using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using DG.Tweening;
using Lean.Pool;
using Ichni.RhythmGame;
using Michsky.MUIP;
using Sirenix.Utilities;
using TMPro;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace Ichni.Editor
{
    public partial class HierarchyTab : MonoBehaviour
    {
        public GameObject indentationLinePrefab;

        public GameElement connectedGameElement;
        public HierarchyTab parentTab;
        public List<HierarchyTab> childTabList;

        public int tabLayer;
        public bool isSelected;
        public bool isExpanded;
        public Image BgImage;
        public RectTransform tabRect;
        public LayoutElement layoutElement;
        public RectTransform tabMainRect;
        public Button tabButton;
        public Button expandButton;
        public DoubleCheckButton deleteButton;
        public TMP_Text tabButtonText;

        private List<GameObject> indentationLines = new List<GameObject>();

        public void SetTab(GameElement targetElement, GameElement parentElement, bool animate = true)
        {
            if (animate)
            {
                transform.localScale = Vector3.one;
                transform.DOScale(Vector3.one, 0.2f).SetEase(Ease.OutCirc).From(new Vector3(1, 0, 1));
            }
            else
            {
                transform.DOKill();
                transform.localScale = Vector3.one;
            }
            connectedGameElement = targetElement;
            tabButtonText.text = targetElement.elementName;
            targetElement.connectedTab = this;
            this.isExpanded = false;
            this.isSelected = false;
            this.childTabList = new List<HierarchyTab>();

            // 清除旧的缩进线
            for (int i = indentationLines.Count - 1; i >= 0; i--)
            {
                if (indentationLines[i] != null)
                    Destroy(indentationLines[i]);
            }
            indentationLines.Clear();

            if (parentElement == null)
            {
                this.tabLayer = 0;
                this.parentTab = null;
                this.transform.SetAsLastSibling();
            }
            else
            {
                this.parentTab = parentElement.connectedTab;
                parentElement.connectedTab.childTabList.Add(this);
                this.tabLayer = this.parentTab.tabLayer + 1;
                this.transform.SetSiblingIndex(this.parentTab.transform.GetSiblingIndex() + GetAllChildrenCount(this.parentTab));

                if (!this.parentTab.isExpanded)
                {
                    this.isExpanded = false;
                    var pt = this.parentTab;
                    SetExpansion(false);
                    pt.SetStatus();
                    return;
                }

                for (int i = 1; i <= this.tabLayer; i++)
                {
                    float lineX = 30 * i - 15;
                    var d = Instantiate(indentationLinePrefab, tabRect);
                    d.GetComponent<RectTransform>().anchoredPosition = new Vector2(lineX, 0);
                    indentationLines.Add(d);
                }
                parentTab?.SetStatus();
            }


            float posX = (30 * tabLayer);
            tabMainRect.anchoredPosition = new Vector2(posX, tabMainRect.anchoredPosition.y);
            tabButton.onClick.RemoveAllListeners();
            tabButton.onClick.AddListener(SelectGameElement);
            expandButton.onClick.RemoveAllListeners();
            expandButton.onClick.AddListener(ExpandOrFold);
            deleteButton.onConfirm = () => EditorManager.instance.operationManager.CopyPasteDeleteModule.DeleteElement(connectedGameElement);

            SetStatus();

        }
        private void OnDestroy()
        {
            transform.DOKill();
            // 清除缩进线
            for (int i = indentationLines.Count - 1; i >= 0; i--)
            {
                if (indentationLines[i] != null)
                    Destroy(indentationLines[i]);
            }
            indentationLines.Clear();
        }

        public void SetStatus()
        {
            expandButton.gameObject.SetActive(!connectedGameElement.childElementList.IsNullOrEmpty());

        }
    }

    public partial class HierarchyTab
    {
        private int GetAllChildrenCount(HierarchyTab tab)
        {
            int c = tab.childTabList.Count;

            for (int i = 0; i < tab.childTabList.Count; i++)
            {
                c += GetAllChildrenCount(tab.childTabList[i]);
            }

            return c;
        }
        public void ExecuteOrSelect()
        {
            if (EditorManager.instance.uiManager.hierarchy.NeedExecute)
            {
                EditorManager.instance.uiManager.hierarchy.upLoadElement = connectedGameElement;
            }
            else
            {
                SelectGameElement();
            }
        }

        public void SelectGameElement()
        {
            if (Keyboard.current.leftCtrlKey.isPressed)
            {
                if (!isSelected)
                {
                    EditorManager.instance.operationManager.AddSelectElement(connectedGameElement);
                }
                else
                {
                    EditorManager.instance.operationManager.RemoveSelectElement(connectedGameElement);
                }
            }
            else
            {
                EditorManager.instance.operationManager.ClearSelectedElements();
                EditorManager.instance.operationManager.AddSelectElement(connectedGameElement);
            }
            if (EditorManager.instance.useQuickMove)
            {
                if (connectedGameElement is IHaveTransformSubmodule haveTransformSubmodule)
                {
                    QuickMover quickMover = Instantiate(EditorManager.instance.basePrefabs.QuickMoveObj).GetComponent<QuickMover>();
                    quickMover.Initialize(haveTransformSubmodule);
                }
                else if (connectedGameElement is NoteBase noteBase && noteBase.noteVisual != null)
                {
                    QuickMover quickMover = Instantiate(EditorManager.instance.basePrefabs.QuickMoveObj).GetComponent<QuickMover>();
                    quickMover.Initialize(noteBase.noteVisual);
                }
                else if (QuickMover.instance != null)
                {
                    Destroy(QuickMover.instance.gameObject);
                    QuickMover.instance = null;
                }
            }

            EditorManager.instance.uiManager.inspector.SetInspector(connectedGameElement);

        }
        public void MoveTab(bool isUp)
        {
            // 1. 基础合法性检查：根节点或孤立节点无法移动
            if (parentTab == null || connectedGameElement.parentElement == null)
                return;

            // 获取当前层级的列表
            var tabList = parentTab.childTabList;
            int tabIndex = tabList.IndexOf(this);
            var elementList = connectedGameElement.parentElement.childElementList;
            int elemIndex = elementList.IndexOf(connectedGameElement);

            // 计算目标索引
            int targetTabIndex = isUp ? tabIndex - 1 : tabIndex + 1;
            int targetElemIndex = isUp ? elemIndex - 1 : elemIndex + 1;

            // 2. 边界检查：如果是第一个往上或最后一个往下，则返回
            if (targetTabIndex < 0 || targetTabIndex >= tabList.Count) return;
            if (targetElemIndex < 0 || targetElemIndex >= elementList.Count) return;

            // 获取目标对象
            var targetTab = tabList[targetTabIndex];
            var targetElem = elementList[targetElemIndex];

            // 3. 交换逻辑数据顺序（List 内部排序）
            tabList[tabIndex] = targetTab;
            tabList[targetTabIndex] = this;

            elementList[elemIndex] = targetElem;
            elementList[targetElemIndex] = connectedGameElement;

            // 4. 处理 UI Tab 的 Sibling Index（解决偏移问题的核心）
            List<Transform> thisSubTree = GetTabSubTreeTransforms(this);
            List<Transform> targetSubTree = GetTabSubTreeTransforms(targetTab);

            if (thisSubTree.Count > 0 && targetSubTree.Count > 0)
            {
                if (isUp)
                {
                    // 向上移：正序，插到目标分支的最上方
                    int insertIndex = targetSubTree[0].GetSiblingIndex();
                    for (int i = 0; i < thisSubTree.Count; i++)
                    {
                        thisSubTree[i].SetSiblingIndex(insertIndex + i);
                    }
                }
                else
                {
                    // 向下移：逆序，依次插到目标分支最末尾的索引位置
                    // 这样先移过去的会被后移过去的顶到后面，保持原有父子相对顺序
                    int targetLastIndex = targetSubTree[targetSubTree.Count - 1].GetSiblingIndex();
                    for (int i = thisSubTree.Count - 1; i >= 0; i--)
                    {
                        thisSubTree[i].SetSiblingIndex(targetLastIndex);
                    }
                }
            }

            // 5. 处理场景 GameElement 的 Sibling Index（同理）
            List<Transform> thisElemSubTree = GetElementSubTreeTransforms(connectedGameElement);
            List<Transform> targetElemSubTree = GetElementSubTreeTransforms(targetElem);

            if (thisElemSubTree.Count > 0 && targetElemSubTree.Count > 0)
            {
                if (isUp)
                {
                    int insertIndex = targetElemSubTree[0].GetSiblingIndex();
                    for (int i = 0; i < thisElemSubTree.Count; i++)
                    {
                        thisElemSubTree[i].SetSiblingIndex(insertIndex + i);
                    }
                }
                else
                {
                    int targetLastIndex = targetElemSubTree[targetElemSubTree.Count - 1].GetSiblingIndex();
                    for (int i = thisElemSubTree.Count - 1; i >= 0; i--)
                    {
                        thisElemSubTree[i].SetSiblingIndex(targetLastIndex);
                    }
                }
            }
            //奇妙的特判阶段
            foreach (var i in parentTab.childTabList)
            {
                i.connectedGameElement.Refresh();
            }
            parentTab.connectedGameElement.Refresh();

            if (parentTab.connectedGameElement is Track track)
            {
                track.trackPathSubmodule.pathNodeList =
                track.childElementList.OfType<PathNode>().ToList();
                track.trackPathSubmodule.SetPathPoints();
            }


        }

        // 获取tab及其所有子tab的transform（前序遍历）
        private List<Transform> GetTabSubTreeTransforms(HierarchyTab tab)
        {
            List<Transform> list = new List<Transform>();
            list.Add(tab.transform);
            foreach (var child in tab.childTabList)
                list.AddRange(GetTabSubTreeTransforms(child));
            return list;
        }

        // 获取GameElement及其所有子元素的transform（前序遍历）
        private List<Transform> GetElementSubTreeTransforms(GameElement element)
        {
            List<Transform> list = new List<Transform>();
            if (element.transform != null)
                list.Add(element.transform);
            foreach (var child in element.childElementList)
                list.AddRange(GetElementSubTreeTransforms(child));
            return list;
        }
        public void ExpandOrFold()
        {
            ExpandOrFold(false);
        }
        public void ExpandOrFold(bool forceAllExPand = false)
        {
            this.childTabList.RemoveAll(s => s == null);
            isExpanded = !isExpanded;
            ExpandAnim();
            if (isExpanded)
            {
                connectedGameElement.ScanAndAddEnableTypes();
                List<GameElement> FixedList = !forceAllExPand ? connectedGameElement.GetChildrenByTypes() : connectedGameElement.childElementList;

                ExpandAsync(FixedList);

            }
            else
            {
                //expandButton.transform.Rotate(new Vector3(0, 0, 180));
                for (int i = childTabList.Count - 1; i >= 0; i--)
                {
                    childTabList[i].SetExpansion(isExpanded);
                }
            }
        }

        private void SetExpansion(bool expand)
        {
            if (!expand && isExpanded)
            {
                for (int i = childTabList.Count - 1; i >= 0; i--)
                {
                    if (childTabList[i] != null)
                        childTabList[i].SetExpansion(expand);
                }
            }

            if (!expand)
            {
                CleanupAndDespawn();
            }
        }

        private void CleanupAndDespawn()
        {
            if (connectedGameElement != null)
            {
                // 如果该元素还在选中列表中，先移除（须在 connectedTab=null 之前执行）
                if (isSelected)
                {
                    var sel = EditorManager.instance.operationManager.currentSelectedElements;
                    sel.Remove(connectedGameElement);
                    isSelected = false;
                }
                connectedGameElement.connectedTab = null;
            }

            parentTab?.childTabList.Remove(this);
            EditorManager.instance.uiManager.hierarchy.tabList.Remove(this);

            transform.DOKill();

            tabButton.onClick.RemoveAllListeners();
            expandButton.onClick.RemoveAllListeners();

            for (int i = indentationLines.Count - 1; i >= 0; i--)
            {
                if (indentationLines[i] != null)
                    Destroy(indentationLines[i]);
            }
            indentationLines.Clear();

            connectedGameElement = null;
            parentTab = null;
            childTabList?.Clear();
            isExpanded = false;
            isExpandDone = true;
            tabLayer = 0;

            LeanPool.Despawn(gameObject);
        }
        private void ExpandAnim()
        {
            expandButton.transform.DORotate(new Vector3(0, 0, !isExpanded ? 0f : 180f), 0.2f);
        }

        public bool isExpandDone = true;
        private void ExpandImmediately(List<GameElement> FixedList)
        {
            float StrandTimeWhileStartUp = EditorManager.instance.CurrentFrameRate;
            float frameTime = 1f / StrandTimeWhileStartUp * 3f;

            for (var index = 0; index < FixedList.Count; index++)
            {
                var childElement = FixedList[index];
                EditorManager.instance.uiManager.hierarchy.GenerateTab(childElement, connectedGameElement);
            }
        }
        public IEnumerator ExpandSyncBatched()
        {
            connectedGameElement.ScanAndAddEnableTypes();
            isExpanded = true;
            isExpandDone = false;
            ExpandAnim();

            var children = connectedGameElement.childElementList;
            int batchCount = 0;
            for (int i = 0; i < children.Count; i++)
            {
                if (!isExpanded) break;
                if (children[i].connectedTab == null)
                {
                    EditorManager.instance.uiManager.hierarchy.GenerateTab(children[i], connectedGameElement, false);
                    batchCount++;
                    if (batchCount >= 15)
                    {
                        batchCount = 0;
                        yield return null;
                        if (!isExpanded) break;
                    }
                }
            }

            isExpandDone = true;
        }

        async void ExpandAsync(List<GameElement> FixedList)
        {
            isExpandDone = false;
            for (var index = 0; index < FixedList.Count; index++)
            {

                var childElement = FixedList[index];
                await EditorManager.instance.uiManager.hierarchy.GenerateTabAsync(childElement, connectedGameElement);
                if (!isExpanded) break;

            }
            isExpandDone = true;

        }
    }
}