# Copyright (c) 2015 All rights reserved
# This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
#
# http://www.apache.org/licenses/LICENSE-2.0

from functest.utils.constants import CONST

from snaps.openstack.utils import neutron_utils, nova_utils


def get_ext_net_name(os_creds):
    """
    Returns the configured external network name or
    the first retrieved external network name
    :param: os_creds: an instance of snaps OSCreds object
    :return:
    """
    neutron = neutron_utils.neutron_client(os_creds)
    ext_nets = neutron_utils.get_external_networks(neutron)
    if (hasattr(CONST, 'EXTERNAL_NETWORK')):
        extnet_config = CONST.__getattribute__('EXTERNAL_NETWORK')
        for ext_net in ext_nets:
            if ext_net.name == extnet_config:
                return extnet_config
    return ext_nets[0].name if ext_nets else ""


def get_active_compute_cnt(os_creds):
    """
    Returns the number of active compute servers
    :param: os_creds: an instance of snaps OSCreds object
    :return: the number of active compute servers
    """
    nova = nova_utils.nova_client(os_creds)
    computes = nova_utils.get_availability_zone_hosts(nova, zone_name='nova')
    return len(computes)