public void computerMove(PieceColour colour)
{
//TODO: Figure out why computer modifies the entire board when checking states, then finally moves a piece that's not theirs.
gameState.Clear();
gameState = Board.board;
StateNode sn = new StateNode();
Tuple <char, int, char, int> move = sn.miniMax(gameState, colour);
Point pieceToMove = new Point(move.Item1, move.Item2);
Point positionToMoveTo = new Point(move.Item3, move.Item4);
Logic.ExecuteMove(pieceToMove, positionToMoveTo);
Console.WriteLine($"Moved {Board.board[positionToMoveTo].type} from {pieceToMove.X}{pieceToMove.Y} to {positionToMoveTo.X}{positionToMoveTo.Y}");
}
private void GenerateStates(StateNode root, int depth, PieceColour startingPlayer)
{
var ownPieces = root.gs.state.Where(o => o.Value.colour == startingPlayer).ToList();
List <Point> possibleMoves = root.gs.state.Keys.ToList();
foreach (var ownPieceKV in ownPieces)
{
foreach (var possiblePosition in possibleMoves)
{
if (depth > 0 && logic.CheckMove(startingPlayer, ownPieceKV.Key, possiblePosition, root.gs))
{
if (IsTerminalState(root.gs, startingPlayer) == false)
{
logic.ExecuteMove(ownPieceKV.Key, possiblePosition, root.gs);
if (!logic.KingCheck(startingPlayer, root.gs))
{
var copiedGameState = root.gs.Copy();
copiedGameState.currentPlayer = (startingPlayer == PieceColour.Blue) ? PieceColour.Red : PieceColour.Blue;
var newNode = new StateNode();
newNode.gs = copiedGameState;
newNode.parent = root;
root.children.Add(newNode);
newNode.action = Tuple.Create(ownPieceKV.Key.X, ownPieceKV.Key.Y, possiblePosition.X, possiblePosition.Y);
GenerateStates(newNode, depth - 1, copiedGameState.currentPlayer);
logic.Reverse(root.gs);
}
}
}
}
}
if (root.children.Count == 0)
{
root.minimaxValue = Utility(root, root.player);
}
else
{
if (root.player == PieceColour.Blue)
{
var max = int.MinValue;
foreach (var child in root.children)
{
if (child.minimaxValue > max)
{
max = child.minimaxValue;
root.action = child.action;
}
}
root.minimaxValue = max;
}
else
{
var min = int.MaxValue;
foreach (var child in root.children)
{
if (child.minimaxValue < min)
{
min = child.minimaxValue;
root.action = child.action;
}
}
root.minimaxValue = min;
}
}
}
private int Utility(StateNode root, PieceColour playerColour)
{
return(logic.BoardCheck(player, root.gs));
}
