#if UNITY_EDITOR
using System.Collections.Generic;
using System.Text;
using ProjectM.Simulation;
using Unity.Collections;
using Unity.Entities;
using Unity.Mathematics;
using Unity.NetCode;
using Unity.Transforms;
using UnityEngine;

namespace ProjectM.Client
{
    /// <summary>
    /// 07-20 data-driven tuning: a MEASUREMENT probe for melee feel. In Play, spawns a huge-HP dummy in front of
    /// the local player, holds the (injected) Attack for a scripted chain, and samples the SERVER truth every
    /// editor frame: swing-start ticks, scheduled contact ticks, actual damage ticks + amounts. The report is
    /// MEASURED cadence / contact latency / DPS / buffer usage — objective numbers to tune against instead of
    /// eyeballs, valid under real tick-batching. Editor-only diagnostics (cross-world reads); drive from the
    /// DebugOverlay button or execute_code: <c>ProjectM.Client.CombatProbe.Run(6);</c>, read the console.
    /// </summary>
    public static class CombatProbe
    {
        public static bool Running { get; private set; }

        struct SwingRec { public uint Start; public uint Scheduled; public uint DamageTickObserved; public float Damage; }

        public static void Run(int swings = 6, float aimX = 1f, float aimZ = 0f)
        {
            if (!Application.isPlaying) { Debug.LogWarning("[CombatProbe] Play mode only."); return; }
            if (Running) { Debug.LogWarning("[CombatProbe] Already running."); return; }

            World server = null;
            foreach (var w in World.All) if (w.Name == "ServerWorld") server = w;
            if (server == null) { Debug.LogWarning("[CombatProbe] No ServerWorld."); return; }
            var sem = server.EntityManager;

            // The local player's server twin (the entity that carries the scheduled-cleave slot).
            var pq = sem.CreateEntityQuery(typeof(MeleeCleavePending), typeof(MeleeCombo), typeof(LocalTransform));
            var players = pq.ToEntityArray(Allocator.Temp);
            if (players.Length == 0) { players.Dispose(); Debug.LogWarning("[CombatProbe] No server player."); return; }
            var player = players[0];
            players.Dispose();
            var playerPos = sem.GetComponentData<LocalTransform>(player).Position;

            // Dummy: any enemy prefab, parked inside the cone, HP no swing chain can finish.
            var prefQ = sem.CreateEntityQuery(new EntityQueryDesc
            {
                All = new ComponentType[] { typeof(EnemyTag), typeof(Prefab) },
                Options = EntityQueryOptions.IncludePrefab,
            });
            var prefabs = prefQ.ToEntityArray(Allocator.Temp);
            if (prefabs.Length == 0) { prefabs.Dispose(); Debug.LogWarning("[CombatProbe] No enemy prefab."); return; }
            var dummy = sem.Instantiate(prefabs[0]);
            prefabs.Dispose();
            var baked = sem.GetComponentData<LocalTransform>(dummy);
            var aim = math.normalizesafe(new float2(aimX, aimZ), new float2(1f, 0f));
            sem.SetComponentData(dummy, baked.WithPosition(playerPos + new float3(aim.x, 0f, aim.y) * 1.6f));
            sem.SetComponentData(dummy, new Health { Current = 100000f, Max = 100000f });

            Running = true;
            int frame = 0;
            var recs = new List<SwingRec>();
            uint lastSwing = 0; float lastHp = 100000f; int buffered = 0; uint firstTick = 0, lastTick = 0;
            UnityEditor.EditorApplication.CallbackFunction cb = null;
            cb = () =>
            {
                try
                {
                    frame++;
                    World sw = null;
                    foreach (var w2 in World.All) if (w2.Name == "ServerWorld") sw = w2;
                    if (sw == null) { Finish("server world gone"); return; }
                    var em = sw.EntityManager;
                    if (!em.Exists(player) || !em.Exists(dummy)) { Finish("probe entity despawned"); return; }

                    uint tick = 0;
                    var ntq = em.CreateEntityQuery(typeof(NetworkTime));
                    if (!ntq.IsEmpty) { var nt = ntq.GetSingleton<NetworkTime>(); if (nt.ServerTick.IsValid) tick = nt.ServerTick.TickIndexForValidTick; }
                    if (firstTick == 0) firstTick = tick;
                    lastTick = tick;

                    var mc = em.GetComponentData<MeleeCombo>(player);
                    var pend = em.GetComponentData<MeleeCleavePending>(player);
                    float hp = em.GetComponentData<Health>(dummy).Current;

                    if (mc.SwingStartTick != 0 && mc.SwingStartTick != lastSwing)
                    {
                        recs.Add(new SwingRec { Start = mc.SwingStartTick, Scheduled = pend.ResolveTick });
                        lastSwing = mc.SwingStartTick;
                    }
                    else if (recs.Count > 0 && pend.ResolveTick != 0)
                    {
                        var r0 = recs[recs.Count - 1];
                        if (r0.Scheduled == 0) { r0.Scheduled = pend.ResolveTick; recs[recs.Count - 1] = r0; }
                    }
                    if (hp < lastHp && recs.Count > 0)
                    {
                        var r1 = recs[recs.Count - 1];
                        if (r1.DamageTickObserved == 0) { r1.DamageTickObserved = tick; r1.Damage = lastHp - hp; recs[recs.Count - 1] = r1; }
                    }
                    if (mc.BufferedAttackTick != 0) buffered++; // frames a buffer was armed (usage signal)
                    lastHp = hp;

                    // Drive: hold the attack (re-issued) until the target swing count is reached — a mashing player.
                    if (recs.Count < swings) { DebugInputInjectionSystem.SetAim(aim.x, aim.y); DebugInputInjectionSystem.Attack(3); }

                    bool lastResolved = recs.Count == 0 || recs[recs.Count - 1].DamageTickObserved != 0; // wait for the FINAL contact (a whiff falls through to the timeout)
                    if ((recs.Count >= swings && lastResolved) || frame > 900) Finish(null);
                }
                catch (System.Exception ex) { Finish("exception: " + ex.Message); }
            };
            UnityEditor.EditorApplication.update += cb;
            Debug.Log($"[CombatProbe] Running: {swings} swings vs a 100k-HP dummy at +{1.6f:F1}m (aim {aim.x:F1},{aim.y:F1}).");

            void Finish(string abort)
            {
                UnityEditor.EditorApplication.update -= cb;
                DebugInputInjectionSystem.Stop();
                Running = false;
                World sw2 = null;
                foreach (var w3 in World.All) if (w3.Name == "ServerWorld") sw2 = w3;
                if (sw2 != null && sw2.EntityManager.Exists(dummy)) sw2.EntityManager.DestroyEntity(dummy);

                var sb = new StringBuilder();
                sb.AppendLine("==== COMBAT PROBE REPORT (server-measured) ====");
                if (abort != null) sb.AppendLine("  ABORTED: " + abort);
                float totalDmg = 0f;
                for (int i = 0; i < recs.Count; i++)
                {
                    var r = recs[i];
                    long contact = r.Scheduled != 0 ? (long)r.Scheduled - r.Start : -1;
                    long observed = r.DamageTickObserved != 0 ? (long)r.DamageTickObserved - r.Start : -1;
                    long gap = i > 0 ? (long)r.Start - recs[i - 1].Start : 0;
                    totalDmg += r.Damage;
                    sb.AppendLine($"  swing {i + 1}: start {r.Start}"
                        + (i > 0 ? $" (gap {gap}t = {gap / 60f:F2}s)" : "")
                        + $" | scheduled contact +{contact}t | damage {r.Damage:F0} observed +{observed}t (frame-sampled)");
                }
                if (recs.Count > 1)
                {
                    float span = (recs[recs.Count - 1].Start - recs[0].Start) / 60f;
                    sb.AppendLine($"  MEASURED cadence: {span / (recs.Count - 1):F2}s/swing over {recs.Count} swings");
                }
                float dur = (lastTick - firstTick) / 60f;
                if (dur > 0.5f) sb.AppendLine($"  MEASURED DPS vs dummy: {totalDmg / dur:F1} over {dur:F1}s (total {totalDmg:F0})");
                sb.AppendLine($"  buffer armed on {buffered} sampled frames (mashing exercises the unlock-edge path)");
                Debug.Log(sb.ToString());
            }
        }
    }
}
#endif