using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HuanMeng.MiaoYu.Code.DataAccess;
using HuanMeng.MiaoYu.Model.DbSqlServer.Db_MiaoYu;
using Microsoft.Extensions.Caching.Memory;

namespace HuanMeng.MiaoYu.Code.Cache
{
    /// <summary>
    /// 人物信息缓存  
    /// </summary>
    public class CharacterInfoBaseCache
    {
        private  IMemoryCache _memoryCache;
        private object _cacheLock = new object(); // 用于线程安全的锁
        private const string CharactersCacheKey = "Characters";
        private DAO _dao;

        public CharacterInfoBaseCache(IMemoryCache memoryCache, DAO dao)
        {
            this._memoryCache = memoryCache;
            this._dao = dao;
        }

        public List<T_Character> GetCharacterFromCache(int userId)
        {
            lock (_cacheLock) // 加锁以防止并发访问
            {
                if (!_memoryCache.TryGetValue(CharactersCacheKey , out List<T_Character> cachedCharacter))
                {
                    // 如果缓存中没有数据，则从数据库中获取
                    //var db = new YourDbContext();
                    var character = _dao.daoDbMiaoYu.context.T_Character.ToList();
                    if (character != null && character.Count > 0)
                    {
                        // 将数据放入缓存
                        var cacheEntryOptions = new MemoryCacheEntryOptions()
                            .SetAbsoluteExpiration(TimeSpan.FromMinutes(30)) // 设置缓存过期时间
                            .SetSlidingExpiration(TimeSpan.FromMinutes(5)); // 设置滑动过期时间
                        _memoryCache.Set(CharactersCacheKey , character, cacheEntryOptions);
                        
                        cachedCharacter = character;
                    }
                    else
                    {
                        cachedCharacter = new List<T_Character>();
                    }
                }
                return cachedCharacter;
            }
        }
    }
}