/*
 * Copyright (c) 2013 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.testtool;

import com.google.common.base.Preconditions;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.util.concurrent.DefaultPromise;
import io.netty.util.concurrent.GlobalEventExecutor;
import io.netty.util.concurrent.Promise;
import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.Map;
import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.spi.pojo.ServiceLoaderBGPExtensionProviderContext;
import org.opendaylight.protocol.bgp.rib.impl.BGPHandlerFactory;
import org.opendaylight.protocol.bgp.rib.impl.BGPServerSessionNegotiatorFactory;
import org.opendaylight.protocol.bgp.rib.impl.BGPSessionImpl;
import org.opendaylight.protocol.bgp.rib.impl.BGPSessionProposalImpl;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionValidator;
import org.opendaylight.protocol.bgp.rib.impl.spi.ReusableBGPPeer;
import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
import org.opendaylight.protocol.framework.AbstractDispatcher;
import org.opendaylight.protocol.framework.ProtocolSession;
import org.opendaylight.protocol.framework.SessionListener;
import org.opendaylight.protocol.framework.SessionNegotiatorFactory;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev131125.LinkstateAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev131125.LinkstateSubsequentAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
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.SubsequentAddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily;
import org.opendaylight.yangtools.yang.binding.Notification;

public class BGPSpeakerMock<M, S extends ProtocolSession<M>, L extends SessionListener<M, ?, ?>> extends AbstractDispatcher<S, L> {

    private final SessionNegotiatorFactory<M, S, L> negotiatorFactory;
    private final BGPHandlerFactory factory;

    public BGPSpeakerMock(final SessionNegotiatorFactory<M, S, L> negotiatorFactory, final BGPHandlerFactory factory,
        final DefaultPromise<BGPSessionImpl> defaultPromise) {
        super(GlobalEventExecutor.INSTANCE, new NioEventLoopGroup(), new NioEventLoopGroup());
        this.negotiatorFactory = Preconditions.checkNotNull(negotiatorFactory);
        this.factory = Preconditions.checkNotNull(factory);
    }

    public void createServer(final InetSocketAddress address) {
        super.createServer(address, new PipelineInitializer<S>() {

            @Override
            public void initializeChannel(final SocketChannel ch, final Promise<S> promise) {
                ch.pipeline().addLast(BGPSpeakerMock.this.factory.getDecoders());
                ch.pipeline().addLast("negotiator",
                    BGPSpeakerMock.this.negotiatorFactory.getSessionNegotiator(null, ch, promise));
                ch.pipeline().addLast(BGPSpeakerMock.this.factory.getEncoders());
            }
        });
    }

    public static void main(final String[] args) throws Exception {
        final Map<Class<? extends AddressFamily>, Class<? extends SubsequentAddressFamily>> tables = new HashMap<>();
        tables.put(Ipv4AddressFamily.class, UnicastSubsequentAddressFamily.class);
        tables.put(LinkstateAddressFamily.class, LinkstateSubsequentAddressFamily.class);

        final BGPPeerRegistry peerRegistry = new BGPPeerRegistry() {
            @Override
            public void addPeer(final IpAddress ip, final ReusableBGPPeer peer, final BGPSessionPreferences prefs) {}

            @Override
            public void removePeer(final IpAddress ip) {}

            @Override
            public boolean isPeerConfigured(final IpAddress ip) {
                return true;
            }

            @Override
            public BGPSessionListener getPeer(final IpAddress ip, final Ipv4Address sourceId, final Ipv4Address remoteId, final AsNumber asNumber) throws BGPDocumentedException {
                return new SpeakerSessionListener();
            }

            @Override
            public BGPSessionPreferences getPeerPreferences(final IpAddress ip) {
                return new BGPSessionProposalImpl((short) 90, new AsNumber(72L), new Ipv4Address("127.0.0.2"), tables).getProposal();
            }

            @Override
            public void close() throws Exception {

            }

            @Override
            public void removePeerSession(final IpAddress ip) {}
        };

        final SessionNegotiatorFactory<Notification, BGPSessionImpl, BGPSessionListener> snf = new BGPServerSessionNegotiatorFactory(new BGPSessionValidator() {
            @Override
            public void validate(final Open openObj, final BGPSessionPreferences prefs) throws BGPDocumentedException {
                // NOOP
            }
        }, peerRegistry);

        final BGPSpeakerMock<Notification, BGPSessionImpl, BGPSessionListener> mock = new BGPSpeakerMock<>(snf, new BGPHandlerFactory(ServiceLoaderBGPExtensionProviderContext.getSingletonInstance().getMessageRegistry()), new DefaultPromise<BGPSessionImpl>(GlobalEventExecutor.INSTANCE));

        mock.createServer(new InetSocketAddress("127.0.0.2", 12345));
    }
}