using System;
using System.Collections.Generic;
using System.Linq;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.Pool;

namespace BlueWater
{
    public class LiquidController : MonoBehaviour
    {
        #region Variables

        [Title("컴포넌트")]
        [SerializeField]
        private Renderer _renderTexture;
        
        [SerializeField]
        private Renderer _liquidRenderer;
        
        [SerializeField]
        private Collider2D _reachedCollider;
        
        [Title("스폰 데이터")]
        [SerializeField, Required]
        private Transform _spawnTransform;

        [SerializeField]
        private Transform _spawnLocation;

        [SerializeField]
        private Vector3 _pushDirection;

        [SerializeField]
        private float _pushPower;
        
        [Title("액체")]
        [SerializeField, Required, Tooltip("액체 프리팹")]
        private Liquid _liquidObject;
        
        [SerializeField, Tooltip("떨어지는 액체의 색상")]
        private Color _liquidColor = new(1f, 0.8431373f, 0f, 1f);

        [SerializeField, Tooltip("초당 생성되는 액체 수(ml)")]
        private int _liquidsPerSecond = 80;

        [SerializeField]
        private int _maxLiquidCount = 400;

        [SerializeField, Range(0f, 1f), Tooltip("목표 색상으로 변경되는데 걸리는 시간")]
        private float _colorLerpSpeed = 0.5f;

        [SerializeField, Range(1f, 5f), Tooltip("목표 색상 * 밝기")]
        private float _colorIntensity = 2f;
        
        [Title("오브젝트 풀링")]
        [SerializeField, Tooltip("오브젝트 풀링 최대 개수")]
        private int _objectPoolCount = 1000;
        
        private IObjectPool<Liquid> _objectPool;
        private List<Liquid> _activeLiquids = new();
        private Dictionary<Color, int> _colorCounts = new();
        private Material _instanceMaterial;
        
        private bool _isPouring;
        private float _startTime = float.PositiveInfinity;
        private int _instanceLiquidCount;
        private float _currentLiquidAmount;
        private float _liquidReachedTime;
        private float _timeInterval;
        private Color _currentMixedColor = Color.black;
        private Color _targetColor;

        // Hashes
        private static readonly int _liquidAmountHash = Shader.PropertyToID("_LiquidAmount");
        private static readonly int _liquidColorHash = Shader.PropertyToID("_LiquidColor");
        private static readonly int _renderTextureColorHash = Shader.PropertyToID("_Color");

        #endregion

        // Unity events
        #region Unity events

        private void Awake()
        {
            _objectPool = new ObjectPool<Liquid>(CreateObject, OnGetObject, OnReleaseObject, OnDestroyObject, maxSize: _objectPoolCount);
        }

        private void Start()
        {
            TycoonEvents.OnDrinkUiOpened += Initialize;
            TycoonEvents.OnDrinkUiClosed += ReleaseAllObject;
            
            _instanceMaterial = Instantiate(_liquidRenderer.material);
            _liquidRenderer.material = _instanceMaterial;
            
            _timeInterval = 1f / _liquidsPerSecond;
            _instanceMaterial.SetFloat(_liquidAmountHash, 0f);
        }

        private void Update()
        {
            if (_isPouring)
            {
                if (_instanceLiquidCount >= _maxLiquidCount)
                {
                    InActiveIsPouring();
                    return;
                }
                
                if (Time.time - _startTime >= _timeInterval)
                {
                    _objectPool.Get();

                    if (!_colorCounts.TryAdd(_liquidColor, 1))
                    {
                        _colorCounts[_liquidColor] += 1;
                    }

                    _startTime = Time.time;
                }
            }

            if (_liquidReachedTime + _colorLerpSpeed >= Time.time)
            {
                _currentMixedColor = Color.Lerp(_currentMixedColor, _targetColor, _colorLerpSpeed * Time.deltaTime);
                _instanceMaterial.SetColor(_liquidColorHash, _currentMixedColor * _colorIntensity);
            }
        }

        private void OnDestroy()
        {
            TycoonEvents.OnDrinkUiOpened -= Initialize;
            TycoonEvents.OnDrinkUiClosed -= ReleaseAllObject;
        }

        #endregion

        // Initialize methods
        #region Initialize methods

        public void Initialize()
        {
            _instanceLiquidCount = 0;
            _currentLiquidAmount = 0f;
            _currentMixedColor = _liquidColor;
            _instanceMaterial.SetColor(_liquidColorHash, _currentMixedColor * _colorIntensity);
        }

        #endregion

        // Object pooling system
        #region Object pooling system

        private Liquid CreateObject()
        {
            var instance = Instantiate(_liquidObject, _spawnTransform.position, Quaternion.identity, _spawnLocation);
            instance.SetManagedPool(_objectPool);
            return instance;
        }

        private void OnGetObject(Liquid liquid)
        {
            liquid.transform.position = _spawnTransform.position;
            liquid.transform.rotation = Quaternion.identity;
            liquid.gameObject.SetActive(true);
            _instanceLiquidCount++;
            liquid.Initialize(this, _reachedCollider, _liquidColor, _pushDirection.normalized * _pushPower);
            if (_renderTexture && _renderTexture.material.GetColor(_renderTextureColorHash) != _liquidColor)
            {
                _renderTexture.material.SetColor(_renderTextureColorHash, _liquidColor);
            }
            _activeLiquids.Add(liquid);
        }

        private void OnReleaseObject(Liquid liquid)
        {
            liquid.gameObject.SetActive(false);
            _activeLiquids.Remove(liquid);
        }

        private void OnDestroyObject(Liquid liquid)
        {
            Destroy(liquid.gameObject);
            _activeLiquids.Remove(liquid);
        }

        #endregion

        // Custom methods
        #region Custom methods
        
        [Button("기본 색상")]
        private void DefaultColor() => _liquidColor = new Color(1f, 0.8431373f, 0f, 1f);

        /// <summary>
        /// 술 제조 과정 초기화 함수
        /// </summary>
        public void ReleaseAllObject()
        {
            // 리스트 삭제는 뒤에서부터 해야 오류가 없음
            for (var i = _activeLiquids.Count - 1; i >= 0; i--)
            {
                _activeLiquids[i].Destroy();
            }
            
            _colorCounts.Clear();
            _instanceLiquidCount = 0;
            _currentLiquidAmount = 0f;
            _instanceMaterial.SetFloat(_liquidAmountHash, 0f);
        }

        public void ActiveIsPouring()
        {
            _startTime = Time.time;
            _isPouring = true;
        }

        public void InActiveIsPouring()
        {
            _isPouring = false;
        }
        
        /// <summary>
        /// 사용된 색상의 비율에 맞게 색을 혼합시키는 함수
        /// </summary>
        private Color MixColorsByTime()
        {
            var totalCounts = _colorCounts.Values.Sum();

            var mixedColor = Color.black;

            foreach (var element in _colorCounts)
            {
                var color = element.Key;
                var count = element.Value;
                var ratio = count / (float)totalCounts;

                mixedColor += color * ratio;
            }
            
            mixedColor.a = 1f;

            return mixedColor;
        }
        
        /// <summary>
        /// 액체가 특정 오브젝트에 충돌했을 때, 실행해야하는 과정
        /// </summary>
        public void OnLiquidReached()
        {
            _liquidReachedTime = Time.time;
            _currentLiquidAmount++;
            var liquidAmount = Mathf.Clamp(_currentLiquidAmount / _maxLiquidCount, 0f, 1f);
            _instanceMaterial.SetFloat(_liquidAmountHash, liquidAmount);
            _targetColor = MixColorsByTime();

            if (liquidAmount >= 1f)
            {
                InActiveIsPouring();
            }
        }

        #endregion
        
        
    }
}