/*
 * 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.controller.netconf.client;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.Sets;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.util.HashedWheelTimer;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GlobalEventExecutor;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Set;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.opendaylight.controller.netconf.api.NetconfMessage;
import org.opendaylight.controller.netconf.client.conf.NetconfClientConfiguration;
import org.opendaylight.controller.netconf.client.conf.NetconfClientConfiguration.NetconfClientProtocol;
import org.opendaylight.controller.netconf.client.conf.NetconfClientConfigurationBuilder;
import org.opendaylight.controller.netconf.nettyutil.handler.ssh.authentication.AuthenticationHandler;
import org.opendaylight.controller.netconf.nettyutil.handler.ssh.authentication.LoginPassword;
import org.opendaylight.protocol.framework.NeverReconnectStrategy;


/**
 * Synchronous netconf client suitable for testing
 */
public class TestingNetconfClient implements Closeable {

    public static final int DEFAULT_CONNECT_TIMEOUT = 5000;

    private final String label;
    private final NetconfClientSession clientSession;
    private final NetconfClientSessionListener sessionListener;
    private final long sessionId;

    public TestingNetconfClient(String clientLabel,
                                 NetconfClientDispatcher netconfClientDispatcher, final NetconfClientConfiguration config) throws InterruptedException {
        this.label = clientLabel;
        sessionListener = config.getSessionListener();
        Future<NetconfClientSession> clientFuture = netconfClientDispatcher.createClient(config);
        clientSession = get(clientFuture);//TODO: make static
        this.sessionId = clientSession.getSessionId();
    }

    private NetconfClientSession get(Future<NetconfClientSession> clientFuture) throws InterruptedException {
        try {
            return clientFuture.get();
        } catch (CancellationException e) {
            throw new RuntimeException("Cancelling " + this, e);
        } catch (ExecutionException e) {
            throw new IllegalStateException("Unable to create " + this, e);
        }
    }

    public Future<NetconfMessage> sendRequest(NetconfMessage message) {
        return ((SimpleNetconfClientSessionListener)sessionListener).sendRequest(message);
    }

    public NetconfMessage sendMessage(NetconfMessage message, int attemptMsDelay) throws ExecutionException,
            InterruptedException, TimeoutException {
        return sendRequest(message).get(attemptMsDelay, TimeUnit.MILLISECONDS);
    }

    public NetconfMessage sendMessage(NetconfMessage message) throws ExecutionException,
            InterruptedException, TimeoutException {
        return sendMessage(message, DEFAULT_CONNECT_TIMEOUT);
    }

    @Override
    public void close() throws IOException {
        clientSession.close();
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("TestingNetconfClient{");
        sb.append("label=").append(label);
        sb.append(", sessionId=").append(sessionId);
        sb.append('}');
        return sb.toString();
    }

    public long getSessionId() {
        return sessionId;
    }

    public Set<String> getCapabilities() {
        Preconditions.checkState(clientSession != null, "Client was not initialized successfully");
        return Sets.newHashSet(clientSession.getServerCapabilities());
    }

    public static void main(String[] args) throws Exception {
        HashedWheelTimer hashedWheelTimer = new HashedWheelTimer();
        NioEventLoopGroup nettyGroup = new NioEventLoopGroup();
        NetconfClientDispatcherImpl netconfClientDispatcher = new NetconfClientDispatcherImpl(nettyGroup, nettyGroup, hashedWheelTimer);
        LoginPassword authHandler = new LoginPassword("admin", "admin");
        TestingNetconfClient client = new TestingNetconfClient("client", netconfClientDispatcher, getClientConfig("127.0.0.1", 1830, true, Optional.of(authHandler)));
        System.console().writer().println(client.getCapabilities());
    }

    private static NetconfClientConfiguration getClientConfig(String host ,int port, boolean ssh, Optional<? extends AuthenticationHandler> maybeAuthHandler) throws UnknownHostException {
        InetSocketAddress netconfAddress = new InetSocketAddress(InetAddress.getByName(host), port);
        final NetconfClientConfigurationBuilder b = NetconfClientConfigurationBuilder.create();
        b.withAddress(netconfAddress);
        b.withSessionListener(new SimpleNetconfClientSessionListener());
        b.withReconnectStrategy(new NeverReconnectStrategy(GlobalEventExecutor.INSTANCE,
                NetconfClientConfigurationBuilder.DEFAULT_CONNECTION_TIMEOUT_MILLIS));
        if (ssh) {
            b.withProtocol(NetconfClientProtocol.SSH);
            b.withAuthHandler(maybeAuthHandler.get());
        } else {
            b.withProtocol(NetconfClientProtocol.TCP);
        }
        return b.build();
    }
}