MPS' Bottles

gistfile1.txt

class Bottles
  MAX_BOTTLE = 99
  MIN_BOTTLE = 0

  def song
    verses(MAX_BOTTLE, MIN_BOTTLE)
  end

  def verses(high_bottle_number, low_bottle_number)
    high_bottle_number.downto(low_bottle_number).map do |bottle_number|
      verse(bottle_number)
    end.join("\n")
  end

  def verse(bottle_number)
    case bottle_number
    when 0
      "No more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, #{MAX_BOTTLE} bottles of beer on the wall.\n"
    when 1
      "1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.\n"
    else
      "#{bottle_number} bottles of beer on the wall, #{bottle_number} bottles of beer.\nTake one down and pass it around, #{bottle_number-1} #{container_name(bottle_number-1)} of beer on the wall.\n"
    end
  end

  def container_name(quantity)
    quantity == 1 ? "bottle" : "bottles"
  end
end