using Newtonsoft.Json;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using VOL.Core.Configuration;
using VOL.Core.Const;

namespace VOL.Core.CacheManager
{
    public class RedisCacheService : ICacheService
    {
        protected StackExchange.Redis.IDatabase _cache;

        private ConnectionMultiplexer _connection;

        private readonly string _instance;


        public RedisCacheService()
        {
            _connection = ConnectionMultiplexer.Connect(AppSetting.RedisConnectionString);
            _cache = _connection.GetDatabase(3);
            _instance = "nc";
        }

        public string GetKeyForRedis(string key)
        {
            return _instance + key;
        }
        /// <summary>
        /// 验证缓存项是否存在
        /// </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.KeyExists(key);
        }

        public void ListLeftPush(string key, string val)
        {
            _cache.ListLeftPush(key, val);
        }

        public void ListRightPush(string key, string val)
        {
            _cache.ListRightPush(key, val);
        }


        public T ListDequeue<T>(string key) where T : class
        {
            RedisValue redisValue = _cache.ListRightPop(key);
            if (!redisValue.HasValue)
                return null;
            return JsonConvert.DeserializeObject<T>(redisValue);
        }
        public object ListDequeue(string key)
        {
            RedisValue redisValue = _cache.ListRightPop(key);
            if (!redisValue.HasValue)
                return null;
            return redisValue;
        }

        /// <summary>
        /// 移除list中的数据，keepIndex为保留的位置到最后一个元素如list 元素为1.2.3.....100
        /// 需要移除前3个数，keepindex应该为4
        /// </summary>
        /// <param name="key"></param>
        /// <param name="keepIndex"></param>
        public void ListRemove(string key, int keepIndex)
        {
            _cache.ListTrim(key, keepIndex, -1);
        }

        public bool AddObject(string key, object value, TimeSpan? expiresIn = null, bool isSliding = false)
        {
            return _cache.StringSet(key, JsonConvert.SerializeObject(value), expiresIn);
        }

        /// <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,Redis中无效）</param>
        /// <returns></returns>
        public bool Add(string key, string value, TimeSpan? expiresIn = null, bool isSliding = false)
        {
            return _cache.StringSet(key, value, expiresIn);
        }
        /// <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));
            }
            return _cache.KeyDelete(key);
        }
        /// <summary>
        /// 批量删除缓存
        /// </summary>
        /// <param name="key">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 => Remove(item));
        }
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public T Get<T>(string key) where T : class
        {
            var value = _cache.StringGet(key);

            if (!value.HasValue)
            {
                return null;
            }

            return JsonConvert.DeserializeObject<T>(value);
        }
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public string Get(string key)
        {
           return _cache.StringGet(key).ToString();
        }
        /// <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)
        {
            var dict = new Dictionary<string, object>();
            keys.ToList().ForEach(item => dict.Add(item, Get(item)));
            return dict;
        }

        ///  return JsonConvert.DeserializeObject(value);
        /// <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 (Exists(key))
                if (!Remove(key))
                    return false;

            return AddObject(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 (Exists(key))
                if (!Remove(key))
                    return false;
            if (value.GetType().Name == "String")
            {
                return Add(key, value.ToString(), expiresSliding);
            }
            return AddObject(key, value, expiresSliding);


        }
        /// <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 (Exists(key))
                if (!Remove(key)) return false;
            if (value.GetType().Name == "String")
            {
                return Add(key, value.ToString());
            }
            return AddObject(key, value);

        }
        public void Dispose()
        {
            if (_connection != null)
                _connection.Dispose();
            GC.SuppressFinalize(this);
        }


    }
}