private static string PrintOnlyNumber(AccountNumber accountNumber)
{
var numberPart = "";
var digits = accountNumber.Digits;
if (digits.Any())
numberPart = string.Join("", digits.Select(PrintSingleDigit()).ToArray());
return numberPart;
}
public static string PrintNumberRepresentation(AccountNumber accountNumber)
{
if (accountNumber == null)
return "";
var number = PrintOnlyNumber(accountNumber);
var suffix = PrintSuffixPart(accountNumber, number);
var result = string.Format("{0} {1}", number, suffix).TrimEnd();
return result;
}
public static int CalculateChecksum(AccountNumber accountNumber)
{
var factor = 1;
var checksum = 0;
foreach (var digit in accountNumber.Digits.Reverse())
{
checksum += factor * digit.Value;
factor++;
}
return checksum;
}
private static string PrintSuffixPart(AccountNumber accountNumber, string result)
{
if (result.Contains(IllegalDigitMark))
return IllegalSuffix;
else
{
var checksum = ChecksumCalculator.CalculateChecksum(accountNumber);
var checksumValid = ChecksumValidator.IsChecksumValid(checksum);
if (!checksumValid)
return ErrorSuffix;
}
return "";
}