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

namespace ProjectM.Server
{
    /// <summary>
    /// EDITOR-ONLY server receiver for <see cref="DebugCommandRequest"/> dev-tool RPCs (from the DebugOverlay or
    /// execute_code). Applies authoritative effects so the dev buttons exercise the REAL server paths and work
    /// over a live connection too: force/stop waves, clear enemies, grant resources/upgrades, teleport, god-mode,
    /// heal/kill, class swap, gym enemy spawns. Sender-targeted ops resolve the player via SourceConnection ->
    /// NetworkId -> GhostOwner (the RegionTransitSystem pattern). Plain server SimulationSystemGroup (NOT the
    /// predicted loop). The whole system is #if UNITY_EDITOR (stripped from builds); the wire TYPE
    /// (<see cref="DebugCommandRequest"/>) is unconditional so the RPC collection hash matches across peers.
    /// Non-Burst (managed-simple, editor-only) — perf is irrelevant.
    /// </summary>
    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
    [UpdateInGroup(typeof(SimulationSystemGroup))]
    public partial struct DebugCommandReceiveSystem : ISystem
    {
        EntityQuery m_Husks;

        public void OnCreate(ref SystemState state)
        {
            m_Husks = state.GetEntityQuery(ComponentType.ReadOnly<EnemyTag>(), ComponentType.Exclude<Dying>()); // corpses expire on their own (B3; avoids a cross-ECB double-destroy)
            var builder = new EntityQueryBuilder(Allocator.Temp)
                .WithAll<DebugCommandRequest, ReceiveRpcCommandRequest>();
            state.RequireForUpdate(state.GetEntityQuery(builder));
        }

        public void OnUpdate(ref SystemState state)
        {
            var ecb = new EntityCommandBuffer(Allocator.Temp);

            // Connection NetworkId -> player entity (for sender-targeted ops).
            var playerByConn = new NativeHashMap<int, Entity>(8, Allocator.Temp);
            foreach (var (owner, e) in SystemAPI.Query<RefRO<GhostOwner>>().WithAll<PlayerTag>().WithEntityAccess())
                playerByConn[owner.ValueRO.NetworkId] = e;

            uint now = SystemAPI.TryGetSingleton<NetworkTime>(out var netTime) && netTime.ServerTick.IsValid
                ? netTime.ServerTick.TickIndexForValidTick : 0u;

            foreach (var (request, receive, reqEntity) in
                     SystemAPI.Query<RefRO<DebugCommandRequest>, RefRO<ReceiveRpcCommandRequest>>().WithEntityAccess())
            {
                var cmd = request.ValueRO;

                Entity sender = Entity.Null;
                var connEntity = receive.ValueRO.SourceConnection;
                PlayerResolve.TryResolve(ref state, playerByConn, connEntity, out sender);

                switch (cmd.Op)
                {
                    case DebugOp.SpawnWave: // re-meant (LANTERN): force the NEXT wave to start this tick
                        if (SystemAPI.TryGetSingletonEntity<WaveState>(out var forceWaveE))
                        {
                            var fw = SystemAPI.GetComponent<WaveState>(forceWaveE);
                            fw.Phase = WavePhase.Lull;
                            fw.NextActionTick = 0; // due immediately -> WaveSystem starts the next (bigger) wave
                            SystemAPI.SetComponent(forceWaveE, fw);
                        }
                        break;

                    case DebugOp.EndSiege: // re-meant (LANTERN): "quiet the arena" — cull husks + push the next wave far out
                        CullHusks(ref ecb);
                        if (SystemAPI.TryGetSingletonEntity<WaveState>(out var stopWaveE))
                        {
                            var w = SystemAPI.GetComponent<WaveState>(stopWaveE);
                            w.Phase = WavePhase.Lull;
                            w.RemainingToSpawn = 0;
                            w.NextActionTick = TickUtil.NonZero(now + 216000u); // ~1 h @ 60 Hz: waves stay quiet for the session
                            SystemAPI.SetComponent(stopWaveE, w);
                        }
                        break;


                    case DebugOp.ClearEnemies:
                        CullHusks(ref ecb);
                        break;

                    case DebugOp.GrantResource:
                        if (SystemAPI.TryGetSingletonEntity<ResourceLedger>(out var ledgerE))
                        {
                            var ledger = SystemAPI.GetBuffer<StorageEntry>(ledgerE);
                            StorageMath.Deposit(ledger, (ushort)cmd.ArgA, cmd.ArgB);
                        }
                        break;

                    case DebugOp.GrantUpgrade:
                        if (sender != Entity.Null && SystemAPI.HasBuffer<StatModifier>(sender))
                            GrowDamageModifier(SystemAPI.GetBuffer<StatModifier>(sender));
                        break;

                    case DebugOp.Teleport:
                        if (sender != Entity.Null && SystemAPI.HasComponent<RegionTag>(sender)
                                                  && SystemAPI.HasComponent<LocalTransform>(sender))
                        {
                            byte region = (byte)cmd.ArgA;
                            SystemAPI.GetComponentRW<RegionTag>(sender).ValueRW.Region = region;
                            float3 baseCenter = new float3(0f, 1f, 0f);
                            if (SystemAPI.TryGetSingleton<BaseAnchor>(out var anchor))
                                baseCenter = BaseGridMath.PlotCenter(anchor);
                            SystemAPI.GetComponentRW<LocalTransform>(sender).ValueRW.Position =
                                RegionMath.RegionOrigin(region, baseCenter);
                        }
                        break;

                    case DebugOp.ToggleGod:
                        if (sender != Entity.Null && SystemAPI.HasComponent<DebugGodMode>(sender))
                            SystemAPI.SetComponentEnabled<DebugGodMode>(sender, !SystemAPI.IsComponentEnabled<DebugGodMode>(sender));
                        break;

                    case DebugOp.Heal:
                        if (sender != Entity.Null && SystemAPI.HasComponent<Health>(sender))
                        {
                            var h = SystemAPI.GetComponent<Health>(sender);
                            h.Current = SystemAPI.HasComponent<EffectiveCharacterStats>(sender)
                                ? SystemAPI.GetComponent<EffectiveCharacterStats>(sender).MaxHealth
                                : h.Max;
                            SystemAPI.SetComponent(sender, h);
                        }
                        break;

                    case DebugOp.KillPlayer:
                        if (sender != Entity.Null && SystemAPI.HasComponent<Health>(sender))
                        {
                            var h = SystemAPI.GetComponent<Health>(sender);
                            h.Current = 0f;
                            SystemAPI.SetComponent(sender, h);
                        }
                        break;

                    case DebugOp.SetTuning:
                        if (SystemAPI.TryGetSingleton<TuningConfig>(out var tuningCfg))
                        {
                            TuningConfig.Apply(ref tuningCfg, (byte)cmd.ArgA, cmd.ArgB / 1000f);
                            SystemAPI.SetSingleton(tuningCfg);
                        }
                        break;
                    case DebugOp.SetClass:
                        // Swap an already-spawned player's frame IN PLACE (editor dev tool). Frame = FrameId + the
                        // ClassSourceId-tagged StatModifier seeds + the 4-socket Spark loadout; the owner's
                        // StatRecomputeSystem refolds EffectiveCharacterStats. Server-authoritative + prediction-
                        // correct (same buffer-mutation path as GrantUpgrade). The swap runs even on a corpse; the
                        // heal is gated on a LIVING player so we don't resurrect out-of-band and race
                        // PlayerRespawnSystem (which refills to the new max on respawn itself).
                        if (sender != Entity.Null && SystemAPI.HasBuffer<AbilitySocket>(sender)
                                                  && SystemAPI.HasBuffer<StatModifier>(sender))
                        {
                            var classMods = SystemAPI.GetBuffer<StatModifier>(sender);
                            Entity dir2 = Entity.Null;
                            bool haveMeta2 = SystemAPI.TryGetSingleton<MetaUpgradeCatalog>(out var metaCat2)
                                && SystemAPI.TryGetSingletonEntity<ResourceLedger>(out dir2) && SystemAPI.HasBuffer<MetaTierState>(dir2);
                            var metaRec2 = haveMeta2 ? SystemAPI.GetBuffer<MetaTierState>(dir2) : default;
                            // DR-046: the FULL swap (class seeds + meta re-sync) lives in the shared ClassSwapUtil,
                            // used by BOTH this dev path and the base ClassSelectReceiveSystem so they cannot drift.
                            ClassSwapUtil.Apply((byte)cmd.ArgA, classMods, haveMeta2, metaCat2, metaRec2,
                                out byte swNewClass);
                            if (SystemAPI.HasComponent<FrameId>(sender))
                                SystemAPI.SetComponent(sender, new FrameId { Value = swNewClass });
                            if (SystemAPI.HasComponent<PlayerClass>(sender))
                                SystemAPI.SetComponent(sender, new PlayerClass { ClassId = swNewClass });
                            ClassTraits.FrameLoadout(swNewClass, out byte sf0, out byte sf1, out byte sf2, out byte sf3);
                            var swSockets = SystemAPI.GetBuffer<AbilitySocket>(sender);
                            swSockets.Clear();
                            swSockets.Add(new AbilitySocket { SparkId = sf0 });
                            swSockets.Add(new AbilitySocket { SparkId = sf1 });
                            swSockets.Add(new AbilitySocket { SparkId = sf2 });
                            swSockets.Add(new AbilitySocket { SparkId = sf3 });
                            if (SystemAPI.HasComponent<SocketCooldown>(sender))
                                SystemAPI.SetComponent(sender, default(SocketCooldown));
                            if (SystemAPI.HasComponent<Health>(sender) && SystemAPI.HasComponent<CharacterStatsRef>(sender)
                                && SystemAPI.TryGetSingleton<AbilityDatabase>(out var abilityDb2))
                            {
                                byte charId2 = SystemAPI.GetComponent<CharacterStatsRef>(sender).Id;
                                if (abilityDb2.Value.Value.TryGetCharacter(charId2, out var baseChar2))
                                {
                                    var hp2 = SystemAPI.GetComponent<Health>(sender);
                                    ClassSwapUtil.HealClamp(ref hp2, baseChar2.MaxHealth, classMods);
                                    SystemAPI.SetComponent(sender, hp2);
                                }
                            }
                        }
                        break;
                        break;
                    case DebugOp.SpawnEnemy:
                        // GYM: spawn a chosen enemy KIND (Drowner/Grindylow) from the baked roster near the sender.
                        if (sender != Entity.Null && SystemAPI.HasComponent<LocalTransform>(sender)
                            && SystemAPI.TryGetSingletonEntity<GymTag>(out var gymEntity)
                            && SystemAPI.HasBuffer<GymEnemyRoster>(gymEntity))
                        {
                            var roster = SystemAPI.GetBuffer<GymEnemyRoster>(gymEntity);
                            Entity enemyPrefab = Entity.Null;
                            for (int r = 0; r < roster.Length; r++)
                                if (roster[r].Kind == (byte)cmd.ArgA) { enemyPrefab = roster[r].Prefab; break; }
                            if (enemyPrefab != Entity.Null)
                            {
                                var sPos = SystemAPI.GetComponent<LocalTransform>(sender).Position;
                                var bakedEnemyLt = state.EntityManager.GetComponentData<LocalTransform>(enemyPrefab);
                                int spawnCount = math.max(1, cmd.ArgB);
                                for (int k = 0; k < spawnCount; k++)
                                {
                                    float ang = k * 0.7f;
                                    float3 pos = sPos + new float3(math.cos(ang), 0f, math.sin(ang)) * 5f;
                                    pos.y = sPos.y;
                                    var enemy = ecb.Instantiate(enemyPrefab);
                                    ecb.SetComponent(enemy, bakedEnemyLt.WithPosition(pos));
                                    ecb.AddComponent(enemy, new RegionTag { Region = RegionId.Base });
                                }
                            }
                        }
                        break;
                }

                ecb.DestroyEntity(reqEntity);
            }

            ecb.Playback(state.EntityManager);
            ecb.Dispose();
            playerByConn.Dispose();
        }

        void CullHusks(ref EntityCommandBuffer ecb)
        {
            var husks = m_Husks.ToEntityArray(Allocator.Temp);
            for (int i = 0; i < husks.Length; i++)
                ecb.DestroyEntity(husks[i]);
            husks.Dispose();
        }

        static void GrowDamageModifier(DynamicBuffer<StatModifier> mods)
        {
            const uint debugSourceId = 0x00DEB061u; // distinct debug sentinel (replace-by-SourceId keeps it bounded)
            for (int i = 0; i < mods.Length; i++)
            {
                if (mods[i].SourceId == debugSourceId && mods[i].Target == (byte)StatTarget.Damage)
                {
                    var m = mods[i];
                    m.Value += 0.25f;
                    mods[i] = m;
                    return;
                }
            }
            mods.Add(new StatModifier
            {
                Target = (byte)StatTarget.Damage,
                Op = (byte)ModOp.PercentAdd,
                Value = 0.25f,
                SourceId = debugSourceId,
            });
        }
    }
}
#endif