using System;
using System.Collections;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Security.Cryptography;
using System.Threading;
using System.Runtime.InteropServices;
namespace Login
{
    public class handleClinet
    {
        TcpClient clientSocket;
        string clNo;
        public void startClient(TcpClient inClientSocket, string clineNo)
        {
            this.clientSocket = inClientSocket;
            this.clNo = clineNo;
            Thread ctThread = new Thread(doChat);
            ctThread.Start();
        }
        private void doChat()
        {
            int requestCount = 0;
            byte[] bytesFrom = new byte[10025];
            string dataFromClient = null;
            Byte[] sendBytes = null;
            string serverResponse = null;
            string rCount = null;
            requestCount = 0;
            while ((true))
            {
                try
                {
                    requestCount = requestCount + 1;
                    NetworkStream networkStream = clientSocket.GetStream();
                    networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                    dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                    Console.WriteLine(" >> " + "From client-" + clNo + dataFromClient); //clNo wird mit Username des
                    rCount = Convert.ToString(requestCount);                            // Clients ersetzt.
                    serverResponse = "Server to clinet(" + clNo + ") " + rCount;
                    sendBytes = Encoding.ASCII.GetBytes(serverResponse);
                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();
                    Console.WriteLine(" >> " + serverResponse);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(" >> " + ex.ToString());
                }
            }
        }
    }
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            Console.Title = "Login";
            Console.ForegroundColor = ConsoleColor.Green;
            Console.Write("id: ");
            string id = Console.ReadLine();
            Console.Write("pw: ");
            string pw = ReadPassword();
            while (true)
            {
                if (string.Equals(pw, Password(), StringComparison.OrdinalIgnoreCase) && id == "shadowdriz")
                {
                    Console.WriteLine("Successfully logged in.");
                    System.Threading.Thread.Sleep(1500);
                    Console.Clear();
                    IPAddress ipAddress = Dns.GetHostEntry("localhost").AddressList[0];     //get the local ip
                    TcpListener serverSocket = new TcpListener(ipAddress, 8181);
                    TcpClient clientSocket = default(TcpClient);
                    int counter = 0;
                    serverSocket.Start();
                    Console.WriteLine(">>Server Started. Waiting for Clients to connect.");
                    counter = 0;
                    while (true)
                    {
                        counter += 1;
                        clientSocket = serverSocket.AcceptTcpClient();
                        Console.WriteLine(">> A client just joined the Server. Client Number: " + counter.ToString());
                        handleClinet client = new handleClinet();
                        client.startClient(clientSocket, Convert.ToString(counter));
                    }
                }
                else
                    Console.WriteLine("Fuck off!");
                Form frm = new FuckYou();
                frm.ShowDialog();
                break;
            }
        }
        public static string Password()
        {
            using (MD5 md5 = MD5.Create())
            {
                string password = "";
                string time = DateTime.Now.ToString(), date = DateTime.Now.ToString();
                time = time.Substring(time.LastIndexOf(' ') + 1);
                time = time.Replace(':'.ToString(), "");
                time = time.Remove(time.Length - 2);
                date = date.Remove(date.LastIndexOf(' '));
                date = date.Replace('.'.ToString(), "");
                string username = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
                password = GetMD5Hash(md5, username + " " + time + date);
                return password;
            }
        }
        public static string GetMD5Hash(MD5 md5, string password)
        {
            byte[] data = md5.ComputeHash(Encoding.UTF8.GetBytes(password));
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < data.Length; i++)
            {
                sb.Append(data[i].ToString("x2")); //hexdecimal string
            }
            return sb.ToString();
        }
        public static string ReadPassword()
        {
            StringBuilder sb = new StringBuilder();
            while (true)
            {
                ConsoleKeyInfo cki = Console.ReadKey(true);
                if (cki.Key == ConsoleKey.Enter)
                {
                    Console.WriteLine();
                    break;
                }
                if (cki.Key == ConsoleKey.Backspace)
                {
                    if (sb.Length > 0)
                    {
                        Console.Write("\b\0\b");
                        sb.Length--;
                    }
                    continue;
                }
                Console.Write('*');
                sb.Append(cki.KeyChar);
            }
            return sb.ToString();
        }
    }
}