using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

namespace DDD
{
    public class InventoryView : MonoBehaviour, IEventHandler<InventoryChangedEvent>
    {
        [SerializeField] private Transform _slotParent;
        [SerializeField] private GameObject _slotPrefab;
        
        private readonly Dictionary<string, IInventorySlotUi> _slotLookup = new();
        
        private void OnEnable()
        {
            EventBus.Register<InventoryChangedEvent>(this);
        }

        private void OnDisable()
        {
            EventBus.Unregister<InventoryChangedEvent>(this);
        }

        public void ShowItems(Func<ItemData, bool> predicate)
        {
            Clear();

            var models = ItemViewModelFactory.CreateRestaurantManagementInventoryItem(predicate);

            foreach (var model in models)
            {
                var go = Instantiate(_slotPrefab, _slotParent);
                var slot = go.GetComponent<IInventorySlotUi>();
                slot.Initialize(model);

                // 슬롯 참조 저장
                _slotLookup[model.Id] = slot;
            }

            if (_slotParent.childCount > 0)
            {
                EventSystem.current.SetSelectedGameObject(_slotParent.GetChild(0).gameObject);
            }
        }

        private void Clear()
        {
            foreach (Transform child in _slotParent)
            {
                Destroy(child.gameObject);
            }
        }

        public void Invoke(InventoryChangedEvent evt)
        {
            if (_slotLookup.TryGetValue(evt.ItemId, out var slot))
            {
                slot.UpdateCount(evt.NewCount);
            }
        }
    }
}