/*
 * 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.subobject;

import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.protocol.concepts.IPv4Address;
import org.opendaylight.protocol.pcep.PCEPDeserializerException;
import org.opendaylight.protocol.pcep.concepts.UnnumberedInterfaceIdentifier;
import org.opendaylight.protocol.pcep.subobject.ExcludeRouteSubobject;
import org.opendaylight.protocol.pcep.subobject.XROUnnumberedInterfaceSubobject;
import com.google.common.primitives.UnsignedInts;

/**
 * Parser for
 * {@link org.opendaylight.protocol.pcep.subobject.XROUnnumberedInterfaceSubobject
 * XROUnnumberedInterfaceSubobject}
 */
public class XROUnnumberedInterfaceSubobjectParser {
	public static final int ATTRIBUTE_LENGTH = 1;
	public static final int ROUTER_ID_NUMBER_LENGTH = 4;
	public static final int INTERFACE_ID_NUMBER_LENGTH = 4;

	public static final int ATTRIBUTE_OFFSET = 1;// added reserved field of size 1
	public static final int ROUTER_ID_NUMBER_OFFSET = ATTRIBUTE_OFFSET + ATTRIBUTE_LENGTH;
	public static final int INTERFACE_ID_NUMBER_OFFSET = ROUTER_ID_NUMBER_OFFSET + ROUTER_ID_NUMBER_LENGTH;

	public static final int CONTENT_LENGTH = INTERFACE_ID_NUMBER_OFFSET + INTERFACE_ID_NUMBER_LENGTH;

	public static XROUnnumberedInterfaceSubobject parse(byte[] soContentsBytes, boolean mandatory) throws PCEPDeserializerException {
		if (soContentsBytes == null || soContentsBytes.length == 0)
			throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
		if (soContentsBytes.length != CONTENT_LENGTH)
			throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + soContentsBytes.length + "; Expected: " + CONTENT_LENGTH + ".");

		return new XROUnnumberedInterfaceSubobject(new IPv4Address(
				ByteArray.subByte(soContentsBytes, ROUTER_ID_NUMBER_OFFSET, ROUTER_ID_NUMBER_LENGTH)), new UnnumberedInterfaceIdentifier(
				UnsignedInts.toLong(ByteArray.bytesToInt(ByteArray.subByte(soContentsBytes, INTERFACE_ID_NUMBER_OFFSET, INTERFACE_ID_NUMBER_LENGTH)))),
				mandatory, XROSubobjectAttributeMapping.getInstance().getFromAttributeIdentifier((short) (soContentsBytes[ATTRIBUTE_OFFSET] & 0xFF)));
	}

	public static byte[] put(ExcludeRouteSubobject objToSerialize) {
		if (!(objToSerialize instanceof XROUnnumberedInterfaceSubobject))
			throw new IllegalArgumentException("Unknown PCEPXROSubobject instance. Passed " + objToSerialize.getClass()
					+ ". Needed XROUnnumberedInterfaceSubobject.");

		byte[] retBytes;
		retBytes = new byte[CONTENT_LENGTH];
		final XROUnnumberedInterfaceSubobject specObj = (XROUnnumberedInterfaceSubobject) objToSerialize;

		retBytes[ATTRIBUTE_OFFSET] = (byte) XROSubobjectAttributeMapping.getInstance().getFromAttributeEnum(specObj.getAttribute());
		ByteArray.copyWhole(specObj.getRouterID().getAddress(), retBytes, ROUTER_ID_NUMBER_OFFSET);
		System.arraycopy(ByteArray.longToBytes(specObj.getInterfaceID().getInterfaceId()), Long.SIZE / Byte.SIZE - INTERFACE_ID_NUMBER_LENGTH, retBytes,
				INTERFACE_ID_NUMBER_OFFSET, INTERFACE_ID_NUMBER_LENGTH);

		return retBytes;
	}
}