#    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.
"""
Handles all requests related to user facing messages.
"""
import datetime

from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import timeutils
import six

from manila.db import base
from manila.message import message_field
from manila.message import message_levels


messages_opts = [
    cfg.IntOpt('message_ttl', default=2592000,
               help='Message minimum life in seconds.'),
    cfg.IntOpt('message_reap_interval', default=86400,
               help='Interval between periodic task runs to clean expired '
                    'messages in seconds.'),
]

CONF = cfg.CONF
CONF.register_opts(messages_opts)

LOG = logging.getLogger(__name__)


class API(base.Base):
    """API for handling user messages."""

    def create(self, context, action, project_id, resource_type=None,
               resource_id=None, exception=None, detail=None,
               level=message_levels.ERROR):
        """Create a message with the specified information."""
        LOG.info("Creating message record for request_id = %s",
                 context.request_id)

        # Updates expiry time for message as per message_ttl config.
        expires_at = (timeutils.utcnow() + datetime.timedelta(
                      seconds=CONF.message_ttl))
        detail_id = message_field.translate_detail_id(exception, detail)

        message_record = {
            'project_id': project_id,
            'request_id': context.request_id,
            'resource_type': resource_type,
            'resource_id': resource_id,
            'action_id': action[0],
            'detail_id': detail_id,
            'message_level': level,
            'expires_at': expires_at,
        }
        try:
            self.db.message_create(context, message_record)
        except Exception:
            LOG.exception(("Failed to create message record "
                           "for request_id %s"), context.request_id)

    def get(self, context, id):
        """Return message with the specified message id."""
        return self.db.message_get(context, id)

    def get_all(self, context, search_opts={}, sort_key=None, sort_dir=None):
        """Return messages for the given context."""
        LOG.debug("Searching for messages by: %s",
                  six.text_type(search_opts))

        messages = self.db.message_get_all(
            context, filters=search_opts, sort_key=sort_key, sort_dir=sort_dir)

        return messages

    def delete(self, context, id):
        """Delete message with the specified message id."""
        return self.db.message_destroy(context, id)

    def cleanup_expired_messages(self, context):
        ctx = context.elevated()
        count = self.db.cleanup_expired_messages(ctx)
        LOG.info("Deleted %s expired messages.", count)
