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Contents
module Workarea
module Pricing
class Discount
# This class is responsible for apply the discount
# results to a particular {Order::Item}.
#
class BuySomeGetSome::ItemApplication
attr_reader :apply_quantity
def initialize(discount, item, apply_quantity)
@discount = discount
@item = item
@apply_quantity = apply_quantity
end
# The item total before this discount is applied.
#
# @return [Money]
#
def current_total
@item.price_adjustments.adjusting('item').sum
end
# The portion of the total quantity that should be charged
# a standard price without discount applied.
#
# @return [Integer]
#
def standard_quantity
@item.quantity - @apply_quantity
end
# The total price of the number of units that get charged
# the pre-buy-some-get-some-discount price.
#
# @return [Money]
#
def standard_units_total
@item.current_unit_price * standard_quantity
end
# The total price of the portion of units that get the
# discount applied.
#
# @return [Money]
#
def discounted_units_total
@item.current_unit_price * @apply_quantity * @discount.percent
end
# The total value of this discount on this item,
# calculated as the total pre-discount and the total
# of standard units and the discounted units.
#
# @return [Money]
#
def value
@value ||= current_total -
standard_units_total -
discounted_units_total
end
end
end
end
end
Version data entries
62 entries across 62 versions & 1 rubygems