FREE LimitTrainLength : 1.0.0 1.0.0

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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Oxide.Plugins
{
    [Info("Limit Train Length", "WhiteThunder", "1.0.0")]
    [Description("Limits the max length of trains.")]
    internal class LimitTrainLength : CovalencePlugin
    {
        #region Fields

        private Configuration _config;
        private readonly object False = false;

        #endregion

        #region Hooks

        private void Init()
        {
            if (_config.TrainLengthLimit < 0)
            {
                Unsubscribe(nameof(CanTrainCarCouple));
            }
        }

        private object CanTrainCarCouple(TrainCar trainCar, TrainCar otherTrainCar)
        {
            if (trainCar.completeTrain.NumTrainCars + otherTrainCar.completeTrain.NumTrainCars <= _config.TrainLengthLimit)
                return null;

            return False;
        }

        #endregion

        #region Configuration

        [JsonObject(MemberSerialization.OptIn)]
        private class Configuration : BaseConfiguration
        {
            [JsonProperty("Train length limit")]
            public int TrainLengthLimit = -1;
        }

        private Configuration GetDefaultConfig() => new Configuration();

        #region Configuration Helpers

        [JsonObject(MemberSerialization.OptIn)]
        private class BaseConfiguration
        {
            private string ToJson() => JsonConvert.SerializeObject(this);

            public Dictionary<string, object> ToDictionary() => JsonHelper.Deserialize(ToJson()) as Dictionary<string, object>;
        }

        private static class JsonHelper
        {
            public static object Deserialize(string json) => ToObject(JToken.Parse(json));

            private static object ToObject(JToken token)
            {
                switch (token.Type)
                {
                    case JTokenType.Object:
                        return token.Children<JProperty>().ToDictionary(prop => prop.Name,
                                                  prop => ToObject(prop.Value));

                    case JTokenType.Array:
                        return token.Select(ToObject).ToList();

                    default:
                        return ((JValue)token).Value;
                }
            }
        }

        private bool MaybeUpdateConfig(BaseConfiguration config)
        {
            var currentWithDefaults = config.ToDictionary();
            var currentRaw = Config.ToDictionary(x => x.Key, x => x.Value);
            return MaybeUpdateConfigSection(currentWithDefaults, currentRaw);
        }

        private bool MaybeUpdateConfigSection(Dictionary<string, object> currentWithDefaults, Dictionary<string, object> currentRaw)
        {
            var changed = false;

            foreach (var key in currentWithDefaults.Keys)
            {
                object currentRawValue;
                if (currentRaw.TryGetValue(key, out currentRawValue))
                {
                    var defaultDictValue = currentWithDefaults[key] as Dictionary<string, object>;
                    var currentDictValue = currentRawValue as Dictionary<string, object>;

                    if (defaultDictValue != null)
                    {
                        if (currentDictValue == null)
                        {
                            currentRaw[key] = currentWithDefaults[key];
                            changed = true;
                        }
                        else if (MaybeUpdateConfigSection(defaultDictValue, currentDictValue))
                            changed = true;
                    }
                }
                else
                {
                    currentRaw[key] = currentWithDefaults[key];
                    changed = true;
                }
            }

            return changed;
        }

        protected override void LoadDefaultConfig() => _config = GetDefaultConfig();

        protected override void LoadConfig()
        {
            base.LoadConfig();
            try
            {
                _config = Config.ReadObject<Configuration>();
                if (_config == null)
                {
                    throw new JsonException();
                }

                if (MaybeUpdateConfig(_config))
                {
                    PrintWarning("Configuration appears to be outdated; updating and saving");
                    SaveConfig();
                }
            }
            catch (Exception e)
            {
                PrintError(e.Message);
                PrintWarning($"Configuration file {Name}.json is invalid; using defaults");
                LoadDefaultConfig();
            }
        }

        protected override void SaveConfig()
        {
            Puts($"Configuration changes saved to {Name}.json");
            Config.WriteObject(_config, true);
        }

        #endregion

        #endregion
    }
}