using UnityEngine;
/// <summary>
/// 物体跟随鼠标移动
/// </summary>

namespace ZXK.GYJQR
{
    public class FollowMouse : MonoBehaviour
    {
        private bool _isFollow = false;
        public bool isFollow
        {
            get
            {
                return _isFollow;
            }
            set
            {
                _isFollow = value;
                if (_isFollow)
                {
                    Vector3 screenPos = Camera.main.WorldToScreenPoint(transform.position);
                    _cameraToGeoDistance = screenPos.z;
                    transform.GetComponent<Rigidbody>().useGravity = false;
                    transform.GetComponent<BoxCollider>().isTrigger = true;
                    _addForceNumber = 0;
                }
                IsLimitFollow = _isFollow;
            }
        }//是否跟随移动
        [System.NonSerialized]//摄像机和物体之间距离
        private float _cameraToGeoDistance = 0.1f;
        [HideInInspector]
        public PathManager pm;//当前物体上携带的路径动画组件
        [HideInInspector]
        public BoundTrigger _boundTrigger;//边缘检测对象

        //用于限制鼠标移动
        public float MaxLineLength = 1.0f;
        public bool IsLimitFollow = false;
        private int _addForceNumber = 0;//如果鼠标拖拽物体超出范围，给一次向内的力
        private void Start()
        {
            pm = GetComponent<PathManager>();
        }
        public void Update()
        {
            if (isFollow == false)
            {
                return;
            }
            Follow();

        }
        private void FixedUpdate()
        {
            if (IsLimitFollow && pm.limitCenterTran && _boundTrigger)
            {
                Vector3 mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, _cameraToGeoDistance);
                Vector3 mousePosGeo = Camera.main.ScreenToWorldPoint(mousePos);
                float mouseDistance = Vector3.Distance(mousePosGeo, pm.limitCenterTran.position);
                //WDebug.Log(mousePosGeo + "鼠标距离：" + mouseDistance);
                if (mouseDistance > pm.maxValue || mousePosGeo.y < pm.limitYPos)
                {
                    if (_boundTrigger)
                    {
                        _boundTrigger.onOutEdge?.Invoke();
                        if (!_boundTrigger.OnNearEdge(transform.tag) && _addForceNumber == 0)
                        {
                            _addForceNumber++;
                            Vector3 force = (pm.limitCenterTran.position - transform.position).normalized;
                            transform.GetComponent<Rigidbody>().AddForce(force * 15.0f);
                        }
                    }
                }
            }
        }
        /// <summary>
        /// 跟随鼠标移动函数
        /// </summary
        private void Follow()
        {
            Vector3 mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, _cameraToGeoDistance);
            transform.position = Camera.main.ScreenToWorldPoint(mousePos);
        }
    }
}