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

namespace Thousandto.Launcher.ExternalLibs
{
    public class ReflectEffectScript : MonoBehaviour
    {

        //目标材质索引
        [SerializeField]
        private int _EyeCorneaMatIndex = 0;
        [SerializeField]
        private int _ViewCullMask = -1;

        //摄像机
        private Camera _viewCamera;
        //材质
        private Material _m;
        //RenderTexture
        private RenderTexture _rt;

        private void OnEnable()
        {
            if (_rt == null) _rt = RenderTexture.GetTemporary(1136, 640, 24, RenderTextureFormat.ARGB32);
            _rt.antiAliasing = 1;
            _rt.name = "RenderTexture8";
            if (_m == null)
            {
                var r = GetComponent<Renderer>();
                if (r.sharedMaterials != null && r.sharedMaterials.Length > _EyeCorneaMatIndex && _EyeCorneaMatIndex > 0)
                {
                    _m = r.sharedMaterials[_EyeCorneaMatIndex];
                }
            }
            if (_viewCamera == null)
            {
                var trans = transform.Find("[ViewCamera]");
                GameObject go;
                if (trans == null)
                {
                    go = new GameObject("[ViewCamera]");
                    trans = go.transform;

                }
                else
                {
                    go = trans.gameObject;

                }

                trans.parent = transform;
                trans.localPosition = Vector3.zero;
                trans.localRotation = Quaternion.identity;

                //获取Camera组件
                _viewCamera = go.GetComponent<Camera>();
                if (_viewCamera == null)
                {
                    _viewCamera = go.AddComponent<Camera>();
                }
                _viewCamera.enabled = false;
                _viewCamera.clearFlags = CameraClearFlags.SolidColor;
                _viewCamera.backgroundColor = Color.black;
                _viewCamera.targetTexture = _rt;
                _viewCamera.transform.right = transform.right;
                if (_ViewCullMask >= 0) _viewCamera.cullingMask = _ViewCullMask;

                if (_m != null) _m.mainTexture = _rt;
                _viewCamera.Render();
            }
        }

        private void OnDestroy()
        {
            if (_rt != null)
            {
                RenderTexture.ReleaseTemporary(_rt);
                _rt = null;
                if (_m != null) _m.mainTexture = null;
            }

            if (_viewCamera != null)
            {
                GameObject.DestroyImmediate(_viewCamera.gameObject);
            }

        }
        // Update is called once per frame
        void Update()
        {
            if (_viewCamera != null)
            {
                _viewCamera.transform.right = transform.right;
                _viewCamera.Render();
            }
        }

        private void OnDrawGizmos()
        {
            Gizmos.DrawRay(transform.position, transform.right.normalized);
        }
    }
}