using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Znyc.Recruitment.Admin.Commons.Cache
{
    /// <summary>
    ///     MemoryCache缓存操作
    /// </summary>
    public class MemoryCacheService : ICacheService
    {
        /// <summary>
        /// </summary>
        protected IMemoryCache _cache;

        /// <summary>
        /// </summary>
        /// <param name="cache"></param>
        public MemoryCacheService(IMemoryCache cache)
        {
            _cache = cache;
        }

        #region 验证缓存项是否存在

        /// <summary>
        ///     验证缓存项是否存在,TryGetValue 来检测 Key是否存在的
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Exists(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            return _cache.TryGetValue(key, out object cached);
        }

        #endregion 验证缓存项是否存在

        public Task<bool> AddAsync(string key, object value)
        {
            throw new NotImplementedException();
        }

        public Task<bool> AddAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            throw new NotImplementedException();
        }

        public Task<bool> RemoveAsync(string key)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// </summary>
        public void Dispose()
        {
            if (_cache != null)
            {
                _cache.Dispose();
            }

            GC.SuppressFinalize(this);
        }

        #region 添加缓存

        /// <summary>
        ///     添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <returns></returns>
        public bool Add(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            _cache.Set(key, value);
            return Exists(key);
        }

        /// <summary>
        ///     添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            _cache.Set(key, value,
                new MemoryCacheEntryOptions()
                    .SetSlidingExpiration(expiresSliding)
                    .SetAbsoluteExpiration(expiressAbsoulte)
            );

            return Exists(key);
        }

        /// <summary>
        ///     添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            if (isSliding)
            {
                _cache.Set(key, value,
                    new MemoryCacheEntryOptions()
                        .SetSlidingExpiration(expiresIn)
                );
            }
            else
            {
                _cache.Set(key, value,
                    new MemoryCacheEntryOptions()
                        .SetAbsoluteExpiration(expiresIn)
                );
            }

            return Exists(key);
        }

        public Task<bool> HashSetAsync(string key, string filed, object value)
        {
            throw new NotImplementedException();
        }

        #endregion 添加缓存

        #region 删除缓存

        /// <summary>
        ///     删除缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Remove(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            _cache.Remove(key);

            return !Exists(key);
        }

        /// <summary>
        ///     批量删除缓存
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        public void RemoveAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }

            keys.ToList().ForEach(item => _cache.Remove(item));
        }

        /// <summary>
        ///     删除所有缓存
        /// </summary>
        public void RemoveCacheAll()
        {
            List<string> l = GetCacheKeys();
            foreach (string s in l)
            {
                Remove(s);
            }
        }

        /// <summary>
        ///     删除匹配到的缓存
        /// </summary>
        /// <param name="pattern"></param>
        /// <returns></returns>
        public void RemoveByPattern(string pattern)
        {
            IList<string> l = SearchCacheRegex(pattern);
            foreach (string s in l)
            {
                Remove(s);
            }
        }

        /// <summary>
        ///     搜索 匹配到的缓存
        /// </summary>
        /// <param name="pattern"></param>
        /// <returns></returns>
        public IList<string> SearchCacheRegex(string pattern)
        {
            List<string> cacheKeys = GetCacheKeys();
            List<string> l = cacheKeys.Where(k => Regex.IsMatch(k, pattern)).ToList();
            return l.AsReadOnly();
        }

        #endregion 删除缓存

        #region 获取缓存

        /// <summary>
        ///     获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public T Get<T>(string key) where T : class
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            return _cache.Get(key) as T;
        }

        /// <summary>
        ///     获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public object Get(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            return _cache.Get(key);
        }

        /// <summary>
        ///     获取缓存集合
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        public IDictionary<string, object> GetAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }

            Dictionary<string, object> dict = new Dictionary<string, object>();

            keys.ToList().ForEach(item => dict.Add(item, _cache.Get(item)));

            return dict;
        }

        /// <summary>
        ///     获取所有缓存键
        /// </summary>
        /// <returns></returns>
        public List<string> GetCacheKeys()
        {
            const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
            object entries = _cache.GetType().GetField("_entries", flags).GetValue(_cache);
            IDictionary cacheItems = entries as IDictionary;
            List<string> keys = new List<string>();
            if (cacheItems == null)
            {
                return keys;
            }

            foreach (DictionaryEntry cacheItem in cacheItems)
            {
                keys.Add(cacheItem.Key.ToString());
            }

            return keys;
        }

        #endregion 获取缓存

        #region 修改缓存

        /// <summary>
        ///     修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <returns></returns>
        public bool Replace(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            if (Exists(key))
            {
                if (!Remove(key))
                {
                    return false;
                }
            }

            return Add(key, value);
        }

        /// <summary>
        ///     修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            if (Exists(key))
            {
                if (!Remove(key))
                {
                    return false;
                }
            }

            return Add(key, value, expiresSliding, expiressAbsoulte);
        }

        /// <summary>
        ///     修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            if (Exists(key))
            {
                if (!Remove(key))
                {
                    return false;
                }
            }

            return Add(key, value, expiresIn, isSliding);
        }

        #endregion 修改缓存

        #region Hash

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool HSet(string key, string filed, object value)
        {
            return RedisHelper.HSet(key, filed, value);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public Task<bool> HSetAsync(string key, string filed, object value)
        {
            return RedisHelper.HSetAsync(key, filed, value);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public Task<bool> HMSetAsync(string key, object[] value)
        {
            return RedisHelper.HMSetAsync(key, value);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool HMSet(string key, object[] value)
        {
            return RedisHelper.HMSet(key, value);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public string[] HMGet(string key, string[] filed)
        {
            return RedisHelper.HMGet(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public Task<string[]> HMGetAsync(string key, string filed)
        {
            return RedisHelper.HMGetAsync(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public long HDel(string key, string[] filed)
        {
            return RedisHelper.HDel(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public Task<long> HDelAsync(string key, string filed)
        {
            return RedisHelper.HDelAsync(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public bool HExists(string key, string filed)
        {
            return RedisHelper.HExists(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public Task<bool> HExistsAsync(string key, string filed)
        {
            return RedisHelper.HExistsAsync(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public Task<long> HIncrByAsync(string key, string filed)
        {
            return RedisHelper.HIncrByAsync(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public long HIncrBy(string key, string filed)
        {
            return RedisHelper.HIncrBy(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public Task<Dictionary<string, string>> HGetAllAsync(string key)
        {
            return RedisHelper.HGetAllAsync(key);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public Dictionary<string, string> HGetAll(string key)
        {
            return RedisHelper.HGetAll(key);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <returns></returns>
        public async Task<string> HGetAsync(string key, string filed)
        {
            return await RedisHelper.HGetAsync(key, filed);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public Task<bool> HSetNxAsync(string key, string filed, object value)
        {
            return RedisHelper.HSetNxAsync(key, filed, value);
        }

        /// <summary>
        /// </summary>
        /// <param name="key"></param>
        /// <param name="filed"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool HSetNx(string key, string filed, object value)
        {
            return RedisHelper.HSetNx(key, filed, value);
        }

        #endregion Hash
    }
}