// gaTracker: jQuery Google Analytics Integration

// A quicker, automated way to embed Google Analytics.

// (c)2007 Jason Huck/Core Five Creative

//         Adapted for new Google Analytics code by Rick Harrison / AWADigital.com, 18th Feb 2008.

//

// Requires jQuery 1.2.x or higher (for cross-domain $.getScript)

//

// Usage:

// 

// Only a tracking code is required:

// $.gaTracker('UA-XXXXX-XX');

// 

// ...but other options can be specified:

// $.gaTracker(

//		'UA-XXXXX-XX',

//		{

//			external:	'/external/',

//			mailto:		'/mailto/',

//			download:	'/downloads/',

//			extensions:	[

//				'pdf','doc','xls','csv','jpg','gif', 'mp3',

//				'swf','txt','ppt','zip','gz','dmg','xml'		

//			]

//		}

//	);

//

// TODO: more testing, delay after $.getScript for Safari





(function($){

	$.gaTracker = function(code, opts){

		opts = jQuery.extend({

			external:	'/external/',

			mailto:		'/mailtos/',

			download:	'/downloads/',

			extensions: [

					'pdf','doc','xls','csv','jpg','gif', 'mp3',

					'swf','txt','ppt','zip','gz','dmg','xml'		

			]	

		}, opts);

		

		// Returns the given URL prefixed if it is:

		//		a) a link to an external site

		//		b) a mailto link

		//		c) a downloadable file

		// ...otherwise returns an empty string.

		function decorateLink(u){

			var trackingURL = '';

			

			if(u.indexOf('://') == -1 && u.indexOf('mailto:') != 0){

				// no protocol or mailto - internal link - check extension

				var ext = u.split('.')[u.split('.').length - 1];			

				var exts = opts.extensions;

				

				for(i = 0; i < exts.length; i++){

					if(ext == exts[i]){

						trackingURL = opts.download + u;

						break;

					}

				}				

			} else {

				if(u.indexOf('mailto:') == 0){

					// mailto link - decorate

					trackingURL = opts.mailto + u.substring(7);					

				} else {

					// complete URL - check domain

					var regex = /([^:\/]+)*(?::\/\/)*([^:\/]+)(:[0-9]+)*\/?/i;

					var linkparts = regex.exec(u);

					var urlparts = regex.exec(location.href);					

					if(linkparts[2] != urlparts[2]) trackingURL = opts.external + u;

				}

			}

			

			return trackingURL;			

		}

		

		var add_tracking_count = 0;

		var interval = 0;

		// add tracking code to the current page

		

		function checkObjectExists() {

			//alert('trying...');

			

			if(typeof(_gat) == "object") {

				addTracking();

			} else {

				

				interval = setInterval(function(){

				//	alert('check again...');

					if(typeof(_gat) == "object") {

						addTracking();

					}

				}, 5000);



			}

			

		}

		

		

		function addTracking(){

			// just make sure we dont try adding the app forever if the google code hasn't downloaded...

			clearInterval(interval);

			var pageTracker = _gat._getTracker(code);

			pageTracker._initData();

			pageTracker._trackPageview();	

			//alert('tracking')

	

			// examine every link in the page

			$('a').each(function(){

				var u = $(this).attr('href');

				

				if(typeof(u) != 'undefined'){

					var newLink = decorateLink(u);



					// if it needs to be tracked manually,

					// bind a click event to call GA with

					// the decorated/prefixed link

					if(newLink.length){

						$(this).click(function(){

							pageTracker._trackPageview(newLink);

						});

					}

				}				

			});

		}

		

		// include the external GA script in try/catch to play nice

		function initGA(){

			try {

				var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");

				// include the script

				$.getScript(gaJsHost + "google-analytics.com/ga.js", function(){

					//alert('loaded');

					checkObjectExists();

				});

				

			} catch(err) {

				// log any failure

				console.log('Failed to load Google Analytics:' + err);

			}

		}

		

		initGA();

	}

})(jQuery);