using System;
using System.Web;

namespace WX.CRM.Common
{
    public class CacheHelper
    {
        #region 判断Cache存在
        /// <summary>
        /// 判断cahce是否存在
        /// </summary>
        /// <param name="key">key</param>
        /// <returns></returns>
        public static bool Exists(string key)
        {
            bool result = false;
            if (HttpRuntime.Cache[key] != null)
            {
                result = true;
            }
            return result;
        }
        #endregion

        #region 获取Cache
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="key">Key</param>
        /// <returns></returns>
        public static T Get<T>(string key)
        {
            try
            {
                T t = (T)HttpRuntime.Cache[key];
                return t;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 尝试获取某个缓存
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static bool TryGet<T>(string key, ref T data)
        {
            try
            {
                data = (T)HttpRuntime.Cache[key];
                return data != null;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 设置Cache
        /// <summary>
        /// 设置缓存
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="key">key</param>
        /// <param name="t">value</param>
        public static void Set<T>(string key, T t)
        {
            HttpRuntime.Cache.Insert(key, t);
        }

        /// <summary>
        /// 设置缓存
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="key">key</param>
        /// <param name="t">value</param>
        /// <param name="expiresTime">过期时间</param>
        /// <param name="isXD">是否为相对过期时间</param>
        public static void Set<T>(string key, T t, DateTime expiresTime, bool isXD = true)
        {
            if (isXD)
                HttpRuntime.Cache.Insert(key, t, null, expiresTime, System.Web.Caching.Cache.NoSlidingExpiration);
            else
                HttpRuntime.Cache.Insert(key, t, null, expiresTime, TimeSpan.Zero);
        }

        /// <summary>
        /// 文件组依赖缓存
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="key">key</param>
        /// <param name="t">value</param>
        /// <param name="expiresTime">过期时间</param>
        /// <param name="filePath">文件组</param>
        public static void Set<T>(string key, T t, DateTime expiresTime, string[] filePaths)
        {
            HttpRuntime.Cache.Insert(key, t, new System.Web.Caching.CacheDependency(filePaths), expiresTime, TimeSpan.Zero);
        }

        /// <summary>
        /// 文件依赖缓存
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="key">key</param>
        /// <param name="t">value</param>
        /// <param name="expiresTime">过期时间</param>
        /// <param name="filePath">文件</param>
        public static void Set<T>(string key, T t, DateTime expiresTime, string filePath)
        {
            HttpRuntime.Cache.Insert(key, t, new System.Web.Caching.CacheDependency(filePath), expiresTime, TimeSpan.Zero);
        }
        #endregion

        #region 删除缓存
        public static void Remove(string key)
        {
            if (Exists(key))
            {
                HttpRuntime.Cache.Remove(key);
            }
        }
        #endregion

        #region 缓存处理
        static CacheHelper lockobj = new CacheHelper();
        /// <summary>
        /// 检查缓存是否存在
        /// 
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public static bool CheckTheCacheAndSava(string userName)
        {
            bool bExists = false;
            lock (lockobj)
            {
                bExists = HttpRuntime.Cache[userName] != null;
                if (!bExists)
                {
                    HttpRuntime.Cache.Add(userName, "1", null, DateTime.Now.AddSeconds(120), System.Web.Caching.Cache.NoSlidingExpiration,
                       System.Web.Caching.CacheItemPriority.High, null);
                }
            }
            return bExists;
        }



        public static void RemoveRegCache(string userName)
        {

            CacheHelper.Remove(userName);
        }

        #endregion
    }
}