// JavaScript Document
// gaTrack - Google Analytics Tracker (GA)
// (c)2009 Created by Kora
//
// Requires jQuery 1.2.x or higher (for cross-domain GAscript $.getScript)
//
// Usage:
// 
// Normal use:
// $.gaTrack('UA-XXXXX-XX');
// 
// Advance use:
// $.gaTrack(
//        'UA-XXXXX-XX',
//        {
//            download:    '/downloads/',
//            extensions:    [
//                'pdf','doc','xls','csv','jpg','gif', 'mp3', 'swf','txt','ppt','zip','gz','dmg','xml'        
//            ],
//            cd_active: false,
//            cd_domainname: "none"
//        }
//    );
//



(function($){
    $.gaTrack = function(code, opts){
        opts = jQuery.extend({
            download:    '/downloads/',
            extensions: [
                    'pdf','doc','xls','csv','jpg','gif', 'mp3', 'swf','txt','ppt','zip','gz','dmg','xml'        
            ],
            cd_active: false, //use if you want to active tracking between different domains (cross-domain)
            cd_domainname: "none" //set the domainname (cross-domain use)
        }, opts);
        
        // add tracking code to the current page
        function addTracking(){
            var pageTracker = _gat._getTracker(code);
            if(opts.cd_active){
                pageTracker._setDomainName(opts.cd_domainname);
                if(opts.cd_domainname == "none"){
                    pageTracker._setAllowLinker(true);
                }else if(opts.cd_domainname.substr(0,1)=="."){
                    pageTracker._setAllowHash(false);
                };
            };
            pageTracker._initData();
            pageTracker._trackPageview();
        
            // examine every link in the page
            $('a').each(function(){
                var _self = $(this);
                var u = $(this).attr('href');
                var isDownload = false;
                var docmediator = u.search("document.mediator.xml");
                var docurllength = u.length;
                if(typeof(u) != 'undefined'){
                    if (docmediator != "-1") {
                        uext = u.substring(u.lastIndexOf("=") + 1, u.length);
                    }else{
                    
                        if(u.indexOf("?")!=-1){
                            uext = u.substring(0, u.lastIndexOf("?"));
                        }else{
                            uext = u;    
                        };
                    };
                    
                    var ext = uext.split('.')[uext.split('.').length - 1];            
                    var exts = opts.extensions;
                    //check extensions
                    for(i = 0; i < exts.length; i++){
                        if(ext == exts[i]){
                            _self.click(function(){
                                pageTracker._trackPageview(opts.download + cleanURL(_self.attr('href')));
                            });
                            isDownload = true;
                            break;
                        };
                    };
                    
                    if(!isDownload && opts.cd_active && (opts.cd_domainname == "none")){
                        $(this).click(function(){
                            pageTracker._link(u);
                            return false;
                        });
                    };
                    
                };        
            });
        };
        function cleanURL( link_href ){
            return link_href.replace(/..\//g, "");
        };
        // include the external GA script in try/catch to play nice
        function initGA(){
            try{
                // determine whether to include the normal or SSL version
                var gaURL = (location.href.indexOf('https') == 0 ? 'https://ssl' : 'http://www');
                gaURL += '.google-analytics.com/ga.js';
        
                // include the script
                $.getScript(gaURL, function(){
                    addTracking();
                });
            } catch(err) {
                // log any failure
                console.log('Failed to load Google Analytics:' + err);
            };
        };
        
        initGA();
    };
})(jQuery);