using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using BITKit;
using BITKit.Animations;
using BITKit.StateMachine;
using System.Linq;
using BITFALL;
using BITFALL.Entities.Equipment;
using BITFALL.Player.Equip;
using BITKit.Entities.Melee;
using Cinemachine;
using Cysharp.Threading.Tasks;

namespace BITKit.Entities
{
    
    public abstract class BITEquipBase<T> : StateBasedMonoBehaviour<T>, IEquipBase where T : IState
    {
        [Header(Constant.Header.Settings)]
        [SerializeField] protected AssetableEquip item;
        
        [Header(Constant.Header.Components)]
        public UnityAnimator animator;
        [SerializeField] private Renderer[] renderers;
        
        [Header(Constant.Header.Services)]
        [SerializeReference,SubclassSelector] protected IMeleeService meleeService;
        
        public Core.Entites.IEntity Entity { get; set; }
        public IBasicItem Item { get; set; }

        public readonly InputActionGroup inputActionGroup = new()
        {
            allowGlobalActivation = true
        };
        protected readonly ValidHandle AllowRendering = new();
        public virtual string AddressablePath => throw new System.NotImplementedException();
        protected virtual Vector3 meleeForce => Transform.forward;
        public bool IsEntered { get; set; }

        public virtual void Entry()
        {
            AllowRendering.AddElement(this);
            inputActionGroup.allowInput.AddElement(this);
        }
        public virtual UniTask EntryAsync()
        {
            return UniTask.CompletedTask;
        }

        public virtual void Exit()
        {
            inputActionGroup.allowInput.AddElement(this);
        }
        public virtual UniTask ExitAsync()
        {
            AllowRendering.RemoveElement(this);
            return UniTask.CompletedTask;
        }
        public virtual void OnAwake()
        {
            AllowRendering.AddListener(x=>renderers.ForEach(y=>y.enabled = x));
            AllowRendering.Invoke();
            Initialize();
        }

        public virtual void OnDestroy()
        {
            inputActionGroup.Dispose();
        }

        public virtual void OnStart() { }
        public virtual void OnUpdate(float deltaTime) { }
        public virtual bool IsSupportItem(IBasicItem item) =>item is not null && item.AddressablePath == AddressablePath;

        public virtual void PlayAudio(string eventName) { }
        public virtual void EquipEvent(string eventName){}
        public virtual void AnimationEvent(string eventName)
        {
            if (IsEntered is false) return;
            switch (eventName)
            {
                case "Melee":
                case "Attack":
                    meleeService.Melee(new MeleeCommand
                    {
                        PlayerId = Entity.Id,
                        Position = Transform.position,
                        Force = meleeForce * item.MeleeForce,
                        Range = item.MeleeRange,
                        Damage = item.MeleeDamage
                    });
                    break;
                case "HeavyAttack":
                    meleeService.Melee(new MeleeCommand
                    {
                        PlayerId = Entity.Id,
                        Position = Transform.position,
                        Force = meleeForce * item.HeavyMeleeForce,
                        Range = item.HeavyMeleeRange,
                        Damage = item.HeavyMeleeDamage,
                    });
                    break;
            }
        }
    }
    [CustomType(typeof(IEquipService))]
    [CustomType(typeof(IEntityEquipment))]
    public class EntityEquipment : EntityComponent,IEquipService,IEntityEquipment
    {
        public EntryGroup<IEquipBase> equips = new();
        public IOptional<float> Zoom { get; } = new Optional<float>(){Value = 1};
        
        public float InitialFov;

        [SerializeField] private CinemachineVirtualCamera virtualCamera;
        
        public event Action<IBasicItem> OnEquip;
        public event Action<IBasicItem> OnDeEquip;
        
        protected IEquipBase entryComplete;
        private PlayerConfig playerConfig;

        private IBasicItem _currentItem;
        public override void OnStart()
        {
            base.OnStart();
            equips.list = GetComponentsInChildren<IEquipBase>(true).ToList();
            
            equips.OnEntry += OnEntry;
            equips.OnExit += OnExit;
            
            foreach (var x in equips.list)
            {
                x.Entity = entity;
                x.OnAwake();
            }
            foreach (var x in equips.list)
            {
                x.OnStart();
            }
        }

        private void OnExit(IEquipBase obj)
        {
            obj.Item = null;
            OnDeEquip?.Invoke(obj.Item);
        }

        private void OnEntry(IEquipBase obj)
        {
            obj.Item = _currentItem;
            OnEquip?.Invoke(obj.Item);
        }

        public override void OnUpdate(float deltaTime)
        {
            if (equips.TryGetEntried(out entryComplete))
            {
                entryComplete.OnUpdate(deltaTime);
            }

            if (virtualCamera is not null)
            {
                var current = virtualCamera.m_Lens.FieldOfView;
                current= Mathf.Lerp(current,Zoom.Allow ? InitialFov / Zoom.Value : PlayerConfig.Singleton.Fov , deltaTime * 5);
                current = Mathf.Clamp(current, 10, PlayerConfig.Singleton.Fov);
                virtualCamera.m_Lens.FieldOfView = current;
            }
        }

        public bool IsSupportItem(IBasicItem item)=> equips.list.Any(x => x.IsSupportItem(item));
        public void EntryEquip(int index)=> equips.Entry(index);

        public void EntryEquip(Func<string,bool> factory)=>equips.Entry(x=>factory.Invoke(x.AddressablePath));
        public void EntryEquip(IBasicItem item)
        {
            _currentItem = item;
            equips.Entry(x=>x.IsSupportItem(item));
        }
    }
}