/// <summary>
/// Disarms a cell and adds a mine to a random empty cell.
/// Used if the first open cell by the user is a cell with mine.
/// </summary>
/// <param name="cellToDisarm">The cell to disarm.</param>
private void DisarmFirstCell(ICell cellToDisarm)
{
// Store every cell without mine
var emptyCells = new List <ICell>();
for (int i = 0; i < this.Cells.Count; i++)
{
if (!this.Cells[i].IsMined)
{
emptyCells.Add(this.Cells[i]);
}
}
if (emptyCells.Count == 0)
{
throw new InvalidOperationException("Cannot disarm a cell because all other cells have mines!");
}
// Add mine to a random empty cell
int j = this.RandomGenerator.Next(emptyCells.Count);
emptyCells[j].AddMine();
// Disarm the first cell and recalculate the neighbor mines count
cellToDisarm.Disarm();
this.allNeighborMines = this.CalculateNeighborMines();
}