if defined?(ActionMailer)
  # Mailer for email notification of ActivityNotificaion.
  class ActivityNotification::Mailer < ActivityNotification.config.parent_mailer.constantize
    include ActivityNotification::Mailers::Helpers

    # Sends notification email.
    # @param [Notification] notification Notification instance to send email
    # @param [Hash] options Options for notification email
    # @option options [String, Symbol] :fallback (:default) Fallback template to use when MissingTemplate is raised
    def send_notification_email(notification, options = {})
      options[:fallback] ||= :default
      if options[:fallback] == :none
        options.delete(:fallback)
      end
      if notification.target.notification_email_allowed?(notification.notifiable, notification.key) and 
         notification.notifiable.notification_email_allowed?(notification.target, notification.key)
        notification_mail(notification, options)
      end
    end

  end
end