module Seymour

  module Distributable
    extend ActiveSupport::Concern

    included do
    end

    module ClassMethods
      attr_accessor :audience_names, :feed_class_names

      def audience(*names)
        options = names.extract_options!
        names.each do |name|
          class_name = options[:class_name] || name
          feed_class_name = "#{class_name.downcase.to_s.singularize}_feed".camelize
          audience_to_feed_classes[name] = feed_class_name
        end
      end

      def audience_names
        audience_to_feed_classes.keys
      end

      def feed_class_names
        audience_to_feed_classes.values
      end

      def feeds_for(activity)
        audience_to_feed_classes.map do |audience_name, feed_class_name|
          activity.send(audience_name).map { |member|
            feed_class_name.constantize.new(member)
          }
        end.flatten
      end

      private

      def audience_to_feed_classes
        @audience_to_feed_classes ||= {}
      end

    end

    module InstanceMethods

      def distribute
        feeds.map { |feed| feed.push(self) }
      end

      def feeds
        self.class.feeds_for(self)
      end

    end
  end


end