OnTeamDisband

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

namespace Oxide.Plugins
{
    [Info("Team Disband Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Prevents protected teams with multiple members from being disbanded")]
    public class TeamDisbandGuard : RustPlugin
    {
        private const string PermProtected = "teamdisbandguard.protected";
        private const string PermAdmin = "teamdisbandguard.admin";

        private PluginConfig config;
        private readonly Dictionary<ulong, float> lastWarn = new Dictionary<ulong, float>();

        private class PluginConfig
        {
            [JsonProperty("Minimum members to protect")]
            public int MinimumMembers = 2;

            [JsonProperty("Warning cooldown seconds")]
            public float WarningCooldown = 10f;
        }

        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>
            {
                ["DisbandBlocked"] = "Your team cannot be disbanded while it has {0} members. Members must leave individually.",
                ["ProtectionOn"] = "Team disband protection is now enabled for your team.",
                ["ProtectionOff"] = "Team disband protection is now disabled for your team."
            }, 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(PermProtected, this);
            permission.RegisterPermission(PermAdmin, this);
        }

        private object OnTeamDisband(RelationshipManager.PlayerTeam teamToDisband)
        {
            if (teamToDisband == null || teamToDisband.members == null) return null;
            if (teamToDisband.members.Count < config.MinimumMembers) return null;

            bool isProtected = false;
            foreach (ulong memberId in teamToDisband.members)
            {
                if (permission.UserHasPermission(memberId.ToString(), PermProtected))
                {
                    isProtected = true;
                    break;
                }
            }
            if (!isProtected) return null;

            float now = Time.realtimeSinceStartup;
            foreach (ulong memberId in teamToDisband.members)
            {
                if (lastWarn.TryGetValue(memberId, out float last) && now - last < config.WarningCooldown) continue;
                lastWarn[memberId] = now;
                BasePlayer player = BasePlayer.FindByID(memberId);
                if (player == null || !player.IsConnected) continue;
                player.ChatMessage(Msg("DisbandBlocked", player.UserIDString, teamToDisband.members.Count));
            }

            return true;
        }

        [ChatCommand("teamguard")]
        private void CmdTeamGuard(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                SendReply(player, "You do not have permission to use this command.");
                return;
            }
            if (permission.UserHasPermission(player.UserIDString, PermProtected))
            {
                permission.RevokeUserPermission(player.UserIDString, PermProtected);
                SendReply(player, Msg("ProtectionOff", player.UserIDString));
            }
            else
            {
                permission.GrantUserPermission(player.UserIDString, PermProtected, this);
                SendReply(player, Msg("ProtectionOn", player.UserIDString));
            }
        }

        private void Unload()
        {
            lastWarn.Clear();
        }
    }
}