"""Artists logic."""
import logging

from models import ows_artist
from utils import document as document_utils
import util # noqa


def prepare_doc(event):
    """Construct a Cloudsearch document for the artist_info corpus.

    Args:
        event (dict): event with artist data from Maxwell's

    Returns:
        dict: cloudsearch document ready for upload

    """
    json_doc = {}
    doc_type = 'add'
    event_type = event.get('type')
    if not event_type or event.get('_metadata'):
        logging.warning(
            'An event with incompatible format received: %s',
            event)
        return json_doc

    if event_type == 'delete':
        doc_type = 'delete'

    if doc_type == 'add':
        json_doc = ows_artist.get_artist_document(
            event['data']['artist_id'])

    return document_utils.prepare_for_upload(
        util.parse_spec_file('artists'),
        {
            'type': doc_type,
            'id': 'art{}'.format(event['data']['artist_id']),
            'fields': json_doc})