public class Inventory {
    private Item[] items;
    public Inventory(Item[] items) {
        super();
        this.items = items;
    }

    public void bringQualityToRange (int i) {
        if (items[i].getQuality() > 50) {
            items[i].setQuality(50);
        }
        if (items[i].getQuality() < 0) {
            items[i].setQuality(0);
        }
    }

    public void updateBrie(int i) {
        if (items[i].getSellIn() > 0) {
            items[i].setQuality(items[i].getQuality() + 1);
        } else if (items[i].getSellIn() <= 0) {
            items[i].setQuality(items[i].getQuality() + 2);
        }
        items[i].setSellIn(items[i].getSellIn() - 1);
        bringQualityToRange(i);
    }

    public void updateBackstagePasses(int i) {
        if (items[i].getSellIn() < 0) {
            items[i].setQuality(0);
        } else if (items[i].getSellIn() < 6) {
            items[i].setQuality(items[i].getQuality() + 3);
        } else if (items[i].getSellIn() < 11) {
            items[i].setQuality(items[i].getQuality() + 2);
        } else if (items[i].getSellIn() >= 11) {
            items[i].setQuality(items[i].getQuality() + 1);
        }
        items[i].setSellIn(items[i].getSellIn() - 1);
        bringQualityToRange(i);
    }

    public void updateConjured (int i) {
        if (items[i].getSellIn() > 0){
            items[i].setQuality(items[i].getQuality() - 2);
        } else {
            items[i].setQuality(items[i].getQuality() - 4);
        }
        items[i].setSellIn(items[i].getSellIn() - 1);
        bringQualityToRange(i);
    }

    public void updateNormalItem (int i) {
        if (items[i].getSellIn() >= 0){
            items[i].setQuality(items[i].getQuality() - 1);
        } else {
            items[i].setQuality(items[i].getQuality() - 2);
        }
        items[i].setSellIn(items[i].getSellIn() - 1);
        bringQualityToRange(i);
    }

    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            if (items[i].getName().equals("Aged Brie")) {
                updateBrie(i);
            } else if (items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
            } else if (items[i].getName().equals("Conjured")) {
                updateConjured(i);
            } else if (items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {
                updateBackstagePasses(i);
            } 
            else {
                updateNormalItem(i);
            }
        }
    }
}