# encoding: utf-8

module OneApm
  class Transaction
    module TransactionName

      def overridden_name=(name)
        @overridden_name = Helper.correctly_encoded(name)
      end

      def default_name=(name)
        @default_name = Helper.correctly_encoded(name)
      end

      def make_transaction_name(name, category = nil)
        "#{OneApm::TransactionNamer.prefix_for_category(self, category)}#{name}"
      end

      def set_default_transaction_name(name, category)
        return log_frozen_name(name) if name_frozen?
        if influences_transaction_name?(category)
          self.default_name = name
          @category = category if category
        end
      end

      def set_overriding_transaction_name(name, category)
        return log_frozen_name(name) if name_frozen?
        if influences_transaction_name?(category)
          self.overridden_name = name
          @category = category if category
        end
      end

      def name_last_frame(name)
        frame_stack.last.name = name
      end

      def log_frozen_name(name)
        OneApm::Manager.logger.warn("Attempted to rename transaction to '#{name}' after transaction name was already frozen as '#{@frozen_name}'.")
        nil
      end

      def influences_transaction_name?(category)
        !category || frame_stack.size == 1 || similar_category?(category)
      end

      def best_name
        @frozen_name  || @overridden_name ||
          @default_name || Transaction::UNKNOWN_METRIC
      end

      def name_set?
        (@overridden_name || @default_name) ? true : false
      end

      def promoted_transaction_name(name)
        if name.start_with?(Transaction::MIDDLEWARE_PREFIX)
          "#{Transaction::CONTROLLER_PREFIX}#{name}"
        else
          name
        end
      end

      def freeze_name_and_execute_if_not_ignored
        if !name_frozen?
          name = promoted_transaction_name(best_name)
          name = OneApm::Manager.agent.transaction_rules.rename(name)
          @name_frozen = true

          if name.nil?
            ignore!
            @frozen_name = best_name
          else
            @frozen_name = name
          end
        end

        if block_given? && !@ignore_this_transaction
          yield
        end
      end

      def name_frozen?
        @frozen_name ? true : false
      end

    end
  end
end