module CompletionsConcern
  extend ActiveSupport::Concern

  def pad(n)
    if n > 9
      return n.to_s
    end
    "0" + n.to_s
  end

  def display_time(time)
    h = time / 3600
    m = (time % 3600) / 60
    s = (time % 3600) % 60
    if h > 0
      return h.to_s + ":" + pad(m) + ":" + pad(s)
    elsif m > 0
      return m.to_s + ":" + pad(s)
    end
    s.to_s
  end

  def extend_completions!(contestant)
    current_time_from_start = 0
    contestant.completions.order(:time_seconds).each do |completion|
      completion.update(display_time_from_start: display_time(completion.time_seconds),
                        display_relative_time: display_time(completion.time_seconds - current_time_from_start))
      current_time_from_start = completion.time_seconds
    end
    contestant.update(display_time: display_time(current_time_from_start), time_seconds: current_time_from_start)
  end
end