using System;
using UnityEngine;
using BITKit;
using BITKit.Entities;

namespace BITFALL
{
    public interface IPlayerInventoryWeightable
    {
        event Action<double,double> OnWeighted;
    }
    [CustomType(typeof(IPlayerInventoryWeightable))]
    public class InventoryWeightable : EntityComponent,IPlayerInventoryWeightable
    {
        [Header(Constant.Header.Data)]
        public double currentWeight;
        [Header(Constant.Header.Settings)]
        public double maxWeight =8;
        [Header(Constant.Header.InternalVariables)]
        private IBasicItemContainer container;
        public override void OnStart()
        {
            base.OnStart();
            container = entity.Get<IBasicItemContainer>();
            container.AddFactory += AddFactory;
            container.OnAdd += OnAdd;
            container.OnUsed += OnRemove;
            container.OnRemove += OnRemove;
            
            var playerEquipContainer = entity.Get<IPlayerEquipContainer>();
            playerEquipContainer.OnEquip += OnEquip;
            playerEquipContainer.OnDeEquip += DeEquip;
        }

        private bool AddFactory(IBasicItem item)
        {
            var asset = item.GetAssetable();
            if (!asset.TryGetProperty<ItemWeight>(out var itemWeight)) return true;
            return currentWeight + itemWeight <= maxWeight;
        }

        private void OnAdd(IBasicItem item)
        {
            var asset = item.GetAssetable();
            if (!asset.TryGetProperty<ItemWeight>(out var itemWeight)) return;
            currentWeight += itemWeight;
            InvokeCallback();
        }
        private void OnRemove(IBasicItem item)
        {
            var asset = item.GetAssetable();
            if (!asset.TryGetProperty<ItemWeight>(out var itemWeight)) return;
            currentWeight -= itemWeight;
            InvokeCallback();

        }

        private void DeEquip(IEquipmentSlot slot, IBasicItem item)
        {
            if (!item.GetAssetable().TryGetProperty<AddInventoryMaxWeight>(out var addWeight)) return;
            maxWeight -= addWeight.AddWeight;
            InvokeCallback();
        }

        private void OnEquip(IEquipmentSlot slot, IBasicItem item)
        {
            if (!item.GetAssetable().TryGetProperty<AddInventoryMaxWeight>(out var addWeight)) return;
            maxWeight += addWeight.AddWeight;
            InvokeCallback();
        }
        private void InvokeCallback()
        {
            OnWeighted?.Invoke(currentWeight, maxWeight);
        }
        public event Action<double,double> OnWeighted;
    }
}