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<?php |
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namespace App\Game; |
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use App\Game\ReceiveTrait; |
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use App\Game\PassInfoTrait; |
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use App\Game\BankerInterface; |
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use App\Card\Card; |
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class MediumBanker implements BankerInterface |
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{ |
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use ReceiveTrait; |
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use PassInfoTrait; |
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/** |
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* From a simple representation of a full deck, |
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* remove cards matching the ones that the banker has draw this turn, |
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* as well as any cards drawn in previous turns (suit does not matter). |
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* |
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* @return int[] $deck Deck of values that the banker assumes are left. |
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*/ |
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private function getCardsLeft(): array |
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{ |
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/** @var int[] $deck Simple representation of a full deck using plain numbers */ |
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$deck = []; |
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foreach (range(1, 13) as $value) { |
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$temp = array_fill(0, 4, $value); |
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$deck = array_merge($deck, $temp); |
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} |
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/** @var Card[] $cardsToRemove All cards drawn by the banker this turn or removed in previous turns. */ |
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$cardsToRemove = array_merge($this->cards, $this->removedCards); |
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// Remove from deck |
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foreach ($cardsToRemove as $card) { |
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$key = array_search($card->getRank(), $deck); |
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if ($key !== false) { |
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unset($deck[$key]); |
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} |
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} |
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return $deck; |
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} |
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/** |
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* Returns whether or not the banker should keep hitting another card. |
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* This banker does not assume anything about the cards drawn by the player this turn. |
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* |
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* @return bool As true if the risk of bursting is less than O.5, otherwise false. |
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*/ |
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public function keepHitting(): bool |
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{ |
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/** @var int $margin Number of points the banker can score before bursting. */ |
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$margin = 21 - $this->points; |
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if ($margin > 13) { |
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return true; // No card will put the banker over 21, return early |
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} |
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/** @var int[] $cardsLeft Values of all cards that the bankers assumes are left. */ |
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$cardsLeft = $this->getCardsLeft(); |
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/** @var int[] $burstCards Values of all cards that will make the banker burst. */ |
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$burstCards = array_filter($cardsLeft, function ($value) use ($margin) { |
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return $value > $margin; |
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}); |
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/** @var float $burstRisk Risk of drawing over 21. */ |
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$burstRisk = fdiv(count($burstCards), count($cardsLeft)); |
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return $burstRisk <= 0.5; |
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} |
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} |
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kiwijos /
mvc-report
