def borrowBook(self, cloudDB, userName, bookID = -1):
if bookID == -1:
print('Please enter the ISBN number of the book you want to borrow:')
bookID = TakeInput.inputInteger(1,cloudDB.getBookQuantity())
availabale = cloudDB.checkBookStatus(bookID)
if availabale == False:
print("Sorry, this book is current not availabale, please borrow another one..")
else:
borrowDate = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
returnDate = (datetime.now() + timedelta(days = 7)).strftime("%Y-%m-%d %H:%M:%S")
userID = cloudDB.getUserID(userName)
bookName = cloudDB.getBookName(bookID)
eid = EventManager.insert(bookName,userName)
print("")
print('Book borrow detail')
print("Borrow Date: "+borrowDate)
print("Return Date: "+returnDate)
print("Book detail:")
cloudDB.printABookDetail(bookID)
cloudDB.insertBookBorrowed(userID,bookID,borrowDate,eid)
print("")
print('Book Borrowed Successfull! Please return it within 7 days!')
print("")
return
