var Metrics = Class.create({
	
	serviceUrl : null,
	pageTracker : null,
	
	initialize : function(_serviceUrl) {
		this.serviceUrl = _serviceUrl;
		this.pageTracker = _gat._getTracker('UA-2029055-31');
	},
	
	google : function (to, from) {
		this.pageTracker._trackPageview(to + ' [from: ' + from + ']');
	},

	invite : function (kind) {
		var params = {};
		params[gadgets.io.RequestParameters.CONTENT_TYPE] = gadgets.io.ContentType.TEXT;
		params[gadgets.io.RequestParameters.AUTHORIZATION] = gadgets.io.AuthorizationType.SIGNED;
		params[gadgets.io.RequestParameters.METHOD] = gadgets.io.MethodType.GET;
		 
		 var bellService = this.serviceUrl + 'invite.php?viral_kind=' + kind;
	
		Debug.info('Ringing bell: ' + kind); 
		gadgets.io.makeRequest(bellService, function() { ; }, params);
	},
	
	getHref : function (_appurl, _from) {
		var appParam = { 
			from: _from
		};
		return _appurl + '&appParams=' + escape(Object.toJSON(appParam).replace(/\s/g,''));
	}
});