OnPlayerUnvanished

using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using Oxide.Core;

namespace Oxide.Plugins
{
    [Info("Vanish Audit", "RustPluginGenerator", "1.0.0")]
    [Description("Logs and optionally announces when a player becomes invisible or visible via debug.invis")]
    public class VanishAudit : RustPlugin
    {
        private const string PermAnnounce = "vanishaudit.announce";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Announce vanish state changes in chat")]
            public bool Announce { get; set; } = true;

            [JsonProperty("Broadcast to all players (false = only the affected player)")]
            public bool Broadcast { get; set; } = false;
        }

        protected override void LoadDefaultConfig() => config = new PluginConfig();

        protected override void LoadConfig()
        {
            base.LoadConfig();
            try
            {
                config = Config.ReadObject<PluginConfig>();
                if (config == null) throw new Exception();
            }
            catch
            {
                PrintWarning("Configuration file is invalid, using defaults");
                LoadDefaultConfig();
            }
            SaveConfig();
        }

        protected override void SaveConfig() => Config.WriteObject(config);

        protected override void LoadDefaultMessages()
        {
            lang.RegisterMessages(new Dictionary<string, string>
            {
                ["Vanished"] = "{0} is now hidden from players.",
                ["Unvanished"] = "{0} is now visible to players again.",
                ["NoPermission"] = "You do not have permission to announce vanish changes."
            }, this);
        }

        private string Msg(string key, string userId = null, params object[] args)
        {
            return string.Format(lang.GetMessage(key, this, userId), args);
        }

        private void Init()
        {
            permission.RegisterPermission(PermAnnounce, this);
        }

        private void OnPlayerVanished(BasePlayer player)
        {
            Handle(player, true);
        }

        private void OnPlayerUnvanished(BasePlayer player)
        {
            Handle(player, false);
        }

        private void Handle(BasePlayer player, bool vanished)
        {
            if (player == null) return;

            string state = vanished ? "vanished" : "unvanished";
            Puts(string.Format("{0} ({1}) is now {2}", player.displayName, player.UserIDString, state));

            if (!config.Announce) return;
            if (!permission.UserHasPermission(player.UserIDString, PermAnnounce)) return;

            string key = vanished ? "Vanished" : "Unvanished";
            string text = Msg(key, null, player.displayName);

            if (config.Broadcast)
            {
                Server.Broadcast(text);
                return;
            }

            player.ChatMessage(text);
        }
    }
}