bool ChessMove::IsValidMove(const ChessBoard& board) const{
if (endX < 0 || endX > 7 || endY < 0 || endY > 7)
return false;
ChessPiece* startPiece = board.GetPiece(startX, startY);
ChessPiece* occupyingPiece = board.GetPiece(endX, endY);
ChessColor color = startPiece->GetColor();
if (occupyingPiece && occupyingPiece->GetColor() == color)
return false;
switch (startPiece->GetRank()){
case PAWN:
return IsValidMovePawn(board) || IsValidEnPassantMove(board, GetDelta(color), GetStartingRow(color));
case ROOK:
return IsValidMoveRook(board);
case KNIGHT:
return IsValidMoveKnight();
case BISHOP:
return IsValidMoveBishop(board);
case QUEEN:
return IsValidMoveBishop(board) || IsValidMoveRook(board);
case KING:
return IsValidMoveKing() || IsValidCastleMove(board);
}
return false;
}
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;
}