import random

# define card values
CARD_VALUES = {
    '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, '10': 10, 
    'J': 10, 'Q': 10, 'K': 10, 'A': 11
}

# function to create a deck of cards
def create_deck():
    deck = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A'] * 4
    random.shuffle(deck)
    return deck

# function to calculate the total score of a hand
def calculate_total(hand):
    total = 0
    aces = hand.count('A')
    
    # add up the face cards and number cards
    for card in hand:
        total += CARD_VALUES[card]
    
    # adjust for aces if needed
    while total > 21 and aces:
        total -= 10
        aces -= 1
    
    return total

# function to simulate the dealers turn
def dealer_turn(deck, dealer_hand):
    while calculate_total(dealer_hand) < 17:
        dealer_hand.append(deck.pop())
    return dealer_hand

# function to print the hands and total score
def print_hands(player_hand, dealer_hand, reveal_dealer=False):
    print(f"Player's hand: {', '.join(player_hand)} | Total: {calculate_total(player_hand)}")
    
    if reveal_dealer:
        print(f"Dealer's hand: {', '.join(dealer_hand)} | Total: {calculate_total(dealer_hand)}")
    else:
        print(f"Dealer's hand: {dealer_hand[0]}, ?")

# function to check for the winner
def check_winner(player_hand, dealer_hand):
    player_total = calculate_total(player_hand)
    dealer_total = calculate_total(dealer_hand)
    
    if player_total > 21:
        return "Player busts! Dealer wins."
    elif dealer_total > 21:
        return "Dealer busts! Player wins."
    elif player_total == dealer_total:
        return "It's a draw!"
    elif player_total > dealer_total:
        return "Player wins!"
    else:
        return "Dealer wins!"

# main game function
def play_game():
    # initial setup
    deck = create_deck()
    player_hand = [deck.pop(), deck.pop()]
    dealer_hand = [deck.pop(), deck.pop()]

    # players turn
    while True:
        print_hands(player_hand, dealer_hand)
        choice = input("Do you want to 'hit' or 'stand'? ").lower()
        
        if choice == 'hit':
            player_hand.append(deck.pop())
            if calculate_total(player_hand) > 21:
                print_hands(player_hand, dealer_hand, reveal_dealer=True)
                print("Player busts! Dealer wins.")
                return
        elif choice == 'stand':
            break
        else:
            print("Invalid choice. Please enter 'hit' or 'stand'.")
    
    # dealers turn
    dealer_hand = dealer_turn(deck, dealer_hand)
    print_hands(player_hand, dealer_hand, reveal_dealer=True)

    # determine winner
    print(check_winner(player_hand, dealer_hand))

# play the game
if __name__ == "__main__":
    print("Welcome to the Game of 21!")
    play_game()