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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\SlidingCrates; |
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use JsonSerializable; |
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use Stratadox\PuzzleSolver\Move; |
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use Stratadox\PuzzleSolver\Moves; |
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use function in_array; |
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final class Push implements Move, JsonSerializable |
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{ |
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private const LEFT = 'left'; |
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private const RIGHT = 'right'; |
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private const UP = 'up'; |
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private const DOWN = 'down'; |
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private const HORIZONTAL = [self::LEFT, self::RIGHT]; |
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private const VERTICAL = [self::UP, self::DOWN]; |
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/** @var string */ |
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private $direction; |
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/** @var string */ |
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private $crateId; |
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public function __construct(string $direction, string $crateId) |
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{ |
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$this->direction = $direction; |
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$this->crateId = $crateId; |
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} |
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public static function allFor(Crates $crates): Moves |
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{ |
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$moves = []; |
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foreach ($crates as $crate) { |
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$moves[] = Push::left($crate->id()); |
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$moves[] = Push::right($crate->id()); |
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$moves[] = Push::up($crate->id()); |
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$moves[] = Push::down($crate->id()); |
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} |
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return new Moves(...$moves); |
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} |
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public static function left(string $rectangle): self |
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{ |
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return new self(self::LEFT, $rectangle); |
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} |
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public static function right(string $rectangle): self |
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{ |
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return new self(self::RIGHT, $rectangle); |
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} |
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public static function up(string $rectangle): self |
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{ |
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return new self(self::UP, $rectangle); |
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} |
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public static function down(string $rectangle): self |
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{ |
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return new self(self::DOWN, $rectangle); |
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} |
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public function crateId(): string |
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{ |
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return $this->crateId; |
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} |
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public function isHorizontal(): bool |
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{ |
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return in_array($this->direction, self::HORIZONTAL); |
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} |
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public function isVertical(): bool |
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{ |
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return in_array($this->direction, self::VERTICAL); |
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} |
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public function newX(int $oldX): int |
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{ |
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switch ($this->direction) { |
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case self::RIGHT: return $oldX + 1; |
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case self::LEFT: return $oldX - 1; |
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default: return $oldX; |
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} |
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} |
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public function newY(int $oldY): int |
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{ |
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switch ($this->direction) { |
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case self::UP: return $oldY - 1; |
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case self::DOWN: return $oldY + 1; |
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default: return $oldY; |
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} |
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} |
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public function __toString(): string |
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{ |
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return "Push {$this->crateId} {$this->direction}"; |
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} |
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public function jsonSerialize(): array |
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{ |
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return [ |
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'id' => $this->crateId, |
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'direction' => $this->direction, |
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]; |
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} |
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} |
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Stratadox /
PuzzleSolver
