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

package org.nd4j.linalg.api.ops.impl.transforms;

import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.common.base.Preconditions;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;

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

public class HistogramFixedWidth extends DynamicCustomOp {

    public HistogramFixedWidth(SameDiff sameDiff, SDVariable values, SDVariable valuesRange, SDVariable numBins) {
        super(sameDiff, numBins == null ? new SDVariable[]{values, valuesRange} : new SDVariable[]{values, valuesRange, numBins}, false);
    }

    public HistogramFixedWidth() {
        //no-op
    }

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


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

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

    @Override
    public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
        //No op - just need the inputs
    }

    @Override
    public List doDiff(List f1) {
        throw new UnsupportedOperationException("Not supported");
    }

    @Override
    public List calculateOutputDataTypes(List dataTypes){
        //1 or 2 possible: 2 for TF import (fill with specified value
        Preconditions.checkState(dataTypes != null && (dataTypes.size() == 2 || dataTypes.size() == 3),
                "Expected 2 or 3 input datatypes for %s, got %s", getClass(), dataTypes);
        //TODO MAKE CONFIGURABLE
        return Collections.singletonList(DataType.INT);
    }
}