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;
using PRSServices;
using System;
using PRSServer;

namespace PRSServices;

public abstract class PRSService : ServiceBase
{
    private IEngine? _engine;
    

    private string _servicename;

    private Thread? _thread;

    public PRSService(string serviceName)
    {
        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 virtual Server CreateServer(ServerSettings settings, string serviceName)
    {
        return settings.CreateServer(serviceName);
    }
    protected abstract IEngine? CreateEngine(ServerSettings settings);

    protected virtual ServerSettings GetSettings(string serviceName)
    {
        return GetConfiguration(serviceName).Load();
    }

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

        var svcname = GetServiceName();

        var settings = GetSettings(svcname);
        if (settings != null)
        {
            var server = CreateServer(settings, svcname);

            _engine = CreateEngine(settings);
            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();
    }
}