#if UNITY_EDITOR
using ProjectM.Simulation;
using Unity.Collections;
using Unity.Entities;
using Unity.Mathematics;
using Unity.Transforms;

namespace ProjectM.Server
{
    /// <summary>
    /// 07-20 sandbox combat target: keeps ONE planted <see cref="TargetDummyTag"/> dummy alive in the DevSandbox
    /// (scene-name gate — the established dev-script convention; GymSub bakes no WaveDirector, so this is the
    /// sandbox's enemy source by design). The dummy is a real enemy ghost instantiated from a baked prefab
    /// (grunt-shaped preferred), parked at the first player's position + a fixed offset, HP fat enough to eat a
    /// few chains; it dies through the NORMAL death path (Dying corpse window → destroy → kill pop on the client)
    /// and respawns at the same anchor shortly after — kill feedback stays testable on repeat. Editor-only.
    /// </summary>
    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
    public partial class TargetDummySpawnSystem : SystemBase
    {
        const float RespawnDelaySec = 1.5f;
        const float DummyHealth = 400f;
        static readonly float3 AnchorOffset = new float3(3f, 0f, 1.5f);

        float _respawnTimer;
        float3 _anchor;
        bool _anchored;

        protected override void OnUpdate()
        {
            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "DevSandbox")
                return;

            // A dummy exists (alive OR in its Dying corpse window) -> nothing to do; the corpse window
            // conveniently delays the respawn timer until the body is gone.
            var dummyQ = SystemAPI.QueryBuilder().WithAll<TargetDummyTag>().Build();
            if (!dummyQ.IsEmpty) { _respawnTimer = 0f; return; }

            // Anchor once on the first player seen (spawn point + offset = a consistent training spot).
            if (!_anchored)
            {
                foreach (var xf in SystemAPI.Query<RefRO<LocalTransform>>().WithAll<PlayerTag>())
                {
                    _anchor = xf.ValueRO.Position + AnchorOffset;
                    _anchored = true;
                    break;
                }
                if (!_anchored) return; // no player yet (world still connecting)
            }

            _respawnTimer += SystemAPI.Time.DeltaTime; // wall-frame is fine: dev spawner in the plain server group
            if (_respawnTimer < RespawnDelaySec) return;
            _respawnTimer = 0f;

            // Grunt-shaped prefab preferred (no lunge/spit machinery on a training dummy); fall back to any enemy.
            var prefQ = EntityManager.CreateEntityQuery(new EntityQueryDesc
            {
                All = new ComponentType[] { typeof(EnemyTag), typeof(Prefab) },
                None = new ComponentType[] { typeof(LungeState), typeof(SpitterState) },
                Options = EntityQueryOptions.IncludePrefab,
            });
            var prefabs = prefQ.ToEntityArray(Allocator.Temp);
            if (prefabs.Length == 0)
            {
                prefabs.Dispose();
                var anyQ = EntityManager.CreateEntityQuery(new EntityQueryDesc
                {
                    All = new ComponentType[] { typeof(EnemyTag), typeof(Prefab) },
                    Options = EntityQueryOptions.IncludePrefab,
                });
                prefabs = anyQ.ToEntityArray(Allocator.Temp);
                if (prefabs.Length == 0) { prefabs.Dispose(); return; } // no enemy ghosts in this world
            }
            var prefab = prefabs[0];
            prefabs.Dispose();

            var inst = EntityManager.Instantiate(prefab);
            var baked = EntityManager.GetComponentData<LocalTransform>(prefab);
            EntityManager.SetComponentData(inst, baked.WithPosition(_anchor)); // WithPosition: never FromPosition (Scale reset)
            EntityManager.SetComponentData(inst, new Health { Current = DummyHealth, Max = DummyHealth });
            EntityManager.AddComponent<TargetDummyTag>(inst); // server-only: plants it (every AI pass excludes the tag)
        }
    }
}
#endif