//** Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//** Created: Jan 7th, 08'

//Version 1.3: April 3rd, 08':
//**1) Script now no longer conflicts with other JS frameworks
//**2) Adds custom oninit() and onopenclose() event handlers that fire when Accordion Content instance has initialized, plus whenever a header is opened/closed
//**3) Adds support for expanding header(s) using the URL parameter (ie: http://mysite.com/accordion.htm?headerclass=0,1)

//April 9th, 08': Fixed "defaultexpanded" setting not working when page first loads

//Version 1.4: June 4th, 08':
//**1) Added option to activate a header "mouseover" instead of the default "click"
//**2) Bug persistence not working when used with jquery 1.2.6

//Version 1.5: June 20th, 08':
//**1) Adds new "onemustopen:true/false" parameter, which lets you set whether at least one header should be open at all times (so never all closed).
//**2) Changed cookie path to site wide for persistence feature
//**3) Fixed bug so "expandedindices" parameter in oninit(headers, expandedindices) returns empty array [] instead of [-1] when no expanded headers found

//**1) Version 1.5.1: June 27th, 08': Fixed "defaultexpanded" setting not working properly when used with jquery 1.2.6

//Version 1.6: Oct 3rd, 08':
//**1) Adds new "mouseoverdelay" param that sets delay before headers are activated when "revealtype" param is set to "mouseover"
//**2) Fixed bug with "onemustopen" param not working properly when "revealtype" is set to "click"

//Version 1.7: March 24th, 09': Adds a 3rd revealtype setting "clickgo", which causes browser to navigate to URL specified inside the header after expanding its contents.

//Version 1.7.1: May 28th, 09': Fixed issue that causes margins/paddings in accordion DIVs to be lost in IE8


var ddaccordion = {

	contentclassname: {}, //object to store corresponding contentclass name based on headerclass

	expandone: function(headerclass, selected)
	{ //PUBLIC function to expand a particular header
		this.toggleone(headerclass, selected, "expand")
	},

	collapseone: function(headerclass, selected)
	{ //PUBLIC function to collapse a particular header
		this.toggleone(headerclass, selected, "collapse")
	},

	expandall: function(headerclass)
	{ //PUBLIC function to expand all headers based on their shared CSS classname
		var $ = jQuery
		var $headers = $('.' + headerclass)
		$('.' + this.contentclassname[headerclass] + ':hidden').each(function()
		{
			$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
		})
	},

	collapseall: function(headerclass)
	{ //PUBLIC function to collapse all headers based on their shared CSS classname
		var $ = jQuery
		var $headers = $('.' + headerclass)
		$('.' + this.contentclassname[headerclass] + ':visible').each(function()
		{
			$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
		})
	},

	toggleone: function(headerclass, selected, optstate)
	{ //PUBLIC function to expand/ collapse a particular header
		var $ = jQuery
		var $targetHeader = $('.' + headerclass).eq(selected)
		var $subcontent = $('.' + this.contentclassname[headerclass]).eq(selected)
		if (typeof optstate == "undefined" || optstate == "expand" && $subcontent.is(":hidden") || optstate == "collapse" && $subcontent.is(":visible"))
			$targetHeader.trigger("evt_accordion")
	},

	expandit: function($targetHeader, $targetContent, config, useractivated, directclick)
	{
		this.transformHeader($targetHeader, config, "expand")
		$targetContent.slideDown(config.animatespeed, function()
		{
			config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
			if (config.postreveal == "gotourl" && directclick)
			{ //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
				var targetLink = ($targetHeader.is("a")) ? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
				if (targetLink) //if this header is a link
					setTimeout(function() { location = targetLink.href }, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
			}
		})
	},

	collapseit: function($targetHeader, $targetContent, config, isuseractivated)
	{
		this.transformHeader($targetHeader, config, "collapse")
		$targetContent.slideUp(config.animatespeed, function() { config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated) })
	},

	transformHeader: function($targetHeader, config, state)
	{
		$targetHeader.addClass((state == "expand") ? config.cssclass.expand : config.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
		.removeClass((state == "expand") ? config.cssclass.collapse : config.cssclass.expand)
		if (config.htmlsetting.location == 'src')
		{ //Change header image (assuming header is an image)?
			$targetHeader = ($targetHeader.is("img")) ? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
			$targetHeader.attr('src', (state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
		}
		else if (config.htmlsetting.location == "prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
			$targetHeader.find('.accordprefix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
		else if (config.htmlsetting.location == "suffix")
			$targetHeader.find('.accordsuffix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
	},

	urlparamselect: function(headerclass)
	{
		var result = window.location.search.match(new RegExp(headerclass + "=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
		if (result != null)
			result = RegExp.$1.split(',')
		return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
	},

	getCookie: function(Name)
	{
		var re = new RegExp(Name + "=[^;]+", "i") //construct RE to search for target name/value pair
		if (document.cookie.match(re)) //if cookie found
			return document.cookie.match(re)[0].split("=")[1] //return its value
		return null
	},

	setCookie: function(name, value)
	{
		document.cookie = name + "=" + value + "; path=/"
	},

	init: function(config)
	{
		// This can cause conflicts in IE7 under certain circumstances (exact circumstances unknown)
		// This CSS class has been hardcoded into WebAlumnus.css to avoid this issue.
		//document.write('<style type="text/css">\n');
		//document.write('.' + config.contentclass + '{display: none}\n'); //generate CSS to hide contents
		//document.write('<\/style>');
		jQuery(document).ready(function($)
		{
			ddaccordion.urlparamselect(config.headerclass)
			var persistedheaders = ddaccordion.getCookie(config.headerclass)
			ddaccordion.contentclassname[config.headerclass] = config.contentclass //remember contentclass name based on headerclass
			config.cssclass = { collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
			config.revealtype = config.revealtype || "click"
			config.revealtype = config.revealtype.replace(/mouseover/i, "mouseenter")
			if (config.revealtype == "clickgo")
			{
				config.postreveal = "gotourl" //remember added action
				config.revealtype = "click" //overwrite revealtype to "click" keyword
			}
			if (typeof config.togglehtml == "undefined")
				config.htmlsetting = { location: "none" }
			else
				config.htmlsetting = { location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
			config.oninit = (typeof config.oninit == "undefined") ? function() { } : config.oninit //attach custom "oninit" event handler
			config.onopenclose = (typeof config.onopenclose == "undefined") ? function() { } : config.onopenclose //attach custom "onopenclose" event handler
			var lastexpanded = {} //object to hold reference to last expanded header and content (jquery objects)
			var expandedindices = ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders != null) ? persistedheaders : config.defaultexpanded)
			if (typeof expandedindices == 'string') //test for string value (exception is config.defaultexpanded, which is an array)
				expandedindices = expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
			var $subcontents = $('.' + config["contentclass"])
			if (expandedindices.length == 1 && expandedindices[0] == "-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
				expandedindices = []
			if (config["collapseprev"] && expandedindices.length > 1) //only allow one content open?
				expandedindices = [expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
			if (config["onemustopen"] && expandedindices.length == 0) //if at least one content should be open at all times and none are, open 1st header
				expandedindices = [0]
			$('.' + config["headerclass"]).each(function(index)
			{ //loop through all headers
				if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $(this).html() != "")
				{ //add a SPAN element to header depending on user setting and if header is a container tag
					$('<span class="accordprefix"></span>').prependTo(this)
					$('<span class="accordsuffix"></span>').appendTo(this)
				}
				$(this).attr('headerindex', index + 'h') //store position of this header relative to its peers
				$subcontents.eq(index).attr('contentindex', index + 'c') //store position of this content relative to its peers
				var $subcontent = $subcontents.eq(index)
				var needle = (typeof expandedindices[0] == "number") ? index : index + '' //check for data type within expandedindices array- index should match that type
				if (jQuery.inArray(needle, expandedindices) != -1)
				{ //check for headers that should be expanded automatically (convert index to string first)
					if (config.animatedefault == false)
						$subcontent.show()
					ddaccordion.expandit($(this), $subcontent, config, false) //Last param sets 'isuseractivated' parameter
					lastexpanded = { $header: $(this), $content: $subcontent }
				}  //end check
				else
				{
					$subcontent.hide()
					config.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
					ddaccordion.transformHeader($(this), config, "collapse")
				}
			})
			$('.' + config["headerclass"]).bind("evt_accordion", function(e, isdirectclick)
			{ //assign custom event handler that expands/ contacts a header
				var $subcontent = $subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
				if ($subcontent.css('display') == "none")
				{
					ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
					if (config["collapseprev"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0))
					{ //collapse previous content?
						ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
					}
					lastexpanded = { $header: $(this), $content: $subcontent }
				}
				else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0))
				{
					ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
				}
			})
			$('.' + config["headerclass"]).bind(config.revealtype, function()
			{
				if (config.revealtype == "mouseenter")
				{
					clearTimeout(config.revealdelay)
					var headerindex = parseInt($(this).attr("headerindex"))
					config.revealdelay = setTimeout(function() { ddaccordion.expandone(config["headerclass"], headerindex) }, config.mouseoverdelay || 0)
				}
				else
				{
					$(this).trigger("evt_accordion", [true])
					return false //cancel default click behavior
				}
			})
			$('.' + config["headerclass"]).bind("mouseleave", function()
			{
				clearTimeout(config.revealdelay)
			})
			config.oninit($('.' + config["headerclass"]).get(), expandedindices)
			$(window).bind('unload', function()
			{ //clean up and persist on page unload
				$('.' + config["headerclass"]).unbind()
				var expandedindices = []
				$('.' + config["contentclass"] + ":visible").each(function(index)
				{ //get indices of expanded headers
					expandedindices.push($(this).attr('contentindex'))
				})
				if (config.persiststate == true && $('.' + config["headerclass"]).length > 0)
				{ //persist state?
					expandedindices = (expandedindices.length == 0) ? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
					ddaccordion.setCookie(config.headerclass, expandedindices)
				}
			})
		})
	}
}