private static bool isEdgeCaseOfType(List <Book> books, EdgeCaseType edgeCaseType)
{
if (edgeCaseType == EdgeCaseType.TotalIsEightWithFiveDistinct)
{
return(books.Count == 8 && books.Distinct().Count() == 5);
}
if (edgeCaseType == EdgeCaseType.TotalIsTwentyThreeWithFiveDistinct)
{
return(books.Count == 23 && books.Distinct().Count() == 5);
}
return(false);
}
private static bool isEdgeCase(List <Book> books, out EdgeCaseType edgeCaseType)
{
if (isEdgeCaseOfType(books, EdgeCaseType.TotalIsEightWithFiveDistinct))
{
edgeCaseType = EdgeCaseType.TotalIsEightWithFiveDistinct;
return(true);
}
if (isEdgeCaseOfType(books, EdgeCaseType.TotalIsTwentyThreeWithFiveDistinct))
{
edgeCaseType = EdgeCaseType.TotalIsTwentyThreeWithFiveDistinct;
return(true);
}
edgeCaseType = default(EdgeCaseType);
return(false);
}
private decimal CalculateEdgeCaseCombinations(List <Book> books, EdgeCaseType edgeCaseType)
{
// My brain hurt trying to create a generic solver
switch (edgeCaseType)
{
case EdgeCaseType.TotalIsEightWithFiveDistinct:
return((4 * Rules.DiscountFor(4) * Rules.UnitCost) * 2);
case EdgeCaseType.TotalIsTwentyThreeWithFiveDistinct:
return(((5 * Rules.DiscountFor(5) * Rules.UnitCost) * 3) + ((4 * Rules.DiscountFor(4) * Rules.UnitCost) * 2));
default:
throw new NotImplementedException("Unknown edge case");
}
}
