/* 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);