OnLivestockAnimalFamiliarityAdd

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

namespace Oxide.Plugins
{
    [Info("Familiarity Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks or caps livestock familiarity gains for players who do not own the animal")]
    public class FamiliarityGuard : RustPlugin
    {
        private const string PermBypass = "familiarityguard.bypass";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Allow same team members")]
            public bool AllowTeam { get; set; } = false;

            [JsonProperty("Maximum seconds credited per call (0 = unlimited)")]
            public float MaxSeconds { get; set; } = 0f;
        }

        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>
            {
                ["Blocked"] = "You cannot gain familiarity with an animal you do not own."
            }, this);
        }

        private string Msg(string key, string userId = null) => lang.GetMessage(key, this, userId);

        private void Init()
        {
            permission.RegisterPermission(PermBypass, this);
        }

        private object OnLivestockAnimalFamiliarityAdd(Rust.Ai.Gen2.LivestockAnimal livestockAnimal, ulong userId, float seconds, Rust.Ai.Gen2.LivestockAnimal.FamiliarityReason reason)
        {
            if (livestockAnimal == null || userId == 0 || seconds <= 0f) return null;

            var player = BasePlayer.FindByID(userId);
            if (player == null) return null;

            if (permission.UserHasPermission(player.UserIDString, PermBypass)) return null;

            var ownerId = livestockAnimal.OwnerID;
            if (ownerId != 0 && ownerId != userId)
            {
                if (config.AllowTeam && player.currentTeam != 0)
                {
                    var owner = BasePlayer.FindByID(ownerId);
                    if (owner != null && owner.currentTeam != 0 && owner.currentTeam == player.currentTeam) return null;
                }

                player.ChatMessage(Msg("Blocked", player.UserIDString));
                return true;
            }

            if (config.MaxSeconds > 0f && seconds > config.MaxSeconds)
            {
                return true;
            }

            return null;
        }
    }
}