import random

class CardAnatomy:

    def __init__(self):
        self.date_base = {}
        self.user_balance = 0

    def main(self):
        command = int(input("1. Create an account\n2. Log into account\n0. Exit\n>"))
        print(" ")
        self.check_command(command)

    def check_command(self, command):
        if command == 1:
            return self.create()
        elif command == 2:
            return self.login()
        elif command == 0:
            return self.exit()

    def create(self):
        random.seed(0)
        user_card = (4000000000000000 + int('{:10d}'.format(random.randrange(0000000000, 9999999999))))
        user_pin_card = '{:04d}'.format(random.randrange(0000, 9999))
        if user_card not in self.date_base:
            self.date_base[user_card] = user_pin_card
            print(f"Your card has been created\nYour card number:\n{user_card}\nEnter your PIN:\n{user_pin_card}")
            print(" ")
            self.main()
        else:
            self.main()

    def login(self):
        check_card_number = int(input("Enter your card number:\n>"))
        pin_code_check = input("Enter your PIN:\n>")
        if self.date_base[check_card_number] == pin_code_check:
            print(" ")
            print("You have successfully logged in!")
            print(" ")
            self.card_actions()
        elif self.date_base[check_card_number] == pin_code_check:
            self.main()
        else:
            print("Bye!")


    def card_actions(self):
        select_after_authorization = int(input("1. Balance\n2. Log out\n0. Exit\n>"))
        if select_after_authorization == 1:
            print(self.user_balance)
            self.card_actions()
        elif select_after_authorization == 2:
            self.main()
        elif select_after_authorization == 0:
            print("Bye!")



ron = CardAnatomy()
print(ron.main())