package com.qyft.ms.device.client;

import cn.hutool.json.JSONUtil;
import com.qyft.ms.device.common.jsonrpc.JsonRpcRequest;
import com.qyft.ms.device.config.TcpConfig;
import com.qyft.ms.device.handler.DeviceMessageHandler;
import com.qyft.ms.device.model.bo.DeviceFeedback;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.json.JsonObjectDecoder;
import io.netty.util.CharsetUtil;
import jakarta.annotation.PostConstruct;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

@Slf4j
@Component
@RequiredArgsConstructor
public class TcpClient {

    private final TcpConfig tcpConfig;

    private final DeviceMessageHandler deviceMessageHandler;

    private final EventLoopGroup group = new NioEventLoopGroup();
    private Channel channel;
    private Bootstrap bootstrap;


    @PostConstruct
    public void init() {
        if (tcpConfig.isEnable()) {
            connect();
        }
    }

    public void connect() {
        try {
            if (bootstrap == null) {
                bootstrap = new Bootstrap();
                bootstrap.group(group)
                        .channel(NioSocketChannel.class)
                        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, tcpConfig.getTimeout())
                        .handler(new ChannelInitializer<>() {
                            @Override
                            protected void initChannel(Channel ch) {
                                ch.pipeline().addLast(new JsonObjectDecoder());
                                ch.pipeline().addLast(deviceMessageHandler);
                                ch.pipeline().addLast(new TcpConnectionHandler());
                            }
                        });
            }

            log.info("尝试连接到TCP服务 {}:{}", tcpConfig.getHost(), tcpConfig.getPort());
            ChannelFuture future = bootstrap.connect(new InetSocketAddress(tcpConfig.getHost(), tcpConfig.getPort()));

            future.addListener((ChannelFutureListener) f -> {
                if (f.isSuccess()) {
                    channel = f.channel();
                    log.info("已链接到TCP服务");
                } else {
                    log.error("无法连接到TCP服务. {}ms后重试...", tcpConfig.getReconnect());
                    f.channel().eventLoop().schedule(this::connect, tcpConfig.getReconnect(), TimeUnit.MILLISECONDS);
                }
            });

        } catch (Exception e) {
            log.error("尝试连接到TCP服务发生意外错误: {}", e.getMessage(), e);
        }
    }

    @Scheduled(fixedRateString = "${tcp.reconnect}")
    public void checkConnection() {
        if (channel == null || !channel.isActive()) {
            log.error("TCP服务链接丢失");
            connect();
        }
    }

    public boolean send(String request) {
        if (channel != null && channel.isActive()) {
            channel.writeAndFlush(Unpooled.copiedBuffer(request, CharsetUtil.UTF_8));
            return true;
        } else {
            log.error("TCP服务未连接，无法发送请求: {}", request);
            return false;
        }
    }

    public DeviceFeedback sendCommand(String method) {
        JsonRpcRequest request = new JsonRpcRequest();
        request.setMethod(method);
        return this.sendCommand(request);
    }

    public DeviceFeedback sendCommand(String method, Map<String, Object> params) {
        JsonRpcRequest request = new JsonRpcRequest();
        request.setMethod(method);
        request.setParams(params);
        return this.sendCommand(request);
    }

    public DeviceFeedback sendCommand(JsonRpcRequest request) {
        if (request.getId() == null) {
            request.setId(UUID.randomUUID().toString());
        }
        CompletableFuture<DeviceFeedback> future = new CompletableFuture<>();
        deviceMessageHandler.responseMap.put(request.getId(), future);
        try {
            if (request.getParams() == null) {
                request.setParams(new HashMap<>());
            }
            request.getParams().put("class", "test");
            String requestJsonStr = JSONUtil.toJsonStr(request);
            log.info("发送TCP指令（同步） {}", requestJsonStr);
            if (this.send(requestJsonStr)) {
                return future.get(tcpConfig.getFeedbackTimeout(), TimeUnit.MILLISECONDS); // 等待 FEEDBACK 响应
            } else {
                return null;
            }
        } catch (Exception e) {
            log.error("发送TCP指令错误（同步） {}", JSONUtil.toJsonStr(request), e);
        } finally {
            deviceMessageHandler.responseMap.remove(request.getId()); //确保完成后移除
        }
        return null;
    }

    private class TcpConnectionHandler extends ChannelInboundHandlerAdapter {

        @Override
        public void channelInactive(ChannelHandlerContext ctx) throws Exception {
            // 连接断开时的处理逻辑
            log.error("TCP连接丢失，准备重新连接...");
            if (channel != null) {
                channel.close();
            }
            connect();
            super.channelInactive(ctx);
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
            log.error("TCP连接发生异常: {}", cause.getMessage(), cause);
            ctx.close();
        }
    }
}