using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Caching;
using Bowin.Common.JSON;

namespace Bowin.Common.Cache
{
    public class HttpCacheProvider : ICacheProvider
    {
        private static System.Web.Caching.Cache cache
        {
            get
            {
                return System.Web.HttpContext.Current.Cache;
            }
        }

        static HttpCacheProvider()
        {
        }

        public object Add(string key, object entry, DateTime utcExpiry)
        {
            var result = Get(key);

            if (result == null)
            {
                cache.Insert(key, entry, null, System.Web.Caching.Cache.NoAbsoluteExpiration, utcExpiry.Subtract(DateTime.Now),
                    CacheItemPriority.High, delegate { });
                result = entry;
            }

            return result;
        }

        public object Get(string key)
        {
            return cache[key];
        }

        public void Remove(string key)
        {
            cache.Remove(key);
        }

        public void Set(string key, object entry, DateTime utcExpiry)
        {
            var result = Get(key);

            if (result == null)
            {
                cache.Insert(key, entry, null, System.Web.Caching.Cache.NoAbsoluteExpiration, utcExpiry.Subtract(DateTime.Now),
                    CacheItemPriority.High, delegate { });
                result = entry;
            }
            else
            {
                cache[key] = entry;
            }
        }
    }
}