public static string GetBook(int userId, int bookId)
{
int ddays = 0;
User user = context.Users.Find(userId);
Book book = context.Books.Find(bookId);
Issuance issuance = UserForGrid.FindUserIssuance(user, book);
if (issuance == null)
{
ddays = -1;
}
if (new UserForGrid(user).HasDebts())
{
ddays = issuance.GetDebtDays();
}
book.NumOfBooks++;
context.Issuances.Remove(issuance);
user.Issuances.Remove(issuance);
context.SaveChanges();
return($"BookWasReturned|{ddays}");
}
public static string GiveBook(int userId, int bookId, DateTime deadLine)
{
User user = context.Users.Find(userId);
Book book = context.Books.Find(bookId);
Issuance issuance = UserForGrid.FindUserIssuance(user, book);
if (issuance != null || book == null || user == null || book.NumOfBooks == 0)
{
return("CantGiveBook");
}
issuance = new Issuance()
{
Book = book, IssuanceDate = DateTime.Now, Deadline = deadLine
};
book.NumOfBooks--;
user.Issuances.Add(issuance);
context.SaveChanges();
return("BookWasGiven");
}