class Inventory
{

    private Item lastItemCollected;
    public Item lastItemCollected()
    {
        return lastItemCollected;
    }

    Dictionary<int, int> items = new Dictionary<int, int>();
    Dictionary<int, int> questItems = new Dictionary<int, int>();

    public void getitem(Item i, int quanitity)
    {
        if (quanitity < 0)
        {
            Console.Write("Error: recieved invalid item quanitity to getitem(). No item will be collected.");
            return;
        }

        if (i.IsQuestItem())
        {
            questItems[i.identifier] += quanitity;
        }
        else
        {
            items[i.identifier] += quanitity;
        }
    }

    public void loseitem(Item i, int quantity)
    {
        if (quantity < 0)
        {
            Console.Write("Error: recieved invalid item quanitity to loseitem(). No item will be lost.");
            return;
        }

        if (i.IsQuestItem())
        {
            questItems[i.identifier] -= quantity;
        }
        else
        {
            normalItems[i.identifier] -= quantity;
        }

        if (lastItemCollected == i)
        {
            lastItemCollected = null;
        }

        AchievementSystem.instance.DidModifyItem("lose", i.identifier, quantity);
    }

    public void didpickupitem(Item i)
    {
        lastItemCollected = i;
    }
}