public class Inventory {
    private Item[] items;
    private final int MAX_QUALITY = 50;
    private final String AGED_BRIE_NAME = "Aged Brie";
    private final String BACKSTAGE_PASS_NAME = "Backstage passes to a TAFKAL80ETC concert";
    private final String NORMAL_ITEM_NAME = "+5 Dexterity Vest";
    private final String CONJURED_ITEM_NAME = "Conjured Flower Bouquet";
    private final String SULFURAS = "Sulfuras, Hand of Ragnaros";
    
    public Inventory(Item[] items) {
        super();
        this.items = items;
    }


    public void updateQuality() {
        for (int i = 0; i < items.length; i++) {
            if (items[i].getName().equals(SULFURAS)) {
                continue;
            }
            switch (items[i].getName()) {
                case BACKSTAGE_PASS_NAME :
                    updateTickets(items[i]);
                    break;
                case AGED_BRIE_NAME :
                    updateBrie(items[i]);
                    break;
                case CONJURED_ITEM_NAME :
                    updateConjuredItem(items[i]);
                    break;
                default : 
                    updateNormalItem(items[i]);
                    break;
            }
            items[i].setSellIn(items[i].getSellIn() - 1);
        }
    }
    
    public void updateTickets(Item ticket) {
        if (ticket.getSellIn() < 0) {
            ticket.setQuality(0);
        }
        else if (ticket.getQuality() >= 48) {
            ticket.setQuality(50);
        }
        else {
            if (ticket.getSellIn() >= 11) {
                ticket.setQuality(ticket.getQuality() + 1);
            }
            else if (ticket.getSellIn() >= 6 && ticket.getSellIn() < 11) {
                ticket.setQuality(ticket.getQuality() + 2);
            }
            else if (ticket.getSellIn() < 6) {
                ticket.setQuality(ticket.getQuality() + 3);
            }
        }
    }
    
    public void updateBrie(Item brie) {
        if (brie.getSellIn() > 0 && brie.getQuality() < 50) {
            brie.setQuality(brie.getQuality() + 1);
        }
        else if (brie.getSellIn() < 0) {
            brie.setQuality(brie.getQuality() + 2);
        }
    }
    
    public void updateNormalItem(Item item) {
        if (item.getQuality() > 0) {
            item.setQuality(item.getQuality() - 1);
        }
        if (item.getSellIn() < 0) {
            item.setQuality(item.getQuality() - 1);
        }
    }
    
    public void updateConjuredItem(Item item) {
         if (item.getQuality() > 0) {
            item.setQuality(item.getQuality() - 2);
        }
        if (item.getSellIn() < 0) {
            item.setQuality(item.getQuality() - 2);
        }
    }
}