using System.Collections.Generic;
using System.Linq;

namespace cfg
{
    /// <summary>
    /// TbFishingEventCycleItem 的扩展方法
    /// 提供通过物品ID反向查询活动配置的能力
    /// </summary>
    public static class TbFishingEventCycleItemExtensions
    {
        // 按物品ID索引的缓存，用于反向查询
        private static Dictionary<int, FishingEventCycleItem> _itemIdIndex;
        private static readonly object _lock = new object();

        /// <summary>
        /// 初始化物品ID索引（在 Tables 初始化后调用）
        /// </summary>
        public static void BuildItemIdIndex(this TbFishingEventCycleItem table)
        {
            lock (_lock)
            {
                if (_itemIdIndex != null) return; // 已经初始化过

                _itemIdIndex = new Dictionary<int, FishingEventCycleItem>();

                foreach (var item in table.DataList)
                {
                    if (item.ItemId > 0)
                    {
                        // 如果有重复的 ItemId，使用第一个找到的
                        if (!_itemIdIndex.ContainsKey(item.ItemId))
                        {
                            _itemIdIndex[item.ItemId] = item;
                        }
                    }
                }

#if UNITY_EDITOR
                UnityEngine.Debug.Log($"[TbFishingEventCycleItemExtensions] Built item ID index with {_itemIdIndex.Count} entries");
#endif
            }
        }

        /// <summary>
        /// 根据物品ID查找对应的活动周期配置
        /// </summary>
        /// <param name="table">配置表实例</param>
        /// <param name="itemId">物品ID</param>
        /// <returns>活动周期配置，如果未找到返回 null</returns>
        public static FishingEventCycleItem FindByItemId(this TbFishingEventCycleItem table, int itemId)
        {
            // 确保索引已初始化
            if (_itemIdIndex == null)
            {
                table.BuildItemIdIndex();
            }

            return _itemIdIndex.TryGetValue(itemId, out var config) ? config : null;
        }

        /// <summary>
        /// 清空索引缓存（用于测试或重新加载配置时）
        /// </summary>
        public static void ClearItemIdIndex()
        {
            lock (_lock)
            {
                _itemIdIndex = null;
            }
        }
    }
}