;(function (factory)
{
    if (typeof define === 'function' && define.amd)
    {
        // AMD. Register as an anonymous module.
        define(['jquery'], factory);
    } else if (typeof exports === 'object')
    {
        // Node/CommonJS
        factory(require('jquery'));
    } else
    {
        // Browser globals
        factory(jQuery);
    }
}(function ($)
{
    $.tiny = $.tiny || { };

    $.tiny.scrollbar = {
        options: {
                axis : 'y' // vertical or horizontal scrollbar? ( x || y ).
            , wheel : true // enable or disable the mousewheel;
            , wheelSpeed : 40 // how many pixels must the mouswheel scroll at a time.
            , wheelLock : true // return mouswheel to browser if there is no more content.
            , scrollInvert : false // Enable invert style scrolling
            , trackSize : false // set the size of the scrollbar to auto or a fixed number.
            , thumbSize : false // set the size of the thumb to auto or a fixed number.
        }
    };

    $.fn.tinyscrollbar = function(params)
    {
        var options = $.extend( {}, $.tiny.scrollbar.options, params );

        this.each(function()
        {
            $(this).data('tsb', new Scrollbar( $( this ), options ) );
        });

        return this;
    };

    $.fn.tinyscrollbar_update = function(sScroll)
    {
        return $( this ).data( 'tsb' ).update( sScroll );
    };

    function Scrollbar($container, options)
    {
        var self = this
        , $viewport = $container.find(".viewport")
        , $overview = $container.find(".overview")
        , $scrollbar = $container.find(".scrollbar")
        , $track = $scrollbar.find(".track")
        , $thumb = $scrollbar.find(".thumb")

        , viewportSize = 0
        , contentSize = 0
        , contentPosition = 0
        , contentRatio = 0
        , trackSize = 0
        , trackRatio = 0
        , thumbSize = 0
        , thumbPosition = 0
        , mousePosition = 0

        , isHorizontal = options.axis === 'x'
        , hasTouchEvents = "ontouchstart" in document.documentElement

        , sizeLabel = isHorizontal ? "width" : "height"
        , posiLabel = isHorizontal ? "left" : "top"
        ;

        function initialize()
        {
            self.update();
            setEvents();

            return self;
        }

        this.update = function(scrollTo)
        {
            var sizeLabelCap = sizeLabel.charAt(0).toUpperCase() + sizeLabel.slice(1).toLowerCase();
            viewportSize = $viewport[0]['offset'+ sizeLabelCap];
            contentSize = $overview[0]['scroll'+ sizeLabelCap];
            contentRatio = viewportSize / contentSize;
            trackSize = options.trackSize || viewportSize;
            thumbSize = Math.min(trackSize, Math.max(0, (options.thumbSize || (trackSize * contentRatio))));
            trackRatio = options.thumbSize ? (contentSize - viewportSize) / (trackSize - thumbSize) : (contentSize / trackSize);

            $scrollbar.toggleClass("disable", contentRatio >= 1);

            switch (scrollTo)
            {
                case "bottom":
                    contentPosition = contentSize - viewportSize;
                    break;

                case "relative":
                    contentPosition = Math.min(contentSize - viewportSize, Math.max(0, contentPosition));
                    break;

                default:
                    contentPosition = parseInt(scrollTo, 10) || 0;
            }

            setSize();
        };

        function setSize()
        {
            $thumb.css(posiLabel, contentPosition / trackRatio);
            $overview.css(posiLabel, -contentPosition);
            mousePosition = $thumb.offset()[posiLabel];

            $scrollbar.css(sizeLabel, trackSize);
            $track.css(sizeLabel, trackSize);
            $thumb.css(sizeLabel, thumbSize);
        }

        function setEvents()
        {
            if(hasTouchEvents)
            {
                $viewport[0].ontouchstart = function(event)
                {
                    if(1 === event.touches.length)
                    {
                        start(event.touches[0]);
                        event.stopPropagation();
                    }
                };
            }
            else
            {
                $thumb.bind("mousedown", start);
                $track.bind("mouseup", drag);
            }

            if(options.wheel && window.addEventListener)
            {
                $container[0].addEventListener("DOMMouseScroll", wheel, false );
                $container[0].addEventListener("mousewheel", wheel, false );
            }
            else if(options.wheel)
            {
                $container[0].onmousewheel = wheel;
            }
        }

        function start(event)
        {
            $("body").addClass("noSelect");

            mousePosition = isHorizontal ? event.pageX : event.pageY;
            thumbPosition = parseInt($thumb.css(posiLabel), 10) || 0;

            if(hasTouchEvents)
            {
                document.ontouchmove = function(event)
                {
                    event.preventDefault();
                    drag(event.touches[0]);
                };
                document.ontouchend = end;
            }
            else
            {
                $(document).bind("mousemove", drag);
                $(document).bind("mouseup", end);
                $thumb.bind("mouseup", end);
            }
        }

        function wheel(event)
        {
            if(contentRatio < 1)
            {
                var eventObject = event || window.event
                , wheelSpeedDelta = eventObject.wheelDelta ? eventObject.wheelDelta / 120 : -eventObject.detail / 3
                ;

                contentPosition -= wheelSpeedDelta * options.wheelSpeed;
                contentPosition = Math.min((contentSize - viewportSize), Math.max(0, contentPosition));

                $thumb.css(posiLabel, contentPosition / trackRatio);
                $overview.css(posiLabel, -contentPosition);

                if(options.wheelLock || (contentPosition !== (contentSize - viewportSize) && contentPosition !== 0))
                {
                    eventObject = $.event.fix(eventObject);
                    eventObject.preventDefault();
                }
            }
        }

        function drag( event )
        {
            if(contentRatio < 1)
            {
                var mousePositionNew = isHorizontal ? event.pageX : event.pageY;
                var thumbPositionDelta = mousePositionNew - mousePosition;

                if(options.scrollInvert)
                {
                    thumbPositionDelta = mousePosition - mousePositionNew;
                }

                var thumbPositionNew = Math.min((trackSize - thumbSize), Math.max(0, thumbPosition + thumbPositionDelta));
                contentPosition = thumbPositionNew * trackRatio;

                $thumb.css(posiLabel, thumbPositionNew);
                $overview.css(posiLabel, -contentPosition);
            }
        }

        function end()
        {
            $("body").removeClass("noSelect");
            $(document).unbind("mousemove", drag);
            $(document).unbind("mouseup", end);
            $thumb.unbind("mouseup", end);
            document.ontouchmove = document.ontouchend = null;
        }

        return initialize();
    }
}));