using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace Essgee.Utilities
{
	public class InterfaceDictionaryConverter<TInterface> : JsonConverter
	{
		public override bool CanConvert(Type objectType)
		{
			return (objectType == typeof(TInterface));
		}

		public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
		{
			if (!objectType.IsGenericType || objectType.GetGenericTypeDefinition() != typeof(Dictionary<,>)) throw new InvalidOperationException("Can only deserialize dictionaries");

			var dictionary = (System.Collections.IDictionary)Activator.CreateInstance(objectType);
			//不再读取配置
			var jObject = JObject.Load(reader);
			foreach (var child in jObject.Children())
			{
				Type type = Assembly.GetExecutingAssembly().GetTypes().FirstOrDefault(y => typeof(TInterface).IsAssignableFrom(y) && !y.IsInterface && !y.IsAbstract && y.Name == child.Path);
				if (type != null)
					dictionary.Add(child.Path, JsonConvert.DeserializeObject(child.First.ToString(), type));
			}

			return dictionary;
		}

		public override bool CanWrite
		{
			get { return false; }
		}

		public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
		{
			throw new NotImplementedException();
		}
	}
}