package com.example.agvcontroller.socket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
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;

public class NettyServer {

    private final int port;
    private Channel serverChannel; // 用于保存服务器的 Channel
    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;


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

    public void start() throws InterruptedException {
        bossGroup = new NioEventLoopGroup();
        workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new NettyServerHandler());
                        }
                    })
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture f = b.bind(port).sync();
            serverChannel = f.channel(); // 保存服务器的 Channel
            serverChannel.closeFuture().sync();
        } finally {
            stop();
        }
    }

    public void stop() {
        if (serverChannel != null) {
            serverChannel.close(); // 关闭服务器的 Channel
        }
        if (workerGroup != null) {
            workerGroup.shutdownGracefully();
        }
        if (bossGroup != null) {
            bossGroup.shutdownGracefully();
        }
    }
}