/**
* {@inheritdoc}
*/
public function possibleCapturesBy($color, BoardInterface $board)
{
$moves = [];
$criteria = ['piece_color' => $color];
foreach ($board->getSquaresBy($criteria) as $square) {
$moves = array_merge($moves, $this->possibleCapturesFrom($square->getPosition(), $board));
}
return $moves;
}
/**
* {@inheritdoc}
*/
public function __construct(PlayerInterface $whitePlayer, PlayerInterface $blackPlayer, BoardInterface $board, $id = null)
{
if ($whitePlayer->getColor() !== Color::WHITE) {
throw new \LogicException("Given white player's PlayerInterface should have a white color");
}
if ($blackPlayer->getColor() !== Color::BLACK) {
throw new \LogicException("Given black player's PlayerInterface should have a black color");
}
$board->setGame($this);
$this->whitePlayer = $whitePlayer;
$this->blackPlayer = $blackPlayer;
$this->board = $board;
$this->id = $id ?: uniqid();
$this->states = new ArrayCollection();
}
/**
* @param BoardInterface $board
* @param bool $flipped
*
* @return string
*/
public static function toAscii(BoardInterface $board, $flipped = false)
{
$squaresByRow = $board->getIndexedSquares('row');
$ascii = '';
if ($flipped !== true) {
$squaresByRow = array_reverse($squaresByRow, true);
}
$previousRow = null;
foreach ($squaresByRow as $row => $squares) {
if ($previousRow !== $row) {
if ($previousRow !== null) {
$ascii .= "\n";
}
$ascii .= sprintf('%d ║', $row);
}
/** @var Square[] $squares */
foreach ($squares as $square) {
if (null !== ($piece = $square->getPiece())) {
$ascii .= PieceDecorator::toAscii($piece);
} else {
$ascii .= '…';
}
$ascii .= ' ';
}
$ascii = rtrim($ascii);
$previousRow = $row;
}
$ascii .= "\n";
$columnLabels = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
$ascii .= ' ╚' . str_repeat('═', count($columnLabels) * 2 - 1) . "\n";
$ascii .= ' ';
foreach ($columnLabels as $columnLabel) {
$ascii .= $columnLabel . ' ';
}
$ascii .= "\n";
return $ascii;
}
/**
* @param int $direction The direction to step into
* @param int $jumps The number of jumps to make in this direction
* @param int|null $startingPosition
* @param bool $ignoreCapture
*
* @return int|null The expected position, or null if the move is not possible
*
* @throws \InvalidArgumentException
*/
public function peek($direction, $jumps = 1, $startingPosition = null, $ignoreCapture = false, $requireAttack = false)
{
$newPosition = null;
if ($startingPosition !== null) {
$column = BoardHelper::getColumnFromPosition($startingPosition);
$row = BoardHelper::getRowFromPosition($startingPosition);
} else {
$column = $this->getColumn();
$row = $this->getRow();
}
switch ($direction) {
case self::DIRECTION_FORWARD:
if ($this->color === Color::WHITE) {
$newRow = $this->formatNumber($row + $jumps);
} else {
$newRow = $this->formatNumber($row - $jumps);
}
if ($newRow !== null) {
$newPosition = intval($column . $newRow);
}
break;
case self::DIRECTION_FORWARDRIGHT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column + $jumps);
$newRow = $this->formatNumber($row + $jumps);
} else {
$newColumn = $this->formatNumber($column - $jumps);
$newRow = $this->formatNumber($row - $jumps);
}
if ($newColumn !== null && $newRow !== null) {
$newPosition = intval($newColumn . $newRow);
}
break;
case self::DIRECTION_RIGHT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column + $jumps);
} else {
$newColumn = $this->formatNumber($column - $jumps);
}
if ($newColumn !== null) {
$newPosition = intval($newColumn . $row);
}
break;
case self::DIRECTION_BACKWARDRIGHT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column + $jumps);
$newRow = $this->formatNumber($row - $jumps);
} else {
$newColumn = $this->formatNumber($column - $jumps);
$newRow = $this->formatNumber($row + $jumps);
}
if ($newColumn !== null && $newRow !== null) {
$newPosition = intval($newColumn . $newRow);
}
break;
case self::DIRECTION_BACKWARD:
if ($this->color === Color::WHITE) {
$newRow = $this->formatNumber($row - $jumps);
} else {
$newRow = $this->formatNumber($row + $jumps);
}
if ($newRow !== null) {
$newPosition = intval($column . $newRow);
}
break;
case self::DIRECTION_BACKWARDLEFT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column - $jumps);
$newRow = $this->formatNumber($row - $jumps);
} else {
$newColumn = $this->formatNumber($column + $jumps);
$newRow = $this->formatNumber($row + $jumps);
}
if ($newColumn !== null && $newRow !== null) {
$newPosition = intval($newColumn . $newRow);
}
break;
case self::DIRECTION_LEFT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column - $jumps);
} else {
$newColumn = $this->formatNumber($column + $jumps);
}
if ($newColumn !== null) {
$newPosition = intval($newColumn . $row);
}
break;
case self::DIRECTION_FORWARDLEFT:
if ($this->color === Color::WHITE) {
$newColumn = $this->formatNumber($column - $jumps);
$newRow = $this->formatNumber($row + $jumps);
} else {
$newColumn = $this->formatNumber($column + $jumps);
$newRow = $this->formatNumber($row - $jumps);
}
if ($newColumn !== null && $newRow !== null) {
$newPosition = intval($newColumn . $newRow);
}
break;
default:
throw new \InvalidArgumentException(sprintf('Unknown direction to calculate: %s', $direction));
}
if ($ignoreCapture !== true && $newPosition !== null) {
$toPiece = $this->board->getSquare($newPosition)->getPiece();
if (null !== $toPiece) {
if ($toPiece->getColor() === $this->getColor()) {
// own piece, can't capture
return null;
}
} elseif ($requireAttack === true) {
return null;
}
}
return $newPosition;
}
/**
* @param BoardInterface $board
* @param int $color
*
* @return int
*/
public static function getKingPosition(BoardInterface $board, $color)
{
$kingSquares = $board->getSquaresBy(['piece_type' => PieceInterface::TYPE_KING, 'piece_color' => $color]);
if (count($kingSquares) !== 1) {
throw new \RuntimeException(sprintf('There should always be one king of a given color on the board, found %d', count($kingSquares)));
}
return reset($kingSquares)->getPosition();
}
/**
* @param BoardInterface $board
*
* @return array
*/
private function getExpectedBoardArray(BoardInterface $board)
{
$squares = [];
foreach ($board->getSquares() as $square) {
$squares[$square->getPosition()] = ['position' => $square->getPosition(), 'color' => $square->getColor(), 'piece' => $this->getExpectedPieceArray($square->getPiece())];
}
return ['squares' => $squares];
}
