using EgwMultiEngineManager.Data;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using NLog;
using RestSharp;
using StackExchange.Redis;

namespace EgwCoreLib.Lux.Data.Services
{
    public class ImageCacheService
    {
        #region Public Constructors

        public ImageCacheService(IConfiguration config, IRedisService redisService, IConnectionMultiplexer redisConn)
        {
            _config = config;
            _redisService = redisService;
            _redisConn = redisConn;
            _redisDb = redisConn.GetDatabase();
            // conf channels x comunicazione broadcast
            chBom = _config.GetValue<string>("ServerConf:ChannelBom") ?? "lux:bom";
            chHwList = _config.GetValue<string>("ServerConf:ChannelHwList") ?? "lux:hw:list";
            chHwOpt = _config.GetValue<string>("ServerConf:ChannelHwOpt") ?? "lux:hw:opt";
            chPng = _config.GetValue<string>("ServerConf:ChannelPng") ?? "lux:png:img";
            chProfList = _config.GetValue<string>("ServerConf:ChannelProfList") ?? "lux:prof";
            chShape = _config.GetValue<string>("ServerConf:ChannelShape") ?? "lux:shape";
            chSvg = _config.GetValue<string>("ServerConf:ChannelSvg") ?? "lux:svg:img";
            chUpdate = _config.GetValue<string>("ServerConf:ChannelUpdate") ?? "lux:update";
            // conf tag x cache
            liveTag = _config.GetValue<string>("ServerConf:ImageLiveTag") ?? "svg";
            cacheTag = _config.GetValue<string>("ServerConf:ImageFileTag") ?? "svgfile";
            calcTag = _config.GetValue<string>("ServerConf:ImageCalcTag") ?? "svg-preview";
            // verifico la url base
            apiUrl = _config.GetValue<string>("ServerConf:Prog.ApiUrl") ?? "https://iis01.egalware.com/lux/srv/api";
            imgBasePath = _config.GetValue<string>("ServerConf:ImageBaseUrl") ?? "window";
            // fix opzioni base del RestClient
            restOptStd = new RestClientOptions
            {
                Timeout = TimeSpan.FromSeconds(60),
                BaseUrl = new Uri($"{apiUrl}/{imgBasePath}")
            };
            Log.Info("ImageCache Service Started");
        }

        #endregion Public Constructors

        #region Public Methods

        /// <summary>
        /// Effettua una generica chiamata ApiRest
        /// </summary>
        /// <param name="ApiUrl">URL Api di base</param>
        /// <param name="ApiRequest">Richiesta completa</param>
        /// <returns></returns>
        public async Task<RestResponse> CallRestGet(string ApiUrl, string ApiRequest)
        {
            RestResponse response;
            // cerco online
            using (RestClient client = new RestClient(ApiUrl))
            {
                var request = new RestRequest(ApiRequest, Method.Get);
                response = await client.GetAsync(request);
            }
            return response;
        }

        /// <summary>
        /// Effettua una generica chiamata ApiRest
        /// </summary>
        /// <param name="ApiUrl">URL Api di base</param>
        /// <param name="ApiRequest">Richiesta completa</param>
        /// <param name="rawBody">Corpo Json trasmesso con richiesta</param>
        /// <returns></returns>
        public async Task<RestResponse> CallRestPost(string ApiUrl, string ApiRequest, object rawBody)
        {
            RestResponse response;
            // cerco online
            using (RestClient client = new RestClient(ApiUrl))
            {
                var request = new RestRequest(ApiRequest, Method.Post);
                string rawData = JsonConvert.SerializeObject(rawBody);
                request.AddJsonBody(rawData);
                response = await client.ExecutePostAsync(request);
            }
            return response;
        }

        /// <summary>
        /// Esegue flush memoria redis dato pat2Flush
        /// </summary>
        /// <param name="pat2Flush"></param>
        /// <returns></returns>
        public async Task<bool> ExecFlushRedisPatternAsync(RedisValue pat2Flush)
        {
            bool answ = false;
            /*******************************
             * Recupero elenco dei server da cui cancellare le chaivi:
             * - prendo solo i server connessi
             * - prendo solo NON repliche (= master)
             * - me ne aspetto 1 in uscita / prendo primo o default
             *******************************/
            var connServ = _redisConn.GetEndPoints()
                                        .Select(endpoint =>
                                        {
                                            var server = _redisConn.GetServer(endpoint);
                                            return server;
                                        })
                                        .Where(x => x.IsConnected && !x.IsReplica)
                                        .FirstOrDefault();
            if (connServ != null)
            {
                // ciclo (anche se me ne aspetto 1 solo)
                // se pat2Flush è "*" elimino intero DB...
                if ((pat2Flush.Equals(new RedisValue("*")) || pat2Flush == RedisValue.Null))
                {
                    connServ.FlushDatabase(database: _redisDb.Database);
                }
                else
                {
                    try
                    {
                        var keys = connServ.Keys(database: _redisDb.Database, pattern: pat2Flush, pageSize: 1000);

                        var deleteTasks = new List<Task>();
                        foreach (var key in keys)
                        {
                            deleteTasks.Add(_redisDb.KeyDeleteAsync(key));
                            if (deleteTasks.Count >= 1000)
                            {
                                await Task.WhenAll(deleteTasks);
                                deleteTasks.Clear();
                            }
                        }
                        if (deleteTasks.Count > 0)
                        {
                            await Task.WhenAll(deleteTasks);
                        }
                        answ = true;
                    }
                    catch (Exception exc)
                    {
                        Log.Error($"Eccezione durante ExecFlushRedisPatternAsync | pat2Flush: {pat2Flush}{Environment.NewLine}{exc}");
                    }
                }
            }
            else
            {
                Log.Error($"Server REDIS master non trovato");
            }
            return answ;
        }

        /// <summary>
        /// Calcola URL immagine dato
        /// </summary>
        /// <param name="baseUrl">Base url IMG server (da config)</param>
        /// <param name="isLive">Live = in fase di calcolo (cache REDIS), altrimenti da filesystem</param>
        /// <param name="imgUID">UID elemento/immagine</param>
        /// <param name="envir">Environment item</param>
        /// <returns></returns>
        public string ImageUrl(string baseUrl, bool isLive, string imgUID, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS envir = EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS.WINDOW)
        {
            string tag = isLive ? liveTag : cacheTag;
            string fType = "undef";
            if (imgUID.EndsWith(".svg"))
            {
                fType = "svg";
                imgUID.Replace(".svg", "");
            }
            else if (imgUID.EndsWith(".png"))
            {
                fType = "png";
                imgUID.Replace(".png", "");
            }
            switch (envir)
            {
                case Constants.EXECENVIRONMENTS.NULL:
                    break;

                case Constants.EXECENVIRONMENTS.WINDOW:
                    fType = "svg";
                    break;

                case Constants.EXECENVIRONMENTS.BEAM:
                case Constants.EXECENVIRONMENTS.WALL:
                case Constants.EXECENVIRONMENTS.CABINET:
                default:
                    fType = "png";
                    break;
            }

            string rndImg = $"{DateTime.Now:HHmmssfff}";
            string fullUrl = $"{baseUrl}/{tag}/{imgUID}-{rndImg}.{fType}?env={envir}".Replace("////", "//");
            return fullUrl;
        }

        /// <summary>
        /// Rilettura risposta da debug in formato string x riprocessare...
        /// </summary>
        /// <param name="uID"></param>
        /// <param name="env"></param>
        /// <returns></returns>
        public async Task<string> LoadDebug(string uID, Constants.EXECENVIRONMENTS env)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:DEBUG:{env}:{uID}";
            string answ = await _redisService.GetAsync(currKey) ?? "";
            return answ;
        }

        /// <summary>
        /// Recupera img redis PNG x id item richiesto
        /// </summary>
        /// <param name="imgUid">UID item</param>
        /// <param name="envir">Environment item</param>
        public string LoadPng(string imgUid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS envir = EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS.WINDOW)
        {
            // recupero img da cache
            string currKey = $"{redisBaseKey}:{envir}:Img:Png:{imgUid.Replace("/", ":")}";
            var rawVal = _redisService.Get(currKey);
            return $"{rawVal}";
        }

        /// <summary>
        /// Recupera img redis SVG x id item richiesto
        /// </summary>
        /// <param name="imgUid">UID item</param>
        /// <param name="envir">Environment item</param>
        public string LoadSvg(string imgUid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS envir = EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS.WINDOW)
        {
            // recupero img da cache
            string currKey = $"{redisBaseKey}:{envir}:Img:Svg:{imgUid.Replace("/", ":")}";
            var rawVal = _redisService.Get(currKey);
            return $"{rawVal}";
        }

        /// <summary>
        /// Recupera img redis SVG x id item richiesto async
        /// </summary>
        /// <param name="imgId">UID item</param>
        /// <param name="envir">Environment item</param>
        public async Task<string> LoadSvgAsync(string imgId, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS envir = EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS.WINDOW)
        {
            // recupero img da cache
            string currKey = $"{redisBaseKey}:{envir}:Img:Svg:{imgId.Replace("/", ":")}";
            var rawVal = await _redisService.GetAsync(currKey);
            return $"{rawVal}";
        }

        /// <summary>
        /// Salva e invia su channel richiesto un update x UID
        /// è attesao un refresh per chi sottoscrive il canale
        /// </summary>
        /// <param name="env"></param>
        /// <param name="uid"></param>
        public async Task<bool> PublishUpdateAsync(string uid, Constants.EXECENVIRONMENTS env)
        {
            bool done = false;
            // invio notifica sul canale di update generale...
            string notifyChannel = $"{chUpdate}:{env}";
            // contenuto è UID
            long numSent = await _redisService.PublishAsync(notifyChannel, $"{uid}");
            done = numSent > 0;
            return done;
        }

        /// <summary>
        /// Calcola URL immagine dato
        /// </summary>
        /// <param name="baseUrl">Base url IMG server (da config)</param>
        /// <param name="imgUID">UID elemento/immagine</param>
        /// <param name="serJwd">JWD serializzato di cui si richiede l'immagine aggiornata</param>
        /// <returns></returns>
        public string ReqUpdateSvg(string baseUrl, string imgUID, string serJwd)
        {
            string answ = "";
            if (imgUID.EndsWith(".svg"))
            {
                imgUID.Replace(".svg", "");
            }
            string fullUrl = $"{baseUrl}/svg-preview/{imgUID}".Replace("////", "//");

            return answ;
        }

        /// <summary>
        /// Salva e invia su channel BOM redis il doc richiesto
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="env"></param>
        /// <param name="bomContent"></param>
        public async Task<bool> SaveBomAsync(string uid, Constants.EXECENVIRONMENTS env, string bomContent)
        {
            // salvo in cache
            string currKey = $"{redisBaseKey}:{env}:BOM:{uid.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, bomContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{chBom}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, bomContent);
            return done;
        }

        /// <summary>
        /// Salvataggio risposta x debug in formato RAW...
        /// </summary>
        /// <param name="uID"></param>
        /// <param name="env"></param>
        /// <param name="rawData"></param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public async Task<bool> SaveDebug(string uID, Constants.EXECENVIRONMENTS env, string rawData)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:DEBUG:{env}:{uID}";
            var done = await _redisService.SetAsync(currKey, rawData);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel risultato stima per POR (UID.GroupId) richiesto
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="env"></param>
        /// <param name="estimContent"></param>
        public async Task<bool> SaveProdEstimationAsync(string uid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string estimContent)
        {
            // salvo in cache
            string currKey = $"{redisBaseKey}:{env}:Estimation:{uid}";
            var done = await _redisService.SetAsync(currKey, estimContent);
            // invio notifica nuova stima sul canale... viene inviato SOLO che è stata fatta (DONE) x UID (POR)...
            string notifyChannel = $"{chEstimation}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, "DONE");
            //long numSent = await _redisService.PublishAsync(notifyChannel, estimContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel risultato balance per POR (UID.GroupId.Type) richiesto
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="env"></param>
        /// <param name="estimContent"></param>
        public async Task<bool> SaveProdBalanceAsync(string uid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string estimContent)
        {
            // salvo in cache
            string currKey = $"{redisBaseKey}:{env}:Balance:{uid}";
            var done = await _redisService.SetAsync(currKey, estimContent);
            // invio notifica nuova stima sul canale... viene inviato SOLO che è stata fatta (DONE) x UID (POR)...
            string notifyChannel = $"{chBalance}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, "DONE");
            //long numSent = await _redisService.PublishAsync(notifyChannel, estimContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel dedicato HML l'elenco degli HarwareModel (conf preferiti) gestiti
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="rawData"></param>
        public async Task<bool> SaveHmlAsync(string uid, Constants.EXECENVIRONMENTS env, string rawData)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:HML:{uid.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, rawData);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{chHwList}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, rawData);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel l'XML delle HW options per il doc richiesto
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="env"></param>
        /// <param name="xmlContent"></param>
        public async Task<bool> SaveHwOptAsync(string uid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string xmlContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:HwOpt:{uid.Replace("/", ":")}";
            // lascio in cache 15 min x poterlo verificare
            var done = await _redisService.SetAsync(currKey, xmlContent, TimeSpan.FromMinutes(15));
            // invio notifica nuova XML sul canale (inviato solo XML pulito con ID nel canale)
            string notifyChannel = $"{chHwOpt}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, xmlContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="pngContent">contenuto PNG come string base64</param>
        /// <returns></returns>
        public bool SavePng(string imgId, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string pngContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:Img:Png:{imgId.Replace("/", ":")}";
            var done = _redisService.Set(currKey, pngContent);
            // invio notifica nuova imgsvg sul canale... viene "reimbustata"
            string notifyChannel = $"png-gen:{imgId}";
            long numSent = _redisService.Publish(notifyChannel, pngContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis PNG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="env"></param>
        /// <param name="pngContent">contenuto PNG come string base64</param>
        public async Task<bool> SavePngAsync(string imgId, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string pngContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:Img:Png:{imgId.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, pngContent);
            // invio notifica nuova png generata sul canale... viene inviato solo contenuto con ID nel canale
            string notifyChannel = $"{chPng}:{imgId}";
            long numSent = await _redisService.PublishAsync(notifyChannel, "PNG");
            // NON pubblico contenuto che x PNG non serve...
            //long numSent = await _redisService.PublishAsync(notifyChannel, pngContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel profile list gestiti
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="rawData"></param>
        public async Task<bool> SaveProfileListAsync(string uid, Constants.EXECENVIRONMENTS env, string rawData)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:PROF:LIST:{uid.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, rawData);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{chProfList}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, rawData);
            return done;
        }
        /// <summary>
        /// Salva e invia su channel profile threshold x profilo gestiti
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="rawData"></param>
        public async Task<bool> SaveProfileThreshAsync(string uid, Constants.EXECENVIRONMENTS env, string rawData)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:PROF:THRESH:{uid.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, rawData);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{chProfThresh}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, rawData);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel shape per item (UID.GroupId) richiesto
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="env"></param>
        /// <param name="shapeContent"></param>
        public async Task<bool> SaveShapeAsync(string uid, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string shapeContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:Shape:{uid}";
            var done = await _redisService.SetAsync(currKey, shapeContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{chShape}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, shapeContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="svgContent"></param>
        /// <returns></returns>
        public bool SaveSvg(string imgId, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string svgContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:Img:Svg:{imgId.Replace("/", ":")}";
            var done = _redisService.Set(currKey, svgContent);
            // invio notifica nuova imgsvg sul canale... viene "reimbustata"
            string notifyChannel = $"svg-gen:{imgId}";
            long numSent = _redisService.Publish(notifyChannel, svgContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="env"></param>
        /// <param name="svgContent"></param>
        public async Task<bool> SaveSvgAsync(string imgId, EgwMultiEngineManager.Data.Constants.EXECENVIRONMENTS env, string svgContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:{env}:Img:Svg:{imgId.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, svgContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo contenuto con ID nel canale
            string notifyChannel = $"{chSvg}:{imgId}";
            long numSent = await _redisService.PublishAsync(notifyChannel, svgContent);
            return done;
        }

        #endregion Public Methods

        #region Protected Fields

        /// <summary>
        /// Oggetto per la connessione a Redis utilizzato per operazioni di lettura/scrittura.
        /// </summary>
        protected IConnectionMultiplexer _redisConn = null!;

        /// <summary>
        /// Database Redis utilizzato per le operazioni di lettura/scrittura
        /// nb: ottenuto tramite _redisConn.GetDatabase()
        /// </summary>
        protected IDatabase _redisDb = null!;

        #endregion Protected Fields

        /// <summary>
#if false
        /// Effettua una generica chiamata ApiRest
        /// </summary>
        /// <param name="ApiUrl">URL Api di base</param>
        /// <param name="ApiRequest">Richiesta completa</param>
        /// <param name="JsonBody">Corpo Json trasmesso con richiesta</param>
        /// <returns></returns>
        public async Task<RestResponse> CallRestPost(string ApiUrl, string ApiRequest, string JsonBody)
        {
            RestResponse response;
            // cerco online
            using (RestClient client = new RestClient(ApiUrl))
            {
                var request = new RestRequest(ApiRequest, Method.Post);
                string rawData = JsonConvert.SerializeObject(JsonBody);
                request.AddJsonBody(rawData);
                response = await client.ExecutePostAsync(request);
            }
            return response;
        }
#endif

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();

        private readonly IRedisService _redisService;

        private readonly string apiUrl = "";

        private readonly string cacheTag = "svgfile";
        private readonly string calcTag = "svgpreview";
        private readonly string chBalance = "balance:curr";
        private readonly string chBom = "lux:bom";
        private readonly string chEstimation = "estimation:curr";
        private readonly string chHwList = "lux:hw:list";
        private readonly string chHwOpt = "lux:hw:opt";
        private readonly string chPng = "lux:png:img";
        private readonly string chProfList = "lux:prof:list";
        private readonly string chProfThresh = "lux:prof:thresh";
        private readonly string chShape = "shape:curr";
        private readonly string chSvg = "lux:svg:img";
        private readonly string chUpdate = "lux::update";
        private readonly string imgBasePath = "";
        private readonly string liveTag = "svg";
        private IConfiguration _config;

        private string imageBaseUrl = "";

        private string redisBaseKey = "Lux";

        #endregion Private Fields

        #region Private Properties

        /// <summary>
        /// Conf client RestSharp standard:
        /// - base URI al sito
        /// - timeout 1 min
        /// </summary>
        private RestClientOptions restOptStd { get; set; } = new RestClientOptions();

        #endregion Private Properties
    }
}