using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using BITFALL.Entities.Equipment;
using BITFALL.Entities.Inventory;
using BITFALL.Player.Inventory;
using UnityEngine;
using BITKit;
using BITKit.Entities;
using Cysharp.Threading.Tasks;

namespace BITFALL
{

    /// <summary>
    /// 玩家装备容器
    /// 支持，护甲，头盔和背包等
    /// </summary>
    [CustomType(typeof(IEntityEquipmentContainer))]
    public class EntityEquipmentContainer : EntityBehavior, IEntityEquipmentContainer
    {
        public IDictionary<IEquipmentSlot, IBasicItem> Equipment { get; } =
            new Dictionary<IEquipmentSlot, IBasicItem>();

        [Inject] private IEntityInventory _inventory;

        public override void OnAwake()
        {
            var health = UnityEntity.Get<IHealth>();
            health.OnSetAlive += OnSetAlive;
            _inventory.OnAdd += OnAdd;
            _inventory.AllowUseItemFactory += OnAllowUse;
        }

        private async void OnAdd(IBasicItem obj)
        {
            if (obj is null) return;
            var asset = obj.GetAssetable();
            if (asset.TryGetProperty<EquipmentAsSlot>(out var equipmentAsSlot) is false) return;
            if (Equipment.TryGetValue(equipmentAsSlot.slot, out _)) return;

            await UniTask.NextFrame();
            await UniTask.NextFrame();
            await UniTask.NextFrame();
            if(destroyCancellationToken.IsCancellationRequested) return;
            TryExecute(obj);
        }

        private bool OnAllowUse(IBasicItem arg)
        {
            return Equipment.Values.Any(x => x.Id == arg?.Id) ;
        }

        private void OnSetAlive(bool obj)
        {
            if (Data.Get<bool>(BITConstant.Environment.sp_keepInventory)) return;
            if (obj) return;
            foreach (var x in Equipment.ToArray())
            {
                OnDeEquip?.Invoke(x.Key, x.Value);
                _inventory.Add(x.Value);
            }

            Equipment.Clear();
        }

        public override void OnStart()
        {
            base.OnStart();
            _inventory.TryUseItemFactory += TryExecute;
        }

        public Action<IEquipmentSlot, IBasicItem> OnEquip { get; set; }
        public Action<IEquipmentSlot, IBasicItem> OnDeEquip { get; set; }

        public bool TryDeEquip<T>(T slot) where T : IEquipmentSlot
        {
            if (!Equipment.TryGetAny(x => x.Key.GetType().IsInstanceOfType(slot), out var pair)) return false;
            if (_inventory.Add(pair.Value))
            {
                DeEquip(slot, pair.Value);
            }

            return false;
        }

        public bool TryUseEquip<T>(T slot) where T : IEquipmentSlot
        {
            return TryUseEquip(System.Activator.CreateInstance(typeof(T)) as IEquipmentSlot);
        }

        public bool TryUseEquip(IEquipmentSlot slot)
        {
            if (!Equipment.TryGetAny(x => x.Key.GetType().IsInstanceOfType(slot), out var pair)) return false;
            if (!Equipment.TryRemove(pair.Key)) return false;
            OnDeEquip?.Invoke(pair.Key, pair.Value);
            _inventory.UseItem(pair.Value);

            //自动补齐
            if (_inventory.TryGetItem(x => x.AddressablePath == pair.Value.AddressablePath, out var item))
            {
                Equip(pair.Key, item);
                _inventory.Remove(item);
            }
            
            return true;
        }

        private bool Equip(IEquipmentSlot slot, IBasicItem item)
        {
            if (Equipment.TryAdd(slot, item) is false) return false;
            OnEquip?.Invoke(slot, item);
            return true;
        }

        private bool DeEquip(IEquipmentSlot slot, IBasicItem item)
        {
            if (Equipment.TryRemove(slot) is false) return false;
            OnDeEquip?.Invoke(slot, item);
            return true;
        }

        public int Priority => 0;

        public bool TryExecute(IBasicItem value)
        {
            var asset = value.GetAssetable();
            //尝试获取可装备信息
            if (!asset.TryGetProperty<EquipmentAsSlot>(out var equipmentAsSlot)) return false;
            //已装备物品
            if (Equipment.TryGetValue(equipmentAsSlot.slot, out var current))
            {
                if (_inventory.Add(current) is false)
                    return false;
                Equipment.Remove(equipmentAsSlot.slot);
                OnDeEquip?.Invoke(equipmentAsSlot.slot, current);
            }
            //装配物品
            Equip(equipmentAsSlot.slot, value);
            _inventory.Remove(value);
            return true;
        }
    }
}