/*
 * Copyright (c) 2015 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.protocol.bgp.linkstate;


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

import com.google.common.collect.ImmutableSet;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.math.BigInteger;
import java.util.Collection;
import java.util.Collections;
import org.junit.Assert;
import org.junit.Test;
import org.opendaylight.protocol.bgp.linkstate.impl.BGPActivator;
import org.opendaylight.protocol.bgp.linkstate.impl.LinkstateRIBSupport;
import org.opendaylight.protocol.bgp.linkstate.impl.nlri.LinkstateNlriParser;
import org.opendaylight.protocol.bgp.linkstate.spi.pojo.SimpleNlriTypeRegistry;
import org.opendaylight.protocol.bgp.parser.spi.BGPExtensionProviderContext;
import org.opendaylight.protocol.bgp.parser.spi.pojo.SimpleBGPExtensionProviderContext;
import org.opendaylight.protocol.bgp.rib.spi.AbstractRIBSupportTest;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.AreaIdentifier;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.DomainIdentifier;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.Identifier;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.LinkstateAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.LinkstateSubsequentAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ProtocolId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.RouteDistinguisher;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.bgp.rib.rib.loc.rib.tables.routes.LinkstateRoutesCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.bgp.rib.rib.loc.rib.tables.routes.LinkstateRoutesCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.isis.lan.identifier.IsIsRouterIdentifierBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.destination.CLinkstateDestination;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.destination.CLinkstateDestinationBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.NodeCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.NodeCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.node._case.NodeDescriptorsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.routes.LinkstateRoutes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.routes.LinkstateRoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.routes.linkstate.routes.LinkstateRoute;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.routes.linkstate.routes.LinkstateRouteBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.routes.linkstate.routes.LinkstateRouteKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.node.identifier.c.router.identifier.IsisPseudonodeCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.node.identifier.c.router.identifier.isis.pseudonode._case.IsisPseudonodeBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLinkstateCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLinkstateCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.reach.nlri.advertized.routes.destination.type.destination.linkstate._case.DestinationLinkstateBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.AttributesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes2;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.tables.Routes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.IsoSystemIdentifier;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;

public final class LinkstateRIBSupportTest extends AbstractRIBSupportTest {

    private static final LinkstateRIBSupport RIB_SUPPORT = LinkstateRIBSupport.getInstance();
    private static final LinkstateRoute ROUTE;
    private static final LinkstateRoutes ROUTES;
    private static final LinkstateRouteKey ROUTE_KEY;

    private static final NodeCase OBJECT_TYPE2 = new NodeCaseBuilder().setNodeDescriptors(new NodeDescriptorsBuilder()
        .setAreaId(new AreaIdentifier(2697513L)).setAsNumber(new AsNumber(72L)).setCRouterIdentifier(new IsisPseudonodeCaseBuilder()
            .setIsisPseudonode(new IsisPseudonodeBuilder().setIsIsRouterIdentifier(new IsIsRouterIdentifierBuilder()
                .setIsoSystemId(new IsoSystemIdentifier(new byte[]{0, 0, 0, 0, 0, (byte) 0x39})).build()).setPsn((short) 5).build()).build())
        .setDomainId(new DomainIdentifier(28282828L)).build()).build();

    private static final RouteDistinguisher RD = new RouteDistinguisher(BigInteger.ONE);
    private static final Identifier ID = new Identifier(BigInteger.ONE);
    private static final CLinkstateDestination LINKSTATE_DESTINATION = new CLinkstateDestinationBuilder()
        .setDistinguisher(RD)
        .setIdentifier(ID)
        .setObjectType(OBJECT_TYPE2)
        .setProtocolId(ProtocolId.IsisLevel1).build();

    private static final DestinationLinkstateCase REACH_NLRI = new DestinationLinkstateCaseBuilder().setDestinationLinkstate(new DestinationLinkstateBuilder()
        .setCLinkstateDestination(Collections.singletonList(LINKSTATE_DESTINATION)).build()).build();
    private static final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLinkstateCase UNREACH_NLRI =
        new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.unreach.nlri.withdrawn
            .routes.destination.type.DestinationLinkstateCaseBuilder().setDestinationLinkstate(new org.opendaylight.yang.gen.v1.urn.opendaylight
            .params.xml.ns.yang.bgp.linkstate.rev150210.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.destination.linkstate
            ._case.DestinationLinkstateBuilder().setCLinkstateDestination(Collections.singletonList(LINKSTATE_DESTINATION)).build()).build();

    static {
        final BGPActivator act = new BGPActivator();
        final BGPExtensionProviderContext context = new SimpleBGPExtensionProviderContext();
        act.start(context);
        assertEquals(LinkstateAddressFamily.class, context.getAddressFamilyRegistry().classForFamily(16388));
        assertEquals(LinkstateSubsequentAddressFamily.class, context.getSubsequentAddressFamilyRegistry().classForFamily(71));
        final ByteBuf buffer = Unpooled.buffer();
        SimpleNlriTypeRegistry.getInstance().serializeNlriType(LINKSTATE_DESTINATION, buffer);
        final byte[] arrayKey = ByteArray.readAllBytes(buffer);
        ROUTE_KEY = new LinkstateRouteKey(arrayKey);
        ROUTE = new LinkstateRouteBuilder().setKey(ROUTE_KEY).setDistinguisher(RD).setIdentifier(ID).setObjectType(OBJECT_TYPE2)
            .setProtocolId(ProtocolId.IsisLevel1).setAttributes(new AttributesBuilder().build()).build();
        ROUTES = new LinkstateRoutesBuilder().setLinkstateRoute(Collections.singletonList(ROUTE)).build();
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();
        setUpTestCustomizer(RIB_SUPPORT);
    }

    @Test
    public void testDeleteRoutes() {
        RIB_SUPPORT.deleteRoutes(this.tx, getTablePath(), createNlriWithDrawnRoute(UNREACH_NLRI));
        final InstanceIdentifier<LinkstateRoute> instanceIdentifier = (InstanceIdentifier<LinkstateRoute>) this.deletedRoutes.get(0);
        assertEquals(ROUTE_KEY, instanceIdentifier.firstKeyOf(LinkstateRoute.class));
    }

    @Test
    public void testPutRoutes() {
        RIB_SUPPORT.putRoutes(this.tx, getTablePath(), createNlriAdvertiseRoute(REACH_NLRI), createAttributes());
        final LinkstateRoute route = (LinkstateRoute) this.insertedRoutes.get(0).getValue();
        assertEquals(ROUTE, route);
    }

    @Test
    public void testEmptyRoute() throws Exception {
        final Routes empty = new LinkstateRoutesCaseBuilder().setLinkstateRoutes(
            new LinkstateRoutesBuilder().setLinkstateRoute(Collections.emptyList()).build()).build();
        final ChoiceNode emptyRoutes = RIB_SUPPORT.emptyRoutes();
        assertEquals(createRoutes(empty), emptyRoutes);
    }

    @Test
    public void testBuildMpUnreachNlriUpdate() {
        final Update update = RIB_SUPPORT.buildUpdate(Collections.emptyList(), createRoutes(ROUTES), ATTRIBUTES);
        assertEquals(UNREACH_NLRI, update.getAttributes().getAugmentation(Attributes2.class)
            .getMpUnreachNlri().getWithdrawnRoutes().getDestinationType());
        assertNull(update.getAttributes().getAugmentation(Attributes1.class));
    }

    @Test
    public void testBuildMpReachNlriUpdate() {
        final Update update = RIB_SUPPORT.buildUpdate(createRoutes(ROUTES), Collections.emptyList(), ATTRIBUTES);
        assertEquals(REACH_NLRI, update.getAttributes().getAugmentation(Attributes1.class).getMpReachNlri().getAdvertizedRoutes().getDestinationType());
        assertNull(update.getAttributes().getAugmentation(Attributes2.class));
    }

    @Test
    public void testIsComplexRoute() {
        Assert.assertTrue(RIB_SUPPORT.isComplexRoute());
    }

    @Test
    public void testCacheableNlriObjects() {
        Assert.assertEquals(ImmutableSet.of(), RIB_SUPPORT.cacheableNlriObjects());
    }

    @Test
    public void testCacheableAttributeObjects() {
        Assert.assertEquals(ImmutableSet.of(), RIB_SUPPORT.cacheableAttributeObjects());
    }

    @Test
    public void testRouteIdAddPath() {
        Assert.assertNull(RIB_SUPPORT.getRouteIdAddPath(AbstractRIBSupportTest.PATH_ID, null));
    }

    @Test
    public void testRoutePath() {
        final NodeIdentifierWithPredicates prefixNii = createRouteNIWP(ROUTES);
        Assert.assertEquals(getRoutePath().node(prefixNii), RIB_SUPPORT.routePath(getTablePath().node(Routes.QNAME), prefixNii));
    }

    @Test
    public void testExtractPathId() {
        Assert.assertEquals((Long) NON_PATH_ID, RIB_SUPPORT.extractPathId(null));
    }

    @Test
    public void testRouteAttributesIdentifier() {
        Assert.assertEquals(new NodeIdentifier(QName.create(LinkstateRoutes.QNAME,
            org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.tables.Attributes.QNAME.getLocalName().intern())),
            RIB_SUPPORT.routeAttributesIdentifier());
    }

    @Test
    public void testRoutesCaseClass() {
        Assert.assertEquals(LinkstateRoutesCase.class, RIB_SUPPORT.routesCaseClass());
    }

    @Test
    public void testRoutesContainerClass() {
        Assert.assertEquals(LinkstateRoutes.class, RIB_SUPPORT.routesContainerClass());
    }

    @Test
    public void testRoutesListClass() {
        Assert.assertEquals(LinkstateRoute.class, RIB_SUPPORT.routesListClass());
    }

    @Test
    public void testChangedRoutes() {
        final Routes emptyCase = new LinkstateRoutesCaseBuilder().build();
        DataTreeCandidateNode tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(emptyCase)).getRootNode();
        Assert.assertTrue(RIB_SUPPORT.changedRoutes(tree).isEmpty());

        final Routes emptyRoutes = new LinkstateRoutesCaseBuilder().setLinkstateRoutes(new LinkstateRoutesBuilder().build()).build();
        tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(emptyRoutes)).getRootNode();
        Assert.assertTrue(RIB_SUPPORT.changedRoutes(tree).isEmpty());

        final Routes routes = new LinkstateRoutesCaseBuilder().setLinkstateRoutes(ROUTES).build();
        tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(routes)).getRootNode();
        final Collection<DataTreeCandidateNode> result = RIB_SUPPORT.changedRoutes(tree);
        Assert.assertFalse(result.isEmpty());
    }
}