CanTeleportDeepSea

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

namespace Oxide.Plugins
{
    [Info("Deep Sea Portal Cooldown", "RustPluginGenerator", "1.0.0")]
    [Description("Enforces a per-player cooldown between deep sea portal trips.")]
    public class DeepSeaPortalCooldown : RustPlugin
    {
        private const string PermBypass = "deepseaportalcooldown.bypass";

        private PluginConfig config;
        private readonly Dictionary<ulong, DateTime> cooldowns = new Dictionary<ulong, DateTime>();
        private Timer sweepTimer;

        private class PluginConfig
        {
            [JsonProperty("Cooldown seconds")]
            public int CooldownSeconds = 300;
        }

        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>
            {
                ["Cooldown"] = "You cannot use the deep sea portal for another {0} seconds."
            }, 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(PermBypass, this);
        }

        private void OnServerInitialized()
        {
            sweepTimer = timer.Every(120f, SweepCooldowns);
        }

        private void Unload()
        {
            sweepTimer?.Destroy();
            cooldowns.Clear();
        }

        private object CanTeleportDeepSea(BaseEntity entity, DeepSeaPortal portal)
        {
            if (entity == null || portal == null) return null;

            var player = entity as BasePlayer;
            if (player == null || player.IsNpc) return null;
            if (permission.UserHasPermission(player.UserIDString, PermBypass)) return null;

            DateTime readyAt;
            if (!cooldowns.TryGetValue(player.userID.Get(), out readyAt)) return null;

            double remaining = (readyAt - DateTime.UtcNow).TotalSeconds;
            if (remaining <= 0) return null;

            var phrase = new Translate.Phrase("portal.cooldown", Msg("Cooldown", player.UserIDString, Math.Ceiling(remaining)));
            return (false, phrase);
        }

        private void OnDeepSeaTeleport(BasePlayer player)
        {
            if (player == null || player.IsNpc) return;
            cooldowns[player.userID.Get()] = DateTime.UtcNow.AddSeconds(config.CooldownSeconds);
        }

        private void SweepCooldowns()
        {
            if (cooldowns.Count == 0) return;

            var now = DateTime.UtcNow;
            var expired = new List<ulong>();
            foreach (var entry in cooldowns)
            {
                if (entry.Value <= now) expired.Add(entry.Key);
            }

            for (int i = 0; i < expired.Count; i++) cooldowns.Remove(expired[i]);
        }
    }
}