/*
 *  ******************************************************************************
 *  *
 *  *
 *  * 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.deeplearning4j.nn.updater;

import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.deeplearning4j.nn.api.Layer;
import org.deeplearning4j.nn.api.Trainable;
import org.deeplearning4j.nn.api.Updater;
import org.deeplearning4j.nn.multilayer.MultiLayerNetwork;
import org.nd4j.linalg.api.ndarray.INDArray;

import java.util.HashMap;

@Getter
@Slf4j
public class MultiLayerUpdater extends BaseMultiLayerUpdater<MultiLayerNetwork> {

    public MultiLayerUpdater(MultiLayerNetwork network) {
        this(network, null);
    }

    public MultiLayerUpdater(MultiLayerNetwork network, INDArray updaterState) {
        super(network, updaterState);

        layersByName = new HashMap<>();
        Layer[] l = network.getLayers();
        for (int i = 0; i < l.length; i++) {
            layersByName.put(String.valueOf(i), l[i]);
        }
    }

    @Override
    protected Trainable[] getOrderedLayers() {
        Layer[] layers = network.getLayers();
        Trainable[] t = new Trainable[layers.length];
        System.arraycopy(layers, 0, t, 0, layers.length);
        return t;
    }

    @Override
    public INDArray getFlattenedGradientsView() {
        if (network.getFlattenedGradients() == null) {
            network.initGradientsView();
        }
        return network.getFlattenedGradients();
    }

    @Override
    protected INDArray getParams() {
        return network.params();
    }

    @Override
    protected boolean isMiniBatch() {
        return network.conf().isMiniBatch();
    }

    @Override
    public Updater clone() {
        return new MultiLayerUpdater(network, null);
    }
}
