using Unity.Entities;
using UnityEngine;

namespace ProjectM.Server
{
    /// <summary>
    /// Animation is a CLIENT-ONLY presentation concern (Rukhanka netcode OFF — see DR-022). Rukhanka still
    /// touches the SERVER world: its deformation systems use [WorldSystemFilter(Default)] (Default includes
    /// ServerSimulation), so a headless server would run skinned-mesh prep + mesh deformation on the player's
    /// baked bones/meshes that nothing renders. (Rukhanka's bootstrap creates RukhankaAnimationSystemGroup on
    /// the server too, but leaves it EMPTY — it only fills the update list for client/local worlds.)
    ///
    /// This server-only one-shot disables every Rukhanka.Runtime system in the server world. Disabling a
    /// ComponentSystemGroup stops all its children (managed AND unmanaged ISystems), so this covers the whole
    /// Rukhanka stack — the server then does ZERO animation/deformation work. Matched by assembly name (no
    /// hard Rukhanka type ref → no asmdef change), so it survives Rukhanka updates.
    /// </summary>
    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
    public partial class ServerStripAnimationSystem : SystemBase
    {
        protected override void OnUpdate()
        {
            int disabled = 0;
            foreach (var sys in World.Systems)
            {
                if (sys == null || !sys.Enabled) continue;
                if (sys.GetType().Assembly.GetName().Name == "Rukhanka.Runtime")
                {
                    sys.Enabled = false;
                    disabled++;
                }
            }
            Debug.Log($"[ProjectM] ServerStripAnimationSystem: disabled {disabled} Rukhanka systems on the server world (animation is client-only).");
            Enabled = false; // one-shot
        }
    }
}