"""
Script that updates data in a background process.
"""
import logging
import sys
from logging import getLogger, basicConfig
from pathlib import Path
from time import sleep

from mwmbl.crawler.urls import URLDatabase
from mwmbl.database import Database
from mwmbl.indexer import index_batches, historical
from mwmbl.indexer.batch_cache import BatchCache
from mwmbl.indexer.paths import BATCH_DIR_NAME, INDEX_NAME


basicConfig(stream=sys.stdout, level=logging.INFO)
logger = getLogger(__name__)


def run(data_path: str):
    logger.info("Started background process")

    with Database() as db:
        url_db = URLDatabase(db.connection)
        url_db.create_tables()

    historical.run()
    index_path = Path(data_path) / INDEX_NAME
    batch_cache = BatchCache(Path(data_path) / BATCH_DIR_NAME)

    while True:
        try:
            batch_cache.retrieve_batches(num_batches=10000)
        except Exception:
            logger.exception("Error retrieving batches")
        try:
            index_batches.run(batch_cache, index_path)
        except Exception:
            logger.exception("Error indexing batches")
        sleep(10)