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/*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)

 * Licensed under the MIT License (LICENSE.txt).

 *

 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.

 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.

 * Thanks to: Seamus Leahy for adding deltaX and deltaY

 *

 * Version: 3.1.0

 *

 * Requires: 1.2.2+

 */

(function (factory) {

    if (typeof define === 'function' && define.amd) {

        // AMD. Register as an anonymous module.

        define(['jquery'], factory);

    } else {

        // Browser globals

        factory(jQuery);

    }

}(function ($) {

    var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll'];

    var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];

    var lowestDelta, lowestDeltaXY;

    if ($.event.fixHooks) {

        for ( var i=toFix.length; i; ) {

            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;

        }

    }

    $.event.special.mousewheel = {

        setup: function() {

            if ( this.addEventListener ) {

                for ( var i=toBind.length; i; ) {

                    this.addEventListener( toBind[--i], handler, false );

                }

            } else {

                this.onmousewheel = handler;

            }

        },

        teardown: function() {

            if ( this.removeEventListener ) {

                for ( var i=toBind.length; i; ) {

                    this.removeEventListener( toBind[--i], handler, false );

                }

            } else {

                this.onmousewheel = null;

            }

        }

    };

    $.fn.extend({

        mousewheel: function(fn) {

            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");

        },

        unmousewheel: function(fn) {

            return this.unbind("mousewheel", fn);

        }

    });

    function handler(event) {

        var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, deltaX = 0, deltaY = 0, absDelta = 0, absDeltaXY = 0;

        event = $.event.fix(orgEvent);

        event.type = "mousewheel";

        // Old school scrollwheel delta

        if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta;  }

        if ( orgEvent.detail     ) { delta = orgEvent.detail * -1; }

        // New school wheel delta (wheel event)

        if ( orgEvent.deltaY ) {

            deltaY = orgEvent.deltaY * -1;

            delta  = deltaY;

        }

        if ( orgEvent.deltaX ) {

            deltaX = orgEvent.deltaX;

            delta  = deltaX * -1;

        }

        // Webkit

        if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY;      }

        if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }

        absDelta = Math.abs(delta);

        if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }

        absDeltaXY = Math.max( Math.abs(deltaY), Math.abs(deltaX) );

        if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }

        // Add event and delta to the front of the arguments

        args.unshift(event, Math.floor(delta/lowestDelta), Math.floor(deltaX/lowestDeltaXY), Math.floor(deltaY/lowestDeltaXY));

        return ($.event.dispatch || $.event.handle).apply(this, args);

    }

}));