#!/usr/bin/env python
# -*- encoding: utf-8 -*-
#
# Copyright © 2012 eNovance <licensing@enovance.com>
#
# Author: Julien Danjou <julien@danjou.info>
#
# 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.

import eventlet
import os
import socket
import sys

from oslo.config import cfg
from stevedore import named

from ceilometer.openstack.common import gettextutils
from ceilometer.openstack.common import log
from ceilometer.openstack.common import rpc


OPTS = [
    cfg.StrOpt('host',
               default=socket.gethostname(),
               help='Name of this node.  This can be an opaque identifier.  '
               'It is not necessarily a hostname, FQDN, or IP address. '
               'However, the node name must be valid within '
               'an AMQP key, and if using ZeroMQ, a valid '
               'hostname, FQDN, or IP address'),
    cfg.MultiStrOpt('dispatcher',
                    deprecated_group="collector",
                    default=['database'],
                    help='dispatcher to process data'),
]
cfg.CONF.register_opts(OPTS)

CLI_OPTIONS = [
    cfg.StrOpt('os-username',
               deprecated_group="DEFAULT",
               default=os.environ.get('OS_USERNAME', 'ceilometer'),
               help='Username to use for openstack service access'),
    cfg.StrOpt('os-password',
               deprecated_group="DEFAULT",
               secret=True,
               default=os.environ.get('OS_PASSWORD', 'admin'),
               help='Password to use for openstack service access'),
    cfg.StrOpt('os-tenant-id',
               deprecated_group="DEFAULT",
               default=os.environ.get('OS_TENANT_ID', ''),
               help='Tenant ID to use for openstack service access'),
    cfg.StrOpt('os-tenant-name',
               deprecated_group="DEFAULT",
               default=os.environ.get('OS_TENANT_NAME', 'admin'),
               help='Tenant name to use for openstack service access'),
    cfg.StrOpt('os-cacert',
               default=os.environ.get('OS_CACERT', None),
               help='Certificate chain for SSL validation'),
    cfg.StrOpt('os-auth-url',
               deprecated_group="DEFAULT",
               default=os.environ.get('OS_AUTH_URL',
                                      'http://localhost:5000/v2.0'),
               help='Auth URL to use for openstack service access'),
    cfg.StrOpt('os-region-name',
               deprecated_group="DEFAULT",
               default=os.environ.get('OS_REGION_NAME', None),
               help='Region name to use for openstack service endpoints'),
    cfg.StrOpt('os-endpoint-type',
               default=os.environ.get('OS_ENDPOINT_TYPE', 'publicURL'),
               help='Type of endpoint in Identity service catalog to use for '
                    'communication with OpenStack services.'),
    cfg.BoolOpt('insecure',
                default=False,
                help='Does not perform X.509 certificate validation when'
                     'establishing SSL connection with identity service.'),
]
cfg.CONF.register_cli_opts(CLI_OPTIONS, group="service_credentials")


LOG = log.getLogger(__name__)


class DispatchedService(object):

    DISPATCHER_NAMESPACE = 'ceilometer.dispatcher'

    def __init__(self, *args, **kwargs):
        super(DispatchedService, self).__init__(*args, **kwargs)
        LOG.debug('loading dispatchers from %s',
                  self.DISPATCHER_NAMESPACE)
        self.dispatcher_manager = named.NamedExtensionManager(
            namespace=self.DISPATCHER_NAMESPACE,
            names=cfg.CONF.dispatcher,
            invoke_on_load=True,
            invoke_args=[cfg.CONF])
        if not list(self.dispatcher_manager):
            LOG.warning('Failed to load any dispatchers for %s',
                        self.DISPATCHER_NAMESPACE)


def prepare_service(argv=None):
    eventlet.monkey_patch()
    gettextutils.install('ceilometer', lazy=False)
    rpc.set_defaults(control_exchange='ceilometer')
    cfg.set_defaults(log.log_opts,
                     default_log_levels=['amqplib=WARN',
                                         'qpid.messaging=INFO',
                                         'sqlalchemy=WARN',
                                         'keystoneclient=INFO',
                                         'stevedore=INFO',
                                         'eventlet.wsgi.server=WARN'
                                         ])
    if argv is None:
        argv = sys.argv
    cfg.CONF(argv[1:], project='ceilometer')
    log.setup('ceilometer')