using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

// 定义一个可序列化的子网格类
[Serializable]
public class SubMeshes
{
    // 网格渲染器
    public MeshRenderer meshRenderer;
    // 原始位置
    public Vector3 originalPosition;
    // 展开后的位置
    public Vector3 explodedPosition;
}

// 定义一个三维模型功能类，继承自MonoBehaviour
public class ThreeDModelFunctions : MonoBehaviour
{
    public static ThreeDModelFunctions Instance;
    public Material m;
    public Camera MainCamera;

    #region Variables
    public List<SubMeshes> childMeshRenderers;
    public bool isInExplodedView = false; // 当前是否在爆炸视图
    public bool isMoving = false;         // 是否正在动画中
    public float explosionSpeed = 0.1f;   // 移动插值速度
    #endregion

    [Header("Canvas 管理")]
    public GameObject[] AllCanvas;

    [Header("UI 控制")]
    public Slider explosionSlider;

    // 当前爆炸程度 (0~1)
    [Range(0, 1)]
    public float explosionFactor = 0f;

    private void Awake()
    {
        Instance = this;
        Init();

        // 注册滑动条事件
        if (explosionSlider != null)
            explosionSlider.onValueChanged.AddListener(OnSliderValueChanged);
    }

    /// <summary>
    /// 初始化函数
    /// </summary>
    public void Init()
    {
        foreach (GameObject CanvasObj in AllCanvas)
            CanvasObj.SetActive(false);

        childMeshRenderers = new List<SubMeshes>();

        foreach (var item in GetComponentsInChildren<MeshRenderer>())
        {
            SubMeshes mesh = new SubMeshes();
            mesh.meshRenderer = item;
            mesh.originalPosition = item.transform.position;
            // 设置展开后位置（原逻辑保留）
            Vector3 vector3 = Math.Abs(item.bounds.center.x) > 4 ? item.bounds.center * 1.5f : item.bounds.center * 5f;
            mesh.explodedPosition = vector3;

            childMeshRenderers.Add(mesh);
        }
    }

    private void Update()
    {
        // Q键触发自动展开/收起动画
        if (Input.GetKeyDown(KeyCode.Q))
        {
            ToggleExplodedView();
            // 同步滑动条初值
            if (explosionSlider != null)
                explosionSlider.value = isInExplodedView ? 1f : 0f;
        }

        // 如果正在移动，执行动画过渡
        if (isMoving)
        {
            float target = isInExplodedView ? 1f : 0f;
            // 插值控制 explosionFactor
            explosionFactor = Mathf.Lerp(explosionFactor, target, Time.deltaTime * 2f);

            // 当接近目标值时，停止动画
            if (Mathf.Abs(explosionFactor - target) < 0.01f)
            {
                explosionFactor = target;
                isMoving = false;
            }

            if (explosionSlider != null)
                explosionSlider.value = explosionFactor;
        }

        // 根据 explosionFactor 计算每个子物体位置
        foreach (var item in childMeshRenderers)
        {
            Vector3 target = Vector3.Lerp(item.originalPosition, item.explodedPosition, explosionFactor);
            item.meshRenderer.transform.position = Vector3.Lerp(item.meshRenderer.transform.position, target, explosionSpeed);
        }

        // 控制 Canvas 状态
        UpdateCanvasState();
    }

    /// <summary>
    /// 切换展开视图（由 Q 键触发）
    /// </summary>
    public void ToggleExplodedView()
    {
        isInExplodedView = !isInExplodedView;
        isMoving = true;

        // 展开时先隐藏 Canvas
        if (isInExplodedView)
        {
            foreach (GameObject CanvasObj in AllCanvas)
                CanvasObj.SetActive(false);
        }
    }

    /// <summary>
    /// 当滑动条值改变时调用（实时控制）
    /// </summary>
    public void OnSliderValueChanged(float value)
    {
        explosionFactor = value;

        // 如果是手动滑动，就认为是用户控制状态
        isInExplodedView = explosionFactor >= 0.5f;
        isMoving = false;

        UpdateCanvasState();
    }

    /// <summary>
    /// 控制 Canvas 显示/隐藏与浮动
    /// </summary>
    private void UpdateCanvasState()
    {
        // 当爆炸程度大于 0.8 时显示 Canvas，否则隐藏
        bool shouldShow = explosionFactor > 0.8f;

        foreach (GameObject CanvasObj in AllCanvas)
        {
            if (CanvasObj.activeSelf != shouldShow)
            {
                CanvasObj.SetActive(shouldShow);

                TextMeshProUGUI name = CanvasObj.GetComponentInChildren<TextMeshProUGUI>();
                if (name != null)
                    name.text = CanvasObj.name;

                // 上下浮动动画
                Vector3 pos = CanvasObj.transform.position;
                if (shouldShow)
                    CanvasObj.transform.position = new Vector3(pos.x, pos.y + 1f, pos.z);
                else
                    CanvasObj.transform.position = new Vector3(pos.x, pos.y - 1f, pos.z);
            }
        }
    }
}