using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BlackJack
{
    class Program
    {
        static void Main(string[] args)
        {
            bool gameInProgress = true, gameWon = false;
            Console.WriteLine("What would you like your name to be?");
            Player player = new Player(Console.ReadLine().Trim());
            Deck deck = new Deck();
            Game game = new Game(player, deck);
            game.dealer.DrawCards(player, deck, game);
            game.dealer.DrawCards(player, deck, game);
            game.dealer.DrawCards(game.dealer, deck, game);
            game.dealer.DrawCards(game.dealer, deck, game);
            game.dealer.shuffle(deck);

            do
            {
                while (!gameWon)
                {
                    bool stay = false;
                    if (!game.checkWinner(player, game.dealer, stay))
                    {
                        if (game.promptUser(player))
                            game.nextTurn(player, deck, game);
                        else
                            stay = true;
                        if (stay)
                        {
                            game.checkWinner(player, game.dealer, stay);
                            gameWon = true;
                        }
                    }
                    else
                        gameWon = true;
                }
                Console.WriteLine("The winner is {0} because {1}", game.winner, game.wonBy);
                Console.WriteLine("You have won {0} out of {1}. Would you like to play again?", player.gamesWon, player.gamesWon + player.gamesLost);
                bool response = false;
                while (!response)
                {
                    switch (Console.ReadLine().Trim().ToLower())
                    {
                        case "yes":
                            response = true;
                            gameWon = false;
                            player.score = 0;
                            game = new Game(player, deck);
                            continue;
                        case "no":
                            gameInProgress = false;
                            response = true;
                            continue;
                        default:
                            Console.WriteLine("I'm sorry, I can't interperate your response. Try again.");
                            continue;
                    }
                }
            } while (gameInProgress);
        }
    }
    public class Game
    {
        public Dealer dealer;
        public string winner, wonBy;
        public Game(Player player, Deck deck)
        {
            player.score = 0;
            dealer = new Dealer();
            player.hand.Clear();
        }
        public void nextTurn(Player player, Deck deck, Game game)
        {
            dealer.DrawCards(player, deck, game);
            dealer.DrawCards(dealer, deck, game);
        }
        public bool checkWinner(Player player, Dealer dealer, bool stay)
        {
            if (player.score > 21)
            {
                winner = "the dealer";
                wonBy = "the player busted.";
                player.gamesLost++;
                return true;
            }
            else if (dealer.score > 21)
            {
                winner = player.playerName;
                wonBy = "the dealer busted.";
                player.gamesWon++;
                return true;
            }
            else if (player.hand.Count == 2 && player.score == 21)
            {
                winner = player.playerName;
                wonBy = "you obtained a blackjack.";
                player.gamesWon++;
                return true;
            }
            else if (dealer.cardsDealt == 12)
            {
                winner = player.playerName;
                wonBy = "you drew six cards without having a score above or equal to 21";
                player.gamesWon++;
                return true;
            }
            else if (dealer.score > 15)
                stay = true;
            else if (player.score > dealer.score && stay)
            {
                winner = player.playerName;
                wonBy = "a stay was played, and you're closer to 21 than the dealer.";
                player.gamesWon++;
                return true;
            }
            else if (dealer.score > player.score && stay)
            {
                winner = "the dealer";
                wonBy = "a stay was played, and your score is further away to 21 than the dealers.";
                player.gamesLost++;
                return true;
            }
            else if (dealer.score == player.score)
            {
                winner = "nobody";
                wonBy = "a tie was achieved.";
                return true;
            }
            return false;
        }
        public bool promptUser(Player player)
        {
            bool response = false;
            Console.WriteLine("The dealers showing card is: {0}", dealer.hand[0].key);
            Console.WriteLine("Your score is {0}. Would you like to hit or stay?", player.score);
            foreach (var card in player.hand)
            {
                Console.WriteLine(card.key);
            }
            while (!response)
            {
                switch (Console.ReadLine().Trim().ToLower())
                {
                    case "hit":
                    case "i would like to hit":
                    case "i'd like to hit":
                        response = true;
                        return true;
                    case "stay":
                    case "i would like to stay":
                    case "i'd like to stay":
                        response = true;
                        return false;
                    default:
                        Console.WriteLine("I'm sorry, I can't interperate your input. Try again.");
                        continue;
                }
            }
            return false;
        }

        public class Dealer : Participants
        {
            Random random = new Random();
            public int cardsDealt = 0;

            public void shuffle(Deck deck)
            {
                Console.WriteLine("Shuffling...");
                cardsDealt = 0;
                for (int j = 0; j < 5; j++)
                {
                    int[] indexes = Enumerable.Repeat(0, deck.cards.Count).Select(i => random.Next(0, deck.cards.Count)).ToArray();
                    for (int i = 0; i < deck.cards.Count; i++)
                    {
                        Card placeHolder;
                        placeHolder = deck.cards[indexes[i]];
                        deck.cards[indexes[i]] = deck.cards[i];
                        deck.cards[i] = placeHolder;
                    }
                }
            }


            public void DrawCards<T>(T participant, Deck deck, Game game) where T : Participants
            {
                cardsDealt++;
                if (cardsDealt != deck.cards.Count)
                {
                    participant.hand.Add(deck.cards[cardsDealt]);
                    participant.score += deck.cards[cardsDealt].value;
                }
                else
                    {
                    deck = deck.newDeck(game);
                    participant.hand.Add(deck.cards[cardsDealt]);
                    participant.score += deck.cards[cardsDealt].value;
                    cardsDealt = 1;
                }
            }
        }

        public abstract class Participants
        {
            public List<Card> hand = new List<Card>();
            public int score = 0;
        }
    }
    public class Player : Game.Participants
    {
        public string playerName;
        public int gamesWon = 0, gamesLost = 0;
        public Player(string playerName)
        {
            this.playerName = playerName;
        }
    }
}