# frozen_string_literal: true

module Admin
  class PropagateIntegrationService
    include PropagateService

    def propagate
      update_inherited_integrations

      create_integration_for_groups_without_integration if Feature.enabled?(:group_level_integrations)
      create_integration_for_projects_without_integration
    end

    private

    # rubocop: disable Cop/InBatches
    # rubocop: disable CodeReuse/ActiveRecord
    def update_inherited_integrations
      Service.where(type: integration.type, inherit_from_id: integration.id).in_batches(of: BATCH_SIZE) do |batch|
        bulk_update_from_integration(batch)
      end
    end
    # rubocop: enable Cop/InBatches
    # rubocop: enable CodeReuse/ActiveRecord

    # rubocop: disable CodeReuse/ActiveRecord
    def bulk_update_from_integration(batch)
      # Retrieving the IDs instantiates the ActiveRecord relation (batch)
      # into concrete models, otherwise update_all will clear the relation.
      # https://stackoverflow.com/q/34811646/462015
      batch_ids = batch.pluck(:id)

      Service.transaction do
        batch.update_all(service_hash)

        if data_fields_present?
          integration.data_fields.class.where(service_id: batch_ids).update_all(data_fields_hash)
        end
      end
    end
    # rubocop: enable CodeReuse/ActiveRecord

    def create_integration_for_groups_without_integration
      loop do
        batch = Group.uncached { group_ids_without_integration(integration, BATCH_SIZE) }

        bulk_create_from_integration(batch, 'group') unless batch.empty?

        break if batch.size < BATCH_SIZE
      end
    end

    def service_hash
      @service_hash ||= integration.to_service_hash
        .tap { |json| json['inherit_from_id'] = integration.id }
    end

    # rubocop:disable CodeReuse/ActiveRecord
    def group_ids_without_integration(integration, limit)
      services = Service
        .select('1')
        .where('services.group_id = namespaces.id')
        .where(type: integration.type)

      Group
        .where('NOT EXISTS (?)', services)
        .limit(limit)
        .pluck(:id)
    end
    # rubocop:enable CodeReuse/ActiveRecord
  end
end