//TODO: Get rid of the exceptions used for logic and add tryparse instead
public static BankAccountSe CreateBankAccount(string accountNumber)
{
var cleaned = AccountNumberValidator.Clean(accountNumber) ?? "";
if (cleaned.Length < 6)
{
throw new ArgumentException("An account number is at least 6 digits");
}
BankAccountSe a4 = null;
ArgumentException a4Exception = null;
try
{
a4 = CreateBankAccount(cleaned.Substring(0, 4), cleaned.Substring(4));
}
catch (ArgumentException ex)
{
a4Exception = ex;
}
BankAccountSe a5 = null;
ArgumentException a5Exception = null;
try
{
//Assuming clearingnumber of length 5
a5 = CreateBankAccount(cleaned.Substring(0, 5), cleaned.Substring(5));
if (a5.Bank != ClearingNumberRange.SwebankName)
{
throw new ArgumentException("5 digits clearing number are only allowed for Swedbank.");
}
}
catch (ArgumentException ex)
{
a5Exception = ex;
}
//This should be impossible. Both length 4 and length 5 seem valid. This is an error
if (a4Exception == null && a5Exception == null)
{
if (a4.Bank == ClearingNumberRange.SwebankName)
{
//Both are valid and we have swedbank. We want a5 in this case
return(a5);
}
else
{
throw new Exception("Bank account '" + accountNumber + "' seems to be valid both with 4 and 5 clearing digits. This is an error in the parsing logic.");
}
}
//This is not a valid account number by either method. We pick one of the exceptions at random (may be improved by checking length or similar)
if (a4Exception != null && a5Exception != null)
{
throw a4Exception;
}
return(a4Exception != null ? a5 : a4);
}
/// <summary>
/// Returns the bank name and account number type from a clearing number. If no bank could be matched to the
/// clearing number, AccountNumberType.Unkown will be returned.
/// </summary>
/// <param name="clearingNumber">The clearing number to match.</param>
/// <returns>A tuple object with bank name and account number type.</returns>
public static Tuple <string, AccountNumberType> GetBankAndAccountNumberType(string clearingNumber)
{
if (!AccountNumberValidator.IsInteger(clearingNumber))
{
throw new ArgumentException("clearingNumber must be numeric.");
}
// Item1: Bank, Item2: AccountNumberType
// Swedbank uses 5 digit clearing numbers. Only the 4 first digits are used, the 5th digit is a check digit
return(GetBankAndAccountNumberType(int.Parse(clearingNumber.Substring(0, 4))));
}
/// <summary>
/// Creates a BankAccount object. Throws an argument exception if the clearing number or account number is malformatted.
/// </summary>
/// <param name="clearingNumber">The clearing number part of the bank account.</param>
/// <param name="accountNumber">The account number part of the bank account.</param>
/// <returns>A BankAccount object.</returns>
public static BankAccountSe CreateBankAccount(string clearingNumber, string accountNumber)
{
if (string.IsNullOrEmpty(clearingNumber))
{
throw new ArgumentException("clearingNumber must not be null or empty string.");
}
if (string.IsNullOrEmpty(accountNumber))
{
throw new ArgumentException("accountNumber must not be null or empty string.");
}
BankAccountSe bankAccount = new BankAccountSe();
// Remove any redundant characters
clearingNumber = AccountNumberValidator.Clean(clearingNumber);
accountNumber = AccountNumberValidator.Clean(accountNumber);
accountNumber = accountNumber.TrimStart('0');
// Assign clearing number
AccountNumberValidator.CheckClearingNumber(clearingNumber);
// Assign account type and bank
var bankAndAccountNumberType = ClearingNumberRange.GetBankAndAccountNumberType(clearingNumber);
if ((bankAccount.AccountNumberType = bankAndAccountNumberType.Item2) == AccountNumberType.Unknown)
{
throw new ArgumentException("Unknown clearingNumber. Could not match clearingNumber to a known bank.");
}
bankAccount.Bank = bankAndAccountNumberType.Item1;
// Assign account number
AccountNumberValidator.CheckAccountNumber(ref clearingNumber, ref accountNumber, bankAndAccountNumberType.Item2, bankAccount.Bank == ClearingNumberRange.SwebankName);
bankAccount.AccountNumber = accountNumber;
bankAccount.ClearingNumber = clearingNumber;
if (bankAccount.AccountNumberType == AccountNumberType.Type5 && bankAccount.Bank == ClearingNumberRange.SwebankName && bankAccount.ClearingNumber.Length == 5)
{
bankAccount.ClearingNumber = bankAccount.ClearingNumber.Substring(0, 4);
}
return(bankAccount);
}
