/**
* HoverAccordion - jQuery plugin for intuitively opening accordions and menus
* 
* http://berndmatzner.de/jquery/hoveraccordion/
* 
* Copyright (c) 2008-2010 Bernd Matzner
* 
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* 
* Version: 0.9.0
* 
* Requires jQuery 1.4.4 or higher
*/
(function($) {
	$.fn.hoverAccordion = function(options) {
		// Setup options
		options = jQuery.extend({
		// Speed at which the subitems open up - valid options are: slow,
		// normal, fast, or integer for duration in milliseconds
		speed : 'fast',
		// true: Automatically activate items with links corresponding to
		// the current page, 2: Activate item #2 (numbering starts with 1!)
		activateItem : true,
		// true: Set the height of each accordion item to the size of the
		// largest one, false: Leave height as is
		keepHeight : false,
		// true: Handle accordion on click only rather than hovering, false:
		// React to hovering
		onClickOnly : true,
		// Class name of the initially active element
		classActive : 'menuactive',
		// Class name for header items
		classHeader : 'menuheader',
		// Class name for hover effect
		classHover : 'menuhover',
		// Class name for open header items
		classOpen : 'menuopened',
		// Class name for closed header items
		classClosed : 'menuclosed'
		}, options);
	
		// Current hover status
		var container = this;
	
		// Current URL
		var pageHref = window.location.href;
	
		// Interval for detecting intended element activation
		var i = 0;
	
		// Change display status of subitems when hovering
		function doHover(itemList, itemHeader, listHeight) {
			// Change only one display status at a time
			var oldList = $(container).find('.' + options.classOpen).closest('li').find('ul:first');
			if(itemHeader.hasClass(options.classOpen)) {		
				itemHeader.animate({
					height : 0
				}, {
					step : function(n, fx) {
						itemHeader.height(listHeight - n);
					},
					duration : options.speed
				}).children().hide();
				
				itemHeader.closest('li').removeClass(options.classActive).find('a:first').addClass(options.classClosed).removeClass(options.classOpen);
			}
	
			if (false === oldList.is(':animated')) {
				if (options.keepHeight == true) {
					listHeight = maxHeight;
				}
		
				// Change display status if not already open
				if (itemHeader.hasClass(options.classOpen) == false) {
					itemList.children().show();
					itemList.animate({
						height : listHeight
					}, {
						step : function(n, fx) {
	    						itemList.height(listHeight - n);
						},
						duration : options.speed
					});
		
					oldList.animate({
						height : 0
					}, {
						step : function(n, fx) {
	    						itemList.height(listHeight - n);
						},
						duration : options.speed	
					}).children().hide();
		
					// Switch classes for headers           
					itemHeader.addClass(options.classOpen).removeClass(options.classClosed);
					oldList.closest('li').removeClass(options.classActive).find('a:first').addClass(options.classClosed).removeClass(options.classOpen);
				}
			}
		}
	
		var itemNo 	= 0;
		var maxHeight 	= 0;
		
		// Setup initial state and hover events
		$(this).children('li').each(function() {         
			var item = $(this);
			var isActive = false;
			
			itemNo++;
			var itemHeader = item.find('a:first').addClass(options.classHeader);
		
			if (itemHeader.length > 0) {
				// Hover effect for all links
				itemHeader.hover(function() {
					itemHeader.addClass(options.classHover);
				}, function() {
					itemHeader.removeClass(options.classHover);
				});
	
				var itemHref = itemHeader.attr('href');
			
				if (itemHref == '#') {
					// Add a click event if the header does not contain a link
					itemHeader.click(function() {
						this.blur();
						return false;
					});
				} else if (options.activateItem == true && pageHref.indexOf(itemHref) > 0 && pageHref.length - pageHref.lastIndexOf(itemHref) == itemHref.length) {
					isActive = true;
					item.addClass(options.classActive);
					itemHeader.removeClass(options.classClosed).addClass(options.classOpen);
				}
			}
	
			var itemList = item.find('ul:first');
			
			// Initialize subitems
			if (itemList.length > 0) {
				var listHeight = itemList.height();
				
				if (maxHeight < listHeight)
					maxHeight = listHeight;
		
				if (options.onClickOnly == true) {
					itemHeader.click(function() {
						doHover(itemList, itemHeader, listHeight);
					});
				} else {
					// Bind hover events to all headers of sublists
					itemHeader.hover(function() {
						i = setInterval(function() {
	    						doHover(itemList, itemHeader, listHeight);
	    						clearInterval(i);
						}, 400);
					}, function() {
						clearInterval(i);
					});
				}
			
				// Set current link to current URL to 'active'
				if (options.activateItem == true) {
					itemList.children('li').each(function() {
						var m = $(this).find('a').attr('href');
						if (m) {
	    						if (pageHref.indexOf(m) > 0 && pageHref.length - pageHref.lastIndexOf(m) == m.length) {
	        						isActive = true;
	        						item.addClass(options.classActive);
	        						itemHeader.removeClass(options.classClosed).addClass(options.classOpen);
	    						}
						}
					});
				} else if (parseInt(options.activateItem, 10) == itemNo) {
					isActive = true;
					item.addClass(options.classActive);
					itemHeader.removeClass(options.classClosed).addClass(options.classOpen);
				}
			}
	
			// Close all subitems except for those with active items
			if (!isActive) {
				itemHeader.removeClass(options.classOpen);
				if (itemList.length > 0) {
					itemList.children().hide();
					itemHeader.addClass(options.classClosed);
				}
			}
		});
	
		return this;
	};
})(jQuery);