internal static string ConvertToRomanSingularNumber(int numberToConvert)
{
if (numberToConvert == 0)
{
return("");
}
CreateInstances();
RomanNumberInstance before = null;
RomanNumberInstance after = null;
foreach (RomanNumberInstance instance in instances)
{
int instanceNumber = instance.GetNumber();
if (numberToConvert == instanceNumber)
{
return("" + instance.GetLetter());
}
if (numberToConvert > instanceNumber)
{
if (before == null || before.GetNumber() < instanceNumber)
{
before = instance;
}
}
if (numberToConvert < instanceNumber)
{
if (after == null || after.GetNumber() > instanceNumber)
{
after = instance;
}
}
}
if (after != null)
{
foreach (RomanNumberInstance instance in instances)
{
if (after.AllowedBefore(instance))
{
if (after.GetNumber() - instance.GetNumber() == numberToConvert)
{
return("" + instance.GetLetter() + after.GetLetter());
}
}
}
}
if (before != null)
{
int amountOfBefores = 2;
while (true)
{
if (before.GetNumber() * amountOfBefores == numberToConvert)
{
string toReturn = "";
for (int i = 0; i < amountOfBefores; i++)
{
toReturn += before.GetLetter();
}
return(toReturn);
}
else if (before.GetNumber() * amountOfBefores > numberToConvert)
{
foreach (RomanNumberInstance instance in instances)
{
if (before.AllowedAfter(instance))
{
int amountOfAfters = 1;
while (true)
{
if (before.GetNumber() + instance.GetNumber() * amountOfAfters == numberToConvert)
{
string toReturn = "" + before.GetLetter();
for (int i = 0; i < amountOfAfters; i++)
{
toReturn += instance.GetLetter();
}
return(toReturn);
}
else if (before.GetNumber() + instance.GetNumber() * amountOfAfters > numberToConvert)
{
throw new NotImplementedException();
}
else
{
amountOfAfters++;
}
}
}
}
}
else
{
amountOfBefores++;
}
}
}
throw new NotImplementedException();
}
