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/*
 * 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.netconf.ssh;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import java.nio.charset.StandardCharsets;
import org.opendaylight.netconf.api.messages.NetconfHelloMessageAdditionalHeader;
import org.opendaylight.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerReader;
import org.opendaylight.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerWriter;
import org.opendaylight.netconf.shaded.sshd.common.io.IoInputStream;
import org.opendaylight.netconf.shaded.sshd.common.io.IoOutputStream;
import org.opendaylight.netconf.shaded.sshd.server.ExitCallback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Netty handler that reads SSH from remote client and writes to delegate server
 * and reads from delegate server and writes to remote client.
 */
final class SshProxyClientHandler extends ChannelInboundHandlerAdapter {

    private static final Logger LOG = LoggerFactory.getLogger(SshProxyClientHandler.class);

    private final IoInputStream in;
    private final IoOutputStream out;

    private AsyncSshHandlerReader asyncSshHandlerReader;
    private AsyncSshHandlerWriter asyncSshHandlerWriter;

    private final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader;
    private final ExitCallback callback;

    SshProxyClientHandler(final IoInputStream in, final IoOutputStream out,
                          final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader,
                          final ExitCallback callback) {
        this.in = in;
        this.out = out;
        this.netconfHelloMessageAdditionalHeader = netconfHelloMessageAdditionalHeader;
        this.callback = callback;
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {
        writeAdditionalHeader(ctx);

        asyncSshHandlerWriter = new AsyncSshHandlerWriter(out);
        asyncSshHandlerReader = new AsyncSshHandlerReader(() -> {
            // Close both sessions (delegate server and remote client)
            ctx.fireChannelInactive();
            ctx.disconnect();
            ctx.close();
            asyncSshHandlerReader.close();
            asyncSshHandlerWriter.close();
        }, msg -> {
            if (LOG.isTraceEnabled()) {
                LOG.trace("Forwarding message for client: {} on channel: {}, message: {}",
                        netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel(),
                        AsyncSshHandlerWriter.byteBufToString(msg));
            }
            // Just forward to delegate
            ctx.writeAndFlush(msg);
        }, "ssh" + netconfHelloMessageAdditionalHeader.getAddress(), in);


        super.channelActive(ctx);
    }

    private void writeAdditionalHeader(final ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.copiedBuffer(netconfHelloMessageAdditionalHeader.toFormattedString()
                .getBytes(StandardCharsets.UTF_8)));
    }

    @Override
    public void channelRead(final ChannelHandlerContext ctx, final Object msg) {
        asyncSshHandlerWriter.write(ctx, msg, ctx.newPromise());
    }

    @Override
    public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
        LOG.debug("Internal connection to netconf server was dropped for client: {} on channel: {}",
                netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel());
        callback.onExit(1, "Internal connection to netconf server was dropped for client: "
                + netconfHelloMessageAdditionalHeader.getAddress() + " on channel: " + ctx.channel());
        super.channelInactive(ctx);
    }
}