# Copyright 2012 OpenStack Foundation
# All Rights Reserved.
#
#    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 logging as std_logging
import os

from oslo_config import cfg
from oslo_log import log as logging

from gceapi.tests.functional import config_opts


LOG = logging.getLogger('gceapi')


def get_base_dir():
    cur_dir = os.path.dirname(__file__)
    base_dir = os.path.dirname(os.path.dirname(os.path.dirname(cur_dir)))
    return os.environ.get('TEST_CONFIG_DIR', base_dir)


# This should never be called outside of this class
class ConfigPrivate(object):
    """Provides OpenStack configuration information."""

    def __init__(self):
        """Initialize a configuration from a conf directory and conf file."""
        super(ConfigPrivate, self).__init__()

        # if this was run from tempest runner then config already parsed
        if config_opts.OPTIONS_GROUP.name in cfg.CONF:
            self.gce = cfg.CONF.gce
            return

        cfg_file_path = self._get_default_config_path(get_base_dir())
        config_files = []
        if os.path.exists(cfg_file_path):
            config_files.append(cfg_file_path)

        conf = cfg.CONF
        conf([], project='gceapi', default_config_files=config_files)
        conf.register_group(config_opts.OPTIONS_GROUP)
        group_name = config_opts.OPTIONS_GROUP.name
        for opt in config_opts.OPTIONS:
            conf.register_opt(opt, group=group_name)
        self.gce = cfg.CONF.gce
        conf.log_opt_values(LOG, std_logging.DEBUG)

    @staticmethod
    def _get_default_config_path(base_dir):
        conf_file = os.environ.get('TEST_CONFIG', 'functional_tests.conf')
        return os.path.join(base_dir, conf_file)


class ConfigProxy(object):
    _config = None

    def __getattr__(self, attr):
        if not self._config:
            self._config = ConfigPrivate()

        return getattr(self._config, attr)


CONF = ConfigProxy()