111 lines
3.1 KiB
Python
111 lines
3.1 KiB
Python
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from poker.constants import Rank, Value
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from poker.models import Card, Hand
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def _is_flush(cards: list[Card]) -> bool:
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"""Calculate whether hand is a flush."""
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return len(set(card.suit for card in cards)) == 1
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def _is_straight(cards: list[Card]) -> bool:
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"""Calculate whether hand is a straight."""
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card_values = sorted([card.value for card in cards])
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# If card values are not unique it is not a straight
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if len(set(card_values)) != len(card_values):
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return False
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# Check for a ace low straight
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if card_values == [Value.TWO, Value.THREE, Value.FOUR, Value.FIVE, Value.ACE]:
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return True
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# If all card differences are 1 it is a straight
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diffs = [second - first for first, second in zip(card_values[:-1], card_values[1:])]
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if set(diffs) == {1}:
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return True
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return False
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def is_royal_flush(hand: Hand) -> bool:
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"""Calculate whether hand a royal flush."""
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if not _is_flush(hand.cards):
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return False
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values = [card.value for card in hand.cards]
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return all(
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value in values
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for value in [Value.ACE, Value.KING, Value.QUEEN, Value.JACK, Value.TEN]
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)
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def is_straight_flush(hand: Hand) -> bool:
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"""Calculate whether hand a straight flush."""
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return _is_straight(hand.cards) and _is_flush(hand.cards)
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def is_four_of_a_kind(hand: Hand) -> bool:
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"""Calculate whether hand has four of a kind."""
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return hand.value_counts[0][1] == 4
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def is_full_house(hand: Hand) -> bool:
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"""Calculate whether hand is a full house."""
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return hand.value_counts[0][1] == 3 and hand.value_counts[1][1] == 2
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def is_flush(hand: Hand) -> bool:
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"""Calculate whether hand is a flush."""
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return _is_flush(hand.cards) and not _is_straight(hand.cards)
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def is_straight(hand: Hand) -> bool:
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"""Calculate whether hand is a flush."""
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return _is_straight(hand.cards) and not _is_flush(hand.cards)
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def is_three_of_a_kind(hand: Hand) -> bool:
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"""Calculate whether hand is a full house."""
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return (
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hand.value_counts[0][1] == 3
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and hand.value_counts[1][1] == 1
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and hand.value_counts[2][1] == 1
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)
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def is_two_pair(hand: Hand) -> bool:
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"""Calculate whether hand is a two pair."""
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return hand.value_counts[0][1] == 2 and hand.value_counts[1][1] == 2
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def is_pair(hand: Hand) -> bool:
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"""Calculate whether hand is a pair."""
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return hand.value_counts[0][1] == 2 and hand.value_counts[1][1] == 1
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def get_rank(hand: Hand) -> Rank:
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"""Get hand rank.
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TODO: Use a factory pattern to avoid this huge flow control.
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"""
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if is_royal_flush(hand):
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return Rank.ROYAL_FLUSH
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elif is_straight_flush(hand):
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return Rank.STRAIGHT_FLUSH
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elif is_four_of_a_kind(hand):
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return Rank.FOUR_OF_A_KIND
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elif is_full_house(hand):
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return Rank.FULL_HOUSE
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elif is_flush(hand):
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return Rank.FLUSH
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elif is_straight(hand):
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return Rank.STRAIGHT
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elif is_three_of_a_kind(hand):
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return Rank.THREE_OF_A_KIND
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elif is_two_pair(hand):
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return Rank.TWO_PAIR
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elif is_pair(hand):
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return Rank.PAIR
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else:
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return Rank.HIGH_CARD
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