public bool Borrow(string isbn, string cnp)
{
var searchedBookIndex = AvailableBooks.FindIndex(item => item.Book.ISBN == isbn);
if (searchedBookIndex != -1 &&
AvailableBooks[searchedBookIndex].Quantity > 0 &&
_dependencyService.Get <IValidationService>().IsValidCNP(cnp))
{
AvailableBooks[searchedBookIndex].Quantity--;
var currentDate = DateTimeOffset.UtcNow;
BorrowedBooks.Add(new Borrowing
{
CNP = cnp,
ISBN = isbn,
BorrowingPrice = AvailableBooks[searchedBookIndex].BorrowPrice,
BorrowingStartDate = currentDate.ToUnixTimeMilliseconds().ToString(),
BorrowingEndDate = currentDate.AddDays(AppConstants.MAX_LOAN_DAYS).ToUnixTimeMilliseconds().ToString()
});
return(true);
}
else
{
return(false);
}
}
public bool AddExistingBook(string isbn, int quantity = 1)
{
var bookIndex = AvailableBooks.FindIndex(item => item.Book.ISBN == isbn);
if ((bookIndex != -1) &&
_dependencyService.Get <IValidationService>().IsValidQuantity(quantity))
{
AvailableBooks[bookIndex].Quantity += quantity;
return(true);
}
return(false);
}
public bool AddNewBook(Book book, double price, int quantity = 1)
{
var validationService = _dependencyService.Get <IValidationService>();
if (validationService.isValidBook(book) &&
validationService.IsValidPrice(price) &&
validationService.IsValidQuantity(quantity))
{
var searchedIndex = AvailableBooks.FindIndex(item => item.Book.ISBN == book.ISBN);
if (searchedIndex == -1)
{
AvailableBooks.Add(new BookProductInfo {
Book = book, BorrowPrice = price, Quantity = quantity
});
return(true);
}
}
return(false);
}