using Newtonsoft.Json;

namespace DS.Module.Core;

public class JsonConverterLong : JsonConverter
{
    /// <summary>
    /// 是否可以转换
    /// </summary>
    /// <param name="objectType"></param>
    /// <returns></returns>
    public override bool CanConvert(Type objectType)
    {
        return true;
    }

    /// <summary>
    /// 读json
    /// </summary>
    /// <param name="reader"></param>
    /// <param name="objectType"></param>
    /// <param name="existingValue"></param>
    /// <param name="serializer"></param>
    /// <returns></returns>
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if ((reader.ValueType == null || reader.ValueType == typeof(long?)) && reader.Value == null)
        {
            return null;
        }
        else
        {
            long.TryParse(reader.Value != null ? reader.Value.ToString() : "", out long value);
            return value;
        }
    }

    /// <summary>
    /// 写json
    /// </summary>
    /// <param name="writer"></param>
    /// <param name="value"></param>
    /// <param name="serializer"></param>
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        if (value == null)
            writer.WriteValue(value);
        else if ((Int64)value == 0)
        {
            writer.WriteValue("");
        }
        else
            writer.WriteValue(value + "");
    }
}