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package org.deeplearning4j.earlystopping.saver;

import org.apache.commons.io.FilenameUtils;
import org.deeplearning4j.earlystopping.EarlyStoppingModelSaver;
import org.deeplearning4j.nn.multilayer.MultiLayerNetwork;
import org.deeplearning4j.util.ModelSerializer;

import java.io.IOException;
import java.nio.charset.Charset;

/** Save the best (and latest/most recent) models learned during early stopping training to the local file system.

 * Instances of this class will save 3 files for best (and optionally, latest) models:

 * (a) The network configuration: bestModelConf.json

 * (b) The network parameters: bestModelParams.bin

 * (c) The network updater: bestModelUpdater.bin

 * 

 * NOTE: The model updater is an object that contains the internal state for training features such as AdaGrad, Momentum
 * and RMSProp.

 * The updater is not required to use the network at test time; it is saved in case further training is required.
 * Without saving the updater, any further training would result in the updater being recreated, without the benefit
 * of the history/internal state. This could negatively impact training performance after loading the network.
 *
 * @author Alex Black
 */
public class LocalFileModelSaver implements EarlyStoppingModelSaver {

    private static final String bestFileName = "bestModel.bin";
    private static final String latestFileName = "latestModel.bin";
    private String directory;
    private Charset encoding;

    /**Constructor that uses default character set for configuration (json) encoding
     * @param directory Directory to save networks
     */
    public LocalFileModelSaver(String directory) {
        this(directory, Charset.defaultCharset());
    }

    /**
     * @param directory Directory to save networks
     * @param encoding Character encoding for configuration (json)
     */
    public LocalFileModelSaver(String directory, Charset encoding){
        this.directory = directory;
        this.encoding = encoding;
    }

    @Override
    public void saveBestModel(MultiLayerNetwork net, double score) throws IOException {
        String confOut = FilenameUtils.concat(directory,bestFileName);
        save(net,confOut);
    }

    @Override
    public void saveLatestModel(MultiLayerNetwork net, double score) throws IOException {
        String confOut = FilenameUtils.concat(directory,latestFileName);
        save(net,confOut);
    }

    @Override
    public MultiLayerNetwork getBestModel() throws IOException {
        String confOut = FilenameUtils.concat(directory, bestFileName);
        return load(confOut);
    }

    @Override
    public MultiLayerNetwork getLatestModel() throws IOException {
        String confOut = FilenameUtils.concat(directory, latestFileName);
        return load(confOut);
    }

    private void save(MultiLayerNetwork net, String modelName) throws IOException{
        ModelSerializer.writeModel(net, modelName, true);
    }

    private MultiLayerNetwork load(String modelName) throws IOException {
        MultiLayerNetwork net = ModelSerializer.restoreMultiLayerNetwork(modelName);
        return net;
    }

    @Override
    public String toString(){
        return "LocalFileModelSaver(dir=" + directory + ")";
    }
}