# 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 Glance
"""

import logging
import logging.config
import logging.handlers
import os
import sys

from oslo.config import cfg
from paste import deploy

from muranoconductor import __version__ as version
from ConfigParser import SafeConfigParser

paste_deploy_opts = [
    cfg.StrOpt('flavor'),
    cfg.StrOpt('config_file'),
]

rabbit_opts = [
    cfg.StrOpt('host', default='localhost'),
    cfg.IntOpt('port', default=5672),
    cfg.StrOpt('login', default='guest'),
    cfg.StrOpt('password', default='guest'),
    cfg.StrOpt('virtual_host', default='/'),
    cfg.BoolOpt('ssl', default=False),
    cfg.StrOpt('ca_certs', default='')
]

heat_opts = [
    cfg.BoolOpt('insecure', default=False),
    cfg.StrOpt('ca_file'),
    cfg.StrOpt('cert_file'),
    cfg.StrOpt('key_file'),
    cfg.StrOpt('endpoint_type', default='publicURL')
]

quantum_opts = [
    cfg.BoolOpt('insecure', default=False),
    cfg.StrOpt('ca_cert'),
    cfg.StrOpt('endpoint_type', default='publicURL')
]

keystone_opts = [
    cfg.StrOpt('auth_url'),
    cfg.BoolOpt('insecure', default=False),
    cfg.StrOpt('ca_file'),
    cfg.StrOpt('cert_file'),
    cfg.StrOpt('key_file')
]

CONF = cfg.CONF
CONF.register_opts(paste_deploy_opts, group='paste_deploy')
CONF.register_opts(rabbit_opts, group='rabbitmq')
CONF.register_opts(heat_opts, group='heat')
CONF.register_opts(quantum_opts, group='quantum')
CONF.register_opts(keystone_opts, group='keystone')
CONF.register_opt(cfg.StrOpt('file_server'))
CONF.register_cli_opt(cfg.StrOpt('data_dir', default='./'))

CONF.register_opt(cfg.IntOpt('max_environments', default=20))


CONF.import_opt('verbose', 'muranoconductor.openstack.common.log')
CONF.import_opt('debug', 'muranoconductor.openstack.common.log')
CONF.import_opt('log_dir', 'muranoconductor.openstack.common.log')
CONF.import_opt('log_file', 'muranoconductor.openstack.common.log')
CONF.import_opt('log_config', 'muranoconductor.openstack.common.log')
CONF.import_opt('log_format', 'muranoconductor.openstack.common.log')
CONF.import_opt('log_date_format', 'muranoconductor.openstack.common.log')
CONF.import_opt('use_syslog', 'muranoconductor.openstack.common.log')
CONF.import_opt('syslog_log_facility', 'muranoconductor.openstack.common.log')


def parse_args(args=None, usage=None, default_config_files=None):
    CONF(args=args,
         project='conductor',
         version=version,
         usage=usage,
         default_config_files=default_config_files)


def setup_logging():
    """
    Sets up the logging options for a log with supplied name
    """

    if CONF.log_config:
        # Use a logging configuration file for all settings...
        if os.path.exists(CONF.log_config):
            logging.config.fileConfig(CONF.log_config)
            return
        else:
            raise RuntimeError("Unable to locate specified logging "
                               "config file: %s" % CONF.log_config)

    root_logger = logging.root
    if CONF.debug:
        root_logger.setLevel(logging.DEBUG)
    elif CONF.verbose:
        root_logger.setLevel(logging.INFO)
    else:
        root_logger.setLevel(logging.WARNING)

    formatter = logging.Formatter(CONF.log_format, CONF.log_date_format)

    if CONF.use_syslog:
        try:
            facility = getattr(logging.handlers.SysLogHandler,
                               CONF.syslog_log_facility)
        except AttributeError:
            raise ValueError(_("Invalid syslog facility"))

        handler = logging.handlers.SysLogHandler(address='/dev/log',
                                                 facility=facility)
    elif CONF.log_file:
        logfile = CONF.log_file
        if CONF.log_dir:
            logfile = os.path.join(CONF.log_dir, logfile)
        handler = logging.handlers.WatchedFileHandler(logfile)
    else:
        handler = logging.StreamHandler(sys.stdout)

    handler.setFormatter(formatter)
    root_logger.addHandler(handler)


def _get_deployment_flavor():
    """
    Retrieve the paste_deploy.flavor config item, formatted appropriately
    for appending to the application name.
    """
    flavor = CONF.paste_deploy.flavor
    return '' if not flavor else ('-' + flavor)


def _get_paste_config_path():
    paste_suffix = '-paste.ini'
    conf_suffix = '.conf'
    if CONF.config_file:
        # Assume paste config is in a paste.ini file corresponding
        # to the last config file
        path = CONF.config_file[-1].replace(conf_suffix, paste_suffix)
    else:
        path = CONF.prog + '-paste.ini'
    return CONF.find_file(os.path.basename(path))


def _get_deployment_config_file():
    """
    Retrieve the deployment_config_file config item, formatted as an
    absolute pathname.
    """
    path = CONF.paste_deploy.config_file
    if not path:
        path = _get_paste_config_path()
    if not path:
        msg = "Unable to locate paste config file for %s." % CONF.prog
        raise RuntimeError(msg)
    return os.path.abspath(path)


def load_paste_app(app_name=None):
    """
    Builds and returns a WSGI app from a paste config file.

    We assume the last config file specified in the supplied ConfigOpts
    object is the paste config file.

    :param app_name: name of the application to load

    :raises RuntimeError when config file cannot be located or application
            cannot be loaded from config file
    """
    if app_name is None:
        app_name = CONF.prog

    # append the deployment flavor to the application name,
    # in order to identify the appropriate paste pipeline
    app_name += _get_deployment_flavor()

    conf_file = _get_deployment_config_file()

    try:
        logger = logging.getLogger(__name__)
        logger.debug(_("Loading %(app_name)s from %(conf_file)s"),
                     {'conf_file': conf_file, 'app_name': app_name})

        app = deploy.loadapp("config:%s" % conf_file, name=app_name)

        # Log the options used when starting if we're in debug mode...
        if CONF.debug:
            CONF.log_opt_values(logger, logging.DEBUG)

        return app
    except (LookupError, ImportError), e:
        msg = _("Unable to load %(app_name)s from "
                "configuration file %(conf_file)s."
                "\nGot: %(e)r") % locals()
        logger.error(msg)
        raise RuntimeError(msg)


class Config(object):
    def get_setting(self, section, name, default=None):
        group = CONF
        if section and section != 'DEFAULT':
            group = group.get(section, default)
        return group.get(name, default)

    def __getitem__(self, item):
        parts = item.rsplit('.', 1)
        return self.get_setting(
            parts[0] if len(parts) == 2 else 'DEFAULT', parts[-1])
