How to make a Rust gather statistics plugin (wipe totals)

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

namespace Oxide.Plugins
{
    [Info("Gather Stats", "RustPluginGenerator", "1.0.0")]
    [Description("Tracks wood, stone, metal ore, sulfur ore and cloth gathered per player for the current wipe.")]
    public class GatherStats : RustPlugin
    {
        private const string PermViewOthers = "gatherstats.viewothers";

        private PluginConfig config;
        private Dictionary<string, Dictionary<string, double>> totals = new Dictionary<string, Dictionary<string, double>>();
        private Timer saveTimer;

        private class PluginConfig
        {
            [JsonProperty("Tracked shortnames")]
            public List<string> TrackedShortnames = new List<string>
            {
                "wood", "stones", "metal.ore", "sulfur.ore", "cloth"
            };

            [JsonProperty("Save Interval Seconds")]
            public float SaveInterval = 120f;
        }

        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>
            {
                ["Header"] = "Gathered this wipe ({0}):",
                ["Line"] = "{0}: {1}",
                ["NoData"] = "{0} has not gathered any tracked resources this wipe.",
                ["Self"] = "You",
                ["NoPermission"] = "You do not have permission to view another player's totals.",
                ["NotFound"] = "Player not found."
            }, 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(PermViewOthers, this);
        }

        private void OnServerInitialized()
        {
            totals = Interface.Oxide.DataFileSystem.ReadObject<Dictionary<string, Dictionary<string, double>>>(Name)
                     ?? new Dictionary<string, Dictionary<string, double>>();

            saveTimer?.Destroy();
            saveTimer = timer.Every(Mathf.Max(10f, config.SaveInterval), SaveData);
        }

        private void Unload()
        {
            saveTimer?.Destroy();
            saveTimer = null;
            SaveData();
        }

        private void SaveData()
        {
            Interface.Oxide.DataFileSystem.WriteObject(Name, totals);
        }

        private bool IsTracked(string shortname)
        {
            return shortname != null && config.TrackedShortnames.Contains(shortname);
        }

        private void AddGathered(BasePlayer player, string shortname, double amount)
        {
            if (player == null || amount <= 0 || !IsTracked(shortname)) return;

            Dictionary<string, double> playerTotals;
            if (!totals.TryGetValue(player.UserIDString, out playerTotals))
            {
                playerTotals = new Dictionary<string, double>();
                totals[player.UserIDString] = playerTotals;
            }

            double current;
            playerTotals.TryGetValue(shortname, out current);
            playerTotals[shortname] = current + amount;
        }

        private void OnDispenserGathered(ResourceDispenser resourceDispenser, BasePlayer entity, Item item)
        {
            if (item?.info == null || entity == null) return;
            AddGathered(entity, item.info.shortname, item.amount);
        }

        private object OnCollectiblePickup(CollectibleEntity collectibleEntity, BasePlayer reciever, bool eat)
        {
            if (collectibleEntity?.itemList == null || reciever == null) return null;

            foreach (ItemAmount itemAmount in collectibleEntity.itemList)
            {
                if (itemAmount?.itemDef == null) continue;
                if (!IsTracked(itemAmount.itemDef.shortname)) continue;

                AddGathered(reciever, itemAmount.itemDef.shortname, itemAmount.amount);
            }

            return null;
        }

        private void OnNewSave(string strFilename)
        {
            totals.Clear();
            SaveData();
            PrintWarning("New save detected, gather statistics were reset.");
        }

        [ChatCommand("gathered")]
        private void CmdGathered(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;

            if (args == null || args.Length == 0)
            {
                ShowTotals(player, player.UserIDString, Msg("Self", player.UserIDString));
                return;
            }

            if (!permission.UserHasPermission(player.UserIDString, PermViewOthers))
            {
                SendReply(player, Msg("NoPermission", player.UserIDString));
                return;
            }

            BasePlayer target = BasePlayer.FindAwakeOrSleeping(args[0]);
            if (target == null)
            {
                SendReply(player, Msg("NotFound", player.UserIDString));
                return;
            }

            ShowTotals(player, target.UserIDString, target.displayName);
        }

        private void ShowTotals(BasePlayer viewer, string targetId, string displayName)
        {
            Dictionary<string, double> playerTotals;
            if (!totals.TryGetValue(targetId, out playerTotals) || playerTotals.Count == 0)
            {
                SendReply(viewer, Msg("NoData", viewer.UserIDString, displayName));
                return;
            }

            SendReply(viewer, Msg("Header", viewer.UserIDString, displayName));

            foreach (string shortname in config.TrackedShortnames)
            {
                double amount;
                if (!playerTotals.TryGetValue(shortname, out amount) || amount <= 0) continue;

                ItemDefinition def = ItemManager.FindItemDefinition(shortname);
                string label = def != null ? def.displayName.english : shortname;
                SendReply(viewer, Msg("Line", viewer.UserIDString, label, ((long)amount).ToString("N0")));
            }
        }
    }
}