/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2021 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: JsonNullableEnumConverter.cs                                    *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Server.Json.Converters
{
    class JsonNullableEnumConverter<T> : JsonConverter<T?> where T : struct, Enum
    {
        private readonly JsonConverter<T> _converter;

        public JsonNullableEnumConverter(JsonConverter<T> converter) => _converter = converter;

        public override T? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.Null)
            {
                reader.Read();
                return null;
            }

            return _converter.Read(ref reader, typeof(T), options);
        }

        public override void Write(Utf8JsonWriter writer, T? value, JsonSerializerOptions options)
        {
            if (value == null)
            {
                writer.WriteNullValue();
            }
            else
            {
                _converter.Write(writer, value.Value, options);
            }
        }
    }
}