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

namespace Simulator
{
    class CTRL
    {
        private TCPServer tcp;
        private int tcp_port;

        public static string udpIP;
        public static int udpPort;

        private NetworkStream ns;
        System.Threading.Timer ping_timer;

        private static ArrayList unitlist = new ArrayList();

        public CTRL(int tcpport)
        {
            tcp_port = tcpport;        



            tcp = new TCPServer();
            tcp.OnConnectionRecv += new TCPServer.ConnectionRecv(tcp_OnConnectionRecv);
            tcp.OnConnectionEnded += new TCPServer.ConnectionEnded(tcp_OnConnectionEnded);
            tcp.OnMessageRecv += new TCPServer.MessageRecv(tcp_OnMessageRecv);
            tcp.Start(tcp_port);
        }

        void tcp_OnConnectionRecv(System.Net.Sockets.NetworkStream ns, string IP)
        {
            try
            {
                this.ns = ns;
                Console.WriteLine("GW with IP:" + IP + " Connected");
                //start ping timer
                ping_timer = new System.Threading.Timer(PingGW, null, 0, 10000);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

            
            // file read
            unitlist = new ArrayList();
            try
            {
                using (StreamReader sr = new StreamReader("dataGPS.txt"))
                {
                    String line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        String[] tmp = line.Split('#');
                        Unit u = new Unit(tmp[1], Int32.Parse(tmp[2]), ns);
                        u.Start();
                        unitlist.Add(u);
                        Thread.Sleep(23);
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.ToString());
            }
             
        }
        void tcp_OnConnectionEnded(string IP)
        {
            try
            {
                
                Console.WriteLine("GW with IP:" + IP + " Disconnect");
                this.ns = null;
                ping_timer = null;

                if (unitlist != null)
                {
                    for (int i = 0; i < unitlist.Count; i++)
                    {
                        if ((Unit)unitlist[i] != null)
                        {
                            ((Unit)unitlist[i]).Stop();
                            unitlist[i] = null;
                        }

                    }
                    unitlist = null;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        void tcp_OnMessageRecv(byte[] data, int recv, System.Net.Sockets.NetworkStream ns)
        {
            try
            {
                if (recv == 12)
                {
                    if ((data[4] == 0x50) && (data[6] == 0x4f))
                    {
                        //Pong received
                        Console.WriteLine("Pong recv");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("tcp_OnMessageRecv:" + ex.ToString());
            }
        }

        private void PingGW(Object state)
        {
            try
            {
                Console.WriteLine("Send PING");
                byte[] msg = new byte[12];
                //length
                msg[0] = 0x00;
                msg[1] = 0x0a;
                // message ID
                msg[2] = 0xff;
                // body length
                msg[3] = 0x08;
                //PONG -utf16 LE string
                //P
                msg[4] = 0x50;
                msg[5] = 0x00;
                //I
                msg[6] = 0x49;
                msg[7] = 0x00;
                //N
                msg[8] = 0x4e;
                msg[9] = 0x00;
                //G
                msg[10] = 0x47;
                msg[11] = 0x00;

                if(tcp !=null && ns != null)
                    TCPServer.Send(msg, msg.Length, ns);
            }
            catch (Exception ex)
            {
                Console.WriteLine("ERROR in PingGW:\n" + ex.ToString());
            }
        }
    }
}