using System.Collections;
using BlueWater.Utility;
using Sirenix.OdinInspector;
using Unity.Cinemachine;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace BlueWater
{
    public class CombatCameraManager : Singleton<CombatCameraManager>
    {
        // Components
        #region Components
        
        [Title("카메라")]
        [SerializeField]
        private Transform _cinemachineCameras;
        
        [field: SerializeField]
        public CinemachineCamera BaseCombatCamera { get; private set; }

        public Camera MainCamera;
        
        // Variables
        private Vignette _vignette;
        private Coroutine _lowHpVignetteCoroutine;
        
        #endregion

        // Unity events
        #region Unity events
        
        protected override void OnAwake()
        {
            Initialize();
        }
        
        private void Start()
        {
            if (!GameManager.Instance) return;
            
            GameManager.Instance.OnInstantiateCombatPlayer += SetFollow;
        }

        private void OnDestroy()
        {
            if (!GameManager.Instance) return;
            
            GameManager.Instance.OnInstantiateCombatPlayer -= SetFollow;
        }

        #endregion

        // Initialize methods
        #region Initialize methods
        
        private void Initialize()
        {
            _cinemachineCameras = GameObject.Find("CinemachineCameras").transform;
            BaseCombatCamera = _cinemachineCameras.Find("BaseCombatCamera").GetComponent<CinemachineCamera>();

            BaseCombatCamera.Priority = 1;

            MainCamera = Camera.main;
            
            _vignette = GetEffect<Vignette>();
            _vignette.active = false;
        }

        #endregion

        // Methods
        #region Methods
        
        public void SetFollow(Transform target)
        {
            BaseCombatCamera.Follow = target;
        }
        
        // public void SetFollowAndLookAt(Transform target)
        // {
        //     BaseCombatCamera.Follow = target;
        //     BaseCombatCamera.LookAt = target;
        // }

        #endregion
        
        // PostProcessing
        #region PostProcessing
        
        public void ToggleEffect<T>(bool value) where T : VolumeComponent
        {
            var effect = GetEffect<T>();
            if (effect == null)
            {
                print(typeof(T) + "효과가 없습니다.");
                return;
            }
            effect.active = value;
        }

        private T GetEffect<T>() where T : VolumeComponent
        {
            var postProcessVolume = FindAnyObjectByType<Volume>();
            if (postProcessVolume == null)
            {
                print("Volume 컴포넌트를 가진 오브젝트가 없습니다.");
                return null;
            }
            postProcessVolume.profile.TryGet(out T effect);
            return effect;
        }

        public void LowHpVignette()
        {
            _lowHpVignetteCoroutine ??= StartCoroutine(LowHpVignetteCoroutine());
        }

        public void DefaultHpVignette()
        {
            Utils.EndUniqueCoroutine(this, ref _lowHpVignetteCoroutine);
            _vignette.active = false;
        }

        private IEnumerator LowHpVignetteCoroutine()
        {
            var startValue = 0.2f;
            var endValue = 0.3f;
            var time = 0f;
            
            _vignette.intensity.value = startValue;
            _vignette.active = true;
            
            while (true)
            {
                time += Time.deltaTime * 2f;
                _vignette.intensity.value = Mathf.Lerp(startValue, endValue, time);
                if (time >= 1f)
                {
                    (startValue, endValue) = (endValue, startValue);
                    time = 0f;
                }
                yield return null;
            }
        }

        #endregion
    }
}