shameless_green.rb

class Bottles

  def song
    verses(99, 0)
  end

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

  def verse(number)
    case number
    when 2
      "2 bottles of beer on the wall, 2 bottles of beer.
Take one down and pass it around, 1 bottle of beer on the wall.
"
    when 1
      "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.
"
    when 0
      "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.
"
    else
      "#{number} bottles of beer on the wall, #{number} bottles of beer.
Take one down and pass it around, #{number-1} bottles of beer on the wall.
"
    end

  end
end