class Customer:
    """ Customer attributes are firstname, lastname, pin, balance, id"""
    
    def __init__(self, firstname, lastname, id):
        self.firstname = firstname
        self.lastname = lastname
        self.id = id
        self._pin = '1234'
        self._balance = 0.0
        

    def __str__(self):
        return self.firstname + ' '  + self.lastname + ': ' + str(self._balance)
    
    def deposit(self, amount):
        """ Deposits money into the customers account """
        
        self._balance += amount
        
    def validPin(self, pin):
        """ Check and see if the pin supplied is correct. Returns True or False"""
        if pin == self._pin:
            return True
        else:
            return False
        
    def withdraw(self, amount, pin):
        """ User must supply the correct the correct pin. Then user must have sufficient funds. if not, return 0"""
        
        if self.validPin(pin):
            #check if there is enough money
            if amount <= self._balance:
                self._balance -= amount
                return amount
            else:
                print('Insufficient funds')
                return 0
        else:
            print('Invalid Pin')
            return 0
        
    def setPin(self,oldpin,newpin):
        """ Checks to see if the old pin is valid. If so, then set the pin equal to the new pin"""
        pass
    

import copy

class Bank:
    """ Bank has customers, which we store as dictionary, name, cash, debt"""
    
    def __init__ (self, name):
        self.name = name
        self.customers = dict()
        self.cash = 0.0
        self.debt = 0.0
        
        
    def __str__(self):
        return self.name
    
    def addCustomer(self, customer):
        self.customers[customer.id] = customer
        
    def deposit(self, id, amount):
        cust = copy.copy( self.customers[id] )
        cust.deposit(amount)
        self.customers[id] = copy.copy(cust)
 
def Simulation():
    #Creates the bank
    bank = Bank('cs101')
    
    #create a customer
    c1 = Customer('Jason','Grant',1)
    bank.addCustomer(c1)
    bank.deposit(1,50)