using AUTS.Services.Enums;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Mvc;

namespace AUTS.Services.Extensions
{
    /// <summary>
    /// 缓存扩展
    /// </summary>
    public static class CacheExtensions
    {
        public static MvcHtmlString Cache(this HtmlHelper htmlHelper, string cacheName, Func<object> func, CacheTimeType cacheTimeType, int cacheTime)
        {
            if (!CacheExtensions.CheckCache(cacheName))
            {
                CacheExtensions.SetCache(cacheName, func().ToString(), cacheTimeType, cacheTime);
            }
            return MvcHtmlString.Create(CacheExtensions.GetCache<string>(cacheName));
        }

        /// <summary>
        /// 检查缓存名是否存在，如果存在则返回True
        /// </summary>
        /// <param name="cacheName">缓存的枚举类</param>
        public static bool CheckCache(string cacheName)
        {
            return HttpRuntime.Cache[cacheName.ToString()] != null;
        }

        /// <summary>
        /// 获取缓存，未做校验，每次取缓存的时候需要判断缓存是否存在
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="cacheName"></param>
        /// <param name="varName"></param>
        /// <returns></returns>
        public static T GetCache<T>(string cacheName)
        {
            return (T)((object)HttpRuntime.Cache[cacheName]);
        }

        public static T GetCacheWithSet<T>(string cacheName, Func<T> valueFunc, CacheTimeType cacheTimeType, int times)
        {
            if (!CacheExtensions.CheckCache(cacheName))
            {
                CacheExtensions.SetCache(cacheName, valueFunc(), cacheTimeType, times);
            }
            return CacheExtensions.GetCache<T>(cacheName);
        }

        public static T GetCacheWithSet<T>(string cacheName, Func<T> valueFunc)
        {
            if (!CacheExtensions.CheckCache(cacheName))
            {
                CacheExtensions.SetCache(cacheName, valueFunc());
            }
            return CacheExtensions.GetCache<T>(cacheName);
        }

        /// <summary>
        /// 获取缓存集合，未做校验，每次取缓存的时候需要判断缓存是否存在
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="cacheName"></param>
        /// <param name="varName"></param>
        /// <returns></returns>
        public static List<T> GetCacheList<T>(string cacheName)
        {
            return (List<T>)HttpRuntime.Cache[cacheName];
        }

        /// <summary>
        /// 设置缓存
        /// </summary>
        /// <param name="cacheName"></param>
        /// <param name="value"></param>
        /// <param name="cacheTimeType"></param>
        /// <param name="cacheTime"></param>
        public static void SetCache(string cacheName, object value, CacheTimeType cacheTimeType, int cacheTime)
        {
            switch (cacheTimeType)
            {
                case CacheTimeType.ByMinutes:
                    HttpRuntime.Cache.Insert(cacheName, value, null, DateTime.Now.AddMinutes((double)cacheTime), TimeSpan.Zero);
                    return;
                case CacheTimeType.ByHours:
                    HttpRuntime.Cache.Insert(cacheName, value, null, DateTime.Now.AddHours((double)cacheTime), TimeSpan.Zero);
                    return;
                case CacheTimeType.ByDays:
                    HttpRuntime.Cache.Insert(cacheName, value, null, DateTime.Now.AddDays((double)cacheTime), TimeSpan.Zero);
                    return;
                case CacheTimeType.ByYears:
                    HttpRuntime.Cache.Insert(cacheName, value, null, DateTime.Now.AddYears(cacheTime), TimeSpan.Zero);
                    return;
                default:
                    return;
            }
        }

        public static void SetCache(string cacheName, object value)
        {
            HttpRuntime.Cache.Insert(cacheName, value);
        }

        public static List<string> GetAllCache()
        {
            List<string> list = new List<string>();
            IDictionaryEnumerator enumerator = HttpRuntime.Cache.GetEnumerator();
            while (enumerator.MoveNext())
            {
                list.Add(enumerator.Key.ToString());
            }
            return list;
        }

        /// <summary>
        /// 清除指定缓存
        /// </summary>
        /// <param name="cacheName"></param>
        public static void ClearCache(string cacheName)
        {
            if (CacheExtensions.CheckCache(cacheName))
            {
                HttpRuntime.Cache.Remove(cacheName);
            }
        }

        /// <summary>
        /// 重置缓存
        /// </summary>
        /// <param name="cacheName"></param>
        /// <param name="value"></param>
        public static void RestCache(string cacheName, object value)
        {
            if (CacheExtensions.CheckCache(cacheName))
            {
                HttpRuntime.Cache[cacheName] = value;
                return;
            }
            CacheExtensions.SetCache(cacheName, value);
        }
    }
}