# 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.

"""
Routines for configuring Senlin
"""
import socket

from keystoneauth1 import loading as ks_loading
from oslo_config import cfg
from oslo_middleware import cors
from osprofiler import opts as profiler

from senlin.api.common import wsgi
from senlin.common.i18n import _


# DEFAULT, service
service_opts = [
    cfg.StrOpt('default_region_name',
               help=_('Default region name used to get services endpoints.')),
    cfg.IntOpt('max_response_size',
               default=524288,
               help=_('Maximum raw byte size of data from web response.'))
]

cfg.CONF.register_opts(service_opts)

# DEFAULT, engine
engine_opts = [
    cfg.IntOpt('periodic_interval',
               default=60,
               help=_('Seconds between running periodic tasks.')),
    cfg.IntOpt('periodic_interval_max',
               default=120,
               help=_('Maximum seconds between periodic tasks to be called.')),
    cfg.IntOpt('check_interval_max',
               default=3600,
               help=_('Maximum seconds between cluster check to be called.')),
    cfg.IntOpt('health_check_interval_min',
               default=60,
               help=_('Minimum seconds between health check to be called.')),
    cfg.IntOpt('periodic_fuzzy_delay',
               default=10,
               help=_('Range of seconds to randomly delay when starting the '
                      'periodic task scheduler to reduce stampeding. '
                      '(Disable by setting to 0)')),
    cfg.IntOpt('num_engine_workers',
               default=1,
               help=_('Number of senlin-engine processes to fork and run.')),
    cfg.StrOpt('environment_dir',
               default='/etc/senlin/environments',
               help=_('The directory to search for environment files.')),
    cfg.IntOpt('max_nodes_per_cluster',
               default=1000,
               help=_('Maximum nodes allowed per top-level cluster.')),
    cfg.IntOpt('max_clusters_per_project',
               default=100,
               help=_('Maximum number of clusters any one project may have'
                      ' active at one time.')),
    cfg.IntOpt('default_action_timeout',
               default=3600,
               help=_('Timeout in seconds for actions.')),
    cfg.IntOpt('max_actions_per_batch',
               default=0,
               help=_('Maximum number of node actions that each engine worker '
                      'can schedule consecutively per batch. 0 means no '
                      'limit.')),
    cfg.IntOpt('batch_interval',
               default=3,
               help=_('Seconds to pause between scheduling two consecutive '
                      'batches of node actions.')),
    cfg.IntOpt('lock_retry_times',
               default=3,
               help=_('Number of times trying to grab a lock.')),
    cfg.IntOpt('lock_retry_interval',
               default=10,
               help=_('Number of seconds between lock retries.')),
    cfg.IntOpt('database_retry_limit',
               default=10,
               help=_('Number of times retrying a failed operation on the '
                      'database.')),
    cfg.IntOpt('database_retry_interval',
               default=0.3,
               help=_('Initial number of seconds between database retries.')),
    cfg.IntOpt('database_max_retry_interval',
               default=2,
               help=_('Maximum number of seconds between database retries.')),
    cfg.IntOpt('engine_life_check_timeout',
               default=2,
               help=_('RPC timeout for the engine liveness check that is used'
                      ' for cluster locking.')),
    cfg.BoolOpt('name_unique',
                default=False,
                help=_('Flag to indicate whether to enforce unique names for '
                       'Senlin objects belonging to the same project.')),
    cfg.IntOpt('service_down_time',
               default=60,
               help=_('Maximum time since last check-in for a service to be '
                      'considered up.')),
    cfg.IntOpt('scheduler_thread_pool_size',
               default=1000,
               help=_('Maximum number of threads to use for scheduler.')),
    cfg.IntOpt('health_manager_thread_pool_size',
               default=1000,
               help=_('Maximum number of threads to use for health manager.')),
]
cfg.CONF.register_opts(engine_opts)

# DEFAULT, host
rpc_opts = [
    cfg.HostAddressOpt('host',
                       default=socket.gethostname(),
                       help=_('Name of the engine node. This can be an opaque '
                              'identifier. It is not necessarily a hostname, '
                              'FQDN or IP address.'))
]
cfg.CONF.register_opts(rpc_opts)

# DEFAULT, cloud_backend
cloud_backend_opts = [
    cfg.StrOpt('cloud_backend', default='openstack',
               choices=("openstack", "openstack_test"),
               help=_('Default cloud backend to use.'))]
cfg.CONF.register_opts(cloud_backend_opts)

# DEFAULT, event dispatchers
event_opts = [
    cfg.MultiStrOpt("event_dispatchers", default=['database'],
                    help=_("Event dispatchers to enable."))]
cfg.CONF.register_opts(event_opts)

# Dispatcher section
dispatcher_group = cfg.OptGroup('dispatchers')
dispatcher_opts = [
    cfg.StrOpt('priority', default='info',
               choices=("critical", "error", "warning", "info", "debug"),
               help=_("Lowest event priorities to be dispatched.")),
    cfg.BoolOpt("exclude_derived_actions", default=True,
                help=_("Exclude derived actions from events dumping."))]

cfg.CONF.register_group(dispatcher_group)
cfg.CONF.register_opts(dispatcher_opts, group=dispatcher_group)

# Authentication section
authentication_group = cfg.OptGroup('authentication')
authentication_opts = [
    cfg.StrOpt('auth_url', default='',
               help=_('Complete public identity V3 API endpoint.')),
    cfg.StrOpt('service_username', default='senlin',
               help=_('Senlin service user name.')),
    cfg.StrOpt('service_password', default='', secret=True,
               help=_('Password specified for the Senlin service user.')),
    cfg.StrOpt('service_project_name', default='service',
               help=_('Name of the service project.')),
    cfg.StrOpt('service_user_domain', default='Default',
               help=_('Name of the domain for the service user.')),
    cfg.StrOpt('service_project_domain', default='Default',
               help=_('Name of the domain for the service project.')),
]
cfg.CONF.register_group(authentication_group)
cfg.CONF.register_opts(authentication_opts, group=authentication_group)

# Health Manager Group
healthmgr_group = cfg.OptGroup('health_manager')
healthmgr_opts = [
    cfg.StrOpt('nova_control_exchange', default='nova',
               help=_("Exchange name for nova notifications.")),
    cfg.StrOpt('heat_control_exchange', default='heat',
               help=_("Exchange name for heat notifications.")),
    cfg.MultiStrOpt("enabled_endpoints", default=['nova', 'heat'],
                    help=_("Notification endpoints to enable.")),
]
cfg.CONF.register_group(healthmgr_group)
cfg.CONF.register_opts(healthmgr_opts, group=healthmgr_group)

# Revision group
revision_group = cfg.OptGroup('revision')
revision_opts = [
    cfg.StrOpt('senlin_api_revision', default='1.0',
               help=_('Senlin API revision.')),
    cfg.StrOpt('senlin_engine_revision', default='1.0',
               help=_('Senlin engine revision.'))
]
cfg.CONF.register_group(revision_group)
cfg.CONF.register_opts(revision_opts, group=revision_group)

# Receiver group
receiver_group = cfg.OptGroup('receiver')
receiver_opts = [
    cfg.StrOpt('host', deprecated_group='webhook',
               help=_('The address for notifying and triggering receivers. '
                      'It is useful for case Senlin API service is running '
                      'behind a proxy.')),
    cfg.PortOpt('port', default=8778, deprecated_group='webhook',
                help=_('The port for notifying and triggering receivers. '
                       'It is useful for case Senlin API service is running '
                       'behind a proxy.')),
    cfg.IntOpt('max_message_size', default=65535,
               help=_('The max size(bytes) of message can be posted to '
                      'receiver queue.'))
]
cfg.CONF.register_group(receiver_group)
cfg.CONF.register_opts(receiver_opts, group=receiver_group)

# Notification group
notification_group = cfg.OptGroup('notification')
notification_opts = [
    cfg.IntOpt('max_message_size', default=65535,
               help=_('The max size(bytes) of message can be posted to '
                      'notification queue.')),
    cfg.IntOpt('ttl', default=300,
               help=_('The ttl in seconds of a message posted to '
                      'notification queue.'))
]
cfg.CONF.register_group(notification_group)
cfg.CONF.register_opts(notification_opts, group=notification_group)

# Notification topic
notification_topic_opts = [
    cfg.ListOpt('notification_topics',
                default=['versioned_notifications'],
                help=_('Default notification topic.'))]
cfg.CONF.register_opts(notification_topic_opts)

# Zaqar group
zaqar_group = cfg.OptGroup(
    'zaqar', title='Zaqar Options',
    help=_('Configuration options for zaqar trustee.'))

zaqar_opts = (
    ks_loading.get_auth_common_conf_options() +
    ks_loading.get_auth_plugin_conf_options('password'))

cfg.CONF.register_group(zaqar_group)
ks_loading.register_session_conf_options(cfg.CONF, 'zaqar')
ks_loading.register_auth_conf_options(cfg.CONF, 'zaqar')

# OSProfiler
group, opts = profiler.list_opts()[0]
cfg.CONF.register_opts(opts, group=group)


def list_opts():
    """Return a list of oslo.config options available.

    The purpose of this function is to allow tools like the Oslo sample config
    file generator to discover the options exposed to users by this service.
    The returned list includes all oslo.config options which may be registered
    at runtime by the service api/engine.

    Each element of the list is a tuple. The first element is the name of the
    group under which the list of elements in the second element will be
    registered. A group name of None corresponds to the [DEFAULT] group in
    config files.

    This function is also discoverable via the 'senlin.config' entry point
    under the 'oslo.config.opts' namespace.

    :returns: a list of (group_name, opts) tuples
    """
    for g, o in wsgi.wsgi_opts():
        yield g, o
    yield 'DEFAULT', cloud_backend_opts
    yield 'DEFAULT', rpc_opts
    yield 'DEFAULT', engine_opts
    yield 'DEFAULT', service_opts
    yield 'DEFAULT', event_opts
    yield authentication_group.name, authentication_opts
    yield dispatcher_group.name, dispatcher_opts
    yield healthmgr_group.name, healthmgr_opts
    yield revision_group.name, revision_opts
    yield receiver_group.name, receiver_opts
    yield zaqar_group.name, zaqar_opts
    yield profiler.list_opts()[0]


def set_config_defaults():
    """Update default configuration options for oslo.middleware."""
    cors.set_defaults(
        allow_headers=['X-Auth-Token',
                       'X-Identity-Status',
                       'X-Roles',
                       'X-Service-Catalog',
                       'X-User-Id',
                       'X-Tenant-Id',
                       'X-OpenStack-Request-ID'],
        expose_headers=['X-Auth-Token',
                        'X-Subject-Token',
                        'X-Service-Token',
                        'X-OpenStack-Request-ID'],
        allow_methods=['GET',
                       'PUT',
                       'POST',
                       'DELETE',
                       'PATCH'])
