Solve Ruby Woskhop BeerSong

beer_song.rb

class BeerSong
  def verse(nb_bottle)
    s = "#{pluralize(nb_bottle, capitalize: true)} of beer on the wall, #{pluralize(nb_bottle)} of beer.\n"
    s + if nb_bottle == 0
          "Go to the store and buy some more, 99 bottles of beer on the wall.\n"
        else
          "Take #{it_or_one(nb_bottle - 1)} down and pass it around, #{pluralize(nb_bottle - 1)} of beer on the wall.\n"
        end
  end

  def verses(nb_bottle1, nb_bottle2)
    s = ""
    for i in nb_bottle2..nb_bottle1
      if i == nb_bottle2
        s = verse(i) + s
      else
        s = verse(i) + "\n" + s
      end
    end
    s
  end

  def lyrics
    verses(99, 0)
  end

  private

  def pluralize(nb_bottle, capitalize: false)
    if nb_bottle == 1
      "#{nb_bottle} bottle"
    elsif nb_bottle == 0
      capitalize ? "no more bottles".capitalize : "no more bottles"
    else
      "#{nb_bottle} bottles"
    end
  end

  def it_or_one(nb_bottle_left)
    if nb_bottle_left == 0
      'it'
    else
      'one'
    end
  end
end

module BookKeeping
  VERSION = 2
end