// noprotect

​

var statusWindow = document.getElementById('status');

​

(function (win)

{

    //Private variables

    var _LOCALSTORAGE_KEY = 'WINDOW_VALIDATION';

    var RECHECK_WINDOW_DELAY_MS = 100;

    var _initialized = false;

    var _isMainWindow = false;

    var _unloaded = false;

    var _windowArray;

    var _windowId;

    var _isNewWindowPromotedToMain = false;

    var _onWindowUpdated;

​

    function WindowStateManager(isNewWindowPromotedToMain, onWindowUpdated)

    {

        //this.resetWindows();

        _onWindowUpdated = onWindowUpdated;

        _isNewWindowPromotedToMain = isNewWindowPromotedToMain;

        _windowId = Date.now().toString();

​

        bindUnload();

​

        determineWindowState.call(this);

​

        _initialized = true;

​

        _onWindowUpdated.call(this);

    }

​

    //Determine the state of the window 

    //If its a main or child window

    function determineWindowState()

    {

        var self = this;

        var _previousState = _isMainWindow;

​

        _windowArray = localStorage.getItem(_LOCALSTORAGE_KEY);

​

        if (_windowArray === null || _windowArray === "NaN")

        {

            _windowArray = [];

        }

        else

        {

            _windowArray = JSON.parse(_windowArray);

        }

​

        if (_initialized)

        {

            //Determine if this window should be promoted

            if (_windowArray.length <= 1 ||

               (_isNewWindowPromotedToMain ? _windowArray[_windowArray.length - 1] : _windowArray[0]) === _windowId)

            {

                _isMainWindow = true;

            }

            else

            {

                _isMainWindow = false;

            }

        }

        else

        {

            if (_windowArray.length === 0)

            {

                _isMainWindow = true;

                _windowArray[0] = _windowId;

                localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(_windowArray));

            }

            else

            {

                _isMainWindow = false;

                _windowArray.push(_windowId);

                localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(_windowArray));

            }

        }

​

        //If the window state has been updated invoke callback

        if (_previousState !== _isMainWindow)

        {

            _onWindowUpdated.call(this);

        }

​

        //Perform a recheck of the window on a delay

        setTimeout(function()

                   {

                     determineWindowState.call(self);

                   }, RECHECK_WINDOW_DELAY_MS);

    }

​

    //Remove the window from the global count

    function removeWindow()

    {

        var __windowArray = JSON.parse(localStorage.getItem(_LOCALSTORAGE_KEY));

        for (var i = 0, length = __windowArray.length; i < length; i++)

        {

            if (__windowArray[i] === _windowId)

            {

                __windowArray.splice(i, 1);

                break;

            }

        }

        //Update the local storage with the new array

        localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(__windowArray));

    }

​

    //Bind unloading events  

    function bindUnload()

    {

        win.addEventListener('beforeunload', function ()

        {

            if (!_unloaded)

            {

                removeWindow();

            }

        });

        win.addEventListener('unload', function ()

        {

            if (!_unloaded)

            {

                removeWindow();

            }

        });

    }

​

    WindowStateManager.prototype.isMainWindow = function ()

    {

        return _isMainWindow;

    };

​

    WindowStateManager.prototype.resetWindows = function ()

    {

        localStorage.removeItem(_LOCALSTORAGE_KEY);

    };

​

    win.WindowStateManager = WindowStateManager;

})(window);

​

var WindowStateManager = new WindowStateManager(true, windowUpdated);

​

function windowUpdated()

{

    //"this" is a reference to the WindowStateManager

    statusWindow.className = (this.isMainWindow() ? 'main' : 'child');

}

//Resets the count in case something goes wrong in code

//WindowStateManager.resetWindows()

​

​

​