/*
 * Copyright (c) 2013 Pantheon Technologies s.r.o. 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.openflowjava.protocol.impl.util;

import io.netty.buffer.ByteBuf;
import org.opendaylight.openflowjava.protocol.api.extensibility.OFSerializer;
import org.opendaylight.openflowjava.util.ByteBufUtils;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.IetfYangUtil;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.FlowWildcardsV10;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.v10.grouping.MatchV10;

/**
 * Serializes ofp_match (OpenFlow v1.0) structure.
 *
 * @author michal.polkorab
 */
public class OF10MatchSerializer implements OFSerializer<MatchV10> {
    private static final byte PADDING_IN_MATCH = 1;
    private static final byte PADDING_IN_MATCH_2 = 2;
    private static final byte NW_SRC_SHIFT = 8;
    private static final byte NW_DST_SHIFT = 14;

    /**
     * Serializes ofp_match (OpenFlow v1.0).
     *
     * @param outBuffer output ByteBuf
     * @param match match to be serialized
     */
    @Override
    public void serialize(final MatchV10 match, final ByteBuf outBuffer) {
        outBuffer.writeInt(encodeWildcards(match.getWildcards(), match.getNwSrcMask().toJava(),
                    match.getNwDstMask().toJava()));
        outBuffer.writeShort(match.getInPort().toJava());
        outBuffer.writeBytes(IetfYangUtil.macAddressBytes(match.getDlSrc()));
        outBuffer.writeBytes(IetfYangUtil.macAddressBytes(match.getDlDst()));
        outBuffer.writeShort(match.getDlVlan().toJava());
        outBuffer.writeByte(match.getDlVlanPcp().toJava());
        outBuffer.writeZero(PADDING_IN_MATCH);
        outBuffer.writeShort(match.getDlType().toJava());
        outBuffer.writeByte(match.getNwTos().toJava());
        outBuffer.writeByte(match.getNwProto().toJava());
        outBuffer.writeZero(PADDING_IN_MATCH_2);
        outBuffer.writeBytes(IetfInetUtil.ipv4AddressBytes(match.getNwSrc()));
        outBuffer.writeBytes(IetfInetUtil.ipv4AddressBytes(match.getNwDst()));
        outBuffer.writeShort(match.getTpSrc().toJava());
        outBuffer.writeShort(match.getTpDst().toJava());
    }

    private static int encodeWildcards(final FlowWildcardsV10 wildcards, final short srcMask, final short dstMask) {
        int bitmask = ByteBufUtils.fillBitMask(0,
                wildcards.getINPORT(),
                wildcards.getDLVLAN(),
                wildcards.getDLSRC(),
                wildcards.getDLDST(),
                wildcards.getDLTYPE(),
                wildcards.getNWPROTO(),
                wildcards.getTPSRC(),
                wildcards.getTPDST());
        bitmask |= ByteBufUtils.fillBitMask(20,
                wildcards.getDLVLANPCP(),
                wildcards.getNWTOS());
        bitmask |= 32 - srcMask << NW_SRC_SHIFT;
        bitmask |= 32 - dstMask << NW_DST_SHIFT;
        return bitmask;
    }
}