private IEnumerable <List <LineVariant> > GetVariantsWithSkippingGroup(int nextGroupIndex, int groupsCount,
int iteration,
IReadOnlyCollection <LineNumber> numbers, GroupVariant currentGroupVariant)
{
var variantsWithSkippingGroups = new List <List <LineVariant> >();
for (var i = nextGroupIndex + 1; i < groupsCount; i++)
{
var lineVariantWithSkipp = GetLineVariants(groupsCount, numbers.TakeLast(iteration).ToList(), i);
variantsWithSkippingGroups.Add(lineVariantWithSkipp);
}
foreach (var variant in variantsWithSkippingGroups.SelectMany(variants => variants))
{
variant.Variants.Add(currentGroupVariant);
}
return(variantsWithSkippingGroups);
}
private List <LineVariant> GetLineVariants(int groupsCount, IReadOnlyCollection <LineNumber> numbers,
int currentGroupIndex)
{
var resultLineVariants = new List <LineVariant>();
if (currentGroupIndex >= groupsCount)
{
return(new List <LineVariant>());
}
for (var j = 0; j < numbers.Count; j++)
{
var groupVariants = new List <GroupVariant>();
var groupVariant = new GroupVariant
{
GroupIndex = currentGroupIndex,
NumbersIndexes = numbers.Take(numbers.Count - j).Select(x => x.NumberIndex).ToList()
};
if (j == 0)
{
groupVariants.Add(groupVariant);
resultLineVariants.Add(new LineVariant
{
Variants = groupVariants
});
continue;
}
var nextGroupIndex = currentGroupIndex + 1;
var variantsWithoutSkippingGroups = GetLineVariants(groupsCount,
numbers.TakeLast(j).ToList(), nextGroupIndex);
var variantsWithSkippingGroups = GetVariantsWithSkippingGroup(nextGroupIndex, groupsCount, j,
numbers, groupVariant);
resultLineVariants.AddRange(variantsWithSkippingGroups.SelectMany(x => x));
if (!variantsWithoutSkippingGroups.Any())
{
continue;
}
groupVariants.AddRange(variantsWithoutSkippingGroups.FirstOrDefault()?.Variants !);
var variantsToAdd = variantsWithoutSkippingGroups.Skip(1).ToList();
foreach (var variant in variantsToAdd)
{
variant.Variants.Add(groupVariant);
}
resultLineVariants.AddRange(variantsToAdd.Select(variant => new LineVariant
{
Variants = variant.Variants
}));
groupVariants.Add(groupVariant);
resultLineVariants.Add(new LineVariant
{
Variants = groupVariants
});
}
return(resultLineVariants);
}