public int GetModulusSum(AccountDetails bankAccountDetails, ModulusWeightMapping weightMapping)
{
var combinedValue = bankAccountDetails.ToCombinedString();
if (combinedValue.Length != 14)
{
throw new Exception(
string.Format("Combined SortCode and Account Number should be 14 characters long not {0}: {1}",
combinedValue.Length, combinedValue));
}
var sum = 0;
for (var i = 0; i < 14; i++)
{
sum += (int.Parse(combinedValue[i].ToString(CultureInfo.InvariantCulture)) * weightMapping.WeightValues[i]);
}
return(sum);
}
