/*
 * Copyright (c) 2014 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.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import com.google.common.collect.Lists;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.DefaultChannelPromise;
import io.netty.channel.EventLoop;
import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.BGPError;
import org.opendaylight.protocol.bgp.parser.impl.message.update.LocalPreferenceAttributeParser;
import org.opendaylight.protocol.bgp.rib.spi.RibSupportUtils;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
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.ipv4.routes.ipv4.routes.Ipv4Route;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.KeepaliveBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.OpenBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.UpdateBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.BgpParameters;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.BgpParametersBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.OptionalCapabilitiesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
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.message.rev130919.path.attributes.attributes.AsPath;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.AsPathBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.LocalPref;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.LocalPrefBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.Origin;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.OriginBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.message.NlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.message.WithdrawnRoutesBuilder;
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.multiprotocol.rev130919.Attributes2Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.RouteRefreshBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.MultiprotocolCapabilityBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.ApplicationRibId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.LocRib;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.Tables;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.BgpOrigin;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv6AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.CNextHop;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.c.next.hop.Ipv4NextHopCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.c.next.hop.ipv4.next.hop._case.Ipv4NextHopBuilder;
import org.opendaylight.yangtools.yang.binding.Notification;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;

public class PeerTest extends AbstractRIBTestSetup {

    private ApplicationPeer peer;

    private BGPSessionImpl session;

    private Map<YangInstanceIdentifier, NormalizedNode<?,?>> routes;

    private BGPPeer classic;

    @Override
    @Before
    public void setUp() throws Exception {
        super.setUp();
        this.routes = new HashMap<>();
        overrideMockedBehaviour();
    }

    private void overrideMockedBehaviour() {
        Mockito.doAnswer(new Answer<Object>() {
            @Override
            public Object answer(final InvocationOnMock invocation) throws Throwable {
                final Object[] args = invocation.getArguments();
                final NormalizedNode<?,?>node = (NormalizedNode<?,?>)args[2];
                if (node.getIdentifier().getNodeType().equals(Ipv4Route.QNAME) || node.getNodeType().equals(PREFIX_QNAME)) {
                    PeerTest.this.routes.put((YangInstanceIdentifier) args[1], node);
                }
                return args[1];
            }
        }).when(getTransaction()).put(Mockito.eq(LogicalDatastoreType.OPERATIONAL), Mockito.any(YangInstanceIdentifier.class), Mockito.any(NormalizedNode.class));

        Mockito.doAnswer(new Answer<Object>() {
            @Override
            public Object answer(final InvocationOnMock invocation) throws Throwable {
                final Object[] args = invocation.getArguments();
                PeerTest.this.routes.remove(args[1]);
                return args[1];
            }
        }).when(getTransaction()).delete(Mockito.eq(LogicalDatastoreType.OPERATIONAL), Mockito.any(YangInstanceIdentifier.class));
    }


    @Test
    public void testAppPeer() {
        final Ipv4Prefix first = new Ipv4Prefix("127.0.0.2/32");
        final Ipv4Prefix second = new Ipv4Prefix("127.0.0.1/32");
        final Ipv4Prefix third = new Ipv4Prefix("127.0.0.3/32");
        this.peer = new ApplicationPeer(new ApplicationRibId("t"), new Ipv4Address("127.0.0.1"), getRib());
        final YangInstanceIdentifier base = getRib().getYangRibId().node(LocRib.QNAME).node(Tables.QNAME).node(RibSupportUtils.toYangTablesKey(KEY));
        this.peer.onDataTreeChanged(ipv4Input(base, ModificationType.WRITE, first, second, third));
        assertEquals(3, this.routes.size());

        this.peer.onDataTreeChanged(ipv4Input(base, ModificationType.DELETE, third));
        assertEquals(2, this.routes.size());
    }

    @Test
    public void testClassicPeer() throws Exception {
        this.classic = new BGPPeer("testPeer", getRib(), PeerRole.Ibgp, null);
        this.mockSession();
        assertEquals("testPeer", this.classic.getName());
        this.classic.onSessionUp(this.session);
        Assert.assertArrayEquals(new byte[] {1, 1, 1, 1}, this.classic.getRawIdentifier());
        assertEquals("BGPPeer{name=testPeer, tables=[TablesKey [_afi=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily, _safi=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily]]}", this.classic.toString());

        final List<Ipv4Prefix> prefs = Lists.newArrayList(new Ipv4Prefix("8.0.1.0/28"), new Ipv4Prefix("127.0.0.1/32"), new Ipv4Prefix("2.2.2.2/24"));
        final UpdateBuilder ub = new UpdateBuilder();
        ub.setNlri(new NlriBuilder().setNlri(prefs).build());
        final Origin origin = new OriginBuilder().setValue(BgpOrigin.Igp).build();
        final AsPath asPath = new AsPathBuilder().setSegments(Collections.emptyList()).build();
        final CNextHop nextHop = new Ipv4NextHopCaseBuilder().setIpv4NextHop(new Ipv4NextHopBuilder().setGlobal(new Ipv4Address("127.0.0.1")).build()).build();
        final AttributesBuilder ab = new AttributesBuilder();
        ub.setAttributes(ab.setOrigin(origin).setAsPath(asPath).setCNextHop(nextHop).build());
        try {
            this.classic.onMessage(this.session, ub.build());
            fail();
        } catch (BGPDocumentedException e) {
            assertEquals(BGPError.MANDATORY_ATTR_MISSING_MSG + "LOCAL_PREF", e.getMessage());
            assertEquals(BGPError.WELL_KNOWN_ATTR_MISSING.getCode(), e.getError().getCode());
            assertEquals(BGPError.WELL_KNOWN_ATTR_MISSING.getSubcode(), e.getError().getSubcode());
            assertArrayEquals(new byte[] { LocalPreferenceAttributeParser.TYPE }, e.getData());
        }
        assertEquals(0, this.routes.size());

        final LocalPref localPref = new LocalPrefBuilder().setPref((long)100).build();
        ub.setAttributes(ab.setLocalPref(localPref).build());
        this.classic.onMessage(this.session, ub.build());
        assertEquals(3, this.routes.size());

        //create new peer so that it gets advertized routes from RIB
        try (final BGPPeer testingPeer = new BGPPeer("testingPeer", getRib(), PeerRole.Ibgp, null)) {
            testingPeer.onSessionUp(this.session);
            assertEquals(3, this.routes.size());
            assertEquals(1, testingPeer.getBgpPeerState().getSessionEstablishedCount().getValue().intValue());
            assertEquals(1, testingPeer.getBgpPeerState().getRouteTable().size());
            assertNotNull(testingPeer.getBgpSessionState());
        }

        final List<Ipv4Prefix> prefs2 = Lists.newArrayList(new Ipv4Prefix("8.0.1.0/28"), new Ipv4Prefix("8.0.1.16/28"));
        ub.setNlri(new NlriBuilder().setNlri(prefs2).build());
        ub.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setWithdrawnRoutes(prefs).build());
        this.classic.onMessage(this.session, ub.build());
        assertEquals(2, this.routes.size());
        this.classic.onMessage(this.session, new KeepaliveBuilder().build());
        this.classic.onMessage(this.session, new UpdateBuilder().setAttributes(
            new AttributesBuilder().addAugmentation(
                    Attributes2.class,
                    new Attributes2Builder().setMpUnreachNlri(
                            new MpUnreachNlriBuilder().setAfi(AFI).setSafi(SAFI).build()).build()).build()).build());
        this.classic.onMessage(this.session, new RouteRefreshBuilder().setAfi(AFI).setSafi(SAFI).build());
        this.classic.onMessage(this.session, new RouteRefreshBuilder().setAfi(Ipv6AddressFamily.class).setSafi(SAFI).build());
        assertEquals(2, this.routes.size());
        this.classic.releaseConnection();
    }

    private void mockSession() {
        final EventLoop eventLoop = Mockito.mock(EventLoop.class);
        final Channel channel = Mockito.mock(Channel.class);
        final ChannelPipeline pipeline = Mockito.mock(ChannelPipeline.class);
        Mockito.doReturn(null).when(eventLoop).schedule(any(Runnable.class), any(long.class), any(TimeUnit.class));
        Mockito.doReturn(eventLoop).when(channel).eventLoop();
        Mockito.doReturn(Boolean.TRUE).when(channel).isWritable();
        Mockito.doReturn(null).when(channel).close();
        Mockito.doReturn(pipeline).when(channel).pipeline();
        Mockito.doCallRealMethod().when(channel).toString();
        Mockito.doReturn(pipeline).when(pipeline).addLast(Mockito.any(ChannelHandler.class));
        Mockito.doReturn(new DefaultChannelPromise(channel)).when(channel).writeAndFlush(any(Notification.class));
        Mockito.doReturn(new InetSocketAddress("localhost", 12345)).when(channel).remoteAddress();
        Mockito.doReturn(new InetSocketAddress("localhost", 12345)).when(channel).localAddress();
        final List<BgpParameters> params = Lists.newArrayList(new BgpParametersBuilder().setOptionalCapabilities(
            Lists.newArrayList(new OptionalCapabilitiesBuilder().setCParameters(new CParametersBuilder().addAugmentation(
                CParameters1.class, new CParameters1Builder().setMultiprotocolCapability(new MultiprotocolCapabilityBuilder()
                    .setAfi(Ipv4AddressFamily.class).setSafi(UnicastSubsequentAddressFamily.class).build()).build()).build()).build())).build());
        this.session = new BGPSessionImpl(this.classic, channel, new OpenBuilder().setBgpIdentifier(new Ipv4Address("1.1.1.1")).setHoldTimer(50).setMyAsNumber(72).setBgpParameters(params).build(), 30, null);
    }
}