bottles

bottles.rb

class Bottles
  def verse(verse_number)
    return final_verse if verse_number == 1
    return empty_verse if verse_number == 0
    normal_verse(verse_number)
  end

  def verses(max, min)
    max.downto(min).map { |verse| Bottles.new.verse(verse) }.join("\n")
  end

  def song
    Bottles.new.verses(99, 0)
  end

  private

  def normal_verse(verse_number)
    <<-VERSE
#{verse_number} #{pluralize_bottle(verse_number)} of beer on the wall, #{verse_number} #{pluralize_bottle(verse_number)} of beer.
Take one down and pass it around, #{verse_number - 1} #{pluralize_bottle(verse_number -1)} of beer on the wall.
VERSE
  end

  def final_verse
    <<-VERSE
1 bottle of beer on the wall, 1 bottle of beer.
Take it down and pass it around, no more bottles of beer on the wall.
VERSE
  end

  def empty_verse
    <<-VERSE
No more bottles of beer on the wall, no more bottles of beer.
Go to the store and buy some more, 99 bottles of beer on the wall.
VERSE
  end

  def pluralize_bottle(count)
    if count == 1
      "bottle"
    else
      "bottles"
    end
  end
end