refactored_bottles.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)
      "#{quantity(number).capitalize} #{container(number)} of beer on the wall, #{quantity(number)} #{container(number)} of beer.
#{action(number)}, #{quantity(succ(number))} #{container(number-1)} of beer on the wall.
"
  end

  def succ(number)
    if number == 0
      '99'
    else
      quantity(number-1)
    end
  end

  def action(number)
    if number == 0
      "Go to the store and buy some more"
    else
      "Take #{pronoun(number)} down and pass it around"
    end
  end

  def container(number)
    if number == 1
      'bottle'
    else
      'bottles'
    end
  end

  def quantity(number)
    if number == 0
      'no more'
    else
      number.to_s
    end
  end

  def pronoun(number)
    if number == 1
      'it'
    else
      'one'
    end
  end
end