OnPlayerKicked

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

namespace Oxide.Plugins
{
    [Info("Kick Audit Log", "RustPluginGenerator", "1.0.0")]
    [Description("Records every player kick (admin, plugin and EAC) into a rolling data file.")]
    public class KickAuditLog : RustPlugin
    {
        private const string PermView = "kickauditlog.view";
        private const string DataFile = "KickAuditLog";

        private PluginConfig config;
        private List<Entry> entries;

        private class PluginConfig
        {
            [JsonProperty("Maximum stored entries")]
            public int MaxEntries = 200;
        }

        private class Entry
        {
            [JsonProperty("Username")]
            public string Name;

            [JsonProperty("User ID")]
            public string UserId;

            [JsonProperty("Reason")]
            public string Reason;

            [JsonProperty("Reserved slot")]
            public bool ReserveSlot;

            [JsonProperty("UTC time")]
            public string Utc;
        }

        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>
            {
                ["NoAccess"] = "You do not have permission to use this command.",
                ["NoEntries"] = "No kicks have been recorded yet.",
                ["Header"] = "Last {0} kicks:",
                ["Line"] = "{0} ({1}) - {2} [{3}]"
            }, 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(PermView, this);
            entries = Interface.Oxide.DataFileSystem.ReadObject<List<Entry>>(DataFile) ?? new List<Entry>();
        }

        private void OnPlayerKicked(BasePlayer player, string reason, bool reserveSlot)
        {
            if (player == null) return;
            Record(player.displayName, player.UserIDString, reason, reserveSlot);
        }

        private void OnPlayerKicked(Network.Connection connection, string reason)
        {
            if (connection == null) return;
            Record(connection.username ?? "unknown", connection.userid.ToString(), reason, false);
        }

        private void Record(string name, string userId, string reason, bool reserveSlot)
        {
            if (entries == null) return;

            entries.Add(new Entry
            {
                Name = name,
                UserId = userId,
                Reason = reason ?? string.Empty,
                ReserveSlot = reserveSlot,
                Utc = DateTime.UtcNow.ToString("u")
            });

            int cap = config?.MaxEntries > 0 ? config.MaxEntries : 200;
            while (entries.Count > cap) entries.RemoveAt(0);

            Interface.Oxide.DataFileSystem.WriteObject(DataFile, entries);
        }

        [ChatCommand("kicklog")]
        private void CmdKickLog(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermView))
            {
                player.ChatMessage(Msg("NoAccess", player.UserIDString));
                return;
            }

            if (entries == null || entries.Count == 0)
            {
                player.ChatMessage(Msg("NoEntries", player.UserIDString));
                return;
            }

            player.ChatMessage(Msg("Header", player.UserIDString, entries.Count));
            int start = Mathf.Max(0, entries.Count - 10);
            for (int i = start; i < entries.Count; i++)
            {
                Entry e = entries[i];
                player.ChatMessage(Msg("Line", player.UserIDString, e.Name, e.UserId, e.Reason, e.Utc));
            }
        }

        private void Unload()
        {
            Interface.Oxide.DataFileSystem.WriteObject(DataFile, entries);
            entries = null;
        }
    }
}