using Thousandto.Core.Asset;
using Thousandto.Core.Base;
using Thousandto.Core.PostEffect;
using System.Collections.Generic;
using UnityEngine;

namespace Thousandto.Plugins.Common.UniScene
{
    //摄像机管理器
    public class CameraManager
    {
        #region//常量
        public const string CameraRootName = "[Cameras]";
        public const string NormalCameraName = "NormalCamera";
        #endregion

        #region//私有变量
        //根节点
        private Transform _camerasRoot = null;
        //摄像机列表
        private List<Camera> _sceneCamList = new List<Camera>();
        //摄像机控制器
        private CameraControl _sceneCameraControl = null;
        //上一个摄像机
        private Camera _oldCamera = null;
        //当前摄像机
        private Camera _curCamera = null;
        //当前的切换脚本
        private CameraBlendRender _blendScript = null;
        #endregion

        #region//属性
        //根节点
        public Transform CamerasRoot
        {
            get
            {
                return _camerasRoot;
            }
        }
        public Camera OldCamera
        {
            get
            {
                return _oldCamera;
            }
        }
        public Camera CurCamera
        {
            get
            {
                return _curCamera;
            }
        }
        public CameraControl SceneCameraControl
        {
            get
            {
                return _sceneCameraControl;
            }
        }
        public List<Camera> SceneCamList
        {
            get
            {
                return _sceneCamList;
            }
        }
        #endregion

        #region//公有函数
        //初始化
        public void Initialize()
        {
            _sceneCamList.Clear();
            var sceneRoot = GameObject.Find("SceneRoot");
            _camerasRoot = sceneRoot.transform.Find(CameraRootName);
            if (_camerasRoot != null)
            {
                for (int i = 0; i < _camerasRoot.childCount; ++i)
                {
                    var camera = _camerasRoot.GetChild(i).GetComponent<Camera>();
                    if (camera != null)
                    {
                        camera.allowHDR = false;
                        camera.allowMSAA = false;
                        camera.useOcclusionCulling = false;
                        camera.allowDynamicResolution = false;
                        camera.usePhysicalProperties = false;
                        UnityUtils.Reset(camera.transform);
                        _sceneCamList.Add(camera);

                        var audio = camera.GetComponent<AudioListener>();
                        if(audio != null)
                        {
                            GameObject.DestroyImmediate(audio);
                        }
                    }
                }
            }

            //创建默认摄像机
            {
                if (_camerasRoot == null)
                {
                    var camerasGo = new GameObject(CameraRootName);
                    _camerasRoot = camerasGo.transform;
                    _camerasRoot.parent = sceneRoot.transform;
                }

                //创建摄像机
                var cameraGo = new GameObject(NormalCameraName);
                cameraGo.transform.parent = _camerasRoot;
                UnityUtils.Reset(cameraGo.transform);
                var camera = UnityUtils.RequireComponent<Camera>(cameraGo);
                _sceneCamList.Add(camera);
                camera.allowHDR = false;
                camera.allowMSAA = false;
                camera.useOcclusionCulling = false;
                camera.allowDynamicResolution = false;
                camera.usePhysicalProperties = false;
            }

            _sceneCameraControl = UnityUtils.RequireComponent<CameraControl>(_camerasRoot.gameObject);
            _sceneCameraControl.FreeMode = false;
            _sceneCameraControl.FeatureHeight = 1.5f;
            //设置摄像机参数
            for (int i = 0; i < _sceneCamList.Count; ++i)
            {
                _sceneCamList[i].tag = "MainCamera";
                _sceneCamList[i].cullingMask = ~(LayerUtils.UI_Mask | LayerUtils.LayerToMask(LayerUtils.SceneChange1) | LayerUtils.LayerToMask(LayerUtils.SceneChange2));
                _sceneCamList[i].clearFlags = CameraClearFlags.Skybox;
                _sceneCamList[i].renderingPath = RenderingPath.Forward;
                _sceneCamList[i].gameObject.SetActive(false);
                UnityUtils.Reset(_sceneCamList[i].transform);
                
                if (_sceneCamList[i].gameObject.activeSelf)
                {
                   // _sceneCameraControl.SetCameraTrans(_sceneCamList[i].transform);
                }  
            }

            if(!_camerasRoot.gameObject.activeSelf)
            {
                _camerasRoot.gameObject.SetActive(true);
            }
        }
        //反初始化
        public void Uninitialize()
        {
            if(_oldCamera != null)
            {
                _oldCamera.targetTexture = null;
            }
            _oldCamera = null;

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

        //改变摄像机
        public bool ChangeCamera(string cameraName, bool blend = true, float blendTime = 1f)
        {
            var isFind = false;
            Camera camera = null;
            for (int i = 0; i < _sceneCamList.Count; ++i)
            {
                if(_sceneCamList[i].name == cameraName)
                {
                    camera = _sceneCamList[i];
                    //_sceneCameraControl.SetCameraTrans(_sceneCamList[i].transform);
                    isFind = true;
                    break;
                }
            }
            if (!isFind)
            {
                return false;
            }
            if (camera == null)
            {
                return false;
            }

            if (_curCamera != camera)
            {
                if (_blendScript != null)
                {
                    GameObject.Destroy(_blendScript);
                }
                _blendScript = null;

                if (blend)
                {
                    _oldCamera = _curCamera;
                    _curCamera = camera;
                    if (_oldCamera != null)
                    {
                        _blendScript = UnityUtils.RequireComponent<CameraBlendRender>(_curCamera.gameObject);
                        _blendScript.PlayBlend(_oldCamera, blendTime, () =>
                        {
                            GameObject.Destroy(_blendScript);
                            _blendScript = null;
                            _oldCamera.gameObject.SetActive(false);
                        });
                    }
                }
                else
                {
                    _curCamera = camera;
                    _oldCamera = null;
                }
                PostEffectManager.Instance.ReInitialize(_curCamera);
                _sceneCameraControl.CurCamera = _curCamera;
                /*
                 * //需要时开启离屏特效,现在暂时不需要了
                if (_camerasRoot != null)
                {
                    Debug.LogError("Invoke:OnSceneCameraChanged::" + (_curCamera == null ? "NULL" : _curCamera.name));
                    _camerasRoot.gameObject.SendMessage("OnSceneCameraChanged", _curCamera, SendMessageOptions.DontRequireReceiver);
                }
                */
                for (int i = 0; i < _sceneCamList.Count; ++i)
                {
                    if (_oldCamera != null)
                    {
                        _sceneCamList[i].gameObject.SetActive(_sceneCamList[i].name == cameraName || _sceneCamList[i].name == _oldCamera.name);
                    }
                    else
                    {
                        _sceneCamList[i].gameObject.SetActive(_sceneCamList[i].name == cameraName);
                    }
                }
            }
            return true;
        }

        public void LookTransform( Transform trans )
        {
            CurCamera.transform.position = trans.position;
            CurCamera.transform.rotation = trans.rotation;
            CurCamera.transform.Translate( new Vector3( 0, 0, -5 ), Space.Self );
        }
        #endregion
    }
}