using System;

using System.Collections;

using System.Linq;

using System.Text;

using System.Diagnostics;





namespace SharedGamesClasses {

    public static class TwentyOne {



        const int PLAYER = 0;

        const int DEALER = 1;



        const int ACE_ELEVEN = 11;

        const int ACE_ONE = 1;

        const int TEN = 10;

        const int TWO = 2;

        const int TWENTY_ONE = 21;



        const string PLAYERS_NAME = "Player";

        const string DEALERS_NAME = "Dealer";



        private static Pack pack = new Pack();

        private static ArrayList[] hands = new ArrayList[2];

    

        private static bool playerTurn;

        private static bool dealerTurn;



        private static int playerHandTotal = 0;

        private static int dealerHandTotal = 0;

        private static int playerScore = 0;

        private static int dealerScore = 0;



        private static string gameWinner;

        private static string outPutMessage;













        /// <summary>

        /// Plays the game of Twenty One until the user decides to stop.

        /// </summary>

        public static void Play() {            



            do { // until user chooses to stop



                SetUpGame();



                PlayerTurn();



                if (dealerTurn) {

                    DealerTurn();

                }

            

                OutPutWinner();



                DisplayScores();

                            

            } while (StillPlaying());



        } // end Play











        /// <summary>

        /// Set up to play the game, 

        /// by shuffling the pack of cards and 

        /// dealing the two hands 

        /// </summary>

        private static void SetUpGame() {

            for (int i = 0; i < hands.Length; i++) {

                hands[i] = new ArrayList();

            }



            DealHands();



            DisplayHand(hands[PLAYER], PLAYERS_NAME);

            DisplayHand(hands[DEALER], DEALERS_NAME);



        } // end SetUpGame











        private static void DealHands() {

            pack.Shuffle();

            hands[PLAYER] = pack.DealTwoCards();

            hands[DEALER] = pack.DealTwoCards();



        } // end DealHands











        private static void PlayerTurn() {            



            do { // until player stays



                playerHandTotal = CurrentPoints(PLAYER);



                if (playerHandTotal == TWENTY_ONE) {

                    gameWinner = PLAYERS_NAME;

                    outPutMessage = "player 21";

                    playerTurn = false;

                    dealerTurn = false;



                } else if (Bust(playerHandTotal)) {

                    gameWinner = DEALERS_NAME;

                    outPutMessage = "player bust";

                    playerTurn = false;

                    dealerTurn = false;



                } else if (PlayerWantToHit()) {

                    Hit(PLAYER);

                    DisplayHand(hands[PLAYER], PLAYERS_NAME);

                    playerTurn = true;



                } else {

                    playerTurn = false;

                    dealerTurn = true;

                    Console.WriteLine("\n\tPlayer stays with {0} points.", playerHandTotal);

                }



                



            } while (playerTurn);



        } // end PlayerTurn











        private static void DealerTurn() {



            do { // until dealer wins or loses



                dealerHandTotal = CurrentPoints(DEALER);



                if (Bust(dealerHandTotal)) {

                    outPutMessage = "dealer bust";

                    gameWinner = PLAYERS_NAME;

                    dealerTurn = false;



                } else if (dealerHandTotal > playerHandTotal) {

                    gameWinner = DEALERS_NAME;

                    dealerTurn = false;



                } else if (dealerHandTotal <= playerHandTotal) {

                    Hit(DEALER);

                    Console.WriteLine("\n\tDealer Hit");

                    DisplayHand(hands[DEALER], DEALERS_NAME);

                    dealerTurn = true;

                }



                



            } while (dealerTurn);



        } // end DealerTurn











        private static int CurrentPoints(int who) {



            ArrayList hand = hands[who];

            Card card;

            int handTotal = 0;            



            for (int i = 0; i < hand.Count; i++ ) {



                card = (Card) hand[i];



                if (card.GetFaceValue() == FaceValue.Ace) {



                    if (handTotal < ACE_ELEVEN) {

                        handTotal += ACE_ELEVEN;

                    } else {

                        handTotal += ACE_ONE;

                    }



                } else if (((int)card.GetFaceValue() + TWO) > TEN) {

                    handTotal += TEN;



                } else {

                    handTotal += (int)card.GetFaceValue() + TWO;

                }



            }



            return handTotal;



        } //end Play











        private static bool Bust(int handTotal) {

            return handTotal > TWENTY_ONE;



        } // end Bust











        private static bool PlayerWantToHit() {



            string userInput;



            do { // while input is not valid



                // prompt the player.

                Console.WriteLine("\nDo you want to hit (H) or stay (S):");



                // get and check the player's input.

                userInput = Console.ReadLine();



                if (userInput != "H" && userInput != "h" && userInput != "S" && userInput != "s") {

                    Console.WriteLine("\nPlease enter either Y or N");

                }



            } while (userInput != "H" && userInput != "h" && userInput != "S" & userInput != "s");



            if (userInput == "H" || userInput == "h") {

                return true;

            } else {

                return false;

            }



        } // end of WantToHit











        private static bool DealerWantToHit() {

            return dealerHandTotal <= playerHandTotal;



        } // end DealerWantToHit











        private static void Hit(int who) {

            hands[who].Add(pack.DealOneCard());



        } // end Hit









            

        /// <summary>

        /// Output the hand of cards of either the Player or the Dealer

        /// </summary>

        /// <param name="hand"> a player's hand which consists of two or more cards</param>

        /// <param name="who">the player whose hand it is</param>

        public static void DisplayHand(ArrayList hand, string who) {



            // the items of the hand arraylist parameter need to be assigned

            // to individual card objects in order to perform the GetFaceValue()

            // accessor method on them

            Card tempCard1 = (Card) hand[0];

            Card tempCard2 = (Card) hand[1];



            Console.Write("\n\t{0} has {1}, {2}", who, tempCard1.GetFaceValue(), tempCard2.GetFaceValue());



            if (hand.Count > 2) {



                for (int i = 2; i < hand.Count; i++) {



                    Card tempCard = (Card)hand[i];

                    Console.Write(", {0}", tempCard.GetFaceValue());

                }

            }



            Console.WriteLine();

            

        } // end DisplayHand











        private static void OutPutWinner() {



            switch (outPutMessage) {

 

                case "player 21":

                    Console.WriteLine("\n\tPlayer wins with 21!");

                    break;



                case "player bust":

                    Console.WriteLine("\n\tPlayer has gone bust with {0} points", playerHandTotal);

                    break;



                case "dealer bust" :

                    Console.WriteLine("\n\tDealer has gone bust with {0} points", dealerHandTotal);

                    break;



                default :

                    Console.WriteLine("\n\tPlayer has {0} points, Dealer has {1} points.", playerHandTotal, dealerHandTotal);

                    break;

            }

            

            Console.WriteLine("\n\t{0} wins", gameWinner);



            outPutMessage = "null";

           

        } // end OutPutWInner











        private static void DisplayScores() {



            UpdateScores();



            Console.WriteLine("\nPlayer has won {0} games and Dealer has won {1} games.", 

                playerScore, dealerScore);





        } // end DisplayScores











        private static void UpdateScores() {

            if (gameWinner == "Player") {

                playerScore++;



            } else {

                dealerScore++;

            }



        } // end UpdateScores











        private static bool StillPlaying() {



            // check if player wants to play again

            if (WantToPlayAgain_ConsoleOnly()) {

                DealHands();

                return true;



            } else {

                return false;

            }                    



        } // end PlayAgain











        /// Asks the user if they wish to play again.

        /// Pre:  none

        /// Post: whether player wishes to play again.

        /// </summary>

        /// <returns>

        /// true if player wishes to play again,

        /// false otherwise

        /// </returns>

        private static bool WantToPlayAgain_ConsoleOnly() {



            string userInput;



            do { // while input is not valid



                // prompt the player.

                Console.WriteLine("\nPlay again? (Y or N):");



                // get and check the player's input.

                userInput = Console.ReadLine();



                if (userInput != "Y" && userInput != "y" && userInput != "N" && userInput != "n") {

                    Console.WriteLine("**Please enter either Y or N");

                }



            } while (userInput != "Y" && userInput != "y" && userInput != "N" & userInput != "n");



            if (userInput == "Y" || userInput == "y") {

                return true;

            } else {

                return false;

            }



        } // end WantToPlayAgain_ConsoleOnly

        

    } // end class TwentyOne

} // end namespace