using Microsoft.Extensions.Configuration;
using MP.Data.Conf;
using MP.Data.DbModels;
using Newtonsoft.Json;
using NLog;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MP.Data.Services
{
    /// <summary>
    /// Classe accesso processi traduzione
    /// </summary>
    public class TranslateSrv : BaseServ, IDisposable
    {
        #region Public Constructors

        public TranslateSrv(IConfiguration configuration)
        {
            Stopwatch sw = Stopwatch.StartNew();
            sw.Start();
            _configuration = configuration;
            // setup compoenti REDIS
            redisConn = ConnectionMultiplexer.Connect(_configuration.GetConnectionString("Redis"));
            redisDb = redisConn.GetDatabase();

            // conf DB
            string connStr = _configuration.GetConnectionString("MP.Voc");
            if (string.IsNullOrEmpty(connStr))
            {
                Log.Error("MP.Voc: ConnString empty!");
            }
            else
            {
                dbController = new Controllers.MpVocController(configuration);
                InitDict();
                sw.Stop();
                Log.Info($"TranslateSrv | MpVocController OK | {sw.Elapsed.TotalMilliseconds} ms");
            }
        }

        #endregion Public Constructors

        #region Public Properties

        public static Controllers.MpVocController dbController { get; set; } = null!;

        #endregion Public Properties

        #region Public Methods

        /// <summary>
        /// Recupero elenco config
        /// </summary>
        /// <returns></returns>
        public async Task<List<ConfigModel>> ConfigGetAll()
        {
            string source = "DB";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            List<ConfigModel>? result = new List<ConfigModel>();
            // cerco in redis...
            string currKey = $"{redisBaseKey}:Conf";
            RedisValue rawData = await redisDb.StringGetAsync(currKey);
            //if (!string.IsNullOrEmpty($"{rawData}"))
            if (rawData.HasValue)
            {
                result = JsonConvert.DeserializeObject<List<ConfigModel>>($"{rawData}");
                source = "REDIS";
            }
            else
            {
                result = dbController.ConfigGetAll();
                // serializzo e salvo...
                rawData = JsonConvert.SerializeObject(result);
                redisDb.StringSet(currKey, rawData, LongCache);
            }
            if (result == null)
            {
                result = new List<ConfigModel>();
            }
            sw.Stop();
            Log.Debug($"ConfigGetAll | {source} | {sw.Elapsed.TotalMilliseconds}ms");
            return result;
        }

        public void Dispose()
        {
            // Clear database controller
            dbController.Dispose();
            // redis dispose
            redisConn = null;
            redisDb = null;
        }

        /// <summary>
        /// Pulizia cache Redis (tutta)
        /// </summary>
        /// <returns></returns>
        public async Task<bool> FlushCache()
        {
            RedisValue pattern = new RedisValue($"{redisBaseKey}:*");
            bool answ = await ExecFlushRedisPattern(pattern);
            // rileggo vocabolario!
            var rawData = await VocabolarioGetAll();
            DictVocab = rawData.ToDictionary(kvp => $"{kvp.Lingua}_{kvp.Lemma}".ToUpper(), kvp => kvp.Traduzione);
            return answ;
        }

        /// <summary>
        /// Pulizia cache Redis per chiave specifica (da redisBaseKey...)
        /// </summary>
        /// <returns></returns>
        public async Task<bool> FlushCache(string KeyReq)
        {
            RedisValue pattern = new RedisValue($"{redisBaseKey}:{KeyReq}:*");
            bool answ = await ExecFlushRedisPattern(pattern);
            return answ;
        }

        /// <summary>
        /// Recupero elenco config
        /// </summary>
        /// <returns></returns>
        public async Task<List<LingueModel>> LingueGetAll()
        {
            string source = "DB";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            List<LingueModel>? result = new List<LingueModel>();
            // cerco in redis...
            string currKey = $"{redisBaseKey}:Lang";
            RedisValue rawData = await redisDb.StringGetAsync(currKey);
            //if (!string.IsNullOrEmpty($"{rawData}"))
            if (rawData.HasValue)
            {
                result = JsonConvert.DeserializeObject<List<LingueModel>>($"{rawData}");
                source = "REDIS";
            }
            else
            {
                result = dbController.LingueGetAll();
                // serializzo e salvo...
                rawData = JsonConvert.SerializeObject(result);
                redisDb.StringSet(currKey, rawData, UltraLongCache);
            }
            if (result == null)
            {
                result = new List<LingueModel>();
            }
            sw.Stop();
            Log.Debug($"LingueGetAll | {source} | {sw.Elapsed.TotalMilliseconds}ms");
            return result;
        }

        /// <summary>
        /// Traduzione termine
        /// </summary>
        /// <param name="lemma"></param>
        /// <param name="lingua"></param>
        /// <returns></returns>
        public string Traduci(string lemma, string lingua = "IT")
        {
            string answ = $"[{lemma}.{lingua}]";
            string key = $"{lingua}_{lemma}".ToUpper();
            if (DictVocab.ContainsKey(key))
            {
                answ = DictVocab[key];
            }
            return answ;
        }

        /// <summary>
        /// Recupero elenco config
        /// </summary>
        /// <returns></returns>
        public async Task<List<VocabolarioModel>> VocabolarioGetAll()
        {
            string source = "DB";
            Stopwatch sw = new Stopwatch();
            sw.Start();
            List<VocabolarioModel>? result = new List<VocabolarioModel>();
            // cerco in redis...
            string currKey = $"{redisBaseKey}:Voc";
            RedisValue rawData = await redisDb.StringGetAsync(currKey);
            //if (!string.IsNullOrEmpty($"{rawData}"))
            if (rawData.HasValue)
            {
                result = JsonConvert.DeserializeObject<List<VocabolarioModel>>($"{rawData}");
                source = "REDIS";
            }
            else
            {
                result = dbController.VocabolarioGetAll();
                // serializzo e salvo...
                rawData = JsonConvert.SerializeObject(result);
                redisDb.StringSet(currKey, rawData, LongCache);
            }
            if (result == null)
            {
                result = new List<VocabolarioModel>();
            }
            sw.Stop();
            Log.Debug($"VocabolarioGetAll | {source} | {sw.Elapsed.TotalMilliseconds}ms");
            return result;
        }

        #endregion Public Methods

        #region Protected Fields

        /// <summary>
        /// Vocabolario x recupero rapido traduzioni
        /// </summary>
        protected static Dictionary<string, string> DictVocab = new Dictionary<string, string>();

        /// <summary>
        /// Oggetto per connessione a REDIS
        /// </summary>
        protected ConnectionMultiplexer redisConn = null!;

        /// <summary>
        /// Oggetto DB redis da impiegare x chiamate R/W
        /// </summary>
        protected IDatabase redisDb = null!;

        #endregion Protected Fields

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();

        private string redisBaseKey = "MP:Voc:Cache";

        #endregion Private Fields

        #region Private Methods

        /// <summary>
        /// Inizializzazione dict vari
        /// </summary>
        private static void InitDict()
        {
            // inizializzo dizionario vocabolario
            var rawData = dbController.VocabolarioGetAll();
            DictVocab = rawData.ToDictionary(kvp => $"{kvp.Lingua}_{kvp.Lemma}".ToUpper(), kvp => kvp.Traduzione);
        }

        /// <summary>
        /// Esegue flush memoria redis dato pattern
        /// </summary>
        /// <param name="pattern"></param>
        /// <returns></returns>
        private async Task<bool> ExecFlushRedisPattern(RedisValue pattern)
        {
            bool answ = false;
            var listEndpoints = redisConn.GetEndPoints();
            foreach (var endPoint in listEndpoints)
            {
                //var server = redisConnAdmin.GetServer(listEndpoints[0]);
                var server = redisConn.GetServer(endPoint);
                if (server != null)
                {
                    var keyList = server.Keys(redisDb.Database, pattern);
                    foreach (var item in keyList)
                    {
                        await redisDb.KeyDeleteAsync(item);
                    }
                    answ = true;
                }
            }

            return answ;
        }

        #endregion Private Methods
    }
}