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

public class CMTranslucent : MonoBehaviour
{
    private Transform transformOfTargetObject;//目标物体
    private Vector3 offset;//摄像机对于角色的差量
    private Vector3 targetPosition;//计算后得到的摄像机位置
    private float speed = 5;//摄像机拉近速度
    private bool isCloser = false;//控制是否拉近
    private float dis;//用于记录当前距离，以判断是否达到不碰的临界
    List<GameObject> translucentObjList;
    List<GameObject> destryObjList;
    private float refreshTime = 0.5f;
    private float nowTime = 0;
    void Start()
    {
        translucentObjList = new List<GameObject>();
        destryObjList = new List<GameObject>();
        //初始化
        //transformOfTargetObject = GameObject.Find("Cube").GetComponent<Transform>();
        //offset = gameObject.transform.position - transformOfTargetObject.position;
        //dis = Vector3.Distance(gameObject.transform.position, transformOfTargetObject.position);
    }

    void Update()
    {
        nowTime += Time.deltaTime;
        if (nowTime < refreshTime)
        {
            return;
        }
        nowTime -= refreshTime;
        if (transformOfTargetObject == null)
        {
            if(HeroPlayerController.Instance.m_Hero != null)
            {
                transformOfTargetObject = HeroPlayerController.Instance.m_Hero.transform;
            }
            return;
        }
        destryObjList.Clear();
        foreach(var item in translucentObjList)
        {
            destryObjList.Add(item);
        }
        translucentObjList.Clear();
        //获得由物体射向摄像机的射线以及碰到的所有物体hits
        Vector3 dir = -(transformOfTargetObject.position - transform.position).normalized;
        RaycastHit[] hits;

        hits = Physics.RaycastAll(transformOfTargetObject.position, dir, Vector3.Distance(transformOfTargetObject.position, transform.position));
        if(hits.Length > 0)
        {
            for(int i = 0; i < hits.Length; ++i)
            {
                if (hits[i].collider.gameObject.layer != LayerMask.NameToLayer("Map"))
                {
                    continue;
                }
                Translucent(hits[i].collider.gameObject);
                translucentObjList.Add(hits[i].collider.gameObject);
                destryObjList.Remove(hits[i].collider.gameObject);
                //LogHelper.Log("摄像机与人物遮挡");
            }
        }
        // 销毁 不在碰撞内到 已碰撞过到遮挡对象
        ResetDestry();
        ////有碰到且物体没有移走，就拉近
        //if (hits.Length > 0 && dis > Vector3.Distance(gameObject.transform.position, transformOfTargetObject.position))
        //{
        //    isCloser = true;
        //}
        //else
        //{
        //    isCloser = false;
        //}
        //if (isCloser)
        //{
        //    //拉近
        //    gameObject.transform.position = Vector3.Lerp(gameObject.transform.position, hits[0].point, Time.deltaTime * speed); ;
        //    gameObject.transform.LookAt(transformOfTargetObject);
        //    isCloser = false;
        //}
        //else
        //{
        //    //正常跟随
        //    targetPosition = transformOfTargetObject.position + transformOfTargetObject.TransformDirection(offset);
        //    gameObject.transform.position = Vector3.Lerp(gameObject.transform.position, targetPosition, Time.deltaTime * speed);
        //    gameObject.transform.LookAt(transformOfTargetObject);
        //}

    }

    private void ResetDestry()
    {
        foreach(var obj in destryObjList)
        {
            MeshRenderer[] mrd = obj.GetComponentsInChildren<MeshRenderer>();
            foreach (var item in mrd)
            {
                Translucent tl;
                if (!item.gameObject.TryGetComponent<Translucent>(out tl))
                {
                    
                }
                if(tl)
                {
                    Destroy(tl);
                }
            }
        }
    }

    private void Translucent(GameObject obj)
    {
        MeshRenderer[] mrd = obj.GetComponentsInChildren<MeshRenderer>();
        foreach(var item in mrd)
        {
            Translucent tl;
            if (!item.gameObject.TryGetComponent<Translucent>(out tl))
            {
                tl = item.gameObject.AddComponent<Translucent>();
            }
        }
    }
}