OnEngineStatsRefreshed

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

namespace Oxide.Plugins
{
    [Info("Engine Performance Reward", "RustPluginGenerator", "1.0.0")]
    [Description("Gives a reward when a modular car engine reaches a configured overall performance fraction")]
    public class EnginePerformanceReward : RustPlugin
    {
        private const string PermReward = "engineperformancereward.reward";

        private class PluginConfig
        {
            [JsonProperty("Minimum overall performance (0-1)")]
            public float MinimumPerformance = 0.8f;

            [JsonProperty("Reward item shortname")]
            public string RewardItem = "scrap";

            [JsonProperty("Reward amount")]
            public int RewardAmount = 25;

            [JsonProperty("Cooldown seconds per engine")]
            public float CooldownSeconds = 300f;
        }

        private PluginConfig config;
        private readonly Dictionary<ulong, float> lastRewardAt = new Dictionary<ulong, float>();

        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>
            {
                ["Reward"] = "Your car engine reached {0:P0} overall performance. Reward: {1} x {2}",
                ["Cooldown"] = "This engine was already rewarded recently."
            }, 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(PermReward, this);
        }

        private void OnEngineStatsRefreshed(VehicleModuleEngine vehicleModuleEngine, Rust.Modular.EngineStorage engineStorage)
        {
            if (vehicleModuleEngine == null || engineStorage == null) return;
            if (vehicleModuleEngine.OverallPerformanceFraction < config.MinimumPerformance) return;

            var car = vehicleModuleEngine.GetParentEntity() as ModularCar;
            if (car == null) return;

            BasePlayer driver = null;
            // Find a mounted player who is driving the car
            foreach (var player in BasePlayer.activePlayerList)
            {
                if (player == null || !player.IsConnected) continue;
                var mounted = player.GetMounted();
                if (mounted == car && player.userID.IsSteamId())
                {
                    driver = player;
                    break;
                }
            }

            if (driver == null) return;
            if (!permission.UserHasPermission(driver.UserIDString, PermReward)) return;

            // Cooldown per engine module, not per player
            ulong moduleId = vehicleModuleEngine.net.ID.Value;
            float now = Time.realtimeSinceStartup;
            if (lastRewardAt.TryGetValue(moduleId, out float last) && now - last < config.CooldownSeconds)
            {
                driver.ChatMessage(Msg("Cooldown", driver.UserIDString));
                return;
            }
            lastRewardAt[moduleId] = now;

            var item = ItemManager.CreateByName(config.RewardItem, config.RewardAmount, 0UL);
            if (item == null) return;

            driver.GiveItem(item);
            driver.ChatMessage(Msg("Reward", driver.UserIDString, vehicleModuleEngine.OverallPerformanceFraction,
                config.RewardAmount, item.info.displayName.english));
        }

        private void Unload()
        {
            lastRewardAt.Clear();
        }
    }
}