using Microsoft.Extensions.Configuration;
using System;
using Microsoft.Extensions.Logging;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using NLog;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.Memory;
using System.Diagnostics;
using System.Text;
using Newtonsoft.Json;
using System.Diagnostics.Eventing.Reader;

namespace MP.Land.Data
{
    public class AppAuthService : IDisposable
    {
        #region Private Fields

        private static IConfiguration _configuration;

        private static ILogger<AppAuthService> _logger;

        private static List<MP.AppAuth.Models.Macchine> ElencoMacchine = new List<MP.AppAuth.Models.Macchine>();

        private static NLog.Logger Log = LogManager.GetCurrentClassLogger();

        private readonly IDistributedCache distributedCache;

        private readonly IMemoryCache memoryCache;

        /// <summary>
        /// Durata assoluta massima della cache
        /// </summary>
        private int chAbsExp = 15;

        /// <summary>
        /// Durata della cache in modalità inattiva (non acceduta) prima di venire rimossa
        /// NON estende oltre il tempo massimo di validità della cache (chAbsExp)
        /// </summary>
        private int chSliExp = 5;

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

        #endregion Private Fields

        #region Public Fields

        public static AppAuth.Controllers.AppAuthController dbController;
        public static AppAuth.Controllers.MPController MpDbController;

        #endregion Public Fields

        #region Public Constructors

        public AppAuthService(IConfiguration configuration, ILogger<AppAuthService> logger, IMemoryCache memoryCache, IDistributedCache distributedCache)
        {
            _logger = logger;
            _configuration = configuration;
            // conf cache
            this.memoryCache = memoryCache;
            this.distributedCache = distributedCache;
            // conf DB
            string connStr = _configuration.GetConnectionString("MP.Land");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new AppAuth.Controllers.AppAuthController(configuration);
                MpDbController = new AppAuth.Controllers.MPController(configuration);
                _logger.LogInformation("DbController OK");
            }
        }



        #endregion Public Constructors

        #region Private Properties

        private DistributedCacheEntryOptions cacheOpt
        {
            get
            {
                return new DistributedCacheEntryOptions().SetAbsoluteExpiration(DateTime.Now.AddMinutes(chAbsExp)).SetSlidingExpiration(TimeSpan.FromMinutes(chSliExp));
            }
        }

        private DistributedCacheEntryOptions cacheOptLong
        {
            get
            {
                return new DistributedCacheEntryOptions().SetAbsoluteExpiration(DateTime.Now.AddMinutes(chAbsExp * 10)).SetSlidingExpiration(TimeSpan.FromMinutes(chSliExp));
            }
        }

        #endregion Private Properties

        #region Protected Methods

        protected void CheckVoc()
        {
            string cacheKey = ":MP:VOCAB";
            string rawData;
            if (Vocabolario.Count == 0)
            {
                var redisDataList = distributedCache.Get(cacheKey);
                if (redisDataList != null)
                {
                    rawData = Encoding.UTF8.GetString(redisDataList);
                    Vocabolario = JsonConvert.DeserializeObject<Dictionary<string, string>>(rawData);
                }
                else
                {
                    Stopwatch stopWatch = new Stopwatch();
                    stopWatch.Start();
                    Vocabolario = dbController.VocabolarioGetAll().ToDictionary(x => $"{x.Lingua}#{x.Lemma}", x => x.Traduzione);
                    rawData = JsonConvert.SerializeObject(Vocabolario);
                    redisDataList = Encoding.UTF8.GetBytes(rawData);
                    distributedCache.Set(cacheKey, redisDataList, cacheOptLong);
                    stopWatch.Stop();
                    TimeSpan ts = stopWatch.Elapsed;
                    Log.Trace($"Effettuato rilettura da DB + caching per Vocabolario: {ts.TotalMilliseconds} ms");
                }
            }
        }

        #endregion Protected Methods

        #region Public Methods

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

        public async Task<List<AppAuth.Models.AnagraficaOperatori>> AnagOperList(string searchVal)
        {
            List<AppAuth.Models.AnagraficaOperatori> dbResult = new List<AppAuth.Models.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);
        }

        public void Dispose()
        {
            // Clear database controller
            dbController.Dispose();
            MpDbController.Dispose();
        }

        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<AppAuth.Models.UpdMan>> UpdManList()
        {
            List<AppAuth.Models.UpdMan> dbResult = new List<AppAuth.Models.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<List<AppAuth.Models.AnagKeyValueModel>> AnagKeyValList()
        {
            List<AppAuth.Models.AnagKeyValueModel> dbResult = new List<AppAuth.Models.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 ResetCache()
        {
            string cacheKey = ":MP:VOCAB";
            await distributedCache.RemoveAsync(cacheKey);
        }

        #endregion Public Methods
    }
}