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

namespace GWMS.UI.Data
{
    public class GWMSDataService
    {
        #region Private Fields

        private static IConfiguration _configuration;
        private static ILogger<GWMSDataService> _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 GWMS.Data.Controllers.GWMSController dbController;

        #endregion Public Fields

        #region Public Constructors

        public GWMSDataService(IConfiguration configuration, ILogger<GWMSDataService> logger, IMemoryCache memoryCache, IDistributedCache distributedCache)
        {
            _logger = logger;
            _configuration = configuration;
            // conf cache
            this.memoryCache = memoryCache;
            this.distributedCache = distributedCache;
            // conf DB
            string connStr = _configuration.GetConnectionString("GWMS.Data");
            if (string.IsNullOrEmpty(connStr))
            {
                _logger.LogError("ConnString empty!");
            }
            else
            {
                dbController = new GWMS.Data.Controllers.GWMSController(configuration);
                StringBuilder sb = new StringBuilder();
                sb.AppendLine($"DbController OK");
                _logger.LogInformation(sb.ToString());
            }
        }

        #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, SelectOrderData CurrFilter)
        {
            string answ = $"{TableName}:P_{CurrFilter.PlantId:00}:S_{CurrFilter.SupplierId:00}:T_{CurrFilter.TransporterId:00}:D_{CurrFilter.DateStart:yyyyMMddHHmm}_{CurrFilter.DateEnd:yyyyMMddHHmm}";
            return answ;
        }

        #endregion Protected Methods

        #region Public Methods

        public async Task<List<GWMS.Data.DatabaseModels.ConfigModel>> ConfigGetAll()
        {
            //return Task.FromResult(dbController.ActionsGetAll());
            List<GWMS.Data.DatabaseModels.ConfigModel> dbResult = new List<GWMS.Data.DatabaseModels.ConfigModel>();
            string cacheKey = "DATA:CONFIG";
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<GWMS.Data.DatabaseModels.ConfigModel>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetConfig();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(false));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Info($"Effettuata lettura da DB + caching per ConfigGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

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

        public async Task<List<GWMS.Data.DatabaseModels.ItemModel>> ItemsGetAll()
        {
            //return Task.FromResult(dbController.ActionsGetAll());
            List<GWMS.Data.DatabaseModels.ItemModel> dbResult = new List<GWMS.Data.DatabaseModels.ItemModel>();
            string cacheKey = "DATA:ITEMS";
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<GWMS.Data.DatabaseModels.ItemModel>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetItems();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(false));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Info($"Effettuata lettura da DB + caching per ItemsGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<List<OrderModel>> OrdersGetFilt(SelectOrderData CurrFilter)
        {
            List<OrderModel> dbResult = new List<OrderModel>();

            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.GetOrdersFilt(CurrFilter.PlantId, CurrFilter.SupplierId, CurrFilter.TransporterId, CurrFilter.DateStart, CurrFilter.DateEnd);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Info($"Effettuata lettura da DB per OrdersGetFilt: {ts.TotalMilliseconds} ms");

            return await Task.FromResult(dbResult);
        }

        public void OrderUpdate(OrderModel currItem)
        {
            try
            {
                dbController.OrderUpdate(currItem);
            }
            catch
            {
            }
        }

        public async Task<List<PlantDTO>> PlantsGetAll()
        {
            List<PlantDTO> dbResult = new List<PlantDTO>();
            string cacheKey = "DATA:PLANTS:ListDTO";
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<PlantDTO>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetPlantsDTO();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Info($"Effettuata lettura da DB + caching per PlantsGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<bool> RegenDB(int numDays, int stepMin = 30, int maxHourRate = 800)
        {
            return await Task.FromResult(dbController.RegenDB(1, numDays, stepMin, maxHourRate));
        }

        public void rollBackEdit(object item)
        {
            dbController.rollBackEntity(item);
        }

        public async Task<List<SupplierModel>> SuppliersGetAll()
        {
            List<SupplierModel> dbResult = new List<SupplierModel>();
            string cacheKey = "DATA:SUPPL:List";
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<SupplierModel>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetSuppliers();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Info($"Effettuata lettura da DB + caching per PlantsGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<List<TransporterModel>> TransportersGetAll()
        {
            List<TransporterModel> dbResult = new List<TransporterModel>();
            string cacheKey = $"DATA:TRANSP:List";
            string rawData;
            var redisDataList = await distributedCache.GetAsync(cacheKey);
            if (redisDataList != null)
            {
                rawData = Encoding.UTF8.GetString(redisDataList);
                dbResult = JsonConvert.DeserializeObject<List<TransporterModel>>(rawData);
            }
            else
            {
                Stopwatch stopWatch = new Stopwatch();
                stopWatch.Start();
                dbResult = dbController.GetTransporters();
                rawData = JsonConvert.SerializeObject(dbResult);
                redisDataList = Encoding.UTF8.GetBytes(rawData);
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
                stopWatch.Stop();
                TimeSpan ts = stopWatch.Elapsed;
                Log.Info($"Effettuata lettura da DB + caching per PlantsGetAll: {ts.TotalMilliseconds} ms");
            }
            return await Task.FromResult(dbResult);
        }

        public async Task<List<UserModel>> UsersGetFilt(UserLevel UsrLvl, int PlantId, int SupplierId, int TransporterId)
        {
            List<UserModel> dbResult = new List<UserModel>();

            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.GetUsersFilt(UsrLvl, PlantId, SupplierId, TransporterId);
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Info($"Effettuata lettura da DB per UsersGetFilt: {ts.TotalMilliseconds} ms");

            return await Task.FromResult(dbResult);
        }

        public void UserUpdate(UserModel currItem)
        {
            try
            {
                dbController.UserUpdate(currItem);
            }
            catch
            {
            }
        }

        public async void WeekPlanDelete(WeekPlanModel currItem)
        {
            try
            {
                //dbController.ResetController();
                dbController.WeekPlanDelete(currItem);
                string cacheKey = $"DATA:WEEKPLAN:List";
                var redisDataList = Encoding.UTF8.GetBytes("");
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
            }
            catch
            {
            }
        }

        public async Task<List<WeekPlanModel>> WeekPlanGet()
        {
            List<WeekPlanModel> dbResult = new List<WeekPlanModel>();

            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            dbResult = dbController.GetWeekPlan();
            stopWatch.Stop();
            TimeSpan ts = stopWatch.Elapsed;
            Log.Info($"Effettuata lettura da DB + caching per WeekPlanGet: {ts.TotalMilliseconds} ms");
            return await Task.FromResult(dbResult);
        }

        public async void WeekPlanUpdate(WeekPlanModel currItem)
        {
            try
            {
                //dbController.ResetController();
                dbController.WeekPlanUpdate(currItem);
                string cacheKey = $"DATA:WEEKPLAN:List";
                var redisDataList = Encoding.UTF8.GetBytes("");
                await distributedCache.SetAsync(cacheKey, redisDataList, cacheOpt(true));
            }
            catch
            {
            }
        }

        #endregion Public Methods
    }
}