/*
 *  ******************************************************************************
 *  *
 *  *
 *  * 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.shape.tensorops;

import lombok.NoArgsConstructor;
import lombok.NonNull;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.common.util.ArrayUtil;
import org.nd4j.enums.PartitionMode;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.factory.Nd4j;

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

@NoArgsConstructor
public class EmbeddingLookup extends DynamicCustomOp {
    public EmbeddingLookup(SameDiff sd, SDVariable x, SDVariable[] indices, PartitionMode partitionMode) {
        super(null, sd, ArrayUtil.concat(SDVariable.class,
                new SDVariable[]{x},indices));
        addIArgument(partitionMode.ordinal());

    }
     public EmbeddingLookup(@NonNull SameDiff sameDiff, @NonNull SDVariable in, @NonNull SDVariable indices, PartitionMode partitionMode) {
        super("embedding_lookup", sameDiff, new SDVariable[]{in, indices});
        addIArgument(partitionMode.ordinal());
    }

    public EmbeddingLookup(@NonNull INDArray in, @NonNull INDArray indices, PartitionMode partitionMode, INDArray output) {
        super("embedding_lookup", new INDArray[]{in, indices}, wrapOrNull(output));
        addIArgument(partitionMode.ordinal());

    }

    public EmbeddingLookup(INDArray in,@NonNull INDArray[] indices, PartitionMode partitionMode) {
        super("embedding_lookup", ArrayUtil.concat(INDArray.class,
                new INDArray[]{in},indices), null);
        addIArgument(partitionMode.ordinal());
    }




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

    @Override
    public List<DataType> calculateOutputDataTypes(List<DataType> dataTypes) {
        Preconditions
                .checkArgument(dataTypes != null && dataTypes.size() == 2, "Expected exactly 2 input datatypes, got %s", dataTypes);
        Preconditions.checkArgument(dataTypes.get(0).isFPType(), "Input datatype must be floating point, got %s", dataTypes);
        Preconditions.checkArgument(dataTypes.get(1).isIntType(), "Input datatype must be integer point, got %s", dataTypes);

        return Collections.singletonList(dataTypes.get(0));
    }


}
