//document.getElementById('bla')._ifs_processed = true;
//var seed = Math.floor(Math.random() * (new Date).getTime()) % 4000000000; // 32bit max
//var uniqid = seed.toString(16);
//alert(uniqid);





/*
 Comments:
 - Record stats:
   - Page URL
   - Page title
   - Link Href
   - Link Text
   - Page referer + search text
   - IP address (calculate GeoIP)
   - Language
   - Browser
   - Operating system
   - Screen resolution
   - Browser window size
 - URL should not exceed 2048 chars
 - Skip internal site pages
*/

function ifsSetCookie (name, value) {
    var expires = 'Wed, 01 Jan 2020 00:00:00 +0000';
    document.cookie = name + "=" + escape(value) +
        "; expires=" + expires +
        "; path=/";
        //((expires) ? "; expires=" + expires : "") +
        //((path) ? "; path=" + path : "");
        //((domain) ? "; domain=" + domain : "") +
        //((secure) ? "; secure" : "");
}

function ifsGetCookie(name) {
    var cookie = " " + document.cookie;
    var search = " " + name + "=";
    var setStr = null;
    var offset = 0;
    var end = 0;
    if (cookie.length > 0) {
        offset = cookie.indexOf(search);
        if (offset != -1) {
            offset += search.length;
            end = cookie.indexOf(";", offset)
            if (end == -1) {
                end = cookie.length;
            }
            setStr = unescape(cookie.substring(offset, end));
        }
    }
    return(setStr);
}


function ifsGetUniqueId() {
    var cookieName = 'ifs_site_uid';
    var uniqueId = ifsGetCookie(cookieName);
    if (!uniqueId) {
        var seed = Math.floor(Math.random() * (new Date).getTime()) % 4000000000; // 32bit max
        uniqueId = seed.toString(16);
    }
    ifsSetCookie(cookieName, uniqueId, "/")
    return uniqueId;
}


function ifsMain() {
	params = 'site='	 + encodeURIComponent(document.location.href) +
			'&title='	 + encodeURIComponent(document.title) +
			'&ref='		 + encodeURIComponent(document.referrer) +
			'&rx='		 + screen.width +
			'&ry='		 + screen.height +
			'&depth='	 + window.screen.colorDepth +
			'&ltime='	 + Math.round(new Date().getTime() / 1000) +
			'&_r='		 + Math.random() +
            '&site_uid=' + ifsGetUniqueId();// +
            //'&sys_uid='  + (ifsGetCookie('ifs_sys_uid') || "");

	_ifs_image = document.createElement('IMG');
	_ifs_image.id = '_ifs_token_img_';
	_ifs_image.src = 'http://ifs1.syn5.com/img.php?' + params;
	_ifs_image.onload = _ifs_process_links;
	document.getElementsByTagName('head')[0].appendChild(_ifs_image);

	var _ifs_check_image = function()
	{
		var oi = document.getElementById('_ifs_token_img_');
	    if(!oi.complete)
	        return;

	    if(typeof oi.naturalWidth != "undefined" && oi.naturalWidth == 0)
	        return;

	    _ifs_process_links();
	}

	setTimeout(_ifs_check_image, 2000);

	var _ifs_links_processed = false;
	function _ifs_process_links()
	{
		var _ifs_hostname = window.location.hostname;
		_ifs_hostname = _ifs_hostname.replace("www.","").toLowerCase();

		if(_ifs_links_processed)
			return;
		_ifs_links_processed = true;

		var elems = document.getElementsByTagName('a');
		for(i = 0; i < elems.length; i++)
		{
			var el = elems[i];
			if(el._ifs_processed)
				continue;
			el._ifs_processed = true;

			// Skip non-html hrefs
			if(el.href.substr(0, 4) != 'http')
				continue;

			// Skip links from same hostname
			var _url_hostname = _ifs_get_hostname(el.href);
			_url_hostname = _url_hostname.replace("www.","").toLowerCase();
			if(_ifs_hostname.indexOf(_url_hostname) != -1)
				continue;

			el.style.backgroundColor = '#c0f0f0';

			el.oncontextmenu = function(){
				_ifs_change_href(this);
			};
			el._ifs_old_mousedown = el.onmousedown || false;
			el.onmousedown = function(evnt){
				if(this._ifs_old_mousedown)
					this._ifs_old_mousedown();

				// http://unixpapa.com/js/mouse.html
				is_ie = true;
				try{
					if (evnt.which != null)
						is_ie = false;
				}
				catch(err){}

				if(is_ie)
			        button = (event.button < 2) ? 'LEFT' :
			        		 ((event.button == 4) ? 'MIDDLE' : 'RIGHT');
				else
			        button = (evnt.which < 2) ? 'LEFT' :
			        		 ((evnt.which == 2) ? 'MIDDLE' : 'RIGHT');

				if(button == 'LEFT')
				{
					var a_target = this.getAttribute('target');
					if(a_target == null || a_target == '')
					{
//						_ifs_change_href(this);
						window.location.href = _ifs_get_new_href(this);
						return false;
					}
				}
				else if(button == 'MIDDLE')
					_ifs_change_href(this);
//					window.location = _ifs_get_new_href(this.href);
			};
			el._ifs_old_onclick = el.onclick || false;
			el.onclick = function(evnt){
				var a_target = this.getAttribute('target');
				if(a_target != null && a_target != '')
				{
					var newwin = window.open(_ifs_get_new_href(this), this.getAttribute('target'));
					newwin.focus();
					return false;
				}
			}
		}
	}


	function _ifs_get_new_href(obj){
		var anchor = obj.innerHTML || '';
		anchor = anchor.replace(/(<([^>]+)>)/ig, '');	// clean HTML tags
		return	'http://ifs1.syn5.com/r.php' +
				'?link='	 + encodeURIComponent(obj.href) +
				'&site='	 + encodeURIComponent(document.location.href) +
				'&ref='		 + encodeURIComponent(document.referrer) +
				'&anchor='	 + encodeURIComponent(anchor) +
				'&ltime='	 + Math.round(new Date().getTime() / 1000) +
                '&site_uid=' + ifsGetUniqueId() +
                '&sys_uid='  + ifsGetCookie('ifs_sys_uid');
	}

	function _ifs_change_href(obj){
		if(!obj._ifs_click_processed){
			old_html = obj.innerHTML;
			obj.href = _ifs_get_new_href(obj);
			obj._ifs_click_processed = true;

			// IE workaround
			if(obj.innerHTML.search('ifs1.syn5.com') != -1)
				obj.innerHTML = old_html;
		}
	}

	function _ifs_get_hostname(href_str){
		var href_reg = new RegExp('^(?:f|ht)tp(?:s)?\://([^/]+)','im');
		try{
			href_return = href_str.match(href_reg)[1].toString();
		}
		catch(err){
			href_return = '';
		}
		return href_return;
	}
}
ifsMain();