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<?php |
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declare(strict_types=1); |
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namespace CoenMooij\Sudoku\Puzzle; |
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use CoenMooij\Sudoku\Exception\InvalidValueException; |
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class Grid |
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{ |
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public const NUMBER_OF_ROWS = 9; |
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public const NUMBER_OF_COLUMNS = 9; |
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public const NUMBER_OF_BLOCKS = 9; |
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public const NUMBER_OF_LOCATIONS = 81; |
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public const POSSIBLE_VALUES = [1, 2, 3, 4, 5, 6, 7, 8, 9]; |
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public const EMPTY_VALUE = 0; |
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/** |
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* @var int[][] |
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*/ |
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private $grid; |
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public function __construct() |
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{ |
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$this->initializeGrid(); |
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} |
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public static function valueIsValid(int $value): bool |
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{ |
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return in_array($value, self::POSSIBLE_VALUES, true); |
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} |
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public function get(Location $location): int |
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{ |
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return $this->grid[$location->getRow()][$location->getColumn()]; |
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} |
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public function set(Location $location, int $value): void |
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{ |
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if (!self::valueIsValid($value)) { |
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throw new InvalidValueException(); |
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} |
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$this->grid[$location->getRow()][$location->getColumn()] = $value; |
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} |
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/** |
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* @return int[][] |
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*/ |
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public function getRows(): array |
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{ |
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$rows = []; |
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for ($i = 0; $i < self::NUMBER_OF_ROWS; $i++) { |
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$rows[] = $this->getRow($i); |
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} |
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return $rows; |
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} |
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/** |
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* @return int[] |
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*/ |
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public function getRow(int $row): array |
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{ |
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return $this->grid[$row]; |
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} |
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/** |
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* @return int[][] |
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*/ |
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public function getColumns(): array |
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{ |
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$columns = []; |
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for ($i = 0; $i < self::NUMBER_OF_COLUMNS; $i++) { |
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$columns[] = $this->getColumn($i); |
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} |
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return $columns; |
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} |
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/** |
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* @return int[] |
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*/ |
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public function getColumn(int $column): array |
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{ |
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$values = []; |
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for ($row = 0; $row < 9; $row++) { |
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$values[] = $this->grid[$row][$column]; |
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} |
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return $values; |
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} |
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/** |
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* @return int[][] |
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*/ |
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public function getBlocks(): array |
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{ |
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$blocks = []; |
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for ($i = 0; $i < self::NUMBER_OF_BLOCKS; $i++) { |
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$blocks[] = $this->getBlock($i); |
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} |
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return $blocks; |
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} |
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/** |
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* @return int[] |
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*/ |
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public function getBlock(int $block): array |
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{ |
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$row = $block - ($block % 3); |
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$column = ($block % 3) * 3; |
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return $this->getBlockAt(new Location($row, $column)); |
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} |
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/** |
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* @return int[] |
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*/ |
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public function getBlockAt(Location $location): array |
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{ |
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$firstLocation = $this->getFirstLocationInBlock($location); |
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$block = []; |
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for ($row = 0; $row < 3; $row++) { |
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for ($column = 0; $column < 3; $column++) { |
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$block[] = $this->grid[$firstLocation->getRow() + $row][$firstLocation->getColumn() + $column]; |
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} |
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} |
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return $block; |
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} |
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private function getFirstLocationInBlock(Location $location): Location |
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{ |
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$firstRowInBlock = $location->getRow() - $location->getRow() % 3; |
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$firstColumnInBlock = $location->getColumn() - $location->getColumn() % 3; |
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return new Location($firstRowInBlock, $firstColumnInBlock); |
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} |
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/** |
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* @return int[] |
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*/ |
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public function getAllPossibilitiesFor(Location $location): array |
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{ |
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if (!$this->isEmpty($location)) { |
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return []; |
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} |
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$impossibleValues = array_unique( |
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array_merge( |
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$this->getRow($location->getRow()), |
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$this->getColumn($location->getColumn()), |
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$this->getBlockAt($location) |
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) |
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); |
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return array_values(array_diff(self::POSSIBLE_VALUES, $impossibleValues)); |
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} |
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public function isEmpty($location): bool |
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{ |
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return $this->get($location) === self::EMPTY_VALUE; |
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} |
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public function empty(Location $location): void |
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{ |
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$this->grid[$location->getRow()][$location->getColumn()] = self::EMPTY_VALUE; |
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} |
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public function numberOfEmptyValues(): int |
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{ |
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$numberOfEmptyValues = 0; |
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foreach ($this->getRows() as $row) { |
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for ($i = 0; $i < self::NUMBER_OF_COLUMNS; $i++) { |
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$numberOfEmptyValues += ($row[$i] === self::EMPTY_VALUE); |
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} |
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} |
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return $numberOfEmptyValues; |
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} |
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private function initializeGrid(): void |
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{ |
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for ($row = 0; $row < self::NUMBER_OF_ROWS; $row++) { |
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for ($column = 0; $column < self::NUMBER_OF_COLUMNS; $column++) { |
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$this->empty(new Location($row, $column)); |
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} |
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} |
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} |
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} |
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coenmooij /
sudoku
