using Microsoft.Extensions.Caching.Redis;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.Json;
using YC.Core.Cache;

namespace YC.Cache.Redis
{
    /// <summary>
    /// StackExchange.Redis是有超时的bug 
    /// </summary>
    public class RedisCacheManager : ICacheManager
    {

        protected IDatabase _cache;

        private ConnectionMultiplexer _connection;

        private readonly string _instance;


        public RedisCacheManager(RedisCacheOptions options, int database = 0)
        {
            _connection = ConnectionMultiplexer.Connect(options.Configuration);
            _cache = _connection.GetDatabase(database);
            _instance = options.InstanceName;
        }

        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(GetKeyForRedis(key));
        }

        /// <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));
            }
            return _cache.StringSet(GetKeyForRedis(key), JsonSerializer.SerializeToUtf8Bytes(value));
        }
        /// <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,Redis中无效）</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));
            }
            return _cache.StringSet(GetKeyForRedis(key), JsonSerializer.SerializeToUtf8Bytes(value), expiressAbsoulte);
        }
        /// <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, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            return _cache.StringSet(GetKeyForRedis(key), JsonSerializer.SerializeToUtf8Bytes(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(GetKeyForRedis(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
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            var value = _cache.StringGet(GetKeyForRedis(key));

            if (!value.HasValue)
            {
                return default(T);
            }

            return JsonSerializer.Deserialize<T>(value);
        }
        /// <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));
            }

            var value = _cache.StringGet(GetKeyForRedis(key));

            if (!value.HasValue)
            {
                return null;
            }
            return JsonSerializer.Deserialize<object>(value);
        }
        /// <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));
            }
            var dict = new Dictionary<string, object>();

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

            return dict;
        }

        /// <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 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 (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 (Exists(key))
                if (!Remove(key)) return false;

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

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

    }
}
