using System;

/// <summary>
/// This interface defines a subject that can select an item. This is the IItemContainer counterpart of the observer
/// pattern. It is used so that either items can directly observe, and know whether to be active or not, or
/// a shop view can tell the items what to do, active or not.
/// </summary>
public interface IItemSelector
{
    // Require some way to register observers so that they can be notified when selection changes
    void RegisterOnSelect(IItemContainer observer);
    void RemoveOnSelect(IItemContainer observer);
    void OnSelect(Item selected);
    
    // Actual selection methods, so we have a selection to begin with
    void SelectItem(Item selected);
    void SelectItemByIndex(int index);
}