module ParallelTests

# File lib/parallel_tests.rb, line 66
def bundler_enabled?
  return true if Object.const_defined?(:Bundler)

  previous = nil
  current = File.expand_path(Dir.pwd)

  until !File.directory?(current) || current == previous
    filename = File.join(current, "Gemfile")
    return true if File.exist?(filename)
    previous = current
    current = File.expand_path("..", current)
  end

  false
end

# File lib/parallel_tests.rb, line 111
def delta
  before = now.to_f
  yield
  now.to_f - before
end

# File lib/parallel_tests.rb, line 28
def determine_multiple(multiple)
  Float(
    [
      multiple,
      ENV["PARALLEL_TEST_MULTIPLY_PROCESSES"],
      DEFAULT_MULTIPLY_PROCESSES
    ].detect { |c| !c.to_s.strip.empty? }
  )
end

# File lib/parallel_tests.rb, line 18
def determine_number_of_processes(count)
  Integer(
    [
      count,
      ENV["PARALLEL_TEST_PROCESSORS"],
      Parallel.processor_count
    ].detect { |c| !c.to_s.strip.empty? }
  )
end

# File lib/parallel_tests.rb, line 82
def first_process?
  ENV["TEST_ENV_NUMBER"].to_i <= 1
end

# File lib/parallel_tests.rb, line 86
def last_process?
  current_process_number = ENV['TEST_ENV_NUMBER']
  total_processes = ENV['PARALLEL_TEST_GROUPS']
  return true if current_process_number.nil? && total_processes.nil?
  current_process_number = '1' if current_process_number.nil?
  current_process_number == total_processes
end

# File lib/parallel_tests.rb, line 107
def now
  Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

# File lib/parallel_tests.rb, line 103
def number_of_running_processes
  pids.count
end

# File lib/parallel_tests.rb, line 55
def pid_file_path
  ENV.fetch('PARALLEL_PID_FILE')
end

# File lib/parallel_tests.rb, line 51
def pids
  @pids ||= Pids.new(pid_file_path)
end

# File lib/parallel_tests.rb, line 59
def stop_all_processes
  pids.all.each { |pid| Process.kill(:INT, pid) }
rescue Errno::ESRCH, Errno::EPERM
  # Process already terminated, do nothing
end

# File lib/parallel_tests.rb, line 98
def wait_for_other_processes_to_finish
  return unless ENV["TEST_ENV_NUMBER"]
  sleep 1 until number_of_running_processes <= 1
end

# File lib/parallel_tests.rb, line 38
def with_pid_file
  Tempfile.open('parallel_tests-pidfile') do |f|
    ENV['PARALLEL_PID_FILE'] = f.path
    # Pids object should be created before threads will start adding pids to it
    # Otherwise we would have to use Mutex to prevent creation of several instances
    @pids = pids
    yield
  ensure
    ENV['PARALLEL_PID_FILE'] = nil
    @pids = nil
  end
end

# File lib/parallel_tests.rb, line 94
def with_ruby_binary(command)
  WINDOWS ? [RUBY_BINARY, '--', command] : [command]
end