# frozen_string_literal: true

module Types
  module Ci
    # rubocop: disable Graphql/AuthorizeTypes
    class StageType < BaseObject
      graphql_name 'CiStage'

      field :name, GraphQL::STRING_TYPE, null: true,
        description: 'Name of the stage.'
      field :groups, Ci::GroupType.connection_type, null: true,
        extras: [:lookahead],
        description: 'Group of jobs for the stage.'
      field :detailed_status, Types::Ci::DetailedStatusType, null: true,
            description: 'Detailed status of the stage.'

      def detailed_status
        object.detailed_status(context[:current_user])
      end

      # Issues one query per pipeline
      def groups(lookahead:)
        key = ::Gitlab::Graphql::BatchKey.new(object, lookahead, object_name: :stage)

        BatchLoader::GraphQL.for(key).batch(default_value: []) do |keys, loader|
          by_pipeline = keys.group_by(&:pipeline)
          include_needs = keys.any? { |k| k.requires?(%i[nodes jobs nodes needs]) }

          by_pipeline.each do |pl, key_group|
            project = pl.project
            indexed = key_group.index_by(&:id)

            jobs_for_pipeline(pl, indexed.keys, include_needs).each do |stage_id, statuses|
              key = indexed[stage_id]
              groups = ::Ci::Group.fabricate(project, key.stage, statuses)
              loader.call(key, groups)
            end
          end
        end
      end

      private

      # rubocop: disable CodeReuse/ActiveRecord
      def jobs_for_pipeline(pipeline, stage_ids, include_needs)
        results = pipeline.latest_statuses.where(stage_id: stage_ids)
        results = results.preload(:needs) if include_needs

        results.group_by(&:stage_id)
      end
      # rubocop: enable CodeReuse/ActiveRecord
    end
  end
end
