/// <summary>
/// Checks the values for a tile at a specific tileGridPosition.
/// If one value doesn't match the value within the tiles name false is returned,
/// while one null-value of the tileValueGrid values is allowed.
/// </summary>
/// <param name="tile">The tile whose values should be checked.</param>
/// <param name="tileGridPosition">The tiles position within the tileGrid.</param>
/// <returns>True, if values matching (one tileValueGrid value can be null), false if not.</returns>
private bool CheckValueGridAtTileGridPosition(TriominoTile tile, Point tileGridPosition)
{
List<int?> valuesToCheck = this.GetValueGridValuesFromNameGridPositions(tileGridPosition, tile.Orientation.ToArrayTileOrientation());
// if more than two values are null, this triomino tile
// isn't added adjacent to another tile (except for the first tile).
if (this.NumbTilesOnBoard > 0 && valuesToCheck.Where(v => !v.HasValue).Count() > 1)
{
return false;
}
string[] nameParts = tile.GetArrayName().Split('-');
for (int i = 0; i < valuesToCheck.Count; i++)
{
int intValue = int.Parse(nameParts[i]);
if (valuesToCheck[i].HasValue && valuesToCheck[i] != intValue)
{
return false;
}
}
return true;
}
private bool AddTile(TriominoTile tile, Point tileGridPosition)
{
if (this.tileGrid[tileGridPosition.Y, tileGridPosition.X] != null)
{
throw new ArgumentException($"Cannot add tile {tile.Name} at position(x,y): ({tileGridPosition.X}, {tileGridPosition.Y}). Place is taken by tile: '{this.tileGrid[tileGridPosition.Y, tileGridPosition.X].Name}'");
}
if (!this.CheckValueGridAtTileGridPosition(tile, tileGridPosition))
{
return false;
}
this.tileGrid[tileGridPosition.Y, tileGridPosition.X] = tile;
this.AddValuesToValueGrid(tile.GetArrayName(), tileGridPosition, tile.Orientation.ToArrayTileOrientation());
return true;
}