/*
 *  ******************************************************************************
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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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package org.nd4j.samediff.frameworkimport.onnx.definitions.implementations

import org.nd4j.autodiff.samediff.SDVariable
import org.nd4j.autodiff.samediff.SameDiff
import org.nd4j.autodiff.samediff.internal.SameDiffOp
import org.nd4j.linalg.api.buffer.DataType
import org.nd4j.samediff.frameworkimport.ImportGraph
import org.nd4j.samediff.frameworkimport.hooks.PreImportHook
import org.nd4j.samediff.frameworkimport.hooks.annotations.PreHookRule
import org.nd4j.samediff.frameworkimport.registry.OpMappingRegistry
import org.nd4j.shade.protobuf.GeneratedMessageV3
import org.nd4j.shade.protobuf.ProtocolMessageEnum

/**
 * A port of expand.py from onnx tensorflow for samediff:
 * https://github.com/onnx/onnx-tensorflow/blob/master/onnx_tf/handlers/backend/expand.py
 *
 * @author Adam Gibson
 */
@PreHookRule(nodeNames = [],opNames = ["Expand"],frameworkName = "onnx")
class Expand : PreImportHook  {


    override fun doImport(
        sd: SameDiff,
        attributes: Map<String, Any>,
        outputNames: List<String>,
        op: SameDiffOp,
        mappingRegistry: OpMappingRegistry<GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, ProtocolMessageEnum, GeneratedMessageV3, GeneratedMessageV3>,
        importGraph: ImportGraph<GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, GeneratedMessageV3, ProtocolMessageEnum>,
        dynamicVariables: Map<String, GeneratedMessageV3>
    ): Map<String, List<SDVariable>> {
        var inputVariable = sd.getVariable(op.inputsToOp[0])
        val newShape = sd.getVariable(op.inputsToOp[1])
        val outputVarName = outputNames[0]

        var outputVar: SDVariable = if(inputVariable.dataType() == DataType.BOOL) {
            val ones = sd.create(newShape,DataType.INT8)
            val assignedOnes = ones.assign(1.0)
            val r = sd.castTo(inputVariable,DataType.INT8).mul(assignedOnes)
            sd.castTo(outputVarName,r,DataType.BOOL)
        } else {
            val ones = sd.create(newShape,inputVariable.dataType())
            val assignedOnes = ones.assign(1.0)
            assignedOnes.mul(outputVarName,inputVariable)
        }

        return mapOf(outputVar.name() to listOf(outputVar))
    }


}