using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using BITKit;
using BITKit.Entities;
using System;
using System.Linq;
using System.Threading;
using AYellowpaper.SerializedCollections;
using BITFALL.Entities.Inventory;
using BITKit.Entities.Slot;
using Cysharp.Threading.Tasks;

namespace BITFALL
{
    [CustomType(typeof(IEntityInventory))]
    [CustomType(typeof(IBasicItemContainer))]
    public class EntityInventory : EntityBehavior, IEntityInventory
    {
        /// <summary>
        /// 数据字典
        /// </summary>
        protected readonly Dictionary<int, IBasicItem> dictionary = new();
        /// <summary>
        /// 隐式接口实现
        /// </summary>
        public int Id => (int)UnityEntity.Id;

        public bool DropOrSpawn(IBasicItem item)
        {
            Drop(item);
            return true;
        }

        /// <summary>
        /// 工厂方法
        /// </summary>
        public event Func<IBasicItem, bool> AddFactory;
        public event Func<IBasicItem, bool> RemoveFactory;
        public event Func<IBasicItem, bool> DropFactory;
        // 回调
        public event Action<IBasicItem> OnAdd;
        public event Action<IBasicItem> OnUsedItem;
        public event Action<IBasicItem> OnRemove;
        public event Func<IBasicItem, bool> TryUseItemFactory;
        public event Func<IBasicItem, bool> AllowUseItemFactory;
        public event Action<IBasicItem> OnSet;
        public event Action<IBasicItem> OnDrop;
        public event Action<IBasicItemContainer> OnRebuild;
        public bool Clear(int id)
        {
            throw new NotImplementedException();
        }

        public bool TryUseItem(IBasicItem item)
        {
            if (dictionary.ContainsKey(item.Id) is false)
            {
                return false;
            }
            var isUsed=false;
            if (item.GetAssetable().TryGetProperty<ICustomItemBehavior>(out var customItemBehavior))
            {
                Entity.Inject(customItemBehavior);
                isUsed = customItemBehavior.TryUse(item);
            }
            return isUsed ||TryUseItemFactory is not null && TryUseItemFactory.CastAsFunc().Any(x => x.Invoke(item));
        }

        public bool AllowUseItem(IBasicItem item)
        {
            return AllowUseItemFactory.CastAsFunc().Any(func => func.Invoke(item));
        }

        public void UseItem(IBasicItem item)
        {
            if(item.GetAssetable().TryGetProperty<ICustomItemBehavior>(out var customItemBehavior))
            {
                customItemBehavior.OnUse(item); 
            }
            dictionary.TryRemove(item.Id);
            OnUsedItem?.Invoke(item);
        }

        public bool TrySetItem(IBasicItem item)
        {
            if (dictionary.TryGetValue(item.Id, out var currentItem) is false) return false;
            dictionary[item.Id] = item;
            OnSet?.Invoke(item);
            return true;
        }

        [Inject]
        protected IHealth _health;
        [Inject]
        protected IEntitySlot<Transform> _modelSlots;
        public override void OnAwake()
        {
            _health.OnSetAlive += OnSetAlive;
        } 
        protected virtual void OnSetAlive(bool alive)
        {
            if (alive) return;
            foreach (var x in dictionary.Values.ToArray())
            {
                OnRemove?.Invoke(x);
                Drop(x);
            }
            dictionary.Clear();
        }
        public virtual bool Add(IBasicItem item)
        {
            if (_health.IsAlive is false)
            {
                Drop(item);
                return true;
            }
            foreach (var func in AddFactory.CastAsFunc())
            {
                if (func.Invoke(item) is false)
                {
                    return false;
                }
            }
            if (!dictionary.TryAdd(item.Id, item)) return false;
            {
                OnAdd?.Invoke(item);
                return true;
            }
        }

        public virtual IBasicItem[] GetItems() => dictionary.Values.ToArray();
        public virtual bool Remove(IBasicItem item)
        {
            return Remove(item.Id);
        }

        public virtual bool Remove(int id)
        {
            if (!dictionary.TryGetValue(id, out var item)) return false;
            if (RemoveFactory is not null)
                if (RemoveFactory.GetInvocationList().Cast<Func<IBasicItem,bool>>().Any(x => x.Invoke(item) is false))
                {
                    return false;
                }

            dictionary.Remove(id);
            OnRemove?.Invoke(item);
            return true;
        }

        public virtual bool Remove(Func<IBasicItem, bool> removeFactory)
        {
            bool isRemoved = false;
            foreach (var x in dictionary.Values.ToArray())
            {
                if (removeFactory.Invoke(x))
                {
                    Remove(x.Id);
                    isRemoved = true;
                }
            }
            return isRemoved;
        }
        public bool TryGetItem(Func<IBasicItem, bool> func, out IBasicItem item)
        {
            return dictionary.Values.OrderBy(x=>x.TryGetProperty<ICount>(out var count)?count.Count:0).Reverse().TryGetAny(func, out item);
        }

        public bool Drop(int _Id)
        {
            if (!dictionary.TryGetValue(_Id, out var item)) return false;
            if (!Remove(item)) return false;
            if (DropFactory != null && DropFactory.GetInvocationList().Cast<Func<IBasicItem, bool>>()
                    .Any(x => x.Invoke(item) is false))
            {
                return false;
            }
            Drop(item);
            return true;
        }

        protected virtual void Drop(IBasicItem item)
        {
            OnDrop?.Invoke(item);
            var prefab = item.GetAssetable();
            var position = Transform.position + Vector3.up;
            var rotation = Transform.rotation;
            if (_modelSlots.Slots.TryGetValue(prefab.AddressablePath, out var anchor))
            {
                position = anchor.position;
                rotation = anchor.rotation;
            }
            var instance = Instantiate(prefab.GetPrefab(), position, rotation);
            instance.CopyItemsFrom(item);
            instance.WaitForInitializationComplete();
        }
        protected virtual void InvokeOnDrop(IBasicItem item)
        {
            OnDrop?.Invoke(item);
        }

        protected void RebuildInternal()
        {
            OnRebuild?.Invoke(this);
        }
    }
}