// default constructor
public GameState(GameState previousState, ChessMove lastMove)
{
if (previousState == null) // set GameState values for start of game
{
// initialize castling flags
wCanCastle00 = true;
wCanCastle000 = true;
bCanCastle00 = true;
bCanCastle000 = true;
// check to see if we have first move
if (lastMove == null)
{
// set default values
enPassant = -1;
hundredMoveDraw = 0;
theLastMove = new ChessMove();
}
else
{
// get en passant target square
enPassant = lastMove.GetEnPassant();
// check for pawn advancement, pawn promotion, or capture since last GameState
hundredMoveDraw = lastMove.GetHundredDrawUpdate(0);
// update theLastMove
theLastMove = lastMove;
}
}
else // set GameState values for non-starting game position
{
// update castling flags
wCanCastle00 = lastMove.GetWCastle00(previousState.wCanCastle00);
wCanCastle000 = lastMove.GetWCastle000(previousState.wCanCastle000);
bCanCastle00 = lastMove.GetBCastle00(previousState.bCanCastle00);
bCanCastle000 = lastMove.GetBCastle000(previousState.bCanCastle000);
// get en passant target square
enPassant = lastMove.GetEnPassant();
// check for pawn advancement, pawn promotion, or capture since last GameState
hundredMoveDraw = lastMove.GetHundredDrawUpdate(previousState.hundredMoveDraw);
// update theLastMove
theLastMove = lastMove;
}
// set state FEN
state_fen = AI.board.GetFENString();
}
