private unsafe int ScoreForGrid(GridStack stack, int depth)
{
int permutations = GridFunctions.CountEmptySquares(stack.current);
if (permutations == 0)
{
return(0);
}
int startIndex = 0;
int score = int.MaxValue;
for (int i = 0; i < permutations; i++)
{
stack.pushCurrent();
GridFunctions.TryAddPermutation(stack.current, ref startIndex);
//if(!success)
//{
// //GridFunctions.printGrid(grid);
// //GridFunctions.printGrid((grids + i * 16));
// //GridFunctions.TryAddPermutation((grids + i * 16), startIndex, out startIndex);
// throw new Exception();
//}
startIndex++;
int subScore = -1;
foreach (Direction subDirection in Enum.GetValues(typeof(Direction)))
{
stack.pushCurrent();
GridFunctions.CollapseGridInPlace(stack.current, subDirection);
if (depth == 1)
{
subScore = Math.Max(subScore, FinalScoreForGrid(stack.current));
}
else
{
subScore = Math.Max(subScore, ScoreForGrid(stack, depth - 1));
}
stack.pop();
}
stack.pop();
score = Math.Min(score, subScore);
}
return(score);
}
