public class Inventory {
    private Item[] items;

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

    public void updateQuality() {//<---------------------------------------------------method to update an item's quality
        for (int i = 0; i < items.length; i++) {//<------------------------------------iterating over the "items" array
            if (!items[i].getName().equals("Aged Brie")
            && !items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {//<-if items[i] ISNT Aged Brie or BSP
                if (items[i].getQuality() > 0) {//<------------------------------------if items[i]'s current quality is greater than 0
                    if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {//<-if items[i] isn't Sulfuras
                        items[i].setQuality(items[i].getQuality() - 1);//<-------------reduce the quality of items[i] by 1
                    }
                }
            } else {//<---------------------------------------------------------------else
                if (items[i].getQuality() < 50) {//<----------------------------------if items[i] quality < 50(max)
                    items[i].setQuality(items[i].getQuality() + 1);//<----------------increase quality of item[i] by 1

                    if (items[i].getName() == "Backstage passes to a TAFKAL80ETC concert") {//<-if items[i]'s name is BSP
                        if (items[i].getSellIn() < 11) {//<---------------------------if items[i]'s sell by date is less than 11 days from now
                            if (items[i].getQuality() < 50) {//<----------------------if items[i]'s quality is less than 50
                                items[i].setQuality(items[i].getQuality() + 1);//<----increase the quality of items[i] by 1
                            }
                        }

                        if (items[i].getSellIn() < 6) {
                            if (items[i].getQuality() < 50) {
                                items[i].setQuality(items[i].getQuality() + 1);
                            }
                        }
                    }
                }
            }//<-----------------------------------------------------------------------if items[i] ISNT Aged Brie, or BSP

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