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/*
 * Copyright (c) 2014, 2015 Red Hat, 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.openflowjava.nx.codec.action;

import static org.opendaylight.yangtools.yang.common.netty.ByteBufUtils.readUint16;
import static org.opendaylight.yangtools.yang.common.netty.ByteBufUtils.readUint8;

import io.netty.buffer.ByteBuf;
import org.opendaylight.openflowjava.nx.api.NiciraActionDeserializerKey;
import org.opendaylight.openflowjava.nx.api.NiciraActionSerializerKey;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.action.rev150203.actions.grouping.Action;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.action.rev150203.actions.grouping.ActionBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.ofj.aug.nx.action.ActionResubmit;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.ofj.aug.nx.action.ActionResubmitBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.ofj.nx.action.resubmit.grouping.NxActionResubmitBuilder;

/**
 * Codec for the NX_RESUBMIT and NX_RESUBMIT_TABLE.
 */
public class ResubmitCodec extends AbstractActionCodec {

    public static final int LENGTH = 16;
    public static final byte NXAST_RESUBMIT_SUBTYPE = 1;
    public static final byte NXAST_RESUBMIT_TABLE_SUBTYPE = 14;
    public static final NiciraActionSerializerKey SERIALIZER_KEY =
            new NiciraActionSerializerKey(EncodeConstants.OF_VERSION_1_3, ActionResubmit.class);
    public static final NiciraActionDeserializerKey DESERIALIZER_KEY =
            new NiciraActionDeserializerKey(EncodeConstants.OF_VERSION_1_3, NXAST_RESUBMIT_SUBTYPE);
    public static final NiciraActionDeserializerKey TABLE_DESERIALIZER_KEY =
            new NiciraActionDeserializerKey(EncodeConstants.OF_VERSION_1_3, NXAST_RESUBMIT_TABLE_SUBTYPE);

    private static final byte OFP_TABLE_ALL = (byte) 255;
    private static final short OFP_IN_PORT = (short) 0xfff8;
    private static final int PADDING = 3; // nx_action_resubmit : uint8_t pad[3];

    public byte getSubType(final ActionResubmit action) {
        if (action.getNxActionResubmit().getTable() == null
                || action.getNxActionResubmit().getTable().byteValue() == OFP_TABLE_ALL) {
            return NXAST_RESUBMIT_SUBTYPE;
        }
        return NXAST_RESUBMIT_TABLE_SUBTYPE;
    }

    @Override
    public void serialize(final Action input, final ByteBuf outBuffer) {
        byte table = OFP_TABLE_ALL;
        short inPort = OFP_IN_PORT;

        ActionResubmit action = (ActionResubmit) input.getActionChoice();
        serializeHeader(LENGTH, getSubType(action), outBuffer);

        if (action.getNxActionResubmit().getInPort() != null) {
            inPort = action.getNxActionResubmit().getInPort().shortValue();
        }
        if (action.getNxActionResubmit().getTable() != null) {
            table = action.getNxActionResubmit().getTable().byteValue();
        }
        outBuffer.writeShort(inPort);
        outBuffer.writeByte(table);
        outBuffer.writeZero(PADDING);
    }

    @Override
    public Action deserialize(final ByteBuf message) {
        final ActionBuilder actionBuilder = deserializeHeader(message);

        ActionResubmitBuilder builder = new ActionResubmitBuilder()
                .setNxActionResubmit(new NxActionResubmitBuilder()
                    .setInPort(readUint16(message))
                    .setTable(readUint8(message))
                    .build());
        message.skipBytes(PADDING);

        actionBuilder.setActionChoice(builder.build());
        return actionBuilder.build();
    }

}