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Contents
module Returnly
class DiscountCalculator
attr_accessor :order
DISCOUNTER_CLASSES = {
'Spree::Order' => Returnly::Discounts::Order,
'Spree::LineItem' => Returnly::Discounts::LineItem
}.freeze
def initialize(order)
@order = order
end
def calculate(line_items = [])
line_items.inject(0) do |discount_amount, item|
line_item = find_line_item(item[:order_line_item_id])
next discount_amount if line_item.nil?
discount_amount += discount_amount_for(line_item, item[:units].to_i)
discount_amount
end
end
private
def discount_amount_for(line_item, units)
discounters.inject(0) do |amount, discounter|
amount += discounter.discount_amount(line_item, units)
amount
end
end
def discounters
order_promotion_adjustments.map { |promotion_adjustment| build_discounter_by(promotion_adjustment) }.compact
end
def build_discounter_by(promotion_adjustment)
discounter_class = DISCOUNTER_CLASSES[promotion_adjustment.adjustable_type]
return nil if discounter_class.nil?
discounter_class.new(order, promotion_adjustment)
end
def order_promotion_adjustments
order.all_adjustments.where(source_type: 'Spree::PromotionAction', eligible: true)
end
def find_line_item(id)
order.line_items.find_by(id: id)
end
end
end
Version data entries
14 entries across 14 versions & 2 rubygems