// TODO handle cases when it fails to insert data into db
public async Task <RentAttemptModel> RentBooks(string ssn, IEnumerable <string> isbns)
{
if (!MemberUtils.ValidateSsn(ssn))
{
throw new ArgumentException("Invalid isbn");
}
if (isbns == null || !isbns.Any())
{
throw new ArgumentException("Isbn list cannot be empty when renting books");
}
var member = await _memberRepository.FindBySsn(ssn);
var role = await _memberRepository.GetRoleName(member);
if (!Roles.CanRent(role))
{
return(RentAttemptModel.WhenUserIsInWrongRole());
}
var order = new Order()
{
MemberId = ssn,
Created = DateTime.UtcNow
};
var orderId = await _orderRepository.InsertAsyncWithIdReturn(order);
foreach (var isbn in isbns)
{
var book = await _bookRepository.GetByIsbnAsync(isbn);
if (!book.Loanable)
{
return(RentAttemptModel.WhenOneOfTheBooksIsNotLoanable());
}
var availableCopies = (await _bookCopyRepository.GetByIsbnAsync(isbn))
.Where(x => x.Available).ToList();
if (availableCopies.Count == 0)
{
return(RentAttemptModel.WhenOneOfTheBooksDoesntHaveCopiesAvailable());
}
var chosenCopy = availableCopies[0];
chosenCopy.Available = false;
var orderLine = BookRentUtils.CreateOrderLineModel(orderId, chosenCopy.Id);
await _orderLineRepository.InsertAsync(orderLine);
await _bookCopyRepository.UpdateAsync(chosenCopy);
}
return(RentAttemptModel.WhenSuccesful());
}