public ActionResult <Loan> PayLoan(PayLoanContract contract)
{
string errorString;
if (_loanValidator.PayLoanIsValid(contract, out errorString))
{
return(BadRequest(new JsonResult(errorString)));
}
var loanItem = _loanRepository.GetLoanById(contract.LoanId);
if (loanItem == null)
{
return(NotFound(new JsonResult("Loan is not found.")));
}
if (loanItem.Quantity - contract.Quantity < 0)
{
return(BadRequest(new JsonResult("Quantity you want to pay is bigger than amount left on the loan.")));
}
loanItem.Quantity -= contract.Quantity;
_loanRepository.UpdateLoan(loanItem);
return(Ok(loanItem));
}
public bool PayLoanIsValid(PayLoanContract contract, out string errorString)
{
errorString = String.Empty;
if (contract.LoanId < 0)
{
errorString += "Loan Id cannot be smaller than 0.";
}
if (contract.Quantity < 0)
{
errorString += "Cannot pay negative quantity.";
}
return(errorString == String.Empty ? false : true);
}