if (!window.SA) {window.SA = {};}

SA.redirection_mobile = function(configuration) {

	var addTimeToDate = function(msec) {
		var exdate = new Date();
		exdate.setTime(exdate.getTime() + msec);
		return exdate;
	};

	var getQueryValue = function(param) {

		if (!param) {
			return;
		}

		var querystring = document.location.search,
			queryStringArray = querystring && querystring.substring(1).split("&"),
			i = 0,
			length = queryStringArray.length;

		for (; i < length; i++) {
			var token = queryStringArray[i],
				firstPart = token && token.substring(0, token.indexOf("="));
			if (firstPart === param ) {
				return token.substring(token.indexOf("=") + 1, token.length);
			}
		}

	};
				
	var agent = navigator.userAgent.toLowerCase(),
	
		FALSE = "false",
		TRUE = "true",

		config = configuration || {},
		redirection_param = config.redirection_paramName || "mobile_redirect",
		mobile_prefix = config.mobile_prefix || "m",
		mobile_url = config.mobile_url,
		mobile_protocol = config.mobile_scheme ?
			config.mobile_scheme + ":" :
				document.location.protocol,
		host = document.location.host,
		queryValue = getQueryValue(redirection_param),
		mobile_host = mobile_url ||
			(mobile_prefix + "." + 
				(!!host.match(/^www\./i) ?
					host.substring(4) : 
						host)),
		cookie_hours = config.cookie_hours || 1,
		isUAMobile =!!(agent.match(/(iPhone|iPod|blackberry|android 0.5|htc|lg|midp|mmp|mobile|nokia|opera mini|palm|pocket|SCH-I800|xoom|kindle|psp|sgh|smartphone|symbian|treo mini|Playstation Portable|SonyEricsson|Samsung|MobileExplorer|PalmSource|Benq|Windows Phone|Windows Mobile|IEMobile|Windows CE|Nintendo Wii)/i));

	if (document.referrer.indexOf(mobile_host) >= 0 || queryValue === FALSE ) {

		if (window.sessionStorage) {
			window.sessionStorage.setItem(redirection_param, FALSE);
		} else {
			document.cookie = redirection_param + "=" + FALSE + ";expires="+
				addTimeToDate(3600*1000*cookie_hours).toUTCString();
		}
	}

	var isSessionStorage = (window.sessionStorage) ? 
			(window.sessionStorage.getItem(redirection_param) === FALSE) :
				false,

		isCookieSet = document.cookie ? 
			(document.cookie.indexOf(redirection_param) >= 0) :
				false;

	if (isUAMobile && !(isCookieSet || isSessionStorage)) {

		if (config.beforeredirection_callback) {
			if (!config.beforeredirection_callback.call(this)) {
				return;
			}
		}
		
		document.location.href = mobile_protocol + "//" + mobile_host;
	} 
};