/*
 * 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.deserialization.match;

import io.netty.buffer.ByteBuf;

import org.opendaylight.openflowjava.protocol.api.extensibility.OFDeserializer;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev131002.VlanVidMatchEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev131002.VlanVidMatchEntryBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.MatchField;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.OpenflowBasicClass;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.OxmClassBase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.VlanVid;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.oxm.fields.grouping.MatchEntries;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.oxm.fields.grouping.MatchEntriesBuilder;

/**
 * @author michal.polkorab
 *
 */
public class OxmVlanVidDeserializer extends AbstractOxmMatchEntryDeserializer
        implements OFDeserializer<MatchEntries> {

    @Override
    public MatchEntries deserialize(ByteBuf input) {
        MatchEntriesBuilder builder = processHeader(getOxmClass(), getOxmField(), input);
        addVlanVidAugmentation(input, builder);
        if (builder.isHasMask()) {
            OxmMaskDeserializer.addMaskAugmentation(builder, input, EncodeConstants.SIZE_OF_SHORT_IN_BYTES);
        }
        return builder.build();
    }

    private static void addVlanVidAugmentation(ByteBuf input, MatchEntriesBuilder builder) {
        VlanVidMatchEntryBuilder vlanVidBuilder = new VlanVidMatchEntryBuilder();
        int vidEntryValue = input.readUnsignedShort();
        vlanVidBuilder.setCfiBit((vidEntryValue & (1 << 12)) != 0); // cfi is 13-th bit
        vlanVidBuilder.setVlanVid(vidEntryValue & ((1 << 12) - 1)); // value without 13-th bit
        builder.addAugmentation(VlanVidMatchEntry.class, vlanVidBuilder.build());
    }

    @Override
    protected Class<? extends MatchField> getOxmField() {
        return VlanVid.class;
    }

    @Override
    protected Class<? extends OxmClassBase> getOxmClass() {
        return OpenflowBasicClass.class;
    }
}