(function($) {
	$.extend($.fn, {
		swapClass: function(c1, c2) {
			var c1Elements = this.filter('.' + c1);
			this.filter('.' + c2).removeClass(c2).addClass(c1);
			c1Elements.removeClass(c1).addClass(c2);
			return this
		},
		replaceClass: function(c1, c2) {
			return this.filter('.' + c1).removeClass(c1).addClass(c2).end()
		},
		hoverClass: function(className) {
			className = className || "hover";
			return this.hover(function() {
				$(this).addClass(className)
			},
			function() {
				$(this).removeClass(className)
			})
		},
		heightToggle: function(animated, callback) {
			animated ? this.animate({
				height: "toggle"
			},
			animated, callback) : this.each(function() {
				jQuery(this)[jQuery(this).is(":hidden") ? "show": "hide"]();
				if (callback) callback.apply(this, arguments)
			})
		},
		heightHide: function(animated, callback) {
			if (animated) {
				this.animate({
					height: "hide"
				},
				animated, callback)
			} else {
				this.hide();
				if (callback) this.each(callback)
			}
		},
		prepareBranches: function(settings) {
			if (!settings.prerendered) {
				this.filter(":last-child:not(ul)").addClass(CLASSES.last);
				this.filter((settings.collapsed ? "": "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide()
			}
			return this.filter(":has(>ul)")
		},
		applyClasses: function(settings, toggler) {
			this.filter(":has(>ul):not(:has(>a))").find(">span").unbind("click.treeview").bind("click.treeview",
			function(event) {
				if (this == event.target) toggler.apply($(this).next())
			}).add($("a", this)).hoverClass();
			if (!settings.prerendered) {
				this.filter(":has(>ul:hidden)").addClass(CLASSES.expandable).replaceClass(CLASSES.last, CLASSES.lastExpandable);
				this.not(":has(>ul:hidden)").addClass(CLASSES.collapsable).replaceClass(CLASSES.last, CLASSES.lastCollapsable);
				var hitarea = this.find("div." + CLASSES.hitarea);
				if (!hitarea.length) hitarea = this.prepend("<div class=\"" + CLASSES.hitarea + "\"/>").find("div." + CLASSES.hitarea);
				hitarea.removeClass().addClass(CLASSES.hitarea).each(function() {
					var classes = "";
					$.each($(this).parent().attr("class").split(" "),
					function() {
						classes += this + "-hitarea "
					});
					$(this).addClass(classes)
				})
			}
			this.find("div." + CLASSES.hitarea).click(toggler)
		},
		treeview: function(settings) {
			settings = $.extend({
				cookieId: "treeview"
			},
			settings);
			if (settings.toggle) {
				var callback = settings.toggle;
				settings.toggle = function() {
					return callback.apply($(this).parent()[0], arguments)
				}
			}
			function treeController(tree, control) {
				function handler(filter) {
					return function() {
						toggler.apply($("div." + CLASSES.hitarea, tree).filter(function() {
							return filter ? $(this).parent("." + filter).length: true
						}));
						return false
					}
				}
				$("a:eq(0)", control).click(handler(CLASSES.collapsable));
				$("a:eq(1)", control).click(handler(CLASSES.expandable));
				$("a:eq(2)", control).click(handler())
			}
			function toggler() {
				$(this).parent().find(">.hitarea").swapClass(CLASSES.collapsableHitarea, CLASSES.expandableHitarea).swapClass(CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea).end().swapClass(CLASSES.collapsable, CLASSES.expandable).swapClass(CLASSES.lastCollapsable, CLASSES.lastExpandable).find(">ul").heightToggle(settings.animated, settings.toggle);
				if (settings.unique) {
					$(this).parent().siblings().find(">.hitarea").replaceClass(CLASSES.collapsableHitarea, CLASSES.expandableHitarea).replaceClass(CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea).end().replaceClass(CLASSES.collapsable, CLASSES.expandable).replaceClass(CLASSES.lastCollapsable, CLASSES.lastExpandable).find(">ul").heightHide(settings.animated, settings.toggle)
				}
			}
			this.data("toggler", toggler);
			function serialize() {
				function binary(arg) {
					return arg ? 1 : 0
				}
				var data = [];
				branches.each(function(i, e) {
					data[i] = $(e).is(":has(>ul:visible)") ? 1 : 0
				});
				$.cookie(settings.cookieId, data.join(""), settings.cookieOptions)
			}
			function deserialize() {
				var stored = $.cookie(settings.cookieId);
				if (stored) {
					var data = stored.split("");
					branches.each(function(i, e) {
						$(e).find(">ul")[parseInt(data[i]) ? "show": "hide"]()
					})
				}
			}
			this.addClass("treeview");
			var branches = this.find("li").prepareBranches(settings);
			switch (settings.persist) {
			case "cookie":
				var toggleCallback = settings.toggle;
				settings.toggle = function() {
					serialize();
					if (toggleCallback) {
						toggleCallback.apply(this, arguments)
					}
				};
				deserialize();
				break;
			case "location":
				var current = this.find("a").filter(function() {
					return this.href.toLowerCase() == location.href.toLowerCase()
				});
				if (current.length) {
					var items = current.addClass("selected").parents("ul, li").add(current.next()).show();
					if (settings.prerendered) {
						items.filter("li").swapClass(CLASSES.collapsable, CLASSES.expandable).swapClass(CLASSES.lastCollapsable, CLASSES.lastExpandable).find(">.hitarea").swapClass(CLASSES.collapsableHitarea, CLASSES.expandableHitarea).swapClass(CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea)
					}
				}
				break
			}
			branches.applyClasses(settings, toggler);
			if (settings.control) {
				treeController(this, settings.control);
				$(settings.control).show()
			}
			return this
		}
	});
	$.treeview = {};
	var CLASSES = ($.treeview.classes = {
		open: "open",
		closed: "closed",
		expandable: "expandable",
		expandableHitarea: "expandable-hitarea",
		lastExpandableHitarea: "lastExpandable-hitarea",
		collapsable: "collapsable",
		collapsableHitarea: "collapsable-hitarea",
		lastCollapsableHitarea: "lastCollapsable-hitarea",
		lastCollapsable: "lastCollapsable",
		lastExpandable: "lastExpandable",
		last: "last",
		hitarea: "hitarea"
	})
})(jQuery);