class Appsignal::Probes::GvlProbe

def self.dependencies_present?
  defined?(::GVLTools) && gvltools_0_2_or_newer? && ruby_3_2_or_newer? &&
    !Appsignal::System.jruby?
end

def self.gvltools_0_2_or_newer?
  Gem::Version.new(::GVLTools::VERSION) >= Gem::Version.new("0.2.0")
end

def self.ruby_3_2_or_newer?
  Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.2.0")
end

def call
  probe_global_timer
  probe_waiting_threads if @gvl_tools::WaitingThreads.enabled?
end

def initialize(appsignal: Appsignal, gvl_tools: ::GVLTools)
  Appsignal.internal_logger.debug("Initializing GVL probe")
  @appsignal = appsignal
  @gvl_tools = gvl_tools
  # Store the process name and ID at initialization time
  # to avoid picking up changes to the process name at runtime
  @process_name = File.basename($PROGRAM_NAME).split.first || "[unknown process]"
  @process_id = Process.pid
end

def probe_global_timer
  monotonic_time_ns = @gvl_tools::GlobalTimer.monotonic_time
  gauge_delta :gvl_global_timer, monotonic_time_ns do |time_delta_ns|
    if time_delta_ns > 0
      time_delta_ms = time_delta_ns / 1_000_000
      set_gauges_with_hostname_and_process(
        "gvl_global_timer",
        time_delta_ms
      )
    end
  end
end

def probe_waiting_threads
  set_gauges_with_hostname_and_process(
    "gvl_waiting_threads",
    @gvl_tools::WaitingThreads.count
  )
end

def set_gauges_with_hostname_and_process(name, value)
  set_gauge_with_hostname(name, value, {
    :process_name => @process_name,
    :process_id => @process_id
  })
  # Also set the gauge without the process name and ID for
  # compatibility with existing automated dashboards
  set_gauge_with_hostname(name, value)
end