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

namespace LiMan.UI.Data
{
    public class LiManDataService : IDisposable
    {
        #region Private Fields

        private static IConfiguration _configuration;
        private static ILogger<LiManDataService> _logger;

        private static NLog.Logger Log = LogManager.GetCurrentClassLogger();
        private readonly IDistributedCache distributedCache;
        private readonly IMemoryCache memoryCache;

        /// <summary>
        /// Durata assoluta massima della cache IN SECONDI
        /// </summary>
        private int chAbsExp = 60 * 5;

        /// <summary>
        /// Durata della cache IN SECONDI in modalità inattiva (non acceduta) prima di venire rimossa
        /// NON estende oltre il tempo massimo di validità della cache (chAbsExp)
        /// </summary>
        private int chSliExp = 60 * 1;

        #endregion Private Fields

        #region Protected Fields

        protected static string connStringBBM = "";

        #endregion Protected Fields

        #region Public Fields

        public static LiMan.DL.Controllers.LicManController dbController;

        #endregion Public Fields

        #region Public Constructors

        public LiManDataService(IConfiguration configuration, ILogger<LiManDataService> logger, IMemoryCache memoryCache, IDistributedCache distributedCache)
        {
            _logger = logger;
            _configuration = configuration;
            // conf cache
            this.memoryCache = memoryCache;
            this.distributedCache = distributedCache;
            // conf DB
            string connStr = _configuration.GetConnectionString("LiMan.DB");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new LiMan.DL.Controllers.LicManController(configuration);
                _logger.LogInformation("DbController OK");
            }
        }

        #endregion Public Constructors

        #region Private Methods

        private DistributedCacheEntryOptions cacheOpt(bool fastCache)
        {
            var numSecAbsExp = fastCache ? chAbsExp : chAbsExp * 10;
            var numSecSliExp = fastCache ? chSliExp : chSliExp * 10;
            return new DistributedCacheEntryOptions().SetAbsoluteExpiration(DateTime.Now.AddSeconds(numSecAbsExp)).SetSlidingExpiration(TimeSpan.FromSeconds(numSecSliExp));
        }

        #endregion Private Methods

        #region Protected Methods

        protected string getCacheKey(string TableName, SelectData CurrFilter)
        {
            string answ = $"{TableName}:D_{CurrFilter.DateStart:yyyyMMddHHmm}_{CurrFilter.DateEnd:yyyyMMddHHmm}";
            return answ;
        }

        #endregion Protected Methods

        #region Public Methods

        /// <summary>
        /// Hash Redis contenente i dati MP di una specifico TYPE (es StatusMacchina, StateMachineIngressi, ...)
        /// </summary>
        /// <param name="dataType"></param>
        /// <returns></returns>
        public static string mHash(string dataType)
        {
            return $"DATA:{dataType}";
        }

        public async Task<List<DL.DatabaseModels.AnagApplicazioni>> ApplicazioniGetAll()
        {
            List<DL.DatabaseModels.AnagApplicazioni> dbResult = new List<DL.DatabaseModels.AnagApplicazioni>();
            string cacheKey = mHash("Applicazioni");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<DL.DatabaseModels.AnagApplicazioni>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetApplicazioni();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(false));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per ApplicazioniGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> DbForceMigrate()
        {
            return await Task.FromResult(dbController.DbForceMigrate());
        }

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

        public async Task<List<DL.DatabaseModels.AnagInstallazioni>> InstallazioniGetAll()
        {
            List<DL.DatabaseModels.AnagInstallazioni> dbResult = new List<DL.DatabaseModels.AnagInstallazioni>();
            string cacheKey = mHash("Installazioni");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<DL.DatabaseModels.AnagInstallazioni>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetInstallazioni();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(false));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per InstallazioniGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        /// <summary>
        /// invalida tutta la cache in caso di update
        /// </summary>
        /// <returns></returns>
        public async Task InvalidateAllCache()
        {
            await distributedCache.RemoveAsync(mHash("Applicazioni"));
            await distributedCache.RemoveAsync(mHash("Installazioni"));
            await distributedCache.RemoveAsync(mHash("Licenze"));
            //await distributedCache.RemoveAsync(mHash("SUPPL:List"));
            //await distributedCache.RemoveAsync(mHash("TRANSP:List"));
            //await distributedCache.RemoveAsync(mHash("WEEKPLAN:List"));
        }

        public async Task<List<DL.DatabaseModels.LicenzeAttive>> LicenzeGetAll()
        {
            List<DL.DatabaseModels.LicenzeAttive> dbResult = new List<DL.DatabaseModels.LicenzeAttive>();
            string cacheKey = mHash("Licenze");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<DL.DatabaseModels.LicenzeAttive>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetLicenze();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(false));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per LicenzeGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        #endregion Public Methods
    }
}