OnXmasStockingFill

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

namespace Oxide.Plugins
{
    [Info("Custom Stocking Loot", "RustPluginGenerator", "1.0.0")]
    [Description("Fills Christmas stockings with a configurable loot table instead of the default one.")]
    public class CustomStockingLoot : RustPlugin
    {
        private class LootEntry
        {
            [JsonProperty("Shortname")]
            public string Shortname = "scrap";

            [JsonProperty("Amount")]
            public int Amount = 25;
        }

        private class PluginConfig
        {
            [JsonProperty("Use custom loot table")]
            public bool Enabled = true;

            [JsonProperty("Loot entries")]
            public List<LootEntry> Loot = new List<LootEntry>
            {
                new LootEntry { Shortname = "scrap", Amount = 50 },
                new LootEntry { Shortname = "xmas.present.small", Amount = 1 },
                new LootEntry { Shortname = "xmas.present.medium", Amount = 1 }
            };
        }

        private PluginConfig config;

        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);

        private void OnServerInitialized()
        {
            if (!config.Enabled || config.Loot == null) return;

            foreach (var entry in config.Loot)
            {
                if (string.IsNullOrEmpty(entry.Shortname)) continue;
                var def = ItemManager.FindItemDefinition(entry.Shortname);
                if (def == null)
                {
                    PrintWarning($"Unknown item shortname in config: {entry.Shortname}");
                    continue;
                }
                if (entry.Amount > def.stackable)
                {
                    PrintWarning($"{entry.Shortname} amount {entry.Amount} exceeds stack size {def.stackable}");
                }
            }
        }

        private object OnXmasStockingFill(Stocking stocking)
        {
            if (!config.Enabled || stocking == null) return null;
            if (stocking.inventory == null) return null;

            var entries = config.Loot;
            if (entries == null || entries.Count == 0) return null;

            foreach (var entry in entries)
            {
                var def = ItemManager.FindItemDefinition(entry.Shortname);
                if (def == null) continue;

                int remaining = Mathf.Max(1, entry.Amount);
                while (remaining > 0)
                {
                    int amount = Mathf.Min(remaining, def.stackable);
                    var item = ItemManager.CreateByName(entry.Shortname, amount);
                    if (item == null) break;

                    if (!item.MoveToContainer(stocking.inventory))
                    {
                        item.Remove();
                        break;
                    }
                    remaining -= amount;
                }
            }

            stocking.inventory.MarkDirty();
            return true;
        }
    }
}