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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;

import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.shape.LongShapeDescriptor;
import org.nd4j.linalg.api.shape.Shape;
import org.nd4j.linalg.exception.ND4JIllegalStateException;
import org.nd4j.linalg.util.ArrayUtil;
import org.nd4j.linalg.util.LinAlgExceptions;

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

/**
 * A base op for basic getters and setters
 *
 * @author Adam Gibson
 */
@Slf4j
public abstract class BaseTransformOp extends BaseOp implements TransformOp {


    public BaseTransformOp(SameDiff sameDiff,
                           SDVariable i_v1,
                           SDVariable i_v2) {
        this(sameDiff,i_v1,i_v2,false);
    }

    public BaseTransformOp(SameDiff sameDiff,
                           SDVariable i_v1,
                           SDVariable i_v2,
                           boolean inPlace) {
        super(sameDiff,inPlace,new Object[] {i_v2});
        if (i_v1 != null && i_v2 != null) {
            f().validateDifferentialFunctionsameDiff(i_v1);
            f().validateDifferentialFunctionsameDiff(i_v2);
            this.sameDiff = sameDiff;
            this.inPlace = inPlace;
            this.xVertexId = i_v1.name();
            this.yVertexId = i_v2.name();
            sameDiff.addArgsFor(new SDVariable[]{i_v1,i_v2},this);
        } else {
            throw new IllegalArgumentException("Input not null variables.");
        }


    }

    public BaseTransformOp(SameDiff sameDiff) {
        this.sameDiff = sameDiff;
    }

    public BaseTransformOp(SameDiff sameDiff,
                           SDVariable i_v1,
                           SDVariable i_v2,
                           Object[] extraArgs) {
        super(sameDiff,extraArgs);
        if (i_v1 != null && i_v2 != null) {

            f().validateDifferentialFunctionsameDiff(i_v1);
            f().validateDifferentialFunctionsameDiff(i_v2);
            this.sameDiff = sameDiff;
            this.xVertexId = i_v1.name();
            this.yVertexId = i_v2.name();
            sameDiff.addArgsFor(new SDVariable[]{i_v1,i_v2},this);
        } else {
            throw new IllegalArgumentException("Input not null variables.");
        }

    }




    public BaseTransformOp(SameDiff sameDiff,SDVariable i_v,boolean inPlace) {
        this(sameDiff,i_v,i_v.getShape(),inPlace,null);
    }

    public BaseTransformOp(SameDiff sameDiff,
                           SDVariable i_v,
                           long[] shape,
                           boolean inPlace,
                           Object[] extraArgs) {
        super(sameDiff,inPlace,extraArgs);

        if (i_v != null) {
            f().validateDifferentialFunctionsameDiff(i_v);
            this.xVertexId = i_v.name();
            sameDiff.addArgsFor(new SDVariable[]{i_v},this);
        } else {
            throw new IllegalArgumentException("Input must not null variable.");
        }

    }


    public BaseTransformOp(SameDiff sameDiff,
                           SDVariable i_v,
                           Object[] extraArgs) {
        this(sameDiff,i_v,i_v.getShape(),false,extraArgs);
    }



    public BaseTransformOp(INDArray x, INDArray z) {
        super(x, z);
        LinAlgExceptions.assertSameShape(x, z);
    }

    public BaseTransformOp() {}

    public BaseTransformOp(INDArray x, INDArray y, INDArray z) {
        super(x, y, z);
        if (y != null)
            LinAlgExceptions.assertSameLength(x, y, z);
        else if (z != null)
            LinAlgExceptions.assertSameLength(x, z);

    }

    public BaseTransformOp(INDArray x) {
        super(x);
    }

    public abstract List calculateOutputShape();


    @Override
    public INDArray z() {
        return z;
    }


}




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