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/*
 * Copyright (c) 2018 Red Hat, Inc. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.cluster.raft.persisted;

import static java.util.Objects.requireNonNull;

import akka.actor.ExtendedActorSystem;
import akka.serialization.JSerializer;
import akka.util.ClassLoaderObjectInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.commons.lang3.SerializationUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Specialized serializer for {@link SimpleReplicatedLogEntry} that optimizes serialization.
 *
 * @author Thomas Pantelis
 */
public class SimpleReplicatedLogEntrySerializer extends JSerializer {
    private static final Logger LOG = LoggerFactory.getLogger(SimpleReplicatedLogEntrySerializer.class);

    private final ExtendedActorSystem system;

    public SimpleReplicatedLogEntrySerializer(final ExtendedActorSystem system) {
        this.system = requireNonNull(system);
    }

    @Override
    public int identifier() {
        return 97439500;
    }

    @Override
    public boolean includeManifest() {
        return false;
    }

    @Override
    public byte[] toBinary(final Object obj) {
        if (!(obj instanceof SimpleReplicatedLogEntry replicatedLogEntry)) {
            throw new IllegalArgumentException("Unsupported object type " + obj.getClass());
        }

        final int estimatedSerializedSize = replicatedLogEntry.serializedSize();

        final var baos = new ByteArrayOutputStream(estimatedSerializedSize);
        SerializationUtils.serialize(replicatedLogEntry, baos);
        final byte[] bytes = baos.toByteArray();

        if (LOG.isDebugEnabled()) {
            final var data = replicatedLogEntry.getData();
            LOG.debug("Estimated serialized size {}, data size {} for payload: {}. Actual serialized size: {}",
                estimatedSerializedSize, data.size(), data, bytes.length);
        }

        return bytes;
    }

    @Override
    public Object fromBinaryJava(final byte[] bytes, final Class manifest) {
        try (ClassLoaderObjectInputStream is = new ClassLoaderObjectInputStream(system.dynamicAccess().classLoader(),
                new ByteArrayInputStream(bytes))) {
            return is.readObject();
        } catch (IOException | ClassNotFoundException e) {
            throw new IllegalStateException("Failed to deserialize object", e);
        }
    }
}