/*
 * Copyright (c) 2013 Cisco Systems, 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.protocol.pcep.ietf.initiated00;

import java.util.BitSet;

import org.opendaylight.protocol.pcep.ietf.stateful07.Stateful07StatefulCapabilityTlvParser;
import org.opendaylight.protocol.pcep.impl.tlv.TlvUtil;
import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.crabbe.initiated.rev131126.Stateful1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.crabbe.initiated.rev131126.Stateful1Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.stateful.capability.tlv.Stateful;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.stateful.capability.tlv.StatefulBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Tlv;

/**
 * Parser for {@link Stateful}
 */
public final class CInitiated00StatefulCapabilityTlvParser extends Stateful07StatefulCapabilityTlvParser {

	private static final int I_FLAG_OFFSET = 29;

	@Override
	public Stateful parseTlv(final byte[] buffer) throws PCEPDeserializerException {
		if (buffer == null || buffer.length == 0) {
			throw new IllegalArgumentException("Value bytes array is mandatory. Can't be null or empty.");
		}
		if (buffer.length < FLAGS_F_LENGTH) {
			throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + "; Expected: >= "
					+ FLAGS_F_LENGTH + ".");
		}
		final BitSet flags = ByteArray.bytesToBitSet(ByteArray.subByte(buffer, 0, FLAGS_F_LENGTH));

		final StatefulBuilder sb = new StatefulBuilder();
		sb.setLspUpdateCapability(flags.get(U_FLAG_OFFSET));

		if (flags.get(I_FLAG_OFFSET)) {
			sb.addAugmentation(Stateful1.class, new Stateful1Builder().setInitiation(Boolean.TRUE).build());
		}
		return sb.build();
	}

	@Override
	public byte[] serializeTlv(final Tlv tlv) {
		if (tlv == null) {
			throw new IllegalArgumentException("StatefulCapabilityTlv is mandatory.");
		}
		final Stateful sct = (Stateful) tlv;

		final BitSet flags = new BitSet(FLAGS_F_LENGTH * Byte.SIZE);

		final Stateful1 sfi = sct.getAugmentation(Stateful1.class);
		if (sfi != null) {
			flags.set(I_FLAG_OFFSET, sfi.isInitiation());
		}
		flags.set(U_FLAG_OFFSET, sct.isLspUpdateCapability());
		return TlvUtil.formatTlv(TYPE, ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH));
	}
}