using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace BlackjackClient
{
    class Program
    {
        // hostname of the server
        public const string HOST_NAME = "server.allcatsaregrey.co.uk";

        static void Main(string[] args)
        {
            //ask the user their name for use further in the program
            Console.WriteLine("Please enter your name:");

            //declare a username string from what the user has entered
            string userName = Console.ReadLine();

            //clear the console to start the gameplay
            Console.Clear();

            //connect to the server
            try
            {
                //define the remote IP address and port number
                IPAddress ipAddress = Dns.GetHostAddresses(HOST_NAME)[0];
                IPEndPoint remoteEndPoint = new IPEndPoint(ipAddress, 26260);

                //create a new TCP/IP socket and connect to the remote endpoint
                Socket server = new Socket(SocketType.Stream, ProtocolType.Tcp);
                server.Connect(remoteEndPoint);

                //when the client has connected to the server, tell them
                Console.WriteLine("Connected to server.");

                //receive the player's total from the server
                byte[] playerTotalData = new byte[1024];
                int bytesReceived = server.Receive(playerTotalData);
                int playerTotal = int.Parse(Encoding.ASCII.GetString(playerTotalData, 0, bytesReceived));

                //let the user know the total of their cards
                Console.WriteLine("\n" + userName + " , your cards add up to {0}.", playerTotal);

                //close client if server disconnects
                if (!server.Connected)
                {
                    Console.WriteLine("Connection lost.");

                    //wait for 3 seconds before closing the console
                    Thread.Sleep(3000);
                    //close the console application
                    Environment.Exit(0);
                }

                //loop to understand the user's decision 
                while (true)
                {
                    //code for if the player has scored more than 21
                    if (playerTotal > 21)
                    {
                        Console.WriteLine("\nUnlucky" + userName + ", your score is over 21. Dealer wins!");
                        Console.WriteLine("Please press any key to stop.");
                        Console.ReadKey();
                        Environment.Exit(0);
                    }

                    //ask the user if they want to hit or stand
                    Console.Write("Hit or Stand? ");

                    //convert what they have said to uppercase
                    string hitStand = Console.ReadLine().ToUpper();

                    //if the user wants to hit, send this decision to the server
                    if (hitStand == "HIT")
                    {
                        //send HIT to the server
                        byte[] hitStandData = Encoding.ASCII.GetBytes(hitStand);
                        server.Send(hitStandData);

                        //check to see if the server has closed the connection
                        if (server.Poll(1000, SelectMode.SelectRead) && server.Available == 0)
                        {
                            //alert the user that the connection has been lost
                            Console.WriteLine("Connection lost.");

                            //wait for 3 seconds before closing the console
                            Thread.Sleep(3000);
                            //close the console application
                            Environment.Exit(0);
                        }

                        //receive the player's new total from the server
                        playerTotalData = new byte[1024];
                        bytesReceived = server.Receive(playerTotalData);
                        playerTotal = int.Parse(Encoding.ASCII.GetString(playerTotalData, 0, bytesReceived));

                        //alert the player of their new total
                        Console.WriteLine("\n" + userName + ", Your cards add up to {0}.", playerTotal);

                    }

                    else if (hitStand == "STAND")
                    {
                        //if the user has decided to stand, send STAND to the server
                        byte[] hitStandData = Encoding.ASCII.GetBytes(hitStand);
                        server.Send(hitStandData);

                        //check if the server has closed the connection
                        if (server.Poll(1000, SelectMode.SelectRead) && server.Available == 0)
                        {
                            //alert the user that the connection has been lost
                            Console.WriteLine("Connection lost.");

                            //wait for 3 seconds before closing the console
                            Thread.Sleep(3000);
                            //close the console application
                            Environment.Exit(0);
                        }

                        //receive the dealer's total from the server
                        byte[] DealerTotalData = new byte[1024];
                        bytesReceived = server.Receive(DealerTotalData);
                        string totalOfDealer = Encoding.ASCII.GetString(DealerTotalData, 0, bytesReceived);

                        //tell the user what the dealer has got
                        Console.WriteLine("\nThe dealer has got {0}!", totalOfDealer);

                        //receive the winner from the server
                        byte[] winnerData = new byte[1024];
                        bytesReceived = server.Receive(winnerData);
                        string winner = Encoding.ASCII.GetString(winnerData, 0, bytesReceived);

                        //tell the user who has won
                        Console.WriteLine("\nThe winner is the {0}!", winner);

                        //messages the user a congratulatory message if they have won
                        if (winner == "PLAYER")
                        {
                            Console.WriteLine("\nWell Done " + userName + "!");
                        }

                        //messages the user unlucky, if they have lost or tied with the dealer
                        else
                        {
                            Console.WriteLine("\n Unlucky " + userName);
                        }

                        //when the game has stopped, tell the user that they have to press any key for the game to stop
                        Console.WriteLine("\nPlease press any key to stop.");
                        Console.ReadKey();
                        Environment.Exit(0);
                    }
                }

                //close the socket
                server.Shutdown(SocketShutdown.Both);
                server.Close();

            }
            catch (Exception e)
            {
                //if the server is not active, alert the user and close the client
                Console.WriteLine("Server is not active");
                Console.WriteLine("The client will now close");
                Thread.Sleep(4000);

                Environment.Exit(0);
            }
        }
    }
}