)

// errNotAcceptable indicates Accept negotiation has failed
type errNotAcceptable struct {
	accepted []string
}

// NewNotAcceptableError returns an error of NotAcceptable which contains specified string
func NewNotAcceptableError(accepted []string) error {
	return errNotAcceptable{accepted}
}

func (e errNotAcceptable) Error() string {

	mediaType, ok := NegotiateMediaTypeOptions(req.Header.Get("Accept"), ns.SupportedMediaTypes(), restrictions)
	if !ok {
		supported, _ := MediaTypesForSerializer(ns)
		return mediaType, runtime.SerializerInfo{}, NewNotAcceptableError(supported)
	}
	// TODO: move into resthandler
	info := mediaType.Accepted
	if (mediaType.Pretty || isPrettyPrint(req)) && info.PrettySerializer != nil {
		info.Serializer = info.PrettySerializer
	}