/**
 * Copyright (c) 2016 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.openflowjava.nx.codec.match;

import static org.junit.Assert.assertEquals;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import org.junit.Before;
import org.junit.Test;
import org.opendaylight.openflowjava.protocol.api.util.OxmMatchConstants;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Nxm0Class;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entries.grouping.MatchEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entries.grouping.MatchEntryBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.NxmOfArpOp;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.ofj.nxm.of.match.arp.op.grouping.ArpOpValuesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.oxm.container.match.entry.value.ArpOpCaseValue;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.oxm.container.match.entry.value.ArpOpCaseValueBuilder;

public class ArpOpCodecTest {

    ArpOpCodec arpOpCodec;
    ByteBuf buffer;
    MatchEntry input;

    private static final int NXM_FIELD_CODE = 15;
    private static final int VALUE_LENGTH = 2;


    @Before
    public void setUp() {
        arpOpCodec = new ArpOpCodec();
        buffer = ByteBufAllocator.DEFAULT.buffer();
    }

    @Test
    public void serializeTest() {
        input = createMatchEntry();
        arpOpCodec.serialize(input, buffer);

        assertEquals(OxmMatchConstants.NXM_0_CLASS, buffer.readUnsignedShort());
        short fieldMask = buffer.readUnsignedByte();
        assertEquals(NXM_FIELD_CODE, fieldMask >> 1);
        assertEquals(0, fieldMask & 1);
        assertEquals(VALUE_LENGTH, buffer.readUnsignedByte());
        assertEquals(1, buffer.readUnsignedShort());
    }

    @Test
    public void deserializeTest() {
        createBuffer(buffer);

        input = arpOpCodec.deserialize(buffer);

        ArpOpCaseValue result = ((ArpOpCaseValue) input.getMatchEntryValue());

        assertEquals(Nxm0Class.class, input.getOxmClass());
        assertEquals(NxmOfArpOp.class, input.getOxmMatchField());
        assertEquals(false, input.isHasMask());
        assertEquals(2, result.getArpOpValues().getValue().shortValue());
    }




    private MatchEntry createMatchEntry() {
        MatchEntryBuilder matchEntryBuilder = new MatchEntryBuilder();
        ArpOpCaseValueBuilder caseBuilder = new ArpOpCaseValueBuilder();
        ArpOpValuesBuilder valuesBuilder = new ArpOpValuesBuilder();

        matchEntryBuilder.setOxmClass(Nxm0Class.class);
        matchEntryBuilder.setOxmMatchField(NxmOfArpOp.class);
        matchEntryBuilder.setHasMask(false);

        valuesBuilder.setValue(1);

        caseBuilder.setArpOpValues(valuesBuilder.build());
        matchEntryBuilder.setMatchEntryValue(caseBuilder.build());
        return matchEntryBuilder.build();
    }

    private void createBuffer(ByteBuf message) {
        message.writeShort(OxmMatchConstants.NXM_0_CLASS);

        int fieldMask = (NXM_FIELD_CODE << 1);
        message.writeByte(fieldMask);
        message.writeByte(VALUE_LENGTH);
        message.writeShort(2);
    }

}