OnPlayerBoatCollide

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

namespace Oxide.Plugins
{
    [Info("Boat Collision Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Prevents boats from destroying selected objects and warns the driver on hard impacts")]
    public class BoatCollisionGuard : RustPlugin
    {
        private const string PermBypass = "boatcollisionguard.bypass";

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

        private class PluginConfig
        {
            [JsonProperty("Protected prefabs")]
            public List<string> ProtectedPrefabs = new List<string> { "foundation", "wall", "building", "deployable" };

            [JsonProperty("Minimum impact speed")]
            public float MinimumImpactSpeed = 3f;

            [JsonProperty("Warning cooldown seconds")]
            public float WarningCooldown = 10f;
        }

        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"] = "Your boat hit {0} and it was protected from destruction.",
                ["TooFast"] = "Careful, {0} cannot take many more hits like that."
            }, this);
        }

        private string Msg(string key, string userId = null, params object[] args)
        {
            return string.Format(lang.GetMessage(key, this, userId), args);
        }

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

        private object OnPlayerBoatCollide(PlayerBoat playerBoat, BaseEntity entity, Collision collision)
        {
            if (playerBoat == null || entity == null || entity.IsDestroyed) return null;

            float speed = collision == null ? 0f : collision.relativeVelocity.magnitude;
            if (speed < config.MinimumImpactSpeed) return null;

            if (!IsProtected(entity)) return null;

            BasePlayer driver = playerBoat.GetDriver();
            if (driver != null && !permission.UserHasPermission(driver.UserIDString, PermBypass))
            {
                NotifyDriver(driver, entity);
            }

            return false;
        }

        private bool IsProtected(BaseEntity entity)
        {
            if (entity is BuildingBlock || entity is Door || entity is LootableCorpse || entity is BasePlayer) return true;
            string prefab = entity.ShortPrefabName;
            if (string.IsNullOrEmpty(prefab)) return false;
            foreach (string entry in config.ProtectedPrefabs)
            {
                if (prefab.IndexOf(entry, StringComparison.OrdinalIgnoreCase) >= 0) return true;
            }
            return false;
        }

        private void NotifyDriver(BasePlayer driver, BaseEntity entity)
        {
            float now = UnityEngine.Time.realtimeSinceStartup;
            float previous;
            if (lastWarn.TryGetValue(driver.userID, out previous) && now - previous < config.WarningCooldown) return;
            lastWarn[driver.userID] = now;

            string name = entity.ShortPrefabName ?? "an object";
            driver.ChatMessage(Msg("Blocked", driver.UserIDString, name));
        }

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