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

namespace ServerSocket
{
    class Program
    {
        public static string GetLocalIPAddress()
        {
            var host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (var ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    return ip.ToString();
                }
            }
            throw new Exception("No network adapters with an IPv4 address in the system!");
        }
        static void Main(string[] args)
        {
            try
            {
                IPAddress IP = IPAddress.Parse(GetLocalIPAddress());
                int PORT = 8888;
                string FILE_EXEC = "exec.bat";

                for (int i = 0; i < args.Length; i++)
                {
                    string[] arg = args[i].Split(':');
                    string a = arg[0].Replace("\"", "").Trim();
                    string b = arg[1].Replace("\"", "").Trim();
                    switch (a)
                    {
                        case "-p":
                            int.TryParse(b, out PORT);
                            break;
                        case "-f":
                            FILE_EXEC = b;
                            break;
                        default:
                            break;
                    }
                }



                TcpListener myList = new TcpListener(IP, PORT);

                /* Start Listeneting at the specified port */
                myList.Start();

                Console.WriteLine("The server is running at port {0}...",PORT);
                Console.WriteLine("The local End point is  :" +
                                  myList.LocalEndpoint);
                Console.WriteLine("Waiting for a connection.....");


                while (true)
                {
                    Socket s = myList.AcceptSocket();
                    string RemoteEndPoint = ""+s.RemoteEndPoint;
                    Console.WriteLine("[{0}] is Connected..", RemoteEndPoint);
                    byte[] b = new byte[100];
                    int k = s.Receive(b);
                    string receive = "";
                    for (int i = 0; i < k; i++)
                        receive += Convert.ToChar(b[i]);
                    Console.WriteLine("[{0}] Has Sent: {1}", RemoteEndPoint, receive);

                    System.Diagnostics.ProcessStartInfo ProcStartInfo = new System.Diagnostics.ProcessStartInfo(FILE_EXEC);
                    ProcStartInfo.RedirectStandardOutput = true;
                    ProcStartInfo.UseShellExecute = false;
                    ProcStartInfo.CreateNoWindow = false;
                    ProcStartInfo.RedirectStandardError = true;
                    System.Diagnostics.Process MyProcess = new System.Diagnostics.Process();
                    ProcStartInfo.Arguments = "ServerSocket";
                    MyProcess.StartInfo = ProcStartInfo;
                    MyProcess.Start();
                    string output = MyProcess.StandardOutput.ReadToEnd();
                    MyProcess.WaitForExit();
                    ASCIIEncoding asen = new ASCIIEncoding();
                    s.Send(asen.GetBytes(output));
                    s.Close();
                    Console.WriteLine("[{0}] Connection Closed", RemoteEndPoint);
                }

                /* clean up */

                //myList.Stop();

            }
            catch (Exception e)
            {
                Console.WriteLine("Error..... " + e.StackTrace);
                Environment.Exit(1);
            }
        }
    }
}