/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$pawnMoves = $game->getMovesByPiece($game->getBoard()->getSquare($walker->getStartingPosition())->getPiece()->getId());
if (empty($pawnMoves)) {
if ($game->getCurrentColor() === Color::WHITE && $walker->getRow() == 2 || $game->getCurrentColor() === Color::BLACK && $walker->getRow() == 7) {
$newPosition = $walker->peek(BoardWalker::DIRECTION_FORWARD, 1);
// allowed to make two steps forward
if ($newPosition && !$game->getBoard()->getSquare($newPosition)->getPiece()) {
$newPosition = $walker->peek(BoardWalker::DIRECTION_FORWARD, 2);
if ($newPosition && !$game->getBoard()->getSquare($newPosition)->getPiece()) {
// temporary check because walker does not seem to consider obstructing pieces of own color
$walker->jump(BoardWalker::DIRECTION_FORWARD, 2)->restart();
}
}
}
}
$walker->forward(1, false)->restart();
$forwardLeftCapture = $walker->peek(BoardWalker::DIRECTION_FORWARDLEFT, 1, null, false, true);
$forwardRightCapture = $walker->peek(BoardWalker::DIRECTION_FORWARDRIGHT, 1, null, false, true);
if ($forwardLeftCapture !== null) {
$walker->forwardLeft(1)->restart();
}
if ($forwardRightCapture !== null) {
$walker->forwardRight(1)->restart();
}
$this->walkEnPassant($walker, $game->getLastMove(false));
}
protected function createPersistableState(GameInterface $game, GameState $gameState, $class)
{
$persistableGameState = $this->createPersistableGameStateObject($class);
$squares = [];
foreach ($game->getBoard()->getSquares() as $square) {
$squareData = ['position' => $square->getPosition(), 'piece' => null];
if ($piece = $square->getPiece()) {
$squareData['piece'] = ['id' => $piece->getId(), 'type' => $piece->getType(), 'color' => $piece->getColor()];
}
$squares[] = $squareData;
}
$persistableGameState->setSquares($squares);
//$lastMove = $this->createMoveFromGameState($gameState);
$lastMove = $game->getLastMove();
if ($lastMove !== null) {
$persistableGameState->setFrom($lastMove->getFrom());
$persistableGameState->setTo($lastMove->getTo());
$persistableGameState->setPiece(['id' => $lastMove->getPiece()->getId(), 'type' => $lastMove->getPiece()->getType(), 'color' => $lastMove->getPiece()->getColor()]);
if (null !== ($capture = $lastMove->getCapture())) {
$persistableGameState->setCapture(['captured_id' => $capture->getCapturedPiece()->getId(), 'captured_type' => $capture->getCapturedPiece()->getType(), 'captured_color' => $capture->getCapturedPiece()->getColor(), 'capturing_id' => $capture->getPiece()->getId(), 'capturing_type' => $capture->getPiece()->getType(), 'capturing_color' => $capture->getPiece()->getColor(), 'position' => $capture->getPosition()]);
}
$persistableGameState->setMoveType($lastMove->getType());
$persistableGameState->setColor($lastMove->getPiece()->getColor());
}
return $persistableGameState;
}
/**
* @param MoveInterface $move
* @param GameInterface $game
*
* @return int|null
*/
private static function determineEnPassantType(MoveInterface $move, GameInterface $game)
{
if (null !== ($lastMove = $game->getLastMove())) {
if ($lastMove->getPiece()->getType() === PieceInterface::TYPE_PAWN) {
if (abs(BoardHelper::getColumnFromPosition($lastMove->getTo()) - BoardHelper::getColumnFromPosition($move->getFrom())) === 1 && abs(BoardHelper::getRowFromPosition($lastMove->getTo()) - BoardHelper::getRowFromPosition($lastMove->getFrom())) === 2 && BoardHelper::getRowFromPosition($move->getFrom()) === BoardHelper::getRowFromPosition($lastMove->getTo())) {
$toPiece = $game->getBoard()->getSquare($move->getTo())->getPiece();
$rowDiff = abs(BoardHelper::getRowFromPosition($move->getFrom()) - BoardHelper::getRowFromPosition($move->getTo()));
$columnDiff = abs(BoardHelper::getColumnFromPosition($move->getFrom()) - BoardHelper::getColumnFromPosition($move->getTo()));
if ($rowDiff === 1 && $columnDiff === 1) {
if ($toPiece === null) {
// en passant capture
return MoveInterface::TYPE_CAPTURE_EN_PASSANT;
} else {
return MoveInterface::TYPE_CAPTURE;
}
}
}
}
}
return null;
}
