module Spree
  class Report
    class TimedResult < Result

      def build_report_observations
        query_results
        build_empty_observations
        populate_observations
      end

      def build_empty_observations
        @observations = Spree::Report::DateSlicer.slice_into(start_date, end_date, time_scale, self.class::Observation)
      end

      def populate_observations
        observation_iter = @observations.each
        current_observation = @observations.present? ? observation_iter.next : nil
        @results.each do |result|
          if current_observation.present?
            begin
              until current_observation.describes? result, time_scale
                current_observation = observation_iter.next
              end

              current_observation.populate(result)
              current_observation = observation_iter.next
            rescue StopIteration
              break
            end
          end
        end
      end

      def headers
        [time_headers] + super
      end

      private def time_headers
        {
          name: Spree.t(time_dimension, scope: [:admin]),
          value: time_dimension,
          type: :string,
          sortable: false
        }
      end
    end
  end
end