using System.Threading.Tasks;

using JSONAPI.Documents;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

namespace JSONAPI.Json

{

/// <summary>

/// Default implementation of IMetadataFormatter

/// </summary>

public class MetadataFormatter : IMetadataFormatter

{

public Task Serialize(IMetadata metadata, JsonWriter writer)

{

if (metadata == null)

{

writer.WriteNull();

}

else

{

if (metadata.MetaObject == null)

throw new JsonSerializationException("The meta object cannot be null.");

metadata.MetaObject.WriteTo(writer);

}

return Task.FromResult(0);

}

public Task<IMetadata> Deserialize(JsonReader reader, string currentPath)

{

IMetadata metadata;

if (reader.TokenType == JsonToken.Null)

{

metadata = null;

}

else if (reader.TokenType == JsonToken.StartObject)

{

var obj = (JObject)JToken.ReadFrom(reader);

metadata = new BasicMetadata(obj);

}

else

{

throw new DeserializationException("", "Expected an object or null for `meta`, but got " + reader.TokenType, currentPath);

}

return Task.FromResult(metadata);

}

}

}