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module Workarea
module Pricing
class Discount
# This class does the calculation of how much each item should
# receive off for a {QuantityFixedPrice}.
#
# It acts like a hash, where the key is the item id and the value
# is the amount that item should receive off.
#
class QuantityFixedPrice::ItemShares
delegate :[], :each, to: :hash
delegate :price, :quantity, :product_ids, :category_ids, to: :@discount
def initialize(discount, order, applications)
@discount = discount
@order = order
@applications = applications
end
private
def hash
@hash ||=
begin
results = Hash.new(0.to_m)
@applications.times do |i|
current_units = qualified_units.slice!(0, quantity)
total_price = current_units.sum { |u| u[:price] }
total_value = total_price - price
distribution = PriceDistributor.new(total_value, current_units)
distribution.each do |id, value|
results[id] += value
end
end
results
end
end
def qualified_units
@qualified_units ||=
begin
result = []
@order.items.each do |item|
next unless item.matches_products?(product_ids) ||
item.matches_categories?(category_ids)
item.quantity.times do
result << { id: item.id, price: item.current_unit_price }
end
end
result.sort! { |a, b| b[:price] <=> a[:price] }
result.pop until result.length % quantity == 0
result
end
end
end
end
end
end
Version data entries
62 entries across 62 versions & 1 rubygems