/**
* Checks whether the given piece follow a long castle move
*
* @param Piece $piece the piece to check
* @param string $sq1 current position of the piece
* @param string $sq2 destination of the piece
*
* @return bool returns true if 'long castle' is valid or false otherwise
*/
private function _is_valid_long_castle($piece, $sq1, $sq2)
{
$player1 = $this->players[0];
$player2 = $this->players[1];
$player = $piece->get_player();
$board = $this->board;
$tsq = $player == $player1 ? "c1" : "c8";
if ($sq2 != $tsq) {
return false;
}
if ($piece->moved()) {
$this->message = ucfirst($player) . "'s king has already moved";
return false;
}
$rook == NULL;
if ($player == $player1) {
$rook = $board->get_piece_at("a1");
} else {
$rook = $board->get_piece_at("a8");
}
if ($rook == false || $rook->moved()) {
$this->message = ucfirst($player) . "'s queenside rook has already moved";
return false;
}
$rook_sq = $player == $player1 ? "a1" : "a8";
$king_sq = $player == $player1 ? "e1" : "e8";
$board_c = clone $board;
$board_c->set_piece_at($king_sq, NULL);
$board_c->set_piece_at($rook_sq, NULL);
if ($board_c->line_is_open($king_sq, $rook_sq) == false) {
$this->message = "There are pieces between " . ucfirst($player) . "'s king and rook";
return false;
}
return true;
}
