forked from MarseyWorld/MarseyWorld
474 lines
13 KiB
Python
474 lines
13 KiB
Python
import json
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import random
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from enum import Enum
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from math import floor
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from flask import g
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from files.classes.casino_game import CasinoGame
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from files.helpers.casino import distribute_wager_badges
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from sqlalchemy.orm.exc import MultipleResultsFound
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class BlackjackStatus(str, Enum):
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PLAYING = "PLAYING"
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STAYED = "STAYED"
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PUSHED = "PUSHED"
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WON = "WON"
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LOST = "LOST"
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BLACKJACK = "BLACKJACK"
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class BlackjackAction(str, Enum):
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DEAL = "DEAL"
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HIT = "HIT"
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STAY = "STAY"
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DOUBLE_DOWN = "DOUBLE_DOWN"
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BUY_INSURANCE = "BUY_INSURANCE"
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SPLIT = 'SPLIT'
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HIT_SPLIT = 'HIT_SPLIT'
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STAY_SPLIT = 'STAY_SPLIT'
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ranks = ("2", "3", "4", "5", "6", "7", "8", "9", "X", "J", "Q", "K", "A")
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suits = ("S", "H", "C", "D")
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deck = [rank + suit for rank in ranks for suit in suits]
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deck_count = 4
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minimum_bet = 5
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def get_initial_state():
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return {
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"player": [],
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"player_split": [],
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"player_split_value": 0,
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"player_value": 0,
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"dealer": [],
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"dealer_value": 0,
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"has_player_split": False,
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"player_bought_insurance": False,
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"player_doubled_down": False,
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"status": BlackjackStatus.PLAYING,
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"status_split": BlackjackStatus.PLAYING,
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"actions": [],
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"wager": {
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"amount": 0,
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"currency": "coins"
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},
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"payout": 0,
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}
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def build_casino_game(gambler, wager, currency):
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initial_state = get_initial_state()
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initial_state['wager']['amount'] = wager
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initial_state['wager']['currency'] = currency
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casino_game = CasinoGame()
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casino_game.user_id = gambler.id
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casino_game.currency = currency
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casino_game.wager = wager
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casino_game.winnings = 0
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casino_game.kind = 'blackjack'
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casino_game.game_state = json.dumps(initial_state)
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casino_game.active = True
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g.db.add(casino_game)
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return casino_game
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def get_active_twentyone_game(gambler):
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try:
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return g.db.query(CasinoGame).filter(
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CasinoGame.active == True,
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CasinoGame.kind == 'blackjack',
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CasinoGame.user_id == gambler.id).one_or_none()
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except MultipleResultsFound:
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games = g.db.query(CasinoGame).filter(
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CasinoGame.active == True,
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CasinoGame.kind == 'blackjack',
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CasinoGame.user_id == gambler.id).all()
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for game in games:
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g.db.delete(game)
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g.db.commit()
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return None
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def get_active_twentyone_game_state(gambler):
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active_game = get_active_twentyone_game(gambler)
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full_state = active_game.game_state_json
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return remove_exploitable_information(full_state)
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def charge_gambler(gambler, amount, currency):
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charged = gambler.charge_account(currency, amount)[0]
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if not charged:
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raise Exception("Gambler cannot afford charge.")
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def create_new_game(gambler, wager, currency):
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existing_game = get_active_twentyone_game(gambler)
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over_minimum_bet = wager >= minimum_bet
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if existing_game:
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existing_game.active = False
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g.db.add(existing_game)
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if not over_minimum_bet:
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raise Exception(f"Gambler must bet over {minimum_bet} {currency}.")
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try:
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charge_gambler(gambler, wager, currency)
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new_game = build_casino_game(gambler, wager, currency)
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g.db.add(new_game)
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g.db.flush()
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except:
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raise Exception(f"Gambler cannot afford to bet {wager} {currency}.")
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def handle_blackjack_deal(state, split):
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deck = build_deck(state)
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first = deck.pop()
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second = deck.pop()
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third = deck.pop()
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fourth = deck.pop()
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state['player'] = [first, third]
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state['dealer'] = [second, fourth]
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return state
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def handle_blackjack_hit(state, split = False):
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deck = build_deck(state)
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if(split and state['has_player_split'] and state['status_split'] != BlackjackStatus.LOST):
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next_card = deck.pop()
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state['player_split'].append(next_card)
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elif(state['status'] != BlackjackStatus.LOST):
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next_card = deck.pop()
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state['player'].append(next_card)
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return state
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def handle_blackjack_stay(state, split = False):
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if(split and state['has_player_split'] and state['status_split'] != BlackjackStatus.LOST):
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state['status_split'] = BlackjackStatus.STAYED
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elif(state['status'] != BlackjackStatus.LOST):
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state['status'] = BlackjackStatus.STAYED
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return state
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def handle_blackjack_double_down(state, split):
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state['player_doubled_down'] = True
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state = handle_blackjack_hit(state)
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state = handle_blackjack_stay(state)
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return state
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def handle_blackjack_buy_insurance(state, split):
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state['player_bought_insurance'] = True
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return state
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def handle_split(state, split):
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state['has_player_split'] = True
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state['player_split'] = [state['player'].pop()]
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state = handle_blackjack_hit(state)
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state = handle_blackjack_hit(state, True)
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return state
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def check_for_completion(state):
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has_split = state['has_player_split']
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after_initial_deal = len(
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state['player']) == 2 and len(state['dealer']) == 2 and not has_split
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player_hand_value = get_value_of_hand(state['player'])
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player_split_hand_value = get_value_of_hand(state['player_split'])
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dealer_hand_value = get_value_of_hand(state['dealer'])
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# Both player and dealer were initially dealt 21: Push.
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if after_initial_deal and player_hand_value == 21 and dealer_hand_value == 21:
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state['status'] = BlackjackStatus.PUSHED
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return True, state
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# Player was originally dealt 21, dealer was not: Blackjack.
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if after_initial_deal and player_hand_value == 21:
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state['status'] = BlackjackStatus.BLACKJACK
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return True, state
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# Player went bust: Lost.
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if player_hand_value == -1 and state['status'] != BlackjackStatus.LOST:
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state['status'] = BlackjackStatus.LOST
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if(not has_split or state['status_split'] == BlackjackStatus.LOST):
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return True, state
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# Player went bust: Lost.
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if player_split_hand_value == -1 and state['status_split'] != BlackjackStatus.LOST:
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state['status_split'] = BlackjackStatus.LOST
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if state['status'] == BlackjackStatus.LOST:
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return True, state
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hand_terminal_status = state['status'] in [BlackjackStatus.LOST, BlackjackStatus.STAYED]
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hand_split_terminal_status = not has_split or state['status_split'] in [BlackjackStatus.LOST, BlackjackStatus.STAYED]
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# Player chose to stay: Deal rest for dealer then determine winner.
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if hand_split_terminal_status and hand_terminal_status:
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deck = build_deck(state)
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while dealer_hand_value < 17 and dealer_hand_value != -1:
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next_card = deck.pop()
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state['dealer'].append(next_card)
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dealer_hand_value = get_value_of_hand(state['dealer'])
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if((not has_split) or state['status'] != BlackjackStatus.LOST):
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if player_hand_value > dealer_hand_value or dealer_hand_value == -1:
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state['status'] = BlackjackStatus.WON
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elif dealer_hand_value > player_hand_value:
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state['status'] = BlackjackStatus.LOST
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else:
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state['status'] = BlackjackStatus.PUSHED
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state['player_value'] = get_value_of_hand(state['player'])
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state['dealer_value'] = get_value_of_hand(state['dealer'])
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if has_split and state['status_split'] != BlackjackStatus.LOST:
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if player_split_hand_value > dealer_hand_value or dealer_hand_value == -1:
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state['status_split'] = BlackjackStatus.WON
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elif dealer_hand_value > player_split_hand_value:
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state['status_split'] = BlackjackStatus.LOST
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else:
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state['status_split'] = BlackjackStatus.PUSHED
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state['player_split_value'] = get_value_of_hand(state['player_split'])
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return True, state
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return False, state
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def does_insurance_apply(state):
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dealer = state['dealer']
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dealer_hand_value = get_value_of_hand(dealer)
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dealer_first_card_ace = dealer[0][0] == 'A'
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dealer_never_hit = len(dealer) == 2
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return not state['has_player_split'] and dealer_hand_value == 21 and dealer_first_card_ace and dealer_never_hit
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def can_purchase_insurance(state):
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dealer = state['dealer']
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dealer_first_card_ace = dealer[0][0] == 'A'
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dealer_never_hit = len(dealer) == 2
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return not state['has_player_split'] and dealer_first_card_ace and dealer_never_hit and not state['player_bought_insurance']
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def can_double_down(state):
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player = state['player']
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player_hand_value = get_value_of_hand(player)
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player_never_hit = len(player) == 2
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return not state['has_player_split'] and player_hand_value in (9, 10, 11) and player_never_hit
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def can_split(state):
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player = state['player']
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player_never_hit = len(player) == 2
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hand_can_split = get_value_of_card(player[0]) == get_value_of_card(player[1])
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player_has_split = state['has_player_split']
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return hand_can_split and player_never_hit and not player_has_split
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def handle_payout(gambler, state, game):
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status = state['status']
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split_status = state['status_split']
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payout = 0
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if status == BlackjackStatus.BLACKJACK:
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game.winnings = floor(game.wager * 3/2)
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payout = game.wager + game.winnings
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elif status == BlackjackStatus.WON:
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game.winnings = game.wager
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payout = game.wager * 2
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elif status == BlackjackStatus.LOST:
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dealer = state['dealer']
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dealer_first_card_ace = dealer[0][0] == 'A'
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dealer_never_hit = len(dealer) == 2
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dealer_hand_value = get_value_of_hand(dealer) == 21
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insurance_applies = dealer_hand_value == 21 and dealer_first_card_ace and dealer_never_hit
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if insurance_applies and state['player_bought_insurance']:
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game.winnings = 0
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payout = game.wager
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else:
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game.winnings = -game.wager
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payout = 0
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elif status == BlackjackStatus.PUSHED:
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game.winnings = 0
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payout = game.wager
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else:
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raise Exception("Attempted to payout a game that has not finished.")
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if split_status == BlackjackStatus.WON:
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game.winnings += game.wager
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payout += game.wager * 2
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elif split_status == BlackjackStatus.LOST:
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game.winnings += -game.wager
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elif split_status == BlackjackStatus.PUSHED:
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payout += game.wager
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gambler.pay_account(game.currency, payout)
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if status in {BlackjackStatus.BLACKJACK, BlackjackStatus.WON} or split_status in {BlackjackStatus.WON}:
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distribute_wager_badges(gambler, game.wager, won=True)
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elif status == BlackjackStatus.LOST or split_status == BlackjackStatus.LOST:
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distribute_wager_badges(gambler, game.wager, won=False)
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game.active = False
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g.db.add(game)
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return payout
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def remove_exploitable_information(state):
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safe_state = state
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if len(safe_state['dealer']) >= 2:
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safe_state['dealer'][1] = '?'
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safe_state['dealer_value'] = '?'
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return safe_state
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action_handlers = {
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BlackjackAction.DEAL: handle_blackjack_deal,
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BlackjackAction.HIT: handle_blackjack_hit,
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BlackjackAction.STAY: handle_blackjack_stay,
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BlackjackAction.DOUBLE_DOWN: handle_blackjack_double_down,
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BlackjackAction.BUY_INSURANCE: handle_blackjack_buy_insurance,
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BlackjackAction.SPLIT: handle_split,
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}
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def dispatch_action(gambler, action, is_split = False):
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game = get_active_twentyone_game(gambler)
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handler = action_handlers[action]
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if not game:
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raise Exception(
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'Gambler has no active blackjack game.')
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if not handler:
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raise Exception(
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f'Illegal action {action} passed to Blackjack#dispatch_action.')
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state = game.game_state_json
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if action == BlackjackAction.BUY_INSURANCE:
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if not can_purchase_insurance(state):
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raise Exception("Insurance cannot be purchased.")
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charge_gambler(gambler, floor(game.wager / 2), game.currency)
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if action == BlackjackAction.DOUBLE_DOWN:
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if not can_double_down(state):
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raise Exception("Cannot double down.")
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charge_gambler(gambler, game.wager, game.currency)
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game.wager *= 2
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if action == BlackjackAction.SPLIT:
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if not can_split(state):
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raise Exception("Cannot split")
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charge_gambler(gambler, game.wager, game.currency)
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new_state = handler(state, is_split)
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new_state['player_value'] = get_value_of_hand(new_state['player'])
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new_state['dealer_value'] = get_value_of_hand(new_state['dealer'])
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new_state['player_split_value'] = get_value_of_hand(new_state['player_split'])
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game_over, final_state = check_for_completion(new_state)
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new_state['actions'] = get_available_actions(new_state)
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game.game_state = json.dumps(new_state)
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g.db.add(game)
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if game_over:
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payout = handle_payout(gambler, final_state, game)
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final_state['actions'] = [BlackjackAction.DEAL]
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final_state['payout'] = payout
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return final_state
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else:
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safe_state = remove_exploitable_information(new_state)
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return safe_state
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def shuffle(collection):
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random.shuffle(collection)
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return collection
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def build_deck(state):
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card_counts = {}
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for card in deck:
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card_counts[card] = deck_count
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cards_already_dealt = state['player'].copy()
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cards_already_dealt.extend(state['player_split'].copy())
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cards_already_dealt.extend(state['dealer'].copy())
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for card in cards_already_dealt:
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card_counts[card] = card_counts[card] - 1
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deck_without_already_dealt_cards = []
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for card in deck:
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amount = card_counts[card]
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for _ in range(amount):
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deck_without_already_dealt_cards.append(card)
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return shuffle(deck_without_already_dealt_cards)
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def get_value_of_card(card):
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rank = card[0]
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return 0 if rank == "A" else min(ranks.index(rank) + 2, 10)
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def get_value_of_hand(hand):
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without_aces = sum(map(get_value_of_card, hand))
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ace_count = sum("A" in c for c in hand)
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possibilities = []
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for i in range(ace_count + 1):
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value = without_aces + (ace_count - i) + i * 11
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possibilities.append(-1 if value > 21 else value)
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return max(possibilities)
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def get_available_actions(state):
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actions = []
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if state['status'] == BlackjackStatus.PLAYING:
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actions.append(BlackjackAction.HIT)
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actions.append(BlackjackAction.STAY)
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if state['has_player_split'] and state['status_split'] == BlackjackStatus.PLAYING:
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actions.append(BlackjackAction.HIT_SPLIT)
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actions.append(BlackjackAction.STAY_SPLIT)
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if can_double_down(state):
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actions.append(BlackjackAction.DOUBLE_DOWN)
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if can_purchase_insurance(state):
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actions.append(BlackjackAction.BUY_INSURANCE)
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if can_split(state):
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actions.append(BlackjackAction.SPLIT)
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return actions
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