/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.memcache.binary;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http2.Http2OrHttpChooser.SelectedProtocol;
import io.netty.handler.codec.http2.Http2SecurityUtil;
import io.netty.handler.codec.memcache.binary.BinaryMemcacheClientCodec;
import io.netty.handler.codec.memcache.binary.BinaryMemcacheObjectAggregator;
import io.netty.handler.ssl.ApplicationProtocolConfig;
import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslProvider;
import io.netty.handler.ssl.SupportedCipherSuiteFilter;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * Simple memcache client that demonstrates get and set commands against a memcache server.
 */
public final class MemcacheClient {

    static final boolean SSL = System.getProperty("ssl") != null;
    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", "11211"));

    public static void main(String[] args) throws Exception {
        // Configure SSL.
        final SslContext sslCtx;
        if (SSL) {
            sslCtx = SslContext.newClientContext(SslProvider.JDK,
                    null, InsecureTrustManagerFactory.INSTANCE, Http2SecurityUtil.CIPHERS,
                    /* NOTE: the following filter may not include all ciphers required by the HTTP/2 specification
                     * Please refer to the HTTP/2 specification for cipher requirements. */
                    SupportedCipherSuiteFilter.INSTANCE,
                    new ApplicationProtocolConfig(
                            Protocol.ALPN,
                            SelectorFailureBehavior.FATAL_ALERT,
                            SelectedListenerFailureBehavior.FATAL_ALERT,
                            SelectedProtocol.HTTP_2.protocolName(),
                            SelectedProtocol.HTTP_1_1.protocolName()),
                    0, 0);
        } else {
            sslCtx = null;
        }

        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline p = ch.pipeline();
                            if (sslCtx != null) {
                                p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                            }
                            p.addLast(new BinaryMemcacheClientCodec());
                            p.addLast(new BinaryMemcacheObjectAggregator(Integer.MAX_VALUE));
                            p.addLast(new MemcacheClientHandler());
                        }
                    });

            // Start the connection attempt.
            Channel ch = b.connect(HOST, PORT).sync().channel();

            // Read commands from the stdin.
            System.out.println("Enter commands (quit to end)");
            System.out.println("get <key>");
            System.out.println("set <key> <value>");
            ChannelFuture lastWriteFuture = null;
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            for (;;) {
                String line = in.readLine();
                if (line == null) {
                    break;
                }
                if ("quit".equals(line.toLowerCase())) {
                    ch.close().sync();
                    break;
                }
                // Sends the received line to the server.
                lastWriteFuture = ch.writeAndFlush(line);
            }

            // Wait until all messages are flushed before closing the channel.
            if (lastWriteFuture != null) {
                lastWriteFuture.sync();
            }
        } finally {
            group.shutdownGracefully();
        }
    }
}
