# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2012 Cloudbase Solutions Srl
#
#    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 os
import shutil
import tempfile
import uuid

from oslo.config import cfg

from cloudbaseinit.metadata.services import base
from cloudbaseinit.openstack.common import log as logging
from cloudbaseinit.metadata.services.configdrive import manager

opts = [
    cfg.BoolOpt('config_drive_raw_hhd', default=True,
                help='Look for an ISO config drive in raw HDDs'),
    cfg.BoolOpt('config_drive_cdrom', default=True,
                help='Look for a config drive in the attached cdrom drives'),
]

CONF = cfg.CONF
CONF.register_opts(opts)

LOG = logging.getLogger(__name__)


class ConfigDriveService(base.BaseMetadataService):
    def __init__(self):
        super(ConfigDriveService, self).__init__()
        self._metadata_path = None

    def load(self):
        super(ConfigDriveService, self).load()

        target_path = os.path.join(tempfile.gettempdir(), str(uuid.uuid4()))

        mgr = manager.ConfigDriveManager()
        found = mgr.get_config_drive_files(target_path,
                                           CONF.config_drive_raw_hhd,
                                           CONF.config_drive_cdrom)
        if found:
            self._metadata_path = target_path
            LOG.debug('Metadata copied to folder: \'%s\'' %
                      self._metadata_path)
        return found

    def _get_data(self, path):
        norm_path = os.path.normpath(os.path.join(self._metadata_path, path))
        try:
            with open(norm_path, 'rb') as f:
                return f.read()
        except IOError:
            raise base.NotExistingMetadataException()

    def cleanup(self):
        if self._metadata_path:
            LOG.debug('Deleting metadata folder: \'%s\'' % self._metadata_path)
            shutil.rmtree(self._metadata_path, True)
            self._metadata_path = None