private void AddTakeMoves(FindTakeMovesParameter takeMoveInfo, List<string> moves, Cell cell, string path)
{
var takeMoves = GetSingleTakeMoves(takeMoveInfo, cell);
if (takeMoves.Count == 0 && !string.IsNullOrEmpty(path))
{
moves.Add(path);
return;
}
if (string.IsNullOrEmpty(path)) path = cell.ToString();
foreach (var takeMove in takeMoves)
{
takeMoveInfo.AddAlreadyTaken(takeMove.SquareTaken);
var newPieceType = (cell.Type == PieceType.Simple &&
IsTurnToKingHorizontal(_position.CurrentColor, takeMove.SquareToMove.Y)
? PieceType.King
: cell.Type);
var newPiece = new Piece(newPieceType, cell.Color);
var newCell = new Cell(takeMove.SquareToMove, newPiece);
AddTakeMoves(takeMoveInfo, moves, newCell, path + "-" + takeMove.SquareToMove);
takeMoveInfo.RemoveLastAlreadyTaken();
}
}
private List<TakeMove> GetSingleTakeMoves(FindTakeMovesParameter takeMoveInfo, Cell cell)
{
var result = new List<TakeMove>();
foreach (var direction in _directions.AllDirections())
{
result.AddRange(AddTakeMoves(takeMoveInfo, cell, direction));
}
return result;
}
private IEnumerable<TakeMove> AddTakeMoves(FindTakeMovesParameter takeMoveInfo, Cell cell, IDirection direction)
{
int distance = cell.Type == PieceType.King ? 0 : 2;
var squares = _boardGeometry.GetCellsByDirection(cell, direction, distance);
bool isTaken = false;
var result = new List<TakeMove>();
ISquare cellTaken = null;
foreach (var square in squares)
{
if (isTaken)
{
if (!_position.SquareIsEmpty(square) && !square.IsEqualTo(takeMoveInfo.StartCell)) break;
result.Add(new TakeMove {SquareTaken = cellTaken, SquareToMove = square});
}
else
{
if (_position.SquareIsColor(square, takeMoveInfo.StartCell.Color.GetOppositeColor()))
{
if (takeMoveInfo.IsAlreadyTaken(square)) break;
isTaken = true;
cellTaken = square;
}
}
}
return result;
}