/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.core.internal.serialization;

import static org.mule.runtime.api.i18n.I18nMessageFactory.createStaticMessage;
import static org.mule.runtime.api.util.Preconditions.checkArgument;
import static org.mule.runtime.core.util.IOUtils.toByteArray;
import org.mule.runtime.api.streaming.bytes.CursorStream;
import org.mule.runtime.api.streaming.bytes.CursorStreamProvider;
import org.mule.runtime.core.api.serialization.AbstractSerializationProtocol;
import org.mule.runtime.core.api.serialization.SerializationException;
import org.mule.runtime.core.api.serialization.SerializationProtocol;
import org.mule.runtime.core.util.SerializationUtils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;

/**
 * Implementation of {@link SerializationProtocol} that uses Java's default serialization mechanism. This means
 * that exceptions will come from serializing objects that do not implement {@link Serializable}
 */
public class JavaExternalSerializerProtocol extends AbstractSerializationProtocol {

  /**
   * {@inheritDoc}
   */
  @Override
  public void serialize(Object object, OutputStream out) throws SerializationException {
    if (object instanceof CursorStreamProvider) {
      try (CursorStream cursor = ((CursorStreamProvider) object).openCursor()) {
        doSerialize(toByteArray(cursor), out);
      } catch (IOException e) {
        throw new SerializationException(createStaticMessage("Could not serialize cursor stream"), e);
      }
    } else {
      doSerialize(object, out);
    }
  }

  private void doSerialize(Object object, OutputStream out) {
    validateForSerialization(object);
    SerializationUtils.serialize((Serializable) object, out);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected byte[] doSerialize(Object object) throws Exception {
    //TODO: MULE-11939
    if (object instanceof CursorStreamProvider) {
      try (CursorStream cursor = ((CursorStreamProvider) object).openCursor()) {
        return SerializationUtils.serialize(toByteArray(cursor));
      }
    }
    validateForSerialization(object);
    return SerializationUtils.serialize((Serializable) object);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected <T> T doDeserialize(InputStream inputStream, ClassLoader classLoader) throws Exception {
    checkArgument(inputStream != null, "Cannot deserialize a null stream");
    checkArgument(classLoader != null, "Cannot deserialize with a null classloader");

    return (T) SerializationUtils.deserialize(inputStream, classLoader, muleContext);
  }

  @Override
  protected <T> T postInitialize(T object) {
    // does nothing since SerializationUtils already does this on its own
    return object;
  }

  private void validateForSerialization(Object object) {
    if (object != null && !(object instanceof Serializable)) {
      throw new SerializationException(String.format("Was expecting a Serializable type. %s was found instead",
                                                     object.getClass().getName()));
    }
  }
}