private Step(Step step, Tuple<IEnumerable<Cell>, int> pointsNCells)
{
height = step.height;
width = step.width;
commandIndex = step.commandIndex + 1;
points = step.points + pointsNCells.Item2;
Pieces = step.Pieces;
CurrentPieceCells = Pieces[step.pieceIndex].Cells;
UsedCells = pointsNCells.Item1.ToImmutableHashSet();
Center = GetShift(CurrentPieceCells);
RunningCells = CurrentPieceCells.Select(c => new Cell(c + Center)).ToImmutableHashSet();
pieceIndex = (step.pieceIndex + 1) % step.Pieces.Count;
}
private Step(Step step)
{
height = step.height;
width = step.width;
pieceIndex = step.pieceIndex;
commandIndex = step.commandIndex + 1;
points = step.points;
Center = step.Center;
Pieces = step.Pieces;
CurrentPieceCells = step.CurrentPieceCells;
UsedCells = step.UsedCells;
RunningCells = step.RunningCells;
}
private Step(Step step, IEnumerable<Cell> cells, IEnumerable<Cell> rotateCells, Cell newCenter)
{
height = step.height;
width = step.width;
pieceIndex = step.pieceIndex;
commandIndex = step.commandIndex + 1;
points = step.points;
Center = newCenter;
Pieces = step.Pieces;
CurrentPieceCells = rotateCells.ToImmutableList();
UsedCells = step.UsedCells;
RunningCells = cells.ToImmutableHashSet();
}
public void Run()
{
var step = new Step(field);
commands.ToCharArray().Aggregate(step, (current, command) => current.NextStep(command));
}