private static bool HideItems(GameFieldModel model, Random rand, CancellationToken token)
{
var orderedPairs = model.GetAllPairs();
var pairs = rand.Shake(orderedPairs);
var rank = 1;
const int maxRank = 2;
do
{
var pair = GetAvailableToHidePair(model, pairs, token, rank);
if (pair == null)
{
if (rank == maxRank)
break;
rank++;
orderedPairs = model.GetAllPairs().Where(model.GetItemVisible);
pairs = rand.Shake(orderedPairs);
}
else
{
pairs.Remove(pair);
}
}
while(true);
return model.VisibleCount <= maxVisibleNumbers;
}