/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

//
// Created by raver119 on 12.02.18.
//

#include <op_boilerplate.h>
#if NOT_EXCLUDED(OP_size_at)

#include <ops/declarable/headers/shape.h>

namespace nd4j {
    namespace ops {
        CUSTOM_OP_IMPL(size_at, 1, 1, false, 0, 1) {
            auto input = INPUT_VARIABLE(0);
            auto output = OUTPUT_VARIABLE(0);

            auto dim = INT_ARG(0);
            if (dim < 0)
                dim += input->rankOf();

            REQUIRE_TRUE(dim < input->rankOf(), 0, "Size_At: Dim can't be higher then input rank")

            output->p(0, input->sizeAt(dim));
            output->syncToDevice();

            return Status::OK();
        }

        DECLARE_SHAPE_FN(size_at) {
            return SHAPELIST(ConstantShapeHelper::getInstance()->scalarShapeInfo(nd4j::DataType::INT64));
        }

        DECLARE_TYPES(size_at) {
            getOpDescriptor()
                    ->setAllowedInputTypes(nd4j::DataType::ANY)
                    ->setAllowedOutputTypes(DataType::INT64)
                    ->allowOverride(true);
        }
    }
}

#endif