# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
#
# Copyright (C) 2015-2018, The University of Memphis,
#                          Arizona Board of Regents,
#                          Regents of the University of California.
#
# This file is part of Mini-NDN.
# See AUTHORS.md for a complete list of Mini-NDN authors and contributors.
#
# Mini-NDN is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Mini-NDN is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Mini-NDN, e.g., in COPYING.md file.
# If not, see <http://www.gnu.org/licenses/>.

from ndn.experiments.experiment import Experiment
from ndn.apps.ndn_ping_client import NDNPingClient

import time

class MCNFailureExperiment(Experiment):

    def __init__(self, args):
        Experiment.__init__(self, args)

        self.PING_COLLECTION_TIME_BEFORE_FAILURE = 60
        self.PING_COLLECTION_TIME_AFTER_RECOVERY = 120

    def getMostConnectedNode(self):
        mcn = max(self.net.hosts, key=lambda host: len(host.intfNames()))
        print "The most connected node is: {}".format(mcn.name)
        return mcn

    def setup(self):
        if self.options.nPings != 0:
            Experiment.setup(self)

    def run(self):
        mostConnectedNode = self.getMostConnectedNode()

        if self.options.nPings != 0:
            self.startPctPings()

        # After the pings are scheduled, collect pings for 1 minute
        time.sleep(self.PING_COLLECTION_TIME_BEFORE_FAILURE)

        # Bring down MCN
        self.failNode(mostConnectedNode)

        # MCN is down for 2 minutes
        time.sleep(int(self.options.arguments.waitTime))

        # Bring MCN back up
        self.recoverNode(mostConnectedNode)

        # Restart pings
        if self.options.nPings != 0:
            for nodeToPing in self.pingedDict[mostConnectedNode]:
                 NDNPingClient.ping(mostConnectedNode, nodeToPing, self.PING_COLLECTION_TIME_AFTER_RECOVERY)

            # Collect pings for more seconds after MCN is up
            time.sleep(self.PING_COLLECTION_TIME_AFTER_RECOVERY)
        else:
            self.checkConvergence()

    @staticmethod
    def parseArguments(parser):
        parser.add_argument("--wait-time", dest="waitTime", default="120",
                            help="[Experiment] Generic wait time for experiment use")

Experiment.register("mcn-failure", MCNFailureExperiment)