using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Management;
using System.Reflection;
using System.ServiceProcess;
using System.Threading;
using InABox.Configuration;
using InABox.Core;
using InABox.Logging;
using InABox.IPC;

namespace PRSServer
{
    


    public class PRSService : ServiceBase
    {
        private IEngine? _engine;
        

        private string _servicename;

        private Thread? _thread;
        //private CancellationTokenSource Source = new();

        // TODO: Is this necessary?
        private App app;

        public PRSService(string serviceName, App app)
        {
            this.app = app;

            CanPauseAndContinue = false;
            CanShutdown = true;

            if (string.IsNullOrWhiteSpace(serviceName))
                _servicename = GetServiceName();
            else
                _servicename = serviceName;
            ServiceName = _servicename;
        }

        private string GetServiceName()
        {
            if (string.IsNullOrWhiteSpace(_servicename))
            {
                var processId = Process.GetCurrentProcess().Id;
                var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Service where ProcessId = " + processId);
                var collection = searcher.Get();
                var services = collection.Cast<ManagementBaseObject>();
                _servicename = services.Any() ? (string)services.First()["Name"] : "";
                Logger.Send(LogType.Information, "", string.Format("Service Name is [{0}]", _servicename));
            }

            return _servicename;
        }

        public static LocalConfiguration<T> GetConfiguration<T>(string section = "")
            where T : ILocalConfigurationSettings, new()
        {
            // TODO : Remove the fallback location
            var configuration = new LocalConfiguration<T>(CoreUtils.GetCommonAppData(), section);
            if (!File.Exists(configuration.GetFileName()))
            {
                var oldsettings = new LocalConfiguration<T>(
                    Path.GetDirectoryName(Assembly.GetEntryAssembly()!.Location),
                    ""
                );
                if (File.Exists(oldsettings.GetFileName()))
                {
                    // Transition old data to new location
                    var settings = oldsettings.LoadAll();
                    configuration.SaveAll(settings);
                    File.Delete(oldsettings.GetFileName());
                }
            }
            return configuration;
        }

        public static LocalConfiguration<ServerSettings> GetConfiguration(string section = "") => GetConfiguration<ServerSettings>(section);

        public void Run(string servicename)
        {
            _servicename = servicename;
            OnStart(new string[] { });
        }

        public void Halt()
        {
            OnStop();
        }

        protected override void OnStart(string[] args)
        {
            Logger.OnLog += MainLogger.Send;
            //InABox.Logging.NamedPipeLogger.Start(CoreUtils.GetPath());

            var svcname = GetServiceName();
            
            var settings = GetConfiguration(svcname).Load();
            if (settings != null)
            {
                var server = settings.CreateServer(svcname);

                if (settings.Type == ServerType.Database)
                    _engine = new DatabaseEngine();

                else if (settings.Type == ServerType.GPS)
                    _engine = new GPSEngine();

                else if (settings.Type == ServerType.AutoDiscovery)
                    _engine = new AutoDiscoveryEngine();

                else if (settings.Type == ServerType.Schedule)
                    _engine = new ScheduleEngine();

                else if (settings.Type == ServerType.Web)
                    _engine = new WebEngine();

                else if (settings.Type == ServerType.Certificate)
                    _engine = new CertificateEngine();


                if (_engine != null)
                {
                    _engine.ServiceName = svcname;
                    _engine.Version = CoreUtils.GetVersion();
                    _engine.Configure(server);

                    /*_task = Task.Run(() =>
                    {
                        _engine.Run();
                    }, Source.Token);*/

                    _thread = new Thread(() => { _engine.Run(); });
                    _thread.IsBackground = true;
                    _thread.Start();
                }
            }
        }

        protected override void OnStop()
        {
            Logger.Send(LogType.Information, "", "Shutting down Service: " + _servicename);

            _engine?.Stop();
            /*var timer = new Timer { Interval = 1000 };
            timer.Elapsed += (o, e) =>
            {
                try
                {
                    Logger.Send(LogType.Information, "", "Terminating Process..");
                    MainLogger.Stop();
                    Environment.Exit(0);
                }
                catch (Exception err)
                {
                    Logger.Send(LogType.Error, "", "Exception while killing process: " + err.Message);
                }
            };
            timer.AutoReset = false;
            timer.Enabled = true;*/

            Logger.Send(LogType.Information, "", "Terminating Process..");
            MainLogger.Stop();
        }
    }
}