module Semantic
  module NotificationUtil
    class << self
      # pattern could be either a string 'start_processing.action_controller' or a regex /\.action_controller$/
      # FIXME: weird behaviour, order impact!!!!
      # For instance:
      #     OK
      #         NotificationUtil.clear_subscribers(/\.action_controller$/)
      #         NotificationUtil.clear_subscribers(/\.action_view$/)
      #     NOPE
      #         NotificationUtil.clear_subscribers(/\.action_view$/)
      #         NotificationUtil.clear_subscribers(/\.action_controller$/)
      def clear_subscribers(pattern)
        ActiveSupport::LogSubscriber.subscribers.each { |sub| unattach(sub, pattern) }
      end

      private

      def subscriber_patterns(subscriber)
        subscriber.patterns.respond_to?(:keys) ? subscriber.patterns.keys : subscriber.patterns
      end

      def unattach(subscriber, pattern)
        subscriber_patterns(subscriber).each do |sub_pattern|
          ActiveSupport::Notifications.notifier.listeners_for(sub_pattern).each do |sub|
            next unless sub.instance_variable_get(:@delegate) == subscriber
            next unless pattern.match(sub_pattern)

            puts "FOUND subscriber=#{subscriber} for sub_pattern=#{sub_pattern} with logger #{subscriber.logger.name}"
            puts subscriber.class.module_parent.const_source_location(subscriber.class.to_s)&.first

            ActiveSupport::Notifications.unsubscribe(sub)
          end
        end
        # ActiveSupport::LogSubscriber.subscribers.delete(subscriber)
      end
    end
  end
end