/// <summary>
/// Checks the 4 neighbours of the provided cell
/// and adds the neighbour to the list of possible neighbour cells
/// </summary>
/// <param name="direction">The direction to search towards</param>
/// <param name="cell">The cell to search among the neighbours of.</param>
/// <param name="cageIndex">The cage index to search in.</param>
/// <param name="addingNeighbourToCageOfCell">
/// Whether we want to add a neighbourcell to the cage of the current cell, or
/// we want to add the current cell into the neighbour's cage.
/// </param>
private void CollectCell(Direction direction, Cell cell, int cageIndex, bool addingNeighbourToCageOfCell)
{
Cell alteredCell = cell.WithAlteredIndecesByDirection(direction);
int row = alteredCell.Row;
int col = alteredCell.Col;
if (addingNeighbourToCageOfCell
/* If we want to join one of the neighbour cells to the cage of "cell".
* If the neighbour is in any of the cages, and the neighbour cell is in the cage of "cell".*/
? !se.Killer.IsCellInAnyCage(row, col) && !IsCageContainValue(se.Solution[row, col], cageIndex, se.Solution)
/* If we want to join "cell" to the cage of one of the neighbour cells.
* This can happen when "cell" is left empty, and the cells around it are already in a cage.
* If the neighbour is in a cage, and the cage of the neighbour cell doesn't contain the value of "cell".*/
: se.Killer.IsCellInAnyCage(row, col) && !IsCageContainValue(se.Solution[cell.Row, cell.Col], se.Killer.CageIndeces[row, col], se.Solution))
possibleNeighbourCells.Add(new Cell(row, col));
}