/*
 * Copyright The WildFly Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package org.wildfly.clustering.marshalling.protostream.time;

import java.io.IOException;
import java.time.Month;
import java.time.MonthDay;

import org.infinispan.protostream.descriptors.WireType;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamMarshaller;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamReader;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamWriter;

/**
 * Marshals {@link MonthDay} instances.
 * @author Paul Ferraro
 */
public class MonthDayMarshaller implements ProtoStreamMarshaller<MonthDay> {

	private static final Month[] MONTHS = Month.values();
	private static final MonthDay DEFAULT = MonthDay.of(Month.JANUARY, 1);

	private static final int MONTH_INDEX = 1;
	private static final int DAY_OF_MONTH_INDEX = 2;

	@Override
	public MonthDay readFrom(ProtoStreamReader reader) throws IOException {
		MonthDay result = DEFAULT;
		while (!reader.isAtEnd()) {
			int tag = reader.readTag();
			int index = WireType.getTagFieldNumber(tag);
			switch (index) {
				case MONTH_INDEX:
					result = result.with(MONTHS[reader.readEnum()]);
					break;
				case DAY_OF_MONTH_INDEX:
					result = result.withDayOfMonth(reader.readUInt32() + 1);
					break;
				default:
					reader.skipField(tag);
			}
		}
		return result;
	}

	@Override
	public void writeTo(ProtoStreamWriter writer, MonthDay value) throws IOException {
		Month month = value.getMonth();
		if (month != DEFAULT.getMonth()) {
			writer.writeEnum(MONTH_INDEX, month.ordinal());
		}
		int dayOfMonth = value.getDayOfMonth();
		if (dayOfMonth != DEFAULT.getDayOfMonth()) {
			writer.writeUInt32(DAY_OF_MONTH_INDEX, dayOfMonth - 1);
		}
	}

	@Override
	public Class<? extends MonthDay> getJavaClass() {
		return MonthDay.class;
	}
}
