/*! swipe plugin for Cycle2;  version: 20121120 */
(function ($) {
    "use strict";

    // this script adds support for touch events.  the logic is lifted from jQuery Mobile.
    // if you have jQuery Mobile installed, you do NOT need this script

    var supportTouch = 'ontouchend' in document;

    $.event.special.swipe = $.event.special.swipe || {
        scrollSupressionThreshold: 10,   // More than this horizontal displacement, and we will suppress scrolling.
        durationThreshold: 1000,         // More time than this, and it isn't a swipe.
        horizontalDistanceThreshold: 30, // Swipe horizontal displacement must be more than this.
        verticalDistanceThreshold: 75,   // Swipe vertical displacement must be less than this.

        setup: function () {
            var $this = $(this);

            $this.bind('touchstart', function (event) {
                var data = event.originalEvent.touches ? event.originalEvent.touches[0] : event;
                var stop, start = {
                    time: (new Date()).getTime(),
                    coords: [data.pageX, data.pageY],
                    origin: $(event.target)
                };

                function moveHandler(event) {
                    if (!start)
                        return;

                    var data = event.originalEvent.touches ? event.originalEvent.touches[0] : event;

                    stop = {
                        time: (new Date()).getTime(),
                        coords: [data.pageX, data.pageY]
                    };

                    // prevent scrolling
                    if (Math.abs(start.coords[0] - stop.coords[0]) > $.event.special.swipe.scrollSupressionThreshold) {
                        event.preventDefault();
                    }
                }

                $this.bind('touchmove', moveHandler)
                .one('touchend', function (event) {
                    $this.unbind('touchmove', moveHandler);

                    if (start && stop) {
                        if (stop.time - start.time < $.event.special.swipe.durationThreshold &&
                                Math.abs(start.coords[0] - stop.coords[0]) > $.event.special.swipe.horizontalDistanceThreshold &&
                                Math.abs(start.coords[1] - stop.coords[1]) < $.event.special.swipe.verticalDistanceThreshold) {

                            start.origin.trigger("swipe")
                                .trigger(start.coords[0] > stop.coords[0] ? "swipeleft" : "swiperight");
                        }
                    }
                    start = stop = undefined;
                });
            });
        }
    };

    $.event.special.swipeleft = $.event.special.swipeleft || {
        setup: function () {
            $(this).bind('swipe', $.noop);
        }
    };
    $.event.special.swiperight = $.event.special.swiperight || $.event.special.swipeleft;

})(jQuery);