using System;
using System.Collections;
using DDD.Utility;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

public enum RendererFeatureName
    {
        None = 0,
        GrayscaleRenderPassFeature
    }

    public enum VolumeType
    {
        None = 0,
        Global,
        Player
    }
    
    public class PostProcessingManager : Singleton<PostProcessingManager>
    {
        [SerializeField]
        private Volume _globalVolume;
        
        [SerializeField]
        private Volume _playerVolume;
        
        [SerializeField]
        private UniversalRenderPipelineAsset _currentRenderPipeline;
        
        [SerializeField]
        private ScriptableRendererData _currentRenderData;
        
        private Coroutine _lowHpVignetteCoroutine;
        
        // LowHpVignette
        [Title("LowHpVignette")]
        [SerializeField]
        private bool _isLerpIntensity = true;

        [SerializeField]
        private float _startIntensity = 0.15f;

        [SerializeField, ShowIf("@_isLerpIntensity")]
        private float _endIntensity = 0.2f;

        [SerializeField, ShowIf("@_isLerpIntensity")]
        private float _lerpTime = 1f;

        protected override void OnAwake()
        {
            InitializeComponents();
        }

        protected override void OnApplicationQuit()
        {
            ToggleRendererFeature(RendererFeatureName.GrayscaleRenderPassFeature, false);
        }

        [Button("컴포넌트 초기화")]
        private void InitializeComponents()
        {
            _currentRenderPipeline = (UniversalRenderPipelineAsset)GraphicsSettings.currentRenderPipeline;
            _currentRenderData = _currentRenderPipeline.rendererDataList[0];
            _globalVolume = GetComponent<Volume>();
            _playerVolume = transform.Find("PlayerVolume").GetComponent<Volume>();
        }

        public void ToggleRendererFeature(RendererFeatureName featureName, bool value)
        {
            foreach (var element in _currentRenderData.rendererFeatures)
            {
                if (!string.Equals(element.name, featureName.ToString())) continue;
                
                element.SetActive(value);
                return;
            }
            
            Debug.Log($"{featureName}과 일치하는 기능이 없습니다.");
        }
        
        public void ToggleEffect<T>(bool value, VolumeType volumeType) where T : VolumeComponent
        {
            Volume currentVolume = null;
            switch (volumeType)
            {
                case VolumeType.None:
                    break;
                case VolumeType.Global:
                    currentVolume = _globalVolume;
                    break;
                case VolumeType.Player:
                    currentVolume = _playerVolume;
                    break;
                default:
                    throw new ArgumentOutOfRangeException(nameof(volumeType), volumeType, null);
            }

            if (!currentVolume)
            {
                Debug.LogError($"VolumeType : {volumeType}의 {currentVolume}이 존재하지 않습니다.");
                return;
            }
            
            var effect = GetEffect<T>(volumeType);
            if (!effect)
            {
                print(typeof(T) + "효과가 없습니다.");
                return;
            }
            effect.active = value;
        }

        private T GetEffect<T>(VolumeType volumeType) where T : VolumeComponent
        {
            Volume currentVolume = null;
            switch (volumeType)
            {
                case VolumeType.None:
                    break;
                case VolumeType.Global:
                    currentVolume = _globalVolume;
                    break;
                case VolumeType.Player:
                    currentVolume = _playerVolume;
                    break;
                default:
                    throw new ArgumentOutOfRangeException(nameof(volumeType), volumeType, null);
            }

            if (!currentVolume)
            {
                Debug.LogError($"VolumeType : {volumeType}의 {currentVolume}이 존재하지 않습니다.");
                return null;
            }
            
            currentVolume.profile.TryGet(out T effect);
            return effect;
        }
        
        public void LowHpVignette()
        {
            Utils.StartUniqueCoroutine(this, ref _lowHpVignetteCoroutine, LowHpVignetteCoroutine());
        }

        public void DefaultHpVignette()
        {
            Utils.EndUniqueCoroutine(this, ref _lowHpVignetteCoroutine);
            ToggleEffect<Vignette>(false, VolumeType.Player);
        }

        private IEnumerator LowHpVignetteCoroutine()
        {
            var vignette = GetEffect<Vignette>(VolumeType.Player);
            vignette.intensity.value = _startIntensity;
            vignette.active = true;
            
            if (!_isLerpIntensity) yield break;
            
            var elapsedTime = 0f;
            var addTime = Time.deltaTime;
            while (true)
            {
                vignette.intensity.value = Mathf.Lerp(_startIntensity, _endIntensity, elapsedTime / _lerpTime);
                if (elapsedTime > _lerpTime)
                {
                    addTime = -Time.deltaTime;
                }
                else if (elapsedTime < 0)
                {
                    addTime = Time.deltaTime;
                }
                elapsedTime += addTime;
                yield return null;
            }
        }

        public void DepthOfFieldButton(bool active) => ToggleEffect<DepthOfField>(active, VolumeType.Global);
    }