using System;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using Butterfly.Core;
using Butterfly;

namespace Butterfly_Emulator
{
    internal class Program
    {
        private static bool ProgramLoaded = false;

        [DllImport("Kernel32")]
        private static extern bool SetConsoleCtrlHandler(EventHandler handler, bool add);

        private delegate bool EventHandler(CtrlType sig);
        static EventHandler _handler;

        enum CtrlType
        {
            CTRL_C_EVENT = 0,
            CTRL_BREAK_EVENT = 1,
            CTRL_CLOSE_EVENT = 2,
            CTRL_LOGOFF_EVENT = 5,
            CTRL_SHUTDOWN_EVENT = 6
        }

        [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.ControlAppDomain)]
        internal static void Main()
        {
            Console.CursorVisible = false;
            AppDomain currentDomain = AppDomain.CurrentDomain;
            currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyHandler);

            _handler += new EventHandler(Shutdown);
            SetConsoleCtrlHandler(_handler, true);

            try
            {
                ButterflyEnvironment.Initialize();
                ProgramLoaded = true;
            }
            catch (Exception e)
            {
                Console.Write(e.ToString());
            }

            while (true)
                Console.ReadKey();
        }

        static void MyHandler(object sender, UnhandledExceptionEventArgs args)
        {
            Logging.DisablePrimaryWriting();
            Exception e = (Exception)args.ExceptionObject;
            Logging.LogCriticalException(e.ToString());
            ButterflyEnvironment.SendMassMessage("A fatal error crashed the server, server shutting down.");
            ButterflyEnvironment.PreformShutDown(true);
        }

        private static bool Shutdown(CtrlType sig)
        {
            if (ProgramLoaded)
            {
                Logging.LogMessage("Server exiting at " + DateTime.Now);
                Logging.DisablePrimaryWriting();
                Console.WriteLine("The server is saving users furniture, rooms, etc. WAIT FOR THE SERVER TO CLOSE, DO NOT EXIT THE PROCESS IN TASK MANAGER!!");

                ButterflyEnvironment.PreformShutDown(true);
            }
            return true;
        }
    }
}