CleanCode-GildedRoseKata/Inventory.java

import java.util.ArrayList;
public class Inventory {
    
    private Item[] items;
    private ArrayList<String> specialItems;
    
    public Inventory(Item[] items) {
        super();
        this.items = items;
        this.specialItems = new ArrayList<String>();
        this.specialItems.add("Aged Brie");
        this.specialItems.add("Backstage passes to a TAFKAL80ETC concert");
        this.specialItems.add("Sulfuras, Hand of Ragnaros");
        this.specialItems.add("Conjured");
    }   
    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            //updateSulfurusQuality(i);
            updateNormalItemQuality(i);
            updateAgedBrieQuality(i);
            updateBackStageQuality(i);
            updateConjuredQuality(i);
            updateSellIn(i);
        }
    }
    
    public void updateSellIn(int i) {
        if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
            items[i].setSellIn(items[i].getSellIn() - 1);
        }
    }
    
    public boolean determineSpecialQuality(int i) {
        if (specialItems.contains(items[i].getName())) {
            return true;
        }
        return false;
    }
    
    public boolean pastSellIn(int i) {
        if (items[i].getSellIn() < 0) {
            return true;
        }
        return false;
    }
    
    public void updateAgedBrieQuality(int index) {
        if (items[index].getName().equals("Aged Brie")) {
            if (pastSellIn(index)) {
                changeQuality(index, 2);
            } else {
                changeQuality(index, 1);
            }
            pastMaxQuality(index);
        }
    }
    
    public void updateBackStageQuality(int index) {
        if (items[index].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {
            
            if (items[index].getSellIn() > 10) {
                changeQuality(index, 1);
            } else if (items[index].getSellIn() > 5) {
                changeQuality(index, 2);
            } else if (items[index].getSellIn() >= 0) {
                changeQuality(index, 3);
            } else {
                items[index].setQuality(0);
            }
            pastMaxQuality(index);
        }
    }
    
    public void updateConjuredQuality(int index) {
        if (items[index].getName().equals("Conjured")){
            changeQuality(index, -2);
            pastZeroQuality(index);
        }
    }
    
    public void updateSulfurusQuality(int i) {
        if (items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
            //change nothing
        }
    }
    
    public void updateNormalItemQuality(int index) {
        if (!determineSpecialQuality(index)) {
            if (pastSellIn(index)) {
                changeQuality(index, -2);
            } else {
                changeQuality(index, -1);
            }
            pastZeroQuality(index);
        }
    }
    
    public void changeQuality(int index, int amount) {
        items[index].setQuality(items[index].getQuality() + amount);
    }
    
    public void pastMaxQuality(int index) {
        if (items[index].getQuality() > 50) {
            items[index].setQuality(50);
        }
    }
    
    public void pastZeroQuality(int index) {
        if (items[index].getQuality() < 0) {
            items[index].setQuality(0);
        }
    }
}