class Cart:
def __init__(self):
self._items = {}
self._catalogue = Catalogue()
self._sub_total = 0.0
self._discount = 0.0
def add_item(self, item: Item, quantity: int):
if quantity <= 0 or quantity > self._catalogue.show_items()[item][1]:
raise ValueError("Not a valid quantity")
self._catalogue.remove_item(item, quantity)
if item in self._items:
self._items[item] += quantity
else:
self._items[item] = quantity
def remove_item(self, item: Item, quantity: int):
if item not in self._items or self._items[item] < quantity:
raise ValueError("Incorrect Quantity")
self._items[item] -= quantity
self._catalogue.add_existing_item(item, quantity)
def show_items(self):
return copy.copy(self._items)
def calculate_discount(self):
discount = Utility.round_up(self._calc_disc(Offers().show_offers(), self.show_items()), 2)
return discount
def _calc_disc(self, offer_list, remaining_items):
if len(offer_list) == 0 or len(remaining_items) == 0:
return 0.0
discount_summary = []
for offer in offer_list:
discount, ri = offer.get_discount_and_remaining_items(remaining_items)
offer_list_copy = copy.copy(offer_list)
if discount == 0.0:
offer_list_copy.remove(offer)
else:
discount_summary.append(discount + self._calc_disc(offer_list_copy, ri))
if not discount_summary:
return 0.0
return max(discount_summary)
def calculate_sub_total(self):
sub_total = 0.0
for item in self._items:
sub_total += Catalogue().show_items()[item][0] * self._items[item]
return Utility.round_up(sub_total, 2)
def calculate_totals(self):
return Utility.round_up(self.calculate_sub_total() - self.calculate_discount(), 2)
def test_there_is_only_one_catalogue(self):
an_item, price, quantity = Item("Item1"), 2.0, 10
catalogue1 = Catalogue()
catalogue1.add_item(an_item, price, quantity)
catalogue2 = Catalogue()
assert an_item in catalogue2.show_items()