OnTerrainCreate

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

namespace Oxide.Plugins
{
    [Info("Terrain Create Reporter", "RustPluginGenerator", "1.0.0")]
    [Description("Records terrain generation start and reports a summary after the server is initialised")]
    public class TerrainCreateReporter : RustPlugin
    {
        private const string PermNotify = "terraincreatereporter.notify";

        private PluginConfig config;
        private bool terrainCreateSeen;
        private string recordedAt = "unknown";
        private uint recordedSeed;
        private int recordedWorldSize;

        private class PluginConfig
        {
            [JsonProperty("Announce terrain summary on startup")]
            public bool AnnounceOnStartup { get; set; } = true;
        }

        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>
            {
                ["Summary"] = "Terrain build recorded at {0} UTC. World seed {1}, size {2}.",
                ["NotSeen"] = "No terrain creation event was observed this boot."
            }, 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(PermNotify, this);
        }

        private void OnTerrainCreate(TerrainGenerator terrainGenerator)
        {
            if (terrainGenerator == null) return;

            terrainCreateSeen = true;
            recordedAt = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss");

            recordedSeed = (uint)ConVar.Server.seed;
            recordedWorldSize = Mathf.RoundToInt(World.Size);
        }

        private void OnServerInitialized()
        {
            if (!config.AnnounceOnStartup) return;

            string message = terrainCreateSeen
                ? Msg("Summary", null, recordedAt, recordedSeed, recordedWorldSize)
                : Msg("NotSeen", null);

            foreach (var player in BasePlayer.activePlayerList)
            {
                if (player == null || !player.IsConnected) continue;
                if (!permission.UserHasPermission(player.UserIDString, PermNotify)) continue;
                player.ChatMessage(message);
            }
        }
    }
}