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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\Move; |
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use Stratadox\PuzzleSolver\Puzzle; |
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use Stratadox\PuzzleSolver\Moves; |
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use function count; |
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use function preg_split; |
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use function str_replace; |
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use function str_split; |
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use function usort; |
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final class SlidingCratesPuzzle implements Puzzle |
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{ |
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private const NO_CRATE = '.'; |
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/** @var Room */ |
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private $room; |
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/** @var string */ |
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private $target; |
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/** @var Moves */ |
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private $moves; |
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private function __construct(Room $room, string $target, Moves $moves) |
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{ |
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$this->room = $room; |
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$this->target = $target; |
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$this->moves = $moves; |
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} |
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public static function with(Room $room, string $target): Puzzle |
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{ |
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return new self($room, $target, Moves::none()); |
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} |
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public static function fromString(string $crates, string $target): Puzzle |
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{ |
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$rows = []; |
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foreach (preg_split("/(\n)|(\r)/", str_replace(' ', '', $crates)) as $line) { |
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$row = []; |
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if (empty($line)) { |
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continue; |
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} |
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foreach (str_split($line) as $char) { |
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$row[] = $char; |
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} |
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$rows[] = $row; |
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} |
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return self::fromArray($rows, $target); |
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} |
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public static function fromArray(array $room, string $target): Puzzle |
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{ |
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/** @var array[][] $crateCoordinates */ |
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$crateCoordinates = []; |
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foreach ($room as $y => $row) { |
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foreach ($row as $x => $column) { |
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if ($column === self::NO_CRATE) { |
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continue; |
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} |
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$crateCoordinates[$column][] = [$x, $y]; |
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} |
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} |
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/** @var Crate[] $crates */ |
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$crates = []; |
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foreach ($crateCoordinates as $id => $coordinates) { |
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$crates[] = Crate::fromCoordinates($id, ...$coordinates); |
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} |
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usort($crates, static function (Crate $crate1, Crate $crate2): int { |
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return $crate1->id() <=> $crate2->id(); |
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}); |
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return self::with(Room::withCrates( |
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new Crates(...$crates), |
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count($room[0]), |
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count($room), |
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Push::right($target) |
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), $target); |
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} |
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public function representation(): string |
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{ |
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return (string) $this->room; |
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} |
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public function afterMaking(Move ...$moves): Puzzle |
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{ |
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return new self( |
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$this->room->afterPushing(...$moves), |
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$this->target, |
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$this->moves->add(...$moves) |
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); |
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} |
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public function isSolved(): bool |
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{ |
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return $this->room->isSolvedFor($this->target); |
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} |
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public function movesSoFar(): Moves |
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{ |
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return $this->moves; |
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} |
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public function possibleMoves(): Moves |
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{ |
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return new Moves(...$this->room->possiblePushes()); |
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} |
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public function minimumDistanceToGoal(): int |
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{ |
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return $this->room->minimumDistanceToGoalFor($this->target); |
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} |
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} |
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Stratadox /
PuzzleSolver
