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

public class FoldEditorWindow : EditorWindow
{
    [SerializeField] Material targetMaterial;
    [SerializeField] Vector2 scrollPos;
    [SerializeReference] List<DeformOperation> operations = new();
    [SerializeField] List<int> expandedOps = new();
    [SerializeField] GameObject targetObject;
    int frameStep;
    bool wasInAnimationMode;
    float lastAnimTime = -1f;
    bool isRecording;

    const string FrameStepPrefKey = "Fold_FrameStep";

    static Type s_animWindowType;
    static PropertyInfo s_clipProp, s_timeProp;

    static class Styles
    {
        public static GUIStyle card;
        public static GUIStyle cardHeader;
        public static GUIStyle cardBody;
        public static GUIStyle miniButtonLeft;
        public static GUIStyle miniButtonMid;
        public static GUIStyle miniButtonRight;
        public static GUIStyle footerButton;

        public static GUIContent iconUp;
        public static GUIContent iconDown;
        public static GUIContent iconRemove;
        public static GUIContent iconAdd;
        public static GUIContent iconKey;
        public static GUIContent iconRead;
        public static GUIContent iconDeleteKey;
        public static GUIContent iconClear;
        public static GUIContent iconPrev;
        public static GUIContent iconNext;

        public static void Init()
        {
            if (card != null) return;

            card = new GUIStyle(EditorStyles.helpBox);
            card.padding = new RectOffset(1, 1, 1, 1);
            card.margin = new RectOffset(4, 4, 4, 4);

            cardHeader = new GUIStyle(EditorStyles.toolbar);
            cardHeader.fontStyle = FontStyle.Bold;
            cardHeader.alignment = TextAnchor.MiddleLeft;
            cardHeader.padding = new RectOffset(5, 5, 0, 0);
            cardHeader.fixedHeight = 24;

            cardBody = new GUIStyle(EditorStyles.inspectorDefaultMargins);
            cardBody.padding = new RectOffset(10, 10, 10, 10);

            miniButtonLeft = EditorStyles.miniButtonLeft;
            miniButtonMid = EditorStyles.miniButtonMid;
            miniButtonRight = EditorStyles.miniButtonRight;

            footerButton = new GUIStyle(EditorStyles.miniButton);
            footerButton.fixedHeight = 24;
            footerButton.fixedWidth = 32;

            iconUp        = EditorGUIUtility.IconContent("d_scrollup@2x");
            iconDown      = EditorGUIUtility.IconContent("d_scrolldown@2x");
            iconRemove    = EditorGUIUtility.IconContent("TreeEditor.Trash");
            iconAdd       = EditorGUIUtility.IconContent("Toolbar Plus");
            iconKey       = EditorGUIUtility.IconContent("Animation.Record");
            iconRead      = EditorGUIUtility.IconContent("d_Import");
            iconDeleteKey = EditorGUIUtility.IconContent("d_Toolbar Minus");
            iconClear     = EditorGUIUtility.IconContent("TreeEditor.Trash");
            iconPrev      = EditorGUIUtility.IconContent("Animation.PrevKey");
            iconNext      = EditorGUIUtility.IconContent("Animation.NextKey");

            if (iconUp.image == null)        iconUp.text = "▲";
            if (iconDown.image == null)      iconDown.text = "▼";
            if (iconKey.image == null)       iconKey.text = "Rec";
            if (iconRead.image == null)      iconRead.text = "Load";
            if (iconDeleteKey.image == null) iconDeleteKey.text = "-";
        }
    }

    static void CacheAnimWindowReflection()
    {
        if (s_animWindowType != null) return;
        s_animWindowType = typeof(EditorWindow).Assembly.GetType("UnityEditor.AnimationWindow");
        const BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
        s_clipProp = s_animWindowType?.GetProperty("animationClip", flags);
        s_timeProp = s_animWindowType?.GetProperty("time", flags);
    }

    [MenuItem("Tools/yum_food/Fold")]
    static void ShowWindow()
    {
        var window = GetWindow<FoldEditorWindow>("Fold");
        window.minSize = new Vector2(350, 400);
    }

    void OnEnable()
    {
        frameStep = EditorPrefs.GetInt(FrameStepPrefKey, 1);
        EditorApplication.update += OnEditorUpdate;
    }

    void OnDisable()
    {
        EditorApplication.update -= OnEditorUpdate;
        EditorPrefs.SetInt(FrameStepPrefKey, frameStep);
        ClearPropertyBlock();
    }

    void OnEditorUpdate()
    {
        if (isRecording) return;

        if (!AnimationMode.InAnimationMode() || targetMaterial == null)
        {
            lastAnimTime = -1f;
            return;
        }

        if (!TryGetAnimationWindowState(out var clip, out float time)) return;

        if (!Mathf.Approximately(time, lastAnimTime))
        {
            lastAnimTime = time;
            LoadFromClipPreservingExpanded(clip, time);
            Repaint();
        }
    }

    void OnGUI()
    {
        Styles.Init();

        bool inAnimMode = AnimationMode.InAnimationMode();
        if (wasInAnimationMode && !inAnimMode)
            ClearPropertyBlock();
        wasInAnimationMode = inAnimMode;

        EditorGUILayout.Space(5);
        DrawHeader();
        EditorGUILayout.Space(5);

        if (targetMaterial == null)
        {
            EditorGUILayout.HelpBox("Select a material to build deformation pipelines", MessageType.Info);
            return;
        }

        DrawToolbar();

        EditorGUI.BeginChangeCheck();
        scrollPos = EditorGUILayout.BeginScrollView(scrollPos);
        DrawOperationsList();
        EditorGUILayout.EndScrollView();
        if (EditorGUI.EndChangeCheck() && targetMaterial != null)
            ApplyToMaterial();

        DrawFooter();
        EditorGUILayout.Space(5);
    }

    void DrawHeader()
    {
        EditorGUILayout.BeginVertical(EditorStyles.inspectorDefaultMargins);

        EditorGUILayout.BeginHorizontal();
        EditorGUILayout.LabelField("Target Material", EditorStyles.boldLabel, GUILayout.Width(100));
        var newMat = EditorGUILayout.ObjectField(targetMaterial, typeof(Material), false) as Material;
        if (newMat != targetMaterial)
        {
            targetMaterial = newMat;
            if (targetMaterial != null)
                LoadFromMaterial();
        }
        EditorGUILayout.EndHorizontal();

        EditorGUILayout.BeginHorizontal();
        EditorGUILayout.LabelField("Target Object", EditorStyles.boldLabel, GUILayout.Width(100));
        targetObject = EditorGUILayout.ObjectField(targetObject, typeof(GameObject), true) as GameObject;
        EditorGUILayout.EndHorizontal();

        EditorGUILayout.EndVertical();
    }

    void DrawToolbar()
    {
        EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);

        bool pipelineFull = operations.Count >= 16;
        using (new EditorGUI.DisabledScope(pipelineFull))
        {
            var content = pipelineFull
                ? new GUIContent("Add Operation (Full)", "Pipeline full (16/16)")
                : new GUIContent(" Add Operation", Styles.iconAdd.image);
            if (GUILayout.Button(content, EditorStyles.toolbarDropDown, GUILayout.Width(130)))
                ShowAddOperationMenu();
        }

        GUILayout.FlexibleSpace();
        EditorGUILayout.EndHorizontal();
    }

    void DrawOperationsList()
    {
        if (operations.Count == 0)
        {
            GUILayout.BeginVertical(Styles.card);
            GUILayout.Label("Pipeline is empty.", EditorStyles.centeredGreyMiniLabel);
            GUILayout.EndVertical();
            return;
        }

        for (int i = 0; i < operations.Count; i++)
            DrawOperation(i);
    }

    void DrawOperation(int index)
    {
        var op = operations[index];
        bool isExpanded = expandedOps.Contains(index);

        var defaultColor = GUI.backgroundColor;
        if (isExpanded) GUI.backgroundColor = new Color(0.9f, 0.95f, 1f);

        EditorGUILayout.BeginVertical(Styles.card);
        GUI.backgroundColor = defaultColor;

        Rect headerRect = EditorGUILayout.GetControlRect(false, 24);
        if (Event.current.type == EventType.Repaint)
            Styles.cardHeader.Draw(headerRect, GUIContent.none, false, false, false, false);

        float btnWidth = 24, btnHeight = 18;
        float btnY = headerRect.y + (headerRect.height - btnHeight) / 2;
        float rightX = headerRect.xMax - 5;

        Rect removeRect = new Rect(rightX - btnWidth,       btnY, btnWidth, btnHeight);
        Rect downRect   = new Rect(removeRect.x - btnWidth, btnY, btnWidth, btnHeight);
        Rect upRect     = new Rect(downRect.x - btnWidth,   btnY, btnWidth, btnHeight);

        Rect arrowRect = new Rect(headerRect.x + 5,  headerRect.y + 4, 15, 16);
        Rect indexRect = new Rect(headerRect.x + 20, headerRect.y + 4, 30, 16);
        Rect labelRect = new Rect(headerRect.x + 50, headerRect.y + 4, upRect.x - (headerRect.x + 50), 16);
        Rect clickRect = new Rect(headerRect.x,      headerRect.y, upRect.x - headerRect.x, headerRect.height);

        if (GUI.Button(clickRect, GUIContent.none, GUIStyle.none))
        {
            if (isExpanded) expandedOps.Remove(index);
            else expandedOps.Add(index);
        }

        GUI.Label(arrowRect, isExpanded ? "▼" : "▶", EditorStyles.label);
        GUI.Label(indexRect, $"#{index}", EditorStyles.miniLabel);
        GUI.Label(labelRect, op.GetDisplayName(), EditorStyles.boldLabel);

        if (GUI.Button(upRect, Styles.iconUp, Styles.miniButtonLeft) && index > 0)
        {
            operations.RemoveAt(index);
            operations.Insert(index - 1, op);
            if (expandedOps.Remove(index)) expandedOps.Add(index - 1);
        }
        if (GUI.Button(downRect, Styles.iconDown, Styles.miniButtonMid) && index < operations.Count - 1)
        {
            operations.RemoveAt(index);
            operations.Insert(index + 1, op);
            if (expandedOps.Remove(index)) expandedOps.Add(index + 1);
        }
        if (GUI.Button(removeRect, Styles.iconRemove, Styles.miniButtonRight))
        {
            if (EditorUtility.DisplayDialog("Remove Operation", $"Remove {op.GetDisplayName()}?", "Yes", "Cancel"))
            {
                operations.RemoveAt(index);
                expandedOps.Remove(index);
                for (int i = 0; i < expandedOps.Count; i++)
                    if (expandedOps[i] > index) expandedOps[i]--;
            }
        }

        if (isExpanded)
        {
            EditorGUILayout.BeginVertical(Styles.cardBody);
            EditorGUIUtility.labelWidth = 140;
            op.DrawParameters();
            EditorGUIUtility.labelWidth = 0;
            EditorGUILayout.EndVertical();
        }

        EditorGUILayout.EndVertical();
    }

    void DrawFooter()
    {
        EditorGUILayout.BeginVertical(EditorStyles.inspectorDefaultMargins);
        EditorGUILayout.Space(5);

        EditorGUILayout.BeginHorizontal();
        if (GUILayout.Button(new GUIContent(Styles.iconRead.image, "Read from Playhead"), Styles.miniButtonLeft, GUILayout.Width(35), GUILayout.Height(24)))
            ReadFromPlayhead();
        if (GUILayout.Button(new GUIContent(Styles.iconKey.image, "Record Keyframe"), Styles.miniButtonMid, GUILayout.Width(35), GUILayout.Height(24)))
            ApplyToMaterial(recordKeyframes: true);
        if (GUILayout.Button(new GUIContent(Styles.iconDeleteKey.image, "Delete Keyframe"), Styles.miniButtonMid, GUILayout.Width(35), GUILayout.Height(24)))
            DeleteKeyframeAtCurrentTime();
        if (GUILayout.Button(new GUIContent("Snap", "Snap to nearest keyframe"), Styles.miniButtonRight, GUILayout.Width(50), GUILayout.Height(24)))
            SnapToNearestKeyframe();

        GUILayout.FlexibleSpace();

        if (GUILayout.Button(new GUIContent(Styles.iconClear.image, "Clear All"), Styles.footerButton))
        {
            if (EditorUtility.DisplayDialog("Clear All Operations", "Remove all operations from the pipeline?", "Clear", "Cancel"))
            {
                operations.Clear();
                expandedOps.Clear();
                if (targetMaterial != null)
                    ApplyToMaterial();
            }
        }
        EditorGUILayout.EndHorizontal();

        EditorGUILayout.Space(4);

        EditorGUILayout.BeginHorizontal();
        if (GUILayout.Button(new GUIContent(Styles.iconPrev.image, "Step Back"), Styles.miniButtonLeft, GUILayout.Width(35), GUILayout.Height(24)))
            AdvancePlayhead(-frameStep);
        var centerField = new GUIStyle(EditorStyles.numberField) { alignment = TextAnchor.MiddleCenter, fixedHeight = 24 };
        frameStep = EditorGUILayout.IntField(frameStep, centerField, GUILayout.Width(40));
        if (frameStep < 1) frameStep = 1;
        if (GUILayout.Button(new GUIContent(Styles.iconNext.image, "Step Forward"), Styles.miniButtonRight, GUILayout.Width(35), GUILayout.Height(24)))
            AdvancePlayhead(frameStep);
        GUILayout.FlexibleSpace();
        EditorGUILayout.EndHorizontal();

        EditorGUILayout.Space(5);
        EditorGUILayout.LabelField($"{operations.Count} / 16 Operations", EditorStyles.centeredGreyMiniLabel);
        EditorGUILayout.EndVertical();
    }

    void ShowAddOperationMenu()
    {
        var menu = new GenericMenu();
        menu.AddItem(new GUIContent("Tube to Plane"),            false, () => AddOperation(new TubeToPlaneOp()));
        menu.AddItem(new GUIContent("Plane to Tube"),            false, () => AddOperation(new PlaneToTubeOp()));
        menu.AddItem(new GUIContent("Plane to Hemi-Octahedron"), false, () => AddOperation(new PlaneToHemiOctahedronOp()));
        menu.AddItem(new GUIContent("Hemi-Octahedron to Plane"), false, () => AddOperation(new HemiOctahedronToPlaneOp()));
        menu.AddItem(new GUIContent("Plane to Octahedron"),      false, () => AddOperation(new PlaneToOctahedronOp()));
        menu.AddItem(new GUIContent("Octahedron to Plane"),      false, () => AddOperation(new OctahedronToPlaneOp()));
        menu.AddSeparator("");
        menu.AddItem(new GUIContent("Point Align"),              false, () => AddOperation(new PointAlignOp()));
        menu.AddItem(new GUIContent("Axis Align"),               false, () => AddOperation(new AxisAlignOp()));
        menu.AddSeparator("");
        menu.AddItem(new GUIContent("Scale"),                    false, () => AddOperation(new ScaleOp()));
        menu.AddItem(new GUIContent("Translate"),                false, () => AddOperation(new TranslateOp()));
        menu.AddItem(new GUIContent("Rotate"),                   false, () => AddOperation(new RotateOp()));
        menu.AddItem(new GUIContent("Norm Conversion"),          false, () => AddOperation(new NormConversionOp()));
        menu.AddItem(new GUIContent("Seal"),                     false, () => AddOperation(new SealOp()));
        menu.AddSeparator("");
        menu.AddItem(new GUIContent("Sine Waves"),               false, () => AddOperation(new SineWavesOp()));
        menu.AddItem(new GUIContent("FBM"),                      false, () => AddOperation(new FBMOp()));
        menu.ShowAsContext();
    }

    void AddOperation(DeformOperation op)
    {
        if (operations.Count >= 16) return;
        operations.Add(op);
        expandedOps.Add(operations.Count - 1);
    }

    void ApplyToMaterial(bool recordKeyframes = false)
    {
        var builder = FoldPipelineBuilder.Create().For(targetMaterial);
        foreach (var op in operations)
            op.ApplyTo(builder);
        builder.Apply();

        if (AnimationMode.InAnimationMode())
            ApplyPropertyBlock(builder);
        if (recordKeyframes)
            RecordAnimationKeyframes(builder);
    }

    void ApplyPropertyBlock(FoldPipelineBuilder builder)
    {
        if (targetObject == null) return;
        var renderer = targetObject.GetComponent<Renderer>();
        if (renderer == null) return;

        var mpb = new MaterialPropertyBlock();
        renderer.GetPropertyBlock(mpb);
        mpb.SetFloat("_Vertex_Deformation_Enabled", 1f);
        for (int i = 0; i < 16; i++)
        {
            var slot = builder.GetSlot(i);
            if (slot != null) slot.ApplyToPropertyBlock(mpb, i);
            else FoldSlot.ClearInPropertyBlock(mpb, i);
        }
        renderer.SetPropertyBlock(mpb);
    }

    void ClearPropertyBlock()
    {
        if (targetObject == null) return;
        var renderer = targetObject.GetComponent<Renderer>();
        if (renderer != null)
            renderer.SetPropertyBlock(null);
    }

    #region Animation Recording

    void ReadFromPlayhead()
    {
        if (!TryGetAnimationWindowState(out var clip, out float time)) return;
        LoadFromClipPreservingExpanded(clip, time);
        lastAnimTime = time;
        ApplyToMaterial();
        Repaint();
    }

    void LoadFromClipPreservingExpanded(AnimationClip clip, float time)
    {
        var savedExpanded = new List<int>(expandedOps);
        LoadFromAnimationClip(clip, time);
        expandedOps = savedExpanded;
        expandedOps.RemoveAll(i => i >= operations.Count);
    }

    void RecordAnimationKeyframes(FoldPipelineBuilder builder)
    {
        if (!TryGetRecordingState(out var clip, out float time, out _, out string path)) return;

        isRecording = true;
        try
        {
            Undo.RecordObject(clip, "Create Fold Keyframe");
            SetFloatKey(clip, path, "material._Vertex_Deformation_Enabled", 1f, time);

            for (int i = 0; i < 16; i++)
            {
                var slot = builder.GetSlot(i);
                var prefix = $"material._Vertex_Deformation_Slot_{i}_";
                SetFloatKey(clip, path, prefix + "Enabled", slot != null ? 1f : 0f, time);
                SetDiscreteKey(clip, path, prefix + "Opcode", slot?.opcode ?? 0, time);
                SetFloatKey(clip, path, prefix + "Float_0", slot?.float0 ?? 0f, time);
                SetFloatKey(clip, path, prefix + "Float_1", slot?.float1 ?? 0f, time);
                SetFloatKey(clip, path, prefix + "Float_2", slot?.float2 ?? 0f, time);
                SetFloatKey(clip, path, prefix + "Float_3", slot?.float3 ?? 0f, time);
                SetVectorKey(clip, path, prefix + "Vector_0", slot?.vec0 ?? Vector4.zero, time);
                SetVectorKey(clip, path, prefix + "Vector_1", slot?.vec1 ?? Vector4.zero, time);
                SetVectorKey(clip, path, prefix + "Vector_2", slot?.vec2 ?? Vector4.zero, time);
                SetVectorKey(clip, path, prefix + "Vector_3", slot?.vec3 ?? Vector4.zero, time);
            }

            lastAnimTime = time;
        }
        finally
        {
            isRecording = false;
        }
    }

    void DeleteKeyframeAtCurrentTime()
    {
        if (!TryGetRecordingState(out var clip, out float time, out _, out string path)) return;

        Undo.RecordObject(clip, "Delete Fold Keyframe");
        foreach (var binding in AnimationUtility.GetCurveBindings(clip))
        {
            if (binding.type != typeof(Renderer)) continue;
            if (binding.path != path) continue;
            if (!binding.propertyName.StartsWith("material._Vertex_Deformation_")) continue;

            var curve = AnimationUtility.GetEditorCurve(clip, binding);
            if (curve == null) continue;

            bool removed = false;
            for (int i = curve.length - 1; i >= 0; i--)
            {
                if (Mathf.Approximately(curve.keys[i].time, time))
                {
                    curve.RemoveKey(i);
                    removed = true;
                }
            }

            if (removed)
                AnimationUtility.SetEditorCurve(clip, binding, curve.length == 0 ? null : curve);
        }
    }

    bool TryGetRecordingState(out AnimationClip clip, out float time, out Renderer renderer, out string path)
    {
        clip = null; time = 0f; renderer = null; path = "";
        if (targetObject == null || !AnimationMode.InAnimationMode()) return false;
        renderer = targetObject.GetComponent<Renderer>();
        if (renderer == null) return false;
        if (!TryGetAnimationWindowState(out clip, out time)) return false;
        var animator = targetObject.GetComponentInParent<Animator>();
        path = animator != null
            ? AnimationUtility.CalculateTransformPath(renderer.transform, animator.transform)
            : "";
        return true;
    }

    static void SetFloatKey(AnimationClip clip, string path, string prop, float value, float time)
    {
        var binding = EditorCurveBinding.FloatCurve(path, typeof(Renderer), prop);
        var curve = AnimationUtility.GetEditorCurve(clip, binding) ?? new AnimationCurve();
        AddOrReplaceKey(curve, time, value);
        AnimationUtility.SetEditorCurve(clip, binding, curve);
    }

    static void SetDiscreteKey(AnimationClip clip, string path, string prop, int value, float time)
    {
        var binding = EditorCurveBinding.DiscreteCurve(path, typeof(Renderer), prop);
        var curve = AnimationUtility.GetEditorCurve(clip, binding) ?? new AnimationCurve();
        AddOrReplaceKey(curve, time, value);
        AnimationUtility.SetEditorCurve(clip, binding, curve);
    }

    static void SetVectorKey(AnimationClip clip, string path, string prop, Vector4 v, float time)
    {
        SetFloatKey(clip, path, prop + ".x", v.x, time);
        SetFloatKey(clip, path, prop + ".y", v.y, time);
        SetFloatKey(clip, path, prop + ".z", v.z, time);
        SetFloatKey(clip, path, prop + ".w", v.w, time);
    }

    static void AddOrReplaceKey(AnimationCurve curve, float time, float value)
    {
        for (int i = curve.length - 1; i >= 0; i--)
            if (Mathf.Approximately(curve.keys[i].time, time))
                curve.RemoveKey(i);
        curve.AddKey(new Keyframe(time, value));
    }

    void SeekTo(float time)
    {
        SetAnimationWindowTime(time);
        lastAnimTime = time;
        ApplyToMaterial();
        Repaint();
    }

    void AdvancePlayhead(int frames)
    {
        if (!TryGetAnimationWindowState(out var clip, out float time)) return;
        SeekTo(time + frames * (1f / clip.frameRate));
    }

    void SnapToNearestKeyframe()
    {
        if (!TryGetAnimationWindowState(out var clip, out float time)) return;

        float bestTime = time;
        float bestDist = float.MaxValue;

        foreach (var binding in AnimationUtility.GetCurveBindings(clip))
        {
            if (!binding.propertyName.StartsWith("material._Vertex_Deformation_")) continue;
            var curve = AnimationUtility.GetEditorCurve(clip, binding);
            if (curve == null) continue;
            foreach (var key in curve.keys)
            {
                float dist = Mathf.Abs(key.time - time);
                if (dist > 0f && dist < bestDist) { bestDist = dist; bestTime = key.time; }
            }
        }

        if (bestDist < float.MaxValue)
            SeekTo(bestTime);
    }

    static void SetAnimationWindowTime(float time)
    {
        CacheAnimWindowReflection();
        if (s_animWindowType == null || s_timeProp == null) return;
        var windows = Resources.FindObjectsOfTypeAll(s_animWindowType);
        if (windows.Length == 0) return;
        s_timeProp.SetValue(windows[0], time);
        ((EditorWindow)windows[0]).Repaint();
    }

    static bool TryGetAnimationWindowState(out AnimationClip clip, out float time)
    {
        clip = null;
        time = 0f;
        CacheAnimWindowReflection();
        if (s_animWindowType == null || s_clipProp == null || s_timeProp == null) return false;
        var windows = Resources.FindObjectsOfTypeAll(s_animWindowType);
        if (windows.Length == 0) return false;
        var window = windows[0];
        clip = s_clipProp.GetValue(window) as AnimationClip;
        time = (float)s_timeProp.GetValue(window);
        return clip != null;
    }

    #endregion

    void LoadFromMaterial()
    {
        operations.Clear();
        expandedOps.Clear();

        for (int i = 0; i < 16; i++)
        {
            var prefix = $"_Vertex_Deformation_Slot_{i}_";
            if (targetMaterial.GetFloat(prefix + "Enabled") < 0.5f) break;

            int opcode = targetMaterial.GetInteger(prefix + "Opcode");
            if (opcode == 0) break;

            var slot = new FoldSlot
            {
                opcode = opcode,
                float0 = targetMaterial.GetFloat(prefix + "Float_0"),
                float1 = targetMaterial.GetFloat(prefix + "Float_1"),
                float2 = targetMaterial.GetFloat(prefix + "Float_2"),
                float3 = targetMaterial.GetFloat(prefix + "Float_3"),
                vec0   = targetMaterial.GetVector(prefix + "Vector_0"),
                vec1   = targetMaterial.GetVector(prefix + "Vector_1"),
                vec2   = targetMaterial.GetVector(prefix + "Vector_2"),
                vec3   = targetMaterial.GetVector(prefix + "Vector_3"),
            };

            var op = DeformOperation.Create(slot);
            if (op == null) break;
            operations.Add(op);
        }
    }

    void LoadFromAnimationClip(AnimationClip clip, float time)
    {
        if (targetObject == null) return;
        var renderer = targetObject.GetComponent<Renderer>();
        if (renderer == null) return;

        var animator = targetObject.GetComponentInParent<Animator>();
        string path = animator != null
            ? AnimationUtility.CalculateTransformPath(renderer.transform, animator.transform)
            : "";

        operations.Clear();

        for (int i = 0; i < 16; i++)
        {
            var prefix = $"material._Vertex_Deformation_Slot_{i}_";

            float enabled = SampleFloatCurve(clip, path, prefix + "Enabled", time);
            if (enabled < 0.5f) break;

            int opcode = SampleDiscreteCurve(clip, path, prefix + "Opcode", time);
            if (opcode == 0) break;

            var slot = new FoldSlot
            {
                opcode = opcode,
                float0 = SampleFloatCurve(clip, path, prefix + "Float_0", time),
                float1 = SampleFloatCurve(clip, path, prefix + "Float_1", time),
                float2 = SampleFloatCurve(clip, path, prefix + "Float_2", time),
                float3 = SampleFloatCurve(clip, path, prefix + "Float_3", time),
                vec0   = SampleVectorCurve(clip, path, prefix + "Vector_0", time),
                vec1   = SampleVectorCurve(clip, path, prefix + "Vector_1", time),
                vec2   = SampleVectorCurve(clip, path, prefix + "Vector_2", time),
                vec3   = SampleVectorCurve(clip, path, prefix + "Vector_3", time),
            };

            var op = DeformOperation.Create(slot);
            if (op == null) break;
            operations.Add(op);
        }
    }

    static float SampleFloatCurve(AnimationClip clip, string path, string prop, float time)
    {
        var binding = EditorCurveBinding.FloatCurve(path, typeof(Renderer), prop);
        var curve = AnimationUtility.GetEditorCurve(clip, binding);
        return curve?.Evaluate(time) ?? 0f;
    }

    static int SampleDiscreteCurve(AnimationClip clip, string path, string prop, float time)
    {
        var binding = EditorCurveBinding.DiscreteCurve(path, typeof(Renderer), prop);
        var curve = AnimationUtility.GetEditorCurve(clip, binding);
        if (curve == null || curve.length == 0) return 0;

        int value = Mathf.RoundToInt(curve.keys[0].value);
        foreach (var key in curve.keys)
        {
            if (key.time > time) break;
            value = Mathf.RoundToInt(key.value);
        }
        return value;
    }

    static Vector4 SampleVectorCurve(AnimationClip clip, string path, string prop, float time) =>
        new Vector4(
            SampleFloatCurve(clip, path, prop + ".x", time),
            SampleFloatCurve(clip, path, prop + ".y", time),
            SampleFloatCurve(clip, path, prop + ".z", time),
            SampleFloatCurve(clip, path, prop + ".w", time));

}