using System;
using SHJX.Service.Common.Logging;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Caching.Memory;

namespace SHJX.Service.Common.Utils
{
    /// <summary>
    /// 数据缓存工具类
    /// </summary>
    public class DataCache
    {
        private static DataCache _cache;
        private static readonly object obj_lock = new();
        private static readonly ILogger Logger = LogFactory.BuildLogger(typeof(DataCache));
        private static readonly MemoryCache cache = new(Options.Create(new MemoryCacheOptions()));
        private DataCache() { }

        public static DataCache Instance
        {
            get
            {
                if (_cache is null)
                {
                    lock (obj_lock)
                    {
                        _cache = new DataCache();
                    }
                }
                return _cache;
            }
        }

        /// <summary>
        /// 新增
        /// </summary>
        /// <typeparam name="T">缓存类型</typeparam>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        /// <param name="cacheTime">缓存时间（秒）</param>
        public void Set<T>(object key, T value, int cacheTime = 5)
        {
            cache.GetOrCreate(key, entry =>
            {
                entry.SetAbsoluteExpiration(TimeSpan.FromSeconds(cacheTime));
                entry.RegisterPostEvictionCallback((key, value, reason, state) =>
                {
                    Logger.LogInformation($"{value}已过期");
                });
                return value;
            });
        }

        /// <summary>
        /// 获取缓存中数据
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public T Get<T>(object key)
        {
            try
            {
                if (cache.TryGetValue(key, out var value))
                {
                    return (T)value;
                }
                return default;
            }
            catch (Exception)
            {
                return default;
            }
        }

        /// <summary>
        /// 移除缓存中的数据
        /// </summary>
        /// <param name="key"></param>
        public void Remove(object key)
        {
            if (cache.TryGetValue(key, out _))
            {
                cache.Remove(key);
            }
        }

        public int Count => cache.Count;
    }
}