plugin/_old_plugin.cs

using CounterStrikeSharp.API;
using CounterStrikeSharp.API.Core;
using CounterStrikeSharp.API.Core.Attributes.Registration;
using CounterStrikeSharp.API.Modules.Commands;
using CounterStrikeSharp.API.Modules.Memory;
using CounterStrikeSharp.API.Modules.Memory.DynamicFunctions;
using CounterStrikeSharp.API.Modules.Utils;
using System.Runtime.InteropServices;
using System.Net.Http.Json;
using System.Text.Json.Serialization;

namespace OPorning;

public class OPorning : BasePlugin
{
    public override string ModuleName => "p0rning";
    public override string ModuleVersion => "1.0.0";

    private static readonly ulong WeaponId = 16384;
    
    private static readonly HttpClient Client = new HttpClient();

    public class LegacyClass
    {
        [JsonPropertyName("legacy")]
        public bool Legacy { get; set; }
    }

    private static readonly MemoryFunctionVoid<nint, string, float> CAttributeListSetOrAddAttributeValueByName = new(GameData.GetSignature("CAttributeList_SetOrAddAttributeValueByName"));
    
    private void Info(string message) => Console.WriteLine("\x1b[38;5;129m[AINDUSTRIES PRODUCTIONS] \x1b[38;5;82m[INFO] \x1b[38;5;255m{0}\x1b[0m", message);
    private void Debug(string message) => Console.WriteLine("\x1b[38;5;129m[AINDUSTRIES PRODUCTIONS] \x1b[38;5;214m[DEBUG] \x1b[38;5;255m{0}\x1b[0m", message);
    
    public override void Load(bool hotReload)
    {
        RegisterListener<Listeners.OnEntitySpawned>(OnEntityCreated);
        RegisterListener<Listeners.OnEntityParentChanged>((entity, parent) =>
        {
            var designerName = entity.DesignerName;

            if (!designerName.Contains("weapon_"))
            {
                return;
            }
            
            Debug("Parent changed for weapon");

            var weapon = new CBasePlayerWeapon(entity.Handle);
            if (weapon.AttributeManager.Item.ItemID != WeaponId)
            {
                Debug("Weapon is not a spawned weapon");
                return;
            }

            DebugWeapon(weapon);
            
            bool legacy = IsWeaponLegacy(weapon);
            
            //TODO: Check if this is necessary
            // Seems not necessary, will keep it for now.
            
            //CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle, "set item texture prefab", weapon.FallbackPaintKit);
            //CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle, "set item texture seed", weapon.FallbackSeed);
            //CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.AttributeList.Handle, "set item texture prefab", weapon.FallbackPaintKit);
            //CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.AttributeList.Handle, "set item texture seed", weapon.FallbackSeed);
            
            UpdateWeaponMeshGroupMask(weapon, legacy);
        });
        Info("Plugin Loaded");
    }

    [ConsoleCommand("css_give", "Give an item to yourself")]
    [CommandHelper(minArgs: 1, usage: "[name] [paint] [seed]", whoCanExecute: CommandUsage.CLIENT_AND_SERVER)]
    public void Give(CCSPlayerController? player, CommandInfo commandInfo)
    {
        string weaponName = commandInfo.GetArg(1);
        string paint = commandInfo.GetArg(2);
        int paintId = 0;
        if (paint != "")
        {
            paintId = Int32.Parse(paint);
        }
        
        string pattern = commandInfo.GetArg(3);
        int patternId = 1;
        if (pattern != "")
        {
            patternId = Int32.Parse(pattern);
        }
        
        if (player == null) return;

        var entity = player.GiveNamedItem(weaponName);

        var weaponEntity = new CCSWeaponBase(entity);
        var baseWeapon = new CBasePlayerWeapon(weaponEntity.Handle);
        
        commandInfo.ReplyToCommand("Weapon given");
        Server.NextFrame(() =>
        {
            GivePlayerWeaponSkin(player, baseWeapon, paintId, patternId);
            Info("Weapon given and skin applied.");
        });
    }
    
    private static void UpdateWeaponMeshGroupMask(CBaseEntity weapon, bool isLegacy = false)
    {
        if (weapon.CBodyComponent?.SceneNode == null) return;
        var skeleton = weapon.CBodyComponent.SceneNode.GetSkeletonInstance();
        var value = (ulong)(isLegacy ? 2 : 1);

        if (skeleton.ModelState.MeshGroupMask != value)
        {
            skeleton.ModelState.MeshGroupMask = value;
        }
    }
    
    private static void UpdatePlayerWeaponMeshGroupMask(CCSPlayerController player, CBasePlayerWeapon weapon, bool isLegacy)
    {
        UpdateWeaponMeshGroupMask(weapon, isLegacy);

        var viewModel = GetPlayerViewModel(player);
        if (viewModel == null || viewModel.Weapon.Value == null ||
            viewModel.Weapon.Value.Index != weapon.Index) return;
			
        UpdateWeaponMeshGroupMask(viewModel, isLegacy);
        Utilities.SetStateChanged(viewModel, "CBaseEntity", "m_CBodyComponent");
    }
    
    private static CBaseViewModel? GetPlayerViewModel(CCSPlayerController player)
    {
        if (player.PlayerPawn.Value == null || player.PlayerPawn.Value.ViewModelServices == null) return null;
        CCSPlayer_ViewModelServices viewModelServices = new(player.PlayerPawn.Value.ViewModelServices!.Handle);
        var ptr = viewModelServices.Handle + Schema.GetSchemaOffset("CCSPlayer_ViewModelServices", "m_hViewModel");
        var references = MemoryMarshal.CreateSpan(ref ptr, 3);
        var viewModel = (CHandle<CBaseViewModel>)Activator.CreateInstance(typeof(CHandle<CBaseViewModel>), references[0])!;
        return viewModel.Value == null ? null : viewModel.Value;
    }

    private void GivePlayerWeaponSkin(CCSPlayerController? player, CBasePlayerWeapon baseWeapon, int paint, int pattern)
    {
        var weapon = new CEconEntity(baseWeapon.Handle);
        baseWeapon.AttributeManager.Item.AttributeList.Attributes.RemoveAll();
        baseWeapon.AttributeManager.Item.NetworkedDynamicAttributes.Attributes.RemoveAll();
            
        weapon.FallbackPaintKit = paint;
        weapon.FallbackSeed = pattern;
        weapon.FallbackWear = 0.01f;
        weapon.AttributeManager.Item.AccountID = (uint)player.SteamID;
            
        /*
        CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle, "set item texture prefab", weapon.FallbackPaintKit);
        CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle, "set item texture seed", weapon.FallbackSeed);
        
        CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.AttributeList.Handle, "set item texture prefab", weapon.FallbackPaintKit);
        CAttributeListSetOrAddAttributeValueByName.Invoke(weapon.AttributeManager.Item.AttributeList.Handle, "set item texture seed", weapon.FallbackSeed);
        */
            
        weapon.AttributeManager.Item.ItemID = WeaponId;
        weapon.AttributeManager.Item.ItemIDLow = (uint)WeaponId & 0xFFFFFFFF;
        weapon.AttributeManager.Item.ItemIDHigh = (uint)WeaponId >> 32;

        bool legacy = IsWeaponLegacy(baseWeapon);
        
        UpdatePlayerWeaponMeshGroupMask(player, baseWeapon, legacy);
        Info($"Gave weapon to {player.PlayerName}");
        DebugWeapon(baseWeapon);
    }
    
    private void OnEntityCreated(CEntityInstance entity)
    {
        // TODO: Check if user has a loadout set, if so change the skins.
    }

    private void DebugWeapon(CBasePlayerWeapon weapon)
    {
        Debug("[WEAPON DEBUG]");
        Console.WriteLine("[Entity ID]: {0}", weapon.AttributeManager.Item.ItemID);
        Console.WriteLine("[Owner ID]: {0}", weapon.AttributeManager.Item.AccountID);
        Console.WriteLine("[Owner ID Low]: {0}", weapon.AttributeManager.Item.ItemIDLow);
        Console.WriteLine("[Owner ID High]: {0}", weapon.AttributeManager.Item.ItemIDHigh);
        Console.WriteLine("[Paint]: {0}", weapon.FallbackPaintKit);
        Console.WriteLine("[Pattern]: {0}", weapon.FallbackSeed);
        Console.WriteLine("[DefIndex]: {0}", weapon.AttributeManager.Item.ItemDefinitionIndex);
    }

    private bool IsWeaponLegacy(CBasePlayerWeapon weapon)
    {
        var designerName = weapon.DesignerName;
        var paint = weapon.FallbackPaintKit;
        HttpResponseMessage response = Client.GetAsync($"http://127.0.0.1:8900/api/legacy/{designerName}/{paint}").GetAwaiter().GetResult();
        LegacyClass? value = null;
        if (response.IsSuccessStatusCode)
        {
            value = response.Content.ReadFromJsonAsync<LegacyClass>().GetAwaiter().GetResult();
        }
        return value?.Legacy ?? false;
    }
}