/* jQuery Session vars v.0.4
* by Jay Salvat
* http://www.jaysalvat.com
* -----------------------------------------------
* Inspired by an idea from Mario Heiderich
* http://code.google.com/p/quipt/
* -----------------------------------------------
* Requires jquery.json.js by DeadWisdom
* http://code.google.com/p/jquery-json/
* -----------------------------------------------
* CHANGELOG
* 0.4 -- 13-AUG-08
* sessionKill() added
* 0.3 -- 11-JUL-08
* Security improvements
* Calling manually sessionStart and sessionStop is not required anymore
* Window.name is keept between pages
* 0.2 -- 10-JUL-08
* Now works with functions, objects and arrays
* 0.1 -- 08-JUL-08
* First draft
* -----------------------------------------------
* USAGE
* - To Store
* 	$.session("myVar, "value");
* 
* - To Read
* 	alert( $.session("myVar) ); 	
*/
(function($) {
	var sessionData 	= {};
	var windowName 		= '';
	var domain 			= location.href.match(/\w+:\/\/[^\/]+/)[0];
	var referrer 		= (document.referrer) ? document.referrer.match(/\w+:\/\/[^\/]+/)[0] : '';
	var token			= '##JQS:'+domain+'##';
	
	if(referrer !== domain) {
		window.name = window.name.replace(/#JQS:(.*)/, '');
	}
		
	function loadData() {
		stored = window.name.split(token);
		windowName = window.name = stored[0];
		if (data = stored[1]) {	
			$.each(data.split(';'), function(i, data) {
						parts 		= data.split('=');
						varName 	= parts[0];
						varValue 	= unescape(parts[1]);
						sessionData[varName] = varValue;
			});
		}
	}
	
	function saveData() {
		var dataToStore = windowName+token;
		$.each(sessionData, function(varName, varValue) {		
				if (varName && varValue) {
					dataToStore += ( varName + '=' + escape( varValue ) + ';' );
				}
		});
		window.name = dataToStore;
	}
	
	$.session = function(name, value) {
		if (value) {
			if ($.isFunction(value)) {
				value = value();
			}
			if ( typeof $.toJSON == 'function' ) {
				sessionData[name] = $.toJSON(value);
			} else {
				sessionData[name] = value;
			}
		} else {
			if ( typeof $.evalJSON == 'function' ) {
				return $.evalJSON(sessionData[name]);
			} else {
				return sessionData[name];
			}
		}
	}
	
	$.sessionStop = function() {
		saveData();
	}		
	
	$.sessionStart = function() {
		loadData();
	}

	$.sessionKill = function() {
		sessionData = {};
		window.name = windowName;
	}

	$.sessionStart();
	window.onunload = function() { $.sessionStop(); };
	
})(jQuery);