bool ChessMove::IsValidCastleMove(const ChessBoard& board) const{
ChessPiece* king = board.GetPiece(startX, startY);
if (king->GetMoveCount() != 0) return false;
if (abs(startX-endX) != 2 || startY != endY) return false;
int x = 7;
int delta = 1;
if (startX > endX){
x = 0;
delta = -1;
}
ChessPiece* rook = board.GetPiece(x, startY);
if (rook && rook->GetMoveCount() != 0) return false;
ChessColor opposingColor = SwitchColor(king->GetColor());
for (int i = startX; GetCondition(i, startX, x); i += delta){
if ((board.GetPiece(i, startY) && i != startX)
|| board.UnderAttack(opposingColor,i,startY)) return false;
}
return true;
}
bool ChessMove::IsValidEnPassantMove(const ChessBoard& board, int delta, int startingRow) const{
if (startY != startingRow+delta*3 || abs(startX-endX) != 1 || startY+delta != endY) return false;
if (board.GetPiece(endX, endY)) return false;
ChessPiece* potentialPawn = board.GetPiece(endX, startY);
return potentialPawn && potentialPawn->GetRank()==PAWN && potentialPawn->GetMoveCount()==1;
}