using System;

using System.IO;

using System.Web.Http;

using Newtonsoft.Json;

namespace JSONAPI.Json

{

internal class ErrorSerializer : IErrorSerializer

{

private class JsonApiError

{

[JsonProperty(PropertyName = "id")]

public string Id { get; set; }

[JsonProperty(PropertyName = "status")]

public string Status { get; set; }

[JsonProperty(PropertyName = "title")]

public string Title { get; set; }

[JsonProperty(PropertyName = "detail")]

public string Detail { get; set; }

[JsonProperty(PropertyName = "inner")]

public JsonApiError Inner { get; set; }

[JsonProperty(PropertyName = "stackTrace")]

public string StackTrace { get; set; }

public JsonApiError(HttpError error)

{

Title = error.ExceptionType ?? error.Message;

Status = "500";

Detail = error.ExceptionMessage ?? error.MessageDetail;

StackTrace = error.StackTrace;

if (error.InnerException != null)

Inner = new JsonApiError(error.InnerException);

}

}

private readonly IErrorIdProvider _errorIdProvider;

public ErrorSerializer()

: this(new GuidErrorIdProvider())

{

}

public ErrorSerializer(IErrorIdProvider errorIdProvider)

{

_errorIdProvider = errorIdProvider;

}

public bool CanSerialize(Type type)

{

return type == typeof (HttpError);

}

public void SerializeError(object error, Stream writeStream, JsonWriter writer, JsonSerializer serializer)

{

var httpError = error as HttpError;

if (httpError == null) throw new Exception("Unsupported error type.");

writer.WriteStartObject();

writer.WritePropertyName("errors");

var jsonApiError = new JsonApiError(httpError)

{

Id = _errorIdProvider.GenerateId(httpError)

};

serializer.Serialize(writer, new[] { jsonApiError });

writer.WriteEndObject();

}

}

}