/*
* Kendo UI Complete v2013.3.1119 (http://kendoui.com)
* Copyright 2013 Telerik AD. All rights reserved.
*
* Kendo UI Complete commercial licenses may be obtained at
* https://www.kendoui.com/purchase/license-agreement/kendo-ui-complete-commercial.aspx
* If you do not own a commercial license, this file shall be governed by the trial license terms.
*/
kendo_module({
    id: "touch",
    name: "Touch",
    category: "mobile",
    description: "The kendo Touch widget provides a cross-platform compatible API for handling user-initiated touch events, multi-touch gestures and event sequences (drag, swipe, etc.). ",
    depends: [ "core", "userevents" ]
});

(function($, undefined) {
    var kendo = window.kendo,
        Widget = kendo.ui.Widget,
        proxy = $.proxy,
        abs = Math.abs,
        MAX_DOUBLE_TAP_DISTANCE = 20;

    var Swipe = kendo.Class.extend({
        init: function(element, callback, options) {
            options = $.extend({
                minXDelta: 30,
                maxYDelta: 20,
                maxDuration: 1000
            }, options);

            new kendo.UserEvents(element, {
                surface: options.surface,
                allowSelection: true,

                start: function(e) {
                    if (abs(e.x.velocity) * 2 >= abs(e.y.velocity)) {
                        e.sender.capture();
                    }
                },

                move: function(e) {
                    var touch = e.touch,
                    duration = e.event.timeStamp - touch.startTime,
                    direction = touch.x.initialDelta > 0 ? "right" : "left";

                    if (
                        abs(touch.x.initialDelta) >= options.minXDelta &&
                        abs(touch.y.initialDelta) < options.maxYDelta &&
                    duration < options.maxDuration)
                    {
                        callback({
                            direction: direction,
                            touch: touch,
                            target: touch.target
                        });

                        touch.cancel();
                    }
                }
            });
        }
    });

    var Touch = Widget.extend({
        init: function(element, options) {
            var that = this;

            Widget.fn.init.call(that, element, options);
            options = that.options;

            element = that.element;

            function eventProxy(name) {
                return function(e) {
                    that._triggerTouch(name, e);
                };
            }

            function gestureEventProxy(name) {
                return function(e) {
                    that.trigger(name, { touches: e.touches, distance: e.distance, center: e.center, event: e.event });
                };
            }

            that.events = new kendo.UserEvents(element, {
                filter: options.filter,
                surface: options.surface,
                minHold: options.minHold,
                multiTouch: options.multiTouch,
                allowSelection: true,
                press: eventProxy("touchstart"),
                hold: eventProxy("hold"),
                tap: proxy(that, "_tap"),
                gesturestart: gestureEventProxy("gesturestart"),
                gesturechange: gestureEventProxy("gesturechange"),
                gestureend: gestureEventProxy("gestureend")
            });

            if (options.enableSwipe) {
                that.events.bind("start", proxy(that, "_swipestart"));
                that.events.bind("move", proxy(that, "_swipemove"));
            } else {
                that.events.bind("start", proxy(that, "_dragstart"));
                that.events.bind("move", eventProxy("drag"));
                that.events.bind("end", eventProxy("dragend"));
            }

            kendo.notify(that);
        },

        events: [
            "touchstart",
            "dragstart",
            "drag",
            "dragend",
            "tap",
            "doubletap",
            "hold",
            "swipe",
            "gesturestart",
            "gesturechange",
            "gestureend"
        ],

        options: {
            name: "Touch",
            surface: null,
            global: false,
            multiTouch: false,
            enableSwipe: false,
            minXDelta: 30,
            maxYDelta: 20,
            maxDuration: 1000,
            minHold: 800,
            doubleTapTimeout: 800
        },

        _triggerTouch: function(type, e) {
            this.trigger(type, { touch: e.touch, event: e.event });
        },

        _tap: function(e) {
            var that = this,
                lastTap = that.lastTap,
                touch = e.touch;

            if (lastTap &&
                (touch.endTime - lastTap.endTime < that.options.doubleTapTimeout) &&
                kendo.touchDelta(touch, lastTap).distance < MAX_DOUBLE_TAP_DISTANCE
                ) {

               that._triggerTouch("doubletap", e);
               that.lastTap = null;
            } else {
                that._triggerTouch("tap", e);
                that.lastTap = touch;
            }
        },

        _dragstart: function(e) {
            this._triggerTouch("dragstart", e);
        },

        _swipestart: function(e) {
            if (abs(e.x.velocity) * 2 >= abs(e.y.velocity)) {
                e.sender.capture();
            }
        },

        _swipemove: function(e) {
            var that = this,
                options = that.options,
                touch = e.touch,
                duration = e.event.timeStamp - touch.startTime,
                direction = touch.x.initialDelta > 0 ? "right" : "left";

            if (
                abs(touch.x.initialDelta) >= options.minXDelta &&
                abs(touch.y.initialDelta) < options.maxYDelta &&
                duration < options.maxDuration
                )
            {
                that.trigger("swipe", {
                    direction: direction,
                    touch: e.touch
                });

                touch.cancel();
            }
        }
    });


    window.jQuery.fn.kendoMobileSwipe = function(callback, options) {
        this.each(function() {
            new Swipe(this, callback, options);
        });
    };

    kendo.ui.plugin(Touch);
})(window.kendo.jQuery);
