# Copyright 2016 Nokia
#
# 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.


"""
Vitrage command line interface
"""

from __future__ import print_function

import logging
import os
import sys
import warnings

from cliff import app
from cliff import commandmanager
from keystoneauth1 import loading

import client

from v1.cli import alarm
from v1.cli import rca
from v1.cli import resource
from v1.cli import template
from v1.cli import topology
from vitrageclient import __version__


class VitrageCommandManager(commandmanager.CommandManager):
    COMMANDS = {
        'topology show': topology.TopologyShow,
        'resource show': resource.ResourceShow,
        'resource list': resource.ResourceList,
        'alarm list': alarm.AlarmList,
        'rca show': rca.RcaShow,
        'template validate': template.TemplateValidate,
        'template list': template.TemplateList,
        'template show': template.TemplateShow,
    }

    def load_commands(self, namespace):
        for k, v in self.COMMANDS.items():
            self.add_command(k, v)


class VitrageShell(app.App):
    def __init__(self):
        super(VitrageShell, self).__init__(
            description=__doc__,
            version=__version__,
            command_manager=VitrageCommandManager(None),
            deferred_help=True)

        self._client = None

    def build_option_parser(self, description, version, **argparse_kwargs):
        """Return an argparse option parser for this application.

        Subclasses may override this method to extend
        the parser with more global options.

        :param description: full description of the application
        :paramtype description: str
        :param version: version number for the application
        :paramtype version: str
        :param argparse_kwargs: extra keyword argument passed to the
                                ArgumentParser constructor
        :paramtype extra_kwargs: dict
        """

        parser = super(VitrageShell, self).build_option_parser(
            description, version, argparse_kwargs={'allow_abbrev': False})

        self.register_keyauth_argparse_arguments(parser)

        parser.add_argument('--vitrage-api-version',
                            default=os.environ.get('VITRAGE_API_VERSION', '1'),
                            help='Defaults to env[VITRAGE_API_VERSION] or 1.')

        parser.add_argument('--endpoint',
                            default=os.environ.get('VITRAGE_ENDPOINT'),
                            help='Vitrage endpoint (Env: VITRAGE_ENDPOINT)')

        return parser

    @staticmethod
    def register_keyauth_argparse_arguments(parser):
        parser.add_argument(
            '--os-region-name',
            metavar='<auth-region-name>',
            dest='region_name',
            default=os.environ.get('OS_REGION_NAME'),
            help='Authentication region name (Env: OS_REGION_NAME)')
        parser.add_argument(
            '--os-interface',
            metavar='<interface>',
            dest='interface',
            choices=['admin', 'public', 'internal'],
            default=os.environ.get('OS_INTERFACE'),
            help='Select an interface type.'
                 ' Valid interface types: [admin, public, internal].'
                 ' (Env: OS_INTERFACE)')

        loading.register_session_argparse_arguments(parser=parser)

        loading.register_auth_argparse_arguments(parser=parser, argv=sys.argv,
                                                 default='password')

    @property
    def client(self):
        if self._client is None:
            if hasattr(self.options, "endpoint"):
                endpoint_override = self.options.endpoint
            else:
                endpoint_override = None
            auth_plugin = loading.load_auth_from_argparse_arguments(
                self.options)
            session = loading.load_session_from_argparse_arguments(
                self.options, auth=auth_plugin)

            # noinspection PyAttributeOutsideInit
            self._client = client.Client(
                self.options.vitrage_api_version,
                session=session,
                interface=self.options.interface,
                region_name=self.options.region_name,
                endpoint_override=endpoint_override)

        return self._client

    def configure_logging(self):
        if self.options.debug:
            self._set_debug_logging_messages()

        super(VitrageShell, self).configure_logging()
        root_logger = logging.getLogger('')

        self._configure_logging_messages(root_logger)
        self._hide_useless_logging_messages()

    def _set_debug_logging_messages(self):
        self.options.verbose_level = 3

    def _configure_logging_messages(self, root_logger):
        if self.options.verbose_level == 0:
            self._set_quiet_logging_messages(root_logger)
        elif self.options.verbose_level == 1:
            self._set_default_logging_messages(root_logger)
        elif self.options.verbose_level == 2:
            self._set_verbose_logging_messages(root_logger)
        elif self.options.verbose_level >= 3:
            self._set_double_verbose_logging_messages(root_logger)

    @staticmethod
    def _set_double_verbose_logging_messages(root_logger):
        root_logger.setLevel(logging.DEBUG)

    @staticmethod
    def _set_verbose_logging_messages(root_logger):
        root_logger.setLevel(logging.INFO)
        warnings.simplefilter("once")

    @staticmethod
    def _set_default_logging_messages(root_logger):
        root_logger.setLevel(logging.WARNING)
        warnings.simplefilter("ignore")

    @staticmethod
    def _set_quiet_logging_messages(root_logger):
        root_logger.setLevel(logging.ERROR)
        warnings.simplefilter("ignore")

    def _hide_useless_logging_messages(self):
        requests_log = logging.getLogger('requests')
        cliff_log = logging.getLogger('cliff')
        stevedore_log = logging.getLogger('stevedore')
        iso8601_log = logging.getLogger('iso8601')
        cliff_log.setLevel(logging.ERROR)
        stevedore_log.setLevel(logging.ERROR)
        iso8601_log.setLevel(logging.ERROR)
        if self.options.debug:
            requests_log.setLevel(logging.DEBUG)
        else:
            requests_log.setLevel(logging.ERROR)


def main(args=None):
    try:
        if args is None:
            args = sys.argv[1:]
        return VitrageShell().run(args)
    except KeyboardInterrupt:
        print('... terminating vitrage client', file=sys.stderr)
        sys.exit(1)
    except Exception as e:
        print(e)
        sys.exit(1)


if __name__ == '__main__':
    main()