using HslCommunication;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace UAS_MES_NEW.FunctionCode.Make
{
    public partial class Make_SocketClient : Form
    {
        public Make_SocketClient()
        {
            InitializeComponent();
        }

        string saveFile, sendFile;

        SocketHandle client;

        private async void Make_SocketClient_Load(object sender, EventArgs e)
        {
            string currentPath = Directory.GetParent(AppDomain.CurrentDomain.BaseDirectory).FullName;
            saveFile = Path.Combine(currentPath, $"Received.txt");
            sendFile = Path.Combine(currentPath, $"Send.txt");

            client = new SocketHandle("127.0.0.1", 9979);
            client.OnFileReceived += OnFileReceived;
            client.OnMessageReceived += OnMessageReceived;
            client.OnConnectionStatusChanged += OnConnectionStatusChanged;

            string msg = await client.ConnectAsync();
            if (!msg.StartsWith("OK"))
            {
                ShowMsg(0, msg);
            }
            ShowMsg(1, msg);

            msg = await client.ReceiveFileAsync(saveFile);
            if (!msg.StartsWith("OK"))
            {
                ShowMsg(0, msg);
            }
            ShowMsg(1, msg);
        }

        private async void OnFileReceived(string fileName, string savePath)
        {
            ShowMsg(1, "文件接收完成: " + fileName + " 保存到: " + savePath);
            string msg = await client.SendFileAsync(sendFile);
            if (msg.StartsWith("NG"))
            {
                ShowMsg(0, msg);
            }
            ShowMsg(1, "文件发送成功");
        }

        private void OnMessageReceived(string message)
        {
            ShowMsg(1, "收到服务器消息: " + message);
        }

        private void OnConnectionStatusChanged(string status)
        {
            ShowMsg(0, "连接状态已变: " + status);
        }


        private void ShowMsg(int type, string msg)
        {
            msg = msg.Replace("\r", "").Replace("\n", "");
            string msgTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
            string showMsg = $"{msgTime}: {msg}\n";
            if (type == 0)
            {
                //OperatResult.AppendText(showMsg, Color.Red);
            }
            else if (type == 1)
            {
                //OperatResult.AppendText(showMsg, Color.Green);
            }
        }

        public class SocketHandle
        {
            private Socket clientSocket;
            private string serverIP;
            private int serverPort;
            private bool isConnected = false;

            public event Action<string, string> OnFileReceived;
            public event Action<string> OnMessageReceived;
            public event Action<string> OnConnectionStatusChanged;

            public SocketHandle(string ip, int port)
            {
                serverIP = ip;
                serverPort = port;
                clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            }

            public async Task<string> ConnectAsync()
            {
                try
                {
                    IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(serverIP), serverPort);
                    await Task.Factory.FromAsync(
                        clientSocket.BeginConnect,
                        clientSocket.EndConnect,
                        endPoint,
                        null);
                    isConnected = true;
                    if (OnConnectionStatusChanged != null)
                    {
                        OnConnectionStatusChanged("连接成功");
                    }
                    StartListeningAsync();

                    return "OK,连接成功";
                }
                catch (Exception ex)
                {
                    return $"NG,连接失败: {ex.Message}";
                }
            }

            private async void StartListeningAsync()
            {
                while (isConnected)
                {
                    try
                    {
                        byte[] lengthBytes = new byte[4];
                        int receivedLength = await ReceiveDataAsync(lengthBytes, 0, lengthBytes.Length);

                        if (receivedLength == 0) // 连接已断开
                        {
                            isConnected = false;
                            if (OnConnectionStatusChanged != null)
                            {
                                OnConnectionStatusChanged("连接已断开");
                            }
                            break;
                        }

                        int messageLength = BitConverter.ToInt32(lengthBytes, 0);

                        // 接收消息内容
                        byte[] messageBytes = new byte[messageLength];
                        await ReceiveDataAsync(messageBytes, 0, messageLength);
                        string message = Encoding.UTF8.GetString(messageBytes);

                        // 根据消息类型触发不同事件
                        ProcessMessage(message);
                    }
                    catch (Exception ex)
                    {
                        isConnected = false;
                        break;
                    }
                }
            }
            private void ProcessMessage(string message)
            {
                if (message.StartsWith("[FILE_TRANSFER]"))
                {
                    if (OnMessageReceived != null)
                    {
                        OnMessageReceived("服务器准备发送文件: " + message.Substring(15));
                    }
                }
                else
                {
                    if (OnMessageReceived != null)
                    {
                        OnMessageReceived(message);
                    }
                }
            }

            public async Task<string> SendFileAsync(string filePath)
            {
                if (!isConnected)
                {
                    return "NG,未连接到服务器";
                }

                if (!File.Exists(filePath))
                {
                    return "NG,文件不存在: " + filePath;
                }

                try
                {
                    FileInfo fileInfo = new FileInfo(filePath);
                    string fileName = fileInfo.Name;
                    long fileSize = fileInfo.Length;

                    // 发送文件头信息 (文件名长度 + 文件名 + 文件大小)
                    byte[] fileNameBytes = Encoding.UTF8.GetBytes(fileName);
                    byte[] fileNameLengthBytes = BitConverter.GetBytes(fileNameBytes.Length);
                    byte[] fileSizeBytes = BitConverter.GetBytes(fileSize);

                    // 组合发送数据
                    byte[] header = new byte[fileNameLengthBytes.Length + fileNameBytes.Length + fileSizeBytes.Length];
                    Array.Copy(fileNameLengthBytes, 0, header, 0, fileNameLengthBytes.Length);
                    Array.Copy(fileNameBytes, 0, header, fileNameLengthBytes.Length, fileNameBytes.Length);
                    Array.Copy(fileSizeBytes, 0, header, fileNameLengthBytes.Length + fileNameBytes.Length, fileSizeBytes.Length);

                    await SendDataAsync(header);

                    // 发送文件内容
                    using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                    {
                        byte[] buffer = new byte[4096];
                        int bytesRead;
                        while ((bytesRead = await fileStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
                        {
                            await SendDataAsync(buffer, 0, bytesRead);
                        }
                    }

                    return "OK,发送文件成功";
                }
                catch (Exception ex)
                {
                    return "NG,发送文件失败: " + ex.Message;
                }
            }

            public async Task<string> ReceiveFileAsync(string savePath)
            {
                if (!isConnected)
                {
                    return "NG,未连接到服务器";
                }

                try
                {
                    // 接收文件头信息
                    byte[] fileNameLengthBytes = new byte[4];
                    await ReceiveDataAsync(fileNameLengthBytes, 0, fileNameLengthBytes.Length);
                    int fileNameLength = BitConverter.ToInt32(fileNameLengthBytes, 0);

                    byte[] fileNameBytes = new byte[fileNameLength];
                    await ReceiveDataAsync(fileNameBytes, 0, fileNameLength);
                    string fileName = Encoding.UTF8.GetString(fileNameBytes);

                    //byte[] fileSizeBytes = new byte[8];
                    byte[] fileSizeBytes = new byte[4];
                    await ReceiveDataAsync(fileSizeBytes, 0, fileSizeBytes.Length);
                    long fileSize = BitConverter.ToInt64(fileSizeBytes, 0);

                    // 确保保存目录存在
                    string directory = Path.GetDirectoryName(savePath);
                    if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
                    {
                        Directory.CreateDirectory(directory);
                    }

                    // 接收文件内容
                    using (FileStream fileStream = new FileStream(savePath, FileMode.Create, FileAccess.Write))
                    {
                        byte[] buffer = new byte[4096];
                        long totalReceived = 0;

                        while (totalReceived < fileSize)
                        {
                            int toRead = (int)Math.Min(buffer.Length, fileSize - totalReceived);
                            int received = await ReceiveDataAsync(buffer, 0, toRead);
                            if (received <= 0)
                            {
                                break;
                            }
                            await fileStream.WriteAsync(buffer, 0, received);
                            totalReceived += received;
                        }
                    }

                    if (OnFileReceived != null)
                    {
                        OnFileReceived(fileName, savePath);
                    }
                    return "OK,接收文件成功";
                }
                catch (Exception ex)
                {
                    return "NG,接收文件失败: " + ex.Message;
                }
            }

            public async Task<string> SendMessageAsync(string message)
            {
                if (!isConnected)
                {
                    return "NG,未连接到服务器";
                }
                try
                {
                    byte[] messageBytes = Encoding.UTF8.GetBytes(message);
                    byte[] lengthBytes = BitConverter.GetBytes(messageBytes.Length);

                    await SendDataAsync(lengthBytes);
                    await SendDataAsync(messageBytes);
                    return "OK,发送消息成功";
                }
                catch (Exception ex)
                {
                    return "NG,发送消息失败: " + ex.Message;
                }
            }

            public async Task<string> ReceiveMessageAsync()
            {
                try
                {
                    // 先接收消息长度
                    byte[] lengthBytes = new byte[4];
                    await ReceiveDataAsync(lengthBytes, 0, lengthBytes.Length);
                    int messageLength = BitConverter.ToInt32(lengthBytes, 0);

                    // 接收消息内容
                    byte[] messageBytes = new byte[messageLength];
                    await ReceiveDataAsync(messageBytes, 0, messageLength);

                    return "OK," + Encoding.UTF8.GetString(messageBytes);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("接收消息失败: " + ex.Message);
                    return null;
                }
            }

            private async Task SendDataAsync(byte[] data)
            {
                await SendDataAsync(data, 0, data.Length);
            }

            private async Task SendDataAsync(byte[] data, int offset, int size)
            {
                await Task.Factory.FromAsync((callback, state) =>
                    clientSocket.BeginSend(data, offset, size, SocketFlags.None, callback, state),
                    clientSocket.EndSend,
                    null);
            }

            private async Task<int> ReceiveDataAsync(byte[] data, int offset, int size)
            {
                return await Task.Factory.FromAsync((callback, state) =>
                    clientSocket.BeginReceive(data, offset, size, SocketFlags.None, callback, state),
                    clientSocket.EndReceive,
                    null);
            }

            public void Close()
            {
                isConnected = false;
                if (clientSocket != null && clientSocket.Connected)
                {
                    clientSocket.Shutdown(SocketShutdown.Both);
                    clientSocket.Close();
                }
            }
        }
    }
}