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

internal class Program
{
    //hostname of the server
    public const string HOST_NAME = "server.allcatsaregrey.co.uk";
    //port number
    public const int PORT_NUMBER = 26260;

    private static void Main(string[] args)
    {
        //generate random number
        Random random = new Random();

        //start up the server
        try
        {
            //define the local IP address and port number - port 26260
            IPAddress ipAddress = Dns.GetHostAddresses(HOST_NAME)[0];
            IPEndPoint localEndPoint = new IPEndPoint(ipAddress, PORT_NUMBER);

            //create a new TCP/IP socket and bind it to the local endpoint
            Socket server = new Socket(SocketType.Stream, ProtocolType.Tcp);
            server.Bind(localEndPoint);
            server.Listen(1);

            //write stating that the server has started and there is no client yet
            Console.WriteLine("Server started. Waiting for a client...");

            //wait for a client to connect
            Socket client = server.Accept();

            //once they have connected state that the client has connected
            Console.WriteLine("Client connected.");


            //deal the first card to the player
            int playerCard1 = random.Next(1, 11);

            //deal the second card to the player
            int playerCard2 = random.Next(1, 11);

            //add the total of the cards to create a total
            int playerTotal = playerCard1 + playerCard2;

            //have the server write the cards that the player has and their total
            Console.WriteLine("Player's cards: {0}, {1}. Total: {2}", playerCard1, playerCard2, playerTotal);

            //send the player's total to the client
            byte[] playerTotalData = Encoding.ASCII.GetBytes(playerTotal.ToString());
            client.Send(playerTotalData);

            //give the dealer their first card
            int dealerCard = random.Next(1, 11);
            int dealerTotal = dealerCard;
            Console.WriteLine("Dealer's card: {0}", dealerCard);

            //wait for the player to hit or stand
            while (playerTotal <= 21)
            {
                //wait for the client to send whether they have decided to hit or stand
                byte[] hitStandData = new byte[1024];
                int bytesReceived = client.Receive(hitStandData);

                //close the server if there is no message
                if (bytesReceived == 0)
                {
                    break;
                }

                string hitStand = Encoding.ASCII.GetString(hitStandData, 0, bytesReceived);

                //if the client has decided to hit deal them another card
                if (hitStand == "HIT")
                {
                    //deal another card to the player
                    int playerCard = random.Next(1, 11);

                    //add it to their total
                    playerTotal += playerCard;

                    //have the server write the player's new total
                    Console.WriteLine("Player hit. Card: {0}. Total: {1}", playerCard, playerTotal);

                    //send the player's total to the client
                    playerTotalData = Encoding.ASCII.GetBytes(playerTotal.ToString());
                    client.Send(playerTotalData);
                }

                //if the client has decided to stand then do not give them anymore cards 
                else if (hitStand == "STAND")
                {
                    while (dealerTotal < 17)
                    {
                        //give the dealer a new card
                        int dealerNewCard = random.Next(1, 11);

                        //add it to their total
                        dealerTotal += dealerNewCard;

                        //have the server write what the dealer has been given and their total
                        Console.WriteLine("Dealer hit. Card: {0}. Total: {1}", dealerNewCard, dealerTotal);

                    }

                    //send the dealers total to the client
                    byte[] dealersTotal = Encoding.ASCII.GetBytes(dealerTotal.ToString());
                    client.Send(dealersTotal);

                    //code to determine the winner
                    Console.WriteLine("Dealer stands. Player total: {0}. Dealer total: {1}", playerTotal, dealerTotal);

                    //declare a new string
                    string winner;

                    //if the dealer's total amounts to more than 21, the winner is the player 
                    if (dealerTotal > 21 || playerTotal > dealerTotal)
                    {
                        winner = "PLAYER";
                    }

                    //if the player and the dealer have the same total, then the game is declared a tie
                    else if (playerTotal == dealerTotal)
                    {
                        winner = "TIE";
                    }

                    //if the player has more than 21 then they have bust
                    else if (playerTotal > 21)
                    {
                        winner = "DEALER, YOU BUST!";
                    }

                    else
                    {
                        winner = "DEALER";
                    }

                    //send the winner to the client
                    byte[] winnerData = Encoding.ASCII.GetBytes(winner);
                    client.Send(winnerData);

                    break;

                }
                //check if the client is connected
                if (!client.Connected)
                {
                    Console.WriteLine("Client has disconnected.");
                    break;
                }
            }

            //close the connection and the server if the client disconnects
            Console.WriteLine("\nThe client has disconnected");
            Console.WriteLine("The server will now stop");

            Thread.Sleep(6000);

            client.Close();
            server.Close();
            Environment.Exit(0);


        }

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

        Console.ReadLine();
    }
}