/*
 *  ******************************************************************************
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 *  *
 *  * 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.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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.
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 *  * SPDX-License-Identifier: Apache-2.0
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package org.nd4j.linalg.api.ops.impl.loss;

import lombok.NoArgsConstructor;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.api.ops.impl.loss.bp.SoftmaxCrossEntropyWithLogitsLossBp;

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


@NoArgsConstructor
public class SoftmaxCrossEntropyWithLogitsLoss extends DynamicCustomOp {

    protected int classesDim;

//    public SoftmaxCrossEntropyWithLogitsLoss(SameDiff sameDiff, SDVariable logits, SDVariable weights, SDVariable labels, int classesDim) {
//        super(null, sameDiff, new SDVariable[]{logits, weights, labels}, false);
//        this.classesDim = classesDim;
//        addIArgument(classesDim);
//    }

    public SoftmaxCrossEntropyWithLogitsLoss(SameDiff sameDiff, SDVariable logits, SDVariable labels, int classesDim) {
        super(null, sameDiff, new SDVariable[]{logits, labels}, false);
        this.classesDim = classesDim;
        addIArgument(classesDim);
    }

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

    @Override
    public String tensorflowName() {
        return "SoftmaxCrossEntropyWithLogits";
    }

    @Override
    public List<DataType> calculateOutputDataTypes(List<DataType> inputDataTypes){
        Preconditions.checkState(inputDataTypes != null && (inputDataTypes.size() == 2 || inputDataTypes.size() == 3),
                "Expected 2 or 3 input datatypes for %s, got %s", getClass(), inputDataTypes);

        return Collections.singletonList(inputDataTypes.get(0));    //Same as predictions
    }

    @Override
    public List<SDVariable> doDiff(List<SDVariable> grad) {
        //No external gradient
        //Args: logits, weights, label
        return new SoftmaxCrossEntropyWithLogitsLossBp(sameDiff, arg(0), arg(1), classesDim).outputs();
    }

    @Override
    public void setPropertiesForFunction(Map<String, Object> properties) {
        if(properties.containsKey("classesDim")) {
            Long dim = (Long) properties.get("classesDim");
            this.classesDim = dim.intValue();
        }
    }
}
