NPCKillsTracker.cs

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using System.Collections.Generic;
using System.IO;
using Terraria.GameContent.NetModules;
using Terraria.ID;
using Terraria.Net;
 
namespace Terraria.GameContent.Bestiary;
 
public class NPCKillsTracker : IPersistentPerWorldContent, IOnPlayerJoining
{
    private object _entryCreationLock = new object();
 
    public const int POSITIVE_KILL_COUNT_CAP = 999999999;
 
    private Dictionary<string, int> _killCountsByNpcId;
 
    public NPCKillsTracker()
    {
        _killCountsByNpcId = new Dictionary<string, int>();
    }
 
    public void RegisterKill(NPC npc)
    {
        string bestiaryCreditId = npc.GetBestiaryCreditId();
        _killCountsByNpcId.TryGetValue(bestiaryCreditId, out var value);
        value++;
        lock (_entryCreationLock)
        {
            _killCountsByNpcId[bestiaryCreditId] = Utils.Clamp(value, 0, 999999999);
        }
        if (Main.netMode == 2)
        {
            NetManager.Instance.Broadcast(NetBestiaryModule.SerializeKillCount(npc.netID, value));
        }
    }
 
    public int GetKillCount(NPC npc)
    {
        string bestiaryCreditId = npc.GetBestiaryCreditId();
        return GetKillCount(bestiaryCreditId);
    }
 
    public void SetKillCountDirectly(string persistentId, int killCount)
    {
        lock (_entryCreationLock)
        {
            _killCountsByNpcId[persistentId] = Utils.Clamp(killCount, 0, 999999999);
        }
    }
 
    public int GetKillCount(string persistentId)
    {
        _killCountsByNpcId.TryGetValue(persistentId, out var value);
        return value;
    }
 
    public void Save(BinaryWriter writer)
    {
        lock (_killCountsByNpcId)
        {
            writer.Write(_killCountsByNpcId.Count);
            foreach (KeyValuePair<string, int> item in _killCountsByNpcId)
            {
                writer.Write(item.Key);
                writer.Write(item.Value);
            }
        }
    }
 
    public void Load(BinaryReader reader, int gameVersionSaveWasMadeOn)
    {
        int num = reader.ReadInt32();
        for (int i = 0; i < num; i++)
        {
            string key = reader.ReadString();
            int value = reader.ReadInt32();
            _killCountsByNpcId[key] = value;
        }
    }
 
    public void ValidateWorld(BinaryReader reader, int gameVersionSaveWasMadeOn)
    {
        int num = reader.ReadInt32();
        for (int i = 0; i < num; i++)
        {
            reader.ReadString();
            reader.ReadInt32();
        }
    }
 
    public void Reset()
    {
        _killCountsByNpcId.Clear();
    }
 
    public void OnPlayerJoining(int playerIndex)
    {
        foreach (KeyValuePair<string, int> item in _killCountsByNpcId)
        {
            if (ContentSamples.NpcNetIdsByPersistentIds.TryGetValue(item.Key, out var value))
            {
                NetManager.Instance.SendToClient(NetBestiaryModule.SerializeKillCount(value, item.Value), playerIndex);
            }
        }
    }
}