public BookErrorCodes AddNewBook(string title, string author, double cost, long ISBN, int shelfID)
{
var existingShelf = shelfManager.GetShelf(shelfID);
if (existingShelf == null)
{
return(BookErrorCodes.NoSuchShelf);
}
if (ValidateISBN(ISBN) == false)
{
return(BookErrorCodes.IncorrectISBN);
}
var sameBooks = bookManager.GetListOfBooksByTitle(title);
if (sameBooks.Count > 0)
{
bookManager.AddBook(title, author, cost, ISBN, sameBooks.First().ShelfID);
return(BookErrorCodes.OkButBookIsPutInAnotherShelfWithExistingBooks);
}
else
{
bookManager.AddBook(title, author, cost, ISBN, shelfID);
}
return(BookErrorCodes.ok);
}
public ShelfErrorCodes RemoveShelf(int shelfID)
{
var shelf = shelfManager.GetShelf(shelfID);
if (shelf == null)
{
return(ShelfErrorCodes.NoSuchShelf);
}
else
{
if (shelf.Books != null)
{
return(ShelfErrorCodes.TheShelfContainsBooks);
}
else
{
shelfManager.RemoveShelf(shelf);
}
return(ShelfErrorCodes.ok);
}
}