function debug(e) {
	if(console)console.warn(e);
}


function wl_XMLHttp() {
	var xmlhttp;
	try {
	    // Mozilla / Safari / IE7
	    xmlhttp = new XMLHttpRequest();
	} catch (e) {
	     // IE
	     var XMLHTTP_IDS = new Array('MSXML2.XMLHTTP.5.0',
	                                'MSXML2.XMLHTTP.4.0',
	                                'MSXML2.XMLHTTP.3.0',
	                                'MSXML2.XMLHTTP',
	                                'Microsoft.XMLHTTP' );
	     var success = false;
	     for (var i=0;i < XMLHTTP_IDS.length && !success; i++) {
	         try {
	              xmlhttp = new ActiveXObject(XMLHTTP_IDS[i]);
	                 success = true;
	           } catch (e) {}
	     }
	     if (!success) {
	         debug('Unable to create XMLHttpRequest.');
	     }
	}
	this.xmlhttp = xmlhttp;
}

function wl_WorldLogger(hash, params) {
	this.getVars = function() {
		return {hash:this.wl_hash, referer:document.referrer, page:window.location, uid:this.getUniqueId(), os:BrowserDetect.OS, browser:BrowserDetect.browser, browser_version:BrowserDetect.version, type:1};	
	}
	
	this.getVarString = function() {
		var var_string = "";
		var vars = this.getVars();
		var first = true;
		for(var key in vars) {
			if(first) var_string += "?";
			else var_string += "&";
			first =  false;
			var_string += key + "=" + escape(vars[key]);
		}
		return var_string;
	}
	
	this.getUniqueId = function() {
		var lId = this.readCookie();
		if(lId == null) {
			lId = this.createUniqueId();
			this.createCookie(lId);
		}
		
		return lId;
	}
	
	this.createUniqueId = function(size)
	{
		var size = 8;
		var str = "";
		var chars = "0123456789abcdefghijklmnopqurstuvwxyzABCDEFGHIJKLMNOPQURSTUVWXYZ";
		for(var i = 0; i < size; i++)
		{
			str += chars.substr( Math.floor(Math.random() * 62), 1 );
		}
		return str;
	}

	this.createCookie = function(value) {
		var days = 365;
		var name = this.cookie_name;
		if (days) {
			var date = new Date();
			date.setTime(date.getTime()+(days*24*60*60*1000));
			var expires = "; expires="+date.toGMTString();
		}
		else var expires = "";
		document.cookie = name+"="+value+expires+"; path=/";
	}

	this.readCookie =  function() {
		var name = this.cookie_name;
		var nameEQ = name + "=";
		var ca = document.cookie.split(';');
		for(var i=0;i < ca.length;i++) {
			var c = ca[i];
			while (c.charAt(0)==' ') c = c.substring(1,c.length);
			if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
		}
		return null;
	}
	
	this.cookie_name = '_wlogger_pinger';
	BrowserDetect.init();
	// constructor
	this.wl_hash = hash;
	var ping_location = params && params.ping_location ? params.ping_location : "http://ping.worldlogger.com/ping";
	ping_location += this.getVarString();
	this.xmlhttp = new wl_XMLHttp();
  	

	try {

	this.xmlhttp.xmlhttp.open("GET", ping_location, true);
	this.xmlhttp.xmlhttp.send(null);
	} catch(e) {
		debug(e)
	}
}



var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "";
		this.OS = this.searchString(this.dataOS) || "";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{
			string: navigator.userAgent,
			subString: "Chrome",
			identity: "chrome"
		},
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "omniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "safari",
			versionSearch: "Version"
		},
		{
			prop: window.opera,
			identity: "opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "icab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "mac"
		},
		{
			   string: navigator.userAgent,
			   subString: "iPhone",
			   identity: "iphoneipod"
	    },
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "linux"
		}
	]

};