/*!
 * Entourage 1.1.1 - Automatic Download Tracking for Asynchronous Google Analytics
 *
 * Copyright (c) 2011 by Tian Valdemar Davis (http://techoctave.com/c7)
 * Licensed under the MIT (http://en.wikipedia.org/wiki/MIT_License) license.
 *
 * Learn More: http://techoctave.com/c7/posts/58-entourage-js-automatic-download-tracking-for-asynchronous-google-analytics
 */
(function() {
var entourage = new (function() {
	var version = "1.1.1";
	
	//Get true FileName from link pathname
	var getFileName = function(pathname) {
		//Remove the anchor at the end (if one exists)
		pathname = pathname.substring(0, (pathname.indexOf("#") == -1) ? pathname.length : pathname.indexOf("#"));

		//Removes the query after the file pathname (if one exists)
		pathname = pathname.substring(0, (pathname.indexOf("?") == -1) ? pathname.length : pathname.indexOf("?"));

		//Removes everything before the last slash in the path
		pathname = pathname.substring(pathname.lastIndexOf("/") + 1, pathname.length);

		return pathname;
	};

	var autograph = function() {
		//console.log("autograph");
		var whitelist, pathname, match, fileName, associate;
		
		whitelist = /\.pdf$|\.zip$|\.od*|\.doc*|\.xls*|\.ppt*|\.exe$|\.dmg$|\.mov$|\.avi$|\.mp3$/i;
		
		pathname = this.pathname; //The link object is now available in "this"
		
		//Compare the fileType to the whitelist
		match = pathname.match(whitelist);
		
		if (typeof match !== "undefined" && match !== null) {
			//Get the file name
			fileName = getFileName(pathname);

			//Add file to the Google Analytics Queue
			associate = '/download/' + fileName;
			
			//console.log("associate: " + associate);
			
			_gaq.push(['_trackPageview', associate]);
		}
    };

	var initialize = function() {
		//console.log("initialize");
		var links = document.links;
		
	    for (var i=0, l=links.length; i<l; i++) {
			//Call Entourage whenever the link is clicked
	        links[i].onclick = autograph;
	    }
    };

	return {
		version: version,
		initialize: initialize
	};
})(); //Entourage.js

//Add entourage to the global namespace
window.entourage = entourage;

//Execute entourage onload - ensuring links are present in the DOM
window.onload = entourage.initialize;
})();