Code for block placement in grid

CalculateBlockPlacement.cs

	public readonly struct CellPosGrade
	{
		public readonly int X;
		public readonly int Y;
		public readonly int Grade;
		public CellPosGrade(int x, int y, int grade)
		{
			X = x;
			Y = y;
			Grade = grade;
		}
	}

public record BlockData
{
	public Vector2Int Size;
	public Vector2Int Center;
	public readonly List<BlockCell> ActiveCells = new();
	public readonly List<Sprite>  CellsImages = new();

	public void Clear()
	{
		ActiveCells.Clear();
		CellsImages.Clear();
	}
}


private readonly List<CellPosGrade> _fakeFillCellsNew = new();
private BlockData[] _blocksData;

		

private CalculationResult CalculateBlockPlacement(Vector2Int currentPosition, int blockIndex)
		{
			Vector2Int startPosition = currentPosition;

			var cells = new CellPosGrade[_blocksData[blockIndex].ActiveCells.Count];

			int count = 0;

			foreach (BlockCell blockCell in _blocksData[blockIndex].ActiveCells)
			{
				int nextX = startPosition.y + blockCell.X;
				int nextY = startPosition.x + blockCell.Y;

				if (nextX < 0 || nextY < 0 || nextX >= FieldSize.x || nextY >= FieldSize.y || _cells[nextY, nextX] > 0)
				{
					cells = new CellPosGrade[_blocksData[blockIndex].ActiveCells.Count];
					break;
				}
				
				cells[count] = new CellPosGrade(nextY, nextX, blockCell.Grade);
				count++;
			}

			return new CalculationResult( startPosition,  cells);
		}