using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ObjectOrbitController : MonoBehaviour
{
    #region 只有鼠标控制 没有触摸屏单指双指控制的逻辑（需添加）
    //[Header("旋转设置")]
    //[Range(50f, 500f)] public float rotateSpeed = 150f;
    //[Header("缩放设置")]
    //[Range(0.1f, 5f)] public float zoomSpeed = 0.5f;
    //[Range(0.1f, 10f)] public float minScale = 0.5f;
    //[Range(0.1f, 10f)] public float maxScale = 2f;

    //private Vector3 _initialScale; // 初始缩放
    //private Vector2 _lastMousePos; // 上一帧鼠标位置

    //private void Start()
    //{
    //    _initialScale = transform.localScale;
    //    isShuangZhi = false;
    //}
    //bool isShuangZhi;
    //private void Update()
    //{
    //    if (Input.touchCount == 2)
    //    {
    //        isShuangZhi = true;
    //    }
    //    // 1. 鼠标左键旋转物体
    //    if (Input.GetMouseButtonDown(0))
    //    {
    //        _lastMousePos = (Vector2)Input.mousePosition;
    //    }
    //    else if (Input.GetMouseButton(0))
    //    {
    //        Vector2 delta = (Vector2)Input.mousePosition - _lastMousePos;
    //        _lastMousePos = (Vector2)Input.mousePosition;

    //        // 绕Y轴（左右拖）、X轴（上下拖）旋转
    //        transform.Rotate(Vector3.up, -delta.x * rotateSpeed * Time.deltaTime, Space.World);
    //        transform.Rotate(Vector3.right, delta.y * rotateSpeed * Time.deltaTime, Space.World);
    //    }
    //    // 2. 滚轮缩放物体
    //    float scroll = Input.GetAxis("Mouse ScrollWheel");
    //    if (scroll != 0)
    //    {
    //        Vector3 newScale = transform.localScale + Vector3.one * scroll * zoomSpeed;
    //        // 限制缩放范围
    //        newScale = new Vector3(
    //            Mathf.Clamp(newScale.x, minScale, maxScale),
    //            Mathf.Clamp(newScale.y, minScale, maxScale),
    //            Mathf.Clamp(newScale.z, minScale, maxScale)
    //        );
    //        transform.localScale = newScale;
    //    }
    //}
    #endregion
    [Header("旋转速度")]
    [Range(50f, 500f)] public float rotateSpeed = 150f;
    [Header("缩放设置")]
    [Range(0.1f, 5f)] public float zoomSpeed = 0.5f;
    [Range(0.1f, 10f)] public float minScale = 0.5f;
    [Range(0.1f, 10f)] public float maxScale = 2f;

    private Vector3 _initialScale; // 初始缩放
    private Vector2 _lastMousePos; // 上一帧鼠标/触摸位置
    private float _lastTouchDistance; // 上一帧双指距离
    private bool _isFirstTouchInCurrentGesture; // 标记当前双指手势是否是首次触摸

    private void Start()
    {
        _initialScale = transform.localScale;
    }

    private bool isShuangZhi;

    private void Update()
    {
        // 处理触摸输入
        HandleTouchInput();

        // 处理鼠标输入（在没有触摸时生效）
        if (Input.touchCount == 0)
        {
            HandleMouseInput();
        }
    }

    /// <summary>
    /// 处理触摸屏输入
    /// </summary>
    private void HandleTouchInput()
    {
        // 单指触摸 - 旋转
        if (Input.touchCount == 1)
        {
            isShuangZhi = false;
            _isFirstTouchInCurrentGesture = true; // 重置双指手势标记
            Touch touch = Input.GetTouch(0);

            if (touch.phase == TouchPhase.Began)
            {
                _lastMousePos = touch.position;
            }
            else if (touch.phase == TouchPhase.Moved)
            {
                Vector2 delta = touch.position - _lastMousePos;
                _lastMousePos = touch.position;

                // 绕Y轴和X轴旋转（与鼠标控制逻辑一致）
                transform.Rotate(Vector3.up, -delta.x * rotateSpeed * Time.deltaTime, Space.World);
                transform.Rotate(Vector3.right, delta.y * rotateSpeed * Time.deltaTime, Space.World);
            }
        }
        // 双指触摸 - 缩放
        else if (Input.touchCount == 2)
        {
            isShuangZhi = true;
            Touch touch0 = Input.GetTouch(0);
            Touch touch1 = Input.GetTouch(1);

            // 仅在触摸移动时处理缩放
            if (touch0.phase == TouchPhase.Moved || touch1.phase == TouchPhase.Moved)
            {
                // 获取当前双指距离
                float currentDistance = Vector2.Distance(touch0.position, touch1.position);

                // 仅在当前双指手势的首次触摸时初始化距离（解决跳变问题）
                if (_isFirstTouchInCurrentGesture)
                {
                    _lastTouchDistance = currentDistance;
                    _isFirstTouchInCurrentGesture = false; // 标记为非首次
                }
                else
                {
                    // 双指张开→distanceDelta正→模型放大；双指收缩→distanceDelta负→模型缩小
                    float distanceDelta = currentDistance - _lastTouchDistance;
                    // 应用缩放（基于当前模型大小，而非重置）
                    Vector3 newScale = transform.localScale + Vector3.one * distanceDelta * 0.01f * zoomSpeed;
                    // 限制缩放范围
                    newScale = new Vector3(
                        Mathf.Clamp(newScale.x, minScale, maxScale),
                        Mathf.Clamp(newScale.y, minScale, maxScale),
                        Mathf.Clamp(newScale.z, minScale, maxScale)
                    );
                    transform.localScale = newScale;

                    // 更新上一帧距离（保留当前距离，用于下次计算）
                    _lastTouchDistance = currentDistance;
                }
            }
            // 双指离开时标记为"手势结束"，但保留_lastTouchDistance的值
            else if (touch0.phase == TouchPhase.Ended || touch1.phase == TouchPhase.Ended)
            {
                _isFirstTouchInCurrentGesture = true;
            }
        }
        else
        {
            isShuangZhi = false;
            // 移除「重置_lastTouchDistance为0」的逻辑 → 保留上次双指距离，避免跳变
            // _lastTouchDistance = 0; // 这行是导致跳变的核心原因，直接删除
            _isFirstTouchInCurrentGesture = true;
        }
    }

    /// <summary>
    /// 处理鼠标输入
    /// </summary>
    private void HandleMouseInput()
    {
        // 鼠标左键旋转
        if (Input.GetMouseButtonDown(1))
        {
            _lastMousePos = (Vector2)Input.mousePosition;
        }
        else if (Input.GetMouseButton(1))
        {
            Vector2 delta = (Vector2)Input.mousePosition - _lastMousePos;
            _lastMousePos = (Vector2)Input.mousePosition;

            transform.Rotate(Vector3.up, -delta.x * rotateSpeed * Time.deltaTime, Space.World);
            transform.Rotate(Vector3.right, delta.y * rotateSpeed * Time.deltaTime, Space.World);
        }

        // 鼠标滚轮缩放
        float scroll = Input.GetAxis("Mouse ScrollWheel");
        if (scroll != 0)
        {
            Vector3 newScale = transform.localScale + Vector3.one * scroll * zoomSpeed;
            newScale = new Vector3(
                Mathf.Clamp(newScale.x, minScale, maxScale),
                Mathf.Clamp(newScale.y, minScale, maxScale),
                Mathf.Clamp(newScale.z, minScale, maxScale)
            );
            transform.localScale = newScale;
        }
    }
}