package com.tongran.agentserver.server.netty;

import com.tongran.agentserver.server.netty.config.AgentNettyConfig;
import com.tongran.agentserver.server.netty.handler.DecoderHandler;
import com.tongran.agentserver.server.netty.handler.EncoderHandler;
import com.tongran.agentserver.server.netty.handler.NettyClientHandler;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.timeout.IdleStateHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

@Component
public class NettyTcpClient {

    private static final Logger logger = LoggerFactory.getLogger(NettyTcpClient.class);

    private EventLoopGroup group = new NioEventLoopGroup();

    private Channel channel;

    @Resource
    private AgentNettyConfig config;

    // 目标服务器IP和端口
//    private final String host = "www.tz2.xyz"; // 替换为实际IP
//    private final int port = 6610; // 替换为实际端口

    /**
     * 启动客户端连接
     */
    @PostConstruct
    public void start() {
        try {
            connect();
        } catch (Exception e) {
            logger.error("Netty客户端启动失败", e);
        }
    }

    public void connect() throws InterruptedException {
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                .option(ChannelOption.SO_KEEPALIVE, true)
                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5000)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) {
                        ChannelPipeline pipeline = ch.pipeline();
                        // 添加编解码器
                        pipeline.addLast("decoder", new DecoderHandler());
                        pipeline.addLast("encoder", new EncoderHandler());
                        // 添加心跳机制
                        pipeline.addLast("idleStateHandler", 
                            new IdleStateHandler(0, 0, 90, TimeUnit.SECONDS));
                        // 添加自定义处理器
                        pipeline.addLast("clientHandler", new NettyClientHandler());
                    }
                });

        // 连接服务器
        ChannelFuture future = bootstrap.connect(config.getHost(), config.getPort()).sync();
        
        // 监听连接状态
        future.addListener((ChannelFutureListener) f -> {
            if (f.isSuccess()) {
                logger.info("成功连接到TCP服务器 {}:{}", config.getHost(), config.getPort());
                channel = f.channel();
            } else {
                logger.error("连接TCP服务器失败 {}:{}, 5秒后尝试重连...", config.getHost(), config.getPort());
                f.channel().eventLoop().schedule(() -> {
                    try {
                        connect();
                    } catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                    }
                }, 5, TimeUnit.SECONDS);
            }
        });
    }

    /**
     * 发送消息
     * @param message 要发送的消息内容
     */
    public void sendMessage(String message) {
        if (channel != null && channel.isActive()) {
            channel.writeAndFlush(message);
            logger.info("发送消息: {}", message);
        } else {
            logger.warn("TCP连接未建立，消息发送失败: {}", message);
        }
    }

    /**
     * 关闭连接
     */
    @PreDestroy
    public void stop() {
        if (channel != null) {
            channel.close();
        }
        group.shutdownGracefully();
        logger.info("Netty客户端已关闭");
    }

    /**
     * 检查连接状态
     * @return true表示连接正常
     */
    public boolean isConnected() {
        return channel != null && channel.isActive();
    }


}