using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using UnityEngine;
using UnityEngine.UI;

public class TouchClient : MonoBehaviour
{
    private TcpClient client; // 用于与显示端通信的TCP客户端
    private NetworkStream stream; // 用于发送/接收数据的流
    private volatile bool isConnected = false; // 线程安全的连接状态标志

    private UdpClient udpListener; // 用于接收广播IP的UDP客户端
    private Thread udpThread; // 监听广播的线程
    private CancellationTokenSource udpCts = new CancellationTokenSource(); // 控制UDP线程取消

    private Thread receiveThread; // 接收服务器消息的线程
    private CancellationTokenSource receiveCts = new CancellationTokenSource(); // 控制接收线程取消

    public Transform background; // UI页面的父级变换
    private string currentPage = "首页"; // 跟踪当前显示的页面

    private readonly Queue<float> progressQueue = new Queue<float>(); // 线程安全的进度队列
    private readonly object queueLock = new object(); // 进度队列访问锁
    private bool isDraggingSlider = false; // 标记是否正在拖动Slider

    // 脚本启动时调用
    void Start()
    {
        // 设置触摸控制端分辨率为 1920x1080
        Screen.SetResolution(1920, 1080, false);

        // 在端口9999上初始化UDP监听
        udpListener = new UdpClient(9999);
        udpThread = new Thread(() => ListenForBroadcast(udpCts.Token));
        udpThread.Start();

        Debug.Log("触摸端等待显示端广播...");

        // 显示初始页面
        ShowPage("首页");
    }

    // 监听UDP广播以发现显示端IP
    private void ListenForBroadcast(CancellationToken token)
    {
        IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 9999);

        // 在未连接或未取消的情况下持续监听
        while (!isConnected && !token.IsCancellationRequested)
        {
            try
            {
                // 接收广播数据
                byte[] data = udpListener.Receive(ref endPoint);
                string serverIp = Encoding.UTF8.GetString(data);

                Debug.Log("发现显示端IP: " + serverIp);
                ConnectToServer(serverIp, 8888); // 尝试连接到服务器
            }
            catch (Exception ex)
            {
                Debug.LogError($"UDP接收错误: {ex.Message}");
                Thread.Sleep(1000); // 避免快速重试
            }
        }
    }

    // 通过TCP连接到显示端服务器
    private void ConnectToServer(string ip, int port)
    {
        try
        {
            client = new TcpClient();
            client.Connect(ip, port); // 连接到服务器
            stream = client.GetStream();
            isConnected = true;
            udpCts.Cancel(); // 连接成功后停止UDP监听线程
            udpListener?.Close(); // 关闭UDP监听器
            Debug.Log("触摸端已连接到显示端: " + ip);

            // 启动接收线程以处理服务器消息
            receiveThread = new Thread(() => ReceiveMessages(receiveCts.Token));
            receiveThread.Start();
        }
        catch (Exception ex)
        {
            Debug.LogError($"连接显示端失败: {ex.Message}");
        }
    }

    // 接收服务器发送的消息
    private void ReceiveMessages(CancellationToken token)
    {
        byte[] message = new byte[4096];
        int bytesRead;

        while (!token.IsCancellationRequested && isConnected)
        {
            try
            {
                bytesRead = stream.Read(message, 0, 4096);
                if (bytesRead == 0) break; // 服务器断开连接

                string data = Encoding.UTF8.GetString(message, 0, bytesRead);
                if (data.StartsWith("Progress:") && float.TryParse(data.Replace("Progress:", ""), out float progress))
                {
                    lock (queueLock)
                    {
                        progressQueue.Clear(); // 清空队列以确保最新进度
                        progressQueue.Enqueue(progress); // 将进度加入队列
                        Debug.Log($"收到进度: {progress:F2}");
                    }
                }
            }
            catch (Exception ex)
            {
                Debug.LogError($"接收服务器消息错误: {ex.Message}");
                isConnected = false;
                break;
            }
        }
    }

    // 向显示端服务器发送消息
    private void SendMessageToServer(string msg)
    {
        if (isConnected && stream != null)
        {
            try
            {
                byte[] data = Encoding.UTF8.GetBytes(msg);
                stream.Write(data, 0, data.Length);
                Debug.Log("发送指令: " + msg);
            }
            catch (Exception ex)
            {
                Debug.LogError($"发送消息失败: {ex.Message}");
                isConnected = false; // 标记连接失效
            }
        }
    }

    // 页面按钮点击时调用
    public void OnButtonClick_Page(string pageName)
    {
        ShowPage(pageName); // 切换到指定页面
        SendMessageToServer("Page:" + pageName); // 通知服务器
    }

    // 模型播放按钮点击时调用
    public void OnButtonClick_PlayModel(string modelName)
    {
        SendMessageToServer("Model:" + modelName); // 通知服务器播放模型
    }

    // 滑块值改变时调用
    public void OnSliderChanged(Slider slider)
    {
        isDraggingSlider = true; // 标记正在拖动
        float progress = slider.value / 100f; // 转换为0-1
        SendMessageToServer("Progress:" + progress.ToString("F2")); // 发送进度
        Debug.Log($"Slider拖动到: {progress:F2}");
    }

    // 滑块拖动结束时调用（需在Inspector中绑定）
    public void OnSliderEndDrag()
    {
        isDraggingSlider = false; // 结束拖动
        Debug.Log("Slider拖动结束");
    }

    // 获取当前页面的Slider组件
    private Slider GetCurrentPageSlider()
    {
        if (background == null || currentPage == "首页") return null;

        Transform pageTransform = background.Find(currentPage);
        if (pageTransform != null)
        {
            Slider slider = pageTransform.GetComponentInChildren<Slider>();
            if (slider != null)
            {
                if (!slider.interactable)
                {
                    slider.interactable = true; // 确保Slider可交互
                    Debug.Log($"启用Slider交互: {currentPage}");
                }
                return slider;
            }
            Debug.LogWarning($"未在页面 {currentPage} 找到Slider");
            return null;
        }
        Debug.LogWarning($"未找到页面 {currentPage}");
        return null;
    }

    // 切换激活的UI页面
    private void ShowPage(string pageName)
    {
        foreach (Transform child in background)
        {
            child.gameObject.SetActive(child.name == pageName); // 仅激活目标页面
        }
        currentPage = pageName;

        // 清空进度队列以避免旧页面数据干扰
        lock (queueLock)
        {
            progressQueue.Clear();
        }

        // 初始化当前页面的Slider
        Slider slider = GetCurrentPageSlider();
        if (slider != null)
        {
            slider.value = 0f; // 重置Slider到0
            slider.interactable = true; // 确保可交互
            // 绑定OnValueChanged事件
            slider.onValueChanged.RemoveAllListeners();
            slider.onValueChanged.AddListener((value) => OnSliderChanged(slider));
            Debug.Log($"初始化Slider: {pageName}, 值: {slider.value}");
        }

        Debug.Log($"切换到页面: {pageName}, Slider {(slider != null ? "找到" : "未找到")}");
    }

    // 在主线程中更新Slider进度
    private void Update()
    {
        if (isDraggingSlider) return; // 拖动时忽略服务器进度

        float progress = 0f;
        lock (queueLock)
        {
            if (progressQueue.Count > 0)
            {
                progress = progressQueue.Dequeue(); // 获取最新进度
            }
        }

        if (progress >= 0f)
        {
            Slider slider = GetCurrentPageSlider();
            if (slider != null)
            {
                slider.value = progress * 100f; // 更新Slider值（0-100）
                Debug.Log($"更新Slider进度: {progress:F2}, Slider值: {slider.value}");
            }
        }
    }

    // 应用程序退出时清理资源
    private void OnApplicationQuit()
    {
        udpCts.Cancel(); // 通知UDP线程停止
        receiveCts.Cancel(); // 通知接收线程停止
        if (udpThread != null && udpThread.IsAlive)
        {
            udpThread.Join(1000); // 等待UDP线程结束
        }
        if (receiveThread != null && receiveThread.IsAlive)
        {
            receiveThread.Join(1000); // 等待接收线程结束
        }
        udpListener?.Close(); // 关闭UDP监听器
        stream?.Close(); // 关闭TCP流
        client?.Close(); // 关闭TCP客户端
    }
}