How to make a Rust combat block plugin (block commands in combat)

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

namespace Oxide.Plugins
{
    [Info("Combat Block", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks configured chat commands while a player is in combat for a number of seconds.")]
    public class CombatBlock : RustPlugin
    {
        private const string PermUse = "combatblock.use";
        private const string PermAdmin = "combatblock.admin";

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

        private class PluginConfig
        {
            [JsonProperty("Combat duration in seconds")]
            public float CombatSeconds { get; set; } = 15f;

            [JsonProperty("Ignore team members")]
            public bool IgnoreTeams { get; set; } = true;

            [JsonProperty("Blocked commands (without leading slash)")]
            public List<string> BlockedCommands { get; set; } = new List<string>
            {
                "home", "tpr", "tpa", "kit", "kits", "sethome", "trade", "sell", "outpost"
            };
        }

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

        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>
            {
                ["Blocked"] = "You are in combat. Wait {0}s before using that command.",
                ["StatusActive"] = "You are combat blocked for {0}s.",
                ["StatusIdle"] = "You are not combat blocked.",
                ["Cleared"] = "Removed the combat block for {0}.",
                ["PlayerNotFound"] = "Player not found.",
                ["Reloaded"] = "Configuration reloaded.",
                ["NoPermission"] = "You do not have permission to use that command."
            }, this);
        }

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

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

        private object OnEntityTakeDamage(BaseCombatEntity entity, HitInfo hitInfo)
        {
            if (config == null || config.CombatSeconds <= 0f) return null;
            if (hitInfo == null) return null;

            BasePlayer victim = entity as BasePlayer;
            if (victim == null || victim.IsNpc || !victim.IsConnected) return null;

            BasePlayer attacker = hitInfo.InitiatorPlayer;
            if (attacker == null) attacker = hitInfo.Initiator as BasePlayer;
            if (attacker == null || attacker == victim || attacker.IsNpc) return null;

            if (config.IgnoreTeams)
            {
                ulong team = victim.currentTeam;
                if (team != 0 && team == attacker.currentTeam) return null;
            }

            float end = UnityEngine.Time.realtimeSinceStartup + config.CombatSeconds;
            combatEnd[victim.userID] = end;
            combatEnd[attacker.userID] = end;
            return null;
        }

        private object OnPlayerCommand(BasePlayer player, string cmd, string[] args)
        {
            if (player == null || string.IsNullOrEmpty(cmd) || config == null) return null;
            if (player.IsNpc) return null;

            float remaining = RemainingSeconds(player.userID);
            if (remaining <= 0f) return null;

            string name = cmd.TrimStart('/').ToLowerInvariant();
            if (config.BlockedCommands == null) return null;

            for (int i = 0; i < config.BlockedCommands.Count; i++)
            {
                var entry = config.BlockedCommands[i];
                if (entry == null) continue;
                if (!string.Equals(entry.Trim().ToLowerInvariant(), name)) continue;

                player.ChatMessage(Msg("Blocked", player.UserIDString, Mathf.CeilToInt(remaining)));
                return true;
            }

            return null;
        }

        private float RemainingSeconds(ulong userId)
        {
            float end;
            if (!combatEnd.TryGetValue(userId, out end)) return 0f;
            float remaining = end - UnityEngine.Time.realtimeSinceStartup;
            if (remaining <= 0f)
            {
                combatEnd.Remove(userId);
                return 0f;
            }
            return remaining;
        }

        [ChatCommand("combatblock")]
        private void CmdCombatBlock(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (args == null || args.Length == 0)
            {
                SendReply(player, "Usage: /combatblock status | clear <name|id> | reload");
                return;
            }

            string sub = args[0].ToLowerInvariant();
            if (sub == "status")
            {
                if (!permission.UserHasPermission(player.UserIDString, PermUse))
                {
                    SendReply(player, Msg("NoPermission", player.UserIDString));
                    return;
                }
                float remaining = RemainingSeconds(player.userID);
                if (remaining <= 0f)
                    SendReply(player, Msg("StatusIdle", player.UserIDString));
                else
                    SendReply(player, Msg("StatusActive", player.UserIDString, Mathf.CeilToInt(remaining)));
                return;
            }

            if (sub == "clear" || sub == "reload")
            {
                if (!permission.UserHasPermission(player.UserIDString, PermAdmin))
                {
                    SendReply(player, Msg("NoPermission", player.UserIDString));
                    return;
                }

                if (sub == "reload")
                {
                    LoadConfig();
                    SendReply(player, Msg("Reloaded", player.UserIDString));
                    return;
                }

                if (args.Length < 2)
                {
                    SendReply(player, "Usage: /combatblock clear <name|id>");
                    return;
                }

                string query = string.Join(" ", args, 1, args.Length - 1);
                BasePlayer target = BasePlayer.FindAwakeOrSleeping(query);
                if (target == null)
                {
                    ulong parsed;
                    if (ulong.TryParse(query, out parsed)) target = BasePlayer.FindByID(parsed);
                }
                if (target == null)
                {
                    SendReply(player, Msg("PlayerNotFound", player.UserIDString));
                    return;
                }

                combatEnd.Remove(target.userID);
                SendReply(player, Msg("Cleared", player.UserIDString, target.displayName));
                return;
            }

            SendReply(player, "Usage: /combatblock status | clear <name|id> | reload");
        }
    }
}