public void GetCombinations_WhenCalledWithCombination5_IsValid()
{
int[] basketItems = new int[] { 2, 2, 2, 1, 1 };
int bookCombinationNumber = 5;
var results = _basketHelper.GetCombinations(basketItems, bookCombinationNumber);
Assert.AreEqual(2, results.Count);
}
public List <List <int[]> > GetBasketCombinations(int[] basketItems, int numberOfBooksInSeries)
{
if (basketItems.Length != numberOfBooksInSeries)
{
throw new Exception();
}
// how many zero's?
var nonzeroCount = numberOfBooksInSeries - basketItems.Count(x => x == 0);
// this will hold all the basket combinations to consider
List <List <int[]> > allBasketCombinations = new List <List <int[]> >();
List <int[]> results = new List <int[]>();
// get the different groups of combinations
for (int i = 1; i <= numberOfBooksInSeries; i++)
{
int[] originalBasketItems = (int[])basketItems.Clone();
results.Clear();
results = _basketHelper.GetCombinations(originalBasketItems, i);
allBasketCombinations.Add(results.Select(x => x).ToList());
// no point looking for (e.g.) combinations of 4 if only 3 in the basket
if (i == nonzeroCount)
{
break;
}
}
return(allBasketCombinations);
}