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

# Copyright 2011 OpenStack LLC.
# 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.
"""Routines for configuring Reddwarf."""

import re

from reddwarf.openstack.common import config as openstack_config


parse_options = openstack_config.parse_options
add_log_options = openstack_config.add_log_options
add_common_options = openstack_config.add_common_options
setup_logging = openstack_config.setup_logging
get_option = openstack_config.get_option


class Config(object):

    instance = {}

    @classmethod
    def load_paste_app(cls, *args, **kwargs):
        conf, app = openstack_config.load_paste_app(*args, **kwargs)
        cls.instance.update(conf)
        return conf, app

    @classmethod
    def load_paste_config(cls, *args, **kwargs):
        conf_file, conf = openstack_config.load_paste_config(*args, **kwargs)
        cls.instance.update(conf)
        return conf

    @classmethod
    def append_to_config_values(cls, *args):
        config_file = openstack_config.find_config_file(*args)
        if not config_file:
            raise RuntimeError("Unable to locate any configuration file. "
                                "Cannot load application %s" % app_name)
        # Now take the conf file values and append them to the current conf
        with open(config_file, 'r') as conf:
            for line in conf.readlines():
                    m = re.match("\s*([^#]\S+)\s*=\s*(\S+)\s*", line)
                    if m:
                        cls.instance[m.group(1)] = m.group(2)

    @classmethod
    def write_config_values(cls, *args, **kwargs):
        # Pass in empty kwargs so it doesnt mess up the config find
        config_file = openstack_config.find_config_file(*args)
        if not config_file:
            raise RuntimeError("Unable to locate any configuration file. "
                                "Cannot load application %s" % app_name)
        with open(config_file, 'a') as conf:
            for k, v in kwargs.items():
                # Start with newline to be sure its on a new line
                conf.write("\n%s=%s" % (k, v))
        # Now append them to the cls instance
        cls.append_to_config_values(*args)

    @classmethod
    def get(cls, key, default=None):
        return cls.instance.get(key, default)