using UnityEngine;
using UnityEngine.EventSystems;
public class ZhanShiCameraMove : MonoBehaviour

{


    [Header("旋转角度x,y缩放距离distance")] public float x, y, distance;
    [Header("X角度设置")] public float minYangle;
    public float maxYangle;
    [Header("缩放的最小距离")] public float distanceMin;

    [Header("缩放的最大距离")] public float distanceMax;

    [Header("需要注视的物体")] public Transform target;
    public static ZhanShiCameraMove instance;

    [Header("缩放的速度")] public float scrollSpeed;

    [Header("旋转的速度")] public float rotSpeed;

    // Start is called before the first frame update

    private void Start()

    {
        //初始化最开始位置
        instance = this;
        //   transform.LookAt(target);
        isAutoRotate = false;
        if (isAutoRotate)
        {

            Invoke("SetBool", 2f);


        }

    }


    /// <summary>
    /// 初始状态，延时两秒设置这个参数
    /// </summary>
    void SetBool()
    {

        isAutoRotate = true;
    }


    /// <summary>
    /// 更新一下参数
    /// </summary>
    /// <param name="x"></param>
    /// <param name="y"></param>
    /// <param name="distance"></param>
    public void SetData(float x, float y, float distance)
    {

        isAutoRotate = false;

        //目标物体旋转置空

        target.transform.rotation = new Quaternion(0, 0, 0, 0);

        //相机参数设置
        this.x = x;
        this.y = y;
        this.distance = distance;


        //根绝X，Y移动量计算旋转量
        this.y = Mathf.Clamp(this.y, minYangle, maxYangle);
        Quaternion rot = Quaternion.Euler(this.y, this.x, 0);
        transform.rotation = rot;
        //对距离进行区间运算，保证距离在最大和最小之间

        this.distance = Mathf.Clamp(this.distance, distanceMin, distanceMax);

        //根据距离值计算摄像机的位置

        Vector3 pos = rot * new Vector3(0, 0, -this.distance) + target.position;

        //更改摄像机位置为计算的值

        transform.position = pos;


        //延时旋转2秒后
        target.transform.localEulerAngles = Vector3.zero;
        Invoke("SetBool", 2f);


    }

    // Update is called once per frame

    private void Update()
    {
        if (isAutoRotate && !Input.GetMouseButton(1))
        {
            //   Debug.Log("测试到鼠标左键没按下");

            RotateModelContinuously(); // 持续旋转模型

        } // 如果鼠标左键没按下
        else
        {
            //target.transform.rotation = Quaternion.identity;

            Drag();

        }


        if (Input.GetAxis("Mouse ScrollWheel") != 0)

        {
            //根据滚轮的值计算距离

            distance = distance - Input.GetAxis("Mouse ScrollWheel") * scrollSpeed;
        }


        //对距离进行区间运算，保证距离在最大和最小之间

        distance = Mathf.Clamp(distance, distanceMin, distanceMax);

        //根据距离值计算摄像机的位置

        Vector3 pos = transform.rotation * new Vector3(0, 0, -distance) + target.position;

        //更改摄像机位置为计算的值

        transform.position = pos;
    }
    void RotateModelContinuously()
    {
        if (!isAutoRotatePivot)

            target.transform.Rotate(autoRotateDirection, autoRotationSpeed * Time.deltaTime * speed, Space.World);
        else
        {
            var rotateEuler = autoRotateDirection * autoRotationSpeed * Time.deltaTime * speed;
            // 根据模型当前朝向构造一个围绕轴旋转的四元数
            Quaternion deltaRotation = Quaternion.Euler(rotateEuler);
            // 将新的旋转应用到模型
            target.transform.rotation *= deltaRotation;

        }
    }

    void Drag()
    {
        if (Input.GetMouseButton(1))

        {


            //获取鼠标X轴移动量

            x = x + Input.GetAxis("Mouse X") * rotSpeed;

            //获取鼠标Y轴移动量

            y = y - Input.GetAxis("Mouse Y") * rotSpeed;




            //如果滚轮发生滚动


        }
        //根绝X，Y移动量计算旋转量
        y = Mathf.Clamp(y, minYangle, maxYangle);
        Quaternion rot = Quaternion.Euler(y, x, 0);

        //根据计算的旋转量旋转计算机

        transform.rotation = rot;


        if (Input.GetAxis("Mouse ScrollWheel") != 0)

        {
            //根据滚轮的值计算距离

            distance = distance - Input.GetAxis("Mouse ScrollWheel") * scrollSpeed;
        }


        //对距离进行区间运算，保证距离在最大和最小之间

        distance = Mathf.Clamp(distance, distanceMin, distanceMax);

        //根据距离值计算摄像机的位置

        Vector3 pos = rot * new Vector3(0, 0, -distance) + target.position;

        //更改摄像机位置为计算的值

        transform.position = pos;
    }

    [SerializeField]
    [Header("是否自动旋转")]
    private bool isAutoRotate;
    [SerializeField]
    [Header("是否按照自身坐标系轴自动旋转")]
    private bool isAutoRotatePivot;
    [SerializeField]
    [Header("自动旋转方向，例如(0,1,0)按照Y轴旋转")]
    private Vector3 autoRotateDirection;
    [SerializeField]
    [Header("自动旋转速度")]
    private float autoRotationSpeed = 5;
    [SerializeField]
    [Header("速度")]
    private float speed = 5f;
}