# encoding: utf-8

require 'one_apm/inst/transaction_base'
require 'one_apm/inst/rack/rack'
require 'one_apm/inst/rack/rack_builder'

LibraryDetection.defer do
  named :rack

  depends_on do
    defined?(::Rack) && defined?(::Rack::Builder)
  end

  executes do
    OneApm::Manager.logger.info 'Installing deferred Rack instrumentation'

    class ::Rack::Builder
      class << self
        attr_accessor :_oa_deferred_detection_ran
      end
      self._oa_deferred_detection_ran = false

      include ::OneApm::Agent::Instrumentation::RackBuilder

      alias_method :to_app_without_oneapm, :to_app
      alias_method :to_app, :to_app_with_oneapm_deferred_library_detection

      unless OneApm::Manager.config[:disable_rack_middleware]
        OneApm::Manager.logger.info 'Installing Rack::Builder middleware instrumentation'
        alias_method :run_without_oneapm, :run
        alias_method :run, :run_with_oneapm

        alias_method :use_without_oneapm, :use
        alias_method :use, :use_with_oneapm
      end
    end
  end
end