/*
 * Copyright 2015-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://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.
 */
package org.springframework.statemachine.kryo;

import java.util.List;
import java.util.Map;

import org.springframework.statemachine.StateMachineContext;
import org.springframework.statemachine.support.DefaultExtendedState;
import org.springframework.statemachine.support.DefaultStateMachineContext;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

/**
 * Kryo {@link Serializer} for {@link StateMachineContext}.
 *
 * @author Janne Valkealahti
 *
 * @param <S> the type of state
 * @param <E> the type of event
 */
public class StateMachineContextSerializer<S, E> extends Serializer<StateMachineContext<S, E>> {

	@Override
	public void write(Kryo kryo, Output output, StateMachineContext<S, E> context) {
		kryo.writeClassAndObject(output, context.getEvent());
		kryo.writeClassAndObject(output, context.getState());
		kryo.writeClassAndObject(output, context.getEventHeaders());
		kryo.writeClassAndObject(output, context.getExtendedState() != null ? context.getExtendedState().getVariables() : null);
		kryo.writeClassAndObject(output, context.getChilds());
		kryo.writeClassAndObject(output, context.getHistoryStates());
		kryo.writeClassAndObject(output, context.getId());
	}

	@SuppressWarnings("unchecked")
	@Override
	public StateMachineContext<S, E> read(Kryo kryo, Input input, Class<StateMachineContext<S, E>> clazz) {
		E event = (E) kryo.readClassAndObject(input);
		S state = (S) kryo.readClassAndObject(input);
		Map<String, Object> eventHeaders = (Map<String, Object>) kryo.readClassAndObject(input);
		Map<Object, Object> variables = (Map<Object, Object>) kryo.readClassAndObject(input);
		List<StateMachineContext<S, E>> childs = (List<StateMachineContext<S, E>>) kryo.readClassAndObject(input);
		Map<S, S> historyStates = (Map<S, S>) kryo.readClassAndObject(input);
		String id = (String) kryo.readClassAndObject(input);
		return new DefaultStateMachineContext<S, E>(childs, state, event, eventHeaders, new DefaultExtendedState(variables), historyStates, id);
	}

}
