NPCKilledCondition.cs

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using System.Collections.Generic;
using Terraria.Achievements;
 
namespace Terraria.GameContent.Achievements;
 
public class NPCKilledCondition : AchievementCondition
{
    private const string Identifier = "NPC_KILLED";
 
    private static Dictionary<short, List<NPCKilledCondition>> _listeners = new Dictionary<short, List<NPCKilledCondition>>();
 
    private static bool _isListenerHooked;
 
    private short[] _npcIds;
 
    private NPCKilledCondition(short npcId)
        : base("NPC_KILLED_" + npcId)
    {
        _npcIds = new short[1] { npcId };
        ListenForPickup(this);
    }
 
    private NPCKilledCondition(short[] npcIds)
        : base("NPC_KILLED_" + npcIds[0])
    {
        _npcIds = npcIds;
        ListenForPickup(this);
    }
 
    private static void ListenForPickup(NPCKilledCondition condition)
    {
        if (!_isListenerHooked)
        {
            AchievementsHelper.OnNPCKilled += NPCKilledListener;
            _isListenerHooked = true;
        }
        for (int i = 0; i < condition._npcIds.Length; i++)
        {
            if (!_listeners.ContainsKey(condition._npcIds[i]))
            {
                _listeners[condition._npcIds[i]] = new List<NPCKilledCondition>();
            }
            _listeners[condition._npcIds[i]].Add(condition);
        }
    }
 
    private static void NPCKilledListener(Player player, short npcId)
    {
        if (player.whoAmI != Main.myPlayer || !_listeners.ContainsKey(npcId))
        {
            return;
        }
        foreach (NPCKilledCondition item in _listeners[npcId])
        {
            item.Complete();
        }
    }
 
    public static AchievementCondition Create(params short[] npcIds)
    {
        return new NPCKilledCondition(npcIds);
    }
 
    public static AchievementCondition Create(short npcId)
    {
        return new NPCKilledCondition(npcId);
    }
 
    public static AchievementCondition[] CreateMany(params short[] npcs)
    {
        AchievementCondition[] array = new AchievementCondition[npcs.Length];
        for (int i = 0; i < npcs.Length; i++)
        {
            array[i] = new NPCKilledCondition(npcs[i]);
        }
        return array;
    }
}