module Fog
  module Rackspace
    class Queues

      class Real

        # This operation returns queue statistics, including how many messages are in the queue, categorized by status.
        #
        # @param [String] queue_name Specifies the name of the queue.
        # @return [Excon::Response] response
        # @raise [Fog::Rackspace::Queues::NotFound] - HTTP 404
        # @raise [Fog::Rackspace::Queues::BadRequest] - HTTP 400
        # @raise [Fog::Rackspace::Queues::InternalServerError] - HTTP 500
        # @raise [Fog::Rackspace::Queues::ServiceError]
        # @see http://docs.rackspace.com/queues/api/v1.0/cq-devguide/content/GET_getQueueStats__version__queues__queue_name__stats_queue-operations-dle001.html
        def get_queue_stats(queue_name)
          request(
            :expects => 200,
            :method => 'GET',
            :path => "queues/#{queue_name}/stats"
          )
        end

      end

      class Mock
        def get_queue_stats(queue_name)
          queue = mock_queue!(queue_name)

          payload = {
            "claimed" => queue.claimed,
            "total" => queue.total,
            "free" => queue.free
          }

          report_message(payload, "oldest", queue.oldest)
          report_message(payload, "newest", queue.newest)

          response = Excon::Response.new
          response.status = 200
          response.body = { "messages" => payload }
          response
        end

        private

        def report_message(payload, description, element)
          return unless element

          ctime = Time.at(element.created).utc
          payload[description] = {
            "age" => element.age,
            "href" => element.href,
            "created" => ctime.strftime("%Y-%m-%dT%I:%M:%SZ")
          }
        end
      end

    end
  end
end