/*
 * 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.pcep.impl.object.XROSubobjectUtil;
import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
import org.opendaylight.protocol.pcep.spi.XROSubobjectParser;
import org.opendaylight.protocol.pcep.spi.XROSubobjectSerializer;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.SubobjectsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.ExcludeRouteSubobjects.Attribute;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.SrlgId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.SrlgSubobject;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.SrlgCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.SrlgCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.srlg._case.SrlgBuilder;

import com.google.common.primitives.UnsignedBytes;

/**
 * Parser for {@link SrlgCase}
 */
public class XROSRLGSubobjectParser implements XROSubobjectParser, XROSubobjectSerializer {

	public static final int TYPE = 34;

	private static final int SRLG_ID_NUMBER_LENGTH = 4;
	private static final int ATTRIBUTE_LENGTH = 1;

	private static final int SRLG_ID_NUMBER_OFFSET = 0;
	private static final int ATTRIBUTE_OFFSET = SRLG_ID_NUMBER_OFFSET + SRLG_ID_NUMBER_LENGTH;

	private static final int CONTENT_LENGTH = SRLG_ID_NUMBER_LENGTH + ATTRIBUTE_LENGTH;

	@Override
	public Subobjects parseSubobject(final byte[] buffer, final boolean mandatory) throws PCEPDeserializerException {
		if (buffer == null || buffer.length == 0) {
			throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
		}
		if (buffer.length != CONTENT_LENGTH) {
			throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + "; Expected: "
					+ CONTENT_LENGTH + ".");
		}

		final SubobjectsBuilder builder = new SubobjectsBuilder();
		builder.setMandatory(mandatory);
		builder.setAttribute(Attribute.Srlg);
		builder.setSubobjectType(new SrlgCaseBuilder().setSrlg(
				new SrlgBuilder().setSrlgId(
						new SrlgId(ByteArray.bytesToLong(ByteArray.subByte(buffer, SRLG_ID_NUMBER_OFFSET, SRLG_ID_NUMBER_LENGTH)))).build()).build());
		return builder.build();
	}

	@Override
	public byte[] serializeSubobject(final Subobjects subobject) {
		if (!(subobject.getSubobjectType() instanceof SrlgCase)) {
			throw new IllegalArgumentException("Unknown PCEPXROSubobject instance. Passed " + subobject.getSubobjectType().getClass()
					+ ". Needed SrlgCase.");
		}

		byte[] retBytes;
		retBytes = new byte[CONTENT_LENGTH];
		final SrlgSubobject specObj = ((SrlgCase) subobject.getSubobjectType()).getSrlg();

		ByteArray.copyWhole(ByteArray.longToBytes(specObj.getSrlgId().getValue(), SRLG_ID_NUMBER_LENGTH), retBytes, SRLG_ID_NUMBER_OFFSET);
		retBytes[ATTRIBUTE_OFFSET] = UnsignedBytes.checkedCast(subobject.getAttribute().getIntValue());

		return XROSubobjectUtil.formatSubobject(TYPE, subobject.isMandatory(), retBytes);
	}

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