Add JsonConverters for Contentstack Modular Block Fields

namespace Root.Core.Models.Configuration
{
    using System;
    using System.Collections.Generic;
    using System.Reflection;
    using System.Diagnostics;

    using Newtonsoft.Json;

    using Deliverystack.Core.Attributes;
    using Deliverystack.Core.Configuration;

    using Root.Core.Models.Fields;

    public class SerializationConfigurator : IConfigureSerialization
    {
        private List<JsonConverter> _jsonConverters = null;

        public void ConfigureSerialization(JsonSerializerSettings settings)
        {
            if (_jsonConverters == null)
            {
                _jsonConverters = new List<JsonConverter>();

                foreach (Type type in AutoLoadJsonConverter.GetTypesWithAttribute(typeof(AutoLoadJsonConverter)))
                {
                    if (AutoLoadJsonConverter.IsEnabledForType(type))
                    {
                        _jsonConverters.Add((JsonConverter)Activator.CreateInstance(type));
                    }
                }

                foreach (Type blockType in ModularBlockBase.Implementations)
                {
                    //TODO: since they all inherit, this doesn't require reflection - just create them as the base class and call the method?

                    MethodInfo methodInfo = blockType.GetRuntimeMethod("GetJsonConverter", new Type[0]);
                    Trace.Assert(methodInfo != null, "GetJsonConverter() not found in " + blockType);
                    object obj = Activator.CreateInstance(blockType);
                    JsonConverter jsonConverter = methodInfo.Invoke(obj, new object[0]) as JsonConverter;
                    Trace.Assert(jsonConverter != null, "No JsonConverter for " + blockType);
                    _jsonConverters.Add(jsonConverter);
                }
            }

            foreach (JsonConverter jsonConverter in _jsonConverters)
            {
                settings.Converters.Add(jsonConverter);
            }
        }
    }
}