plugin/skins/skins.cs

using CounterStrikeSharp.API.Core;
using CounterStrikeSharp.API;
using CounterStrikeSharp.API.Modules.Memory.DynamicFunctions;

namespace Porning;

class SkinsManager
{
    private readonly BasePlugin plugin;
    private static readonly ulong SpawnedWeaponId = 16384; // Randomly chosen
    private static readonly MemoryFunctionVoid<nint, string, float> CAttributeListSetOrAddAttributeValueByName = new("55 48 89 E5 41 57 41 56 49 89 FE 41 55 41 54 53 48 89 F3 48 83 EC ? F3 0F 11 85");

    public SkinsManager(BasePlugin plugin)
    {
        this.plugin = plugin;
        plugin.RegisterListener<Listeners.OnEntitySpawned>((entity) => { OnEntitySpawned(entity); });
        plugin.RegisterListener<Listeners.OnEntityParentChanged>((entity, parent) => { OnEntityParentChanged(entity, parent); });
        plugin.RegisterEventHandler<EventItemPickup>(OnItemEquip);
        plugin.RegisterEventHandler<EventPlayerSpawn>(OnPlayerSpawn);
    }

    public void OnEntitySpawned(CEntityInstance entity)
    {
    }

    public void OnEntityParentChanged(CEntityInstance entity, CEntityInstance parent)
    {

    }

    private HookResult OnPlayerSpawn(EventPlayerSpawn @event, GameEventInfo info)
    {
        var player = @event.Userid;

        if (player == null || !player.IsValid) return HookResult.Continue;

        // On attend la frame suivante pour s'assurer que le moteur du jeu a fini 
        // d'attribuer le corps (Pawn) et l'équipement par défaut au joueur.
        Server.NextFrame(() =>
        {
            if (player.IsValid && player.PlayerPawn.IsValid && player.PawnIsAlive)
            {
                ApplySportGlovesPandorasBox(player);
                ApplyAgentSirBloodyMiamiDarryl(player);
            }
        });

        return HookResult.Continue;
    }

    private HookResult OnItemEquip(EventItemPickup @event, GameEventInfo info)
    {
        var player = @event.Userid;

        if (player == null || !player.IsValid) return HookResult.Continue;

        Server.NextFrame(() =>
        {
            if (!player.IsValid || !player.PlayerPawn.IsValid) return;

            var pawn = player.PlayerPawn.Value;
            if (pawn == null) return;

            var myWeapons = pawn.WeaponServices?.MyWeapons;
            if (myWeapons == null) return;

            // Reproduction de la méthode GiveOnItemPickup du dépôt GitHub
            foreach (var handle in myWeapons)
            {
                var weapon = handle.Value;

                if (weapon == null || !weapon.IsValid) continue;

                if (weapon.DesignerName == "weapon_ak47")
                {
                    ApplyAK47Skin1171(weapon, player);
                }
                else if (weapon.DesignerName.Contains("knife") || weapon.DesignerName.Contains("bayonet"))
                {
                    ApplyButterflyKnifeFade(weapon, player);
                }
            }
        });

        return HookResult.Continue;
    }

    public void ApplyAK47Skin1171(CBasePlayerWeapon weapon, CCSPlayerController player)
    {
        if (weapon.AttributeManager.Item.ItemDefinitionIndex != 7) return;

        weapon.AttributeManager.Item.AttributeList.Attributes.RemoveAll();
        weapon.AttributeManager.Item.NetworkedDynamicAttributes.Attributes.RemoveAll();

        weapon.AttributeManager.Item.ItemID = SpawnedWeaponId;
        weapon.AttributeManager.Item.ItemIDLow = (uint)(SpawnedWeaponId & 0xFFFFFFFF);
        weapon.AttributeManager.Item.ItemIDHigh = (uint)(SpawnedWeaponId >> 32);

        weapon.AttributeManager.Item.AccountID = (uint)player.SteamID;

        weapon.FallbackPaintKit = 1171;
        weapon.FallbackSeed = 0;
        weapon.FallbackWear = 0.01f;

        var handle = weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle;
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture prefab", 1171);
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture seed", 0);
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture wear", 0.01f);

        weapon.AcceptInput("SetBodygroup", value: "body,0");

        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_nFallbackPaintKit");
        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_nFallbackSeed");
        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_flFallbackWear");
    }

    public void ApplyButterflyKnifeFade(CBasePlayerWeapon weapon, CCSPlayerController player)
    {
        // Vérifier si l'arme est un couteau (pour ne pas transformer un pistolet en couteau)
        if (!weapon.DesignerName.Contains("knife") && !weapon.DesignerName.Contains("bayonet")) return;

        ushort butterflyDefIndex = 515;

        // Changement de la sous-classe pour charger le bon modèle d'animation et de mesh
        if (weapon.AttributeManager.Item.ItemDefinitionIndex != butterflyDefIndex)
        {
            weapon.AcceptInput("ChangeSubclass", value: butterflyDefIndex.ToString());
        }

        weapon.AttributeManager.Item.ItemDefinitionIndex = butterflyDefIndex;
        weapon.AttributeManager.Item.EntityQuality = 3; // Qualité "Étoile" / rare, obligatoire pour les couteaux

        weapon.AttributeManager.Item.AttributeList.Attributes.RemoveAll();
        weapon.AttributeManager.Item.NetworkedDynamicAttributes.Attributes.RemoveAll();

        weapon.AttributeManager.Item.ItemID = SpawnedWeaponId;
        weapon.AttributeManager.Item.ItemIDLow = (uint)(SpawnedWeaponId & 0xFFFFFFFF);
        weapon.AttributeManager.Item.ItemIDHigh = (uint)(SpawnedWeaponId >> 32);

        weapon.AttributeManager.Item.AccountID = (uint)player.SteamID;

        // Application du skin Fade (38)
        weapon.FallbackPaintKit = 38;
        weapon.FallbackSeed = 0; // Pattern 0, modifiable pour des variations de Fade
        weapon.FallbackWear = 0.01f; // Factory New

        var handle = weapon.AttributeManager.Item.NetworkedDynamicAttributes.Handle;
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture prefab", 38);
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture seed", 0);
        CAttributeListSetOrAddAttributeValueByName.Invoke(handle, "set item texture wear", 0.01f);

        weapon.AcceptInput("SetBodygroup", value: "body,0");

        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_nFallbackPaintKit");
        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_nFallbackSeed");
        Utilities.SetStateChanged(weapon, "CBaseEntity", "m_flFallbackWear");
    }

    public void ApplySportGlovesPandorasBox(CCSPlayerController player)
    {
        var pawn = player.PlayerPawn.Value;
        if (pawn == null || !pawn.IsValid) return;

        CEconItemView item = pawn.EconGloves;

        item.NetworkedDynamicAttributes.Attributes.RemoveAll();
        item.AttributeList.Attributes.RemoveAll();

        // 5030 = Sport Gloves
        item.ItemDefinitionIndex = 5030;

        item.ItemID = SpawnedWeaponId;
        item.ItemIDLow = (uint)(SpawnedWeaponId & 0xFFFFFFFF);
        item.ItemIDHigh = (uint)(SpawnedWeaponId >> 32);
        item.AccountID = (uint)player.SteamID;

        // 10037 = Pandora's Box, 0.06f = Factory New (min float pour ce skin)
        int paintKit = 10037;
        float wear = 0.06f;

        CAttributeListSetOrAddAttributeValueByName.Invoke(item.NetworkedDynamicAttributes.Handle, "set item texture prefab", paintKit);
        CAttributeListSetOrAddAttributeValueByName.Invoke(item.NetworkedDynamicAttributes.Handle, "set item texture seed", 0);
        CAttributeListSetOrAddAttributeValueByName.Invoke(item.NetworkedDynamicAttributes.Handle, "set item texture wear", wear);

        CAttributeListSetOrAddAttributeValueByName.Invoke(item.AttributeList.Handle, "set item texture prefab", paintKit);
        CAttributeListSetOrAddAttributeValueByName.Invoke(item.AttributeList.Handle, "set item texture seed", 0);
        CAttributeListSetOrAddAttributeValueByName.Invoke(item.AttributeList.Handle, "set item texture wear", wear);

        item.Initialized = true;

        // Rafraîchissement visuel pour éviter les superpositions de modèles
        player.ExecuteClientCommand("lastinv");

        Server.NextFrame(() =>
        {
            if (pawn.IsValid)
            {
                pawn.AcceptInput("SetBodygroup", value: "first_or_third_person,0");
                plugin.AddTimer(0.2f, () =>
                {
                    if (pawn.IsValid) pawn.AcceptInput("SetBodygroup", value: "first_or_third_person,1");
                });
            }
        });
    }

    public void ApplyAgentSirBloodyMiamiDarryl(CCSPlayerController player)
    {
        // L'agent est exclusif à l'équipe Terroriste (TeamNum 2)
        if (player.TeamNum != 2) return;

        Server.NextFrame(() =>
        {
            if (player.IsValid && player.PlayerPawn.IsValid && player.PawnIsAlive)
            {
                var pawn = player.PlayerPawn.Value;
                if (pawn != null)
                {
                    // CS2 requiert généralement le préfixe "characters/" au lieu de "agents/" en interne
                    pawn.SetModel("agents/models/tm_professional/tm_professional_varf.vmdl");
                }
            }
        });
    }
}