# frozen_string_literal: true

module Ci
  module Queue
    class BuildQueueService
      include ::Gitlab::Utils::StrongMemoize

      attr_reader :runner

      def initialize(runner)
        @runner = runner
      end

      def new_builds
        strategy.new_builds
      end

      ##
      # This is overridden in EE
      #
      def builds_for_shared_runner
        strategy.builds_for_shared_runner
      end

      # rubocop:disable CodeReuse/ActiveRecord
      def builds_for_group_runner
        if strategy.use_denormalized_data_strategy?
          strategy.builds_for_group_runner
        else
          # Workaround for weird Rails bug, that makes `runner.groups.to_sql` to return `runner_id = NULL`
          groups = ::Group.joins(:runner_namespaces).merge(runner.runner_namespaces)

          hierarchy_groups = Gitlab::ObjectHierarchy
            .new(groups)
            .base_and_descendants

          projects = Project.where(namespace_id: hierarchy_groups)
            .with_group_runners_enabled
            .with_builds_enabled
            .without_deleted

          relation = new_builds.where(project: projects)

          order(relation)
        end
      end

      def builds_for_project_runner
        relation = new_builds
          .where(project: runner_projects_relation)

        order(relation)
      end

      def builds_queued_before(relation, time)
        relation.queued_before(time)
      end

      def builds_for_protected_runner(relation)
        relation.ref_protected
      end

      def builds_matching_tag_ids(relation, ids)
        strategy.builds_matching_tag_ids(relation, ids)
      end

      def builds_with_any_tags(relation)
        strategy.builds_with_any_tags(relation)
      end

      def order(relation)
        strategy.order(relation)
      end

      def execute(relation)
        strategy.build_ids(relation)
      end

      private

      def strategy
        strong_memoize(:strategy) do
          if ::Feature.enabled?(:ci_pending_builds_queue_source, runner)
            Queue::PendingBuildsStrategy.new(runner)
          else
            Queue::BuildsTableStrategy.new(runner)
          end
        end
      end

      def runner_projects_relation
        runner
          .runner_projects
          .select('"ci_runner_projects"."project_id"::bigint')
      end
    end
  end
end

Ci::Queue::BuildQueueService.prepend_mod_with('Ci::Queue::BuildQueueService')