import logging

from app import app
from data.database import (Repository, LogEntry, RepositoryActionCount, db_random_func, fn,
                           UseThenDisconnect)
from datetime import date, datetime, timedelta
from workers.worker import Worker

POLL_PERIOD_SECONDS = 10

logger = logging.getLogger(__name__)

def count_repository_actions():
  with UseThenDisconnect(app.config):
    try:
      # Get a random repository to count.
      today = date.today()
      yesterday = today - timedelta(days=1)
      has_yesterday_actions = (RepositoryActionCount.select(RepositoryActionCount.repository)
                                                    .where(RepositoryActionCount.date == yesterday))

      to_count = (Repository.select()
                            .where(~(Repository.id << (has_yesterday_actions)))
                            .order_by(db_random_func()).get())

      logger.debug('Counting: %s', to_count.id)

      actions = (LogEntry.select()
                         .where(LogEntry.repository == to_count,
                                LogEntry.datetime >= yesterday,
                                LogEntry.datetime < today)
                         .count())

      # Create the row.
      try:
        RepositoryActionCount.create(repository=to_count, date=yesterday, count=actions)
      except:
        logger.exception('Exception when writing count')
    except Repository.DoesNotExist:
      logger.debug('No further repositories to count')


class RepositoryActionCountWorker(Worker):
  def __init__(self):
    super(RepositoryActionCountWorker, self).__init__()
    self.add_operation(self._count_repository_actions, POLL_PERIOD_SECONDS)

  def _count_repository_actions(self):
    """ Counts actions for a random repository for the previous day. """
    count_repository_actions()

if __name__ == "__main__":
  worker = RepositoryActionCountWorker()
  worker.start()