/*!
* jQuery UI Touch Punch 0.1.0
*
* Copyright 2010, Dave Furfero
* Dual licensed under the MIT or GPL Version 2 licenses.
*
* Depends:
* jquery.ui.widget.js
* jquery.ui.mouse.js
*/
(function ($) {

  $.support.touch = typeof Touch === 'object';

  if (!$.support.touch) {
    return;
  }

  var mouseProto = $.ui.mouse.prototype,
      _mouseInit = mouseProto._mouseInit,
      _mouseDown = mouseProto._mouseDown,
      _mouseUp = mouseProto._mouseUp,

      mouseEvents = {
        touchstart: 'mousedown',
        touchmove: 'mousemove',
        touchend: 'mouseup'
      };

  function makeMouseEvent (event) {

    var touch = event.originalEvent.changedTouches[0];

    return $.extend(event, {
      type: mouseEvents[event.type],
      which: 1,
      pageX: touch.pageX,
      pageY: touch.pageY,
      screenX: touch.screenX,
      screenY: touch.screenY,
      clientX: touch.clientX,
      clientY: touch.clientY
    });
  }

  mouseProto._mouseInit = function () {

    var self = this;

    self.element.bind('touchstart.' + self.widgetName, function (event) {
      return self._mouseDown(makeMouseEvent(event));
    });

    _mouseInit.call(self);
  };

  mouseProto._mouseDown = function (event) {

    var self = this,
        ret = _mouseDown.call(self, event);

    self._touchMoveDelegate = function (event) {
      return self._mouseMove(makeMouseEvent(event));
    };
    
    self._touchEndDelegate = function(event) {
      return self._mouseUp(makeMouseEvent(event));
    };

    $(document)
      .bind('touchmove.' + self.widgetName, self._touchMoveDelegate)
      .bind('touchend.' + self.widgetName, self._touchEndDelegate);

    return ret;
  };

  mouseProto._mouseUp = function (event) {

    var self = this;

    $(document)
      .unbind('touchmove.' + self.widgetName, self._touchMoveDelegate)
      .unbind('touchend.' + self.widgetName, self._touchEndDelegate);

    return _mouseUp.call(self, event);
  };

})(jQuery);