/*
 * 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.bmp.mock;

import com.google.common.base.Optional;
import com.google.common.util.concurrent.Uninterruptibles;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.nio.NioEventLoopGroup;
import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;
import org.opendaylight.protocol.bgp.parser.spi.pojo.ServiceLoaderBGPExtensionProviderContext;
import org.opendaylight.protocol.bmp.api.BmpDispatcher;
import org.opendaylight.protocol.bmp.api.BmpSession;
import org.opendaylight.protocol.bmp.api.BmpSessionListener;
import org.opendaylight.protocol.bmp.api.BmpSessionListenerFactory;
import org.opendaylight.protocol.bmp.impl.BmpDispatcherImpl;
import org.opendaylight.protocol.bmp.impl.session.DefaultBmpSessionFactory;
import org.opendaylight.protocol.bmp.parser.BmpActivator;
import org.opendaylight.protocol.bmp.spi.registry.BmpExtensionProviderActivator;
import org.opendaylight.protocol.bmp.spi.registry.BmpExtensionProviderContext;
import org.opendaylight.protocol.bmp.spi.registry.SimpleBmpExtensionProviderContext;
import org.opendaylight.protocol.concepts.KeyMapping;
import org.opendaylight.protocol.util.InetSocketAddressUtil;
import org.opendaylight.yangtools.yang.binding.Notification;

public class BmpMockTest {

    private final BmpSessionListener sessionListener = Mockito.mock(BmpSessionListener.class);
    private BmpExtensionProviderActivator bmpActivator;
    private BmpDispatcher bmpDispatcher;

    @Before
    public void setUp() {
        final BmpExtensionProviderContext ctx = new SimpleBmpExtensionProviderContext();
        this.bmpActivator = new BmpActivator(
            ServiceLoaderBGPExtensionProviderContext.getSingletonInstance());
        this.bmpActivator.start(ctx);
        this.bmpDispatcher = new BmpDispatcherImpl(new NioEventLoopGroup(), new NioEventLoopGroup(), ctx.getBmpMessageRegistry(),
            new DefaultBmpSessionFactory());
    }

    @After
    public void tearDown() throws Exception {
        this.bmpActivator.stop();
        this.bmpDispatcher.close();
    }

    @Test
    public void testMain() throws Exception {
        final InetSocketAddress serverAddr = InetSocketAddressUtil.getRandomLoopbackInetSocketAddress();
        final BmpSessionListenerFactory bmpSessionListenerFactory = () -> BmpMockTest.this.sessionListener;
        final ChannelFuture futureServer = bmpDispatcher.createServer(serverAddr,
            bmpSessionListenerFactory, Optional.<KeyMapping>absent());
        waitFutureComplete(futureServer);
        Channel serverChannel;
        int sessionUpWait;
        if (futureServer.isSuccess()) {
            serverChannel = futureServer.channel();
            sessionUpWait = 10;
        } else {
            serverChannel = null;
            // wait longer for the reconnection attempt
            sessionUpWait = 40;
        }

        BmpMock.main(new String[]{"--remote_address", InetSocketAddressUtil.toHostAndPort(serverAddr).toString(), "--peers_count", "3", "--pre_policy_routes", "3"});

        Mockito.verify(this.sessionListener, Mockito.timeout(TimeUnit.SECONDS.toMillis(sessionUpWait))).onSessionUp(Mockito.any(BmpSession.class));
        //1 * Initiate message + 3 * PeerUp Notification + 9 * Route Monitoring message
        Mockito.verify(this.sessionListener, Mockito.timeout(TimeUnit.SECONDS.toMillis(10)).times(13)).onMessage(Mockito.any(Notification.class));

        if (serverChannel != null) {
            serverChannel.close().sync();
        }
    }

    @Test
    public void testMainInPassiveMode() throws Exception {
        final InetSocketAddress serverAddr = InetSocketAddressUtil.getRandomLoopbackInetSocketAddress();
        final BmpSessionListenerFactory bmpSessionListenerFactory = () -> BmpMockTest.this.sessionListener;

        // create a local server in passive mode instead
        BmpMock.main(new String[]{"--local_address", InetSocketAddressUtil.toHostAndPort(serverAddr).toString(),
            "--peers_count", "3", "--pre_policy_routes", "3", "--passive"});
        final ChannelFuture futureServer = bmpDispatcher.createClient(serverAddr,
            bmpSessionListenerFactory, Optional.<KeyMapping>absent());
        waitFutureComplete(futureServer);
        Channel serverChannel;
        int sessionUpWait;
        if (futureServer.isSuccess()) {
            serverChannel = futureServer.channel();
            sessionUpWait = 10;
        } else {
            serverChannel = null;
            // wait longer for the reconnection attempt
            sessionUpWait = 40;
        }

        Mockito.verify(this.sessionListener, Mockito.timeout(TimeUnit.SECONDS.toMillis(sessionUpWait))).onSessionUp(Mockito.any(BmpSession.class));
        //1 * Initiate message + 3 * PeerUp Notification + 9 * Route Monitoring message
        Mockito.verify(this.sessionListener, Mockito.timeout(TimeUnit.SECONDS.toMillis(10)).times(13)).onMessage(Mockito.any(Notification.class));

        if (serverChannel != null) {
            serverChannel.close().sync();
        }
    }

    static void waitFutureComplete(final ChannelFuture future) throws InterruptedException {
        final CountDownLatch latch = new CountDownLatch(1);
        future.addListener(future1 -> latch.countDown());
        Uninterruptibles.awaitUninterruptibly(latch, 10, TimeUnit.SECONDS);
    }
}