(function() {
	var statsRoot = 'https://stats.advitum.de/';
	
	function sendRequest(data) {
		var url = statsRoot + 'data.php?data=' + btoa(JSON.stringify(data)) + '&ch=' + Math.random();
		
		var scriptElement = document.createElement('script');
		scriptElement.setAttribute('type', 'text/javascript');
		scriptElement.setAttribute('src', url);
		
		document.body.appendChild(scriptElement);
	}
	
	function createCookie(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=/";
	}
	
	function readCookie(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;
	}
	
	function userHasAdblocker(callback = function(){}) {
		var classes = 'pub_300x250 pub_300x250m pub_728x90 text-ad textAd text_ad text_ads text-ads text-ad-links';
		var styles = 'width: 1px !important; height: 1px !important; position: absolute !important; left: -10000px !important; top: -1000px !important;';
		
		var bait = document.createElement('div');
		bait.setAttribute('class', classes);
		bait.setAttribute('style', styles);
		window.document.body.appendChild(bait);
		
		setTimeout(function() {
			var detected = false;
			if(window.document.body.getAttribute('abp') !== null
				|| bait.offsetParent === null
				|| bait.offsetHeight == 0
				|| bait.offsetLeft == 0
				|| bait.offsetTop == 0
				|| bait.offsetWidth == 0
				|| bait.clientHeight == 0
				|| bait.clientWidth == 0
			) {
				detected = true;
			}
			
			if(window.getComputedStyle !== undefined) {
				var baitTemp = window.getComputedStyle(bait, null);
				if(baitTemp && (baitTemp.getPropertyValue('display') == 'none' || baitTemp.getPropertyValue('visibility') == 'hidden')) {
					detected = true;
				}
			}
			
			window.document.body.removeChild(bait);
			
			callback(detected);
		}, 1);
	}
	
	if(readCookie('stats2_user') === null) {
		createCookie('stats2_user', (Date.now() + Math.random()).toString(), 365);
	}
	
	userHasAdblocker(function(adBlocker) {
		var additional = {
			adBlocker: adBlocker
		};
		
		sendRequest({
			referrer: document.referrer,
			url: document.location.toString(),
			user: readCookie('stats2_user'),
			additional: JSON.stringify(additional)
		});
	});
})();