/*******************************************************************************
 * 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.transforms.bool;

import lombok.NonNull;
import org.nd4j.autodiff.functions.DifferentialFunction;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.BaseTransformBoolOp;
import org.nd4j.linalg.api.ops.BaseTransformOp;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.indexing.conditions.Condition;

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

/**
 * Match condition transform
 *
 * @author raver119@gmail.com
 */
public class MatchConditionTransform extends BaseTransformBoolOp {

    private Condition condition;
    private double compare;
    private double eps;
    private int mode;

    public MatchConditionTransform(SameDiff sameDiff, SDVariable in, Condition condition) {
        super(sameDiff, in, false);
        this.condition = condition;
        this.compare = condition.getValue();
        this.mode = condition.condtionNum();
        this.eps = Nd4j.EPS_THRESHOLD;
        this.extraArgs = new Object[] {compare, eps, (double) mode};
    }

    public MatchConditionTransform() {}

    public MatchConditionTransform(@NonNull INDArray x, @NonNull INDArray z, @NonNull Condition condition) {
        this(x, z, Nd4j.EPS_THRESHOLD, condition);
    }


    public MatchConditionTransform(INDArray x, @NonNull Condition condition) {
        this(x, null, Nd4j.EPS_THRESHOLD, condition);
    }


    public MatchConditionTransform(INDArray x, INDArray z, double eps, @NonNull Condition condition) {
        super(x, null, z);

        this.compare = condition.getValue();
        this.mode = condition.condtionNum();
        this.eps = eps;

        this.extraArgs = new Object[] {compare, eps, (double) mode};
    }

    public MatchConditionTransform(INDArray x, double eps, @NonNull Condition condition) {
        this(x, null, eps, condition);
    }

    @Override
    public int opNum() {
        return 5;
    }

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

    @Override
    public String onnxName() {
        throw new NoOpNameFoundException("No onnx op opName found for " +  opName());
    }

    @Override
    public String tensorflowName() {
        throw new NoOpNameFoundException("No tensorflow op opName found for " +  opName());
    }



    @Override
    public List<SDVariable> doDiff(List<SDVariable> f1) {
        return Collections.singletonList(sameDiff.zerosLike(arg()));
    }
}
