1 files changed, 96 insertions, 0 deletions
diff --git a/app/controllers/concerns/analytics/cycle_analytics/stage_actions.rb b/app/controllers/concerns/analytics/cycle_analytics/stage_actions.rb
new file mode 100644
index 00000000000..eebc40f33f4
--- /dev/null
+++ b/app/controllers/concerns/analytics/cycle_analytics/stage_actions.rb
@@ -0,0 +1,96 @@
+# frozen_string_literal: true
+
+module Analytics
+  module CycleAnalytics
+    module StageActions
+      include Gitlab::Utils::StrongMemoize
+      extend ActiveSupport::Concern
+
+      included do
+        include CycleAnalyticsParams
+
+        before_action :validate_params, only: %i[median]
+      end
+
+      def index
+        result = list_service.execute
+
+        if result.success?
+          render json: cycle_analytics_configuration(result.payload[:stages])
+        else
+          render json: { message: result.message }, status: result.http_status
+        end
+      end
+
+      def median
+        render json: { value: data_collector.median.seconds }
+      end
+
+      def average
+        render json: { value: data_collector.average.seconds }
+      end
+
+      def records
+        serialized_records = data_collector.serialized_records do |relation|
+          add_pagination_headers(relation)
+        end
+
+        render json: serialized_records
+      end
+
+      def count
+        render json: { count: data_collector.count }
+      end
+
+      private
+
+      def parent
+        raise NotImplementedError
+      end
+
+      def value_stream_class
+        raise NotImplementedError
+      end
+
+      def add_pagination_headers(relation)
+        Gitlab::Pagination::OffsetHeaderBuilder.new(
+          request_context: self,
+          per_page: relation.limit_value,
+          page: relation.current_page,
+          next_page: relation.next_page,
+          prev_page: relation.prev_page,
+          params: permitted_cycle_analytics_params
+        ).execute(exclude_total_headers: true, data_without_counts: true)
+      end
+
+      def stage
+        @stage ||= ::Analytics::CycleAnalytics::StageFinder.new(parent: parent, stage_id: params[:id]).execute
+      end
+
+      def data_collector
+        @data_collector ||= Gitlab::Analytics::CycleAnalytics::DataCollector.new(
+          stage: stage,
+          params: request_params.to_data_collector_params
+        )
+      end
+
+      def value_stream
+        @value_stream ||= value_stream_class.build_default_value_stream(parent)
+      end
+
+      def list_params
+        { value_stream: value_stream }
+      end
+
+      def list_service
+        Analytics::CycleAnalytics::Stages::ListService.new(parent: parent, current_user: current_user, params: list_params)
+      end
+
+      def cycle_analytics_configuration(stages)
+        stage_presenters = stages.map { |s| ::Analytics::CycleAnalytics::StagePresenter.new(s) }
+
+        Analytics::CycleAnalytics::ConfigurationEntity.new(stages: stage_presenters)
+      end
+    end
+  end
+end