/// <summary>
/// This method is handling the movement of the tiles in-game.
/// </summary>
/// <exception cref="TilePositionOutOfRangeException">
/// Thrown when the position of the tile is a negative number or exceeds the scope of the matrix
/// </exception>
/// <exception cref="InvalidTileNeighbourException">
/// Thrown when two given tiles are not valid neighbours.
/// </exception>
public static List <ITile> MoveTiles(List <ITile> tiles, int tileValue)
{
if (tileValue < 0 || tileValue > 15)
{
throw new TilePositionOutOfRangeException(Messages.TileOutOfRangeExceptionMessage);
}
List <ITile> resultMatrix = tiles;
ITile freeTile = tiles[GetFreeTilePosition(tiles)];
ITile tile = tiles[GetDestinationTilePosition(tiles, tileValue)];
bool areValidNeighbourTiles = MatrixGenerator.AreValidNeighbourTiles(freeTile, tile);
if (!areValidNeighbourTiles)
{
throw new InvalidTileNeighbourException(Messages.InvalidTileNeighbourExceptionMessage);
}
int targetTilePosition = tile.Position;
resultMatrix[targetTilePosition].Position = freeTile.Position;
resultMatrix[freeTile.Position].Position = targetTilePosition;
resultMatrix.Sort();
return(resultMatrix);
}
public void InvalidNeighbourTilesTest()
{
IList <ITile> tiles = new List <ITile>();
for (int index = 1; index < 16; index++)
{
tiles.Add(new Tile(index.ToString(), index - 1));
}
tiles.Add(new Tile(string.Empty, 15));
Assert.IsFalse(MatrixGenerator.AreValidNeighbourTiles(tiles[0], tiles[5]));
}