/*
* jQuery idleTimer plugin
* version 0.8.092209
* by Paul Irish. 
*   http://github.com/paulirish/yui-misc/tree/
* MIT license
 
* adapted from YUI idle timer by nzakas:
*   http://github.com/nzakas/yui-misc/
 
 
* Copyright (c) 2009 Nicholas C. Zakas
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

(function ($) {

    $.idleTimer = function f(newTimeout) {

        //$.idleTimer.tId = -1     //timeout ID

        var idle = false,        //indicates if the user is idle
        enabled = true,        //indicates if the idle timer is enabled
        timeout = 30000,        //the amount of time (ms) before the user is considered idle
        events = 'mousemove keydown DOMMouseScroll mousewheel mousedown', // activity is one of these events
        //f.olddate = undefined, // olddate used for getElapsedTime. stored on the function

        /* (intentionally not documented)
        * Toggles the idle state and fires an appropriate event.
        * @return {void}
        */
    toggleIdleState = function () {

        //toggle the state
        idle = !idle;

        // reset timeout counter
        f.olddate = +new Date;

        //fire appropriate event
        $(document).trigger($.data(document, 'idleTimer', idle ? "idle" : "active") + '.idleTimer');
    },

        /**
        * Stops the idle timer. This removes appropriate event handlers
        * and cancels any pending timeouts.
        * @return {void}
        * @method stop
        * @static
        */
    stop = function () {

        //set to disabled
        enabled = false;

        //clear any pending timeouts
        clearTimeout($.idleTimer.tId);

        //detach the event handlers
        $(document).unbind('.idleTimer');
    },


        /* (intentionally not documented)
        * Handles a user event indicating that the user isn't idle.
        * @param {Event} event A DOM2-normalized event object.
        * @return {void}
        */
    handleUserEvent = function () {

        //clear any existing timeout
        clearTimeout($.idleTimer.tId);



        //if the idle timer is enabled
        if (enabled) {


            //if it's idle, that means the user is no longer idle
            if (idle) {
                toggleIdleState();
            }

            //set a new timeout
            $.idleTimer.tId = setTimeout(toggleIdleState, timeout);

        }
    };


        /**
        * Starts the idle timer. This adds appropriate event handlers
        * and starts the first timeout.
        * @param {int} newTimeout (Optional) A new value for the timeout period in ms.
        * @return {void}
        * @method $.idleTimer
        * @static
        */


        f.olddate = f.olddate || +new Date;

        //assign a new timeout if necessary
        if (typeof newTimeout == "number") {
            timeout = newTimeout;
        } else if (newTimeout === 'destroy') {
            stop();
            return this;
        } else if (newTimeout === 'getElapsedTime') {
            return (+new Date) - f.olddate;
        }

        //assign appropriate event handlers
        $(document).bind($.trim((events + ' ').split(' ').join('.idleTimer ')), handleUserEvent);


        //set a timeout to toggle state
        $.idleTimer.tId = setTimeout(toggleIdleState, timeout);

        // assume the user is active for the first x seconds.
        $.data(document, 'idleTimer', "active");




    }; // end of $.idleTimer()



})(jQuery);