// Edit a Borrower
// Ability to borrow a book if available
public void BorrowBook(BorrowerBooksAccount BorrowerBooksAccount, bool isBorrowing)
{
try
{
// Get the list of books
var books = _redisCacheProvider.GetAll <Book>();
var borrowers = _redisCacheProvider.GetAll <Borrower>();
ValidateBorrowBook(BorrowerBooksAccount, books, borrowers, isBorrowing);
// create a borrowerBookAccount for new Account to be created
var bbaToCreate = BorrowerBooksAccount.Map();
if (isBorrowing)
{
bbaToCreate.Id = _redisCacheProvider.GetNextSequenceForBorrowerBookAccount();
}
_redisCacheProvider.SaveBorrowerBooksAccount(bbaToCreate);
// Update the Book
var book = books.FirstOrDefault(x => x.Id == bbaToCreate.BookId);
if (book == null)
{
throw new Exception("Cannot find the book");
}
book.IsAvailable = false;
_redisCacheProvider.SaveBook(book);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
private void ValidateBorrowBook(BorrowerBooksAccount borrowerBooksAccount, IEnumerable <Book> books, IEnumerable <Borrower> borrowers, bool isBorrowing)
{
// Check whether the book exist in the books list, if not throw error Message
var book = books.FirstOrDefault(x => x.Id == borrowerBooksAccount.BookId);
if (book == null)
{
throw new Exception("Cannot find the Book");
}
// Check whether the book is available to borrow
if (!book.IsAvailable)
{
throw new Exception("Book is not available for borrowing");
}
// Check whether the borrower is there in the list, if not throw error Message
var borrower = borrowers.FirstOrDefault(x => x.Id == borrowerBooksAccount.BorrowerId);
if (borrower == null)
{
throw new Exception("Cannot find the Borrower");
}
if (isBorrowing)
{
if (borrowerBooksAccount.DateBorrowed < DateTime.Today)
{
throw new Exception("Cannot set date borrowed in the past");
}
}
}
public BorrowerBooksAccount SaveBorrowerBooksAccount(BorrowerBooksAccount borrowerBooksAccount)
{
BorrowerBooksAccount result;
using (RedisClient client = new RedisClient())
{
var wrapper = client.As <BorrowerBooksAccount>();
result = wrapper.Store(borrowerBooksAccount);
}
return(result);
}
public static BorrowerBooksAccount Map(this BorrowerBooksAccount borrowerBooksAccount)
{
if (borrowerBooksAccount == null)
{
return(null);
}
return(new BorrowerBooksAccount
{
BookId = borrowerBooksAccount.BookId,
BorrowerId = borrowerBooksAccount.BorrowerId,
DateBorrowed = borrowerBooksAccount.DateBorrowed,
DateReturned = borrowerBooksAccount.DateReturned
});
}
public void PostBorrowBook([FromBody] BorrowerBooksAccount bba)
{
try
{
var bookBorrower = new BorrowerBooksAccount
{
Id = 0,
BookId = bba.BookId,
BorrowerId = bba.BorrowerId,
DateBorrowed = DateTime.Now,
DateReturned = null
};
_libraryService.BorrowBook(bookBorrower, true);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
