/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$walker->omnidirectional(1);
$kingPosition = BoardHelper::getKingPosition($game->getBoard(), $game->getCurrentColor());
$kingColumn = BoardHelper::getColumnFromPosition($kingPosition);
$kingRow = BoardHelper::getRowFromPosition($kingPosition);
$board = $game->getBoard();
$king = $board->getSquare($kingPosition)->getPiece();
$track = $kingPosition === SquareInterface::POSITION_E1;
// check for possible castle move
if (empty($game->getMovesByPiece($king->getId()))) {
// see if one of the rooks did not make any moves
$rookCriteria = ['piece_type' => PieceInterface::TYPE_ROOK, 'piece_color' => $game->getCurrentColor()];
foreach ($board->getPiecesBy($rookCriteria) as $rookPosition => $rook) {
if (empty($game->getMovesByPiece($rook->getId()))) {
// see if there are no pieces between the king and this rook
$rookColumn = BoardHelper::getColumnFromPosition($rookPosition);
$columnDiff = abs($kingColumn - $rookColumn) - 1;
$track = $track === true && $columnDiff === 3;
if ($columnDiff > 1) {
$skip = false;
for ($x = 1; $x <= $columnDiff; $x++) {
if ($rookColumn > $kingColumn) {
$cursor = $rookColumn - $x . $kingRow;
} else {
$cursor = $rookColumn + $x . $kingRow;
}
if (null !== ($piece = $board->getSquare($cursor)->getPiece())) {
$skip = true;
break;
}
}
if ($skip) {
continue;
}
if ($kingColumn > $rookColumn) {
if ($game->getCurrentColor() === Color::WHITE) {
$walker->jump(BoardWalker::DIRECTION_LEFT, 2);
} else {
$walker->jump(BoardWalker::DIRECTION_RIGHT, 2);
}
} else {
if ($game->getCurrentColor() === Color::WHITE) {
$walker->jump(BoardWalker::DIRECTION_RIGHT, 2);
} else {
$walker->jump(BoardWalker::DIRECTION_LEFT, 2);
}
}
}
}
}
}
}
/**
* @param Move[] $moves
* @param int $ownColor
* @param BoardInterface $board
*
* @return Move[]
*/
private function filterOwnKingChecks(array $moves, $ownColor, BoardInterface $board)
{
$opposingColor = $ownColor === Color::WHITE ? Color::BLACK : Color::WHITE;
$safeMoves = [];
foreach ($moves as $move) {
$futureBoard = $this->mockMove($move, $board);
$checksKing = false;
$ownKingPosition = BoardHelper::getKingPosition($futureBoard, $ownColor);
foreach ($board->getSquaresBy(['piece_color' => $opposingColor]) as $square) {
foreach ($this->possibleMovesFrom($square->getPosition(), $futureBoard, false, true) as $miscMove) {
if ($miscMove->getTo() == $ownKingPosition) {
$checksKing = true;
break 2;
}
}
}
if ($checksKing === false) {
$safeMoves[] = $move;
}
}
return $safeMoves;
}
