#
#    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.

from heat.common.i18n import _
from heat.engine import clients
from heat.engine import constraints
from heat.engine import properties
from heat.engine import resource
from heat.engine import support


class MonascaNotification(resource.Resource):
    """Heat Template Resource for Monasca Notification.

    This plug-in requires python-monascaclient>=1.0.22. So to enable this
    plug-in, install this client library and restart the heat-engine.

    A resource which is used to notificate if there is some alarm.
    """

    support_status = support.SupportStatus(
        version='5.0.0',
        status=support.UNSUPPORTED)

    default_client_name = 'monasca'

    entity = 'notifications'

    NOTIFICATION_TYPES = (
        EMAIL, WEBHOOK, PAGERDUTY
    ) = (
        'email', 'webhook', 'pagerduty'
    )

    PROPERTIES = (
        NAME, TYPE, ADDRESS
    ) = (
        'name', 'type', 'address'
    )

    properties_schema = {
        NAME: properties.Schema(
            properties.Schema.STRING,
            _('Name of the notification. By default, physical resource name '
              'is used.'),
            update_allowed=True
        ),
        TYPE: properties.Schema(
            properties.Schema.STRING,
            _('Type of the notification.'),
            update_allowed=True,
            required=True,
            constraints=[constraints.AllowedValues(
                NOTIFICATION_TYPES
            )]
        ),
        ADDRESS: properties.Schema(
            properties.Schema.STRING,
            _('Address of the notification. It could be a valid email '
              'address, url or service key based on notification type.'),
            update_allowed=True,
            required=True,
        )
    }

    def handle_create(self):
        args = dict(
            name=(self.properties[self.NAME] or
                  self.physical_resource_name()),
            type=self.properties[self.TYPE],
            address=self.properties[self.ADDRESS]
        )

        notification = self.client().notifications.create(**args)
        self.resource_id_set(notification['id'])

    def handle_update(self,
                      prop_diff,
                      json_snippet=None,
                      tmpl_diff=None):
        args = dict(notification_id=self.resource_id)

        args['name'] = (prop_diff.get(self.NAME) or
                        self.properties[self.NAME])

        args['type'] = (prop_diff.get(self.TYPE) or
                        self.properties[self.TYPE])

        args['address'] = (prop_diff.get(self.ADDRESS) or
                           self.properties[self.ADDRESS])

        self.client().notifications.update(**args)

    def handle_delete(self):
        if self.resource_id is not None:
            with self.client_plugin().ignore_not_found:
                self.client().notifications.delete(
                    notification_id=self.resource_id)

    # FIXME(kanagaraj-manickam) Remove this method once monasca defect 1484900
    # is fixed.
    def _show_resource(self):
        return self.client().notifications.get(self.resource_id)


def resource_mapping():
    return {
        'OS::Monasca::Notification': MonascaNotification
    }


def available_resource_mapping():
    if not clients.has_client(MonascaNotification.default_client_name):
        return {}

    return resource_mapping()