private IEnumerable<Move> CalculatePawnMoves()
{
var direction = Turn == "w" ? 1 : -1;
var pawns = Pieces.Where(x => x.Value.StartsWith(Turn) && x.Value.EndsWith("p"))
.Select(x => ConvertFromChessCoordinateToXy(x.Key)).ToList();
Func<int, bool> isInStartPosition = yPosition =>
{
if (Turn == "w" && yPosition == 1) return true;
return Turn == "b" && yPosition == 6;
};
var moves = new List<Move>();
foreach (var piece in pawns)
{
for (var i = 1; i <= 2; ++i)
{
var move = new Move(piece.X, piece.Y, piece.X, piece.Y + i * direction);
if (!IsInside(move) || Board[move.X2, move.Y2] != null) break;
moves.Add(move);
if (!isInStartPosition(piece.Y)) break;
}
}
foreach (var pos in new[] { -1, 1 })
{
var captureMoves = pawns.Select(p => new Move(p.X, p.Y, p.X + pos, p.Y + direction))
.Where(IsInside)
.Where(p => Board[p.X2, p.Y2] != null && Board[p.X2, p.Y2].StartsWith(Opponent));
moves.AddRange(captureMoves);
}
return moves;
}
private IEnumerable<Move> CalculateBishopMoves(string pieceName = "b")
{
var bishops = Pieces.Where(x => x.Value.StartsWith(Turn) && x.Value.EndsWith(pieceName))
.Select(x => ConvertFromChessCoordinateToXy(x.Key)).ToList();
var moves = new List<Move>();
foreach (var bishop in bishops)
{
foreach (var xDirection in new[] { 1, -1 })
{
foreach (var yDirection in new[] { 1, -1 })
{
var x = xDirection;
var y = yDirection;
Move move;
while (IsInside((move = new Move(bishop.X, bishop.Y, bishop.X + x, bishop.Y + y))))
{
if (Board[move.X2, move.Y2] == null)
{
moves.Add(move);
}
else
{
if (Board[move.X2, move.Y2].StartsWith(Opponent))
{
moves.Add(move);
}
break;
}
x += xDirection;
y += yDirection;
}
}
}
}
return moves;
}
private static bool IsInside(Move m)
{
return m.X2 >= 0 && m.X2 <= 7 && m.Y2 >= 0 && m.Y2 <= 7;
}
