/*
  * Treeview pre-1.4.1 - 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: $Id$
  *
  */

 ;(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() {
 				$(this).removeClass(className);
 			});
 		},
 		heightToggle: function(animated, callback) {
 			animated ?
 				this.animate({ height: "toggle" }, animated, callback) :
 				this.each(function(){
 					jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]();
 					if(callback)
 						callback.apply(this, arguments);
 				});
 		},
 		heightHide: function(animated, callback) {
 			if (animated) {
 				this.animate({ height: "hide" }, animated, callback);
 			} else {
 				this.hide();
 				if (callback)
 					this.each(callback);				
 			}
 		},
 		prepareBranches: function(settings) {
 			if (!settings.prerendered) {
 				// mark last tree items
 				this.filter(":last-child:not(ul)").addClass(CLASSES.last);
 				// collapse whole tree, or only those marked as closed, anyway except those marked as open
 				this.filter((settings.collapsed ? "" : "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide();
 			}
 			// return all items with sublists
 			return this.filter(":has(>ul)");
 		},
 		applyClasses: function(settings, toggler) {
 			this.filter(":has(>ul):not(:has(>a))").find(">span").unbind("click.treeview").bind("click.treeview", function(event) {
 				// don't handle click events on children, eg. checkboxes
 				if ( this == event.target )
 					toggler.apply($(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 if not present
 				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 );
 				});
 				hitarea.each(function() {
 				    // move the spacing divs before the hitarea
 				    var t = $(this);
 				    t.siblings('div.space').each(function() {
 				        $(this).remove();
 				        t.before('<div class="space">&nbsp;</div>');
 				    });
 				})
 				
 			}

 			// apply event to hitarea
 			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);
 				};
 			}

 			// 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 );
 				}
 			}
 			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" ]();
 					});
 				}
 			}

 			// 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;
 		}
 	});

 	// classes used by the plugin
 	// need to be styled via external stylesheet, see first example
 	$.treeview = {};
 	var CLASSES = ($.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"
 	});

 	// provide backwards compability
 	$.fn.Treeview = $.fn.treeview;

 })(jQuery);