module ActivityFeed
  # Configuration settings for ActivityFeed.
  module Configuration
    # Redis instance.
    attr_accessor :redis

    # Proc that will be called for loading an item from an ORM (e.g. ActiveRecord) or ODM (e.g. Mongoid). Proc will be called with the ID of the item from the feed.
    attr_accessor :item_loader

    # ActivityFeed namespace for Redis.
    attr_writer :namespace

    # Indicates whether or not aggregation is enabled.
    attr_writer :aggregate

    # Key used in Redis for an individual's aggregate feed.
    attr_writer :aggregate_key

    # Page size to be used when paging through the activity feed.
    attr_writer :page_size

    # Yield self to be able to configure ActivityFeed with block-style configuration.
    #
    # Example:
    #
    #   ActivityFeed.configure do |configuration|
    #     configuration.redis = Redis.new
    #     configuration.namespace = 'activity_feed'
    #     configuration.aggregate = false
    #     configuration.aggregate_key = 'aggregate'
    #     configuration.page_size = 25
    #   end
    def configure
      yield self
    end

    # ActivityFeed namespace for Redis.
    #
    # @return the ActivityFeed namespace or the default of 'activity_feed' if not set.
    def namespace
      @namespace ||= 'activity_feed'
    end

    # Indicates whether or not aggregation is enabled.
    #
    # @return whether or not aggregation is enabled or the default of +false+ if not set.
    def aggregate
      @aggregate ||= false
    end

    # Key used in Redis for an individul's aggregate feed.
    #
    # @return the key used in Redis for an individual's aggregate feed or the default of 'aggregate' if not set.
    def aggregate_key
      @aggregate_key ||= 'aggregate'
    end

    # Default page size.
    # 
    # @return the page size or the default of 25 if not set.
    def page_size
      @page_size ||= 25
    end
  end
end