public function actionImport()
    {
        $result = ['error' => Yii::t('podium/view', 'Error')];

        if (Yii::$app->request->isPost) {
            $drop = Yii::$app->request->post('drop');
            if ($drop !== null) {
                $installation = new Installation();
                if ((is_bool($drop) && $drop) || $drop === 'true') {
                    $result = $installation->nextDrop();
                } else {
                    $result = $installation->nextStep();
                }
            }
        }

        return Json::encode($result);
    }