OnApartmentRoomUpgrade

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

namespace Oxide.Plugins
{
    [Info("Apartment Upgrade Gate", "RustPluginGenerator", "1.0.0")]
    [Description("Requires a permission per apartment size and rate-limits upgrade attempts.")]
    public class ApartmentUpgradeGate : RustPlugin
    {
        private const string PermSmall = "apartmentupgradegate.small";
        private const string PermMedium = "apartmentupgradegate.medium";
        private const string PermLarge = "apartmentupgradegate.large";

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

        private class PluginConfig
        {
            [JsonProperty("Cooldown seconds between attempts")]
            public float CooldownSeconds = 5f;
        }

        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>
            {
                ["NoPermission"] = "You do not have permission to upgrade to this apartment size.",
                ["Cooldown"] = "Please wait {0} more seconds before upgrading again."
            }, 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(PermSmall, this);
            permission.RegisterPermission(PermMedium, this);
            permission.RegisterPermission(PermLarge, this);
        }

        private object OnApartmentRoomUpgrade(ApartmentRoom playerApartment, BasePlayer player, ApartmentSize size, ApartmentBuilding apartmentBuilding)
        {
            if (player == null || playerApartment == null)
                return null;

            float now = Time.realtimeSinceStartup;
            float last;
            if (lastAttempt.TryGetValue(player.userID.Get(), out last))
            {
                float remaining = config.CooldownSeconds - (now - last);
                if (remaining > 0f)
                {
                    player.ChatMessage(Msg("Cooldown", player.UserIDString, Mathf.CeilToInt(remaining)));
                    return false;
                }
            }
            lastAttempt[player.userID.Get()] = now;

            string perm = PermissionForSize(size);
            if (perm != null && !permission.UserHasPermission(player.UserIDString, perm))
            {
                player.ChatMessage(Msg("NoPermission", player.UserIDString));
                return false;
            }

            return null;
        }

        private static string PermissionForSize(ApartmentSize size)
        {
            string name = size.ToString().ToLowerInvariant();
            if (name.Contains("medium") || name.Contains("middle")) return PermMedium;
            if (name.Contains("large") || name.Contains("big")) return PermLarge;
            return PermSmall;
        }

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