using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;

namespace XdCxRhDW.App
{
    class TcpServer
    {
        private TcpListener listener;
        public event Action<byte[]> OnDataReceived;
        public void Start(int port, string ip = null)
        {
            Task.Run(() =>
            {
                if (string.IsNullOrWhiteSpace(ip))
                {
                    listener = new TcpListener(IPAddress.Any, port);
                }
                else
                {
                    listener = new TcpListener(IPAddress.Parse(ip), port);
                }
                listener.Start();
            L1:
                TcpClient client = null;
                try
                {
                     client = listener.AcceptTcpClient();
                }
                catch (Exception ex)
                {
                    return;
                }
                while (true)
                {
                    try
                    {
                        var stream = client.GetStream();
                        byte[] lenData = new byte[4];
                        int readLen = stream.Read(lenData, 0, 4);
                        if (readLen == 0)
                            goto L1;
                        byte[] data = new byte[BitConverter.ToInt32(lenData, 0)];
                        readLen = stream.Read(data, 0, data.Length);
                        if (readLen == 0)
                            goto L1;
                        OnDataReceived?.Invoke(data);
                    }
                    catch (Exception ex)
                    {
                        goto L1;
                    }
                }
            });
        }


        public void StopListening()
        {
            listener?.Stop();
            listener = null;
        }
    }
}