# frozen_string_literal: true

module Groups
  module ImportExport
    class ImportService
      attr_reader :current_user, :group, :params

      def initialize(group:, user:)
        @group = group
        @current_user = user
        @shared = Gitlab::ImportExport::Shared.new(@group)
      end

      def execute
        if valid_user_permissions? && import_file && restorer.restore
          notify_success

          @group
        else
          notify_error!
        end

      ensure
        remove_import_file
      end

      private

      def import_file
        @import_file ||= Gitlab::ImportExport::FileImporter.import(
          importable: @group,
          archive_file: nil,
          shared: @shared
        )
      end

      def restorer
        @restorer ||=
          if ndjson?
            Gitlab::ImportExport::Group::TreeRestorer.new(
              user: @current_user,
              shared: @shared,
              group: @group
            )
          else
            Gitlab::ImportExport::Group::LegacyTreeRestorer.new(
              user: @current_user,
              shared: @shared,
              group: @group,
              group_hash: nil
            )
          end
      end

      def ndjson?
        ::Feature.enabled?(:group_import_ndjson, @group&.parent, default_enabled: true) &&
          File.exist?(File.join(@shared.export_path, 'tree/groups/_all.ndjson'))
      end

      def remove_import_file
        upload = @group.import_export_upload

        return unless upload&.import_file&.file

        upload.remove_import_file!
        upload.save!
      end

      def valid_user_permissions?
        if current_user.can?(:admin_group, group)
          true
        else
          @shared.error(::Gitlab::ImportExport::Error.permission_error(current_user, group))

          false
        end
      end

      def notify_success
        @shared.logger.info(
          group_id:   @group.id,
          group_name: @group.name,
          message:    'Group Import/Export: Import succeeded'
        )
      end

      def notify_error
        @shared.logger.error(
          group_id:   @group.id,
          group_name: @group.name,
          message:    "Group Import/Export: Errors occurred, see '#{Gitlab::ErrorTracking::Logger.file_name}' for details"
        )
      end

      def notify_error!
        notify_error

        raise Gitlab::ImportExport::Error.new(@shared.errors.to_sentence)
      end
    end
  end
end
