// pgstats - poor mans page statistics.. 
// NOT based on prototype or jquery - cause it must be lightweight

// // get our script src, to know our baseurl so we can call home
// var pgstatsScriptSource = (function(scripts) {
//     var scripts = document.getElementsByTagName('script'),
//         script = scripts[scripts.length - 1];	// at ths very moment, we are the last script guaranteed
// 
//     if (script.getAttribute.length !== undefined) {
//         return script.src
//     }
// 
//     return script.getAttribute('src', -1)
// }());

var pgstats= {
	browser: navigator.userAgent,
	uid: '',
	scr: screen.width.toString()+'x'+screen.height.toString(),
	url: document.URL,
	referrer: document.referrer,
	ecollect: {},
	baseurl: 'http://www.yubby.com/',	// pgstatsScriptSource.substr(0,pgstatsScriptSource.lastIndexOf('/pgstats/')),
	init: function() {
		if (!(this.uid=this.readCookie('pgstats'))) {
			this.uid= Math.round(Math.random() * 2147483647).toString();
			this.uid+= Math.round(Math.random() * 2147483647).toString();
			this.createCookie('pgstats',this.uid,365*2);
		}
	}, 
	xPageHit: function () {
		var xhReq=this.createXMLHttpRequest();
		if (!xhReq)
			return 'ERR:xhReq';	// forget it..
		if (!this.baseurl)
			return 'ERR:baseurl';	// forget it..
		xhReq.open('get',this.baseurl+'pgstats/tick?'+this.collectInfo(),true);
		// xhReq.onreadystatechange = function() {
		//     if (xhReq.readyState != 4)  { return; }
		//     var serverResponse = xhReq.responseText;
		//     alert(serverResponse);
		// };
		xhReq.send();
		return 'OK';
	},
	collectInfo: function() {
		var rv;
		rv='ts=' + new Date().getTime();
		//rv+='&br='+this.encURI(this.browser);
		rv+='&uid='+this.uid;
		rv+='&url='+this.encURI(this.url);
		rv+='&refer='+this.encURI(this.referrer);
		//rv+='&ssrc='+this.encURI(this.baseurl);
		rv+='&scr='+this.scr;
		for (i in this.ecollect) {
			rv+='&'+i+'='+this.encURI(this.ecollect[i]);
		}

		return rv;
	},
	addcollect: function(key,val) {
		this.ecollect[key]=val;
	},
	//------- helper functions ----------
	createCookie: function (name,value,days) {
		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=/";
	},
	readCookie: function(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;
	},
	eraseCookie: function(name) {
		createCookie(name,"",-1);
	},
	encURI: function(url) {
		//return encodeURIComponent(url);	// forgets to encode a lot of chars. Useless
		var s = escape(url);	// this is the most complete one, however forgets to encode star, slash, @ and +
		s = s.replace(/\*/g,"%2A");
		s = s.replace(/\//g,"%2F");
		s = s.replace(/\@/g,"%40");
		s = s.replace(/\+/g,"%2B");
		return s;
	},
	createXMLHttpRequest: function() {
  		try { return new XMLHttpRequest(); } catch(e) {}
		try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
		try { return new ActiveXObject('Microsoft.XMLHTTP'); } catch (e) {}
		return null;
	}
}
pgstats.init();
//pgstats.addcollect('vid','234234');
//pgstats.xPageHit();