var ITEM_TPL_REORDER_BUTTON =
  '<div data-prevent-scroll="true" class="item-right-edit item-reorder ng-hide">' +
  '</div>';

/**
* @ngdoc directive
* @name ionReorderButton
* @parent ionic.directive:ionItem
* @module ionic
* @restrict E
* Creates a reorder button inside a list item, that is visible when the
* {@link ionic.directive:ionList ionList parent's} `show-reorder` evaluates to true or
* `$ionicListDelegate.showReorder(true)` is called.
*
* Can be dragged to reorder items in the list. Takes any ionicon class.
*
* When an item reorder is complete, the `on-reorder` callback given in the attribute is called
* (see below).
*
* See {@link ionic.directive:ionList} for a complete example.
*
* @usage
*
* ```html
* <ion-list ng-controller="MyCtrl">
*   <ion-item ng-repeat="item in items">
*     Item {{$index}}
*     <ion-reorder-button class="ion-navicon"
*                         on-reorder="moveItem(item, $fromIndex, $toIndex)">
*     </ion-reorder>
*   </ion-item>
* </ion-list>
* ```
* ```js
* function MyCtrl($scope) {
*   $scope.items = [1, 2, 3, 4];
*   $scope.moveItem = function(item, fromIndex, toIndex) {
*     //Move the item in the array
*     $scope.items.splice(fromIndex, 1);
*     $scope.items.splice(toIndex, 0, item);
*   };
* }
* ```
*
* @param {expression=} on-reorder Expression to call when an item is reordered.
* Parameters given: $fromIndex, $toIndex.
*/
IonicModule
.directive('ionReorderButton', ['$animate', function($animate) {
  return {
    restrict: 'E',
    require: ['^ionItem', '^ionList'],
    priority: Number.MAX_VALUE,
    compile: function($element, $attr) {
      $attr.$set('class', ($attr.class || '') + ' button icon button-icon', true);
      $element[0].setAttribute('data-prevent-scroll', true);
      return function($scope, $element, $attr, ctrls) {
        var itemCtrl = ctrls[0];
        var listCtrl = ctrls[1];
        $scope.$onReorder = function(oldIndex, newIndex) {
          $scope.$eval($attr.onReorder, {
            $fromIndex: oldIndex,
            $toIndex: newIndex
          });
        };

        var container = angular.element(ITEM_TPL_REORDER_BUTTON);
        container.append($element);
        itemCtrl.$element.append(container).addClass('item-right-editable');

        if (listCtrl.showReorder()) {
          $animate.removeClass(container, 'ng-hide');
        }
      };
    }
  };
}]);