GildedRose-Refactoring-Kata/Java/src/main/java/com/gildedrose/GildedRose.java

package com.gildedrose;

import com.gildedrose.item.Backstage;
import com.gildedrose.item.Brie;
import com.gildedrose.item.Item;
import com.gildedrose.item.Sulfuras;

class GildedRose {
    Item[] items;


    public GildedRose(Item[] items) {
        this.items = items;
    }

    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            if (!items[i].name.equals(Brie.BRIE)
                    && !items[i].name.equals(Backstage.BACKSTAGE)) {
                if (items[i].quality > 0) {
                    if (!items[i].name.equals(Sulfuras.SULFURAS)) {
                        items[i].quality = items[i].quality - 1;
                    }
                }
            } else {
                if (items[i].quality < 50) {
                    items[i].quality = items[i].quality + 1;

                    if (items[i].name.equals(Backstage.BACKSTAGE)) {
                        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 (!items[i].name.equals(Sulfuras.SULFURAS)) {
                items[i].sellIn = items[i].sellIn - 1;
            }

            if (items[i].sellIn < 0) {
                if (!items[i].name.equals(Brie.BRIE)) {
                    if (!items[i].name.equals(Backstage.BACKSTAGE)) {
                        if (items[i].quality > 0) {
                            if (!items[i].name.equals(Sulfuras.SULFURAS)) {
                                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;
                    }
                }
            }
        }
    }
}