OnTurretShutdown

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

namespace Oxide.Plugins
{
    [Info("Turret Night Lockdown", "RustPluginGenerator", "1.0.0")]
    [Description("Prevents player-owned AutoTurrets from shutting down while lockdown mode is enabled")]
    public class TurretNightLockdown : RustPlugin
    {
        private const string PermUse = "turretnightlockdown.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Lockdown enabled")]
            public bool LockdownEnabled { get; set; } = true;

            [JsonProperty("Exempt admins")]
            public bool ExemptAdmins { get; set; } = true;
        }

        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>
            {
                ["LockdownOn"] = "Turret lockdown is now ON. Player turrets cannot shut down.",
                ["LockdownOff"] = "Turret lockdown is now OFF.",
                ["NoPermission"] = "You do not have permission to use this command.",
                ["Usage"] = "Usage: /turretlock <on|off|status>",
                ["Status"] = "Turret lockdown is currently {0}."
            }, this);
        }

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

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

        private void Unload()
        {
            SaveConfig();
        }

        [ChatCommand("turretlock")]
        private void CmdTurretLock(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermUse))
            {
                player.ChatMessage(Msg("NoPermission", player.UserIDString));
                return;
            }

            if (args == null || args.Length == 0)
            {
                player.ChatMessage(Msg("Usage", player.UserIDString));
                return;
            }

            switch (args[0].ToLower())
            {
                case "on":
                    config.LockdownEnabled = true;
                    SaveConfig();
                    player.ChatMessage(Msg("LockdownOn", player.UserIDString));
                    break;
                case "off":
                    config.LockdownEnabled = false;
                    SaveConfig();
                    player.ChatMessage(Msg("LockdownOff", player.UserIDString));
                    break;
                case "status":
                    player.ChatMessage(Msg("Status", player.UserIDString, config.LockdownEnabled ? "ON" : "OFF"));
                    break;
                default:
                    player.ChatMessage(Msg("Usage", player.UserIDString));
                    break;
            }
        }

        private object OnTurretShutdown(AutoTurret autoTurret)
        {
            if (autoTurret == null || !config.LockdownEnabled) return null;

            var owner = BasePlayer.FindByID(autoTurret.OwnerID);
            if (owner != null && config.ExemptAdmins && owner.IsAdmin) return null;

            return true; // non-null stops the shutdown, turret stays online
        }
    }
}