#class=> Library
#Layer of Encapsulation=> Display available books, lend a book, add a book
#class=> Customer
#Layer of abstraction => request a book, return a book

print("\t\t\tBLESSING'S LIBRARY")
print( )




class Library():
    def __init__(self, dict_of_books):
        self.availablebooks = dict_of_books

    def display_available_books(self):
        print( )
        print("Which genre of book do you want read? The genres available are: Fantasy,Romance, Science Fiction, Adventure, Motivational\n")
        self.genre = input().title()
        for genre,books in self.availablebooks.items():
            for book in books:
                if self.genre ==genre:
                    print(book)


    def lend_a_book(self,requestedBook):
        print( )
        for genre, books in self.availablebooks.items():
            for book in books :
                if requestedBook.title() == book:
                    print(f"You have borrowed {requestedBook} ")
                    self.availablebooks[genre][requestedBook]-=1
                    break
                if requestedBook not in books:
                    print(f"Sorry {requestedBook} isn't available. Modifications would be made later")
                    break
                if requestedBook in books and self.availablebooks[genre][requestedBook] ==0:
                    print(f"Sorry {requestedBook} is out of stock.Check up later please")
                    break
                break
            break





    def add_a_book(self, returnedBook):
        for genre in books:
            for books in genre:
                if returnedBook in books:
                    self.availablebooks[genre][returnedBook]+=1
                    print("You have returned the book. Thank You!")



class Customer():

    def request_a_book(self):
        print("Enter the book you want to request: ")
        self.book = input( ).title()
        return self.book

    def return_a_book(self):
        print("Enter the name of the book you are returning : ")
        self.book = input( )
        return self.book





library = Library({
                  "Fantasy":{"Lord Of The Rings": 5,"The Colour Of Magic":12,"A Game Of Thrones":25, "The Fellowship Of The Ring":16, "The Colour Of Magic":3},
                   "Romance":{"Pride And Prejudice":10,"Fifty Shades Of Grey":4,"The Hating Game":6,"Vision White":14,"Gone With The Wind":2,"The Thorn Birds":7},
                   "Science Fiction":{"The Calculating Stars":3,"Semiosis":13,"Space Opera":7,"The Book Of M":11,"The Gone World":13,"Blacfish City":15},
                   "Adventure":{"Into Thin Air":8,"Into The World":12,"Treasure Island":5,"Journey To The Centre Of The Earth":6, "Heart of Darkness":1},
                   "Motivational":{"The Power Of Positive Thinking":3,"Think And Grow Rich":2, "You Are A Badass":17, "You Can Heal Your Life":16}

                  })
customer = Customer()

while True:
    print("Press 1 to display the available books")
    print("Press 2 to request a book")
    print("Press 3 to return a book")
    print("Press 4 to exit")
    print()


    useroption = int(input( ))

    if useroption == 1:
        library.display_available_books()
        print()
    elif useroption ==2:
        request = customer.request_a_book()
        library.lend_a_book(request)
    elif useroption ==3:
        returnedBook = customer.return_a_book()
        library.add_a_book(returnedBook)
    elif useroption ==4:
        quit()