using System;
using ICD.Common.Properties;
using Newtonsoft.Json;

namespace ICD.Common.Utils.Json
{
	public abstract class AbstractGenericJsonConverter<T> : JsonConverter
	{
		/// <summary>
		/// Writes the JSON representation of the object.
		/// </summary>
		/// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter"/> to write to.</param>
		/// <param name="value">The value.</param>
		/// <param name="serializer">The calling serializer.</param>
		public override sealed void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
		{
			if (value == null)
			{
				writer.WriteNull();
				return;
			}

			WriteJson(writer, (T)value, serializer);
		}

		/// <summary>
		/// Writes the JSON representation of the object.
		/// </summary>
		/// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter"/> to write to.</param>
		/// <param name="value">The value.</param>
		/// <param name="serializer">The calling serializer.</param>
		[PublicAPI]
		public abstract void WriteJson(JsonWriter writer, T value, JsonSerializer serializer);

		/// <summary>
		/// Reads the JSON representation of the object.
		/// </summary>
		/// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader"/> to read from.</param>
		/// <param name="objectType">Type of the object.</param>
		/// <param name="existingValue">The existing value of object being read.</param>
		/// <param name="serializer">The calling serializer.</param>
		/// <returns>
		/// The object value.
		/// </returns>
		public override sealed object ReadJson(JsonReader reader, Type objectType, object existingValue,
		                                       JsonSerializer serializer)
		{
			if (reader.TokenType == JsonToken.Null)
				return null;

			return ReadJson(reader, (T)existingValue, serializer);
		}

		/// <summary>
		/// Reads the JSON representation of the object.
		/// </summary>
		/// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader"/> to read from.</param>
		/// <param name="existingValue">The existing value of object being read.</param>
		/// <param name="serializer">The calling serializer.</param>
		/// <returns>
		/// The object value.
		/// </returns>
		[PublicAPI]
		public abstract T ReadJson(JsonReader reader, T existingValue, JsonSerializer serializer);

		/// <summary>
		/// Determines whether this instance can convert the specified object type.
		/// </summary>
		/// <param name="objectType">Type of the object.</param>
		/// <returns>
		/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
		/// </returns>
		public override bool CanConvert(Type objectType)
		{
			return objectType == typeof(T);
		}
	}
}