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

namespace formula_manage.UserClass
{
    public class TCPServer
    {

        //第一步：调用socket()函数创建一个用于通信的套接字
        public static Socket listenSocket;

        //字典集合：存储IP和Socket的集合
        public static Dictionary<string, Socket> OnLineList = new Dictionary<string, Socket>();

            //当前时间
            private string CurrentTime
            {
                get { return DateTime.Now.ToString("HH:mm:ss") + Environment.NewLine; }
            }

            //编码格式
            Encoding econding = Encoding.Default;


            public static void  Start()
            {
                //第一步：调用socket()函数创建一个用于通信的套接字
                listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                //第二步：给已经创建的套接字绑定一个端口号，这一般通过设置网络套接口地址和调用Bind()函数来实现
                IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), int.Parse("11080"));

                try
                {
                    listenSocket.Bind(endPoint);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("服务器开启失败：" + ex.Message, "开启服务器");
                    return;
                }

                //第三步：调用listen()函数使套接字成为一个监听套接字
                listenSocket.Listen(10);

            //ShowMessage("服务器开启成功");
            MessageBox.Show("服务器开启成功");
                //开启一个线程监听
                Task.Run(new Action(() =>
                {
                    ListenConnection();
                }
                ));

            }

        public static void ListenConnection()
            {
                while (true)
                {
                    Socket clientSocket = listenSocket.Accept();

                    string ip = clientSocket.RemoteEndPoint.ToString();

                    //更新在线列表
                 //   AddOnLine(ip, true);
                    //更新在线列表集合
                    OnLineList.Add(ip, clientSocket);

                   // ShowMessage(ip + "上线了");

                    Task.Run(() => ReceiveMsg(clientSocket));

                }

            }


        /// <summary>
        /// 接收方法
        /// </summary>
        /// <param name="clientSocket"></param>
        public static void ReceiveMsg(Socket clientSocket)
            {
                while (true)
                {
                    //定义一个2M的缓冲区
                    byte[] buffer = new byte[1024 * 1024 * 2];

                    int length = -1;
                    try
                    {
                        length = clientSocket.Receive(buffer);
                    }
                    catch (Exception)
                    {

                        //客户端下线了

                        //更新在线列表
                        string ip = clientSocket.RemoteEndPoint.ToString();

                     //   AddOnLine(ip, false);

                        OnLineList.Remove(ip);

                        break;
                    }

                    if (length == 0)
                    {
                        //客户端下线了

                        //更新在线列表
                        string ip = clientSocket.RemoteEndPoint.ToString();

                    //    AddOnLine(ip, false);

                        OnLineList.Remove(ip);

                        break;
                    }


                  //  if (length > 0)
               //     {
                //        string info = econding.GetString(buffer, 0, length);
                       // ShowMessage(info);
              //      }
                }
            }
/*
            /// <summary>
            /// 在线列表更新
            /// </summary>
            /// <param name="clientIp"></param>
            /// <param name="value"></param>
            private void AddOnLine(string clientIp, bool value)
            {
                Invoke(new Action(() =>
                {
                    if (value)
                    {
                        this.lst_Online.Items.Add(clientIp);
                    }
                    else
                    {
                        this.lst_Online.Items.Remove(clientIp);
                    }

                }));

            }


            /// <summary>
            /// 更新接收区
            /// </summary>
            /// <param name="info"></param>
            private void ShowMessage(string info)
            {
                Invoke(new Action(() =>
                {
                    this.txt_Rcv.AppendText(CurrentTime + info + Environment.NewLine);
                }));

            }
*/
/*
            /// <summary>
            /// 消息发送
            /// </summary>
            /// <param name="sender"></param>
            /// <param name="e"></param>
            private void btn_Send_Click(object sender, EventArgs e)
            {
                if (this.lst_Online.SelectedItem != null)
                {
                    foreach (string item in this.lst_Online.SelectedItems)
                    {
                        if (OnLineList.ContainsKey(item))
                        {
                            OnLineList[item].Send(econding.GetBytes(this.txt_Send.Text.Trim()));
                        }
                    }
                }
                else
                {
                    MessageBox.Show("请先选择要发送的对象", "发送消息");
                }

            }

            /// <summary>
            /// 群发功能
            /// </summary>
            /// <param name="sender"></param>
            /// <param name="e"></param>
            private void btn_SendAll_Click(object sender, EventArgs e)
            {
                foreach (string item in this.lst_Online.Items)
                {
                    if (OnLineList.ContainsKey(item))
                    {
                        OnLineList[item].Send(econding.GetBytes(this.txt_Send.Text.Trim()));
                    }
                }
            }*/
        
    }
}