def load(model, *args, **kwargs):
    importer = registry[model.__name__](model=model)
    return importer.load(*args, **kwargs)

class Importer(object):
    def __init__(self, model):
        self.model = model

    def load(self, cleaned_data, raw_data, import_hooks):
        mbid = cleaned_data.pop('mbid')
        m = self.model.objects.update_or_create(mbid=mbid, defaults=cleaned_data)[0]
        for hook in import_hooks:
            hook(m, cleaned_data, raw_data)
        return m

class Mapping(object):
    """Cast musicbrainz data to funkwhale data and vice-versa"""
    def __init__(self, musicbrainz_mapping):
        self.musicbrainz_mapping = musicbrainz_mapping

        self._from_musicbrainz = {}
        self._to_musicbrainz = {}
        for field_name, conf in self.musicbrainz_mapping.items():
            self._from_musicbrainz[conf['musicbrainz_field_name']] = {
                'field_name': field_name,
                'converter': conf.get('converter', lambda v: v)
            }
            self._to_musicbrainz[field_name] = {
                'field_name': conf['musicbrainz_field_name'],
                'converter': conf.get('converter', lambda v: v)
            }
    def from_musicbrainz(self, key, value):
        return self._from_musicbrainz[key]['field_name'], self._from_musicbrainz[key]['converter'](value)

registry = {
    'Artist': Importer,
    'Track': Importer,
    'Album': Importer,
    'Work': Importer,
}