/*
* jSwipe - jQuery Plugin
* http://plugins.jquery.com/project/swipe
* 
*
* Copyright (c) 2009 Ryan Scherf (www.ryanscherf.com)
* Licensed under the MIT license
*
* $Date: 2009-07-14 (Tue, 14 Jul 2009) $
* $version: 0.1.2
* 
* This jQuery plugin will only run on devices running Mobile Safari
* on iPhone or iPod Touch devices running iPhone OS 2.0 or later. 
* http://developer.apple.com/iphone/library/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html#//apple_ref/doc/uid/TP40006511-SW5
*/
(function ($) {
    $.fn.swipe = function (options) {

        // Default thresholds & swipe functions
        var defaults = {
            threshold: {
                x: 100,
                y: 5
            },
            swipeLeft: function () { alert('swiped left') },
            swipeRight: function () { alert('swiped right') }
        };

        var options = $.extend(defaults, options);

        if (!this) return false;

        return this.each(function () {

            var me = $(this)

            // Private variables for each element
            var originalCoord = { x: 0, y: 0 }
            var finalCoord = { x: 0, y: 0 }

            // Screen touched, store the original coordinate
            function touchStart(event) {
                //console.log('Starting swipe gesture...')
                originalCoord.x = event.targetTouches[0].pageX
                originalCoord.y = event.targetTouches[0].pageY
            }

            // Store coordinates as finger is swiping
            function touchMove(event) {
                event.preventDefault();
                finalCoord.x = event.targetTouches[0].pageX // Updated X,Y coordinates
                finalCoord.y = event.targetTouches[0].pageY
            }

            // Done Swiping
            // Swipe should only be on X axis, ignore if swipe on Y axis
            // Calculate if the swipe was left or right
            function touchEnd(event) {
                changeX = originalCoord.x - finalCoord.x;

                if (changeX > defaults.threshold.x) {
                    defaults.swipeLeft();
                }
                if (changeX < (defaults.threshold.x * -1)) {
                    defaults.swipeRight();
                }
            }

            // Swipe was started
            function touchStart(event) {
                //console.log('Starting swipe gesture...')
                originalCoord.x = event.targetTouches[0].pageX
                originalCoord.y = event.targetTouches[0].pageY

                finalCoord.x = originalCoord.x
                finalCoord.y = originalCoord.y
            }

            // Swipe was canceled
            function touchCancel(event) {
                //console.log('Canceling swipe gesture...')
            }

            // Add gestures to all swipable areas
            this.addEventListener("touchstart", touchStart, false);
            this.addEventListener("touchmove", touchMove, false);
            this.addEventListener("touchend", touchEnd, false);
            this.addEventListener("touchcancel", touchCancel, false);

        });
    };
})(jQuery);