using System;
using System.Collections.Generic;
using System.Reflection;
using UnityEditor;
using UnityEditor.Animations;
using UnityEngine;

namespace ProjectM.EditorTools
{
    /// <summary>
    /// Reusable editor pipeline that turns Synty Polygon character meshes into ANIMATED interpolated-ghost enemy
    /// prefabs, mirroring the DR-022 player-rig recipe so the same Rukhanka client-derived animation works for
    /// Husks (see DR-023). Three idempotent, re-runnable steps (menu: ProjectM/Animation):
    ///   1. Build deformation materials (duplicate the player's AnimatedLitShader mat, swap the pack atlas).
    ///   2. Build AC_EnemyTopDown (fork AC_PlayerTopDown + an Attack state) and the EnemyAttackWindup clip.
    ///   3. Build the 3 animated enemy prefabs (clone the capsule ghost template, strip the capsule, flatten the
    ///      Synty skeleton + SMRs under the ghost root, add Animator + RigDefinitionAuthoring, set the deformation
    ///      material, offset the Root bone for feet-on-ground).
    /// RigDefinitionAuthoring is set via reflection (no Rukhanka asmdef ref needed — same "by name" tactic as
    /// ServerStripAnimationSystem). Outputs are NEW prefabs (templates stay pristine capsules); re-point the
    /// gameplay subscene WaveDirector.EnemyPrefabs[] at them.
    /// </summary>
    public static class EnemyRigTools
    {
        const string PlayerMat        = "Assets/_Project/Materials/M_SpaceSoldier_Animated.mat";
        const string PlayerController  = "Assets/_Project/Animation/AC_PlayerTopDown.controller";
        const string EnemyController   = "Assets/_Project/Animation/AC_EnemyTopDown.controller";
        const string AttackClip        = "Assets/_Project/Animation/EnemyAttackWindup.anim";

        const string WerewolfAtlas = "Assets/Synty/PolygonWerewolf/Textures/PolygonWerewolf_01_A.png";
        const string KaijuAtlas    = "Assets/Synty/PolygonKaiju/Textures/PolygonKaiju_01.png";

        const string MatWerewolf       = "Assets/_Project/Materials/M_Enemy_Werewolf_Animated.mat";
        const string MatWerewolfUndead = "Assets/_Project/Materials/M_Enemy_WerewolfUndead_Animated.mat";
        const string MatKaiju          = "Assets/_Project/Materials/M_Enemy_Kaiju_Animated.mat";

        const string SyntyWerewolf = "Assets/Synty/PolygonWerewolf/Prefabs/Characters/SM_Chr_Werewolf_01.prefab";
        const string SyntyKaiju    = "Assets/Synty/PolygonKaiju/Prefabs/Characters/SM_Chr_Kaiju_01.prefab";

        // MC-1 Charger (SciFi-City Muscle — verified Generic rig, distinct charging silhouette; see Synty_Asset_Inventory).
        const string ChargerAtlas = "Assets/Synty/PolygonSciFiCity/Textures/Alts/PolygonScifi_01_A.png";
        const string MatCharger   = "Assets/_Project/Materials/M_Enemy_Charger_Animated.mat";
        const string SyntyMuscle  = "Assets/Synty/PolygonSciFiCity/Prefabs/Characters/SM_Chr_Muscle_Male_01.prefab";

        struct Variant
        {
            public string Name, Template, Synty, Output, Material;
            public float RootY;   // Root-bone local Y (capsule-center -> feet; tuned per scale in Play)
            public float Scale;   // 0 = keep the template's baked scale
        }

        static Variant[] Variants() => new[]
        {
            new Variant { Name = "Grunt (Werewolf)",          Template = "Assets/_Project/Prefabs/Enemy.prefab",        Synty = SyntyWerewolf, Output = "Assets/_Project/Prefabs/EnemyWerewolf.prefab",        Material = MatWerewolf,       RootY = -1.25f, Scale = 0f },
            new Variant { Name = "Swarmer (Werewolf Undead)", Template = "Assets/_Project/Prefabs/EnemySwarmer.prefab", Synty = SyntyWerewolf, Output = "Assets/_Project/Prefabs/EnemyWerewolfUndead.prefab", Material = MatWerewolfUndead, RootY = -1.67f, Scale = 0f },
            new Variant { Name = "Brute (Kaiju)",             Template = "Assets/_Project/Prefabs/EnemyBrute.prefab",   Synty = SyntyKaiju,    Output = "Assets/_Project/Prefabs/EnemyKaiju.prefab",          Material = MatKaiju,          RootY = -0.52f, Scale = 0f },
            ChargerVariant(),
        };

        /// <summary>MC-1 Charger: SciFi-City Muscle silhouette via the standard DR-023 pipeline (the inventory's prescribed next-faction path). Template scale 1.0 -> RootY -1.0 (humanoid -1/scale rule); fine-tune feet in Play.</summary>
        static Variant ChargerVariant() => new Variant { Name = "Charger (SciFi Muscle)", Template = "Assets/_Project/Prefabs/EnemyCharger.prefab", Synty = SyntyMuscle, Output = "Assets/_Project/Prefabs/EnemyChargerMuscle.prefab", Material = MatCharger, RootY = -1.00f, Scale = 0f };

        [MenuItem("ProjectM/Animation/Enemy Rigs - Build All")]
        public static void BuildAll()
        {
            BuildMaterials();
            BuildControllerAndClip();
            BuildPrefabs();
            Debug.Log("[EnemyRigTools] Build All complete. Re-point WaveDirector.EnemyPrefabs[] at the new prefabs and re-bake the gameplay subscene.");
        }

        /// <summary>MC-1: build ONLY the Charger material + prefab (leaves the committed Werewolf/Kaiju outputs untouched).</summary>
        [MenuItem("ProjectM/Animation/Enemy Rigs - Build Charger (MC-1)")]
        public static void BuildCharger()
        {
            MakeMat(MatCharger, ChargerAtlas, new Color(1f, 0.42f, 0.36f, 1f)); // red-shifted SciFi atlas = danger read
            AssetDatabase.SaveAssets();
            BuildOne(ChargerVariant());
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log("[EnemyRigTools] Charger built -> EnemyChargerMuscle.prefab; add it to WaveDirector.EnemyPrefabs[] in the gameplay subscene.");
        }

        // ---- 1. Materials ------------------------------------------------------------------------------------

        [MenuItem("ProjectM/Animation/Enemy Rigs - 1 Build Materials")]
        public static void BuildMaterials()
        {
            MakeMat(MatWerewolf,       WerewolfAtlas, null);
            // Undead = the same werewolf atlas with a sickly desaturated-green tint so the Swarmer reads distinct.
            MakeMat(MatWerewolfUndead, WerewolfAtlas, new Color(0.62f, 0.78f, 0.55f, 1f));
            MakeMat(MatKaiju,          KaijuAtlas,    null);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log("[EnemyRigTools] Materials built.");
        }

        static void MakeMat(string dst, string atlas, Color? tint)
        {
            if (AssetDatabase.LoadAssetAtPath<Material>(PlayerMat) == null)
            { Debug.LogError($"[EnemyRigTools] Source material missing: {PlayerMat}"); return; }

            AssetDatabase.DeleteAsset(dst);
            if (!AssetDatabase.CopyAsset(PlayerMat, dst))
            { Debug.LogError($"[EnemyRigTools] CopyAsset failed -> {dst}"); return; }
            AssetDatabase.ImportAsset(dst);

            var m = AssetDatabase.LoadAssetAtPath<Material>(dst);
            var tex = AssetDatabase.LoadAssetAtPath<Texture>(atlas);
            if (tex == null) Debug.LogWarning($"[EnemyRigTools] Atlas not found: {atlas}");
            if (m.HasProperty("_BaseColorMap") && tex != null) m.SetTexture("_BaseColorMap", tex);
            if (tint.HasValue && m.HasProperty("_BaseColor")) m.SetColor("_BaseColor", tint.Value);
            EditorUtility.SetDirty(m);
        }

        // ---- 2. Controller + attack clip --------------------------------------------------------------------

        [MenuItem("ProjectM/Animation/Enemy Rigs - 2 Build Controller")]
        public static void BuildControllerAndClip()
        {
            // Attack wind-up: pitch the Root bone forward (whole-body lunge) and back, non-looping. Root is the
            // top of every Synty Generic rig, so one clip fits all variants; the locomotion clips don't key Root,
            // so no conflict and Root returns to its authored Y-offset when the state exits.
            var clip = new AnimationClip { frameRate = 30f };
            var pitch = new AnimationCurve(new Keyframe(0f, 0f), new Keyframe(0.15f, 30f), new Keyframe(0.40f, 0f));
            AnimationUtility.SetEditorCurve(clip, EditorCurveBinding.FloatCurve("Root", typeof(Transform), "localEulerAnglesRaw.x"), pitch);
            var s = AnimationUtility.GetAnimationClipSettings(clip);
            s.loopTime = false;
            AnimationUtility.SetAnimationClipSettings(clip, s);
            AssetDatabase.DeleteAsset(AttackClip);
            AssetDatabase.CreateAsset(clip, AttackClip);
            AssetDatabase.SaveAssets();

            if (AssetDatabase.LoadAssetAtPath<AnimatorController>(PlayerController) == null)
            { Debug.LogError($"[EnemyRigTools] Source controller missing: {PlayerController}"); return; }

            AssetDatabase.DeleteAsset(EnemyController);
            AssetDatabase.CopyAsset(PlayerController, EnemyController);
            AssetDatabase.ImportAsset(EnemyController);
            var ac = AssetDatabase.LoadAssetAtPath<AnimatorController>(EnemyController);

            if (!HasParam(ac, "IsAttacking"))
                ac.AddParameter("IsAttacking", AnimatorControllerParameterType.Bool);

            var sm = ac.layers[0].stateMachine;
            var attackClipAsset = AssetDatabase.LoadAssetAtPath<AnimationClip>(AttackClip);
            var attack = sm.AddState("Attack");
            attack.motion = attackClipAsset;
            attack.writeDefaultValues = false; // partial (Root-only) clip: MUST be false, else WDV resets every un-keyed bone (Hips/Spine/legs) to identity and the body collapses into the floor

            var toAttack = sm.AddAnyStateTransition(attack);
            toAttack.hasExitTime = false;
            toAttack.duration = 0.06f;
            toAttack.canTransitionToSelf = false;
            toAttack.AddCondition(AnimatorConditionMode.If, 0f, "IsAttacking");

            var fromAttack = attack.AddExitTransition();
            fromAttack.hasExitTime = false;
            fromAttack.duration = 0.12f;
            fromAttack.AddCondition(AnimatorConditionMode.IfNot, 0f, "IsAttacking");

            EditorUtility.SetDirty(ac);
            AssetDatabase.SaveAssets();
            Debug.Log("[EnemyRigTools] AC_EnemyTopDown + EnemyAttackWindup clip built.");
        }

        static bool HasParam(AnimatorController ac, string name)
        {
            foreach (var p in ac.parameters) if (p.name == name) return true;
            return false;
        }

        // ---- 3. Prefabs --------------------------------------------------------------------------------------

        [MenuItem("ProjectM/Animation/Enemy Rigs - 3 Build Prefabs")]
        public static void BuildPrefabs()
        {
            foreach (var v in Variants()) BuildOne(v);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log("[EnemyRigTools] Animated enemy prefabs built. Re-point WaveDirector.EnemyPrefabs[] and re-bake.");
        }

        static void BuildOne(Variant v)
        {
            if (AssetDatabase.LoadAssetAtPath<GameObject>(v.Template) == null)
            { Debug.LogError($"[EnemyRigTools] Template missing: {v.Template}"); return; }
            if (AssetDatabase.LoadAssetAtPath<GameObject>(v.Synty) == null)
            { Debug.LogError($"[EnemyRigTools] Synty char prefab missing: {v.Synty}"); return; }

            // GUID-preserving: COPY the template only on the FIRST build (mints the output + its GUID). On a
            // re-run, modify the existing output IN PLACE so its GUID stays stable -> the gameplay subscene's
            // WaveDirector.EnemyPrefabs[] references never break. (DeleteAsset+CopyAsset would mint a new GUID
            // each run and silently orphan those refs.)
            if (AssetDatabase.LoadAssetAtPath<GameObject>(v.Output) == null)
            {
                if (!AssetDatabase.CopyAsset(v.Template, v.Output))
                { Debug.LogError($"[EnemyRigTools] CopyAsset failed -> {v.Output}"); return; }
                AssetDatabase.ImportAsset(v.Output);
            }

            var root = PrefabUtility.LoadPrefabContents(v.Output);
            try
            {
                // Clean slate for idempotent re-runs: drop any previously-built rig (children + rig components)
                // and the primitive capsule visual; keep the root's ghost/authoring components + transform.
                var kids = new List<Transform>();
                foreach (Transform c in root.transform) kids.Add(c);
                foreach (var c in kids) UnityEngine.Object.DestroyImmediate(c.gameObject);
                foreach (var mf in root.GetComponents<MeshFilter>()) UnityEngine.Object.DestroyImmediate(mf);
                foreach (var mr in root.GetComponents<MeshRenderer>()) UnityEngine.Object.DestroyImmediate(mr);
                foreach (var an in root.GetComponents<Animator>()) UnityEngine.Object.DestroyImmediate(an);
                var oldRda = FindType("Rukhanka.Hybrid.RigDefinitionAuthoring");
                if (oldRda != null) { var ex = root.GetComponent(oldRda); if (ex != null) UnityEngine.Object.DestroyImmediate(ex); }

                // Optional scale override (else keep the template's baked variant scale).
                if (v.Scale > 0f) root.transform.localScale = new Vector3(v.Scale, v.Scale, v.Scale);

                // Clone the Synty character (unlinked) and flatten its skeleton + SMRs under the ghost root.
                var syntyAsset = AssetDatabase.LoadAssetAtPath<GameObject>(v.Synty);
                var clone = (GameObject)UnityEngine.Object.Instantiate(syntyAsset);
                var srcAnimator = clone.GetComponentInChildren<Animator>();
                var avatar = srcAnimator != null ? srcAnimator.avatar : null;

                var children = new List<Transform>();
                foreach (Transform c in clone.transform) children.Add(c);
                foreach (var c in children) c.SetParent(root.transform, false); // keep local transforms
                UnityEngine.Object.DestroyImmediate(clone);

                // Feet-on-ground: offset the un-keyed Root bone (entity origin = capsule center ~1m up).
                var rootBone = root.transform.Find("Root");
                if (rootBone != null)
                {
                    var lp = rootBone.localPosition;
                    lp.y = v.RootY;
                    rootBone.localPosition = lp;
                }
                else Debug.LogWarning($"[EnemyRigTools] No 'Root' bone under {v.Output}; feet offset skipped.");

                // Deformation material on every SMR slot (else unskinned-static + "does not support skinning").
                var mat = AssetDatabase.LoadAssetAtPath<Material>(v.Material);
                if (mat == null) Debug.LogWarning($"[EnemyRigTools] Material missing: {v.Material}");
                foreach (var smr in root.GetComponentsInChildren<SkinnedMeshRenderer>(true))
                {
                    var mats = smr.sharedMaterials;
                    for (int i = 0; i < mats.Length; i++) mats[i] = mat;
                    smr.sharedMaterials = mats;
                }

                // Animator on the ghost root (the entity that holds EnemyAuthoring + the Rukhanka param buffer).
                var anim = root.GetComponent<Animator>();
                if (anim == null) anim = root.AddComponent<Animator>();
                anim.avatar = avatar;
                anim.runtimeAnimatorController = AssetDatabase.LoadAssetAtPath<RuntimeAnimatorController>(EnemyController);
                anim.applyRootMotion = false;

                // RigDefinitionAuthoring (Rukhanka.Hybrid) via reflection — CPU engine, match the player rig.
                AddRigDefinition(root);

                PrefabUtility.SaveAsPrefabAsset(root, v.Output);
                Debug.Log($"[EnemyRigTools] Built {v.Name} -> {v.Output} (rootY={v.RootY}).");
            }
            finally
            {
                PrefabUtility.UnloadPrefabContents(root);
            }
        }

        static void AddRigDefinition(GameObject root)
        {
            var t = FindType("Rukhanka.Hybrid.RigDefinitionAuthoring");
            if (t == null) { Debug.LogError("[EnemyRigTools] RigDefinitionAuthoring type not found (Rukhanka.Hybrid)."); return; }
            var rda = root.GetComponent(t);
            if (rda == null) rda = root.AddComponent(t);
            SetMember(rda, "applyRootMotion", false);
            SetMember(rda, "boneEntityStrippingMode", 1); // match Player.prefab
            SetMember(rda, "animationEngine", 0);          // 0 = CPU
            EditorUtility.SetDirty(rda);
        }

        static Type FindType(string fullName)
        {
            foreach (var asm in AppDomain.CurrentDomain.GetAssemblies())
            {
                var t = asm.GetType(fullName);
                if (t != null) return t;
            }
            return null;
        }

        static void SetMember(object o, string name, object val)
        {
            const BindingFlags BF = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
            var f = o.GetType().GetField(name, BF);
            if (f != null)
            {
                object v = f.FieldType.IsEnum ? Enum.ToObject(f.FieldType, Convert.ToInt32(val))
                                              : Convert.ChangeType(val, f.FieldType);
                f.SetValue(o, v);
                return;
            }
            var p = o.GetType().GetProperty(name, BF);
            if (p != null && p.CanWrite)
            {
                object v = p.PropertyType.IsEnum ? Enum.ToObject(p.PropertyType, Convert.ToInt32(val))
                                                 : Convert.ChangeType(val, p.PropertyType);
                p.SetValue(o, v);
                return;
            }
            Debug.LogWarning($"[EnemyRigTools] Field/prop '{name}' not found on {o.GetType().Name}.");
        }
    }
}