module TwitterFriendly
  module REST
    module FriendsAndFollowers
      def friendship?(from, to, options = {})
        @twitter.send(__method__, from, to, options)
      end

      MAX_IDS_PER_REQUEST = 5000

      %i(friend_ids follower_ids).each do |name|
        define_method(name) do |*args|
          options = {count: MAX_IDS_PER_REQUEST}.merge(args.extract_options!)
          if options[:super_operation]
            options[:super_super_operation] = options[:super_operation]
            options[:super_operation] = name
          end
          args << options
          fetch_resources_with_cursor(name, args)
        end
      end

      def friends(*args)
        options = args.extract_options!.merge(super_operation: :friends)
        ids = friend_ids(*args, options)
        users(ids, options)
      end

      def followers(*args)
        options = args.extract_options!.merge(super_operation: :followers)
        ids = follower_ids(*args, options)
        users(ids, options)
      end

      def friend_ids_and_follower_ids(*args)
        options = {super_operation: :friend_ids_and_follower_ids, parallel: true}.merge(args.extract_options!)

        if options[:parallel]
          require 'parallel'

          parallel(in_threads: 2) do |batch|
            batch.friend_ids(*args, options)
            batch.follower_ids(*args, options)
          end
        else
          [friend_ids(*args, options), follower_ids(*args, options)]
        end
      end

      def friends_and_followers(*args)
        options = args.extract_options!.merge(super_operation: :friends_and_followers)

        following_ids, followed_ids = friend_ids_and_follower_ids(*args, options)
        unique_ids = (following_ids + followed_ids).uniq
        people = _users(unique_ids).index_by { |u| u[:id] }
        [people.slice(*following_ids).values, people.slice(*followed_ids).values]

        # parallel(in_threads: 2) do |batch|
        #   batch.friends(*args, options)
        #   batch.followers(*args, options)
        # end
      end
    end
  end
end