import logging
import time

import features

from app import app # This is required to initialize the database.
from data import model
from workers.worker import Worker
from util.log import logfile_path
from util.timedeltastring import convert_to_timedelta


logger = logging.getLogger(__name__)


POLL_PERIOD_SECONDS = 60 * 60 # 1 hour


class ExpiredAppSpecificTokenWorker(Worker):
  def __init__(self):
    super(ExpiredAppSpecificTokenWorker, self).__init__()

    expiration_window = app.config.get('EXPIRED_APP_SPECIFIC_TOKEN_GC', '1d')
    self.expiration_window = convert_to_timedelta(expiration_window)

    logger.debug('Found expiration window: %s', expiration_window)
    self.add_operation(self._gc_expired_tokens, POLL_PERIOD_SECONDS)

  def _gc_expired_tokens(self):
    """ Garbage collects any expired app specific tokens outside of the configured
        window. """
    logger.debug('Garbage collecting expired app specific tokens with window: %s',
                 self.expiration_window)
    model.appspecifictoken.gc_expired_tokens(self.expiration_window)
    return True

if __name__ == "__main__":
  logging.config.fileConfig(logfile_path(debug=False), disable_existing_loggers=False)

  if not features.APP_SPECIFIC_TOKENS:
    logger.debug('App specific tokens disabled; skipping')
    while True:
      time.sleep(100000)

  if app.config.get('EXPIRED_APP_SPECIFIC_TOKEN_GC') is None:
    logger.debug('GC of App specific tokens is disabled; skipping')
    while True:
      time.sleep(100000)

  logger.debug('Starting expired app specific token GC worker')
  worker = ExpiredAppSpecificTokenWorker()
  worker.start()