/**
 * HoverAccordion - jQuery plugin for intuitively opening accordions and menus
 * http://berndmatzner.de/jquery/hoveraccordion/
 * Copyright (c) 2007 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: 0.4
 *
 * Usage:
 * $('#YourUnorderedListID').hoverAccordion();
 * or
 * $('.YourUnorderedListClass').hoverAccordion({
 * 	speed: 'slow',
 * 	activateitem: '1',
 * 	active: 'current',
 * 	header: 'title',
 * 	hover: 'highlight',
 * 	opened: 'arrowdown',
 * 	closed: 'arrowup'
 *  keepheight: 'true'
 * });
 */

(function($)
{
	$.fn.hoverAccordion = function(options)
	{
		// Setup options
		options = jQuery.extend(
        {
            speed:          'fast',     // Speed at which the subitems open up - valid options are: slow, normal, fast
            activateitem:   'false',     // 'true': Automatically activate items with links corresponding to the current page, '2': Activate item #2
            active:         'active',   // Class name of the initially active element
            header:         'header',   // Class name for header items
            hover:          'hover',    // Class name for hover effect
            opened:         'opened',   // Class name for open header items
            closed:         'closed',   // Class name for closed header items
            keepheight:     'true'      // 'true': Set the height of each accordion item to the size of the largest one, 'false': Leave height as is
        }, options);

		// Current hover status
		thislist = $(this);
		thislist.attr('hovering','false');

		// Current URL
		var thisurl = window.location.href;

		// Change display status of subitems when hovering
		function doHover(obj)
		{
		    if( $(obj).html() == undefined ) obj = this;

			// Change only one display status at a time
			if( thislist.attr('hovering') == 'false' )
			{
			    var newelem = $(obj).parent().children('ul');
			    var oldelem = $(obj).parent().parent().children('li').children('ul:visible');
			    if( options.keepheight == 'true' )
			    {
			        thisheight = maxheight;
			    } else {
			        thisheight = newelem.height();
			    }

				// Change display status if not already open
				if( !newelem.is(':visible') )
				{
					// Hovering in progress
					thislist.attr('hovering','true');

					if( !oldelem.length > 0 )
					{
					    newelem.animate(
    					{
    					    height: thisheight
    					},
    					{
        					duration: options.speed,
        					easing: 'linear'
    					});
					}
					else
					{
					   newelem.show();
					}

					oldelem.animate(
					{
					    height: 'hide'
					},
					{
    					step: function(n)
    					{
    					   newelem.height(Math.ceil(thisheight - n));
    					},
    					duration: options.speed,
    					easing: 'linear'
					});

					// Switch classes for headers
					oldelem.parent().children('b').addClass(options.closed).removeClass(options.opened);
					newelem.parent().children('b').addClass(options.opened).removeClass(options.closed);

        			// Make sure we've come to a complete stop before changing another item
        			resetHover = window.setTimeout("thislist.attr('hovering','false');",600);
				}
			}
		};

		// Do nothing (necessary for the hoverIntent plugin)
		function doNothing()
		{
		};

		var itemNo = 0;
		var maxheight = 0;

		// Setup initial state and hover events
		$(this).children('li').each(function()
		{
		    var thisitem = $(this);

			itemNo++;

			// Set current link to current URL to 'active' and disable anchor links
			var thislink = thisitem.children('b');

			if( thislink.length>0 )
			{
    			// Hover effect for all links
    			thislink.hover(function()
    			{
    				$(this).addClass(options.hover);
    			}, function()
    			{
    				$(this).removeClass(options.hover);
    			});

				var thishref = thislink.attr('href');

				if( thishref == '#' )
				{
				    // Add a click event if the header does not contain a link
					thislink.click(function() {
					    thislist.attr('hovering','false');
					    doHover(this);
					    this.blur();
					    return false;
					});
				}
				else if( options.activateitem == 'true' && thisurl.indexOf(thishref)>0 && thisurl.length-thisurl.lastIndexOf(thishref) == thishref.length )
				{
					thislink.parent().addClass(options.active);
				}
			}

			var thischild = thisitem.children('ul');

			// Initialize subitems
			if( thischild.length > 0 )
			{
			    if( maxheight < thischild.height() ) maxheight = thischild.height();

				// Change appearance of the header element of the active item
				thischild.children('li.'+options.active).parent().parent().children('b').addClass(options.header);

				// Bind hover events to all subitems
				try
				{
					// If Brian Cherne's 'hoverIntent' plugin is available, use it for safe hovering
					thislink.hoverIntent(
					{
						sensitivity: 1,
						interval: 80,
						over: doHover,
						timeout: 600,
						out: doNothing
					});
				}
				catch(err)
				{
					// Regular hover function if hoverIntent isn't available
					thislink.hover(function()
					{
					    doHover(this);
					}, function()
					{
                        doNothing();
					});
				}

			    // Set current link to current URL to 'active'
				if( options.activateitem == 'true' )
				{
					thischild.children('li').each(function()
					{
						var m = $(this).children('b').attr('href');
						if( m )
						{
							if( thisurl.indexOf(m) > 0 && thisurl.length-thisurl.lastIndexOf(m) == m.length )
							{
								$(this).addClass(options.active).parent().parent().children('b').addClass(options.opened);
							}
						}
					});
				}
				else if( parseInt(options.activateitem) == itemNo )
				{
					thisitem.addClass(options.active).children('b').addClass(options.opened);
				}
			}

			// Close all subitems except for those with active items
            thischild . not($(this).parent().children('li.'+options.active).children('ul')) . not(thischild.children('li.'+options.active).parent()) . hide() . parent().children('b') . addClass(options.closed);
		});
	};
})(jQuery);