using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using Bowin.Common.JSON;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.DependencyInjection;

namespace Bowin.Common.Cache
{
    public class MemoryCacheProvider : ICacheProvider
    {
        private IMemoryCache cache { get; set; }
        public MemoryCacheProvider()
        { }

        public MemoryCacheProvider(IMemoryCache _cache)
        {
            cache = _cache;
        }

        //private static MemoryCache cache
        //{
        //    get
        //    {
        //        return new MemoryCache(new MemoryCacheOptions { });
        //    }
        //}

        public void Config(IServiceCollection service)
        {
            service.AddMemoryCache();
        }
        public object Add(string key, object entry)
        {
            var result = Get(key);

            if (result != null)
            {
                cache.Remove(key);
            }
            using (var cacheEntry = cache.CreateEntry(key))
            {
                cacheEntry.AbsoluteExpiration = DateTime.Now.AddYears(2);
                cacheEntry.Value = entry;
            }
            result = entry;

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

            if (result != null)
            {
                cache.Remove(key);
            }
            using (var cacheEntry = cache.CreateEntry(key))
            {
                cacheEntry.AbsoluteExpiration = utcExpiry;
                cacheEntry.Value = entry;
            }
            result = entry;

            return result;
        }

        public object Get(string key)
        {
            object result;
            if (cache.TryGetValue(key, out result))
            {
                return result;
            }
            else
            {
                return null;
            }
        }

        public void Remove(string key)
        {
            cache.Remove(key);
        }
        public void Set(string key, object entry)
        {
            Add(key, entry);
        }

        public void Set(string key, object entry, DateTime utcExpiry)
        {
            Add(key, entry, utcExpiry);
        }
    }
}