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# BIN = primele 6 cifre (st la dreapta)
# Bank Identification Number

# MII = Major industry identifier
# prima cifra

# 1 and 2 are issued by airlines
# 3 is issued by travel and entertainment
# 4 and 5 are issued by banking and financial institutions
# 6 is issued by merchandising and banking
# 7 is issued by petroleum companies
# 8 is issued by telecommunications companies
# 9 is issued by national assignment

# The first six digits are the Issuer Identification Number (IIN).
# These can be used to look up where the card originated from.
# Visa: 4*****
# American Express (AMEX): 34**** or 37****
# Mastercard: 51**** to 55****

# Account Identifier (9 cifre)
# 7 - 15
# Most companies use just 9 digits for the account numbers, but it’s possible to use up to 12

# checksum
# ultima cifra
# The very last digit of a credit card is the check digit or checksum. 
# It is used to validate the credit card number using the Luhn algorithm

# END OF BRIEF ###########

# exercitiu:
# in our banking system, the IIN must be 400000
# In our banking system, the customer account number can be any, 
# but it should be unique. 
# And the whole card number should be 16-digit length

# You should allow customers to create a new account in our banking system.
# Once the program starts, you should print the menu:
# 1. Create an account
# 2. Log into account
# 0. Exit



# If the customer chooses ‘Create an account’, you should generate a new card number 
# which satisfies all the conditions described above. 
# Then you should generate a PIN code that belongs to the generated card number. 
# A PIN code is a sequence of any 4 digits. PIN should be generated in a range from 0000 to 9999.

#If the customer chooses ‘Log into account’, 
# you should ask them to enter their card information. 
# Your program should store all generated data until it is terminated 
# so that a user is able to log into any of the created accounts 
# by a card number and its pin. 
# You can use an array to store the information.

# After all information is entered correctly, 
# you should allow the user to check the account balance; 
# right after creating the account, the balance should be 0. 
# It should also be possible to log out of the account and exit the program.




from random import randint

print("1. Create an account")
print("2. Log into account")
print("0. Exit")


user_input = int(input())


while user_input != 0:

    if user_input == 1:

        class Card():
            def __init__(self, card_increment = 1):
                self.card_increment = card_increment

            def random_with_N_digits(self, n):
                range_start = 10**(n-1)
                range_end = (10**n)-1
                return randint(range_start, range_end)


            def generate_new_card_nr(self):
                customer_account_number = self.random_with_N_digits(9)

                IIN = 400000
                checksum = self.random_with_N_digits(1)

                card =  str(IIN) + str(customer_account_number) + str(checksum)
                print("")
                print("Your card has been created")
                print("Your card number:")
                print(card)
                return card

            def generate_pin(self):
                pin = self.random_with_N_digits(4)
                print("Your card PIN:")
                print(pin)
                return pin

        client1 = Card()
        client1.generate_new_card_nr()
        client1.generate_pin()
       

        print("")
        print("1. Create an account")
        print("2. Log into account")
        print("0. Exit")

        user_input = int(input())

    elif user_input == 2:
        print("")
        print("Enter your card number:")
        login_card_number = int(input())
        print("Enter your PIN:")
        login_pin = int(input())

    else:
        print("bad input")
        break