module Vernier::Autorun

def self.at_exit
  stop if running?
end

def self.running?
  !!@collector
end

def self.start
  interval = options.fetch(:interval, 500).to_i
  allocation_sample_rate = options.fetch(:allocation_sample_rate, 0).to_i
  hooks = options.fetch(:hooks, "").split(",")
  STDERR.puts("starting profiler with interval #{interval}")
  @collector = Vernier::Collector.new(:wall, interval:, allocation_sample_rate:, hooks:)
  @collector.start
end

def self.stop
  result = @collector.stop
  @collector = nil
  output_path = options[:output]
  output_path ||= Tempfile.create(["profile", ".vernier.json.gz"]).path
  result.write(out: output_path)
  STDERR.puts(result.inspect)
  STDERR.puts("written to #{output_path}")
end

def self.toggle
  running? ? stop : start
end