class ParallelTests::Test::RuntimeLogger

def log(test, time)
  return unless message = message(test, time)
  with_locked_log do |logfile|
    logfile.seek(0, IO::SEEK_END)
    logfile.puts message
  end
end

def log_test_run(test)
  prepare
  result = nil
  time = ParallelTests.delta { result = yield }
  log(test, time)
  result
end

def logfile
  ParallelTests::Test::Runner.runtime_log
end

def message(test, delta)
  return unless method = test.public_instance_methods(true).detect { |m| m =~ /^test_/ }
  filename = test.instance_method(method).source_location.first.sub("#{Dir.pwd}/", "")
  "#{filename}:#{delta}"
end

def prepare
  return if @@prepared
  @@prepared = true
  FileUtils.mkdir_p(File.dirname(logfile))
  File.write(logfile, '')
end

def unique_log
  with_locked_log do |logfile|
    separator = "\n"
    groups = logfile.read.split(separator).map { |line| line.split(":") }.group_by(&:first)
    lines = groups.map do |file, times|
      time = "%.2f" % times.map(&:last).map(&:to_f).sum
      "#{file}:#{time}"
    end
    logfile.rewind
    logfile.write(lines.join(separator) + separator)
    logfile.truncate(logfile.pos)
  end
end

def with_locked_log
  File.open(logfile, File::RDWR | File::CREAT) do |logfile|
    logfile.flock(File::LOCK_EX)
    yield logfile
  end
end