module SalesReporter
  class Sale
    attr_reader :date, :amount, :quantity, :country, :shop

    def initialize(date_, amount, quantity, country, shop)
      @date = sanitize_date(date_)
      raise TypeError('sanitize failed') unless @date.is_a? Date
      @amount = amount
      @quantity = quantity
      @country = country
      @shop = shop
    end

    private

    def sanitize_date(d)
      case d.class.to_s
      when "String"
        return Date.parse(d)
      when "Date"
        return d
      else
        raise TypeError.new('Expected date argument to be of type Date or String')
      end
    end
  end
end