class GildedRose

  def initialize(items)
    @items = items
  end

  def update_quality()
    @items.each do |item|
      case item.name
      when "Sulfuras, Hand of Ragnaros"
      when "Backstage passes to a TAFKAL80ETC concert"
        item.quality += 1 if item.sell_in > 10
        item.quality += 2 if item.sell_in <= 10 and item.sell_in > 5
        item.quality += 3 if item.sell_in <= 5
        item.sell_in -= 1
        item.quality = 0 if item.sell_in < 0 
      when "Aged Brie"
        item.sell_in -= 1
        if item.quality < 50 
          if item.sell_in < 0
            item.quality += 2
          else
            item.quality += 1
          end
        end
      when /Conjured/
        item.sell_in -= 1
        if item.quality > 0 
          item.quality -= 2
          item.quality -= 2 if item.sell_in < 0
        end
      else
        item.sell_in -= 1
        if item.quality > 0
          item.quality -= 1
          item.quality -= 1 if item.sell_in < 0
        end
      end
      if item.quality < 0
        item.quality = 0
      end
    end 
  end
end

class Item
  attr_accessor :name, :sell_in, :quality

  def initialize(name, sell_in, quality)
    @name = name
    @sell_in = sell_in
    @quality = quality
  end

  def to_s()
    "#{@name}, #{@sell_in}, #{@quality}"
  end
end