def apply(self,
basket,
condition,
offer,
discount_amount=None,
max_total_discount=None):
if discount_amount is None:
discount_amount = self.value
# Fetch basket lines that are in the range and available to be used in
# an offer.
line_tuples = self.get_applicable_lines(offer, basket)
# Determine which lines can have the discount applied to them
max_affected_items = self._effective_max_affected_items()
num_affected_items = 0
affected_items_total = D('0.00')
lines_to_discount = []
for price, line in line_tuples:
if num_affected_items >= max_affected_items:
break
qty = min(line.quantity_without_discount,
max_affected_items - num_affected_items)
lines_to_discount.append((line, price, qty))
num_affected_items += qty
affected_items_total += qty * price
# Ensure we don't try to apply a discount larger than the total of the
# matching items.
discount = min(discount_amount, affected_items_total)
if max_total_discount is not None:
discount = min(discount, max_total_discount)
if discount == 0:
return results.ZERO_DISCOUNT
# Apply discount equally amongst them
affected_lines = []
applied_discount = D('0.00')
for i, (line, price, qty) in enumerate(lines_to_discount):
if i == len(lines_to_discount) - 1:
# If last line, then take the delta as the discount to ensure
# the total discount is correct and doesn't mismatch due to
# rounding.
line_discount = discount - applied_discount
else:
# Calculate a weighted discount for the line
line_discount = self.round(
((price * qty) / affected_items_total) * discount)
apply_discount(line, line_discount, qty)
affected_lines.append((line, line_discount, qty))
applied_discount += line_discount
condition.consume_items(offer, basket, affected_lines)
return results.BasketDiscount(discount)
def apply(self, basket, condition, offer):
line_tuples = self.get_applicable_lines(offer, basket)
if not line_tuples:
return results.ZERO_DISCOUNT
# Cheapest line gives free product
discount, line = line_tuples[0]
apply_discount(line, discount, 1)
affected_lines = [(line, discount, 1)]
condition.consume_items(offer, basket, affected_lines)
return results.BasketDiscount(discount)
def apply(self, basket, condition, offer): # noqa (too complex (10))
if isinstance(condition, conditions.ValueCondition):
return results.ZERO_DISCOUNT
# Fetch basket lines that are in the range and available to be used in
# an offer.
line_tuples = self.get_applicable_lines(offer,
basket,
range=condition.range)
if not line_tuples:
return results.ZERO_DISCOUNT
# Determine the lines to consume
num_permitted = int(condition.value)
num_affected = 0
value_affected = D('0.00')
covered_lines = []
for price, line in line_tuples:
if isinstance(condition, conditions.CoverageCondition):
quantity_affected = 1
else:
quantity_affected = min(
line.quantity_without_offer_discount(offer),
num_permitted - num_affected)
num_affected += quantity_affected
value_affected += quantity_affected * price
covered_lines.append((price, line, quantity_affected))
if num_affected >= num_permitted:
break
discount = max(value_affected - self.value, D('0.00'))
if not discount:
return results.ZERO_DISCOUNT
# Apply discount to the affected lines
discount_applied = D('0.00')
last_line = covered_lines[-1][1]
for price, line, quantity in covered_lines:
if line == last_line:
# If last line, we just take the difference to ensure that
# rounding doesn't lead to an off-by-one error
line_discount = discount - discount_applied
else:
line_discount = self.round(discount * (price * quantity) /
value_affected)
apply_discount(line, line_discount, quantity, offer)
discount_applied += line_discount
return results.BasketDiscount(discount)
def apply(self,
basket,
condition,
offer,
discount_percent=None,
max_total_discount=None):
if discount_percent is None:
discount_percent = self.value
discount_amount_available = max_total_discount
line_tuples = self.get_applicable_lines(offer, basket)
discount_percent = min(discount_percent, D('100.0'))
discount = D('0.00')
affected_items = 0
max_affected_items = self._effective_max_affected_items()
affected_lines = []
for price, line in line_tuples:
if affected_items >= max_affected_items:
break
if discount_amount_available == 0:
break
quantity_affected = min(
line.quantity_without_offer_discount(offer),
max_affected_items - affected_items)
line_discount = self.round(discount_percent / D('100.0') * price *
int(quantity_affected))
if discount_amount_available is not None:
line_discount = min(line_discount, discount_amount_available)
discount_amount_available -= line_discount
apply_discount(line, line_discount, quantity_affected, offer)
affected_lines.append((line, line_discount, quantity_affected))
affected_items += quantity_affected
discount += line_discount
if discount > 0:
condition.consume_items(offer, basket, affected_lines)
return results.BasketDiscount(discount)
