using MP.Data;
using MP.Data.Conf;
using MP.Data.DatabaseModels;
using Newtonsoft.Json;
using NLog;
using StackExchange.Redis;
using System.Diagnostics;
using System.Text;

namespace MP.Mon.Data
{
    public class MpDataService : IDisposable
    {
        #region Public Constructors

        public MpDataService(IConfiguration configuration, ILogger<MpDataService> logger)
        {
            _logger = logger;
            _configuration = configuration;

            // setup compoenti REDIS
            redisConn = ConnectionMultiplexer.Connect(_configuration.GetConnectionString("Redis"));
            redisDb = redisConn.GetDatabase();
            // setup canali pub/sub
            dataPipe = new MessagePipe(redisConn, Constants.ACT_MSE_DATA_KEY);
            blinkPipe = new MessagePipe(redisConn, Constants.ACT_BLINK_KEY);

            // conf DB
            string connStr = _configuration.GetConnectionString("Mp.Mon");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new MP.Data.Controllers.MpMonController(configuration);
                StringBuilder sb = new StringBuilder();
                sb.AppendLine($"DbController OK");
                _logger.LogInformation(sb.ToString());
            }

            // setup conf IOB da dizionario
            tryLoadIobTags();

            // avvio timers...
            startTimers();
        }

        #endregion Public Constructors

        #region Public Properties

        public static MP.Data.Controllers.MpMonController dbController { get; set; } = null!;

        public MessagePipe blinkPipe { get; set; } = null!;

        /// <summary>
        /// Dizionario dei tag configurati per IOB
        /// </summary>
        public Dictionary<string, List<TagData>> currTagConf { get; set; } = new Dictionary<string, List<TagData>>();

        public MessagePipe dataPipe { get; set; } = null!;

        #endregion Public Properties

        #region Public Methods

        public Task<List<ConfigModel>> ConfigGetAll()
        {
            return Task.FromResult(dbController.ConfigGetAll().ToList());
        }

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

        /// <summary>
        /// Richiesta attivazione --&gt; sposto avanti 1 minuto il periodo limite x fast running
        /// </summary>
        public void doActivate()
        {
            fastLimit = DateTime.Now.AddMinutes(1);
        }

        /// <summary>
        /// Elenco setup dei tag conf correnti
        /// </summary>
        /// <returns></returns>
        public Task<Dictionary<string, List<TagData>>> getAllTags()
        {
            return Task.FromResult(currTagConf);
        }

        /// <summary>
        /// restituisce il valore da REDIS associato al tag richeisto
        /// </summary>
        /// <param name="redKey">Chiave in cui cercare il valore</param>
        /// <returns></returns>
        public string getTagConf(string redKey)
        {
            string outVal = "";
            // cerco in REDIS la conf x l'IOB
            var rawData = redisDb.StringGet(redKey);
            if (!string.IsNullOrEmpty(rawData))
            {
                outVal = $"{rawData}";
            }
            return outVal;
        }

        public Task<List<Macchine>> MacchineGetAll()
        {
            return Task.FromResult(dbController.MacchineGetAll());
        }

        public async Task<List<MappaStatoExpl>> MseGetAll()
        {
            int maxAge = 2000;
            int.TryParse(_configuration.GetValue<string>("ServerConf:maxAge"), out maxAge);
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            List<MappaStatoExpl>? result = new List<MappaStatoExpl>();
            // cerco in redis...
            RedisValue rawData = await redisDb.StringGetAsync(redisMseKey);
            if (!string.IsNullOrEmpty($"{rawData}"))
            {
                result = JsonConvert.DeserializeObject<List<MappaStatoExpl>>($"{rawData}");
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Debug($"Read from REDIS: {ts.TotalMilliseconds}ms");
            }
            else
            {
                result = await Task.FromResult(dbController.MseGetAll(maxAge));
                // serializzp e salvo...
                rawData = JsonConvert.SerializeObject(result);
                await redisDb.StringSetAsync(redisMseKey, rawData, TimeSpan.FromMilliseconds(maxAge));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Debug($"Read from DB: {ts.TotalMilliseconds}ms");
            }
            if (result == null)
            {
                result = new List<MappaStatoExpl>();
            }
            return result;
        }

        #endregion Public Methods

        #region Private Fields

        private static IConfiguration _configuration = null!;

        private static ILogger<MpDataService> _logger = null!;

        private static System.Timers.Timer fastTimer = new System.Timers.Timer(4000);

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

        /// <summary>
        /// Limite in formato data-ora per inviare dati rapidamente (incrementato come now + 1 min
        /// ad ogni chiamata client)
        /// </summary>
        private DateTime fastLimit = DateTime.Now;

        private int fastRefreshMs = 1000;

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

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

        private string redisMseKey = "MP:MON:Cache:MSE";

        #endregion Private Fields

        #region Private Methods

        private void ElapsedFastTimer(object? source, System.Timers.ElapsedEventArgs e)
        {
            var pUpd = Task.Run(async () =>
            {
                // secondi pari --> blink, secondi dispari --> ricarica
                DateTime adesso = DateTime.Now;
                int resto = 0;
                Math.DivRem(adesso.Second, 2, out resto);
                if (resto == 0)
                {
                    // invio in channel blink il segnale
                    blinkPipe.sendMessage("true");
                    Log.Debug("Elapsed Fast Timer Blink");
                }
                else
                {
                    // invio in channel blink segnale false
                    blinkPipe.sendMessage("false");
                    // rileggo dati...
                    var newData = await MseGetAll();
                    // invio tramite la pipe...
                    dataPipe.sendMessage(JsonConvert.SerializeObject(newData));
                    Log.Debug("Elapsed Fast Timer reload");
                }
            });
            pUpd.Wait();
        }

        private void startTimers()
        {
            fastTimer = new System.Timers.Timer(fastRefreshMs);
            fastTimer.Elapsed += ElapsedFastTimer;
            fastTimer.Enabled = true;
            fastTimer.Start();
        }

        /// <summary>
        /// Prova a caricare da file la conf degli IOB se presente
        /// </summary>
        private void tryLoadIobTags()
        {
            Dictionary<string, List<TagData>> currConf = new Dictionary<string, List<TagData>>();
            string strExeFilePath = System.Reflection.Assembly.GetExecutingAssembly().Location;
            if (!string.IsNullOrEmpty(strExeFilePath))
            {
                string? strWorkPath = Path.GetDirectoryName(strExeFilePath);
                if (!string.IsNullOrEmpty(strWorkPath))
                {
                    string filePath = $"{strWorkPath}/Conf/iobTagsConf.json";
                    if (File.Exists(filePath))
                    {
                        string rawData = File.ReadAllText(filePath);
                        if (!string.IsNullOrEmpty(rawData))
                        {
                            var fileConfData = JsonConvert.DeserializeObject<IobTags>(rawData);
                            if (fileConfData != null)
                            {
                                // effettuo esplosione conf SE contenesse il valore "***" = tutti
                                // gli IOB
                                if (fileConfData.IobSetup.ContainsKey("***"))
                                {
                                    // recupero elenco macchine...
                                    var elencoMacc = dbController.MacchineGetAll();
                                    // x ogni macchina creo le righe standard da conf...
                                    var baseConf = fileConfData.IobSetup.Where(x => x.Key == "***").FirstOrDefault();
                                    foreach (var item in elencoMacc)
                                    {
                                        if (!string.IsNullOrEmpty(item.IdxMacchina))
                                        {
                                            // converto i valori x la macchina corrente... clono in
                                            // nuovo oggetto
                                            var specVal = baseConf.Value.Select(i => i.Clone()).ToList();
                                            // sostituisco segnaposto
                                            foreach (var singleVal in specVal)
                                            {
                                                singleVal.TagLocation = singleVal.TagLocation.Replace("***", item.IdxMacchina);
                                            }
                                            // ora aggiungo eventuali valori in override...
                                            if (fileConfData.IobSetup.ContainsKey(item.IdxMacchina))
                                            {
                                                var otConf = fileConfData.IobSetup.Where(x => x.Key == item.IdxMacchina).FirstOrDefault();
                                                //verifico x ogni valore other...
                                                foreach (var otTag in otConf.Value)
                                                {
                                                    var ovrTag = specVal.Where(x => x.ColNum == otTag.ColNum && x.RowNum == otTag.RowNum).FirstOrDefault();
                                                    // se contiene --> sovrascrivo
                                                    if (ovrTag != null)
                                                    {
                                                        //ovrTag = otTag.Clone();
                                                        specVal.Remove(ovrTag);
                                                        specVal.Add(otTag.Clone());
                                                    }
                                                    // se non contiene --> aggiungo
                                                    else
                                                    {
                                                        specVal.Add(otTag);
                                                    }
                                                }
                                            }
                                            currConf.Add(item.IdxMacchina, specVal);
                                        }
                                    }
                                }
                                // altrimenti copio ed ho finito
                                else
                                {
                                    currConf = fileConfData.IobSetup;
                                }
                            }
                        }
                    }
                    if (currConf != null)
                    {
                        currTagConf = currConf;
                    }
                }
            }
        }

        #endregion Private Methods
    }
}