using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
/*******************************************************************************
*Create By CG
*Function 右键按下旋转物体，左键按下平移摄像机，滚轮缩放摄像机远近
*******************************************************************************/
namespace CG.UTility
{
	public class CameraGeoCtrl : MonoBehaviour
	{
        /// <summary>
        /// 需要旋转的物体
        /// </summary>
        [SerializeField]
        private Transform _cenTran;
        private float _rotSpeed = 5.12f;// 256.0f;
        public float _RotSpeed { get => _rotSpeed/** ZXK.GYJQR.GameManager.Instance._CurMouseFlexible*/;}

        private float _moveSpeed = 0.06f;// 3.0f;
        public float _MoveSpeed { get => _moveSpeed /** ZXK.GYJQR.GameManager.Instance._CurMouseFlexible*/; }

        private float _zoomSpeed = 1.6f;// 80.0f;
        public float _ZoomSpeed { get => _zoomSpeed /** ZXK.GYJQR.GameManager.Instance._CurMouseFlexible*/; }

        private float _minZoom = 5.0f;
        private float _maxZoom = 100f;

        private float rotX = 0.0f;
        private float rotY = 0.0f;
        private float posX = 0.0f;
        private float posY = 0.0f;

        //是否禁止旋转
        [ReadOnly]
        public bool _RotForbid = false;


        private void OnEnable()
        {
            Vector3 angles = transform.eulerAngles;
            rotX = angles.y;
            rotY = angles.x;
            Vector3 pos = transform.localPosition;
            posX = pos.x;
            posY = pos.y;
        }
        private void Update()
        {
            if (!EventSystem.current.IsPointerOverGameObject())
            {
                SetCamDistance();
                SetCamPosition();
                if (!_RotForbid)
                {
                    SetCamRotation();
                }
            }
        }
        /// <summary>
        /// 设置摄像机镜头远近
        /// </summary>
        private void SetCamDistance()
        {
            //transform.localPosition += transform.forward * Input.mouseScrollDelta.y * Time.deltaTime * _ZoomSpeed;
            float zoom = transform.GetComponent<Camera>().fieldOfView;
            if (zoom < _minZoom && Input.mouseScrollDelta.y > 0 || zoom > _maxZoom && Input.mouseScrollDelta.y < 0)
            {
                return;
            }
            transform.GetComponent<Camera>().fieldOfView -= Input.mouseScrollDelta.y * Time.deltaTime * _ZoomSpeed;
        }

        private void SetCamPosition()
        {
            float mouse_x = Input.GetAxis("Mouse X");
            float mouse_y = Input.GetAxis("Mouse Y");
            if (Input.GetKey(KeyCode.Mouse1))
            {
                posX = mouse_x * _MoveSpeed * Time.deltaTime;
                posY = mouse_y * _MoveSpeed * Time.deltaTime;
                //WDebug.Log($"{posX}_{posY}");
                transform.Translate(new Vector3(-posX, -posY, 0), Space.Self);
            }
        }
        private void SetCamRotation()
        {
            float mouse_x = Input.GetAxis("Mouse X");
            float mouse_y = Input.GetAxis("Mouse Y");
            if (Input.GetKey(KeyCode.Mouse0))
            {
                //WDebug.Log("速度：" + _RotSpeed);
                rotX = mouse_x * _RotSpeed * Time.deltaTime;
                rotY = mouse_y * _RotSpeed * Time.deltaTime;
                //rotY = Mathf.Clamp(rotY, -90, 90);//防止翻跟头
                //Quaternion rotation = Quaternion.Euler(rotY, rotX, 0);//利用欧拉角防止万向锁
                //_cenTran.rotation = rotation;
                _cenTran.Rotate(new Vector3(0, -rotX, -rotY), Space.World);
            }
        }
    }
}