using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Caching;
using System.Web;

namespace Central.Control.WebApi.Cache
{
    /// <summary>
    /// 
    /// </summary>
    public class CacheHelper: ICacheHelper
    {
        private MemoryCache _cache = MemoryCache.Default;

        /// <summary>
        /// 此方法缓存不会过期，请谨慎使用
        /// </summary>
        /// <param name="key"></param>
        /// <param name="content"></param>
        public void SetByNotExpired<T>(string key, T content)
        {
            var policy = new CacheItemPolicy
            {
                AbsoluteExpiration = ObjectCache.InfiniteAbsoluteExpiration
            };
            _cache.Set(key, content, policy);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="content"></param>
        /// <param name="seconds"></param>
        public void Set<T>(string key, T content, int seconds = 300)
        {
            var policy = new CacheItemPolicy
            {
                AbsoluteExpiration = DateTime.Now.AddSeconds(seconds)
            };
            policy.AbsoluteExpiration = ObjectCache.InfiniteAbsoluteExpiration;
            // System.Runtime.Caching.ObjectCache.InfiniteAbsoluteExpiration
            _cache.Set(key, content, policy);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public T Get<T>(string key) where T : class
        {
            if (_cache.Contains(key))
            {
                return _cache[key] as T;
            }
            return null;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        public void Remove(string key)
        {
            _cache.Remove(key);
        }


    }
}