/*
 * 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 java.util.BitSet;

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.lspa.object.Lspa;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.lspa.object.LspaBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.AttributeFilter;

import com.google.common.primitives.UnsignedBytes;

/**
 * Parser for {@link Lspa}
 */
public class PCEPLspaObjectParser extends AbstractObjectWithTlvsParser<LspaBuilder> {

	public static final int CLASS = 9;

	public static final int TYPE = 1;

	/*
	 * lengths of fields in bytes
	 */
	private static final int EXC_ANY_F_LENGTH = 4;
	private static final int INC_ANY_F_LENGTH = 4;
	private static final int INC_ALL_F_LENGTH = 4;
	private static final int SET_PRIO_F_LENGTH = 1;
	private static final int HOLD_PRIO_F_LENGTH = 1;
	private static final int FLAGS_F_LENGTH = 1;

	/*
	 * offsets of flags inside flags field in bits
	 */
	private static final int L_FLAG_OFFSET = 7;

	/*
	 * offsets of fields in bytes
	 */
	private static final int EXC_ANY_F_OFFSET = 0;
	private static final int INC_ANY_F_OFFSET = EXC_ANY_F_OFFSET + EXC_ANY_F_LENGTH;
	private static final int INC_ALL_F_OFFSET = INC_ANY_F_OFFSET + INC_ANY_F_LENGTH;
	private static final int SET_PRIO_F_OFFSET = INC_ALL_F_OFFSET + INC_ALL_F_LENGTH;
	private static final int HOLD_PRIO_F_OFFSET = SET_PRIO_F_OFFSET + SET_PRIO_F_LENGTH;
	private static final int FLAGS_F_OFFSET = HOLD_PRIO_F_OFFSET + HOLD_PRIO_F_LENGTH;
	private static final int TLVS_F_OFFSET = FLAGS_F_OFFSET + FLAGS_F_LENGTH + 1;

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

	@Override
	public Lspa parseObject(final ObjectHeader header, final byte[] bytes) throws PCEPDeserializerException {
		if (bytes == null) {
			throw new IllegalArgumentException("Bytes array is mandatory.");
		}
		final BitSet flags = ByteArray.bytesToBitSet(ByteArray.subByte(bytes, FLAGS_F_OFFSET, FLAGS_F_LENGTH));

		final LspaBuilder builder = new LspaBuilder();
		parseTlvs(builder, ByteArray.cutBytes(bytes, TLVS_F_OFFSET));

		builder.setIgnore(header.isIgnore());
		builder.setProcessingRule(header.isProcessingRule());

		builder.setHoldPriority((short) UnsignedBytes.toInt(bytes[HOLD_PRIO_F_OFFSET]));
		builder.setSetupPriority((short) UnsignedBytes.toInt(bytes[SET_PRIO_F_OFFSET]));
		builder.setLocalProtectionDesired(flags.get(L_FLAG_OFFSET));
		builder.setExcludeAny(new AttributeFilter(ByteArray.bytesToLong(ByteArray.subByte(bytes, EXC_ANY_F_OFFSET, EXC_ANY_F_LENGTH))));
		builder.setIncludeAll(new AttributeFilter(ByteArray.bytesToLong(ByteArray.subByte(bytes, INC_ALL_F_OFFSET, INC_ALL_F_LENGTH))));
		builder.setIncludeAny(new AttributeFilter(ByteArray.bytesToLong(ByteArray.subByte(bytes, INC_ANY_F_OFFSET, INC_ANY_F_LENGTH))));
		return builder.build();
	}

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

		final byte[] retBytes = new byte[TLVS_F_OFFSET];

		System.arraycopy(ByteArray.longToBytes(lspaObj.getExcludeAny().getValue(), EXC_ANY_F_LENGTH), 0, retBytes, EXC_ANY_F_OFFSET,
				EXC_ANY_F_LENGTH);
		System.arraycopy(ByteArray.longToBytes(lspaObj.getIncludeAny().getValue(), INC_ANY_F_LENGTH), 0, retBytes, INC_ANY_F_OFFSET,
				INC_ANY_F_LENGTH);
		System.arraycopy(ByteArray.longToBytes(lspaObj.getIncludeAll().getValue(), INC_ALL_F_LENGTH), 0, retBytes, INC_ALL_F_OFFSET,
				INC_ALL_F_LENGTH);
		retBytes[SET_PRIO_F_OFFSET] = UnsignedBytes.checkedCast(lspaObj.getSetupPriority());
		retBytes[HOLD_PRIO_F_OFFSET] = UnsignedBytes.checkedCast(lspaObj.getHoldPriority());

		final BitSet flags = new BitSet(FLAGS_F_LENGTH * Byte.SIZE);
		flags.set(L_FLAG_OFFSET, lspaObj.isLocalProtectionDesired());
		ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH), retBytes, FLAGS_F_OFFSET);
		return ObjectUtil.formatSubobject(TYPE, CLASS, object.isProcessingRule(), object.isIgnore(), retBytes);
	}

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

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