ModernUO/Projects/Scripts/Commands/VisibilityList.cs

using System.Collections.Generic;
using Server.Mobiles;
using Server.Network;
using Server.Targeting;

namespace Server.Commands
{
  public class VisibilityList
  {
    public static void Initialize()
    {
      EventSink.Login += OnLogin;

      CommandSystem.Register("Vis", AccessLevel.Counselor, Vis_OnCommand);
      CommandSystem.Register("VisList", AccessLevel.Counselor, VisList_OnCommand);
      CommandSystem.Register("VisClear", AccessLevel.Counselor, VisClear_OnCommand);
    }

    public static void OnLogin(LoginEventArgs e)
    {
      if (e.Mobile is PlayerMobile pm) pm.VisibilityList.Clear();
    }

    [Usage("Vis")]
    [Description(
      "Adds or removes a targeted player from your visibility list.  Anyone on your visibility list will be able to see you at all times, even when you're hidden.")]
    public static void Vis_OnCommand(CommandEventArgs e)
    {
      if (e.Mobile is PlayerMobile)
      {
        e.Mobile.Target = new VisTarget();
        e.Mobile.SendMessage("Select person to add or remove from your visibility list.");
      }
    }

    [Usage("VisList")]
    [Description("Shows the names of everyone in your visibility list.")]
    public static void VisList_OnCommand(CommandEventArgs e)
    {
      if (e.Mobile is PlayerMobile pm)
      {
        List<Mobile> list = pm.VisibilityList;

        if (list.Count > 0)
        {
          pm.SendMessage("You are visible to {0} mobile{1}:", list.Count, list.Count == 1 ? "" : "s");

          for (int i = 0; i < list.Count; ++i)
            pm.SendMessage("#{0}: {1}", i + 1, list[i].Name);
        }
        else
          pm.SendMessage("Your visibility list is empty.");
      }
    }

    [Usage("VisClear")]
    [Description("Removes everyone from your visibility list.")]
    public static void VisClear_OnCommand(CommandEventArgs e)
    {
      if (e.Mobile is PlayerMobile pm)
      {
        List<Mobile> list = new List<Mobile>(pm.VisibilityList);

        pm.VisibilityList.Clear();
        pm.SendMessage("Your visibility list has been cleared.");

        for (int i = 0; i < list.Count; ++i)
        {
          Mobile m = list[i];

          if (!m.CanSee(pm) && Utility.InUpdateRange(m, pm))
            Packets.SendRemoveEntity(m.NetState, pm.Serial);
        }
      }
    }

    private class VisTarget : Target
    {
      public VisTarget() : base(-1, false, TargetFlags.None)
      {
      }

      protected override void OnTarget(Mobile from, object targeted)
      {
        if (!(from is PlayerMobile pm) || !(targeted is Mobile targ))
        {
          from.SendMessage("Add only mobiles to your visibility list.");
          return;
        }

        if (targ.AccessLevel > pm.AccessLevel)
        {
          pm.SendMessage("They can already see you!");
          return;
        }

        List<Mobile> list = pm.VisibilityList;

        if (list.Contains(targ))
        {
          list.Remove(targ);
          pm.SendMessage("{0} has been removed from your visibility list.", targ.Name);
        }
        else
        {
          list.Add(targ);
          pm.SendMessage("{0} has been added to your visibility list.", targ.Name);
        }

        if (Utility.InUpdateRange(targ, from))
        {
          NetState ns = targ.NetState;

          if (ns != null)
          {
            if (targ.CanSee(pm))
            {
              Packets.SendMobileIncoming(ns, targ, pm);

              if (ObjectPropertyList.Enabled)
              {
                pm.PropertyList.Send(ns);

                foreach (Item item in pm.Items)
                  item.PropertyList.SendOPLInfo(ns);
              }
            }
            else
              Packets.SendRemoveEntity(ns, pm.Serial);
          }
        }
      }
    }
  }
}