using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using DG.Tweening;
using Dreamteck;
using Dreamteck.Splines;
using Dreamteck.Splines.Primitives;
using ichni.RhythmGame;
using Ichni;
using Ichni.Editor;
using Ichni.RhythmGame;
using Ichni.RhythmGame.Beatmap;
using TMPro;
using UniRx;
using Unity.VisualScripting;





// [修复] 统一命名空间引用
using UnityEngine;
using UnityEngine.InputSystem;

namespace ichni.RhythmGame // [修复] 修正命名空间首字母大写，符合C#规范
{
    public partial class FastNoteTracker : GameElement, IBeChangeInExport
    {
        public Track TrackedTrack { get => parentElement as Track; }
        private bool _isEnabled = false;
        public float horizonWidth = 5f;
        public bool IsEnabled
        {
            get => _isEnabled;
            set
            {
                _isEnabled = value;
                foreach (var preview in NotePreviews.Values)
                {
                    if (preview != null) preview.gameObject.SetActive(showNotePreview);
                }

                Refresh();
            }
        }
        public bool showNotePreview
        {
            get => _showNotePreview;
            set
            {
                _showNotePreview = value;
                foreach (var preview in NotePreviews.Values)
                {
                    if (preview != null) preview.gameObject.SetActive(showNotePreview);
                }
                Refresh();
            }
        }
        private bool _showNotePreview = false;
        BaseElement_BM IBeChangeInExport.MatchingExportElement { get => null; set { } }

        // NotePreview和TextHint的容器
        private Transform _previewRoot;
        private Transform PreviewRoot
        {
            get
            {
                if (_previewRoot == null)
                {
                    var obj = GameObject.Find("NotePreviewRoot");
                    if (obj == null)
                    {
                        obj = new GameObject("NotePreviewRoot");
                        obj.transform.SetParent(this.transform, false);
                    }
                    _previewRoot = obj.transform;
                }
                return _previewRoot;
            }
        }

        private class NotePreviewData : MonoBehaviour
        {
            public float noteTime;
            public NoteBase noteBase1;
            public LineRenderer lineRenderer;

            public void Initialize(float time, NoteBase noteBase)
            {
                noteTime = time;
                noteBase1 = noteBase;
                lineRenderer = this.gameObject.AddComponent<LineRenderer>();
                lineRenderer.useWorldSpace = false;
                lineRenderer.positionCount = 2;
                lineRenderer.startWidth = 1f;
                lineRenderer.endWidth = 0f;
                lineRenderer.material = EditorManager.instance.basePrefabs.defaultTrackMaterial;
                Color color = new Color(1f, 0.5f, 0f, 0.8f);
                DOTween.ToAlpha(() => color, c => color = c, 1f, 1f).SetEase(Ease.InOutQuad).OnUpdate(() =>
                {
                    lineRenderer.startColor = lineRenderer.endColor = color;
                });

            }
            public void Refresh(SplineComputer spline, TrackTimeSubmoduleMovable trackTime, float horizonWidth)
            {
                float trackPercent = Mathf.Clamp01(trackTime.GetTrackPercentRaw(noteTime));
                SplineSample sample = spline.Evaluate(trackPercent);
                Vector3 sideOffset = sample.rotation * (noteBase1.noteVisual != null ? noteBase1.noteVisual.transformSubmodule.originalPosition : Vector3.zero);
                Vector3 worldPos = sample.position;

                Vector3 localPos = this.transform.parent.InverseTransformPoint(worldPos);
                Vector3 localOffset = this.transform.parent.InverseTransformVector(Vector3.up);
                lineRenderer.SetPosition(0, localPos + sideOffset);
                lineRenderer.SetPosition(1, localPos + localOffset + sideOffset);
            }
            void OnDestroy() { }
        }
        // NotePreviews字典改为以时间为key
        private Dictionary<float, NotePreviewData> NotePreviews = new Dictionary<float, NotePreviewData>();
        public List<LineRenderer> BeatLines = new List<LineRenderer>();
        public List<float> Beats = new List<float>();
        public override void Refresh()
        {
            base.Refresh();
            UpdateBeatLine();
            RefreshNotePreviews();
        }

        // 刷新NotePreviews，按时间生成预览
        private void RefreshNotePreviews()
        {
            if (TrackedTrack == null) return;
            if (!_isEnabled) return;
            if (!showNotePreview) return;
            var notes = TrackedTrack.childElementList.OfType<NoteBase>().ToList();
            var times = notes.Select(n => n.exactJudgeTime).ToList();
            // 移除已不存在的note时间
            var toRemove = NotePreviews.Keys.Except(times).ToList();
            foreach (var t in toRemove)
            {
                if (NotePreviews[t] != null) Destroy(NotePreviews[t].gameObject);
                NotePreviews.Remove(t);
            }
            // 添加新note时间
            foreach (var n in notes)
            {
                float time = n.exactJudgeTime;
                if (!NotePreviews.ContainsKey(time))
                {
                    var obj = new GameObject($"NotePreview_{n.elementName}_{time}");
                    obj.transform.SetParent(PreviewRoot, false);
                    var preview = obj.AddComponent<NotePreviewData>();
                    preview.Initialize(time, n);
                    NotePreviews[time] = preview;
                }
            }
            // 刷新所有预览
            SplineComputer spline = TrackedTrack.trackPathSubmodule.path;
            var trackTime = TrackedTrack.trackTimeSubmodule as TrackTimeSubmoduleMovable;
            foreach (var preview in NotePreviews.Values)
            {
                if (preview != null)
                {
                    Observable.NextFrame().Subscribe(_ =>
                    {
                        preview.Refresh(spline, trackTime, horizonWidth);
                    });
                }
            }
        }

        public int BeatDiver = 1; // [建议] 变量名修正为 BeatDiver (原本是 Beatdiver)

        private LineRenderer selectedLine = null;

        // 工具方法：计算线条的两个端点位置
        private void CalculateLinePositions(SplineSample sample, out Vector3 pos0, out Vector3 pos1)
        {
            Vector3 sideOffset = sample.rotation * Vector3.left * horizonWidth;
            pos0 = sample.position + sideOffset;
            pos1 = sample.position - sideOffset;
        }

        // 工具方法：配置 LineRenderer 的基础属性
        private void SetupLineRenderer(LineRenderer line, Vector3 pos0, Vector3 pos1, Color color, bool refreshWidth = true)
        {
            line.useWorldSpace = true;
            line.positionCount = 2;
            line.SetPosition(0, pos0);
            line.SetPosition(1, pos1);
            if (refreshWidth)
            {
                line.startWidth = 0.05f;
                line.endWidth = 0.05f;
            }
            line.material = EditorManager.instance.basePrefabs.defaultTrailMaterial;
            line.startColor = line.endColor = color;
        }

        private void RefreshMeshCollider(LineRenderer lineA, LineRenderer lineB)
        {
            MeshCollider col = lineA.GetComponent<MeshCollider>();
            if (col == null) col = lineA.gameObject.AddComponent<MeshCollider>();

            Vector3 a1 = lineA.GetPosition(0);
            Vector3 a2 = lineA.GetPosition(1);
            Vector3 b1 = lineB.GetPosition(0);
            Vector3 b2 = lineB.GetPosition(1);

            if (Vector3.Distance(a1, b1) < 0.001f)
            {
                if (col.sharedMesh != null) col.sharedMesh.Clear();
                return;
            }

            // 转换为局部坐标
            Vector3[] newVertices = new Vector3[] {
        lineA.transform.InverseTransformPoint(a1),
        lineA.transform.InverseTransformPoint(a2),
        lineA.transform.InverseTransformPoint(b1),
        lineA.transform.InverseTransformPoint(b2)
    };

            Mesh mesh = col.sharedMesh;
            if (mesh == null)
            {
                mesh = new Mesh();
                mesh.name = "BeatLineMesh";
            }
            else
            {
                // [关键优化]：如果新旧顶点差异极小，则不刷新 Mesh，防止物理系统抖动
                if (mesh.vertexCount == 4 && Vector3.Distance(mesh.vertices[0], newVertices[0]) < 0.0001f)
                {
                    return;
                }
                mesh.Clear();
            }

            mesh.vertices = newVertices;
            mesh.triangles = new int[] { 0, 1, 2, 2, 1, 3, 2, 1, 0, 3, 1, 2 };
            mesh.RecalculateNormals();
            mesh.RecalculateBounds();
            col.sharedMesh = mesh;

            // 确保 Tag 正确
            if (!lineA.CompareTag("LineRenderer")) lineA.tag = "LineRenderer";
        }
        public void UpdateBeatLine()
        {
            // 1. 清理
            foreach (var line in BeatLines) if (line != null) Destroy(line.gameObject);
            BeatLines.Clear();
            Beats.Clear();

            if (!_isEnabled) return;

            // 获取数据源
            SplineComputer splineComputer = TrackedTrack.trackPathSubmodule.path;
            var trackTime = TrackedTrack.trackTimeSubmodule as TrackTimeSubmoduleMovable;
            float beatStart = EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackStartTime);
            float beatEnd = EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackEndTime);

            // 2. 批量生成
            for (float b = beatStart - 1; b <= beatEnd + 1f / BeatDiver; b += 1f / BeatDiver)
            {
                float timeAtBeat = EditorManager.instance.songInformation.beatManager.GetTimeFromBeat(b);
                float trackPercent = Mathf.Clamp01(trackTime.GetTrackPercentRaw(timeAtBeat));

                CalculateLinePositions(splineComputer.Evaluate(trackPercent), out Vector3 p0, out Vector3 p1);

                GameObject obj = Instantiate(EditorManager.instance.basePrefabs.emptyObject, this.transform);
                LineRenderer lr = obj.AddComponent<LineRenderer>();

                Color color = (Mathf.Abs(b - Mathf.Round(b)) <= 0.01f) ? Color.green : Color.cyan;
                SetupLineRenderer(lr, p0, p1, color);

                float bi = (trackPercent >= 1f) ? EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackEndTime) : b;
                Beats.Add(bi < 0 ? 0f : bi);
                BeatLines.Add(lr);
            }

            // 3. 批量生成 Collider
            for (int i = 0; i < BeatLines.Count - 1; i++) RefreshMeshCollider(BeatLines[i], BeatLines[i + 1]);
        }

        public void AdjustBeatLine()
        {
            if (!_isEnabled)
            {
                foreach (var line in BeatLines) if (line != null) line.gameObject.SetActive(false);
                return;
            }

            SplineComputer splineComputer = TrackedTrack.trackPathSubmodule.path;
            var trackTime = TrackedTrack.trackTimeSubmodule as TrackTimeSubmoduleMovable;
            float beatStart = EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackStartTime);
            float beatEnd = EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackEndTime);

            int index = 0;
            // 重置 Beats 列表以匹配新的位置
            Beats.Clear();

            for (float b = beatStart - 1; b <= beatEnd + 1f / BeatDiver; b += 1f / BeatDiver)
            {
                float timeAtBeat = EditorManager.instance.songInformation.beatManager.GetTimeFromBeat(b);
                float trackPercent = Mathf.Clamp01(trackTime.GetTrackPercentRaw(timeAtBeat));

                // 如果超出范围，跳过更新（除非你想一直显示）
                // 这里沿用你 UpdateBeatLine 的逻辑
                CalculateLinePositions(splineComputer.Evaluate(trackPercent), out Vector3 p0, out Vector3 p1);

                LineRenderer lr;
                if (index < BeatLines.Count)
                {
                    lr = BeatLines[index];
                    lr.gameObject.SetActive(true);
                }
                else
                {
                    GameObject obj = Instantiate(EditorManager.instance.basePrefabs.emptyObject, this.transform);
                    lr = obj.AddComponent<LineRenderer>();
                    BeatLines.Add(lr);
                }

                Color color = (Mathf.Abs(b - Mathf.Round(b)) <= 0.01f) ? Color.green : Color.cyan;
                SetupLineRenderer(lr, p0, p1, color, false);
                float bi = (trackPercent >= 1f) ? EditorManager.instance.songInformation.beatManager.GetBeatFromTime(trackTime.trackEndTime) : b;
                Beats.Add(bi < 0 ? 0f : bi);
                index++;
            }
            for (int i = index; i < BeatLines.Count; i++) BeatLines[i].gameObject.SetActive(false);
            for (int i = 0; i < index - 1; i++) RefreshMeshCollider(BeatLines[i], BeatLines[i + 1]);
        }
        public bool ForceRefresh = false;
        void Update()
        {
            if (ForceRefresh)
            {
                AdjustBeatLine();
                RefreshNotePreviews();
            }

            if (InputListener.instance.isPointerOverUI) return;
            CastRay();
            if (IsEnabled && selectedLine != null)
            {
                DetectNote();
            }

        }

        public void CastRay()
        {
            if (EditorManager.instance.cameraManager.currentCamera == null) return;

            Ray ray = EditorManager.instance.cameraManager.currentCamera.ScreenPointToRay(Mouse.current.position.ReadValue());
            RaycastHit hit;
            // Debug.DrawRay(ray.origin, ray.direction * 100f, Color.red);

            if (Physics.RaycastAll(ray).FirstOrDefault(h => h.collider.CompareTag("LineRenderer")).collider != null)
            {
                hit = Physics.RaycastAll(ray).First(h => h.collider.CompareTag("LineRenderer"));

                LineRenderer hoveredLine = hit.collider.GetComponent<LineRenderer>();
                if (BeatLines.Contains(hoveredLine))
                {
                    if (Mouse.current.leftButton.wasPressedThisFrame)
                    {
                        Debug.Log($"Clicked on line area: {hoveredLine.gameObject.name} at {hit.point}");
                    }
                    if (selectedLine != hoveredLine)
                    {
                        if (selectedLine != null)
                        {
                            selectedLine.startWidth = 0.05f;
                            selectedLine.endWidth = 0.05f;
                        }
                        selectedLine = hoveredLine;
                        selectedLine.startWidth = 0.15f;
                        selectedLine.endWidth = 0.15f;
                    }
                }

            }
            else
            {
                if (selectedLine != null)
                {
                    selectedLine.startWidth = 0.05f;
                    selectedLine.endWidth = 0.05f;
                    selectedLine = null;
                }
            }
        }

        public void InputDetected()
        {
            // if(Keyboard)
        }
        public void DetectNote()
        {
            if (Keyboard.current.digit1Key.wasPressedThisFrame)
                AddNote(0);
            else if (Keyboard.current.digit2Key.wasPressedThisFrame)
                AddNote(1);
            else if (Keyboard.current.digit3Key.wasPressedThisFrame)
                AddNote(2);
            else if (Keyboard.current.digit4Key.wasPressedThisFrame)
                AddNote(3);
        }
        public void AddNote(int NoteCode)
        {
            if (!EditorManager.instance.useNotePrefab)
            {
                LogWindow.Log("Please enable \"Note Prefab\" in EditorManager", Color.red);
                return;
            }
            if (selectedLine == null) return;
            float time = EditorManager.instance.songInformation.beatManager.GetTimeFromBeat(
                Beats[BeatLines.IndexOf(selectedLine)]
            );
            NoteBase a = null;
            switch (NoteCode)
            {

                case 0:
                    a = Tap.GenerateElement("New Tap", Guid.NewGuid(), new List<string>(), true, TrackedTrack, time);
                    a.noteVisual.transformSubmodule.Refresh();
                    break;
                case 3:
                    a = Hold.GenerateElement("New Hold", Guid.NewGuid(), new List<string>(), true, TrackedTrack, time, time + 0.5f);
                    a.noteVisual.transformSubmodule.Refresh();
                    Observable.NextFrame().Subscribe(_ =>
           {
               StartCoroutine(DraggingHold((Hold)a));
           });

                    break;
                case 1:
                    a = Stay.GenerateElement("New Stay", Guid.NewGuid(), new List<string>(), true, TrackedTrack, time);
                    a.noteVisual.transformSubmodule.Refresh();
                    break;
                case 2:
                    a = Flick.GenerateElement("New Flick", Guid.NewGuid(), new List<string>(), true, TrackedTrack, time, new List<Vector2>());
                    a.noteVisual.transformSubmodule.Refresh();
                    break;
                default:
                    break;
            }
            Observable.NextFrame().Subscribe(_ =>
            {
                CreateTextHint(a);
            });


        }
        private IEnumerator DraggingHold(Hold hold)
        {
            GameObject obj = Instantiate(EditorManager.instance.basePrefabs.emptyObject, this.transform);
            LineRenderer lr = obj.AddComponent<LineRenderer>();
            lr.startWidth = lr.endWidth = 0.05f;
            lr.positionCount = 2;
            lr.material = EditorManager.instance.basePrefabs.defaultTrailMaterial;
            lr.startColor = lr.endColor = Color.yellow;
            lr.SetPosition(0, hold.noteVisual.transform.position);
            lr.SetPosition(1, hold.noteVisual.transform.position);
            while (Keyboard.current.digit4Key.isPressed && selectedLine != null)

            {
                yield return null;
                try
                {

                    float time = EditorManager.instance.songInformation.beatManager.GetTimeFromBeat(
                    Beats[BeatLines.IndexOf(selectedLine)]
                );
                    hold.holdEndTime = time < hold.exactJudgeTime ? hold.exactJudgeTime + 0.1f : time;
                    hold.noteVisual.transformSubmodule.Refresh();
                    lr.SetPosition(1, (selectedLine.GetPosition(0) + selectedLine.GetPosition(1)) / 2);
                }
                catch (Exception e)
                {
                    Debug.LogWarning(e);
                    break;
                }
            }
            yield return null;
            Destroy(lr.gameObject);
            CreateTextHint(hold);
        }
        private void CreateTextHint(NoteBase noteBase)
        {
            // 1. 创建一个新的 GameObject
            string content = noteBase.elementName;
            GameObject hintObj = new GameObject("NoteHint_" + content);
            hintObj.transform.SetParent(PreviewRoot, false); // 统一放到PreviewRoot下
            // 2. 添加 TextMeshPro 组件 (注意是 TextMeshPro，不是 TextMeshProUGUI)
            TextMeshPro text = hintObj.AddComponent<TextMeshPro>();
            // 3. 配置文字属性
            text.text = content;
            text.fontSize = 6; // 根据你的缩放调整大小
            text.alignment = TextAlignmentOptions.Center;
            text.color = Color.yellow;

            // 4. (可选) 设置渲染层级，确保它在轨道上方显示
            // text.sortingOrder = 100;

            // 5. 动画效果：向上移动 1 个单位，并同时淡出
            // 1 秒后执行
            hintObj.transform.DOScale(Vector3.one * 1.2f, 1f).SetEase(Ease.OutBack).From(Vector3.zero);
            // 位置同步协程
            StartCoroutine(SyncHintPosition(hintObj.transform, noteBase));
            text.DOFade(0, 1f).OnComplete(() => Destroy(hintObj));
            // 让文字始终面向相机 (Billboard 效果)
            hintObj.transform.LookAt(hintObj.transform.position + Camera.main.transform.rotation * Vector3.forward,
                                    EditorManager.instance.cameraManager.currentCamera.transform.rotation * Vector3.up);
        }

        private IEnumerator SyncHintPosition(Transform hint, NoteBase noteBase)
        {
            float t = 0f;
            Vector3 offset = Vector3.up;
            while (t < 1f && noteBase != null && noteBase.noteVisual != null)
            {
                hint.position = noteBase.noteVisual.transform.position + offset;
                t += Time.deltaTime;
                yield return null;
            }
        }
    }

    // 后面的 Inspector 和 Export 代码逻辑暂时不需要大改，只要注意变量名 Beatdiver -> BeatDiver
    public partial class FastNoteTracker
    {
        public BaseElement_BM MatchingExportElement { get => null; set => throw new System.NotImplementedException(); }

        public void SaveExportBM() { }

        public override void SetUpInspector()
        {
            base.SetUpInspector();

            IHaveInspection inspector = EditorManager.instance.uiManager.inspector;
            var container = inspector.GenerateContainer("Fast Note Tracker");
            var sub = container.GenerateSubcontainer(2);
            inspector.GenerateToggle(this, sub, "Enabled", nameof(IsEnabled));
            // 修正变量名
            inspector.GenerateInputField(this, sub, "Beat Diver", nameof(BeatDiver));
            inspector.GenerateToggle(this, sub, "Force refresh (cost++)", nameof(ForceRefresh));
            inspector.GenerateInputField(this, sub, "Horizon Width", nameof(horizonWidth));
            inspector.GenerateToggle(this, sub, "Show Note Preview", nameof(showNotePreview));

        }

        public static FastNoteTracker GenerateElement(string elementName, Guid id, List<string> tags,
            bool isFirstGenerated, GameElement parentElement,
            bool isEnabled = true, bool showNotePreview = false, float horizonWidth = 5f, int beatDiver = 1)
        {
            FastNoteTracker fastNoteTracker = Instantiate(EditorManager.instance.basePrefabs.emptyObject, parentElement.transform)
                .AddComponent<FastNoteTracker>();
            if (parentElement is not Track)
            {
                LogWindow.Log("FastNoteTracker must be a child of Track element.");
                return null;
            }
            fastNoteTracker.Initialize(elementName, id, tags, isFirstGenerated, parentElement);
            fastNoteTracker.IsEnabled = isEnabled;
            fastNoteTracker.showNotePreview = showNotePreview;
            fastNoteTracker.horizonWidth = horizonWidth;
            fastNoteTracker.BeatDiver = beatDiver;
            return fastNoteTracker;
        }

        public override void Initialize(string elementName, Guid id, List<string> tags, bool isFirstGenerated, GameElement parentElement)
        {
            base.Initialize(elementName, id, tags, isFirstGenerated, parentElement);
            //parentElement.refreshAction += AdjustBeatLine;
        }
        public override void AfterInitialize()
        {
            Observable.NextFrame().Subscribe(_ => Refresh());
        }

        public override void SaveBM()
        {
            matchedBM = new FastNoteTracker_BM(
                elementName,
                elementGuid,
                tags,
                parentElement.elementGuid,
                IsEnabled,
                showNotePreview,
                horizonWidth,
                BeatDiver
            );
        }
    }
}

namespace Ichni.RhythmGame.Beatmap
{
    public class FastNoteTracker_BM : GameElement_BM
    {
        public bool IsEnabled { get; set; }
        public bool showNotePreview { get; set; }
        public float horizonWidth { get; set; }
        public int beatDiver { get; set; }

        public FastNoteTracker_BM(string elementName, Guid id, List<string> tags, Guid attachedElementGuid, bool IsEnabled, bool showNotePreview, float horizonWidth, int beatDiver)
        {
            this.elementName = elementName;
            this.elementGuid = id;
            this.tags = tags;
            this.attachedElementGuid = attachedElementGuid;
            this.IsEnabled = IsEnabled;
            this.showNotePreview = showNotePreview;
            this.horizonWidth = horizonWidth;
            this.beatDiver = beatDiver;
        }

        public override GameElement DuplicateBM(GameElement attached)
        {
            return FastNoteTracker.GenerateElement(elementName, elementGuid, tags, false, attached);
        }

        public override void ExecuteBM()
        {
            FastNoteTracker.GenerateElement(elementName, elementGuid, tags, false, GetElement(attachedElementGuid));
        }
    }
}