clayton/consummo

module Consummo
  class FeedFetcher
    def initialize(client: FeedClient.new, factory: FeedItemFactory.new)
      @client  = client
      @factory = factory
    end

    def fetch(feed, last_modified = nil)
      @client.fetch_and_parse(feed.uri).map do |entry|
        next if old_entry?(entry, last_modified)
        item = @factory.build(entry)
        item.attributes = {:feed_id => feed.id}

        item
      end.compact
    end

  private
    def old_entry?(entry, last_modified)
      return false if last_modified.nil?
      last_modified > entry.last_modified
    end
  end
end