using CommunityToolkit.Mvvm.Messaging;
using Microsoft.VisualBasic;
using SunlightAggregationTerminal.Models;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Reflection.PortableExecutable;
using System.Text;
using System.Text.Json;
using TouchSocket.Core;
using TouchSocket.Sockets;

namespace SunlightAggregationTerminal.Class
{
    public class TcpServer
    {       
        public static TouchSocket.Sockets.TcpClient tcpClient = new TouchSocket.Sockets.TcpClient();

        public static async void Configuration(string ip, string Name, string Password, string Terminal)
        {
            DataReceived.ServerIP = ip;
            DataReceived.ServerName = Name;
            DataReceived.ServerPassword = Password;
            DataReceived.ServerTerminal = Terminal;

            await TcpClient(tcpClient, DataReceived.ServerIP);
        }

        // 引入发送锁，彻底解决连续发送导致的并发断连问题
        private static readonly SemaphoreSlim _sendLock = new SemaphoreSlim(1, 1);
        public static async void TcpTransmit(string Dat)
        {
            var dat = new DataReceived.Person()
            {
                User = DataReceived.ServerName,
                Password = DataReceived.ServerPassword,
                IP = DataReceived.GetLocalIpSimple(),
                Terminal = DataReceived.ServerTerminal,
                Dat = Dat
            };

            // 使用锁确保同一时间只有一个任务在发送，防止并发写入导致 Socket 异常
            await _sendLock.WaitAsync();

            //发送字符串数据
            try
            {
                await tcpClient.SendAsync(JsonSerializer.Serialize(dat));
            }
            catch (Exception ex)
            {
                MainThread.BeginInvokeOnMainThread(() =>
                {
                    Application.Current!.Windows[0].Page!.DisplayAlertAsync("错误", ex.Message.ToString(), "是");
                });
            }
            finally
            {
                _sendLock.Release(); // 释放锁
            }
        }

        public static async Task TcpClient(TouchSocket.Sockets.TcpClient tcpClient, string ip)
        {
            tcpClient.Connecting = (client, e) => { return EasyTask.CompletedTask; };//即将连接到服务器，此时已经创建socket，但是还未建立tcp
            tcpClient.Connected = (client, e) => 
            {
                TcpServer.TcpTransmit("{\"Command\":\"Log\"}");
                return EasyTask.CompletedTask; 
            };//成功连接到服务器
            tcpClient.Closing = (client, e) => {return EasyTask.CompletedTask; };//即将从服务器断开连接。此处仅主动断开才有效。
            tcpClient.Closed = (client, e) => {return EasyTask.CompletedTask; };//从服务器断开连接，当连接不成功时不会触发。
            #region Tcp客户端使用Received异步委托接收数据
            tcpClient.Received = (client, e) =>
            {
                //从服务器收到信息。但是一般byteBlock和requestInfo会根据适配器呈现不同的值。
                var mes = e.Memory.Span.ToString(Encoding.UTF8);

                DataReceived.Received(mes);
               
                return EasyTask.CompletedTask;
            };
            #endregion

            try
            {
                await tcpClient.SetupAsync(new TouchSocketConfig()
                    .SetSingleStreamDataHandlingAdapter(() => new PeriodPackageAdapter())//以超时周期和包
                    .SetRemoteIPHost(ip)                   
                    .ConfigurePlugins(a =>
                    {
                        a.UseReconnection<TouchSocket.Sockets.TcpClient>(options =>
                        {
                            options.PollingInterval = TimeSpan.FromSeconds(5);
                        });
                    }));

                await tcpClient.ConnectAsync();//调用连接，当连接不成功时，会抛出异常。
            }
            catch (Exception ex)
            {
                MainThread.BeginInvokeOnMainThread(() =>
                {
                    Application.Current!.Windows[0].Page!.DisplayAlertAsync("网络错误", ex.Message.ToString(), "是");           
                });      
            }
        }
    }
}