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Contents
module Workarea
module Pricing
class Discount
# This class coordinates with a {FlatOrPercentOff} discount to calculate
# how much should be given against a certin amount off.
#
class AmountCalculator
delegate :amount_type, :amount, to: :@discount
def initialize(discount)
@discount = discount
end
# Whether this calculator is based on percent
# off the price.
#
# @return [Boolean]
#
def percent?
amount_type == :percent
end
# Whether this calculator is based on a flat amount
# off the price.
#
# @return [Boolean]
#
def flat?
amount_type == :flat
end
# The percent representation of the amount off.
#
# @return [Float]
#
def percent
amount / 100
end
# Calculate the amount off of the passed price.
#
# @param [Money] the price to be discounted
# @return [Money]
#
def calculate(price, quantity = 1)
if percent?
price * quantity * percent
elsif price.to_m < amount.to_m
price * quantity
else
amount.to_m * quantity
end
end
end
end
end
end
Version data entries
62 entries across 62 versions & 1 rubygems