var AjaxContent = Class.create({

	initialize: function(container) {

		

		// Get options

		this.options = Object.extend({

			urlPostfix:			'',

			catchSameUrl:		false,

			initAnchor:			false,

			useAnchor:			false,

			useAnalytics:		false,

			titlePrefix:		null,

			titleSeperator:		' | ',

			loadingDiv:			null,

			loadDelay:			800,

			

			// Callback functions

			preCallback:		null,

			postCallback:		null,

			anchorCallback:		null

		}, arguments[1] || {} );

		

		// Set member variables

		this.container = container;

		this.isRunning = false;

		this.loadTimer = null;

		this.url = null;

		this.debug = false;

		// Check for an initail anchor

		if(this.options.initAnchor == true && this.options.useAnchor == true) {

			this.getAnchor(); }

	},

	

	// Place the contents of the url into this.element

	getContent: function(url) {

		if (this.debug) console.log('AjaxContent.getContent: '+url);

		// Don't do anything if url is blank

		if(!url) { return; }



		// Don't reload the same thing

		if(this.url == url && this.options.catchSameUrl == true) {

			return; }

		this.url = url;



		// Check isRunning

		if(this.isRunning == true) {

			return; }

		this.isRunning = true;



		// Call the pre callback

		if(this.options.preCallback != null) {

			this.options.preCallback(this); }

		

		// Start a timer to perform an action on a long load time

		this.startLoad();

		

		// Make a this object

		var thisObj = this;

		

		// Start the AJAX request

		new Ajax.Request(url + this.options.urlPostfix, {

			onFailure: function(req) {

				

				// Cancel the load delay timer

				thisObj.finishLoad();

					

				// Show an error

				thisObj.displayContent('Page not found.');

					

				// Set the anchor to 'error'

				if(thisObj.options.useAnchor == true) {

					thisObj.setAnchor('error'); }

					

				// Send the page to analytics so we can track the ajax page changes

				if(thisObj.options.useAnalytics == true) {

					pageTracker._trackPageview("/error.php"); }

			},

			onSuccess: function(req) {

				

				// Cancel the load delay timer

				thisObj.finishLoad();

				

				// Check for JSON response

				if(req.responseJSON) {

					thisObj.displayContent(req.responseJSON); }

				

				// Check for XML response, if no XML send the text

				else if(!req.responseXML) {

					thisObj.displayContent(req.responseText); }

				else if(!req.responseXML.documentElement) {

					thisObj.displayContent(req.responseText); }

				

				// Else, parse the xml

				else

				{

					// Get the xml response

					var xmlRoot = req.responseXML.documentElement;

					

					// Show the content

					var contentStr = thisObj.parseContent(xmlRoot, 'content', true);

					if(contentStr != null) {

						thisObj.displayContent(contentStr); }

					

					// Check for a specific title tag

					if(thisObj.options.titlePrefix != null)

					{

						document.title = thisObj.options.titlePrefix;

						var titleTag = xmlRoot.getElementsByTagName('title');

						if(titleTag.length > 0)

						{

							var specificTitle = titleTag[0].getAttribute('name');

							if(specificTitle != null) {

								document.title += thisObj.options.titleSeperator + specificTitle; }

						}

					}

				}

				

				// Get the page from the url

				var page = thisObj.getPage(url);

				

				// Set the anchor to the current page

				if(thisObj.options.useAnchor == true) {

					thisObj.setAnchor(page); }

					

				// Send the page to analytics so we can track the ajax page changes

				if(thisObj.options.useAnalytics == true) {

					pageTracker._trackPageview("/" + page); }

			}

		});

	},

	

	parseContent: function(xmlRoot, tagName, required)

	{

		// This check will only work in ie

		// Need to check for parseerror in firefox

		//if(xmlRoot == null) {

		//	return false; }

		

		var contentTag = xmlRoot.getElementsByTagName(tagName);

		var xmlString = "";

		

		// Write the content to the document

		if(contentTag.length > 0)

		{

			if(contentTag[0].xml)

			{

				for(node_i = 0; node_i < contentTag[0].childNodes.length; node_i++) {

					xmlString += contentTag[0].childNodes[node_i].xml; }

			}

			else

			{

				for(node_i = 0; node_i < contentTag[0].childNodes.length; node_i++) {

					xmlString += (new XMLSerializer()).serializeToString(contentTag[0].childNodes[node_i]); }

			}

			

			xmlString = xmlString.strip();

			if(xmlString != "") {

				return xmlString; }

		}

		else if(required == true) {

			this.displayContent('Required tag, ' + tagName + ', not found.'); }

			

		return null;

	},

	

	// Call the success callback

	displayContent: function(text) {

		if(typeof(this.options.postCallback) == 'function') {

			this.options.postCallback(this, text); }

		else

		{

			$(this.container).update(text);

			this.isRunning = false;

		}

	},

	

	// Start a timer to perform an action on a long load time

	startLoad: function() {

		var div;

		if( this.options.loadingDiv != null && (div = $(this.options.loadingDiv)) )

		{

			//var dims = document.viewport.getDimensions();

			var dims = $(document.body).getDimensions();

			div.setOpacity(loadingOpacity);

			div.setStyle({width: dims.width + 'px', height: dims.height + 'px'});

			this.loadTimer = setTimeout(function(){div.show()}, this.options.loadDelay);

		}

	},

	

	// Cancel the load delay timer

	finishLoad: function() {

		if(this.loadTimer != null)

		{

			clearTimeout(this.loadTimer);

			this.loadTimer = null;

			$(this.options.loadingDiv).hide();

		}

	},

	

	// Take an anchor from the address bar

	getAnchor: function() {

		var anchor = window.location.hash;

		var pageMatch = /^#(.+)$/;

		var pageArray = pageMatch.exec(anchor);

		

		if(pageArray)

		{

			var anchorStr = pageArray[1] + '.php';

			

			if(this.options.anchorCallback != null) {

				this.options.anchorCallback(anchorStr); }

			

			this.getContent(anchorStr);

		}

	},

	

	// Put the page in the hash for bookmarks and navigation

	setAnchor: function(page) {

		window.location.hash = "#" + page;

	},

	

	getPage: function(url) {

		var pageMatch = /^(?:[^\/]*\/)*([^\.]+)\.php$/;

		var pageArray = pageMatch.exec(url);

		

		if(pageArray) {

			return pageArray[1]; }

		else {

			return null; }

	}

});