/*
 * 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.protocol.bgp.rib.impl;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import java.util.Collection;
import java.util.Collections;
import org.junit.Assert;
import org.junit.Test;
import org.opendaylight.protocol.bgp.rib.spi.AbstractRIBSupportTest;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.bgp.rib.rib.loc.rib.tables.routes.Ipv4RoutesCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.bgp.rib.rib.loc.rib.tables.routes.Ipv4RoutesCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.DestinationIpv4Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.Ipv4Routes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.Ipv4RoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.ipv4.routes.Ipv4Route;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.ipv4.routes.Ipv4RouteBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.ipv4.routes.Ipv4RouteKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4Case;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4CaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.PathId;
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.Attributes;
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.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.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;

public final class IPv4RIBSupportTest extends AbstractRIBSupportTest {
    private static final IPv4RIBSupport RIB_SUPPORT = IPv4RIBSupport.getInstance();
    private static final PathId PATH_ID = new PathId(1L);
    private static final Ipv4Prefix PREFIX = new Ipv4Prefix("1.2.3.4/32");
    private static final Ipv4RouteKey ROUTE_KEY = new Ipv4RouteKey(PATH_ID, PREFIX);
    private static final Ipv4Prefixes IPV4_PREFIXES = new Ipv4PrefixesBuilder().setPathId(PATH_ID)
        .setPrefix(PREFIX).build();
    private static final DestinationIpv4Case REACH_NLRI = new DestinationIpv4CaseBuilder().setDestinationIpv4(new DestinationIpv4Builder()
        .setIpv4Prefixes(Lists.newArrayList(IPV4_PREFIXES)).build()).build();

    private static final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update
        .attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4Case UNREACH_NLRI =
        new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update
            .attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4CaseBuilder().setDestinationIpv4(
            new DestinationIpv4Builder().setIpv4Prefixes(Lists.newArrayList(IPV4_PREFIXES)).build()).build();

    private static final Ipv4Route ROUTE = new Ipv4RouteBuilder().setAttributes(ATTRIBUTES).setPathId(PATH_ID).setPrefix(PREFIX).build();
    private static final Ipv4Routes ROUTES = new Ipv4RoutesBuilder().setIpv4Route(Collections.singletonList(ROUTE)).build();
    private static final Ipv4Routes EMPTY_ROUTES = new Ipv4RoutesBuilder().setIpv4Route(Collections.emptyList()).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<Ipv4Route> instanceIdentifier = (InstanceIdentifier<Ipv4Route>) this.deletedRoutes.get(0);
        assertEquals(ROUTE_KEY, instanceIdentifier.firstKeyOf(Ipv4Route.class));
    }

    @Test
    public void testPutRoutes() {
        RIB_SUPPORT.putRoutes(this.tx, getTablePath(), createNlriAdvertiseRoute(REACH_NLRI), createAttributes());
        final Ipv4Route route = (Ipv4Route) this.insertedRoutes.get(0).getValue();
        assertEquals(ROUTE, route);
    }


    @Test
    public void testEmptyRoute() throws Exception {
        final Routes empty = new Ipv4RoutesCaseBuilder().setIpv4Routes(EMPTY_ROUTES).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.assertFalse(RIB_SUPPORT.isComplexRoute());
    }

    @Test
    public void testCacheableNlriObjects() {
        Assert.assertEquals(ImmutableSet.of(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.Ipv4Prefix.class), RIB_SUPPORT.cacheableNlriObjects());
    }

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

    @Test
    public void testRouteIdAddPath() {
        final NodeIdentifierWithPredicates expected = createRouteNIWP(ROUTES);
        final NodeIdentifierWithPredicates prefixNii = new NodeIdentifierWithPredicates(RIB_SUPPORT.routeQName(), ImmutableMap.of(RIB_SUPPORT.routeKeyQName(), PREFIX.getValue()));
        Assert.assertEquals(expected, RIB_SUPPORT.getRouteIdAddPath(AbstractRIBSupportTest.PATH_ID, prefixNii));
    }

    @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() {
        final NormalizedNode<?, ?> route = Iterables.getOnlyElement(createRoutes(ROUTES));
        Assert.assertEquals(PATH_ID.getValue(), RIB_SUPPORT.extractPathId(route));
    }

    @Test
    public void testRouteAttributesIdentifier() {
        Assert.assertEquals(new NodeIdentifier(QName.create(Ipv4Routes.QNAME, Attributes.QNAME.getLocalName().intern())), RIB_SUPPORT
            .routeAttributesIdentifier());
    }

    @Test
    public void testRoutesCaseClass() {
        Assert.assertEquals(Ipv4RoutesCase.class, RIB_SUPPORT.routesCaseClass());
    }

    @Test
    public void testRoutesContainerClass() {
        Assert.assertEquals(Ipv4Routes.class, RIB_SUPPORT.routesContainerClass());
    }

    @Test
    public void testRoutesListClass() {
        Assert.assertEquals(Ipv4Route.class, RIB_SUPPORT.routesListClass());
    }

    @Test
    public void testChangedRoutes() {
        final Routes emptyCase = new Ipv4RoutesCaseBuilder().build();
        DataTreeCandidateNode tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(emptyCase)).getRootNode();
        Assert.assertTrue(RIB_SUPPORT.changedRoutes(tree).isEmpty());

        final Routes emptyRoutes = new Ipv4RoutesCaseBuilder().setIpv4Routes(new Ipv4RoutesBuilder().build()).build();
        tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(emptyRoutes)).getRootNode();
        Assert.assertTrue(RIB_SUPPORT.changedRoutes(tree).isEmpty());

        final Routes routes = new Ipv4RoutesCaseBuilder().setIpv4Routes(ROUTES).build();
        tree = DataTreeCandidates.fromNormalizedNode(getRoutePath(), createRoutes(routes)).getRootNode();
        final Collection<DataTreeCandidateNode> result = RIB_SUPPORT.changedRoutes(tree);
        Assert.assertFalse(result.isEmpty());
    }
}