public IEnumerable <ReturnBookDTO> GetBorrowedBooks()
{
List <ReturnBookDTO> returnBookDTOs = new List <ReturnBookDTO>();
var bookCopies = _BookCopyService.GetBorrowedBooks();
foreach (var bookCopy in bookCopies)
{
var bookInfo = _BookInfoService.BookInfoOf(bookCopy);
var lastTrans = _BookTransactionInfoRepository.GetLastBookTransaction(bookCopy.Id);
//If no borrow transaction was found, then its a possible error.
if (lastTrans != null)
{
var requiredFee = ComputeNecessaryFee(bookCopy, lastTrans);
var user = _LibraryUserService.FindById(lastTrans.LibraryUserId);
var newReturnBookDTO = new ReturnBookDTO();
newReturnBookDTO.LibraryUser = user;
newReturnBookDTO.BookInfo = bookInfo;
newReturnBookDTO.RequiredFee = requiredFee;
newReturnBookDTO.BookCopy = bookCopy;
if (user.LibraryUserType == LibraryUser.UserType.Student)
{
newReturnBookDTO.TransactionInfo = new JustReturnBookTransaction(bookCopy, lastTrans);
}
else if (user.LibraryUserType == LibraryUser.UserType.Instructor || user.LibraryUserType == LibraryUser.UserType.Employee)
{
newReturnBookDTO.TransactionInfo = new ReturnBookIgnorePaymentTransaction(bookCopy, lastTrans);
}
returnBookDTOs.Add(newReturnBookDTO);
}
else
{
Debug.WriteLine("Possible error. A book was borrowed but no transaction info was found.");
}
}
return(returnBookDTOs);
}