using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using BITFALL.Player.Inventory;
using UnityEngine;
using BITKit;
using BITKit.Entities;

namespace BITFALL
{
  
    /// <summary>
    /// 玩家装备容器
    /// 支持，护甲，头盔和背包等
    /// </summary>
    [CustomType(typeof(IPlayerEquipContainer))]
    public class PlayerEquipContainer : EntityComponent, IPlayerEquipContainer
    {
        private readonly Dictionary<IEquipmentSlot, IBasicItem> dictionary = new();
        [Inject]
        private IBasicItemContainer inventory;
        public override void OnAwake()
        {
            var health = entity.Get<IHealth>();
            health.OnSetAlive += OnSetAlive;
        }

        private void OnSetAlive(bool obj)
        {
            if (obj) return;
            foreach (var x in dictionary.ToArray())
            {
                OnDeEquip?.Invoke(x.Key, x.Value);
                inventory.Add(x.Value);
            }
            dictionary.Clear();
        }

        public override void OnStart()
        {
            base.OnStart();
            inventory = entity.Get<IBasicItemContainer>();
            var playerInventory = entity.Get<IPlayerInventory>();
            playerInventory.OnUseItem += 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 (!dictionary.TryGetValue(slot, out var equipable)) return false;
            if (inventory.Add(equipable))
            {
                DeEquip(slot, equipable);
            }
            return false;
        }
        private bool Equip(IEquipmentSlot slot, IBasicItem item)
        {
            dictionary.Add(slot, item);
            OnEquip?.Invoke(slot, item);
            return true;
        }
        private bool DeEquip(IEquipmentSlot slot, IBasicItem item)
        {
            dictionary.Remove(slot);
            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 equipable)) return false;
            //已装备物品
            if (dictionary.TryGetValue(equipable.slot, out var equipedItem))
            {
                //尝试将装配放回背包
                if (inventory.Add(equipedItem))
                {
                    //移除已装备物品
                    DeEquip(equipable.slot, value);
                }
            }
            //从库存中移除物品
            if (inventory.Remove(value))
            {
                //装配物品
                Equip(equipable.slot, value);
            }
            return false;
        }
    }
}