/*
 * Copyright (c) 2016 Brocade Communications 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.bgp.l3vpn.unicast.ipv6;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.opendaylight.protocol.bgp.parser.spi.PathIdUtil.NON_PATH_ID;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.util.List;
import org.junit.Test;
import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
import org.opendaylight.protocol.bgp.parser.BGPParsingException;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.LabelStack;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.LabelStackBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.path.attributes.AttributesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.AttributesReachBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.AttributesUnreachBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.MpReachNlri;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.MpReachNlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.mp.reach.nlri.AdvertizedRoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.MpUnreachNlri;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.MpUnreachNlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.mp.unreach.nlri.WithdrawnRoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.Ipv6AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.MplsLabeledVpnSubsequentAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.RouteDistinguisher;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.ipv6.rev180329.l3vpn.ipv6.destination.VpnIpv6DestinationBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.rev180329.l3vpn.ip.destination.type.VpnDestination;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.rev180329.l3vpn.ip.destination.type.VpnDestinationBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.MplsLabel;
import org.opendaylight.yangtools.yang.common.Uint32;

public class VpnIpv6NlriParserTest {

    private static final VpnIpv6NlriParser PARSER = new VpnIpv6NlriParser();

    /* Reach NLRI prefix value.
    *
    * prefix contents:
    * 88          <- length 136
    * 00 16 3     <- labelValue 355
    * 01          <- bottomBit 1
    * 00 01       <- routeDistinguisher Type=1
    * 01 02 03 04 <- routeDistinguisher IPV4=1.2.3.4
    * 01 02       <- routeDistinguisher AS=258
    * 20 01 23 45 56 89 <- prefixType IPV6=2001:2345:5689::/48
    */
    private static final byte[] REACH_NLRI = new byte[] {
        (byte) 0x88,
        (byte) 0x00, (byte) 0x16, (byte) 0x31,
        0, 1, 1, 2, 3, 4, 1, 2,
        (byte) 0x20, (byte) 0x01, (byte) 0x23, (byte) 0x45, (byte) 0x56, (byte) 0x89
    };

    /* Unreach NLRI prefix value.
    *
    * prefix contents:
    * 88          <- length 136
    * 80 00 00    <- labelValue for withdraw
    * 00 01       <- routeDistinguisher Type=1
    * 01 02 03 04 <- routeDistinguisher IPV4=1.2.3.4
    * 01 02       <- routeDistinguisher AS=258
    * 20 01 23 45 56 89 <- prefixType IPV6=2001:2345:5689::/48
    */
    private static final byte[] UNREACH_NLRI = new byte[] {
        (byte) 0x88,
        (byte) 0x80, (byte) 0x00, (byte) 0x00,
        0, 1, 1, 2, 3, 4, 1, 2,
        (byte) 0x20, (byte) 0x01, (byte) 0x23, (byte) 0x45, (byte) 0x56, (byte) 0x89
    };

    static final IpPrefix IPV6PREFIX = new IpPrefix(new Ipv6Prefix("2001:2345:5689::/48"));
    static final List<LabelStack> LABEL_STACK = List.of(
        new LabelStackBuilder().setLabelValue(new MplsLabel(Uint32.valueOf(355))).build());
    static final RouteDistinguisher DISTINGUISHER = RouteDistinguisherUtil.parseRouteDistinguisher("1.2.3.4:258");
    static final VpnDestination IPV6_VPN = new VpnDestinationBuilder().setRouteDistinguisher(DISTINGUISHER)
            .setPrefix(IPV6PREFIX).setLabelStack(LABEL_STACK).setPathId(NON_PATH_ID)
            .build();
    private static final VpnDestination IPV6_VPN_WITHOUT_LABELS = new VpnDestinationBuilder()
            .setRouteDistinguisher(DISTINGUISHER).setPrefix(IPV6PREFIX).build();

    @Test
    public void testMpReachNlri() throws BGPParsingException {
        final MpReachNlriBuilder mpBuilder = new MpReachNlriBuilder()
            .setAfi(Ipv6AddressFamily.VALUE)
            .setSafi(MplsLabeledVpnSubsequentAddressFamily.VALUE)
            .setAdvertizedRoutes(new AdvertizedRoutesBuilder()
                .setDestinationType(new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.ipv6
                    .rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type
                    .DestinationVpnIpv6CaseBuilder()
                        .setVpnIpv6Destination(new VpnIpv6DestinationBuilder()
                            .setVpnDestination(List.of(new VpnDestinationBuilder(IPV6_VPN).setPathId(null).build()))
                            .build())
                        .build())
                .build());

        final MpReachNlri mpReachExpected = mpBuilder.build();

        final MpReachNlriBuilder testBuilder = new MpReachNlriBuilder()
            .setAfi(Ipv6AddressFamily.VALUE)
            .setSafi(MplsLabeledVpnSubsequentAddressFamily.VALUE);
        PARSER.parseNlri(Unpooled.copiedBuffer(REACH_NLRI), testBuilder, null);
        assertEquals(mpReachExpected, testBuilder.build());

        final ByteBuf output = Unpooled.buffer();
        PARSER.serializeAttribute(new AttributesBuilder()
            .addAugmentation(new AttributesReachBuilder().setMpReachNlri(mpReachExpected).build())
            .build(), output);
        assertArrayEquals(REACH_NLRI, ByteArray.readAllBytes(output));
    }

    @Test
    public void testMpUnreachNlri() throws BGPParsingException {
        final MpUnreachNlriBuilder mpBuilder = new MpUnreachNlriBuilder()
            .setAfi(Ipv6AddressFamily.VALUE)
            .setSafi(MplsLabeledVpnSubsequentAddressFamily.VALUE)
            .setWithdrawnRoutes(new WithdrawnRoutesBuilder()
                .setDestinationType(new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.ipv6
                    .rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type
                    .DestinationVpnIpv6CaseBuilder()
                        .setVpnIpv6Destination(new VpnIpv6DestinationBuilder()
                            .setVpnDestination(List.of(IPV6_VPN_WITHOUT_LABELS))
                            .build())
                        .build())
                .build());
        final MpUnreachNlri mpUnreachExpected1 = mpBuilder.build();

        mpBuilder.setWithdrawnRoutes(new WithdrawnRoutesBuilder()
            .setDestinationType(new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.ipv6
                .rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type
                .DestinationVpnIpv6CaseBuilder()
                    .setVpnIpv6Destination(new VpnIpv6DestinationBuilder()
                        .setVpnDestination(List.of(IPV6_VPN))
                        .build())
                    .build())
            .build());
        final MpUnreachNlri mpUnreachExpected2 = mpBuilder.build();

        final MpUnreachNlriBuilder testBuilder = new MpUnreachNlriBuilder()
            .setAfi(Ipv6AddressFamily.VALUE)
            .setSafi(MplsLabeledVpnSubsequentAddressFamily.VALUE);
        PARSER.parseNlri(Unpooled.copiedBuffer(UNREACH_NLRI), testBuilder, null);
        assertEquals(mpUnreachExpected1, testBuilder.build());

        final ByteBuf output = Unpooled.buffer();
        PARSER.serializeAttribute(new AttributesBuilder()
            .addAugmentation(new AttributesUnreachBuilder().setMpUnreachNlri(mpUnreachExpected2).build())
            .build(), output);
        assertArrayEquals(UNREACH_NLRI, ByteArray.readAllBytes(output));
    }
}