ItemPickupCondition.cs

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using System.Collections.Generic;
using Terraria.Achievements;
 
namespace Terraria.GameContent.Achievements;
 
public class ItemPickupCondition : AchievementCondition
{
    private const string Identifier = "ITEM_PICKUP";
 
    private static Dictionary<short, List<ItemPickupCondition>> _listeners = new Dictionary<short, List<ItemPickupCondition>>();
 
    private static bool _isListenerHooked;
 
    private short[] _itemIds;
 
    private ItemPickupCondition(short itemId)
        : base("ITEM_PICKUP_" + itemId)
    {
        _itemIds = new short[1] { itemId };
        ListenForPickup(this);
    }
 
    private ItemPickupCondition(short[] itemIds)
        : base("ITEM_PICKUP_" + itemIds[0])
    {
        _itemIds = itemIds;
        ListenForPickup(this);
    }
 
    private static void ListenForPickup(ItemPickupCondition condition)
    {
        if (!_isListenerHooked)
        {
            AchievementsHelper.OnItemPickup += ItemPickupListener;
            _isListenerHooked = true;
        }
        for (int i = 0; i < condition._itemIds.Length; i++)
        {
            if (!_listeners.ContainsKey(condition._itemIds[i]))
            {
                _listeners[condition._itemIds[i]] = new List<ItemPickupCondition>();
            }
            _listeners[condition._itemIds[i]].Add(condition);
        }
    }
 
    private static void ItemPickupListener(Player player, short itemId, int count)
    {
        if (player.whoAmI != Main.myPlayer || !_listeners.ContainsKey(itemId))
        {
            return;
        }
        foreach (ItemPickupCondition item in _listeners[itemId])
        {
            item.Complete();
        }
    }
 
    public static AchievementCondition Create(params short[] items)
    {
        return new ItemPickupCondition(items);
    }
 
    public static AchievementCondition Create(short item)
    {
        return new ItemPickupCondition(item);
    }
 
    public static AchievementCondition[] CreateMany(params short[] items)
    {
        AchievementCondition[] array = new AchievementCondition[items.Length];
        for (int i = 0; i < items.Length; i++)
        {
            array[i] = new ItemPickupCondition(items[i]);
        }
        return array;
    }
}