using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.Memory;
using MP.MONO.Core.DTO;
using MP.MONO.Data.Controllers;
using Newtonsoft.Json;
using NLog;
using System.Diagnostics;
using System.Text;

namespace MP.MONO.UI.Data
{
    public class CurrentDataService : IDisposable
    {
        #region Private Fields

        private static IConfiguration _configuration;
        private static ILogger<CurrentDataService> _logger;
        private static NLog.Logger Log = LogManager.GetCurrentClassLogger();
        private readonly IDistributedCache distributedCache;

        /// <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 Public Fields

        public static MpDbController dbController;

        #endregion Public Fields

        #region Public Constructors

        public CurrentDataService(IConfiguration configuration, ILogger<CurrentDataService> logger, IDistributedCache distributedCache)
        {
            _logger = logger;
            _configuration = configuration;
            // conf cache
            this.distributedCache = distributedCache;
            // conf DB
            string connStr = _configuration.GetConnectionString("MP.MONO.Data");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new MpDbController(configuration);
                _logger.LogInformation("DbController OK");
            }
        }

        #endregion Public Constructors

        #region Protected Properties

        protected Dictionary<string, string> ParametersList { get; set; } = new Dictionary<string, string>();

        #endregion Protected Properties

        #region Private Methods

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

        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 Public Methods

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

        public async Task<Dictionary<string, string>> GetCurrentParameters()
        {
            ParametersList = new Dictionary<string, string>();
            ParametersList.Add("Speed", $"{Random.Shared.Next(0, 5000)}");
            ParametersList.Add("Feed", $"{Random.Shared.Next(0, 10000)}");
            ParametersList.Add("Load", $"{Random.Shared.Next(0, 100)}");
            //return ParametersList;

            var newParamList = Enumerable.Range(1, 10)
                .ToDictionary(x => $"Par{x:00}", x => $"{Random.Shared.Next(0, 1000)}");
            foreach (var item in newParamList)
            {
                ParametersList.Add(item.Key, item.Value);
            }
            await Task.Delay(1);
            return ParametersList;
        }

        public async Task<List<DisplayDataDTO>> MachineDisplay()
        {
            List<DisplayDataDTO>? dbResult = new List<DisplayDataDTO>();
            string cacheKey = mHash("MAPO.MONO:Machine:DisplayData");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<DisplayDataDTO>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.MachineGetDisplay();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                // tolgo salvataggio x sim meglio
                //await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per MachineDisplay: {ts.TotalMilliseconds} ms");
            }
            if (dbResult == null)
            {
                dbResult = new List<DisplayDataDTO>();
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<ProductionDTO> MachineProd()
        {
            ProductionDTO? dbResult = new ProductionDTO();
            string cacheKey = mHash("MAPO.MONO:Machine:Prod");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<ProductionDTO>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.MachineGetProd();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                // tolgo salvataggio x sim meglio
                //await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per MachineProd: {ts.TotalMilliseconds} ms");
            }
            if (dbResult == null)
            {
                dbResult = new ProductionDTO();
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<MachineDTO> MachineStatus()
        {
            MachineDTO? dbResult = new MachineDTO();
            string cacheKey = mHash("MAPO.MONO:Machine:Status");
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<MachineDTO>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.MachineGetStatus();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                // tolgo salvataggio x sim meglio
                //await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Trace($"Effettuata lettura da DB + caching per MachineStatus: {ts.TotalMilliseconds} ms");
            }
            if (dbResult == null)
            {
                dbResult = new MachineDTO();
            }
            return await Task.FromResult(dbResult);
        }

        #endregion Public Methods
    }
}