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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.impl.image;

import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.graphmapper.tf.TFGraphMapper;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.factory.Nd4j;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;

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

/**
 * ResizeBilinear op wrapper
 * @author [email protected]
 */
public class ResizeBilinear extends DynamicCustomOp {
    protected boolean alignCorners = false;

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

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

    @Override
    public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
        TFGraphMapper.getInstance().initFunctionFromProperties(nodeDef.getOp(), this, attributesForNode, nodeDef, graph);

        this.alignCorners = attributesForNode.get("align_corners").getB();
        addArgs();
    }

    protected void addArgs() {
        // to be implemented
        iArguments.clear();
        iArguments.add(alignCorners ? 1L : 0L);
    }

    @Override
    public Map propertiesForFunction() {
        Map ret = new LinkedHashMap<>();
        ret.put("alignCorners", alignCorners);
        return ret;
    }

    @Override
    public List doDiff(List f1) {
        throw new UnsupportedOperationException();
    }

    @Override
    public List calculateOutputDataTypes(List inputDataTypes){
        Preconditions.checkState(inputDataTypes != null && (inputDataTypes.size() == 1 || inputDataTypes.size() == 2),
                "Expected 1 or 2 input datatypes for %s, got %s", getClass(), inputDataTypes);
        if(inputDataTypes.get(0).isFPType())
            return Collections.singletonList(inputDataTypes.get(0));
        return Collections.singletonList(Nd4j.defaultFloatingPointType());
    }
}