using System;
using CacheManager.Core;
using CacheManager.Core.Internal;

namespace Kreta.Framework.Caching
{
    public abstract class GenericCache<TCacheValueType> : Cache, IDisposable
    {
        private ICacheManager<TCacheValueType> cache;

        protected GenericCache(CacheManager cacheManager, string cacheName) : base(cacheManager)
        {
            cache = CacheFactory.FromConfiguration<TCacheValueType>(cacheName);

            cache.OnRemoveByHandle += Cache_OnRemoveByHandle;
        }

        protected bool Exists(string key)
        {
            return cache.Exists(key);
        }

        protected TCacheValueType Get(string key)
        {
            return cache.Get(key);
        }

        protected TCacheValueType GetByKeyAndRegion(string key, string region)
        {
            return cache.Get(key, region);
        }

        protected TCacheValueType GetOrAdd(string key, Func<string, TCacheValueType> valueFactory)
        {
            return cache.GetOrAdd(key, valueFactory);
        }

        protected bool Add(string key, string region, TCacheValueType value)
        {
            return cache.Add(key, value, region);
        }

        protected TCacheValueType GetOrAddWithRegion(string key, string region, Func<string, string, TCacheValueType> valueFactory)
        {
            return cache.GetOrAdd(key, region, valueFactory);
        }

        protected TCacheValueType AddOrUpdate(string key, TCacheValueType addValue, Func<TCacheValueType, TCacheValueType> updateValueFactory)
        {
            return cache.AddOrUpdate(key, addValue, updateValueFactory);
        }

        protected TCacheValueType AddOrUpdateWithRegion(string key, string region, TCacheValueType addValue, Func<TCacheValueType, TCacheValueType> updateValueFactory)
        {
            return cache.AddOrUpdate(key, region, addValue, updateValueFactory);
        }

        protected void Put(string key, TCacheValueType value)
        {
            cache.Put(key, value);
        }

        protected void PutWithRegion(string key, TCacheValueType value, string region)
        {
            cache.Put(key, value, region);
        }

        protected void Update(string key, Func<TCacheValueType, TCacheValueType> valueFactory)
        {
            cache.Update(key, valueFactory);
        }

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

        protected void RemoveFromRegion(string key, string region)
        {
            cache.Remove(key, region);
        }

        /// <summary>
        ///Clear the cache region, removeing all items from the specific region only
        /// </summary>
        /// <param name="region"></param>
        protected void ClearRegion(string region)
        {
            cache.ClearRegion(region);
        }

        protected void Expire(string key, ExpirationMode mode, TimeSpan timeout)
        {
            cache.Expire(key, mode, timeout);
        }

        protected void AddWithAbsoluteExpiration(string key, TimeSpan timeSpan, TCacheValueType value)
        {
            cache.Add(new CacheItem<TCacheValueType>(key, value, ExpirationMode.Absolute, timeSpan));

        }

        protected virtual void Cache_OnRemoveByHandle(object sender, CacheItemRemovedEventArgs e)
        {

        }

        public override void Reset()
        {
            cache.Clear();
        }

        bool disposed;

        protected virtual void Dispose(bool disposing)
        {
            if (!disposed && disposing)
            {
                if (cache != null)
                {
                    cache.Dispose();
                    cache = null;
                }
            }

            disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~GenericCache()
        {
            Dispose(false);
        }
    }
}