/**
 * @fileOverview 树控件
 * @author fei.hong <hf@yoho.cn>
 * @date 2012-11-09
 */
define('lib/ui/jquery.treeview', ["jquery"], function(require)
{
	var jQuery = require("jquery");
	
	/*
	 * Treeview 1.4 - jQuery plugin to hide and show branches of a tree
	 * 
	 * http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
	 * http://docs.jquery.com/Plugins/Treeview
	 *
	 * Copyright (c) 2007 Jörn Zaefferer
	 *
	 * Dual licensed under the MIT and GPL licenses:
	 *   http://www.opensource.org/licenses/mit-license.php
	 *   http://www.gnu.org/licenses/gpl.html
	 *
	 * Revision: $Id: jquery.treeview.js,v 1.1 2009/11/27 06:30:43 lihongyun Exp $
	 *
	 */
	;(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() {
					$(this).removeClass(className);
				});
			},
			heightToggle: function(animated, callback) {
				animated ?
					this.animate({ height: "toggle" }, animated, callback) :
					this.each(function(){
						jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]();
						if(callback)
							callback.apply(this, arguments);
					});
			},
			heightHide: function(animated, callback) {
				if (animated) {
					this.animate({ height: "hide" }, animated, callback);
				} else {
					this.hide();
					if (callback)
						this.each(callback);				
				}
			},
			prepareBranches: function(settings) {
				if (!settings.prerendered) {
					// mark last tree items
					this.filter(":last-child:not(ul)").addClass(CLASSES.last);
					// collapse whole tree, or only those marked as closed, anyway except those marked as open
					this.filter((settings.collapsed ? "" : "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide();
				}
				// return all items with sublists
				return this.filter(":has(>ul)");
			},
			applyClasses: function(settings, toggler) {
				this.filter(":has(>ul):not(:has(>a))").find(">span").click(function(event) {
					toggler.apply($(this).next());
				}).add( $("a", this) ).hoverClass();
				
				if (!settings.prerendered) {
					// handle closed ones first
					this.filter(":has(>ul:hidden)")
							.addClass(CLASSES.expandable)
							.replaceClass(CLASSES.last, CLASSES.lastExpandable);
							
					// handle open ones
					this.not(":has(>ul:hidden)")
							.addClass(CLASSES.collapsable)
							.replaceClass(CLASSES.last, CLASSES.lastCollapsable);
							
		            // create hitarea
					this.prepend("<div class=\"" + CLASSES.hitarea + "\"/>").find("div." + CLASSES.hitarea).each(function() {
						var classes = "";
						$.each($(this).parent().attr("class").split(" "), function() {
							classes += this + "-hitarea ";
						});
						$(this).addClass( classes );
					});
				}
				
				// apply event to hitarea
				this.find("div." + CLASSES.hitarea).click( toggler );
			},
			treeview: function(settings) {
				
				settings = $.extend({
					cookieId: "treeview"
				}, settings);
				
				if (settings.add) {
					return this.trigger("add", [settings.add]);
				}
				
				if ( settings.toggle ) {
					var callback = settings.toggle;
					settings.toggle = function() {
						return callback.apply($(this).parent()[0], arguments);
					};
				}
			
				// factory for treecontroller
				function treeController(tree, control) {
					// factory for click handlers
					function handler(filter) {
						return function() {
							// reuse toggle event handler, applying the elements to toggle
							// start searching for all hitareas
							toggler.apply( $("div." + CLASSES.hitarea, tree).filter(function() {
								// for plain toggle, no filter is provided, otherwise we need to check the parent element
								return filter ? $(this).parent("." + filter).length : true;
							}) );
							return false;
						};
					}
					// click on first element to collapse tree
					$("a:eq(0)", control).click( handler(CLASSES.collapsable) );
					// click on second to expand tree
					$("a:eq(1)", control).click( handler(CLASSES.expandable) );
					// click on third to toggle tree
					$("a:eq(2)", control).click( handler() ); 
				}
			
				// handle toggle event
				function toggler() {
					$(this)
						.parent()
						// swap classes for hitarea
						.find(">.hitarea")
							.swapClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
							.swapClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea )
						.end()
						// swap classes for parent li
						.swapClass( CLASSES.collapsable, CLASSES.expandable )
						.swapClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
						// find child lists
						.find( ">ul" )
						// toggle them
						.heightToggle( settings.animated, settings.toggle );
					if ( settings.unique ) {
						$(this).parent()
							.siblings()
							// swap classes for hitarea
							.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 );
					}
				}
				
				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("") );
				}
				
				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" ]();
						});
					}
				}
				
				// add treeview class to activate styles
				this.addClass("treeview");
				
				// prepare branches and find all tree items with child lists
				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 ) {
						current.addClass("selected").parents("ul, li").add( current.next() ).show();
					}
					break;
				}
				
				branches.applyClasses(settings, toggler);
					
				// if control option is set, create the treecontroller and show it
				if ( settings.control ) {
					treeController(this, settings.control);
					$(settings.control).show();
				}
				
				return this.bind("add", function(event, branches) {
					$(branches).prev()
						.removeClass(CLASSES.last)
						.removeClass(CLASSES.lastCollapsable)
						.removeClass(CLASSES.lastExpandable)
					.find(">.hitarea")
						.removeClass(CLASSES.lastCollapsableHitarea)
						.removeClass(CLASSES.lastExpandableHitarea);
					$(branches).find("li").andSelf().prepareBranches(settings).applyClasses(settings, toggler);
				});
			}
		});
		
		// classes used by the plugin
		// need to be styled via external stylesheet, see first example
		var CLASSES = $.fn.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"
		};
		
		// provide backwards compability
		$.fn.Treeview = $.fn.treeview;
		
	})(jQuery);
	
});