public void Add(Book book)
{
_books.Add(book);
}
private bool ShouldApplyDiscount(Book book)
{
return (_books.Any(x => x.GetType() != book.GetType()));
}
public void Add(Book book)
{
_books.Add(book);
_total += BOOK_PRICE;
if (ShouldApplyDiscount(book))
{
ApplyDiscount(new PercentageDiscount(5));
}
}
private void AddBook(Book book)
{
if (ContainsBook(book))
{
throw new ArgumentException("This set already contains this book.");
}
Books[book.PositionInSet - 1] = book;
}
private static BookSet ShortestSetWithoutBook(IEnumerable<BookSet> sets, Book book)
{
return sets.OrderBy(s => s.Books.Count(b => b != null))
.FirstOrDefault(s => !s.ContainsBook(book));
}
private static void AddBookToShortestSetThatDoesNotContainIt(IEnumerable<BookSet> sets, Book book)
{
var shortestCandidateSet = ShortestSetWithoutBook(sets, book);
shortestCandidateSet.AddBook(book);
}
private bool ContainsBook(Book book)
{
return Books.Length >= book.PositionInSet
&& Books.ElementAt(book.PositionInSet -1) != null;
}
private BookSet(int setSize)
{
Books = new Book[setSize];
}