(function($) {
	$.entwine('ss', function($){
		/**
		 * On resize of any close the open treedropdownfields
		 * as we'll need to redo with widths
		 */
		var windowWidth, windowHeight;
		$(window).bind('resize.treedropdownfield', function() {
			// Entwine's 'fromWindow::onresize' does not trigger on IE8. Use synthetic event.
			var cb = function() {$('.TreeDropdownField').closePanel();};

			// Workaround to avoid IE8 infinite loops when elements are resized as a result of this event 
			if($.browser.msie && parseInt($.browser.version, 10) < 9) {
				var newWindowWidth = $(window).width(), newWindowHeight = $(window).height();
				if(newWindowWidth != windowWidth || newWindowHeight != windowHeight) {
					windowWidth = newWindowWidth;
					windowHeight = newWindowHeight;
					cb();
				}
			} else {
				cb();
			}
		});
		
		var strings = {
			'openlink': ss.i18n._t('TreeDropdownField.OpenLink'),
			'fieldTitle': '(' + ss.i18n._t('TreeDropdownField.FieldTitle') + ')',
			'searchFieldTitle': '(' + ss.i18n._t('TreeDropdownField.SearchFieldTitle') + ')'
		};

		var _clickTestFn = function(e) {
			// If the click target is not a child of the current field, close the panel automatically.
			if(!$(e.target).parents('.TreeDropdownField').length) $('.TreeDropdownField').closePanel();
		};

		/**
		 * @todo Error display
		 * @todo No results display for search
		 * @todo Automatic expansion of ajax children when multiselect is triggered
		 * @todo Automatic panel positioning based on available space (top/bottom)
		 * @todo forceValue
		 * @todo Automatic width
		 * @todo Expand title height to fit all elements
		 */
		$('.TreeDropdownField').entwine({

			// XMLHttpRequest
			CurrentXhr: null,

			onadd: function() {
				this.append(
					'<span class="treedropdownfield-title"></span>' +
					'<div class="treedropdownfield-toggle-panel-link"><a href="#" class="ui-icon ui-icon-triangle-1-s"></a></div>' +
					'<div class="treedropdownfield-panel"><div class="tree-holder"></div></div>'
				);
			
				var linkTitle = strings.openLink;
				if(linkTitle) this.find("treedropdownfield-toggle-panel-link a").attr('title', linkTitle);
				if(this.data('title')) this.setTitle(this.data('title'));
				
				this.getPanel().hide();
				this._super();
			},
			getPanel: function() {
				return this.find('.treedropdownfield-panel');
			},
			openPanel: function() {
				// close all other panels
				$('.TreeDropdownField').closePanel();

				// Listen for clicks outside of the field to auto-close it
				$('body').bind('click', _clickTestFn);
				
				var panel = this.getPanel(), tree = this.find('.tree-holder');

				panel.css('width', this.width());
				
				panel.show();
				
				// swap the down arrow with an up arrow
				var toggle = this.find(".treedropdownfield-toggle-panel-link");
				toggle.addClass('treedropdownfield-open-tree');
				this.addClass("treedropdownfield-open-tree");
				
				toggle.find("a")
					.removeClass('ui-icon-triangle-1-s')
					.addClass('ui-icon-triangle-1-n');
				
				if(tree.is(':empty') && !panel.hasClass('loading')) {
					this.loadTree(null, this._riseUp);
				} else {
					this._riseUp();
				}

				this.trigger('panelshow');
			},
			_riseUp: function() {
				var container = this,
					dropdown = this.getPanel(),
					toggle = this.find(".treedropdownfield-toggle-panel-link"),
					offsetTop = toggle.innerHeight(),
					elHeight,
					elPos,
					endOfWindow;

				if (toggle.length > 0) {
					endOfWindow = ($(window).height() + $(document).scrollTop()) - toggle.innerHeight();
					elPos = toggle.offset().top;
					elHeight = dropdown.innerHeight();
					
					// If the dropdown is too close to the bottom of the page, position it above the 'trigger'
					if (elPos + elHeight > endOfWindow && elPos - elHeight > 0) {
						container.addClass('treedropdownfield-with-rise');
						offsetTop = -dropdown.outerHeight();
					} else {
						container.removeClass('treedropdownfield-with-rise');
					}
				}
				dropdown.css({"top": offsetTop + "px"});
			},
			closePanel: function() {
				jQuery('body').unbind('click', _clickTestFn);

				// swap the up arrow with a down arrow
				var toggle = this.find(".treedropdownfield-toggle-panel-link");
				toggle.removeClass('treedropdownfield-open-tree');
				this.removeClass('treedropdownfield-open-tree treedropdownfield-with-rise');
								
				toggle.find("a")
					.removeClass('ui-icon-triangle-1-n')
					.addClass('ui-icon-triangle-1-s');
					

				this.getPanel().hide();
				this.trigger('panelhide');
			},
			togglePanel: function() {
				this[this.getPanel().is(':visible') ? 'closePanel' : 'openPanel']();
			},
			setTitle: function(title) {
				title = title || this.data('empty-title') || strings.fieldTitle;
				
				this.find('.treedropdownfield-title').html(title);
				this.data('title', title); // separate view from storage (important for search cancellation)
			},
			getTitle: function() {
				return this.find('.treedropdownfield-title').text();
			},
			/**
			 * Update title from tree node value
			 */
			updateTitle: function() {
				var self = this, tree = self.find('.tree-holder'), val = this.getValue();
				var updateFn = function() {
					var val = self.getValue();
					if(val) {

						var node = tree.find('*[data-id="' + val + '"]'),
							title = node.children('a').find("span.jstree_pageicon")?node.children('a').find("span.item").html():null;
						if(!title) title=(node.length > 0) ? tree.jstree('get_text', node[0]) : null;

						if(title) {
							self.setTitle(title);
							self.data('title', title);
						}
						if(node) tree.jstree('select_node', node);
					}
					else {
						self.setTitle(self.data('empty-title'));
						self.removeData('title');
					}
				};

				// Load the tree if its not already present
				if(!tree.is(':empty') || !val) updateFn();
				else this.loadTree({forceValue: val}, updateFn);
			},
			setValue: function(val) {
				this.data('metadata', $.extend(this.data('metadata'), {id: val}));
				this.find(':input:hidden').val(val)
					// Trigger synthetic event so subscribers can workaround the IE8 problem with 'change' events
					// not propagating on hidden inputs. 'change' is still triggered for backwards compatiblity.
					.trigger('valueupdated')
					.trigger('change');
			},
			getValue: function() {
				return this.find(':input:hidden').val();
			},
			loadTree: function(params, callback) {
				var self = this, panel = this.getPanel(), treeHolder = $(panel).find('.tree-holder'),
					params = (params) ? $.extend({}, this.getRequestParams(), params) : this.getRequestParams(), xhr;

				if(this.getCurrentXhr()) this.getCurrentXhr().abort();
				panel.addClass('loading');
				xhr = $.ajax({
					url: this.data('urlTree'),
					data: params,
					complete: function(xhr, status) {
						panel.removeClass('loading');
					},
					success: function(html, status, xhr) {
						treeHolder.html(html);
						var firstLoad = true;
						treeHolder
							.jstree('destroy')
							.bind('loaded.jstree', function(e, data) {
								var val = self.getValue(), selectNode = treeHolder.find('*[data-id="' + val + '"]'), 
									currentNode = data.inst.get_selected();
								if(val && selectNode != currentNode) data.inst.select_node(selectNode);
								firstLoad = false;
								if(callback) callback.apply(self);
							})
							.jstree(self.getTreeConfig())
							.bind('select_node.jstree', function(e, data) {
								var node = data.rslt.obj, id = $(node).data('id');
								if(!firstLoad && self.getValue() == id) {
									// Value is already selected, unselect it (for lack of a better UI to do this)
									self.data('metadata', null);
									self.setTitle(null);
									self.setValue(null);
									data.inst.deselect_node(node);
								} else {
									self.data('metadata', $.extend({id: id}, $(node).getMetaData()));
									self.setTitle(data.inst.get_text(node));
									self.setValue(id);
								}
								
								// Avoid auto-closing panel on first load
								if(!firstLoad) self.closePanel();
								firstLoad=false;
							});

						self.setCurrentXhr(null);
					}
				});
				this.setCurrentXhr(xhr);
			},
			getTreeConfig: function() {
				var self = this;
				return {
					'core': {
						'html_titles': true,
						// 'initially_open': ['record-0'],
						'animation': 0
					},
					'html_data': {
						// TODO Hack to avoid ajax load on init, see http://code.google.com/p/jstree/issues/detail?id=911
						'data': this.getPanel().find('.tree-holder').html(),
						'ajax': {
							'url': function(node) {
								var url = $.path.parseUrl(self.data('urlTree')).hrefNoSearch;
								return url + '/' + ($(node).data("id") ? $(node).data("id") : 0);
							},
							'data': function(node) {
								var query = $.query.load(self.data('urlTree')).keys;
								var params = self.getRequestParams();
								params = $.extend({}, query, params, {ajax: 1});
								return params;
							}
						}
					},
					'ui': {
						"select_limit" : 1,
						'initially_select': [this.getPanel().find('.current').attr('id')]
					},
					'themes': {
						'theme': 'apple'
					},
					'types' : {
						'types' : {
							'default': {
								'check_node': function(node) {
									return ( ! node.hasClass('disabled'));
								},
								'uncheck_node': function(node) {
									return ( ! node.hasClass('disabled'));
								},
								'select_node': function(node) {
									return ( ! node.hasClass('disabled'));
								},
								'deselect_node': function(node) {
									return ( ! node.hasClass('disabled'));
								}
							}
						}
					},
					'plugins': ['html_data', 'ui', 'themes', 'types']
				};
			},
			/**
			 * If the field is contained in a form, submit all form parameters by default.
			 * This is useful to keep state like locale values which are typically
			 * encoded in hidden fields through the form.
			 * 
			 * @return {object}
			 */
			getRequestParams: function() {
				return {};
			}
		});
		
		$('.TreeDropdownField .tree-holder li').entwine({
			/**
			 * Overload to return more data. The same data should be set on initial
			 * value through PHP as well (see TreeDropdownField->Field()).
			 * 
			 * @return {object}
			 */
			getMetaData: function() {
				var matches = this.attr('class').match(/class-([^\s]*)/i);
				var klass = matches ? matches[1] : '';
				return {ClassName: klass};
			}
		});
		
		$('.TreeDropdownField *').entwine({
			getField: function() {
				return this.parents('.TreeDropdownField:first');
			}
		});
		
		$('.TreeDropdownField').entwine({
			onclick: function(e) {
				this.togglePanel();
					
				return false;
			}
		});
	
		$('.TreeDropdownField .treedropdownfield-panel').entwine({
			onclick: function(e) {
				return false;
			}
		});
		
		$('.TreeDropdownField.searchable').entwine({
			onadd: function() {
				this._super();
				var title = ss.i18n._t('TreeDropdownField.ENTERTOSEARCH');
				this.find('.treedropdownfield-panel').prepend(
					$('<input type="text" class="search treedropdownfield-search" data-skip-autofocus="true" placeholder="' + title + '" value="" />')
				);
			},
			search: function(str, callback) {
				this.openPanel();
				this.loadTree({search: str}, callback);
			},
			cancelSearch: function() {
				this.closePanel();
				this.loadTree();
			}
		});
		
		$('.TreeDropdownField.searchable input.search').entwine({
			onkeydown: function(e) {
				var field = this.getField();
				if(e.keyCode == 13) {
					// trigger search on ENTER key
					field.search(this.val());
					return false;
				} else if(e.keyCode == 27) {
					// cancel search on ESC key
					field.cancelSearch();
				}
			}
		});
		
		$('.TreeDropdownField.multiple').entwine({
			getTreeConfig: function() {
				var cfg = this._super();
				cfg.checkbox = {override_ui: true, two_state: true};
				cfg.plugins.push('checkbox');
				cfg.ui.select_limit = -1;
				return cfg;
			},
			loadTree: function(params, callback) {
				var self = this, panel = this.getPanel(), treeHolder = $(panel).find('.tree-holder');
				var params = (params) ? $.extend({}, this.getRequestParams(), params) : this.getRequestParams(), xhr;

				if(this.getCurrentXhr()) this.getCurrentXhr().abort();
				panel.addClass('loading');
				xhr = $.ajax({
					url: this.data('urlTree'),
					data: params,
					complete: function(xhr, status) {
						panel.removeClass('loading');
					},
					success: function(html, status, xhr) {
						treeHolder.html(html);
						var firstLoad = true;
						self.setCurrentXhr(null);
						treeHolder
							.jstree('destroy')
							.bind('loaded.jstree', function(e, data) {
								$.each(self.getValue(), function(i, val) {
									data.inst.check_node(treeHolder.find('*[data-id=' + val + ']'));
								});
								firstLoad = false;
								if(callback) callback.apply(self);
							})
							.jstree(self.getTreeConfig())
							.bind('uncheck_node.jstree check_node.jstree', function(e, data) {
								var nodes = data.inst.get_checked(null, true);
								self.setValue($.map(nodes, function(el, i) {
									return $(el).data('id');
								}));
								self.setTitle($.map(nodes, function(el, i) {
									return data.inst.get_text(el);
								}));
								self.data('metadata', $.map(nodes, function(el, i) {
									return {id: $(el).data('id'), metadata: $(el).getMetaData()};
								}));
							});
					}
				});
				this.setCurrentXhr(xhr);
			},
			getValue: function() {
				var val = this._super();
				return val.split(/ *, */);
			},
			setValue: function(val) {
				this._super($.isArray(val) ? val.join(',') : val);
			},
			setTitle: function(title) {
				this._super($.isArray(title) ? title.join(', ') : title);
			},
			updateTitle: function() {
				// TODO Not supported due to multiple values/titles yet
			}
		});

		$('.TreeDropdownField input[type=hidden]').entwine({
			onadd: function() {
				this._super();
				this.bind('change.TreeDropdownField', function() {
					$(this).getField().updateTitle();
				});
			},
			onremove: function() {
				this._super();
				this.unbind('.TreeDropdownField');
			}
		});
	});
}(jQuery));