show one entry per extension, even if several MIME
      // types map to that extension, e.g. audio/wav, audio/x-wav. Hash the
      // primary extension for the type to prevent duplicates. If we encounter
      // a duplicate, record the additional MIME type so we know to deactivate
      // support for it too if the user deactivates support for the extension.
      if (!(mimeInfo.primaryExtension in this._pluginTypeHash)) {
        var pluginType = new PluginType(aPluginEnabled, mimeInfo);
        this._pluginTypeHash[mimeInfo.primaryExtension] = pluginType;
        this._pluginTypes.push(pluginType);
      }        
      else {
        // Append this MIME type to the list of MIME types for the extension. 
        var pluginType = this._pluginTypeHash[mimeInfo.primaryExtension];
        pluginType.MIMETypes.push(mimeInfo.MIMEType);
      }
    }
  },

  sortCallback: function (a, b)
  {
    var ac = a.MIMEInfo.primaryExtension.toLowerCase();
    var bc = b.MIMEInfo.primaryExtension.toLowerCase();
    if (ac < bc) 
      return -1;
    else if (ac > bc) 
      return 1;
    return 0;
  },
#if 0
  sortAscending: true,
  sortCallback: function (a, b)
  {
    var ac = gPluginTypes.getSortProperty(a);
    var bc = gPluginTypes.getSortProperty(b);
    
    if (ac < bc) 
      return gPluginTypes.sortAscending ? -1 : 1;
    else if (ac > bc) 
      return gPluginTypes.sortAscending ? 1 : -1;
    return 0;
  },
  
  sortProperty: "fileExtension",
  getSortProperty: function (aObject)
  {
    switch (sortProperty) {
    case "fileExtension":
      return aObject.MIMEInfo.primaryExtension.toLowerCase();
    case "fileType":
      var desc = aObject.MIMEInfo.Description;
      // XXXben localize
      return desc || aObject.MIMEInfo.primaryExtension.toUpperCase() + " file";
    case "pluginEnabled":
      return aObject.pluginEnabled;
    }
    return null;
  },
#endif

  getMIMEInfoForType: function (aType)
  {
    try {
      var mimeSvc = Components.classes["@mozilla.org/mime;1"].getService(Components.interfaces.nsIMIMEService);
      return mimeSvc.GetFromTypeAndExtension(aType, "");
    }
    catch (e) { }
    
    return null;
  },

  // nsITreeView
  get rowCount() 
  { 
    return this._pluginTypes.length; 
  },

  getCellProperties: function (aRow, aCol, aProperties) 
  { 
    if (aCol == "pluginEnabled") {
      if (this._pluginTypes[aRow].pluginEnabled) 
        aProperties.AppendElement(this._enabledAtom);
    }
  },
  
  getImageSrc: function (aRow, aCol) 
  { 
    if (aCol == "fileExtension") 
      return "moz-icon://goat." + this._pluginTypes[aRow].MIMEInfo.primaryExtension + "?size=16";
    
    return null;
  },
  
  getCellText: function (aRow, aCol) 
  { 
    var mimeInfo = this._pluginTypes[aRow].MIMEInfo;
    
    if (aCol == "fileType") {
      var desc = mimeInfo.Description;
      // XXXben localize
      return desc || mimeInfo.primaryExtension.toUpperCase() + " file";
    }
    else if (aCol == "fileExtension")
      return mimeInfo.primaryExtension.toUpperCase();

    return "";    
  },
  
  cycleCell: function (aRow, aCol) 
  { 
    if (aCol == "pluginEnabled") {
      this._pluginTypes[aRow].pluginEnabled = !this._pluginTypes[aRow].pluginEnabled;
      gPluginTypesList.treeBoxObject.invalidateCell(aRow, aCol);
    }
  },

  selection: null,
  
  // Stuff we don't need...
  isContainer: function (aRow) { return false; },
  isContainerOpen: function (aRow) { return false; },
  isContainerEmpty: function (aRow) { return true; },
  isSeparator: function (aRow) { return false; },
  isSorted: function () { return false; },
  canDropOn: function (aRow) { return false; },
  canDropBeforeAfter: function (aRow, aBefore) { return false; },
  drop: function (aRow, aOrientation) { },
  getParentIndex: function (aRow) { },
  hasNextSibling: function (aRow, aNextIndex) { },
  getLevel: function (aRow) { },
  getProgressMode: function (aRow, aCol) { },
  getCellValue: function (aRow, aCol) { },
  setTree: function (aTree) { },
  toggleOpenState: function (aRow) { },
  cycleHeader: function (aCol, aColElt) { },
  selectionChanged: function () { },
  isEditable: function (aRow, aCol) { },
  setCellText: function (aRow, aCol, aValue) { },
  performAction: function (aAction) { },
  performActionOnRow: function (aAction, aRow) { },
  performActionOnCell: function (aAction, aRow, aCol) { },
  getRowProperties: function (aRow, aProperties) { },
  getColumnProperties: function (aCol, aColElt, aProperties) { }

};