private async Task GiveBookToFirstReservation(string bookId, string userId)
{
if (bookId == null)
{
throw new ArgumentException("Invalid parameters: book id cannot be null.");
}
if (userId == null)
{
throw new ArgumentException("Invalid parameters: user id cannot be null.");
}
//remove old history registry
var oldHistoryRegistry = await _context.HistoryRegistries.FirstAsync(hr => hr.BookId == bookId).ConfigureAwait(false);
_context.HistoryRegistries.Remove(oldHistoryRegistry);
await _context.SaveChangesAsync().ConfigureAwait(false);
var historyRegistry = new HistoryRegistry()
{
BookId = bookId,
UserId = userId,
CheckOutDate = DateTime.Now.ToShortDateString(),
ReturnDate = DateTime.Now.AddDays(10)
};
if (historyRegistry == null)
{
throw new ArgumentException("Invalid operation: history registry cannot be null.");
}
_context.HistoryRegistries.Add(historyRegistry);
await _context.SaveChangesAsync().ConfigureAwait(false);
}
public async Task <HistoryRegistry> CheckoutBookAsync(string bookId, string userId)
{
if (bookId == null)
{
throw new ArgumentException("Invalid checkout parameters: book id cannot be null.");
}
if (userId == null)
{
throw new ArgumentException("Invalid checkout parameters: user id cannot be null.");
}
var historyRegistry = new HistoryRegistry()
{
BookId = bookId,
UserId = userId,
CheckOutDate = DateTime.Now.ToShortDateString(),
ReturnDate = DateTime.Now.AddDays(10)
};
if (historyRegistry == null)
{
throw new ArgumentException("Invalid operation: history registry cannot be null.");
}
_context.HistoryRegistries.Add(historyRegistry);
var book = await _context.Books.FirstAsync(x => x.Id == bookId).ConfigureAwait(false);
book.IsCheckedOut = true;
//avlb. copies prop. of this book decr. with 1 in each book
await _context.Books.Where(b => b.Title == book.Title && b.Author.Name == book.Author.Name && b.Language == book.Language).ForEachAsync(bc => bc.Copies--).ConfigureAwait(false);
await _context.SaveChangesAsync().ConfigureAwait(false);
return(historyRegistry);
}
private void ChangeToReturned(HistoryRegistry historyRegistryToChange)
{
historyRegistryToChange.IsReturned = true;
}
