public ReversiField PrepareField(Position?blackHole = null)
{
var size = 8;
var cells = new Cell[size, size];
for (int row = 0; row < size; row++)
{
for (int column = 0; column < size; column++)
{
var position = new Position(row, column);
if (position != blackHole)
{
cells[row, column] = new Cell();
}
}
}
var field = new ReversiField(cells);
field.GetCell("D4").Place(new Piece(Color.White));
field.GetCell("E5").Place(new Piece(Color.White));
field.GetCell("D5").Place(new Piece(Color.Black));
field.GetCell("E4").Place(new Piece(Color.Black));
return(field);
}
static void DrawField(ReversiField field, Color currentMove, List <PossibleMove> possibleMoves)
{
var delimiter = " ";
Console.Write($"{delimiter} ");
for (char letter = 'A'; letter <= 'H'; letter++)
{
Console.Write($"{letter}{delimiter}");
}
for (var row = 0; row <= 7; row++)
{
Console.WriteLine();
Console.Write($"{(row + 1)} ");
for (var column = 0; column <= 7; column++)
{
var position = new Position(row, column);
var cell = field.GetCell(position);
DrawCell(cell, position);
}
}
void DrawCell(Cell cell, Position position)
{
string code;
if (cell.HasPiece)
{
code = cell.Piece.Color == Color.Black ? "B" : "W";
}
else
{
code = possibleMoves.Any(move => move.Position.Equals(position) && move.Color == currentMove)
? "+"
: ".";
}
Console.Write($"{code} ");
}
Console.WriteLine();
}
public IEnumerable <PossibleMove> GetPossibleMoves(ReversiField field)
{
foreach (var(position, cell) in field.AllCells())
{
if (cell.HasPiece)
{
continue;
}
var streaks = streakFinder.GetStreaksFor(position, field);
foreach (var streak in streaks)
{
var firstPoint = streak[0];
var firstPieceOppositeColor = firstPoint.Piece.Color.Opposite();
if (streak.Count > 1 &&
streak.Any(c => c.HasPiece && c.Piece.Color == firstPieceOppositeColor))
{
yield return(new PossibleMove(position, firstPieceOppositeColor));
}
}
}
}
public IEnumerable <List <Cell> > GetStreaksFor(Position origin, ReversiField field)
{
var directionOffsets = new List <Position>();
for (var x = -1; x <= 1; x++)
{
for (var y = -1; y <= 1; y++)
{
if (x != 0 || y != 0)
{
directionOffsets.Add(new Position(x, y));
}
}
}
foreach (var offset in directionOffsets)
{
var streak = new List <Cell>();
Cell next;
var nextPosition = origin;
do
{
nextPosition += offset;
next = field.GetCell(nextPosition);
if (next != null && next.HasPiece)
{
streak.Add(next);
}
} while (next != null && next.HasPiece);
if (streak.Any())
{
yield return(streak);
}
}
}
