package com.qlm.netty;

import com.qlm.netty.codec.StringDecoder;
import com.qlm.netty.codec.StringEncoder;
import com.qlm.netty.handler.NettyServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.timeout.IdleStateHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

public class NettyServer {
    private static final Logger logger = LoggerFactory.getLogger(NettyServer.class);

    private int port;
    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;

    public NettyServer(int port) {
        this.port = port;
    }

    public void start() throws InterruptedException {
        // 创建两个线程组
        bossGroup = new NioEventLoopGroup(1);
        workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childOption(ChannelOption.SO_KEEPALIVE, true)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            // 添加空闲状态处理器（60秒读取超时）
                            ch.pipeline().addLast(new IdleStateHandler(60, 0, 0, TimeUnit.SECONDS));
                            // 添加自定义编解码器
                            ch.pipeline().addLast(new StringDecoder());
                            ch.pipeline().addLast(new StringEncoder());
                            // 添加业务处理器
                            ch.pipeline().addLast(new NettyServerHandler());
                        }
                    });

            logger.info("Netty服务端启动成功，监听端口: {}", port);
            ChannelFuture future = bootstrap.bind(port).sync();
            future.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
            logger.info("Netty服务端已关闭");
        }
    }

    public void stop() {
        if (workerGroup != null) {
            workerGroup.shutdownGracefully();
        }
        if (bossGroup != null) {
            bossGroup.shutdownGracefully();
        }
        logger.info("Netty服务端已停止");
    }
}