public class Inventory {
    private Item[] items;

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

    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            if(items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")){
                increaseQualityByOne(i);
                increaseQualityForBackstagePasses(i);
            }else if(items[i].getName().equals("Aged Brie")){
                increaseQualityByOne(i);
            }else{
                if (items[i].getQuality() > 0) {
                    if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
                        items[i].setQuality(items[i].getQuality() - 1);
                    }
                }
            }

            if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
                items[i].setSellIn(items[i].getSellIn() - 1);
            }

            if (items[i].getSellIn() < 0) {
                if (!items[i].getName().equals("Aged Brie")) {
                    if (!items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {
                        if (items[i].getQuality() > 0) {
                            if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
                                items[i].setQuality(items[i].getQuality() - 1);
                            }
                        }
                    } else {
                        items[i].setQuality(items[i].getQuality()
                            - items[i].getQuality());
                    }
                } else {
                    increaseQualityByOne(i);
                }
            }

        }
    }

    public void increaseQualityByOne(int i){
        if(items[i].getQuality() < 50){
            items[i].setQuality(items[i].getQuality() + 1);
        }
    }

    public void increaseQualityForBackstagePasses(int i){
        if(items[i].getSellIn() < 11) {
            increaseQualityByOne(i);
        } 
        if(items[i].getSellIn() < 6){
            increaseQualityByOne(i);
        }
    }
}