using System;
using System.Configuration;
using Newtonsoft.Json;
using StackExchange.Redis;

namespace BLL
{
    /// <summary>
    /// 
    /// </summary>
    public class Redis : ICache
    {
        int Default_Timeout = 600;//默认超时时间（单位秒）
        string address;
        JsonSerializerSettings jsonConfig = new JsonSerializerSettings() { ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore, NullValueHandling = NullValueHandling.Ignore };
        ConnectionMultiplexer connectionMultiplexer;
        IDatabase database;

        class CacheObject<T>
        {
            public int ExpireTime { get; set; }
            public bool ForceOutofDate { get; set; }
            public T Value { get; set; }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="dbbase"></param>
        public Redis(int dbbase = 0)
        {
            this.address = this.address = ConfigurationManager.AppSettings["RedisHosts"];

            if (this.address == null || string.IsNullOrWhiteSpace(this.address.ToString()))
                throw new ApplicationException("配置文件中未找到RedisServer的有效配置");
            connectionMultiplexer = ConnectionMultiplexer.Connect(address);
            database = connectionMultiplexer.GetDatabase(dbbase);
        }

        /// <summary>
        /// 连接超时设置
        /// </summary>
        public int TimeOut
        {
            get
            {
                return Default_Timeout;
            }
            set
            {
                Default_Timeout = value;
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public object Get(string key)
        {
            return Get<object>(key);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public T Get<T>(string key)
        {

            DateTime begin = DateTime.Now;
            var cacheValue = database.StringGet(key);
            DateTime endCache = DateTime.Now;
            var value = default(T);
            if (!cacheValue.IsNull)
            {
                var cacheObject = JsonConvert.DeserializeObject<CacheObject<T>>(cacheValue, jsonConfig);
                if (!cacheObject.ForceOutofDate)
                    database.KeyExpire(key, new TimeSpan(0, 0, cacheObject.ExpireTime));
                value = cacheObject.Value;
            }
            DateTime endJson = DateTime.Now;
            return value;

        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="data"></param>
        public void Insert(string key, object data)
        {
            var jsonData = GetJsonData(data, TimeOut, false);
            database.StringSet(key, jsonData);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        public void Insert(string key, object data, int cacheTime)
        {
            var timeSpan = TimeSpan.FromSeconds(cacheTime);
            var jsonData = GetJsonData(data, TimeOut, true);
            database.StringSet(key, jsonData, timeSpan);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        public void Insert(string key, object data, DateTime cacheTime)
        {
            var timeSpan = cacheTime - DateTime.Now;
            var jsonData = GetJsonData(data, TimeOut, true);
            database.StringSet(key, jsonData, timeSpan);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="data"></param>
        public void Insert<T>(string key, T data)
        {
            var jsonData = GetJsonData<T>(data, TimeOut, false);
            database.StringSet(key, jsonData);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        public void Insert<T>(string key, T data, int cacheTime)
        {
            var timeSpan = TimeSpan.FromSeconds(cacheTime);
            var jsonData = GetJsonData<T>(data, TimeOut, true);
            database.StringSet(key, jsonData, timeSpan);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        public void Insert<T>(string key, T data, DateTime cacheTime)
        {
            var timeSpan = cacheTime - DateTime.Now;
            var jsonData = GetJsonData<T>(data, TimeOut, true);
            database.StringSet(key, jsonData, timeSpan);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        /// <param name="forceOutOfDate"></param>
        /// <returns></returns>
        string GetJsonData(object data, int cacheTime, bool forceOutOfDate)
        {
            var cacheObject = new CacheObject<object>() { Value = data, ExpireTime = cacheTime, ForceOutofDate = forceOutOfDate };
            return JsonConvert.SerializeObject(cacheObject, jsonConfig);//序列化对象
        }
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="data"></param>
        /// <param name="cacheTime"></param>
        /// <param name="forceOutOfDate"></param>
        /// <returns></returns>
        string GetJsonData<T>(T data, int cacheTime, bool forceOutOfDate)
        {
            var cacheObject = new CacheObject<T>() { Value = data, ExpireTime = cacheTime, ForceOutofDate = forceOutOfDate };
            return JsonConvert.SerializeObject(cacheObject, jsonConfig);//序列化对象
        }
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        public void Remove(string key)
        {
            database.KeyDelete(key, CommandFlags.HighPriority);
        }

        /// <summary>
        /// 判断key是否存在
        /// </summary>
        public bool Exists(string key)
        {
            return database.KeyExists(key);
        }

        /// <summary>
        /// 右侧入队
        /// </summary>
        /// <param name="queueName">队列名称</param>
        /// <param name="redisValue">值</param>
        /// <returns></returns>
        public long EnqueueListRightPush(RedisKey queueName, RedisValue redisValue)
        {
            return database.ListRightPush(queueName, redisValue);
        }

        /// <summary>
        /// 左侧入队
        /// </summary>
        /// <param name="queueName">队列名称</param>
        /// <param name="redisvalue">队列值</param>
        /// <returns></returns>
        public long EnqueueListLeftPush(RedisKey queueName, RedisValue redisvalue)
        {
            return database.ListLeftPush(queueName, redisvalue);
        }

        /// <summary>
        /// 获取队列长度
        /// </summary>
        /// <param name="queueName">队列名称</param>
        /// <returns></returns>
        public long EnqueueListLength(RedisKey queueName)
        {
            if (database.KeyExists(queueName))
            {
                return database.ListLength(queueName);
            }
            else
            {
                return 0;
            }

        }

        /// <summary>
        /// 左侧出队
        /// </summary>
        /// <param name="queueName"></param>
        /// <returns></returns>
        public string DequeueListPopLeft(RedisKey queueName)
        {
            int count = database.ListRange(queueName).Length;
            if (count > 0)
            {
                string redisValue = database.ListLeftPop(queueName);
                if (!string.IsNullOrEmpty(redisValue))
                    return redisValue;
                else
                    return string.Empty;
            }
            else
            {
                return "-1";
                throw new Exception($"队列{queueName}数据为零");
            }
        }

        /// <summary>
        /// 右侧出队
        /// </summary>
        public string DequeueListPopRight(RedisKey queueName)
        {
            int count = database.ListRange(queueName).Length;
            if (count > 0)
            {
                string redisValue = database.ListRightPop(queueName);
                if (!string.IsNullOrEmpty(redisValue))
                    return redisValue;
                else
                    return string.Empty;
            }
            else
            {
                return "-1";
                throw new Exception($"队列{queueName}数据为零");
            }
        }

        /// <summary>
        /// 分布式加锁
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="data">值</param>
        /// <param name="seconds">过期时间</param>
        /// <returns></returns>
        public bool LockTake(string key, string data, TimeSpan seconds, int db = 0)
        {
            return database.LockTake(key, data, seconds);
        }

        /// <summary>
        /// 解锁
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="data">值</param>
        /// <returns></returns>
        public bool LockRelease(string key, string data, int db = -1)
        {
            return database.LockRelease(key, data);
        }
    }
}