public Book Create(Book book)
{
var bookEntity = _context.Add(book);
_context.SaveChanges();
return(bookEntity.Entity);
}
/// <summary>
/// Inserts an author and a book into database
/// </summary>
/// <param name="authorname">The Name of an author of a book</param>
/// <param name="bookname">The boook's name</param>
public void AddAnAuthorAndBook(string authorname, string bookname, string connectionString)
{
using (BookLibContext db = new BookLibContext())
{
var book = db.Books.FirstOrDefault(b => b.BookName == bookname);
var author = db.Authors.FirstOrDefault(a => a.Name == authorname);
if (book == null)
{
if (author == null)
{
Author au = new Author {
Name = authorname
};
Book bo = new Book {
BookName = bookname, Authors = au
};
db.Authors.Add(au);
db.Books.Add(bo);
db.SaveChanges();
}
else
{
Book bo = new Book {
BookName = bookname, Authors = author
};
db.Books.Add(bo);
db.SaveChanges();
}
}
else
{
throw new DuplicateNameException("There is such book in database");
}
}
}
/// <summary>
/// Updates the reading progress of a book
/// </summary>
/// <param name="finishpage">The page on which you have ended</param>
/// <param name="bookname">The name of the book you are reading</param>
public void UpdateProgress(string finishpage, string bookname, string connectionString)
{
using (BookLibContext db = new BookLibContext())
{
var progress = db.ReadingProgresses.FirstOrDefault(rp => rp.Books.BookName == bookname);
if (progress == null)
{
throw new Exception("There is no such book in database");
}
else
{
int result;
if (int.TryParse(finishpage, out result) | finishpage == "Finished")
{
progress.FinishPage = finishpage;
db.ReadingProgresses.Update(progress);
db.SaveChanges();
}
else
{
throw new Exception("Enter the number, please");
}
}
}
}
/// <summary>
/// Deletes an author from a database with all theirs book
/// </summary>
/// <param name="authorname">The name of an author to delete</param>
public void DeleteAnAuthor(string authorname, string connectionString)
{
using (BookLibContext db = new BookLibContext())
{
var author = db.Authors.FirstOrDefault(a => a.Name == authorname);
if (author == null)
{
throw new Exception("There is no such author in database");
}
else
{
db.Authors.Remove(author);
db.SaveChanges();
}
}
}
/// <summary>
/// Deletes a book from a database
/// </summary>
/// <param name="bookname">The name of a book to delete</param>
public void DeleteABook(string bookname, string connectionString)
{
using (BookLibContext db = new BookLibContext())
{
var book = db.Books.FirstOrDefault(b => b.BookName == bookname);
if (book == null)
{
throw new Exception("There is no such book in database");
}
else
{
db.Books.Remove(book);
db.SaveChanges();
}
}
}
/// <summary>
/// Updates the name of a book
/// </summary>
/// <param name="bookname">The name of book which you want to change></param>
/// <param name="newbookname">The new name of a book</param>
public void UpdateBookName(string bookname, string newbookname, string connectionString)
{
using (BookLibContext db = new BookLibContext())
{
var book = db.Books.FirstOrDefault(a => a.BookName == bookname);
if (book == null)
{
throw new Exception("There is no such book in database");
}
else
{
book.BookName = newbookname;
db.Books.Update(book);
db.SaveChanges();
}
}
}
public void Create(Library library)
{
_bookLibContext.Libraries.Add(library);
_bookLibContext.SaveChanges();
}
public User Register(User user)
{
_context.Users.Add(user);
_context.SaveChanges();
return(GetUser(user.Login));
}
public string ChangeBookingStatus(int bookId, int userId, BookingStatus bookingStatus)
{
if (BookingStatus.Booked == bookingStatus)
{
if (_context.Queues.Any(x => x.BookingStatus == BookingStatus.Expired && x.UserId == userId))
{
return("У вас есть просроченные сдачи, вы не можете брать новые книги");
}
if (_context.Queues.Any(x => x.BookingStatus == BookingStatus.Waiting && x.BookId == bookId))
{
var targetDate = _context
.Queues
.Where(x => x.BookingStatus == BookingStatus.Waiting && x.BookId == bookId)
.OrderByDescending(x => x.Deadline)
.First()
.Deadline
.AddDays(7);
_context.Queues.Add(new Queue()
{
Deadline = targetDate, BookId = bookId, UserId = userId, BookingStatus = BookingStatus.Waiting
});
_context.SaveChanges();
return("Вы успешно заняли место в очереди");
}
if (_context.Queues.Any(x => x.BookingStatus == BookingStatus.Expired && x.BookId == bookId))
{
var targetDate = DateTime.Today.AddDays(7);
_context.Queues.Add(new Queue()
{
Deadline = targetDate, BookId = bookId, UserId = userId, BookingStatus = BookingStatus.Waiting
});
_context.SaveChanges();
return("Вы успешно заняли место в очереди");
}
if (_context.Queues.Any(x => x.BookingStatus == BookingStatus.Booked && x.BookId == bookId))
{
var targetDate = _context.Queues.FirstOrDefault(x => x.BookingStatus == BookingStatus.Booked && x.BookId == bookId).Deadline;
_context.Queues.Add(new Queue()
{
Deadline = targetDate.AddDays(7), BookId = bookId, UserId = userId, BookingStatus = BookingStatus.Waiting
});
_context.SaveChanges();
return("Вы успешно заняли место в очереди");
}
_context.Queues.Add(new Queue()
{
BookId = bookId,
BookingStatus = BookingStatus.Booked,
Deadline = DateTime.Today.AddDays(7),
UserId = userId
});
_context.SaveChanges();
return($"Вы взяли книгу до {DateTime.Today.AddDays(7).ToShortDateString()}");
}
if (BookingStatus.Returned == bookingStatus)
{
var msg = "Вы вернули книгу";
var bookQueue = _context.Queues.Where(x => x.BookId == bookId)
.OrderBy(x => x.Deadline)
.ToList();
//находим текущего владельца (статус "На руках" или "Просрочено")
var current = bookQueue.FirstOrDefault(x => new[] { BookingStatus.Booked, BookingStatus.Expired }.Contains(x.BookingStatus));
//меняем статус на "Вернул"
var prevDeadLine = current.Deadline;
if (current.Deadline != DateTime.Today && current.BookingStatus == BookingStatus.Booked)
{
current.Deadline = DateTime.Today;
}
current.BookingStatus = BookingStatus.Returned;
_context.Queues.Update(current);
_context.SaveChanges();
//если текущая дата дедлайна не равна сегодня, нужно причесать другие дедлайны
if (prevDeadLine != DateTime.Today)
{
//обновляем дедлайны
UpdateWaiters(bookId);
}
//ищем ожидающих на очереди
var waitList = bookQueue
.Where(x => x.BookingStatus == BookingStatus.Waiting).ToList();
if (!waitList.Any())
{
return(msg);
}
//если таковые есть, то дергаем того, у кого дедлайн ближайший
var minDeadline = waitList.Min(x => x.Deadline);
var waiter = waitList.FirstOrDefault(x => x.Deadline == minDeadline);
//меняем статус ожидающего на "Забронено"
waiter.BookingStatus = BookingStatus.Booked;
_context.Queues.Update(waiter);
_context.SaveChanges();
return(msg);
}
return(string.Empty);
}
