How to make a Rust auto smelt on gather plugin (ore to fragments)

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

namespace Oxide.Plugins
{
    [Info("Auto Smelt Gather", "RustPluginGenerator", "1.0.0")]
    [Description("Converts gathered ore into smelted resources for players with a permission.")]
    public class AutoSmeltGather : RustPlugin
    {
        private const string PermUse = "autosmeltgather.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Keep at least one item when a conversion rounds down to zero")]
            public bool KeepMinimum { get; set; } = true;

            [JsonProperty("Conversions (gathered shortname -> output shortname and ratio)")]
            public Dictionary<string, Conversion> Conversions { get; set; } = new Dictionary<string, Conversion>
            {
                ["metal.ore"] = new Conversion("metal.fragments", 1f, true),
                ["hq.metal.ore"] = new Conversion("metal.refined", 1f, true),
                ["sulfur.ore"] = new Conversion("sulfur", 1f, true),
                ["wood"] = new Conversion("charcoal", 0.5f, false)
            };
        }

        private class Conversion
        {
            [JsonProperty("Output shortname")]
            public string Output { get; set; }

            [JsonProperty("Ratio")]
            public float Ratio { get; set; }

            [JsonProperty("Enabled")]
            public bool Enabled { get; set; }

            public Conversion()
            {
            }

            public Conversion(string output, float ratio, bool enabled)
            {
                Output = output;
                Ratio = ratio;
                Enabled = enabled;
            }
        }

        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>
            {
                ["Smelt.Active"] = "Auto smelting is active for you. Converted resources: {0}",
                ["Smelt.Inactive"] = "Auto smelting is not enabled for you. Ask an admin about the autosmeltgather.use permission.",
                ["Smelt.None"] = "Auto smelting is active but no resource conversions are currently enabled."
            }, 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(PermUse, this);
        }

        private object OnDispenserGather(ResourceDispenser resourceDispenser, BasePlayer entity, Item item)
        {
            if (entity == null || entity.IsNpc || entity.UserIDString == null) return null;
            if (!permission.UserHasPermission(entity.UserIDString, PermUse)) return null;

            Convert(item);
            return null;
        }

        private object OnDispenserBonus(ResourceDispenser resourceDispenser, BasePlayer player, Item item)
        {
            if (player == null || player.IsNpc || player.UserIDString == null) return null;
            if (!permission.UserHasPermission(player.UserIDString, PermUse)) return null;

            Convert(item);
            return null;
        }

        private void Convert(Item item)
        {
            if (item?.info == null || item.amount <= 0) return;

            Conversion conversion;
            if (!config.Conversions.TryGetValue(item.info.shortname, out conversion)) return;
            if (conversion == null || !conversion.Enabled || conversion.Ratio <= 0f) return;

            var outputDef = ItemManager.FindItemDefinition(conversion.Output);
            if (outputDef == null) return;

            int amount = Mathf.FloorToInt(item.amount * conversion.Ratio);
            if (amount <= 0)
            {
                if (!config.KeepMinimum) return;
                amount = 1;
            }

            item.info = outputDef;
            item.amount = amount;
            item.MarkDirty();
        }

        [ChatCommand("smelt")]
        private void CmdSmelt(BasePlayer player, string command, string[] args)
        {
            if (player == null || string.IsNullOrEmpty(player.UserIDString)) return;

            if (!permission.UserHasPermission(player.UserIDString, PermUse))
            {
                player.ChatMessage(Msg("Smelt.Inactive", player.UserIDString));
                return;
            }

            var active = new List<string>();
            foreach (var pair in config.Conversions)
            {
                if (pair.Value == null || !pair.Value.Enabled || pair.Value.Ratio <= 0f) continue;
                active.Add(string.Format("{0} -> {1} (x{2:0.##})", pair.Key, pair.Value.Output, pair.Value.Ratio));
            }

            if (active.Count == 0)
            {
                player.ChatMessage(Msg("Smelt.None", player.UserIDString));
                return;
            }

            player.ChatMessage(Msg("Smelt.Active", player.UserIDString, string.Join(", ", active.ToArray())));
        }
    }
}