/// <summary>
/// Enumerate all legal moves in the current board position
/// </summary>
/// <param name="dest">Destination list into which moves will be added</param>
/// <param name="game">Current game state</param>
/// <param name="moveOrder">Order in which board positions will be considered</param>
public static void EnumerateMoves(IList <IMove> dest, GameState game, IList <BoardPosition> moveOrder)
{
int player = game.Ply & 1;
if (game.Ply < 2)
{
// place enemy flat stone on empty squares
player = player ^ 1;
foreach (var pos in moveOrder)
{
if (!game[pos].HasValue)
{
dest.Add(new PlacePieceMove(Piece.MakePieceID(Piece.Stone_Flat, player), pos, true, false));
}
}
}
else
{
// place stones on empty squares
var sremain = game.StonesRemaining[player];
var cremain = game.CapRemaining[player];
foreach (var pos in moveOrder)
{
if (!game[pos].HasValue)
{
if (sremain > 0)
{
dest.Add(new PlacePieceMove(Piece.MakePieceID(Piece.Stone_Flat, player), pos, true, false));
dest.Add(new PlacePieceMove(Piece.MakePieceID(Piece.Stone_Standing, player), pos, true, false));
}
if (cremain > 0)
{
dest.Add(new PlacePieceMove(Piece.MakePieceID(Piece.Stone_Cap, player), pos, true, false));
}
}
}
// Move stacks
foreach (var pos in moveOrder)
{
var stack = game.Board[pos.X, pos.Y];
if (stack.Count == 0)
{
continue;
}
var topPiece = stack[stack.Count - 1];
var topStone = Piece.GetStone(topPiece);
if (Piece.GetPlayerID(topPiece) != player)
{
continue;
}
for (int pickupCount = 1; pickupCount <= Math.Min(stack.Count, game.Size); pickupCount++)
{
var pickupMove = new PickUpMove(pos, pickupCount, game);
var template = new PickupAndPlaceMove(pickupMove);
for (int dir = 0; dir < 4; dir++)
{
EnumUnstackMoves(dest, game, template, 0, pos, dir);
}
}
}
}
}
/// <summary>
/// Start building the PickupAndPlaceMove by starting with just the PickUpMove
/// </summary>
public PickupAndPlaceMove(PickUpMove pickupMove)
{
base.AddToChain(pickupMove);
}