/**
* @param BoardWalker $walker
* @param MoveInterface $lastMove
*/
private function walkEnPassant(BoardWalker $walker, MoveInterface $lastMove = null)
{
$lastEnemyPiece = $lastMove ? $walker->getBoard()->getSquare($lastMove->getTo())->getPiece() : null;
if ($lastMove === null || $lastEnemyPiece === null || $lastEnemyPiece->getType() !== PieceInterface::TYPE_PAWN) {
return;
}
$leftToPosition = $walker->peek(BoardWalker::DIRECTION_LEFT, 1, null, true, false);
$rightToPosition = $walker->peek(BoardWalker::DIRECTION_RIGHT, 1, null, true, false);
if ($leftToPosition !== null) {
if (abs(BoardHelper::getRowFromPosition($lastMove->getFrom()) - BoardHelper::getRowFromPosition($leftToPosition)) !== 2) {
return;
}
if ($lastMove->getTo() === $leftToPosition) {
// en passant left
$walker->forwardLeft(1, false)->restart();
}
}
if ($rightToPosition !== null) {
if (abs(BoardHelper::getRowFromPosition($lastMove->getFrom()) - BoardHelper::getRowFromPosition($rightToPosition)) !== 2) {
return;
}
if ($lastMove->getTo() === $rightToPosition) {
// en passant left
$walker->forwardRight(1, false)->restart();
}
}
}
/**
* @param MoveInterface $move
*
* @return string
*/
public static function toNotation(MoveInterface $move)
{
if (null === $move->getPiece()) {
return '';
}
$notation = '';
$piece = $move->getPiece();
$toLabel = strtolower($move->getToLabel());
$isPawn = $piece->getType() === PieceInterface::TYPE_PAWN;
$pieceLetter = PieceDecorator::toLetter($piece);
if (null !== ($capture = $move->getCapture())) {
if ($isPawn) {
$column = BoardHelper::getColumnFromPosition($move->getFrom());
$pieceLetter = BoardHelper::columnNumberToLetter($column);
}
$notation .= sprintf('%sx%s', $pieceLetter, $toLabel);
if ($isPawn) {
if ($move->getType() === MoveInterface::TYPE_CAPTURE_EN_PASSANT) {
$notation .= 'e.p.';
}
}
return $notation;
}
if ($isPawn) {
return $toLabel;
}
return sprintf('%s%s', $pieceLetter, $toLabel);
}
/**
* @param MoveInterface $move
* @param bool $silentFailure
*/
public function add(MoveInterface $move, $silentFailure = false)
{
$piece = $move->getPiece();
if ($piece === null) {
throw new \InvalidArgumentException('You can only add moves to the registry that has a piece connected to it');
}
$moveData = $this->serialize($move->getTo());
$key = $this->getKey($move->getFrom(), $piece->getType(), $piece->getColor());
if (!array_key_exists($key, $this->moves)) {
$this->moves[$key] = [];
}
foreach ($this->moves[$key] as $existingMoveData) {
if ($existingMoveData === $moveData) {
if ($silentFailure === true) {
return;
}
throw new \InvalidArgumentException(sprintf('This move (%s) has already been registered with this key (%s)', $moveData, $existingMoveData));
}
}
$this->moves[$key][] = $moveData;
$this->fresh = false;
}
/**
* @param MoveInterface $move
* @param GameInterface $game
*
* @throws InvalidMoveException
*/
private static function validate(MoveInterface $move, GameInterface $game)
{
if ($game->hasFinished()) {
throw new InvalidMoveException('Game has already finished');
}
if (null === ($piece = $move->getPiece())) {
if (null === ($piece = $game->getBoard()->getSquare($move->getFrom())->getPiece())) {
var_export($game->getBoard()->getSquaresAsString());
throw new InvalidMoveException(sprintf('There must be a piece to move on that position: %s', $move->getFromLabel()));
}
}
if ($game->getCurrentColor() !== $piece->getColor()) {
throw new InvalidMoveException(sprintf('You can only move your own pieces: the %s on %s belongs to %s', $piece->getTypeLabel(), $move->getFromLabel(), $game->getOpposingPlayer()->getColor()));
}
}
/**
* {@inheritdoc}
*/
public function mockMove(MoveInterface $move, BoardInterface $board)
{
$deepCopy = new DeepCopy();
/** @var BoardInterface $futureBoard */
$futureBoard = $deepCopy->copy($board);
$fromSquare = $futureBoard->getSquare($move->getFrom());
$fromPiece = $fromSquare->getPiece();
$fromSquare->setPiece(null);
$futureBoard->getSquare($move->getTo())->setPiece($fromPiece);
return $futureBoard;
}
/**
* @param MoveInterface $move
*
* @return GameState
*/
private function createStateFromMove(MoveInterface $move)
{
if (!$move->getFrom()) {
return null;
}
$gameState = new GameState();
$gameState->setFrom($move->getFrom());
$gameState->setTo($move->getTo());
$gameState->setPiece($move->getPiece());
$gameState->setCapture($move->getCapture());
$gameState->setMoveType($move->getType());
return $gameState;
}