How to make a Rust headshot announcement plugin (bonus item on headshot kill)

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

namespace Oxide.Plugins
{
    [Info("Headshot Rewards", "RustPluginGenerator", "1.0.0")]
    [Description("Announces headshot kills in chat and grants a bonus item past a minimum distance")]
    public class HeadshotRewards : RustPlugin
    {
        private const string PermAnnounce = "headshotrewards.announce";
        private const string PermReward = "headshotrewards.reward";
        private const string PermAdmin = "headshotrewards.admin";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Announce headshots")]
            public bool Announce { get; set; } = true;

            [JsonProperty("Give bonus item")]
            public bool GiveReward { get; set; } = true;

            [JsonProperty("Minimum distance")]
            public float MinimumDistance { get; set; } = 25f;

            [JsonProperty("Skip team kills")]
            public bool SkipTeamKills { get; set; } = true;

            [JsonProperty("Bonus shortname")]
            public string BonusShortname { get; set; } = "scrap";

            [JsonProperty("Bonus amount")]
            public int BonusAmount { get; set; } = 50;

            [JsonProperty("Bonus skin")]
            public ulong BonusSkin { get; set; } = 0UL;
        }

        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>
            {
                ["Announce"] = "<color=#ff6b6b>HEADSHOT</color> {0} eliminated {1} with {2} from {3}m",
                ["Unknown"] = "unknown weapon",
                ["Reload"] = "Headshot Rewards reloaded. Minimum distance: {0}m, bonus: {1} x {2}"
            }, 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(PermAnnounce, this);
            permission.RegisterPermission(PermReward, this);
            permission.RegisterPermission(PermAdmin, this);
        }

        private void OnServerInitialized()
        {
            if (!config.GiveReward) return;
            if (ItemManager.FindItemDefinition(config.BonusShortname) == null)
                PrintWarning($"Bonus shortname '{config.BonusShortname}' does not exist; no item will be given");
        }

        private void OnEntityDeath(BaseCombatEntity entity, HitInfo info)
        {
            if (config == null || info == null) return;

            var victim = entity as BasePlayer;
            if (victim == null) return;

            var killer = info.InitiatorPlayer;
            if (killer == null || killer == victim) return;
            if (!info.isHeadshot) return;
            if (info.ProjectileDistance < config.MinimumDistance) return;

            bool canAnnounce = config.Announce && permission.UserHasPermission(killer.UserIDString, PermAnnounce);
            bool canReward = config.GiveReward && permission.UserHasPermission(killer.UserIDString, PermReward);
            if (!canAnnounce && !canReward) return;

            if (config.SkipTeamKills && killer.currentTeam != 0 && killer.currentTeam == victim.currentTeam) return;

            string weapon = "weapon";
            var item = info.Weapon != null ? info.Weapon.GetItem() : null;
            if (item != null && item.info != null)
                weapon = item.info.displayName.english;
            else
                weapon = Msg("Unknown");

            if (canAnnounce)
            {
                Server.Broadcast(Msg("Announce", null,
                    killer.displayName,
                    victim.displayName,
                    weapon,
                    Math.Round(info.ProjectileDistance, 1)));
            }

            if (canReward)
                GiveBonus(killer);
        }

        private void GiveBonus(BasePlayer player)
        {
            var item = ItemManager.CreateByName(config.BonusShortname, Math.Max(1, config.BonusAmount), config.BonusSkin);
            if (item == null) return;
            player.GiveItem(item);
        }

        [ChatCommand("hsreload")]
        private void CmdReload(BasePlayer player, string command, string[] args)
        {
            if (player != null && !permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                SendReply(player, "You do not have permission to use this command");
                return;
            }
            LoadConfig();
            SendReply(player, Msg("Reload", player?.UserIDString,
                config.MinimumDistance, config.BonusAmount, config.BonusShortname));
        }
    }
}