from google.cloud import firestore
import logging

db = firestore.Client()

logger = logging.getLogger(__name__)


def get_user_query_stream(user):

    users = [i for i in db.collection(u'spotify_users').where(u'username', u'==', user).stream()]

    if len(users) > 0:
        return users
    else:
        logger.warning(f'{user} not found')
        return []


def get_user_doc_ref(user):

    users = get_user_query_stream(user)

    if len(users) > 0:
        if len(users) == 1:
            return users[0].reference

        else:
            logger.error(f"multiple {user}'s found")
            return None

    else:
        logger.error(f'{user} not found')
        return None


def get_user_playlists_collection(user_id):

    playlists = db.document(u'spotify_users/{}'.format(user_id)).collection(u'playlists')

    return playlists


def get_user_playlist_ref_by_username(user, playlist):

    user_ref = get_user_doc_ref(user)

    if user_ref:

        return get_user_playlist_ref_by_user_ref(user_ref, playlist)

    else:
        logger.error(f'{user} not found, looking up {playlist}')
        return None


def get_user_playlist_ref_by_user_ref(user_ref, playlist):

    playlist_collection = get_user_playlists_collection(user_ref.id)

    username = user_ref.get().to_dict()['username']

    if playlist_collection:
        query = [i for i in playlist_collection.where(u'name', u'==', playlist).stream()]

        if len(query) > 0:
            if len(query) == 1:
                if query[0].exists:
                    return query[0].reference

                else:
                    logger.error(f'{playlist} for {username} does not exist')
                    return query[0]

            else:
                logger.error(f'{username} multiple response playlists found for {playlist}')
                return query

        else:
            logger.error(f'{username} no playlist found for {playlist}')
            return None

    else:
        logger.error(f'{username} playlist collection not found, looking up {playlist}')
        return None