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

package org.nd4j.linalg.api.ops.impl.layers.convolution;

import lombok.Builder;
import lombok.extern.slf4j.Slf4j;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.DynamicCustomOp;

import java.util.Collections;
import java.util.List;


/**
 * UpsamplingDerivative operation
 */
@Slf4j
public class Upsampling2dDerivative extends DynamicCustomOp {

    protected boolean nchw;
    protected int scaleH;
    protected int scaleW;

    public Upsampling2dDerivative() {}

    public Upsampling2dDerivative(SameDiff sameDiff, SDVariable input, SDVariable gradient, boolean nchw, int scaleH, int scaleW) {
        super(null, sameDiff, new SDVariable[]{input, gradient});

        this.nchw = nchw;
        this.scaleH = scaleH;
        this.scaleW = scaleW;

        addIArgument(scaleH);
        addIArgument(scaleW);
        addIArgument(nchw ? 1 : 0);
    }

    @Override
    public String opName() {
        return "upsampling2d_bp";
    }


    @Override
    public List doDiff(List f1) {
        throw new UnsupportedOperationException("Unable to take derivative of derivative.");
    }

    @Override
    public List calculateOutputDataTypes(List inputDataTypes){
        Preconditions.checkState(inputDataTypes != null && inputDataTypes.size() == 2, "Expected 2 input data type for %s, got %s", getClass(), inputDataTypes);
        return Collections.singletonList(inputDataTypes.get(0));
    }
}