/*
 * 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.impl.object;

import org.opendaylight.protocol.pcep.spi.AbstractObjectWithTlvsParser;
import org.opendaylight.protocol.pcep.spi.ObjectUtil;
import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
import org.opendaylight.protocol.pcep.spi.TlvHandlerRegistry;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Object;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.ObjectHeader;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Tlv;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.CClose;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.CCloseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.c.close.Tlvs;

import com.google.common.primitives.UnsignedBytes;

/**
 * Parser for {@link org.opendaylight.protocol.pcep.object.PCEPCloseObject PCEPCloseObject}
 */
public class PCEPCloseObjectParser extends AbstractObjectWithTlvsParser<CCloseBuilder> {

	public static final int CLASS = 15;

	public static final int TYPE = 1;

	/*
	 * lengths of fields in bytes
	 */
	private static final int FLAGS_F_LENGTH = 1;
	private static final int REASON_F_LENGTH = 1;

	/*
	 * offsets of fields in bytes
	 */
	private static final int FLAGS_F_OFFSET = 2;
	private static final int REASON_F_OFFSET = FLAGS_F_OFFSET + FLAGS_F_LENGTH;

	/*
	 * total size of object in bytes
	 */
	private static final int TLVS_OFFSET = REASON_F_OFFSET + REASON_F_LENGTH;

	public PCEPCloseObjectParser(final TlvHandlerRegistry tlvReg) {
		super(tlvReg);
	}

	@Override
	public CClose parseObject(final ObjectHeader header, final byte[] bytes) throws PCEPDeserializerException {
		if (bytes == null) {
			throw new IllegalArgumentException("Byte array is mandatory.");
		}
		final CCloseBuilder builder = new CCloseBuilder();
		parseTlvs(builder, ByteArray.cutBytes(bytes, TLVS_OFFSET));
		builder.setIgnore(header.isIgnore());
		builder.setProcessingRule(header.isProcessingRule());
		builder.setReason((short) UnsignedBytes.toInt(bytes[REASON_F_OFFSET]));
		return builder.build();
	}

	@Override
	public void addTlv(final CCloseBuilder builder, final Tlv tlv) {
		// No tlvs defined
	}

	@Override
	public byte[] serializeObject(final Object object) {
		if (!(object instanceof CClose)) {
			throw new IllegalArgumentException("Wrong instance of PCEPObject. Passed " + object.getClass() + ". Needed CloseObject.");
		}
		final CClose obj = (CClose) object;

		final byte[] tlvs = serializeTlvs(obj.getTlvs());
		int tlvsLength = 0;
		if (tlvs != null) {
			tlvsLength = tlvs.length;
		}
		final byte[] retBytes = new byte[TLVS_OFFSET + tlvsLength + getPadding(TLVS_OFFSET + tlvs.length, PADDED_TO)];

		if (tlvs != null) {
			ByteArray.copyWhole(tlvs, retBytes, TLVS_OFFSET);
		}
		retBytes[REASON_F_OFFSET] = UnsignedBytes.checkedCast(obj.getReason());
		return ObjectUtil.formatSubobject(TYPE, CLASS, object.isProcessingRule(), object.isIgnore(), retBytes);
	}

	public byte[] serializeTlvs(final Tlvs tlvs) {
		// No tlvs defined
		return new byte[0];
	}

	@Override
	public int getObjectType() {
		return TYPE;
	}

	@Override
	public int getObjectClass() {
		return CLASS;
	}
}