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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\NetworkNavigation; |
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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 json_decode; |
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final class NetworkNavigationPuzzle implements Puzzle |
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{ |
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/** @var string */ |
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private $heroLocation; |
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/** @var string */ |
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private $goalLocation; |
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/** @var float[][] */ |
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private $network; |
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/** @var Moves */ |
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private $moves; |
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private function __construct( |
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string $heroLocation, |
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string $goalLocation, |
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array $network, |
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Moves $moves |
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) { |
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$this->heroLocation = $heroLocation; |
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$this->goalLocation = $goalLocation; |
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$this->network = $network; |
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$this->moves = $moves; |
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} |
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public static function fromJsonAndStartAndGoal( |
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string $json, |
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string $start, |
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string $goal |
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): Puzzle { |
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$network = []; |
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foreach (json_decode($json, true) as $edge) { |
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$network[$edge['from']][$edge['to']] = $edge['cost']; |
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} |
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return self::fromArrayAndStartAndGoal($network, $start, $goal); |
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} |
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public static function fromArrayAndStartAndGoal( |
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array $network, |
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string $start, |
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string $goal |
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): Puzzle { |
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return new self($start, $goal, $network, Moves::none()); |
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} |
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public function representation(): string |
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{ |
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return $this->heroLocation; |
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} |
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public function afterMaking(Move ...$moves): Puzzle |
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{ |
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$move = end($moves); |
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if (!$move instanceof Jump) { |
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return $this; |
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} |
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$new = clone $this; |
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$new->heroLocation = $move->target(); |
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$new->moves = $this->moves->add(...$moves); |
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return $new; |
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} |
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public function isSolved(): bool |
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{ |
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return $this->heroLocation === $this->goalLocation; |
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} |
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public function movesSoFar(): Moves |
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{ |
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return $this->moves; |
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} |
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public function possibleMoves(): Moves |
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{ |
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$moves = []; |
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foreach ($this->network[$this->heroLocation] as $neighbour => $cost) { |
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$moves[] = Jump::to($neighbour, $cost); |
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} |
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return new Moves(...$moves); |
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} |
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} |
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Stratadox /
PuzzleSolver
