How to make a Rust raid schedule plugin (raid hours)

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

namespace Oxide.Plugins
{
    [Info("Raid Schedule", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks player damage to player buildings and deployables outside configured daily raid windows.")]
    public class RaidSchedule : RustPlugin
    {
        private const string PermUse = "raidschedule.use";
        private const string PermAdmin = "raidschedule.admin";

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

        private class RaidWindow
        {
            [JsonProperty("Start (HH:mm)")] public string Start = "18:00";
            [JsonProperty("End (HH:mm)")] public string End = "22:00";
            [JsonProperty("Days (empty = every day)")] public string[] Days = new string[0];
        }

        private class PluginConfig
        {
            [JsonProperty("Enabled")] public bool Enabled = true;
            [JsonProperty("Block deployables (doors, boxes, turrets)")] public bool BlockDeployables = true;
            [JsonProperty("Notify the attacker")] public bool NotifyAttacker = true;
            [JsonProperty("Notice cooldown (seconds)")] public float NotifyCooldownSeconds = 15f;
            [JsonProperty("Raid windows")] public List<RaidWindow> Windows = new List<RaidWindow>();
        }

        private class ParsedWindow
        {
            public int Start;
            public int End;
            public bool Overnight;
            public HashSet<DayOfWeek> Days; // null = every day
        }

        private readonly List<ParsedWindow> windows = new List<ParsedWindow>();

        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();
            ParseWindows();
        }

        protected override void SaveConfig() => Config.WriteObject(config);

        protected override void LoadDefaultMessages()
        {
            lang.RegisterMessages(new Dictionary<string, string>
            {
                ["ClosedChat"] = "Raiding is closed right now. Damage to player buildings is blocked. Next opening: {0}",
                ["OpenChat"] = "Raiding is open right now. Raid windows end at the configured time.",
                ["Disabled"] = "Raiding is currently disabled server-wide by an admin.",
                ["AttackerBlocked"] = "Raiding is closed. You cannot damage player structures right now.",
                ["Toggled"] = "Raid schedule gating is now {0}.",
                ["Reloaded"] = "Config reloaded. {0} raid window(s) active.",
                ["StatusConsole"] = "Raid schedule: {0} | Windows: {1}",
                ["NoPermission"] = "You do not have permission to use this command."
            }, this);
        }

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

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

        private void ParseWindows()
        {
            windows.Clear();
            if (config.Windows == null) return;
            foreach (var w in config.Windows)
            {
                int start, end;
                if (!TryParseMinutes(w.Start, out start) || !TryParseMinutes(w.End, out end))
                {
                    PrintWarning($"Skipping invalid raid window '{w.Start}' - '{w.End}'");
                    continue;
                }

                HashSet<DayOfWeek> days = null;
                if (w.Days != null && w.Days.Length > 0)
                {
                    days = new HashSet<DayOfWeek>();
                    foreach (var d in w.Days)
                    {
                        DayOfWeek parsed;
                        if (Enum.TryParse(d, true, out parsed)) days.Add(parsed);
                    }
                    if (days.Count == 0)
                    {
                        PrintWarning($"Raid window '{w.Start}' - '{w.End}' has no valid day names, treating as every day");
                        days = null;
                    }
                }

                windows.Add(new ParsedWindow
                {
                    Start = start,
                    End = end,
                    Overnight = end < start,
                    Days = days
                });
            }
        }

        private static bool TryParseMinutes(string value, out int minutes)
        {
            minutes = 0;
            if (string.IsNullOrEmpty(value)) return false;
            var parts = value.Split(':');
            if (parts.Length != 2) return false;
            int h, m;
            if (!int.TryParse(parts[0], out h) || !int.TryParse(parts[1], out m)) return false;
            if (h < 0 || h > 23 || m < 0 || m > 59) return false;
            minutes = h * 60 + m;
            return true;
        }

        private bool IsRaidOpen()
        {
            return IsOpenAt(DateTime.Now);
        }

        private bool IsOpenAt(DateTime now)
        {
            int minute = now.Hour * 60 + now.Minute;
            var today = now.DayOfWeek;
            var yesterday = now.AddDays(-1).DayOfWeek;
            foreach (var w in windows)
            {
                if (w.Overnight)
                {
                    if (minute >= w.Start && DayMatches(w, today)) return true;
                    if (minute < w.End && DayMatches(w, yesterday)) return true;
                }
                else
                {
                    if (minute >= w.Start && minute < w.End && DayMatches(w, today)) return true;
                }
            }
            return false;
        }

        private static bool DayMatches(ParsedWindow w, DayOfWeek day)
        {
            return w.Days == null || w.Days.Contains(day);
        }

        private string NextOpening()
        {
            var now = DateTime.Now;
            for (int i = 0; i <= 10080; i++)
            {
                var probe = now.AddMinutes(i);
                if (IsOpenAt(probe)) return probe.ToString("ddd HH:mm");
            }
            return "-";
        }

        private object OnEntityTakeDamage(BaseCombatEntity entity, HitInfo hitInfo)
        {
            if (!config.Enabled || entity == null || hitInfo == null) return null;
            if (hitInfo.damageTypes == null) return null;

            var attacker = hitInfo.InitiatorPlayer ?? hitInfo.Initiator as BasePlayer;
            if (attacker == null) return null;

            if (!IsRaidTarget(entity)) return null;

            var ownerId = entity.OwnerID;
            if (ownerId == attacker.userID.Get()) return null;

            if (IsRaidOpen()) return null;

            if (config.NotifyAttacker)
            {
                float now = Time.realtimeSinceStartup;
                float last;
                if (!lastNotice.TryGetValue(attacker.userID, out last) || now - last >= config.NotifyCooldownSeconds)
                {
                    lastNotice[attacker.userID] = now;
                    attacker.ChatMessage(Msg("AttackerBlocked", attacker.UserIDString));
                }
            }

            return true;
        }

        private bool IsRaidTarget(BaseCombatEntity entity)
        {
            if (entity is BuildingBlock) return true;
            if (config.BlockDeployables && entity.OwnerID != 0) return true;
            return false;
        }

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

            if (!config.Enabled)
            {
                player.ChatMessage(Msg("Disabled", player.UserIDString));
                return;
            }

            if (IsRaidOpen())
            {
                player.ChatMessage(Msg("OpenChat", player.UserIDString));
                return;
            }

            player.ChatMessage(Msg("ClosedChat", player.UserIDString, NextOpening()));
        }

        [ConsoleCommand("raid.schedule")]
        private void CcmdSchedule(ConsoleSystem.Arg arg)
        {
            var player = arg.Player();
            if (player != null && !permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                arg.ReplyWith(Msg("NoPermission"));
                return;
            }

            var action = arg.GetString(0, "status").ToLowerInvariant();
            switch (action)
            {
                case "toggle":
                    config.Enabled = !config.Enabled;
                    SaveConfig();
                    arg.ReplyWith(Msg("Toggled", null, config.Enabled ? "enabled" : "disabled"));
                    break;
                case "reload":
                    LoadConfig();
                    arg.ReplyWith(Msg("Reloaded", null, windows.Count));
                    break;
                default:
                    arg.ReplyWith(Msg("StatusConsole", null, config.Enabled ? (IsRaidOpen() ? "open" : "closed") : "disabled", windows.Count));
                    break;
            }
        }
    }
}