89 lines
2 KiB
PHP
89 lines
2 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App;
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use Assert\Assert;
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use Tightenco\Collect\Support\Collection;
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final class BowlingGame
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{
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private const MAX_PINS_PER_FRAME = 10;
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private const NUMBER_OF_FRAMES = 10;
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private Collection $rolls;
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public function __construct()
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{
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$this->rolls = new Collection();
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}
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public function roll(int $pins): void
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{
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Assert::that($pins)
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->greaterOrEqualThan(0,
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'You cannot knock down a negative number of pins. Knocked down %d.')
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->lessOrEqualThan(self::MAX_PINS_PER_FRAME,
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'You can only knock down a maximum of 10 pins in a roll. Knocked down 12.');
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$this->rolls->push($pins);
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}
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public function getScore(): int
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{
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$score = 0;
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$roll = 0;
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foreach (range(1, self::NUMBER_OF_FRAMES) as $frame) {
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if ($this->isStrike($roll)) {
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$score += $this->rolls[$roll];
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$score += $this->bonusForStrike($roll);
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$roll += 1;
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continue;
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}
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if ($this->isSpare($roll)) {
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$score += $this->defaultFrameScore($roll);
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$score += $this->bonusForSpare($roll);
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$roll += 2;
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continue;
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}
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$score += $this->defaultFrameScore($roll);
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$roll += 2;
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}
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return $score;
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}
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private function bonusForSpare(int $roll): int
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{
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return $this->rolls->get($roll + 2);
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}
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private function bonusForStrike(int $roll): int
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{
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return $this->rolls[$roll + 1] + $this->rolls[$roll + 2];
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}
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private function defaultFrameScore(int $roll): int
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{
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return $this->rolls[$roll] + $this->rolls[$roll + 1];
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}
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private function isSpare(int $roll): bool
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{
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return $this->defaultFrameScore($roll)
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== self::MAX_PINS_PER_FRAME;
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}
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private function isStrike(int $roll): bool
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{
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return $this->rolls[$roll] == self::MAX_PINS_PER_FRAME;
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}
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}
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