module CompletionsConcern
  extend ActiveSupport::Concern

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

  def display_time(seconds)
    if seconds > 3600
      hours = seconds / 3600
      return hours.to_s + ":" + display_time(seconds % 3600)
    elsif seconds > 60
      minutes = seconds / 60
      return pad(minutes) + ":" + display_time(seconds % 60)
    end
    pad(seconds)
  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))
  end
end