/*******************************************************************************
 * 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
 ******************************************************************************/

//
// @author Yurii Shyrma (iuriish@yahoo.com), created on 06.12.2017
//

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

#include <ops/declarable/CustomOperations.h>
#include <ops/declarable/helpers/diag.h>

namespace nd4j {
namespace ops  {

////////////////////////////////////////////////////////////////////////// 
CUSTOM_OP_IMPL(diag, 1, 1, false, 0, 0) {
    auto input  = INPUT_VARIABLE(0);
    auto output = OUTPUT_VARIABLE(0);
    
    // input validation
    REQUIRE_TRUE(input->rankOf() <= 3, 0, "CUSTOM_OP diag: rank of input array must be <= 3 !, but got %i instead", input->rankOf());

    // TODO: still not sure if we really want this
    output->assign(0);

    helpers::diagFunctor(block.launchContext(), input, output);
    
    return Status::OK();
}

DECLARE_SYN(MatrixDiag, diag);


        DECLARE_TYPES(diag) {
            getOpDescriptor()
                    ->setAllowedInputTypes(nd4j::DataType::ANY)
                    ->setSameMode(true);
        }

////////////////////////////////////////////////////////////////////////// 
DECLARE_SHAPE_FN(diag) {
    const Nd4jLong* inputShapeInfo = inputShape->at(0);

    return SHAPELIST(ShapeUtils::evalDiagShapeInfo(inputShapeInfo, block.workspace()));
}


}
}

#endif