"""Artist formatting logic."""

from content_utils.exceptions import IneligibleEventError
from owsrequest import request

from src import config
from src import constants


def get_current_product_data(product_id):
    """Get current product artists."""
    ows_response = request.process(
        config.APPLICATION_NAME,
        config.ENVIRONMENT,
        'GET',
        constants.SERVICE_OWS_PRODUCT_DIGITAL,
        f'/product/audio/{product_id}'
    )
    if ows_response.status_code == 404:
        raise IneligibleEventError('Release not found.')
    if ows_response.status_code != 200:
        raise Exception('ows-product-digital service error.', ows_response.text)
    return ows_response.json()


def format_artists(product_id, release_correction_changes, artist_changes):
    """Format artists."""
    if not artist_changes:
        return
    current_product = get_current_product_data(product_id)
    role_list = _get_role_list_for_product(
        release_correction_changes,
        current_product['genre_id'],
        current_product['subgenre_id']
    )
    return _format_all_artists(artist_changes, current_product['product_artists'], role_list)


def _get_role_list_for_product(release_correction_changes, current_genre, current_subgenre):
    latest_genre = release_correction_changes.get(constants.FIELD_GENRE_ID, current_genre)
    latest_subgenre = release_correction_changes.get(
        'subgenre_id', current_subgenre)
    if latest_genre == constants.GENRE_ID_CLASSICAL:
        return constants.CLASSICAL_ARTISTS
    elif latest_subgenre in constants.SUBGENRE_WITH_COMPOSER_IDS:
        return constants.STANDARD_ARTISTS_AND_COMPOSER
    return constants.STANDARD_ARTISTS


def _format_all_artists(artist_changes, current_artists, role_list):
    result = []
    for role in role_list:
        if role in artist_changes:
            result.extend(artist_changes[role])
    for artist in current_artists:
        artist_role = artist['role'] if artist['role'] != 'primary_artist' else 'performer'
        if artist_role in role_list and artist_role not in artist_changes:
            result.append(artist)
    return result