def get_price_breakdown(self):
"""
Return a breakdown of line prices after discounts have been applied.
Returns a list of (unit_price_incl_tax, unit_price_excl_tax, quantity)
tuples.
"""
if not self.is_tax_known:
raise RuntimeError("A price breakdown can only be determined "
"when taxes are known")
prices = []
if not self.discount_value:
prices.append((self.unit_price_incl_tax, self.unit_price_excl_tax,
self.quantity))
else:
# Need to split the discount among the affected quantity
# of products.
item_incl_tax_discount = (
self.discount_value / int(self.consumer.consumed()))
item_excl_tax_discount = item_incl_tax_discount * self._tax_ratio
item_excl_tax_discount = round_half_up(item_excl_tax_discount)
prices.append((self.unit_price_incl_tax - item_incl_tax_discount,
self.unit_price_excl_tax - item_excl_tax_discount,
self.consumer.consumed()))
if self.quantity_without_discount:
prices.append((self.unit_price_incl_tax,
self.unit_price_excl_tax,
self.quantity_without_discount))
return prices
def line_price_incl_tax_incl_discounts(self):
# We use whichever discount value is set. If the discount value was
# calculated against the tax-exclusive prices, then the line price
# including tax
if self.line_price_incl_tax is not None and self._discount_incl_tax:
return max(0, self.line_price_incl_tax - self._discount_incl_tax)
elif self.line_price_excl_tax is not None and self._discount_excl_tax:
return max(0, round_half_up((self.line_price_excl_tax - self._discount_excl_tax) / self._tax_ratio))
return self.line_price_incl_tax
def line_price_incl_tax_incl_discounts(self):
# We use whichever discount value is set. If the discount value was
# calculated against the tax-exclusive prices, then the line price
# including tax
if self.line_price_incl_tax is not None and self._discount_incl_tax:
return self.line_price_incl_tax - self._discount_incl_tax
elif self.line_price_excl_tax is not None and self._discount_excl_tax:
return round_half_up(
(self.line_price_excl_tax - self._discount_excl_tax) /
self._tax_ratio)
return self.line_price_incl_tax
def line_price_excl_tax_incl_discounts(self):
if self._discount_excl_tax and self.line_price_excl_tax is not None:
return max(0, self.line_price_excl_tax - self._discount_excl_tax)
if self._discount_incl_tax and self.line_price_incl_tax is not None:
# This is a tricky situation. We know the discount as calculated
# against tax inclusive prices but we need to guess how much of the
# discount applies to tax-exclusive prices. We do this by
# assuming a linear tax and scaling down the original discount.
return max(
0, self.line_price_excl_tax -
round_half_up(self._tax_ratio * self._discount_incl_tax))
return self.line_price_excl_tax
def line_price_excl_tax_incl_discounts(self):
if self._discount_excl_tax and self.line_price_excl_tax is not None:
return max(0, self.line_price_excl_tax - self._discount_excl_tax)
if self._discount_incl_tax and self.line_price_incl_tax is not None:
# This is a tricky situation. We know the discount as calculated
# against tax inclusive prices but we need to guess how much of the
# discount applies to tax-exclusive prices. We do this by
# assuming a linear tax and scaling down the original discount.
return max(0, self.line_price_excl_tax - round_half_up(
self._tax_ratio * self._discount_incl_tax
))
return self.line_price_excl_tax
def line_price_incl_tax_incl_discounts(self):
if self.line_price_incl_tax is not None:
return max(
0,
round_half_up(self.line_price_incl_tax - self.discount_value))
return None