if(jQuery) (function($){
	
	$.extend($.fn, {
		violetTree: function(o) {
			if( !o ) var o = {};
			if( o.user == undefined ) o.user = null;
			if( o.homeDirNameDisplay == undefined ) o.homeDirNameDisplay = 'Home';
			if( o.host == undefined ) o.host = 'http://localhost/';
			if( o.script == undefined ) o.script = 'ajax/privatecontent/getcontent';
			if( o.container == undefined ) o.container = $(this);
			if( o.dirIDprefix == undefined ) o.dirIDprefix = 'vsdir_';

			if( o.expandSpeed == undefined ) o.expandSpeed= 500;
			if( o.collapseSpeed == undefined ) o.collapseSpeed= 500;
			if( o.expandEasing == undefined ) o.expandEasing = null;
			if( o.collapseEasing == undefined ) o.collapseEasing = null;

			if( o.directoryTreeData == undefined ) o.directoryTreeData = null;
			if( o.grid == undefined ) o.grid = null;
			
			// PRIVATE methods
			var sendCommand = function (p) {
				if( p.postdata == undefined ) p.postdata = null;
				if( p.script == undefined ) p.script = o.script;
				if( p.callbackSuccess == undefined ) p.callbackSuccess = null;
				if( p.callbackDone == undefined ) p.callbackDone = null;
				if( p.callbackFail == undefined ) p.callbackFail = null;
				if( p.callbackAlways == undefined ) p.callbackAlways = null;

				if (p.script != null) {
					$.post(o.host + p.script, p.postdata, function (data){
						if (data) {
							parseData = $.parseJSON(data);
						}

						if (p.callbackSuccess != null) {
							p.callbackSuccess(parseData);
						}

					}).done(function() {if (p.callbackDone != null)p.callbackDone(this);}).fail(function() {if (p.callbackFail != null)p.callbackFail(this);}).always(function() {if (p.callbackAlways != null)p.callbackAlways(this);});
				}
			}

			var loadTree = function () {
				sendCommand ({postdata:null,callbackSuccess:renderTree});
			};

			var renderTree = function  (parseData) {

				o.directoryTreeData = parseData;				
				var directoryData = parseData.DIRECTORIES;

				var homeNode = createNode({
					id:0,
					name:o.homeDirNameDisplay,
				});

				selectDir($(homeNode).find('> A'));
				if (directoryData != null) {
					for (var i = 0; i < directoryData.length ; i++) {
						var node = createNode ({
							id: directoryData[i].id,
							name: directoryData[i].name,
							curentNode: $('#' + o.dirIDprefix + directoryData[i].parentID).find('> A'),
							hidden: (directoryData[i].parentID > 0) ? true : false
						})
					};
				}
			};

			//Create a node of Tree
			var createNode = function (d) {
				if( !d ) var d = {};
				if( d.id == undefined ) d.id = null;
				if( d.name == undefined ) d.name = null;
				if( d.curentNode == undefined ) d.curentNode = null;
				if( d.hidden == undefined ) d.hidden = true;
				if( d.clickEvent == undefined ) d.clickEvent = openDir;
				if( d.customEvent == undefined ) d.customEvent = null; //customEvent.eventName, customEvent.eventTrigger
				if( d.addToJSONData == undefined ) d.addToJSONData = false;
				
				if (d.curentNode != null) {
					var strHTML = '<ul class="vstree"><li id="' + o.dirIDprefix + d.id + '" class="directory collapsed"><a href="#" rel="' + d.name + '">' + d.name + '</a></li></ul>';

					$(d.curentNode).parent().append(strHTML);
					if (d.hidden == true) 
						$('#' + o.dirIDprefix + d.id).parent().css('display','none');
					
				}else if (d.id == 0){
					var strHTML = '<ul class="vstree"><li id="' + o.dirIDprefix + d.id + '" class="home"><a href="#" rel="' + d.name + '">' + d.name + '</a></li></ul>';
					$(o.container).append(strHTML);
				}

				//bind new node to data
				if (d.addToJSONData == true) {
					//o.directoryTreeData.DIRECTORIES.length
					var newdir = {};
					newdir.id = d.id;
					newdir.name = d.name;
					newdir.parentID = $(d.curentNode).parent().attr('id').substring(o.dirIDprefix.length, $(d.curentNode).parent().attr('id').length);
					o.directoryTreeData.DIRECTORIES.push(newdir);
					sendtoGrid();
				}
				
				//bind event on new node
				$('#' + o.dirIDprefix + d.id).find('a').bind("click", function(e){d.clickEvent(this);return false;});
				
				$('#' + o.dirIDprefix + d.id).find('a').contextMenu({
					menu: 'treeMenu'
				}, function(action, el, pos) {
					alert(
						'Action: ' + action + '\n\n' +
						'Element text: ' + $(el).text() + '\n\n' + 
						'X: ' + pos.x + '  Y: ' + pos.y + ' (relative to element)\n\n' + 
						'X: ' + pos.docX + '  Y: ' + pos.docY+ ' (relative to document)'
						);
				});
				
				if (d.customEvent != null) 
					$('#' + o.dirIDprefix + d.id).find('a').bind(d.customEvent.eventName, function(e){d.customEvent.eventTrigger(this)});

				return $('#' + o.dirIDprefix + d.id);
			}
			//END - Create a node of Tree

			var deleteNode = function (parsedData) {
				if (parsedData.isSuccess == false) return false;
				if (!$('#' + o.dirIDprefix + parsedData.id).hasClass('home'))
					$('#' + o.dirIDprefix + parsedData.id).parent().remove();
			}

			var isHome = function (n) {
				return $(n).parent().hasClass('home');
			}

			var countNodeChild = function (n) {
				var parent = $(n).parent();
				return $(parent).find('UL').size();
			}

			var openDir = function (o) {
				if( $(o).parent().hasClass('collapsed') ) {
					$(o).parent().find('> UL:hidden').slideDown({ duration: o.expandSpeed, easing: o.expandEasing });
					$(o).parent().removeClass('collapsed').addClass('expanded');
				}
				else if( $(o).parent().hasClass('expanded') ) {
					$(o).parent().find('> UL').slideUp({ duration: o.collapseSpeed, easing: o.collapseEasing });
					$(o).parent().removeClass('expanded').addClass('collapsed');
				}
				selectDir(o);
			}

			var selectDir = function (c) {
				$('.currentDir').removeClass('currentDir');
				$(c).addClass('currentDir');
				sendtoGrid();
			}

			var sendtoGrid = function () {
				o.grid.getData({
								directoryTreeData: o.directoryTreeData,
								curentParent:$(o.container).find('.currentDir').parent().attr('id'),
								dirIDprefix: o.dirIDprefix
							});
			}

			loadTree();
			// END - PRIVATE methods


			this.expandAll = function() {
				$(o.container).find('UL:hidden').slideDown({ duration: o.expandSpeed, easing: o.expandEasing });
			};

			this.getCurrentDirName = function() {
				return $(o.container).find('.currentDir').attr('rel');
			};

			this.getCurrentDir = function() {
				return $(o.container).find('.currentDir');
			};

			this.createDir = function(c) {
				var cid = $(c).parent().attr('id');
				var pid = cid.substring(o.dirIDprefix.length, cid.length);

				var dirName = prompt("Please enter new directory name", "");
				var script = 'ajax/privatecontent/createdir';

				if (dirName != null && dirName.length != 0) {
					sendCommand({
						script: script,
						postdata:{parentID:pid,name:dirName},
						callbackSuccess: function (parsedData) {createNode({
											id: parsedData.id,
											name: parsedData.name,
											curentNode: c,
											hidden: false,
											addToJSONData:true});
										}
					});
				}
			}

			this.deleteDir = function (c) {
				var childExisted = (countNodeChild(c) > 0) ? true:false;
				var confirmDel = false;
				var confirmChild = true;

				var cid = $(c).parent().attr('id');
				var pid = cid.substring(o.dirIDprefix.length, cid.length);

				if (isHome(c)) return;

				confirmDel = confirm('Are you sure you want to delete this Directory?');

				if (childExisted > 0 && confirmDel)
					confirmChild = confirm('This node has childs, you still want to delete it?');

				if (confirmDel && confirmChild) {
					var postdata = {id:pid,delallchild:true}
					sendCommand({
						script:'ajax/privatecontent/deletedir',
						postdata:postdata,
						callbackSuccess: function (parsedData) {deleteNode(parsedData)}
					});
				}
			}

			this.copy = function () {
				alert ('copy');
			}

			this.paste = function () {
				alert ('paste');
			}

			this.initialize = function() {
        		return this;
    		};

			return this.initialize();
		}
	});

})(jQuery);