Solution to https://github.com/sandimetz/99bottles

bottles.rb

class Bottles
  def song
    verses(99, 0)
  end

  def verses(from, to)
    (to..from).to_a.reverse.map { |n| verse(n) }.join("\n")
  end

  def verse(number)
    if number == 0
      return <<~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

    starting = number
    remaining = number - 1

    <<~VERSE
      #{how_many(starting)} of beer on the wall, #{how_many(starting)} of beer.
      Take #{take(remaining)} down and pass it around, #{how_many(remaining)} of beer on the wall.
    VERSE
  end

  def wall_count(number)
  end

  def instruction(remaining)
  end

  def take(starting)
    starting >= 1 ? "one" : "it"
  end

  def how_many(number)
    case number
    when 0
      "no more bottles"
    when 1
      "1 bottle"
    else
      "#{number} bottles"
    end
  end
end