def test_to_and_from_json_inverse(loaded_machine):
"""
Test case to ensure the machine is json serializable
and will load to its previous state if reloaded
immediately.
"""
dumped = loaded_machine.to_json()
loaded = VendingMachine.from_json(dumped)
assert loaded == loaded_machine
def view_purchases():
"""
Views all purchases. If no machine exists, error is thrown.
"""
if not os.path.isfile(STATE_FILE_LOCATION):
fancy_print(LOG_ERROR, "Please initialize the vending machine first.")
return None
with open(STATE_FILE_LOCATION) as file:
loaded = json.load(file)
machine = VendingMachine.from_json(loaded)
machine.view_purchases()
return None
def view_balance():
"""
Views the current balance you have in the machine. If no machine exists, error is thrown.
"""
if not os.path.isfile(STATE_FILE_LOCATION):
fancy_print(LOG_ERROR, "Please initialize the vending machine first.")
return None
with open(STATE_FILE_LOCATION) as file:
loaded = json.load(file)
machine = VendingMachine.from_json(loaded)
fancy_print(LOG_SUCCESS, f"Your current balance is {machine.balance}.")
return None
def view_items(column: str = None, row: int = None, position: str = None):
"""
Viewing what items are in the machine. Filters are additive.
"""
if not os.path.isfile(STATE_FILE_LOCATION):
fancy_print(LOG_ERROR, "Please initialize the vending machine first.")
return None
with open(STATE_FILE_LOCATION) as file:
loaded = json.load(file)
machine = VendingMachine.from_json(loaded)
if position:
machine.view_items(position[0], position[1])
else:
machine.view_items(column, row)
return None
def dispense_change():
"""
Removing the money from the existing vending machine. If no machine exists, error is thrown.
"""
if not os.path.isfile(STATE_FILE_LOCATION):
fancy_print(LOG_ERROR, "Please initialize the vending machine first.")
return None
with open(STATE_FILE_LOCATION) as file:
loaded = json.load(file)
machine = VendingMachine.from_json(loaded)
machine.dispense_change()
with open(STATE_FILE_LOCATION, "w") as file:
json.dump(machine.to_json(), file)
return None
def add_money(amount: float):
"""
Adding money to the existing vending machine. If no machine exists, error is thrown.
"""
if not os.path.isfile(STATE_FILE_LOCATION):
fancy_print(LOG_ERROR, "Please initialize the vending machine first.")
return None
with open(STATE_FILE_LOCATION) as file:
loaded = json.load(file)
machine = VendingMachine.from_json(loaded)
machine.deposit(Decimal(amount))
with open(STATE_FILE_LOCATION, "w") as file:
json.dump(machine.to_json(), file)
return None