How to make a Rust PvE raid hours plugin (weekly raid windows)

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

namespace Oxide.Plugins
{
    [Info("PveRaidHours", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks player and building damage outside configured weekly raid windows.")]
    public class PveRaidHours : RustPlugin
    {
        private const string PermAdmin = "pveraidhours.admin";

        private PluginConfig config;

        private class Window
        {
            [JsonProperty("Day")]
            public string Day = "Saturday";
            [JsonProperty("StartHour")]
            public int StartHour = 18;
            [JsonProperty("EndHour")]
            public int EndHour = 22;
        }

        private class PluginConfig
        {
            [JsonProperty("BlockPlayerDamage")]
            public bool BlockPlayerDamage = true;
            [JsonProperty("BlockBuildingDamage")]
            public bool BlockBuildingDamage = true;
            [JsonProperty("IgnoreSameTeam")]
            public bool IgnoreSameTeam = true;
            [JsonProperty("RaidWindows")]
            public List<Window> RaidWindows = new List<Window>
            {
                new Window { Day = "Saturday", StartHour = 18, EndHour = 22 },
                new Window { Day = "Sunday", StartHour = 14, EndHour = 18 }
            };
        }

        private static readonly string[] DayNames =
        {
            "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
        };

        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>
            {
                ["RaidOpen"] = "Raiding is currently <color=#7ec850>allowed</color>. This window ends at {0}:00.",
                ["RaidClosed"] = "Raiding is currently <color=#d9534f>blocked</color>. Next window: {0} {1}:00 - {2}:00 (in {3}).",
                ["NoWindows"] = "Raiding is <color=#d9534f>blocked</color>. No raid windows are configured.",
                ["InMinutes"] = "{0} minutes",
                ["InHours"] = "{0} hours {1} minutes",
                ["NoPermission"] = "You do not have permission to use this command."
            }, 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(PermAdmin, this);
        }

        private void OnServerInitialized()
        {
            Puts("PveRaidHours active with " + (config.RaidWindows?.Count ?? 0) + " raid window(s).");
        }

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

            var attacker = hitInfo.InitiatorPlayer;
            if (attacker == null || attacker.IsNpc) return null;

            if (entity is BasePlayer victimPlayer && config.BlockPlayerDamage)
            {
                if (victimPlayer == attacker || victimPlayer.IsNpc) return null;
                if (config.IgnoreSameTeam && attacker.currentTeam != 0 && attacker.currentTeam == victimPlayer.currentTeam) return null;
                if (!IsRaidTime()) return true;
                return null;
            }

            var building = entity as BuildingBlock;
            if (building != null && config.BlockBuildingDamage)
            {
                if (building.OwnerID == 0 || building.OwnerID == attacker.userID.Get()) return null;
                if (!IsRaidTime()) return true;
            }

            return null;
        }

        private int DayIndexOf(string name)
        {
            if (string.IsNullOrEmpty(name)) return -1;
            return Array.FindIndex(DayNames, d => d.Equals(name, StringComparison.OrdinalIgnoreCase));
        }

        private bool IsRaidTime()
        {
            var now = DateTime.Now;
            int dayIndex = (int)now.DayOfWeek;
            double hour = now.Hour + now.Minute / 60.0;

            foreach (var window in config.RaidWindows)
            {
                if (window == null) continue;
                int windowDay = DayIndexOf(window.Day);
                if (windowDay < 0) continue;

                int start = Mathf.Clamp(window.StartHour, 0, 24);
                int end = Mathf.Clamp(window.EndHour, 0, 24);

                if (start < end)
                {
                    if (windowDay == dayIndex && hour >= start && hour < end) return true;
                }
                else if (start > end)
                {
                    // Window crosses midnight: evening part on windowDay, morning part on the following day.
                    int nextDay = (windowDay + 1) % 7;
                    if (windowDay == dayIndex && hour >= start) return true;
                    if (nextDay == dayIndex && hour < end) return true;
                }
            }
            return false;
        }

        private bool TryGetActiveWindow(out Window window, out DateTime end)
        {
            window = null;
            end = DateTime.Now;
            var now = DateTime.Now;
            int dayIndex = (int)now.DayOfWeek;
            double hour = now.Hour + now.Minute / 60.0;

            foreach (var w in config.RaidWindows)
            {
                if (w == null) continue;
                int windowDay = DayIndexOf(w.Day);
                if (windowDay < 0) continue;

                int start = Mathf.Clamp(w.StartHour, 0, 24);
                int endHour = Mathf.Clamp(w.EndHour, 0, 24);

                if (start < endHour)
                {
                    if (windowDay == dayIndex && hour >= start && hour < endHour)
                    {
                        window = w;
                        end = now.Date.AddHours(endHour);
                        return true;
                    }
                }
                else if (start > endHour)
                {
                    int nextDay = (windowDay + 1) % 7;
                    if (windowDay == dayIndex && hour >= start)
                    {
                        window = w;
                        end = now.Date.AddDays(1).AddHours(endHour);
                        return true;
                    }
                    if (nextDay == dayIndex && hour < endHour)
                    {
                        window = w;
                        end = now.Date.AddHours(endHour);
                        return true;
                    }
                }
            }
            return false;
        }

        private Window FindNextWindow(out DateTime startTime)
        {
            startTime = DateTime.MinValue;
            if (config.RaidWindows == null) return null;

            var now = DateTime.Now;
            Window best = null;
            DateTime bestStart = DateTime.MaxValue;

            foreach (var w in config.RaidWindows)
            {
                if (w == null) continue;
                int windowDay = DayIndexOf(w.Day);
                if (windowDay < 0) continue;

                int start = Mathf.Clamp(w.StartHour, 0, 24);
                int diff = (windowDay - (int)now.DayOfWeek + 7) % 7;
                var candidate = now.Date.AddDays(diff).AddHours(start);
                if (candidate <= now) candidate = candidate.AddDays(7);
                if (candidate < bestStart)
                {
                    bestStart = candidate;
                    best = w;
                }
            }

            startTime = bestStart;
            return best;
        }

        private string DescribeStatus(string userId)
        {
            Window active;
            DateTime end;
            if (TryGetActiveWindow(out active, out end))
                return Msg("RaidOpen", userId, end.Hour.ToString("00"));

            DateTime start;
            var next = FindNextWindow(out start);
            if (next == null)
                return Msg("NoWindows", userId);

            var span = start - DateTime.Now;
            string inText = span.TotalHours >= 1
                ? Msg("InHours", userId, (int)span.TotalHours, span.Minutes)
                : Msg("InMinutes", userId, Math.Max(1, span.Minutes));

            return Msg("RaidClosed", userId, next.Day, Mathf.Clamp(next.StartHour, 0, 24).ToString("00"),
                Mathf.Clamp(next.EndHour, 0, 24).ToString("00"), inText);
        }

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

        [ConsoleCommand("pveraidhours.status")]
        private void CcmdStatus(ConsoleSystem.Arg arg)
        {
            if (arg == null) return;
            var player = arg.Player();
            if (player != null && !permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                arg.ReplyWith(Msg("NoPermission", player.UserIDString));
                return;
            }
            if (player == null && !arg.IsAdmin)
            {
                arg.ReplyWith(Msg("NoPermission"));
                return;
            }
            arg.ReplyWith(DescribeStatus(player?.UserIDString));
        }
    }
}