18F/C2

# NOTE must define class method "purchase_amount_column_name"
# before "include"-ing this concern
module PurchaseCardMixin
  extend ActiveSupport::Concern

  included do
    def self.max_amount
      fiscals = {
        2015      => 3000,
        2016      => 3500,
        "default" => 3500,
      }
      now = Time.zone.now
      this_fiscal = FiscalYearFinder.new(now.year, now.month).run
      fiscals[this_fiscal] || fiscals["default"]
    end

    validates name.constantize.purchase_amount_column_name, numericality: {
      less_than_or_equal_to: name.constantize.max_amount,
      message: "must be less than or equal to #{ActiveSupport::NumberHelper.number_to_currency(name.constantize.max_amount)}"
    }
    validates name.constantize.purchase_amount_column_name, numericality: {
      greater_than_or_equal_to: 1.0,
      message: "must be greater than or equal to #{ActiveSupport::NumberHelper.number_to_currency(1)}"
    }
  end
end