using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;

namespace DDD
{
    public class InventoryView : MonoBehaviour, IEventHandler<InventoryChangedEvent>, IEventHandler<TodayMenuAddedEvent>, IEventHandler<TodayMenuRemovedEvent>
    {
        [SerializeField] private Transform _slotParent;
        
        private RestaurantManagementSo _restaurantManagementSo;
        private InventoryCategoryType _currenInventoryCategoryType = InventoryCategoryType.None;
        
        private readonly Dictionary<string, ItemSlotUi> _slotLookup = new();
        private GameObject _firstSlot;
        
        private const string ItemSlotUiName = "ItemSlotUi_";
        
        private void OnEnable()
        {
            EventBus.Register<InventoryChangedEvent>(this);
            EventBus.Register<TodayMenuAddedEvent>(this);
            EventBus.Register<TodayMenuRemovedEvent>(this);
        }

        private void OnDisable()
        {
            EventBus.Unregister<InventoryChangedEvent>(this);
            EventBus.Unregister<TodayMenuAddedEvent>(this);
            EventBus.Unregister<TodayMenuRemovedEvent>(this);
        }
        
        public GameObject GetInitialSelected() => _firstSlot;
        public async Task Initialize()
        {
            _restaurantManagementSo = await  AssetManager.LoadAsset<RestaurantManagementSo>(DataConstants.RestaurantManagementSo);
            Debug.Assert(_restaurantManagementSo != null, "_todayMenuDataSo != null");
            
            Clear();

            var models = ItemViewModelFactory.CreateRestaurantManagementInventoryItem();

            _slotLookup.Clear();
            foreach (var model in models)
            {
                var itemSlotUi = Instantiate(_restaurantManagementSo.ItemSlotUiPrefab, _slotParent);
                var slot = itemSlotUi.GetComponent<ItemSlotUi>();
                slot.Initialize(model, new InventorySlotUiStrategy());
                itemSlotUi.name = ItemSlotUiName + model.Id;

                var interactor = itemSlotUi.GetComponent<TodayMenuInteractor>();
                interactor.Initialize(TodayMenuEventType.Add);

                _slotLookup[model.Id] = slot;
            }
        }
        
        public void UpdateCategoryView(InventoryCategoryType category)
        {
            _currenInventoryCategoryType = category;

            _firstSlot = null;
            foreach (var kvp in _slotLookup)
            {
                var id = kvp.Key;
                var slot = kvp.Value;
                var model = slot.Model;

                // 1. 오늘의 메뉴에 등록된 경우 필터링
                bool isRegisteredTodayMenu = model.ItemType == ItemType.Recipe && _restaurantManagementSo.IsContainTodayMenu(id);

                // 2. 현재 선택된 카테고리에 맞는지 필터링
                bool matchCategory = MatchesCategory(model, _currenInventoryCategoryType);

                // 3. 조건을 모두 만족할 경우만 활성화
                bool shouldShow = !isRegisteredTodayMenu && matchCategory;
                slot.SetActive(shouldShow);

                if (shouldShow && _firstSlot == null)
                {
                    _firstSlot = slot.gameObject;
                }
            }
        }
        
        private bool MatchesCategory(ItemViewModel model, InventoryCategoryType category)
        {
            switch (category)
            {
                case InventoryCategoryType.Food:
                    if (model.ItemType != ItemType.Recipe) return false;
                    
                    return DataManager.Instance.RecipeDataSo.TryGetDataById(model.Id, out var foodRecipe) && foodRecipe.RecipeType == RecipeType.FoodRecipe;
                case InventoryCategoryType.Drink:
                    if (model.ItemType != ItemType.Recipe) return false;
                    
                    return DataManager.Instance.RecipeDataSo.TryGetDataById(model.Id, out var drinkRecipe) && drinkRecipe.RecipeType == RecipeType.DrinkRecipe;
                case InventoryCategoryType.Ingredient:
                    return model.ItemType == ItemType.Ingredient;
                default:
                    return false;
            }
        }

        public void UpdateView()
        {
            UpdateCategoryView(_currenInventoryCategoryType);
        }

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

        public void Invoke(TodayMenuAddedEvent evt)
        {
            UpdateView();
        }

        public void Invoke(TodayMenuRemovedEvent evt)
        {
            UpdateView();
        }

        public void Invoke(InventoryChangedEvent evt)
        {
            foreach (var slot in _slotLookup.Values)
            {
                if (slot.Strategy is InventorySlotUiStrategy inventorySlotUiStrategy)
                {
                    inventorySlotUiStrategy.OnInventoryChanged(slot);
                }
            }
        }
    }
}