# Copyright European Organization for Nuclear Research (CERN)
#
# 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-2.0OA
#
# Authors:
# - Vincent Garonne, <vincent.garonne@cern.ch>, 2012-2016
# - Mario Lassnig, <mario.lassnig@cern.ch>, 2013-2015
# - Cedric Serfon, <cedric.serfon@cern.ch>, 2013-2015
# - Wen Guan, <wen.guan@cern.ch>, 2014-2016

"""
Conveyor transfer submitter is a daemon to manage non-tape file transfers.
"""

import logging
import os
import socket
import sys
import threading
import time
import traceback

from collections import defaultdict
from ConfigParser import NoOptionError
from threadpool import ThreadPool, makeRequests

from rucio.common.config import config_get
from rucio.core import heartbeat
from rucio.core.monitor import record_counter, record_timer

from rucio.daemons.conveyor.utils import get_rses, get_transfers, bulk_group_transfer, submit_transfer

logging.basicConfig(stream=sys.stdout,
                    level=getattr(logging, config_get('common', 'loglevel').upper()),
                    format='%(asctime)s\t%(process)d\t%(levelname)s\t%(message)s')

graceful_stop = threading.Event()


def submitter(once=False, rses=[], mock=False,
              process=0, total_processes=1, total_threads=1,
              bulk=100, group_bulk=1, group_policy='rule', fts_source_strategy='auto',
              activities=None, sleep_time=600, max_sources=4, retry_other_fts=False):
    """
    Main loop to submit a new transfer primitive to a transfertool.
    """

    logging.info('Transfer submitter starting - process (%i/%i) threads (%i)' % (process,
                                                                                 total_processes,
                                                                                 total_threads))

    try:
        scheme = config_get('conveyor', 'scheme')
    except NoOptionError:
        scheme = None
    try:
        failover_scheme = config_get('conveyor', 'failover_scheme')
    except NoOptionError:
        failover_scheme = None
    try:
        cachedir = config_get('conveyor', 'cachedir')
    except NoOptionError:
        cachedir = None
    try:
        timeout = config_get('conveyor', 'submit_timeout')
        timeout = float(timeout)
    except NoOptionError:
        timeout = None

    try:
        bring_online = config_get('conveyor', 'bring_online')
    except NoOptionError:
        bring_online = 43200

    try:
        max_time_in_queue = {}
        timelife_conf = config_get('conveyor', 'max_time_in_queue')
        timelife_confs = timelife_conf.split(",")
        for conf in timelife_confs:
            act, timelife = conf.split(":")
            max_time_in_queue[act.strip()] = int(timelife.strip())
    except NoOptionError:
        max_time_in_queue = {}

    if 'default' not in max_time_in_queue:
        max_time_in_queue['default'] = 168
    logging.debug("Maximum time in queue for different activities: %s" % max_time_in_queue)

    executable = ' '.join(sys.argv)
    hostname = socket.getfqdn()
    pid = os.getpid()
    hb_thread = threading.current_thread()
    heartbeat.sanity_check(executable=executable, hostname=hostname)
    hb = heartbeat.live(executable, hostname, pid, hb_thread)

    logging.info('Transfer submitter started - process (%i/%i) threads (%i/%i) timeout (%s)' % (process, total_processes,
                                                                                                hb['assign_thread'], hb['nr_threads'],
                                                                                                timeout))

    threadPool = ThreadPool(total_threads)
    activity_next_exe_time = defaultdict(time.time)
    sleeping = False

    while not graceful_stop.is_set():

        try:

            if not sleeping:
                hb = heartbeat.live(executable, hostname, pid, hb_thread, older_than=3600)
                logging.info('Transfer submitter - thread (%i/%i) bulk(%i)' % (hb['assign_thread'], hb['nr_threads'], bulk))

                sleeping = True

            if activities is None:
                activities = [None]
            if rses:
                rse_ids = [rse['id'] for rse in rses]
            else:
                rse_ids = None

            for activity in activities:
                if activity_next_exe_time[activity] > time.time():
                    time.sleep(1)
                    continue
                sleeping = False

                logging.info("%s:%s Starting to get transfer transfers for %s" % (process, hb['assign_thread'], activity))
                ts = time.time()
                transfers = get_transfers(process=process, total_processes=total_processes,
                                          thread=hb['assign_thread'],
                                          total_threads=hb['nr_threads'],
                                          failover_schemes=failover_scheme, limit=bulk,
                                          activity=activity, rses=rse_ids, schemes=scheme,
                                          mock=mock, max_sources=max_sources,
                                          bring_online=bring_online,
                                          retry_other_fts=retry_other_fts)
                record_timer('daemons.conveyor.transfer_submitter.get_transfers.per_transfer', (time.time() - ts) * 1000 / (len(transfers) if len(transfers) else 1))
                record_counter('daemons.conveyor.transfer_submitter.get_transfers', len(transfers))
                record_timer('daemons.conveyor.transfer_submitter.get_transfers.transfers', len(transfers))
                logging.info("%s:%s Got %s transfers for %s" % (process, hb['assign_thread'], len(transfers), activity))

                # group transfers
                logging.info("%s:%s Starting to group transfers for %s" % (process, hb['assign_thread'], activity))
                ts = time.time()
                grouped_jobs = bulk_group_transfer(transfers, group_policy, group_bulk, fts_source_strategy, max_time_in_queue)
                record_timer('daemons.conveyor.transfer_submitter.bulk_group_transfer', (time.time() - ts) * 1000 / (len(transfers) if len(transfers) else 1))

                logging.info("%s:%s Starting to submit transfers for %s" % (process, hb['assign_thread'], activity))
                for external_host in grouped_jobs:
                    for job in grouped_jobs[external_host]:
                        # submit transfers
                        # job_requests = makeRequests(submit_transfer, args_list=[((external_host, job, 'transfer_submitter', process, thread), {})])
                        job_requests = makeRequests(submit_transfer, args_list=[((), {'external_host': external_host, 'job': job, 'submitter': 'transfer_submitter', 'process': process,
                                                                                      'thread': hb['assign_thread'], 'cachedir': cachedir, 'timeout': timeout})])
                        [threadPool.putRequest(job_req) for job_req in job_requests]
                threadPool.wait()

                if len(transfers) < group_bulk:
                    logging.info('%i:%i - only %s transfers for %s which is less than group bulk %s, sleep %s seconds' % (process, hb['assign_thread'], len(transfers), activity, group_bulk, sleep_time))
                    if activity_next_exe_time[activity] < time.time():
                        activity_next_exe_time[activity] = time.time() + sleep_time
        except:
            logging.critical('%s:%s %s' % (process, hb['assign_thread'], traceback.format_exc()))

        if once:
            break

    logging.info('%s:%s graceful stop requested' % (process, hb['assign_thread']))

    threadPool.dismissWorkers(total_threads, do_join=True)
    heartbeat.die(executable, hostname, pid, hb_thread)

    logging.info('%s:%s graceful stop done' % (process, hb['assign_thread']))
    return


def stop(signum=None, frame=None):
    """
    Graceful exit.
    """

    graceful_stop.set()


def run(once=False,
        process=0, total_processes=1, total_threads=1, group_bulk=1, group_policy='rule',
        mock=False, rses=[], include_rses=None, exclude_rses=None, bulk=100, fts_source_strategy='auto',
        activities=None, sleep_time=600, max_sources=4, retry_other_fts=False):
    """
    Starts up the conveyer threads.
    """

    if mock:
        logging.info('mock source replicas: enabled')

    working_rses = None
    if rses or include_rses or exclude_rses:
        working_rses = get_rses(rses, include_rses, exclude_rses)
        logging.info("RSE selection: RSEs: %s, Include: %s, Exclude: %s" % (rses,
                                                                            include_rses,
                                                                            exclude_rses))
    else:
        logging.info("RSE selection: automatic")

    logging.info('starting submitter threads')
    threads = [threading.Thread(target=submitter, kwargs={'once': once,
                                                          'process': process,
                                                          'total_processes': total_processes,
                                                          'total_threads': total_threads,
                                                          'rses': working_rses,
                                                          'bulk': bulk,
                                                          'group_bulk': group_bulk,
                                                          'group_policy': group_policy,
                                                          'activities': activities,
                                                          'mock': mock,
                                                          'sleep_time': sleep_time,
                                                          'max_sources': max_sources,
                                                          'fts_source_strategy': fts_source_strategy,
                                                          'retry_other_fts': retry_other_fts})]

    [t.start() for t in threads]

    logging.info('waiting for interrupts')

    # Interruptible joins require a timeout.
    while len(threads) > 0:
        threads = [t.join(timeout=3.14) for t in threads if t and t.isAlive()]
