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

namespace SafeMobileLib
{
    public class UdpServer
    {
        private UdpClient udpClient;
        private Thread listenThread;
        private int port;
        private bool working = false;
        private IPEndPoint sourceEP;

        public UdpServer(int _port)
        {
            udpClient = null;
            port = _port;
            sourceEP = new IPEndPoint(IPAddress.Any, 0);
        }

        public void Start()
        {
            Console.WriteLine("Starting UDP server on port:"+port);
            working = true;
            udpClient = new UdpClient(port);
            listenThread = new Thread(new ThreadStart(Listen));
            listenThread.Start();
        }

        public void Stop()
        {
            Console.WriteLine("Stoping UDP server");
            working = false;

            if (udpClient != null)
            {
                udpClient.Close();
                udpClient = null;
            }

            if (listenThread != null)
            {
                listenThread.Abort();

                listenThread = null;
            }
        }

        private void Listen()
        {
            byte[] data = new byte[65507];
            while (working)
            {
                try
                {
                    data = udpClient.Receive(ref sourceEP);

                    Console.WriteLine("Data recv from :" + sourceEP.Address.ToString());

                    if (this.OnNewDataRecv != null)
                        this.OnNewDataRecv(data, data.Length, sourceEP.Address);
                    if (this.OnNewDataEndPointRecv != null)
                        this.OnNewDataEndPointRecv(data, data.Length, sourceEP);

                }
                catch (Exception ex)
                {
                    Console.WriteLine("ERROR UDPserver recv \n"+ ex.ToString());
                }

            }
        }

        public delegate void dataRecvDel(byte[] data, int dataLen, IPAddress ip);
        public event dataRecvDel OnNewDataRecv;

        public delegate void dataRecvEndPointDel(byte[] data, int dataLen, IPEndPoint ip);
        public event dataRecvEndPointDel OnNewDataEndPointRecv;

        public void Send(byte[] data, int dataLen, IPEndPoint EP)
        {
            if (udpClient != null)
            {
                udpClient.Send(data, dataLen, EP);
            }
            else
            {
                Console.WriteLine("ERRROR sending on UDP to:" + EP.Address.ToString());
            }

        }

    }
}