public void ReturnBook(BookId bookId, BookAmount amount)
{
var book = Books.First(a => a.BookId == bookId);
if (book.BookAmount == amount)
{
Books.RemoveAll(a => a.BookId == bookId);
}
else if (book.BookAmount > amount)
{
Books.RemoveAll(a => a.BookId == bookId);
Books.Add(new BookRecord(book.BookId, book.BookAmount - amount, book.Title));
}
else
{
throw new ArgumentException($"Cannot return book with title {book.Title.Value}. Amount to return is higher than {book.BookAmount.Amount}");
}
AddEvent(new BookRemovedFromLibraryRecord(bookId, amount.Amount, (LibraryRecordId)Id));
if (ReturnDate < DateTime.UtcNow)
{
var oldFineValue = ReturnFine.Value;
var daysBetweenTodayAndReturnDate = ((DateTime.UtcNow - ReturnDate)).Days;
var newFineValue = daysBetweenTodayAndReturnDate * 10;
ReturnFine = new ReturnFine(oldFineValue + newFineValue);
}
if (ReturnFine.Value == 0)
{
IsClosed = true;
}
}
private LibraryRecord(LibraryRecordId id, UserRecord user, List <BookRecord> books)
{
Id = id;
if (user.IsNotBanned)
{
User = user;
}
else
{
throw new InvalidEntityStateException();
}
this.CreatedDate = DateTime.UtcNow;
this.ReturnFine = new ReturnFine(0);
Books = books;
foreach (var book in books)
{
AddEvent(new BookAddedToLibraryRecord(book.BookId, id, book.BookAmount.Amount));
}
}