using System;
using System.Collections;
using System.Collections.Generic;
using AibisDream.Kit;
using Cinemachine;
using DG.Tweening;
using DG.Tweening.Core;
using DG.Tweening.Plugins.Options;
using UnityEngine;
using UnityEngine.Rendering.Universal;
using Yarn.Unity;

namespace AibisDream.Framework
{
    public class CameraKit : SingletonBase<CameraKit>
    {
        private const int LowPriority = 1;
        private const int HighPriority = 10;

        #region 相机组件

        private CinemachineBrain _cameraBrain;
        private readonly Dictionary<CameraEnum, ICinemachineCamera> _virtualCameraDict = new();
        private readonly Dictionary<CameraEnum, CamState> _camInitStateDict = new();

        private CameraEnum _curCameraEnum;
        private CamState _curInitState;
        public Camera uiCamera;

        private struct CamState
        {
            public Vector3 pos;
            public float initOrthoSize;
        }

        #endregion

        private CameraKit()
        {
        }

        public override void OnSingletonInit()
        {
            _cameraBrain = Camera.main?.GetComponent<CinemachineBrain>();
            _curCameraEnum = CameraEnum.Default;
            
            // 获取UICamera
            if (Camera.main && Camera.main.TryGetComponent<UniversalAdditionalCameraData>(out var cameraData))
            {
                // 获取Stack Cameras
                var stackCameras = cameraData.cameraStack;

                // 获取UICamera
                uiCamera = stackCameras.Find(cam => cam && cam.name == "UI Camera");
            }
        }

        #region 相机信息注册

        /// <summary>
        /// 添加UI相机
        /// </summary>
        public void AddUICamera(Camera camera)
        {
            if (Camera.main && Camera.main.TryGetComponent<UniversalAdditionalCameraData>(out var cameraData))
            {
                cameraData.cameraStack.Add(camera);
            }
        }

        public void RemoveUICamera(Camera camera)
        {
            if (Camera.main && Camera.main.TryGetComponent<UniversalAdditionalCameraData>(out var cameraData))
            {
                cameraData.cameraStack.Remove(camera);
            }
        }

        public void RegisterCamera(CameraEnum camType, ICinemachineCamera virtualCamera)
        {
            _virtualCameraDict[camType] = virtualCamera;
            
            var initState = new CamState
            {
                pos = virtualCamera.VirtualCameraGameObject.transform.localPosition,
                initOrthoSize = virtualCamera.VirtualCameraGameObject.gameObject
                    .GetComponent<CinemachineVirtualCamera>().m_Lens.OrthographicSize
            };
            _camInitStateDict[camType] = initState;
        }

        public void UnRegisterCamera(CameraEnum camType, ICinemachineCamera virtualCamera)
        {
            if (!_virtualCameraDict.TryGetValue(camType, out var curCam)) return;

            if (virtualCamera == curCam)
            {
                _virtualCameraDict.Remove(camType);
                _camInitStateDict.Remove(camType);
            }
        }

        public void UnRegisterCamera(CameraEnum camType)
        {
            _virtualCameraDict.Remove(camType);
            _camInitStateDict.Remove(camType);
        }

        public void RemoveAllCam()
        {
            _virtualCameraDict.Clear();
            _camInitStateDict.Clear();
        }

        #endregion

        /// <summary>
        /// 检查当前是否需要切相机
        /// </summary>
        /// <param name="targetCameraState"></param>
        /// <returns>是就不用切相机</returns>
        public bool EqualToCameraState(CameraEnum targetCameraState)
        {
            return _curCameraEnum == targetCameraState;
        }

        /// <summary>
        /// 切换相机
        /// </summary>
        /// <param name="camType"></param>
        public IEnumerator SwitchCamera(CameraEnum camType)
        {
            Debug.Log("Camera Type is:"+camType);
            if (_curCameraEnum == camType)
            {
                yield break;
            }
            
            if (!_virtualCameraDict.ContainsKey(camType))
            {
                Debug.Log($"{camType.ToString()}相机未注册");
                yield break;
            }

            foreach (var camPair in _virtualCameraDict)
            {
                if (camPair.Key == camType) camPair.Value.Priority = HighPriority;
                if (camPair.Key != camType) camPair.Value.Priority = LowPriority;
            }

            _curInitState = _camInitStateDict[camType];
            yield return new WaitForSeconds(_cameraBrain.m_DefaultBlend.BlendTime);
        }

        public Tween TransCamera(Vector3 targetPos, float targetOrthographicSize, float duration)
        {
            // 寻找现在正在激活的相机
            var curCamera = _cameraBrain.ActiveVirtualCamera;

            var sq = DOTween.Sequence();
            // 移动
            sq.Join(curCamera.DOLocalMove(targetPos, duration));
            // 缩放
            sq.Join(curCamera.DOOrthoSize(targetOrthographicSize, duration));

            return sq;
        }

        public Tween ReturnInitCamera(float duration)
        {
            return TransCamera(_curInitState.pos, _curInitState.initOrthoSize, duration);
        }

        public IEnumerator TransCameraAsync(Vector3 targetPos, float duration)
        {
            var curCamera = _cameraBrain.ActiveVirtualCamera;
            yield return curCamera.DOLocalMove(targetPos, duration).WaitForCompletion();
        }

        public IEnumerator TransCameraAsync(Vector3 targetPos, float targetOrthographicSize, float duration)
        {
            yield return TransCamera(targetPos, targetOrthographicSize, duration).WaitForCompletion();
        }

        public IEnumerator ReturnInitCameraAsync(float duration)
        {
            yield return ReturnInitCamera(duration).WaitForCompletion();
        }

        // 方法已废弃，后面改成用Cinemachine的Shake
        [Obsolete]
        public IEnumerator ShakeCamera(float duration, float strength, int vibrate)
        {
            var curCamera = _cameraBrain.ActiveVirtualCamera;
            yield return curCamera.VirtualCameraGameObject.transform
                .DOShakePosition(duration, strength, vibrate, 90, false, false)
                .WaitForCompletion();
        }
    }

    public static class CinemachineExtension
    {
        public static TweenerCore<Vector3, Vector3, VectorOptions> DOLocalMove(this ICinemachineCamera camera,
            Vector3 targetPos, float duration)
        {
            var transform = camera.VirtualCameraGameObject.gameObject.transform;
            return transform.DOLocalMove(targetPos, duration);
        }

        public static TweenerCore<float, float, FloatOptions> DOOrthoSize(this ICinemachineCamera camera,
            float endValue, float duration)
        {
            var virtualCamera = camera.VirtualCameraGameObject.gameObject.GetComponent<CinemachineVirtualCamera>();
            var currentOrthoSize = virtualCamera.m_Lens.OrthographicSize;
            return DOTween.To(() => currentOrthoSize, x => currentOrthoSize = x, endValue, duration)
                .OnUpdate(() => virtualCamera.m_Lens.OrthographicSize = currentOrthoSize);
        }
    }

    public static class CameraCommand
    {
        [YarnCommand("return_init_camera")]
        public static IEnumerator ReturnInitCamera(float duration = 1f)
        {
            return CameraKit.Instance.ReturnInitCameraAsync(duration);
        }

        [YarnCommand("trans_camera")]
        public static IEnumerator TransCameraAsync(float x, float y, float targetOrthographicSize, float duration)
        {
            Vector3 targetPos = new Vector3(x, y, -10);
            return CameraKit.Instance.TransCameraAsync(targetPos, targetOrthographicSize, duration);
        }

        [YarnCommand("trans_camera_pos")]
        public static IEnumerator TransCameraAsync(float x, float y, float duration)
        {
            Vector3 targetPos = new Vector3(x, y, -10);
            return CameraKit.Instance.TransCameraAsync(targetPos, duration);
        }

        [YarnCommand("shake_camera")]
        public static IEnumerator ShakeCamera(float duration, float strength, int vibrate = 10)
        {
            return CameraKit.Instance.ShakeCamera(duration, strength, vibrate);
        }

        [YarnCommand("switch_camera")]
        public static IEnumerator SwitchCamera(string targetStateStr)
        {
            // 字符串转枚举
            if (!Enum.TryParse<CameraEnum>(targetStateStr, out var targetState))
            {
                Debug.Log($"{targetStateStr}不在FixState枚举中");
                yield break;
            }

            yield return CameraKit.Instance.SwitchCamera(targetState);
        }
    }

    public enum CameraEnum
    {
        Default,
        Clinic,
        CoolingMachine,
        BodyModule,
        Memory,
        Eye,
        UF,
        Expression,
        Engine,
        Gear,
        EyeDeep,
    }
}