#!/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 account is a daemon to update account counters.
"""

import argparse
import signal

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


def get_parser():
    """
    Returns the argparse parser.
    """
    description = (
        "The Abacus-Account daemon is responsible for updating account usages. "
        "It checks if there are new entries in the UpdatedAccountCounter table "
        "and updates the account counters in the AccountCounter table by adding "
        "or subtracting the amount and size of files and recalculating the quotas."
    )

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

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

Check account usage::

  $ rucio list-account-usage username
  +-------+---------+---------+--------------+
  | RSE   | USAGE   | LIMIT   | QUOTA LEFT   |
  |-------+---------+---------+--------------|
  +-------+---------+---------+--------------+

Run the daemon::

  $ rucio-abacus-account --run-once

Check account usage again::

  $ rucio list-account-usage username
  +-------+------------+---------+--------------+
  | RSE   | USAGE      | LIMIT   | QUOTA LEFT   |
  |-------+------------+---------+--------------|
  | MOCK  | 211.724 kB | 0.000 B | 0.000 B      |
  +-------+------------+---------+--------------+

    ''', 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 account 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()
