/*!
 * jQuery idleTimer plugin
 * version 0.9.100511
 * 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.
 */

/* updated to fix Chrome setTimeout issue by Zaid Zawaideh */

 // API available in <= v0.8
 /*******************************

 // idleTimer() takes an optional argument that defines the idle timeout
 // timeout is in milliseconds; defaults to 30000
 $.idleTimer(10000);


 $(document).bind("idle.idleTimer", function(){
    // function you want to fire when the user goes idle
 });


 $(document).bind("active.idleTimer", function(){
  // function you want to fire when the user becomes active again
 });

 // pass the string 'destroy' to stop the timer
 $.idleTimer('destroy');

 // you can query if the user is idle or not with data()
 $.data(document,'idleTimer');  // 'idle'  or 'active'

 // you can get time elapsed since user when idle/active
 $.idleTimer('getElapsedTime'); // time since state change in ms

 ********/



 // API available in >= v0.9
 /*************************

 // bind to specific elements, allows for multiple timer instances
 $(elem).idleTimer(timeout|'destroy'|'getElapsedTime');
 $.data(elem,'idleTimer');  // 'idle'  or 'active'

 // if you're using the old $.idleTimer api, you should not do $(document).idleTimer(...)

 // element bound timers will only watch for events inside of them.
 // you may just want page-level activity, in which case you may set up
 //   your timers on document, document.documentElement, and document.body


 ********/

(function($){

$.idleTimer = function(newTimeout, elem){

    // defaults that are to be stored as instance props on the elem

    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 touchstart touchmove'; // activity is one of these events


    elem = elem || document;



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

        // curse you, mozilla setTimeout lateness bug!
        if (typeof myelem === 'number'){
            myelem = undefined;
        }

        var obj = $.data(myelem || elem,'idleTimerObj');

        //toggle the state
        obj.idle = !obj.idle;

        // reset timeout 
        var elapsed = (+new Date()) - obj.olddate;
        obj.olddate = +new Date();

        // handle Chrome always triggering idle after js alert or comfirm popup
        if (obj.idle && (elapsed < timeout)) {
                obj.idle = false;
                clearTimeout($.idleTimer.tId);
                if (enabled)
                  $.idleTimer.tId = setTimeout(toggleIdleState, timeout);
                return;
        }
        
        //fire appropriate event

        // create a custom event, but first, store the new state on the element
        // and then append that string to a namespace
        var event = jQuery.Event( $.data(elem,'idleTimer', obj.idle ? "idle" : "active" )  + '.idleTimer'   );

        // we dont want this to bubble
        event.stopPropagation();
        $(elem).trigger(event);
    },

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

        var obj = $.data(elem,'idleTimerObj');

        //set to disabled
        obj.enabled = false;

        //clear any pending timeouts
        clearTimeout(obj.tId);

        //detach the event handlers
        $(elem).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(){

        var obj = $.data(this,'idleTimerObj');

        //clear any existing timeout
        clearTimeout(obj.tId);



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


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

            //set a new timeout
            obj.tId = setTimeout(toggleIdleState, obj.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
     */


    var obj = $.data(elem,'idleTimerObj') || {};

    obj.olddate = obj.olddate || +new Date();

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

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


    obj.idle    = idle;
    obj.enabled = enabled;
    obj.timeout = timeout;


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

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

    // store our instance on the object
    $.data(elem,'idleTimerObj',obj);



}; // end of $.idleTimer()


// v0.9 API for defining multiple timers.
$.fn.idleTimer = function(newTimeout){
    if(this[0]){
        $.idleTimer(newTimeout,this[0]);
    }

    return this;
};


})(jQuery);