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

namespace teamwork_api.WinAuth
{
    class Auth
    {
        public List<string> Users { get; set; }
        public Dictionary<string, string> Admins { get; set; }

        public Auth(List<string> users, Dictionary<string, string> admins)
        {
            Users = users;
            Admins = admins;
        }

        private string GetStringWOBlankLines(byte[] buffer)
        {
            for (int i = 0; i < buffer.Length; i++)
            {
                if (buffer[i] == 0x00)
                {
                    buffer[i] = 0x90;
                }
            }
            return ASCIIEncoding.ASCII.GetString(buffer).Replace("?", String.Empty);
        }

        private void TransferClient([Out()] WinClient cl, WinClient cl2)
        {
            cl = cl2;
        }

        private WinClient GetWinClient(TcpListener lis)
        {
            if (lis.Pending())
            {
                return new WinClient(lis.AcceptTcpClient(), "locahost");
            }
            return null;
        }

        private void xListen()
        {
            TcpListener lis = new TcpListener(6005);
            lis.Start();
            while (true)
            {
                if (lis.Pending())
                {
                    TcpClient client = lis.AcceptTcpClient();
                    WinClient winCl = new WinClient(client, "localhost");
                    if (client.Connected)
                    {
                        string arguments = "";
                        using (Stream s = client.GetStream())
                        {
                            byte[] b = new byte[300];
                            s.Read(b, 0, b.Length);
                            arguments = GetStringWOBlankLines(b);
                        }
                        if (arguments.StartsWith("/login")) //unless but we have to make sure that we aren't recieving any other commands.
                        {
                            string user = arguments.Replace("/login ", "").Split(',')[0];
                            string password = arguments.Replace("/login ", "").Split(',')[1];
                            if (Admins.ContainsKey(user) && Admins.ContainsValue(password))
                            {
                                //Transfer the Client to the server
                                //client.Connect("localhost", 10225);
                                winCl.Transfer(10225);
                                TransferClient(GetWinClient(lis), winCl);
                            }
                            else
                            {
                                if (Users.Contains(user))
                                {
                                    //Transfer the Client to the server
                                    //client.Connect("localhost", 10225);
                                    winCl.Transfer(10225);
                                    TransferClient(GetWinClient(lis), winCl);
                                }
                                else
                                {
                                    //Refuse any type of connections from this client
                                    //client.Close();
                                    winCl.Client.Close();
                                    TransferClient(GetWinClient(lis), winCl);
                                }
                            }
                        }
                    }
                }
            }
        }

        public void Run()
        {
            Thread thr = new Thread(new ThreadStart(xListen));
            thr.Start();
        }
    }
}