The Gilded Rose kata

GildedRose.js

var GildedRose = function () {
  console.log("OMGHAI!");
  var items = [];
  items.push(new Item("+5 Dexterity Vest", 10, 20));
  items.push(new Item("Aged Brie", 2, 0));
  items.push(new Item("Elixir of the Mongoose", 5, 7));
  items.push(new Item("Sulfuras, Hand of Ragnaros", 0, 80));
  items.push(new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20));
  items.push(new Item("Conjured Mana Cake", 3, 6));
  GildedRose.updateQuality(items);
};
GildedRose.updateQuality = function (items) {
  for (var i = 0; i < items.length; i++) {
    if ("Aged Brie" != items[i].name && "Backstage passes to a TAFKAL80ETC concert" != items[i].name) {
      if (items[i].quality > 0) {
        if ("Sulfuras, Hand of Ragnaros" != items[i].name) {
          items[i].quality = items[i].quality - 1
        }
      }
    } else {
      if (items[i].quality < 50) {
        items[i].quality = items[i].quality + 1
        if ("Backstage passes to a TAFKAL80ETC concert" == items[i].name) {
          if (items[i].sellIn < 11) {
            if (items[i].quality < 50) {
              items[i].quality = items[i].quality + 1
            }
          }
          if (items[i].sellIn < 6) {
            if (items[i].quality < 50) {
              items[i].quality = items[i].quality + 1
            }
          }
        }
      }
    }
    if ("Sulfuras, Hand of Ragnaros" != items[i].name) {
      items[i].sellIn = items[i].sellIn - 1;
    }
    if (items[i].sellIn < 0) {
      if ("Aged Brie" != items[i].name) {
        if ("Backstage passes to a TAFKAL80ETC concert" != items[i].name) {
          if (items[i].quality > 0) {
            if ("Sulfuras, Hand of Ragnaros" != items[i].name) {
              items[i].quality = items[i].quality - 1
            }
          }
        } else {
          items[i].quality = items[i].quality - items[i].quality
        }
      } else {
        if (items[i].quality < 50) {
          items[i].quality = items[i].quality + 1
        }
      }
    }
  }
  return items;
};

GildedRoseSpecs.js

describe("GildedRose shop manager", function () {
  it("does some stuff", function() {
     expect(1).toBe(1);
  });
});

item.js

var Item = function (name, sellIn, quality) {
  this.name = name;
  this.sellIn = sellIn;
  this.quality = quality;
};