public static bool IsValidCell(int r, int c, CellStatus[,] cells)
{
if (r < 0 || r >= cells.GetLength(0))
return false;
if (c < 0 || c >= cells.GetLength(1))
return false;
return true;
}
internal static bool IsPlayerFirstMove(CellStatus[,] cells, Color color)
{
CellStatus status = GetStatusFromPlayer(color);
for (int row = 0; row < cells.GetLength(0); row++)
{
for (int col = 0; col < cells.GetLength(1); col++)
{
if (cells[row, col] == status)
return false;
}
}
return true;
}
public static bool BoardIsEmpty(CellStatus[,] status)
{
for (int i = 0; i < status.GetLength(1); i++)
{
if (status[0, i] != CellStatus.Empty)
return false;
}
return true;
}
private string RepresentWorkingSet(CellStatus[,] workingSet)
{
var sb = new StringBuilder();
for (var i = 0; i < workingSet.GetLength(0); i++)
{
for (var j = 0; j < workingSet.GetLength(1); j++)
{
switch (workingSet[i, j])
{
case CellStatus.Free:
sb.Append("_");
break;
case CellStatus.NotAvailableForPlacement:
sb.Append("0");
break;
case CellStatus.ShipPart:
sb.Append("X");
break;
}
}
sb.Append(Environment.NewLine);
}
return sb.ToString();
}
public override int Move(CellStatus[,] cells)
{
CellStatus target = GetTargetColor();
int nRows = cells.GetLength(0);
int nCols = cells.GetLength(1);
// if board is empty start in the middle
if (PlayInTheMiddle(cells))
return (int)Math.Ceiling(nCols / 2.0);
Combination best = new Combination()
{
Lenght = 0
};
for (int r = 0; r < nRows; r++)
{
int counter = 0;
for (int c = 0; c < nCols; c++)
{
if (cells[r, c] != target)
{
if (counter > best.Lenght)
{
List<int> colToStop = new List<int>();
// check if the sequence can be stopped here!
if (Utils.CanPlaceDiskAt(r, c, cells))
{
colToStop.Add(c);
}
// check if the sequence can be stopped on the other end
if (Utils.CanPlaceDiskAt(r, c - counter - 1, cells))
{
colToStop.Add(c - counter - 1);
}
if (colToStop.Count > 0)
{
best = new Combination()
{
Lenght = counter,
CanBeStopped = colToStop.Count > 0,
ColumnsToStop = colToStop,
};
}
}
counter = 0;
}
else
{
counter++;
}
}
}
for (int c = 0; c < nCols; c++)
{
int counter = 0;
for (int r = 0; r < nRows; r++)
{
if (cells[r, c] != target)
{
if (counter > best.Lenght)
{
List<int> colToStop = new List<int>();
// check if the sequence can be stopped here!
if (Utils.CanPlaceDiskAt(r, c, cells))
{
colToStop.Add(c);
}
if (colToStop.Count > 0)
{
best = new Combination()
{
Lenght = counter,
CanBeStopped = colToStop.Count > 0,
ColumnsToStop = colToStop,
};
}
}
counter = 0;
}
else
{
counter++;
}
}
}
// check diagonal backward
for (int c = 3; c < nCols + 2; c++)
{
int counter = 0;
for (int r = 0; r < nRows; r++)
{
int col = c - r;
int row = r;
if (col >= 0 && col < nCols)
{
if (cells[row, col] != target)
{
if (counter > best.Lenght)
{
List<int> colToStop = new List<int>();
// check if the sequence can be stopped here!
if (Utils.CanPlaceDiskAt(row, col, cells))
{
colToStop.Add(col);
}
// check if the sequence can be stopped on the other side!
if (Utils.CanPlaceDiskAt(row - counter - 1, col + counter + 1, cells))
{
colToStop.Add(col + counter + 1);
}
if (colToStop.Count > 0)
{
best = new Combination()
{
Lenght = counter,
CanBeStopped = colToStop.Count > 0,
ColumnsToStop = colToStop,
};
}
}
counter = 0;
}
else
{
counter++;
}
}
}
}
// check diagonal forward
for (int c = -2; c < nCols -3; c++)
{
int counter = 0;
for (int r = 0; r < nRows; r++)
{
int col = c + r;
int row = r;
if (col >= 0 && col < nCols)
{
if (cells[row, col] != target)
{
if (counter > best.Lenght)
{
List<int> colToStop = new List<int>();
// check if the sequence can be stopped here!
if (Utils.CanPlaceDiskAt(row, col, cells))
{
colToStop.Add(col);
}
// check if the sequence can be stopped on the other side!
if (Utils.CanPlaceDiskAt(row - counter - 1, col - counter - 1, cells))
{
colToStop.Add(col - counter - 1);
}
if (colToStop.Count > 0)
{
best = new Combination()
{
Lenght = counter,
CanBeStopped = colToStop.Count > 0,
ColumnsToStop = colToStop,
};
}
}
counter = 0;
}
else
{
counter++;
}
}
}
}
if (best.ColumnsToStop != null)
{
if (best.ColumnsToStop.Count == 1)
{
return best.ColumnsToStop[0];
}
else
{
double center = nCols / 2.0;
int closest = -1;
double closestDistance = double.MaxValue;
foreach (var col in best.ColumnsToStop)
{
double distance = col - center;
if (distance < closestDistance)
{
closest = col;
closestDistance = distance;
}
}
return closest;
}
}
else
{
// why does it end up here?
return new Random().Next(0, nCols);
}
}
public override int Move(CellStatus[,] status)
{
return _rand.Next(0, status.GetLength(1));
}
public static string ToFriendlyString(CellStatus[,] cells)
{
StringBuilder sb = new StringBuilder();
for (int i = cells.GetLength(0) - 1; i >= 0; i--)
{
StringBuilder row = new StringBuilder();
for (int j = 0; j < cells.GetLength(1); j++)
{
row.Append(cells[i, j]);
row.Append(",");
}
sb.AppendLine(row.ToString());
}
return sb.ToString();
}