using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using MP.AppAuth.Controllers;
using MP.AppAuth.Models;
using Newtonsoft.Json;
using NLog;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace MP.AppAuth.Services
{
    public class AppAuthService : IDisposable
    {
        #region Public Fields

        // diritti (cablato)
        public const string RoleSuperAdmin = "MoonPro_SuperAdmin";

        public static AppAuthController dbController;
        public static MPController MpDbController;
        public static AppUserController userController;

        #endregion Public Fields

        #region Private Fields

        // gestione key Redis
        private const string redisBaseAddr = "MP:LAND";

        private const string rKeyDirittiUser = $"{redisBaseAddr}:DIR_USER";

        private const string rKeyMacchine = $"{redisBaseAddr}:MACCHINE";

        private const string rKeyPermUser = $"{redisBaseAddr}:PERM_USER";

        private static IConfiguration _configuration;

        private static ILogger<AppAuthService> _logger;

        private static JsonSerializerSettings? JSSettings;

        private static Logger Log = LogManager.GetCurrentClassLogger();

        private static string Modulo = "";

        /// <summary>
        /// Durata cache lunga IN SECONDI
        /// </summary>
        private int cacheTtlLong = 60 * 5;

        /// <summary>
        /// Durata cache breve IN SECONDI
        /// </summary>
        private int cacheTtlShort = 60 * 1;

        /// <summary>
        /// Oggetto per connessione a REDIS
        /// </summary>
        private IConnectionMultiplexer redisConn;

        //ISubscriber sub = redis.GetSubscriber();
        /// <summary>
        /// Oggetto DB redis da impiegare x chiamate R/W
        /// </summary>
        private StackExchange.Redis.IDatabase redisDb = null!;

        private Random rnd = new Random();

        private Dictionary<string, string> Vocabolario = new Dictionary<string, string>();

        #endregion Private Fields

        #region Public Constructors

        public AppAuthService(IConfiguration configuration, ILogger<AppAuthService> logger, IConnectionMultiplexer redisConnMult)
        {
            _logger = logger;
            _configuration = configuration;

            // cod app
            CodApp = _configuration.GetValue<string>("SpecialConf:CodApp");
            Modulo = _configuration.GetValue<string>("ServerConf:Modulo");

            // Conf cache
            redisConn = redisConnMult;
            redisDb = this.redisConn.GetDatabase();

            // json serializer... FIX errore loop circolare https://www.ryadel.com/en/jsonserializationexception-self-referencing-loop-detected-error-fix-entity-framework-asp-net-core/
            JSSettings = new JsonSerializerSettings()
            {
                ReferenceLoopHandling = ReferenceLoopHandling.Ignore
            };

            // conf DB
            string connStr = _configuration.GetConnectionString("MP.Land.Auth");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new AppAuthController(configuration);
                MpDbController = new MPController(configuration);
                userController = new AppUserController(configuration);
                _logger.LogInformation("DbController OK");
            }
        }

        #endregion Public Constructors

        #region Private Properties

        private string CodApp { get; set; } = "";

        /// <summary>
        /// Durata cache lunga (+ perturbazione percentuale +/-10%)
        /// </summary>
        private TimeSpan FastCache
        {
            get => TimeSpan.FromSeconds(cacheTtlShort * rnd.Next(900, 1100) / 1000);
        }

        /// <summary>
        /// Durata cache lunga (+ perturbazione percentuale +/-10%)
        /// </summary>
        private TimeSpan LongCache
        {
            get => TimeSpan.FromSeconds(cacheTtlLong * rnd.Next(900, 1100) / 1000);
        }

        /// <summary>
        /// Durata cache lunga (+ perturbazione percentuale +/-10%)
        /// </summary>
        private TimeSpan UltraLongCache
        {
            get => TimeSpan.FromSeconds(cacheTtlLong * 10 * rnd.Next(900, 1100) / 1000);
        }

        #endregion Private Properties

        #region Public Methods

        /// <summary>
        /// Lista Causali Scarto
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaCausaliScarto>> AnagCauSca()
        {
            List<AnagraficaCausaliScarto> dbResult = new List<AnagraficaCausaliScarto>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagCauSca();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagCauSca: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Lista AnagClassiTempo
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagClassiTempo>> AnagClassiTempo()
        {
            List<AnagClassiTempo> dbResult = new List<AnagClassiTempo>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagClassiTempo();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagClassiTempo: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Lista AnagEventi
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaEventi>> AnagEventi()
        {
            List<AnagraficaEventi> dbResult = new List<AnagraficaEventi>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagEventi();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagEventi: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Lista Gruppi
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaGruppi>> AnagGruppiAll()
        {
            List<AnagraficaGruppi> dbResult = new List<AnagraficaGruppi>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.AnagGruppiGetAll();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagGruppiAll: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<List<AnagraficaGruppi>> AnagGruppiFilt(string codTipo)
        {
            List<AnagraficaGruppi> dbResult = new List<AnagraficaGruppi>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.AnagGruppiFilt(codTipo);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagGruppiFilt: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Lista AnagEventi
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaIngressi>> AnagIngressi()
        {
            List<AnagraficaIngressi> dbResult = new List<AnagraficaIngressi>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagIngressi();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagIngressi: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> AnagKeyValAdd(AnagKeyValueModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.AnagKeyValuesUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"AnagKeyValAdd | Aggiunto rec | NomeVar: {currRec.NomeVar} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<bool> AnagKeyValDelete(string NomeVar)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.AnagKeyValuesDelete(NomeVar);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"AnagKeyValDelete | Effettuata cancellazione | NomeVar: {NomeVar} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<List<AnagKeyValueModel>> AnagKeyValList()
        {
            List<AnagKeyValueModel> dbResult = new List<AnagKeyValueModel>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagKeyValuesGetAll();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagKeyValList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> AnagKeyValUpd(AnagKeyValueModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.AnagKeyValuesUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"AnagKeyValUpd | Effettuata modifica | NomeVar: {currRec.NomeVar} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        /// <summary>
        /// Lista AnagEventi
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaMicroStati>> AnagMicroStati()
        {
            List<AnagraficaMicroStati> dbResult = new List<AnagraficaMicroStati>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagMicroStati();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagMicroStati: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<List<AnagraficaOperatori>> AnagOperByGroupList(string codGruppo, string searchVal)
        {
            List<AnagraficaOperatori> dbResult = new List<AnagraficaOperatori>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            var rawData = dbController
                        .AnagOpByGruppoGetFilt(codGruppo, searchVal);
            dbResult = rawData
                        .GroupBy(user => user.MatrOpr)
                        .Select(grp => grp.First())
                        .ToList();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagOperByGroupList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<List<AnagraficaOperatori>> AnagOperList(string searchVal)
        {
            List<AnagraficaOperatori> dbResult = new List<AnagraficaOperatori>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.AnagOpGetAll(searchVal);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagOperList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Lista AnagStati
        /// </summary>
        /// <returns></returns>
        public async Task<List<AnagraficaStati>> AnagStati()
        {
            List<AnagraficaStati> dbResult = new List<AnagraficaStati>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.AnagStati();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per AnagStati: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> ConfigAdd(ConfigModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.ConfigUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"ConfigAdd | Aggiunto rec | Chiave: {currRec.Chiave} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<bool> ConfigDelete(string Chiave)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.ConfigDelete(Chiave);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"ConfigDelete | Effettuata cancellazione | Chiave: {Chiave} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<List<ConfigModel>> ConfigList()
        {
            List<ConfigModel> dbResult = new List<ConfigModel>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.ConfigGetAll();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per ConfigList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> ConfigUpd(ConfigModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.ConfigUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"ConfigUpd | Effettuata modifica | Chiave: {currRec.Chiave} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        /// <summary>
        /// Elenco diritti dato utente
        /// </summary>
        /// <param name="UserName"></param>
        /// <returns></returns>
        public async Task<List<UserDirittiModel>> DirittiGetByUser(string UserName)
        {
            string source = "DB";
            List<UserDirittiModel>? dbResult = new List<UserDirittiModel>();
            string currKey = $"{rKeyDirittiUser}:{UserName}";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            string? rawData = await redisDb.StringGetAsync(currKey);
            if (!string.IsNullOrEmpty(rawData) && rawData.Length > 2)
            {
                source = "REDIS";
                var tempResult = JsonConvert.DeserializeObject<List<UserDirittiModel>>(rawData);
                dbResult = tempResult ?? new List<UserDirittiModel>();
            }
            else
            {
                // recupero diritti utente
                dbResult = userController.DirittiUtente(UserName, Modulo);
                rawData = JsonConvert.SerializeObject(dbResult, JSSettings);
                await redisDb.StringSetAsync(currKey, rawData, UltraLongCache);
            }
            if (dbResult == null)
            {
                dbResult = new List<UserDirittiModel>();
            }
            sw.Stop();
            Log.Debug($"DirittiGetByUser | {source} | {sw.ElapsedMilliseconds} ms");
            return dbResult;
        }

        public void Dispose()
        {
            // Clear database controller
            if (MpDbController != null)
            {
                MpDbController.Dispose();
            }
        }

        public async Task FlushRedisCache()
        {
            RedisValue pattern = new RedisValue($"{redisBaseAddr}:*");
            bool answ = await ExecFlushRedisPattern(pattern);
            // reset in RAM
            Vocabolario = new Dictionary<string, string>();
            CheckVoc();
        }

        /// <summary>
        /// Elenco ListValues
        /// </summary>
        /// <returns></returns>
        public async Task<List<ListValues>> ListValues()
        {
            List<ListValues> dbResult = new List<ListValues>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.ListValues();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per ListValues: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// Elenco Macchine gestite
        /// </summary>
        /// <param name="UserName"></param>
        /// <returns></returns>
        public List<MacchineModel> MacchineGetAll()
        {
            string source = "DB";
            List<MacchineModel>? dbResult = new List<MacchineModel>();
            string currKey = $"{rKeyMacchine}";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            string? rawData = redisDb.StringGet(currKey);
            if (!string.IsNullOrEmpty(rawData) && rawData.Length > 2)
            {
                source = "REDIS";
                var tempResult = JsonConvert.DeserializeObject<List<MacchineModel>>(rawData);
                dbResult = tempResult ?? new List<MacchineModel>();
            }
            else
            {
                // recupero diritti utente
                dbResult = MpDbController.MacchineGetAll();
                rawData = JsonConvert.SerializeObject(dbResult, JSSettings);
                redisDb.StringSet(currKey, rawData, UltraLongCache);
            }
            if (dbResult == null)
            {
                dbResult = new List<MacchineModel>();
            }
            sw.Stop();
            Log.Debug($"MacchineGetAll | {source} | {sw.ElapsedMilliseconds} ms");
            return dbResult;
        }

        /// <summary>
        /// Elenco permessi dato utente
        /// </summary>
        /// <param name="UserName"></param>
        /// <returns></returns>
        public async Task<List<PermessiModel>> PermessiGetByUser(string UserName)
        {
            string source = "DB";
            List<PermessiModel>? dbResult = new List<PermessiModel>();
            string currKey = $"{rKeyPermUser}:{UserName}";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            string? rawData = await redisDb.StringGetAsync(currKey);
            if (!string.IsNullOrEmpty(rawData))
            {
                source = "REDIS";
                var tempResult = JsonConvert.DeserializeObject<List<PermessiModel>>(rawData);
                if (tempResult == null)
                {
                    dbResult = new List<PermessiModel>();
                }
                else
                {
                    dbResult = tempResult;
                }
            }
            else
            {
                // recupero diritti utente
                var userRightList = userController.DirittiUtente(UserName, Modulo);
                // proietto come funzioni...
                var ListFunc = userRightList.Select(x => x.Funzione).ToList();
                // trasformo i permessi utente
                if (ListFunc == null)
                {
                    ListFunc = new List<string>();
                }
                dbResult = dbController.PermessiGetByFunc(ListFunc);
                rawData = JsonConvert.SerializeObject(dbResult, JSSettings);
                await redisDb.StringSetAsync(currKey, rawData, UltraLongCache);
            }
            if (dbResult == null)
            {
                dbResult = new List<PermessiModel>();
            }
            sw.Stop();
            Log.Debug($"PermessiGetByUser | {source} | {sw.ElapsedMilliseconds} ms");
            return dbResult;
        }

        public string Traduci(string lemma, string lingua = "IT")
        {
            string answ = $"__{lemma}__";
            string keyReq = $"{lingua}#{lemma}";
            CheckVoc();
            // cerco in vocabolario...
            if (Vocabolario.ContainsKey(keyReq))
            {
                answ = Vocabolario[keyReq];
            }
            return answ;
        }

        public async Task<List<UpdMan>> UpdManList()
        {
            List<UpdMan> dbResult = new List<UpdMan>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.UpdManGetAll();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per UpdManList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> VocabolarioAdd(VocabolarioModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.VocabolarioUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"VocabolarioAdd | Aggiunto rec | lingua: {currRec.Lingua} | lemma: {currRec.Lemma} | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<bool> VocabolarioDelete(VocabolarioModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.VocabolarioDelete(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"VocabolarioDelete | Effettuata cancellazione | lingua: {currRec.Lingua} | lemma: {currRec.Lemma}  | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        public async Task<List<VocabolarioModel>> VocabolarioList()
        {
            List<VocabolarioModel> dbResult = new List<VocabolarioModel>();
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = MpDbController.VocabolarioGetAll();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"Effettuata lettura da DB per VocabolarioList: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> VocabolarioUpd(VocabolarioModel currRec)
        {
            bool answ = false;
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            answ = MpDbController.VocabolarioUpsert(currRec);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Trace($"VocabolarioUpd | Effettuata modifica | lingua: {currRec.Lingua} | lemma: {currRec.Lemma}  | durata: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(answ);
        }

        #endregion Public Methods

        #region Protected Methods

        protected void CheckVoc()
        {
            if (Vocabolario.Count == 0)
            {
                string source = "DB";
                string currKey = $"{redisBaseAddr}:MP:VOCAB";
                Stopwatch sw = new Stopwatch();
                sw.Start();
                string? rawData = redisDb.StringGet(currKey);
                if (!string.IsNullOrEmpty(rawData) && rawData.Length > 2)
                {
                    source = "REDIS";
                    var tempResult = JsonConvert.DeserializeObject<Dictionary<string, string>>(rawData);
                    Vocabolario = tempResult ?? new Dictionary<string, string>();
                }
                else
                {
                    Vocabolario = dbController
                                    .VocabolarioGetAll()
                                    .ToDictionary(x => $"{x.Lingua}#{x.Lemma}", x => x.Traduzione);
                    rawData = JsonConvert.SerializeObject(Vocabolario);
                    redisDb.StringSet(currKey, rawData, UltraLongCache);
                }
                sw.Stop();
                Log.Trace($"Rilettura Vocabolario | {source} | {sw.ElapsedMilliseconds} ms");
            }
        }

        #endregion Protected Methods

        #region Private Methods

        /// <summary>
        /// Esegue flush memoria redis dato pat2Flush
        /// </summary>
        /// <param name="pat2Flush"></param>
        /// <returns></returns>
        private async Task<bool> ExecFlushRedisPattern(RedisValue pat2Flush)
        {
            bool answ = false;
            var masterEndpoint = redisConn.GetEndPoints()
                                           .Where(ep => redisConn.GetServer(ep).IsConnected && !redisConn.GetServer(ep).IsReplica)
                                           .FirstOrDefault();

            // sepattern è "*" elimino intero DB...
            if (masterEndpoint != null && (pat2Flush.Equals(new RedisValue("*")) || pat2Flush == RedisValue.Null))
            {
                redisConn.GetServer(masterEndpoint).FlushDatabase(database: redisDb.Database);
            }
            else
            {
                var server = redisConn.GetServer(masterEndpoint);
                var keys = server.Keys(database: redisDb.Database, pattern: pat2Flush, pageSize: 1000);

                var deleteTasks = new List<Task>();
                foreach (var key in keys)
                {
                    deleteTasks.Add(redisDb.KeyDeleteAsync(key));
                    if (deleteTasks.Count >= 1000)
                    {
                        await Task.WhenAll(deleteTasks);
                        deleteTasks.Clear();
                    }
                }
                if (deleteTasks.Count > 0)
                {
                    await Task.WhenAll(deleteTasks);
                }
            }
            answ = true;
            return answ;
        }

        #endregion Private Methods
    }
}