using Data;
using Item;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace Managers
{
    public class ItemResourceManager : Utils.Singleton<ItemResourceManager>, ILaunchManager
    {
        private ItemResource defaultItem;
        private readonly Dictionary<string, Item.ItemResource> _items = new();
        private readonly Dictionary<string, List<Item.ItemResource>> _itemsByName = new(); // 保持按显示名称查找的字典

        public string StepDescription => "加载物品定义中";

        public void Init()
        {
            defaultItem = ItemResource.GetDefault();
            var baseItemDefs = Managers.DefineManager.Instance.QueryDefinesByType<ItemDef>();
            var weaponDefs = Managers.DefineManager.Instance.QueryDefinesByType<WeaponDef>();

            var allDefs = new List<ItemDef>();
            if (baseItemDefs != null) allDefs.AddRange(baseItemDefs);
            if (weaponDefs != null) allDefs.AddRange(weaponDefs);

            if (allDefs.Count == 0)
            {
                Debug.LogWarning("ItemResourceManager: No ItemDef or WeaponDef found to initialize.");
                return;
            }

            foreach (var def in allDefs)
            {
                if (_items.ContainsKey(def.defName))
                {
                    Debug.LogError(
                        $"ItemResourceManager: Duplicate itemDef.defName found: {def.defName}. Skipping this item.");
                    continue;
                }

                Item.ItemResource itemResource;

                if (def is WeaponDef currentWeaponDef)
                {
                    itemResource = new Item.WeaponResource(
                        currentWeaponDef
                    );
                }
                else
                {
                    itemResource = new Item.ItemResource(
                        def
                    );
                }

                _items.Add(def.defName, itemResource);
                if (!_itemsByName.ContainsKey(itemResource.Name))
                {
                    _itemsByName.Add(itemResource.Name, new List<Item.ItemResource>());
                }
                _itemsByName[itemResource.Name].Add(itemResource);
            }
        }

        public Item.ItemResource GetItem(string defName)
        {
            return _items.GetValueOrDefault(defName, null);
        }
        public Item.ItemResource FindItemByName(string itemName)
        {
            if (string.IsNullOrEmpty(itemName)) return null;
            return _itemsByName.GetValueOrDefault(itemName)?.FirstOrDefault();
        }

        public List<Item.ItemResource> FindAllItemsByName(string itemName)
        {
            if (string.IsNullOrEmpty(itemName)) return new List<Item.ItemResource>();
            return _itemsByName.GetValueOrDefault(itemName, new List<Item.ItemResource>());
        }

        public void Clear()
        {
            _items.Clear();
            _itemsByName.Clear();
        }
    }


}