public List <AccountNumber> GetAlternativeNumbers()
{
var result = new List <AccountNumber>();
var digits = new List <Digit>();
Number.ForEach(x =>
{
if (!digits.Any(y => y.DigitValue == x.DigitValue))
{
digits.Add(x);
}
});
var numberAsText = this.ToString().Substring(0, 9);
foreach (var digit in digits)
{
var digitOccurrences = numberAsText.Count(x => x.ToString() == digit.DigitValue.ToString());
var alternativeValues = digit.GetAlternativeValues();
foreach (var newValue in alternativeValues)
{
var digitValueIndex = 0;
for (int i = 0; i < digitOccurrences; i++)
{
digitValueIndex = numberAsText.IndexOf(digit.DigitValue.ToString(), digitValueIndex);
var newAccountNumber = new AccountNumber(numberAsText
.Remove(digitValueIndex, 1)
.Insert(digitValueIndex, newValue.ToString()));
if (newAccountNumber.HasValidChecksum() && !result.Any(x => x.Equals(newAccountNumber)))
{
result.Add(newAccountNumber);
}
digitValueIndex++;
}
}
}
return(result.Distinct().ToList());
}
public void Tests(string accountNumber, bool isValid)
{
var account = new AccountNumber(accountNumber);
Assert.AreEqual(isValid, account.HasValidChecksum());
}