using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using BITKit;
using BITKit.Animations;
using BITKit.StateMachine;
using System.Linq;
using System.Security.Permissions;
using BITFALL;
using BITFALL.Entities.Equipment;
using BITFALL.Player.Equip;
using BITKit.Entities.Melee;
using BITKit.Entities.VFX;
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 AssetableItem item;
        
        [Header(Constant.Header.Components)]
        [SerializeField] public UnityAnimator animator;
        [SerializeField] protected EntityVFXPlayer vfxPlayer;
        [SerializeField] protected EntityAnimator entityAnimator;
        [SerializeField] private Renderer[] renderers;
        [SerializeField] protected Transform cameraTransform;
        
        [Header(Constant.Header.Services)]
        [SerializeReference,SubclassSelector] protected IMeleeService meleeService;
        
        public Core.Entites.IEntity Entity { get; set; }
        public Entity UnityEntity=>Entity as Entity;
        public IBasicItem Item { get; set; }

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

        public virtual void Entry()
        {
            AllowRendering.AddElement(this);
            inputActionGroup.allowInput.AddElement(this);

            if (entityAnimator)
                entityAnimator.enabled = true;
            if (vfxPlayer)
                vfxPlayer.enabled = true;

            var animName = animator.animator.GetCurrentAnimatorStateInfo(0).shortNameHash;
            animator.animator.Play(animName, -1, 0);
        }

        public virtual UniTask EntryAsync()
        {
            
            return UniTask.CompletedTask;
        }

        public virtual void Exit()
        {
            if (entityAnimator)
                entityAnimator.enabled = false;
            if (vfxPlayer)
                vfxPlayer.enabled = false;
            
            inputActionGroup.allowInput.RemoveElement(this);
        }
        public virtual UniTask ExitAsync()
        {
            AllowRendering.RemoveElement(this);
            if (cameraTransform is not null)
            {
                cameraTransform.localPosition = default;
                cameraTransform.localRotation = _initialCameraRotation;
            }
            return UniTask.CompletedTask;
        }

        public virtual void OnAwake()
        {
            AllowRendering.AddListener(x => renderers.ForEach(y =>
            {
                y.enabled = x;
                animator.enabled = x;
            }));
            AllowRendering.Invoke();
            if (cameraTransform is not null)
                _initialCameraRotation = cameraTransform.localRotation;
            Initialize();
            inputActionGroup.allowInput.Invoke();
        }

        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;
            if (item is not AssetableEquip equip) return;
            switch (eventName)
            {
                case "Melee":
                case "Attack":
                    meleeService.Melee(new MeleeCommand
                    {
                        PlayerId = Entity.Id,
                        Position = Transform.position,
                        Force = meleeForce * equip.MeleeForce,
                        Range = equip.MeleeRange,
                        Damage = equip.MeleeDamage
                    });
                    break;
                case "HeavyAttack":
                    meleeService.Melee(new MeleeCommand
                    {
                        PlayerId = Entity.Id,
                        Position = Transform.position,
                        Force = meleeForce * equip.HeavyMeleeForce,
                        Range = equip.HeavyMeleeRange,
                        Damage = equip.HeavyMeleeDamage,
                    });
                    break;
            }
        }
    }
    [CustomType(typeof(IEquipService))]
    [CustomType(typeof(IEntityEquipment))]
    public class EntityEquipment : EntityComponent,IEquipService,IEntityEquipment
    {
        public IOptional<float> Zoom { get; } = new Optional<float>(){Value = 1};
        
        public float InitialFov;

        [SerializeField] private CinemachineVirtualCamera virtualCamera;

        [SerializeField] private Optional<int> overrideIndex;
        
        public event Action<IBasicItem> OnEquip;
        public event Action<IBasicItem> OnUnEquip;
        public event Action<string> OnEquipAddressable;
        public event Action<string> OnUnEquipAddressable;

        private readonly EntryGroup<IEquipBase> equips = new();
        protected IEquipBase entryComplete;
        private PlayerConfig playerConfig;

        private IBasicItem _currentItem;

        [Inject(true)] private IHealth _health;
        public override void OnAwake()
        {
            base.OnAwake();
            equips.list = GetComponentsInChildren<IEquipBase>(true).ToList();
            
            equips.OnEntry += OnEntry;
            equips.OnExit += OnExit;

            if (_health is not null)
            {
                _health.OnSetAlive += x =>
                {
                    if (x is false)
                        EntryEquip(-1);
                };
            }

            foreach (var x in equips.list)
            {
                x.Entity = entity;
                x.OnAwake();
            }
            
        }

        public override void OnStart()
        {
            base.OnStart();
            foreach (var x in equips.list)
            {
                x.OnStart();
            }
        }

        private void OnExit(IEquipBase obj)
        {
            OnUnEquipAddressable?.Invoke(obj.AddressablePath);
            OnUnEquip?.Invoke(obj.Item);
            //Debug.Log($"已退出:{obj.Item.Name}");
            obj.Item = null;
        }

        private void OnEntry(IEquipBase obj)
        {
            OnEquipAddressable?.Invoke(obj.AddressablePath);
            obj.Item = _currentItem;
            OnEquip?.Invoke(obj.Item);
            //Debug.Log($"已进入:{obj.Item.Name}");
        }

        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;
            }

            if (overrideIndex.Allow && (_health?.IsAlive ?? true))
            {
                EntryEquip(overrideIndex.Value);
            }
        }

        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));
        }
    }
}