if(jQuery) (function($){
	$.extend($.fn, {
		violetTree : function (o) {
			if( !o ) var o = {};
			if( o.data == undefined ) o.data = null;
			if( o.rootName == undefined ) o.rootName = 'Thư mục gốc';
			
			if( o.draggable == undefined ) o.draggable = false;
			
			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.manager ==  undefined) o.manager = null;
			
			var treeNodes = [];
			var oContainer = this;
			var selectedNode = null;
			var documentBoundEvent = false;
			
			var createNode = function (node) {
				if( !node ) var node = {};
				if( node.item == undefined ) node.item = null; //item.id, item.name, item.parentID
				if( node.isRoot == undefined ) node.isRoot = false;
				if( node.defaultStatus == undefined ) node.defaultStatus = 0; //0: collapsed; 1:expanded;
				if( node.showContextMenu == undefined ) node.showContextMenu = true; //0: collapsed; 1:expanded;
				
				var parentNode = node.isRoot == true ? oContainer : $(oContainer).find('UL.vstree > LI[rel="folder"] > A#' + node.item.parentID);
				var nodeClass = node.isRoot == true ? 'home':'directory';
				var hidden = (node.isRoot == true || node.item.parentID == 0 ) ? null:'display:none';
				var defaulState = (node.isRoot == false && node.defaultStatus == 1 ) ? 'expanded' : 'collapsed';
				
				var a = $('<a></a>',{id: node.item.id,href: '#',rel: node.item.name,text: node.item.name});
				var li = $('<li></li>',{'class': nodeClass,rel: 'folder'}).append(a);			
				var ul = $('<ul></ul>',{'class':'vstree',style:hidden}).append(li);
				$(li).addClass(defaulState);
				
				bindNodeEvents(a);
				
				treeNodes[node.item.id] = {id:node.item.id, name:node.item.name, parentID:node.item.parentID, html:ul, status:defaulState, isRoot:node.isRoot};

				if (node.isRoot == false) $(parentNode).parent().append(ul); else $(parentNode).append(ul);
				return (parentNode.length == 1);
			};
			
			var bindNodeEvents = function (node) {
				if (node == null) return false;
								
				//click event
				$(node).bind("click", function (e){if(e.button == 0)nodeClick(this);return false;});
								
				//Press F2 to rename, ESC to cancel rename
				if (documentBoundEvent == false) {
					$(oContainer).bind('keydown','keypress', function(e) {
						switch( e.keyCode ) {
						case 113:
							renameInit(selectedNode);
							break;
						case 27:
							renameCancel(selectedNode);
							break;
						case 46:
							var dirID = $(selectedNode).attr('id');
							var dirObj = {};
							dirObj.id = treeNodes[dirID].id;
							dirObj.name = treeNodes[dirID].name;
							dirObj.parentID = treeNodes[dirID].parentID;
							dirObj.type = 'directory';
							if (e.keyCode == 46) o.manager.deleteItem([dirObj]);
							break;
						case 13:
						default:
							break;
					}
					});
					
					documentBoundEvent = true;
				}
				
				disabledItemsList = [];
				
				$(node).contextMenu({menu: 'treeMenu',disabledItems: disabledItemsList}, 
					function(action, el, pos) {
						var dirID = $(el).attr('id');
						var item = $(treeNodes[dirID].html).find('> LI > A#' + dirID);
						var dirObj = {};
						dirObj.id = treeNodes[dirID].id;
						dirObj.name = treeNodes[dirID].name;
						dirObj.parentID = treeNodes[dirID].parentID;
						dirObj.type = 'directory';
						
						switch(action) {
							case 'rename':
								renameInit(item);
								break;
							case 'newfolder':
								o.manager.createNewFolder();
								break;
							case 'share':
							case 'copy':
							case 'cut':
								break;
							case 'delete':
								o.manager.deleteItem([dirObj]);
								break;
							default:
								break;
						}
				});
				
			};
			
			var nodeClick = function (node) {
				var folderID = $(node).attr('id');
				selectedNode = hightlightNode(node);
				o.manager.setTreeCurrentNode(folderID);
				
				if (treeNodes[folderID].isRoot) {
					return;
				}
				if (treeNodes[folderID].status == 'collapsed') {
					expandNode(node);
					treeNodes[folderID].status = 'expanded';
				}
				else {
					collapNode(node);
					treeNodes[folderID].status = 'collapsed';
				}
			};
			
			var hightlightNode = function (node) {
				$(oContainer).find('.currentDir').removeClass('currentDir');
				$(node).addClass('currentDir');
				$(node).select();
				return node;
			}
			
			var expandNode = function (node) {
				var li = $(node).parent();
				$(li).find('> UL:hidden').slideDown({ duration: o.expandSpeed, easing: o.expandEasing });
				$(li).removeClass('collapsed').addClass('expanded');
			};
			
			var collapNode = function (node) {
				var li = $(node).parent();
				$(li).find('> UL').slideUp({ duration: o.expandSpeed, easing: o.expandEasing });
				$(li).removeClass('expanded').addClass('collapsed');
			};
			
			var initTree = function () {
				if (o.data == null) {
					console.error(o.data, 'No directory to display!');
					return;
				}
				$(oContainer).find ('.vstree').remove();
				var homeNode = createNode({
					item: {id:0, name:o.rootName, parentID:-1},
					isRoot: true
				});
				if (homeNode && o.data.length > 0) {
					for (var i = 0; i < o.data.length; i++) {
						createNode ({item: o.data[i]});
					}
				}
				o.manager.setTreeCurrentNode(0);
				
				$(oContainer).attr('unselectable','on')
			     .css({'-moz-user-select':'-moz-none',
			           '-moz-user-select':'none',
			           '-o-user-select':'none',
			           '-khtml-user-select':'none',
			           '-webkit-user-select':'none',
			           '-ms-user-select':'none',
			           'user-select':'none'
			     }).bind('selectstart', function(){ return false;}); 
			};
			
			/******************
			 * RENAME - START *
			 ******************/
			
			var renameInit = function (node) {
				var editor = $('<input>',{class:'rename', type: 'text', value:$(node).text()});
				$(editor).bind('focusout', function(e){renameCancel(node)});
				$(editor).bind('keypress', function(e){
						var keycode = (e.keyCode ? e.keyCode : e.which);
						if(keycode == '13') renameComplete(node);
						e.stopPropagation();
					});
				
				$(node).text('');
				$(node).append(editor);
				$(editor).focus();
				$(editor).select();
			}
			
			var renameCancel = function (node) {
				var dirID = $(node).attr('id');
				$(node).find('>INPUT').remove();
				$(node).text(treeNodes[dirID].name);
				$(node).select();
			}
			
			var renameComplete = function (node) {
				var editor = $(node).find('>INPUT');
				var dirID = $(node).attr('id');
				var newName = $(editor).val();
				$(node).attr('rel', newName);
				$(node).text(newName);
				$(node).find('>INPUT').remove();
				treeNodes[dirID].name = newName;
				updateData(dirID, 'rename');
			}
			
			/******************
			 * RENAME - END *
			 ******************/
			
			/******************
			 * DELTE - START *
			 ******************/
			var destroyNode = function (node) {
				var dirID = $(node).attr('id');
				$(node).parent().parent().remove();
				delete treeNodes[dirID];
			}
			/******************
			 * DELTE - END *
			 ******************/
			/*******************************
			 * COPY & PASTE & MOVE - START *
			 *******************************/
			var copyNode = function (source){

			}
			
			var pasteNode = function (destination) {
				
			}
			
			var moveNode = function (source, destination) {
				
			}
			/*****************************
			 * COPY & PASTE & MOVE - END *
			 *****************************/
			
			var updateData = function (id, act) {
				for (var i = 0; i < o.data.length; i++) {
					if (o.data[i].id == id) {
						if(act == 'deletion') {
							delete o.data[i];
						}
						else {
							o.data[i].name = treeNodes[id].name
							o.data[i].parentID = treeNodes[id].parentID;
						}
						break;
					}
				}
				
				o.manager.updateData({item:treeNodes[id], from:'tree', type:'directory', callback:act});
			}
			
			this.deletion = function (id) {
				destroyNode($(oContainer).find('A#'+id));
			}
			
			this.setData = function (data) {
				o.data = data;
			}
			
			this.getRoot = function () {
				return treeNodes[0];
			}

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