using System;

namespace Server.Misc
{
  public class AutoRestart : Timer
  {
    public static bool Enabled; // is the script enabled?

    private static TimeSpan RestartTime = TimeSpan.FromHours(2.0); // time of day at which to restart

    private static TimeSpan
      RestartDelay =
        TimeSpan.Zero; // how long the server should remain active before restart (period of 'server wars')

    private static TimeSpan
      WarningDelay = TimeSpan.FromMinutes(1.0); // at what interval should the shutdown message be displayed?

    private static DateTime m_RestartTime;

    public AutoRestart() : base(TimeSpan.FromSeconds(1.0), TimeSpan.FromSeconds(1.0))
    {
      Priority = TimerPriority.FiveSeconds;

      m_RestartTime = DateTime.UtcNow.Date + RestartTime;

      if (m_RestartTime < DateTime.UtcNow)
        m_RestartTime += TimeSpan.FromDays(1.0);
    }

    public static bool Restarting{ get; private set; }

    public static void Initialize()
    {
      CommandSystem.Register("Restart", AccessLevel.Administrator, Restart_OnCommand);
      new AutoRestart().Start();
    }

    public static void Restart_OnCommand(CommandEventArgs e)
    {
      if (Restarting)
      {
        e.Mobile.SendMessage("The server is already restarting.");
      }
      else
      {
        e.Mobile.SendMessage("You have initiated server shutdown.");
        Enabled = true;
        m_RestartTime = DateTime.UtcNow;
      }
    }

    private void Warning_Callback()
    {
      World.Broadcast(0x22, true, "The server is going down shortly.");
    }

    private void Restart_Callback()
    {
      Core.Kill(true);
    }

    protected override void OnTick()
    {
      if (Restarting || !Enabled)
        return;

      if (DateTime.UtcNow < m_RestartTime)
        return;

      if (WarningDelay > TimeSpan.Zero)
      {
        Warning_Callback();
        DelayCall(WarningDelay, WarningDelay, Warning_Callback);
      }

      AutoSave.Save();

      Restarting = true;

      DelayCall(RestartDelay, Restart_Callback);
    }
  }
}