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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\SlidingCrates; |
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use Stratadox\PuzzleSolver\Moves; |
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use function array_fill; |
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use function implode; |
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use function str_repeat; |
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use const PHP_EOL; |
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final class Room |
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{ |
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/** @var Crates */ |
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private $crates; |
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/** @var int */ |
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private $width; |
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/** @var int */ |
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private $height; |
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/** @var Push */ |
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private $winningPush; |
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private function __construct( |
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Crates $crates, |
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int $width, |
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int $height, |
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Push $winningPush |
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) { |
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$this->crates = $crates; |
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$this->width = $width; |
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$this->height = $height; |
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$this->winningPush = $winningPush; |
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} |
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public static function withCrates( |
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Crates $crates, |
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int $width, |
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int $height, |
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Push $winningPush |
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): self { |
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return new self($crates, $width, $height, $winningPush); |
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} |
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public function afterPushing(Push ...$pushes): self |
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{ |
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$new = clone $this; |
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foreach ($pushes as $push) { |
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$new->crates = $new->crates->after($push); |
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} |
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return $new; |
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} |
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public function isSolvedFor(string $target): bool |
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{ |
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return $this->crates->withId($target)->wouldMoveOutOfBounds( |
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$this->winningPush, |
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$this->width, |
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$this->height |
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); |
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} |
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public function minimumDistanceToGoalFor(string $target): int |
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{ |
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return $this->crates->withId($target)->movesUntilOutOfBounds( |
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$this->winningPush, |
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$this->width, |
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$this->height |
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); |
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} |
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public function possiblePushes(): Moves |
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{ |
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return Push::allFor($this->crates) |
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->filterWith(function (Push $push): bool { |
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return $this->crates->withId($push->crateId())->canPush( |
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$push, |
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$this->crates, |
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$this->width, |
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$this->height |
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); |
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}); |
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} |
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public function __toString(): string |
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{ |
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$lines = array_fill(0, $this->height, str_repeat('. ', $this->width)); |
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foreach ($this->crates as $crate) { |
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foreach ($crate->coordinates() as [$x, $y]) { |
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$lines[$y][$x * 2] = $crate->id(); |
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} |
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} |
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return implode(PHP_EOL, $lines); |
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} |
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} |
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Stratadox /
PuzzleSolver
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