using System.Linq;
using System.Text;
using Autofac;
using AutoMapper;
using Jackett.Common.Models;
using Jackett.Common.Models.Config;
using Jackett.Common.Services.Interfaces;
using Jackett.Common.Utils.Clients;
using Microsoft.AspNetCore.Hosting;
using NLog;
#if !NET461
using Microsoft.Extensions.Hosting;
#endif

namespace Jackett.Server
{
    public static class Helper
    {
        public static IContainer ApplicationContainer { get; set; }
        private static bool _automapperInitialised = false;

#if NET461
        public static IApplicationLifetime applicationLifetime;
#else
        public static IHostApplicationLifetime applicationLifetime;
#endif

        public static void Initialize()
        {
            if (_automapperInitialised == false)
            {
                //Automapper only likes being initialized once per app domain.
                //Since we can restart Jackett from the command line it's possible that we'll build the container more than once. (tests do this too)
                InitAutomapper();
                _automapperInitialised = true;
            }

            //Load the indexers
            ServerService.Initalize();

            //Kicks off the update checker
            ServerService.Start();

            Logger.Debug("Helper initialization complete");
        }

        public static void RestartWebHost()
        {
            Logger.Info("Restart of the web application host (not process) initiated");
            Program.isWebHostRestart = true;
            applicationLifetime.StopApplication();
        }

        public static void StopWebHost()
        {
            Logger.Info("Jackett is being stopped");
            applicationLifetime.StopApplication();
        }

        public static IConfigurationService ConfigService
        {
            get
            {
                return ApplicationContainer.Resolve<IConfigurationService>();
            }
        }

        public static IServerService ServerService
        {
            get
            {
                return ApplicationContainer.Resolve<IServerService>();
            }
        }

        public static IServiceConfigService ServiceConfigService
        {
            get
            {
                return ApplicationContainer.Resolve<IServiceConfigService>();
            }
        }

        public static ServerConfig ServerConfiguration
        {
            get
            {
                return ApplicationContainer.Resolve<ServerConfig>();
            }
        }

        public static Logger Logger
        {
            get
            {
                return ApplicationContainer.Resolve<Logger>();
            }
        }

        private static void InitAutomapper()
        {
            Mapper.Initialize(cfg =>
            {
                cfg.CreateMap<WebClientByteResult, WebClientStringResult>().ForMember(x => x.Content, opt => opt.Ignore()).AfterMap((be, str) =>
                {
                    var encoding = be.Request.Encoding ?? Encoding.UTF8;
                    str.Content = encoding.GetString(be.Content);
                });

                cfg.CreateMap<WebClientStringResult, WebClientByteResult>().ForMember(x => x.Content, opt => opt.Ignore()).AfterMap((str, be) =>
                {
                    if (!string.IsNullOrEmpty(str.Content))
                    {
                        var encoding = str.Request.Encoding ?? Encoding.UTF8;
                        be.Content = encoding.GetBytes(str.Content);
                    }
                });

                cfg.CreateMap<WebClientStringResult, WebClientStringResult>();
                cfg.CreateMap<WebClientByteResult, WebClientByteResult>();
                cfg.CreateMap<ReleaseInfo, ReleaseInfo>();

                cfg.CreateMap<ReleaseInfo, TrackerCacheResult>().AfterMap((r, t) =>
                {
                    if (r.Category != null)
                    {
                        t.CategoryDesc = string.Join(", ", r.Category.Select(x => TorznabCatType.GetCatDesc(x)).Where(x => !string.IsNullOrEmpty(x)));
                    }
                    else
                    {
                        t.CategoryDesc = "";
                    }
                });
            });
        }

        public static void SetupLogging(ContainerBuilder builder)
        {
            Logger logger = LogManager.GetCurrentClassLogger();

            if (builder != null)
            {
                builder.RegisterInstance(logger).SingleInstance();
            }
        }

        public static void SetLogLevel(LogLevel level)
        {
            foreach (var rule in LogManager.Configuration.LoggingRules)
            {
                if (rule.LoggerNamePattern == "Microsoft.*")
                {
                    if (!rule.Levels.Contains(LogLevel.Debug))
                    {
                        //don't change the first microsoftRule
                        continue;
                    }

                    var targets = LogManager.Configuration.ConfiguredNamedTargets;
                    if (level == LogLevel.Debug)
                    {
                        foreach (var target in targets)
                        {
                            rule.Targets.Add(target);
                        }
                    }
                    else
                    {
                        foreach (var target in targets)
                        {
                            rule.Targets.Remove(target);
                        }
                    }
                    continue;
                }

                if (level == LogLevel.Debug)
                {
                    if (!rule.Levels.Contains(LogLevel.Debug))
                    {
                        rule.EnableLoggingForLevel(LogLevel.Debug);
                    }
                }
                else
                {
                    if (rule.Levels.Contains(LogLevel.Debug))
                    {
                        rule.DisableLoggingForLevel(LogLevel.Debug);
                    }
                }
            }

            LogManager.ReconfigExistingLoggers();
        }
    }
}