using EgwCoreLib.Lux.Core.RestPayload;
using EgwMultiEngineManager.Data;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using NLog;
using RestSharp;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

        public ImageCacheService(IConfiguration config, IRedisService redisService)
        {
            _config = config;
            _redisService = redisService;
            svgChannel = _config.GetValue<string>("ServerConf:SvgChannel") ?? "svg:img";
            liveTag = _config.GetValue<string>("ServerConf:ImageLiveTag") ?? "svg";
            cacheTag = _config.GetValue<string>("ServerConf:ImageFileTag") ?? "svgfile";
            calcTag = _config.GetValue<string>("ServerConf:ImageCalcTag") ?? "svg-preview";
            bomChannel = _config.GetValue<string>("ServerConf:BomChannel") ?? "Egw-bom";
            updateChannel = _config.GetValue<string>("ServerConf:UpdateChannel") ?? "Egw-update";
            // 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>
#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

        /// <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>
        /// 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;
            if (imgUID.EndsWith(".svg"))
            {
                imgUID.Replace(".svg","");
            }
            string rndImg = $"{DateTime.Now:HHmmssfff}";
            string fullUrl = $"{baseUrl}/{tag}/{imgUID}-{rndImg}.svg?envir={envir}".Replace("////", "//");
            return fullUrl;
        }

        /// <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}:Images:{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}:Images:{imgId.Replace("/", ":")}";
            var rawVal = await _redisService.GetAsync(currKey);
            return $"{rawVal}";
        }

        /// <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 = $"{bomChannel}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, bomContent);
            return done;
        }

        /// <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 = $"{updateChannel}:{env}";
            // contenuto è UID
            long numSent = await _redisService.PublishAsync(notifyChannel, $"{uid}");
            done = numSent > 0;
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </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 = $"{hmlChannel}:{uid}";
            long numSent = await _redisService.PublishAsync(notifyChannel, rawData);
            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}:Images:{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}:Images:{imgId.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, svgContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{svgChannel}:{imgId}";
            long numSent = await _redisService.PublishAsync(notifyChannel, svgContent);
            return done;
        }

        #endregion Public Methods

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();

        private readonly IRedisService _redisService;

        private readonly string apiUrl = "";

        private readonly string bomChannel = "bom:item";
        private readonly string updateChannel = "ui:update";
        private readonly string cacheTag = "svgfile";
        private readonly string calcTag = "svgpreview";
        private readonly string hmlChannel = "hml:item";
        private readonly string imgBasePath = "";
        private readonly string liveTag = "svg";

        private readonly string svgChannel = "svg:img";

        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
    }
}