price_bucket

class Calculator::PriceBucket < Calculator
  preference :minimal_amount, :decimal, :default => 0
  preference :normal_amount, :decimal, :default => 0
  preference :discount_amount, :decimal, :default => 0

  def self.description
    I18n.t("price_bucket")
  end

  def self.register
    super
    #Promotion.register_calculator(self)
    ShippingMethod.register_calculator(self)
  end

  # as object we always get line items, as calculable we have Coupon, ShippingMethod
  def compute(object) 
      base = object.line_items.inject(0) {|sum, li| sum += li.amount } 
      if base < self.preferred_minimal_amount 
        self.preferred_normal_amount 
      else 
        self.preferred_discount_amount 
      end 
  end
end