# Copyright 2013, Michael H. Goldwasser
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

class CreditCard:
  """A consumer credit card."""
  
  def __init__(self, customer, bank, acnt, limit):
    """Create a new credit card instance.

    The initial balance is zero.

    customer  the name of the customer (e.g., 'John Bowman')
    bank      the name of the bank (e.g., 'California Savings')
    acnt      the acount identifier (e.g., '5391 0375 9387 5309')
    limit     credit limit (measured in dollars)
    """
    self._customer = customer
    self._bank = bank
    self._account = acnt
    self._limit = limit
    self._balance = 0

  def get_customer(self):
    """Return name of the customer."""
    return self._customer
    
  def get_bank(self):
    """Return the bank's name."""
    return self._bank

  def get_account(self):
    """Return the card identifying number (typically stored as a string)."""
    return self._account

  def get_limit(self):
    """Return current credit limit."""
    return self._limit

  def get_balance(self):
    """Return current balance."""
    return self._balance

  def charge(self, price):
    """Charge given price to the card, assuming sufficient credit limit.

    Return True if charge was processed; False if charge was denied.
    """
    if price + self._balance > self._limit:  # if charge would exceed limit,
      return False                           # cannot accept charge
    else:
      self._balance += price
      return True

  def make_payment(self, amount):
    """Process customer payment that reduces balance."""
    self._balance -= amount