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

namespace DDD
{
    public class TodayMenuView : MonoBehaviour, IEventHandler<TodayMenuAddedEvent>, IEventHandler<TodayMenuRemovedEvent>
    {
        [SerializeField] private Transform _todayFoodContent;
        [SerializeField] private Transform _todayDrinkContent;

        private List<ItemSlotUi> _foodSlots;
        private List<ItemSlotUi> _drinkSlots;

        private RestaurantManagementSo _restaurantManagementSo;

        private void Start()
        {
            _ = Initialize();
        }

        private void OnDestroy()
        {
            EventBus.Unregister<TodayMenuAddedEvent>(this);
            EventBus.Unregister<TodayMenuRemovedEvent>(this);
        }

        private async Task Initialize()
        {
            _restaurantManagementSo = await AssetManager.LoadAsset<RestaurantManagementSo>(DataConstants.RestaurantManagementSo);
            Debug.Assert(_restaurantManagementSo != null, "_restaurantManagementSo != null");
            
            foreach (Transform child in _todayFoodContent)
            {
                Destroy(child.gameObject);
            }

            int maxFoodCount = _restaurantManagementSo.MaxFoodCount;
            _foodSlots = new List<ItemSlotUi>(maxFoodCount);
            for (int i = 0; i < _restaurantManagementSo.MaxFoodCount; i++)
            {
                var go = Instantiate(_restaurantManagementSo.ItemSlotUiPrefab, _todayFoodContent);
                var slot = go.GetComponent<ItemSlotUi>();
                await slot.Initialize(null, new TodayMenuSlotUiStrategy(RecipeType.FoodRecipe));
                var todayMenuInteractor = go.GetComponent<TodayMenuInteractor>();
                todayMenuInteractor.Initialize(TodayMenuEventType.Remove);

                _foodSlots.Add(slot);
            }

            foreach (Transform child in _todayDrinkContent)
            {
                Destroy(child.gameObject);
            }

            int maxDrinkCount = _restaurantManagementSo.MaxDrinkCount;
            _drinkSlots = new List<ItemSlotUi>(maxDrinkCount);
            for (int i = 0; i < _restaurantManagementSo.MaxDrinkCount; i++)
            {
                var go = Instantiate(_restaurantManagementSo.ItemSlotUiPrefab, _todayDrinkContent);
                var slot = go.GetComponent<ItemSlotUi>();
                await slot.Initialize(null, new TodayMenuSlotUiStrategy(RecipeType.DrinkRecipe));
                var todayMenuInteractor = go.GetComponent<TodayMenuInteractor>();
                todayMenuInteractor.Initialize(TodayMenuEventType.Remove);

                _drinkSlots.Add(slot);
            }

            UpdateView();
            
            EventBus.Register<TodayMenuAddedEvent>(this);
            EventBus.Register<TodayMenuRemovedEvent>(this);
        }

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

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

        private void UpdateView()
        {
            int foodIndex = 0;
            foreach (var kvp in _restaurantManagementSo.FoodRecipeIds)
            {
                if (foodIndex >= _foodSlots.Count) break;

                string recipeId = kvp.Key;

                var model = ItemViewModelFactory.CreateByRecipeId(recipeId);
                var foodSlot = _foodSlots[foodIndex];
                _ = foodSlot.Initialize(model, new TodayMenuSlotUiStrategy(RecipeType.FoodRecipe));
                foodSlot.SetCount(kvp.Value);
                foodIndex++;
            }

            for (int i = foodIndex; i < _foodSlots.Count; i++)
            {
                _ = _foodSlots[i].Initialize(null, new  TodayMenuSlotUiStrategy(RecipeType.FoodRecipe));
            }

            int drinkIndex = 0;
            foreach (var kvp in _restaurantManagementSo.DrinkRecipeIds)
            {
                if (drinkIndex >= _drinkSlots.Count) break;

                string recipeId = kvp.Key;

                var model = ItemViewModelFactory.CreateByRecipeId(recipeId);
                var drinkSlot = _drinkSlots[drinkIndex];
                _ = drinkSlot.Initialize(model, new TodayMenuSlotUiStrategy(RecipeType.DrinkRecipe));
                drinkSlot.SetCount(kvp.Value);
                drinkIndex++;
            }

            for (int i = drinkIndex; i < _drinkSlots.Count; i++)
            {
                _ = _drinkSlots[i].Initialize(null, new   TodayMenuSlotUiStrategy(RecipeType.DrinkRecipe));
            }
        }
    }
}