public bool IsValid(string input)
{
if (String.IsNullOrEmpty(input))
{
// throw new ArgumentNullException("Checked string could not be empty");
// TODO: write to log: "Checked string could not be empty"
return(false);
}
string trimmedInput = input.Trim().ToUpper();
if (trimmedInput.Length != digitsNumber)
{
// throw new ArgumentException($"Incorrect lenghts of input :'{trimmedInput}'");
// TODO: write to log: $"Incorrect lenghts of input :'{trimmedInput}'"
return(false);
}
if (!Char.IsDigit(trimmedInput[trimmedInput.Length - 1]))
{
// throw new ArgumentException($"Last element in input should be Digit :'{trimmedInput}'");
// TODO: write to log: $"Last element in input should be Digit :'{trimmedInput}'"
return(false);
}
double summ = CalculateSumm(trimmedInput);
int devideResult = (int)summ / digitsNumber;
int multiplyResult = devideResult * digitsNumber;
return(summ - multiplyResult == numberDecoder.Decode(trimmedInput[trimmedInput.Length - 1]));
}
private double CalculateSumm(string trimmedInput)
{
double summ = 0;
for (int i = 0; i < trimmedInput.Length - 1; i++)
{
char symbol = trimmedInput[i];
if (Char.IsLetterOrDigit(symbol))
{
summ += (Char.IsDigit(symbol)
? numberDecoder.Decode(symbol)
: alphasymbolDecoder.Decode(symbol)) * (Math.Pow(2, i));
}
else
{
// throw new ArgumentException($"Used Incorrect symbol '{trimmedInput[i]}' at position: {i} in input '{trimmedInput}'");
// TODO: write to log: $"Used Incorrect symbol '{trimmedInput[i]}' at position: {i} in input '{trimmedInput}'"
}
}
return(summ);
}