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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\SlidingCrates; |
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final class Crate |
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{ |
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/** @var string */ |
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private $id; |
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/** @var Rectangle */ |
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private $rectangle; |
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/** @var bool */ |
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private $canSlideHorizontally; |
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/** @var bool */ |
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private $canSlideVertically; |
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public function __construct( |
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string $id, |
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Rectangle $rectangle, |
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bool $canSlideHorizontally, |
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bool $canSlideVertically |
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) { |
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$this->id = $id; |
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$this->rectangle = $rectangle; |
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$this->canSlideHorizontally = $canSlideHorizontally; |
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$this->canSlideVertically = $canSlideVertically; |
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} |
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public static function fromCoordinates( |
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string $id, |
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array ...$coordinates |
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): self { |
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return self::fromIdAndRectangle( |
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$id, |
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Rectangle::fromCoordinates(...$coordinates) |
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); |
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} |
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public static function fromIdAndRectangle( |
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string $id, |
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Rectangle $rectangle |
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): self { |
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return new self( |
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$id, |
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$rectangle, |
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$rectangle->isHorizontal(), |
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$rectangle->isVertical() |
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); |
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} |
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public function after(Push $push): self |
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{ |
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$new = clone $this; |
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$new->rectangle = $new->rectangle->after($push); |
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return $new; |
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} |
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public function id(): string |
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{ |
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return $this->id; |
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} |
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public function wouldMoveOutOfBounds( |
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Push $push, |
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int $width, |
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int $height |
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): bool { |
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return $this->rectangle->after($push)->isOutOfBounds($width, $height); |
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} |
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public function movesUntilOutOfBounds( |
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Push $push, |
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int $width, |
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int $height |
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): int { |
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$i = 0; |
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$rectangle = $this->rectangle; |
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while (!$rectangle->isOutOfBounds($width, $height)) { |
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++$i; |
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$rectangle = $rectangle->after($push); |
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} |
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return $i; |
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} |
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public function canPush( |
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Push $push, |
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Crates $obstacles, |
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int $width, |
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int $height |
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): bool { |
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if (!$this->canMoveInDirectionOf($push)) { |
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return false; |
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} |
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$rectangle = $this->rectangle->after($push); |
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return !$rectangle->isOutOfBounds($width, $height) |
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&& $this->canMoveUnhindered($rectangle, $obstacles->remove($this)); |
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} |
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public function coordinates(): array |
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{ |
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return $this->rectangle->coordinates(); |
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} |
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public function __toString(): string |
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{ |
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return "{$this->id} @ {$this->rectangle}"; |
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} |
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private function canMoveInDirectionOf(Push $push): bool |
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{ |
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return (!$push->isHorizontal() || $this->canSlideHorizontally) |
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&& (!$push->isVertical() || $this->canSlideVertically); |
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} |
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private function canMoveUnhindered( |
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Rectangle $movedRectangle, |
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Crates $obstacles |
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): bool { |
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foreach ($obstacles as $obstacle) { |
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if ($obstacle->rectangle->collidesWith($movedRectangle)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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Stratadox /
PuzzleSolver
