#!/usr/bin/env python3
# Copyright European Organization for Nuclear Research (CERN) since 2012
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Abacus rse is a daemon to update rse counters.
"""

import argparse
import signal

from rucio.daemons.abacus.rse import run, stop


def get_parser():
    """
    Returns the argparse parser.
    """
    description = (
        "The Abacus-RSE daemon is responsible for updating RSE usages. "
        "It checks if there are new entries in the UpdatedRSECounter table "
        "and updates the RSE counter in the RSECounter table "
        "by adding or subtracting the amount of files and the size."
    )

    parser = argparse.ArgumentParser(description=description, epilog='''
Upload a file to your RSE::

  $ rucio upload --rse MOCK --scope mock filename.txt

Check RSE usage::

  $ rucio list-rse-usage MOCK
  USAGE:
  ------
     files: 0
     used: 0.000 B
     rse: MOCK
     updated_at: 2018-11-30 14:28:34
     source: rucio
  ------

Run the daemon::

  $ rucio-abacus-rse --run-once

Check RSE usage again::

  $ rucio list-rse-usage MOCK
  USAGE:
  ------
      files: 1
      used: 213.481 kB
      rse: MOCK
      updated_at: 2018-12-03 08:58:33
      source: rucio
  ------
''', formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument("--run-once", action="store_true", default=False, help='One iteration only')
    parser.add_argument("--threads", action="store", default=1, type=int, help='Concurrency control: total number of threads on this process')
    parser.add_argument("--enable-history", action="store_true", default=False, help='Record RSE usage into history table every hour.')
    parser.add_argument('--sleep-time', action="store", default=10, type=int, help='Concurrency control: thread sleep time after each chunk of work')
    return parser


if __name__ == "__main__":

    signal.signal(signal.SIGTERM, stop)
    parser = get_parser()
    args = parser.parse_args()
    try:
        run(once=args.run_once, threads=args.threads, fill_history_table=args.enable_history, sleep_time=args.sleep_time)
    except KeyboardInterrupt:
        stop()
