#    Copyright (c) 2013 Mirantis, Inc.
#
#    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.

"""
Command-line interface to the Murano Project.
"""

from __future__ import print_function

import argparse
import sys

import glanceclient
from keystoneclient.auth.identity.generic.cli import DefaultCLI
from keystoneclient.auth.identity import v3 as identity
from keystoneclient import discover
from keystoneclient import exceptions as ks_exc
from keystoneclient import session as ksession
from oslo_log import handlers
from oslo_log import log as logging
from oslo_utils import encodeutils
import six
import six.moves.urllib.parse as urlparse

import muranoclient
from muranoclient import client as murano_client
from muranoclient.common import utils
from muranoclient.glance import client as art_client
from muranoclient.openstack.common.apiclient import exceptions as exc

logger = logging.getLogger(__name__)

DEFAULT_REPO_URL = "http://apps.openstack.org/api/v1/murano_repo/liberty/"


# quick local fix for keystoneclient bug which blocks built-in reauth
# functionality in case of expired token.
# bug: https://bugs.launchpad.net/python-keystoneclient/+bug/1551392
# fix: https://review.openstack.org/#/c/286236/
class AuthCLI(DefaultCLI):
    def invalidate(self):
        retval = super(AuthCLI, self).invalidate()
        if self._token:
            self._token = None
            retval = True
        return retval


class MuranoShell(object):

    def _append_global_identity_args(self, parser):
        # Register the CLI arguments that have moved to the session object.
        ksession.Session.register_cli_options(parser)

        identity.Password.register_argparse_arguments(parser)

    def get_base_parser(self):

        parser = argparse.ArgumentParser(
            prog='murano',
            description=__doc__.strip(),
            epilog='See "murano help COMMAND" '
                   'for help on a specific command.',
            add_help=False,
            formatter_class=HelpFormatter,
        )

        # Global arguments
        parser.add_argument('-h', '--help',
                            action='store_true',
                            help=argparse.SUPPRESS, )

        parser.add_argument('--version',
                            action='version',
                            version=muranoclient.__version__,
                            help="Show program's version number and exit.")

        parser.add_argument('-d', '--debug',
                            default=bool(utils.env('MURANOCLIENT_DEBUG')),
                            action='store_true',
                            help='Defaults to env[MURANOCLIENT_DEBUG].')

        parser.add_argument('-v', '--verbose',
                            default=False, action="store_true",
                            help="Print more verbose output.")

        # os-cert, os-key, insecure, ca-file are all added
        # by keystone session register_cli_opts later
        parser.add_argument('--cert-file',
                            dest='os_cert',
                            help='DEPRECATED! Use --os-cert.')

        parser.add_argument('--key-file',
                            dest='os_key',
                            help='DEPRECATED! Use --os-key.')

        parser.add_argument('--ca-file',
                            dest='os_cacert',
                            help='DEPRECATED! Use --os-cacert.')

        parser.add_argument('--api-timeout',
                            help='Number of seconds to wait for an '
                                 'API response, '
                                 'defaults to system socket timeout.')

        parser.add_argument('--os-tenant-id',
                            default=utils.env('OS_TENANT_ID'),
                            help='Defaults to env[OS_TENANT_ID].')

        parser.add_argument('--os-tenant-name',
                            default=utils.env('OS_TENANT_NAME'),
                            help='Defaults to env[OS_TENANT_NAME].')

        parser.add_argument('--os-region-name',
                            default=utils.env('OS_REGION_NAME'),
                            help='Defaults to env[OS_REGION_NAME].')

        parser.add_argument('--os-auth-token',
                            default=utils.env('OS_AUTH_TOKEN'),
                            help='Defaults to env[OS_AUTH_TOKEN].')

        parser.add_argument('--os-no-client-auth',
                            default=utils.env('OS_NO_CLIENT_AUTH'),
                            action='store_true',
                            help="Do not contact keystone for a token. "
                                 "Defaults to env[OS_NO_CLIENT_AUTH].")
        parser.add_argument('--murano-url',
                            default=utils.env('MURANO_URL'),
                            help='Defaults to env[MURANO_URL].')

        parser.add_argument('--glance-url',
                            default=utils.env('GLANCE_URL'),
                            help='Defaults to env[GLANCE_URL].')

        parser.add_argument('--glare-url',
                            default=utils.env('GLARE_URL'),
                            help='Defaults to env[GLARE_URL].')

        parser.add_argument('--murano-api-version',
                            default=utils.env(
                                'MURANO_API_VERSION', default='1'),
                            help='Defaults to env[MURANO_API_VERSION] '
                                 'or 1.')

        parser.add_argument('--os-service-type',
                            default=utils.env('OS_SERVICE_TYPE'),
                            help='Defaults to env[OS_SERVICE_TYPE].')

        parser.add_argument('--os-endpoint-type',
                            default=utils.env('OS_ENDPOINT_TYPE'),
                            help='Defaults to env[OS_ENDPOINT_TYPE].')

        parser.add_argument('--include-password',
                            default=bool(utils.env('MURANO_INCLUDE_PASSWORD')),
                            action='store_true',
                            help='Send os-username and os-password to murano.')

        parser.add_argument('--murano-repo-url',
                            default=utils.env(
                                'MURANO_REPO_URL',
                                default=DEFAULT_REPO_URL),
                            help=('Defaults to env[MURANO_REPO_URL] '
                                  'or {0}'.format(DEFAULT_REPO_URL)))

        parser.add_argument('--murano-packages-service',
                            choices=['murano', 'glance', 'glare'],
                            default=utils.env('MURANO_PACKAGES_SERVICE',
                                              default='murano'),
                            help='Specifies if murano-api ("murano") or '
                                 'Glance Artifact Repository ("glare") '
                                 'should be used to store murano packages. '
                                 'Defaults to env[MURANO_PACKAGES_SERVICE] or '
                                 'to "murano"')

        self._append_global_identity_args(parser)

        return parser

    def get_subcommand_parser(self, version):
        parser = self.get_base_parser()

        self.subcommands = {}
        subparsers = parser.add_subparsers(metavar='<subcommand>')
        submodule = utils.import_versioned_module(version, 'shell')
        self._find_actions(subparsers, submodule)
        self._find_actions(subparsers, self)

        self._add_bash_completion_subparser(subparsers)

        return parser

    def _add_bash_completion_subparser(self, subparsers):
        subparser = subparsers.add_parser(
            'bash_completion',
            add_help=False,
            formatter_class=HelpFormatter
        )
        self.subcommands['bash_completion'] = subparser
        subparser.set_defaults(func=self.do_bash_completion)

    def _find_actions(self, subparsers, actions_module):
        for attr in (a for a in dir(actions_module) if a.startswith('do_')):
            # I prefer to be hypen-separated instead of underscores.
            command = attr[3:].replace('_', '-')
            callback = getattr(actions_module, attr)
            desc = callback.__doc__ or ''
            help = desc.strip().split('\n')[0]
            arguments = getattr(callback, 'arguments', [])

            subparser = subparsers.add_parser(command, help=help,
                                              description=desc,
                                              add_help=False,
                                              formatter_class=HelpFormatter)
            subparser.add_argument('-h', '--help', action='help',
                                   help=argparse.SUPPRESS)
            self.subcommands[command] = subparser
            for (args, kwargs) in arguments:
                subparser.add_argument(*args, **kwargs)
            subparser.set_defaults(func=callback)

    def _discover_auth_versions(self, session, auth_url):
        # discover the API versions the server is supporting base on the
        # given URL
        v2_auth_url = None
        v3_auth_url = None
        try:
            ks_discover = discover.Discover(session=session, auth_url=auth_url)
            v2_auth_url = ks_discover.url_for('2.0')
            v3_auth_url = ks_discover.url_for('3.0')
        except ks_exc.ClientException as e:
            # Identity service may not support discover API version.
            # Lets trying to figure out the API version from the original URL.
            url_parts = urlparse.urlparse(auth_url)
            (scheme, netloc, path, params, query, fragment) = url_parts
            path = path.lower()
            if path.startswith('/v3'):
                v3_auth_url = auth_url
            elif path.startswith('/v2'):
                v2_auth_url = auth_url
            else:
                # not enough information to determine the auth version
                msg = ('Unable to determine the Keystone version '
                       'to authenticate with using the given '
                       'auth_url. Identity service may not support API '
                       'version discovery. Please provide a versioned '
                       'auth_url instead. error=%s') % (e)
                raise exc.CommandError(msg)

        return (v2_auth_url, v3_auth_url)

    def _setup_logging(self, debug):
        # Output the logs to command-line interface
        color_handler = handlers.ColorHandler(sys.stdout)
        logger_root = logging.getLogger(None).logger
        logger_root.level = logging.DEBUG if debug else logging.WARNING
        logger_root.addHandler(color_handler)

        # Set the logger level of special library
        logging.getLogger('iso8601') \
            .logger.setLevel(logging.WARNING)
        logging.getLogger('urllib3.connectionpool') \
            .logger.setLevel(logging.WARNING)

    def main(self, argv):
        # Parse args once to find version
        parser = self.get_base_parser()
        (options, args) = parser.parse_known_args(argv)
        self._setup_logging(options.debug)

        # build available subcommands based on version
        api_version = options.murano_api_version
        subcommand_parser = self.get_subcommand_parser(api_version)
        self.parser = subcommand_parser

        keystone_session = None
        keystone_auth = None

        # Handle top-level --help/-h before attempting to parse
        # a command off the command line.
        if (not args and options.help) or not argv:
            self.do_help(options)
            return 0

        # Parse args again and call whatever callback was selected.
        args = subcommand_parser.parse_args(argv)

        # Short-circuit and deal with help command right away.
        if args.func == self.do_help:
            self.do_help(args)
            return 0
        elif args.func == self.do_bash_completion:
            self.do_bash_completion(args)
            return 0

        if not args.os_username and not args.os_auth_token:
            raise exc.CommandError("You must provide a username via"
                                   " either --os-username or env[OS_USERNAME]"
                                   " or a token via --os-auth-token or"
                                   " env[OS_AUTH_TOKEN]")

        if args.os_no_client_auth:
            if not args.murano_url:
                raise exc.CommandError(
                    "If you specify --os-no-client-auth"
                    " you must also specify a Murano API URL"
                    " via either --murano-url or env[MURANO_URL]")
            if (not args.glare_url and
                    args.murano_packages_service in ['glance', 'glare']):
                raise exc.CommandError(
                    "If you specify --os-no-client-auth and"
                    " set murano-packages-service to 'glance'"
                    " you must also specify a glance glare API URL"
                    " via either --glare-url or env[GLARE_API]")

        else:
            # Tenant name or ID is needed to make keystoneclient retrieve a
            # service catalog, it's not required if os_no_client_auth is
            # specified, neither is the auth URL.
            if not any([args.os_tenant_name, args.os_tenant_id,
                        args.os_project_id, args.os_project_name]):
                raise exc.CommandError("You must provide a project name or"
                                       " project id via --os-project-name,"
                                       " --os-project-id, env[OS_PROJECT_ID]"
                                       " or env[OS_PROJECT_NAME]. You may"
                                       " use os-project and os-tenant"
                                       " interchangeably.")
            if not args.os_auth_url:
                raise exc.CommandError("You must provide an auth url via"
                                       " either --os-auth-url or via"
                                       " env[OS_AUTH_URL]")

        endpoint_type = args.os_endpoint_type or 'publicURL'
        endpoint = args.murano_url
        glance_endpoint = args.glance_url

        if args.os_no_client_auth:
            # Authenticate through murano, don't use session
            kwargs = {
                'username': args.os_username,
                'password': args.os_password,
                'auth_token': args.os_auth_token,
                'auth_url': args.os_auth_url,
                'token': args.os_auth_token,
                'insecure': args.insecure,
                'timeout': args.api_timeout
            }
            glance_kwargs = kwargs.copy()

            if args.os_region_name:
                kwargs['region_name'] = args.os_region_name
                glance_kwargs['region_name'] = args.os_region_name
        else:
            # Create a keystone session and keystone auth
            keystone_session = ksession.Session.load_from_cli_options(args)

            args.os_project_name = args.os_project_name or args.os_tenant_name
            args.os_project_id = args.os_project_id or args.os_tenant_id

            # make args compatible with DefaultCLI/AuthCLI
            args.os_token = args.os_auth_token
            args.os_endpoint = ''
            # avoid password prompt if no password given
            args.os_password = args.os_password or '<no password>'
            (v2_auth_url, v3_auth_url) = self._discover_auth_versions(
                keystone_session, args.os_auth_url)
            if v3_auth_url:
                args.os_project_domain_id = (args.os_project_domain_id or
                                             'default')
                args.os_user_domain_id = (args.os_user_domain_id or
                                          'default')

            keystone_auth = AuthCLI.load_from_argparse_arguments(args)

            service_type = args.os_service_type or 'application-catalog'

            if not endpoint:
                endpoint = keystone_auth.get_endpoint(
                    keystone_session,
                    service_type=service_type,
                    interface=endpoint_type,
                    region_name=args.os_region_name)

            kwargs = {
                'session': keystone_session,
                'auth': keystone_auth,
                'service_type': service_type,
                'endpoint_type': endpoint_type,
                'region_name': args.os_region_name,
            }
            glance_kwargs = kwargs.copy()
            del glance_kwargs['endpoint_type']

        if args.api_timeout:
            kwargs['timeout'] = args.api_timeout

        if not glance_endpoint:
            try:
                glance_endpoint = keystone_auth.get_endpoint(
                    keystone_session,
                    service_type='image',
                    interface=endpoint_type,
                    region_name=args.os_region_name)
            except Exception:
                pass

        glance_client = None
        if glance_endpoint:
            try:
                # TODO(starodubcevna): switch back to glance APIv2 when it will
                # be ready for use.
                glance_client = glanceclient.Client(
                    '1', glance_endpoint, **glance_kwargs)
            except Exception:
                pass
        if glance_client:
            kwargs['glance_client'] = glance_client
        else:
            logger.warning("Could not initialise glance client. "
                           "Image creation will be unavailable.")
            kwargs['glance_client'] = None

        if args.murano_packages_service in ['glance', 'glare']:
            glare_endpoint = args.glare_url

            if not glare_endpoint:
                # no glare_endpoint and we requested to store packages in glare
                # let's check keystone
                try:
                    glare_endpoint = keystone_auth.get_endpoint(
                        keystone_session,
                        service_type='artifact',
                        interface=endpoint_type,
                        region_name=args.os_region_name)
                except Exception:
                    raise exc.CommandError(
                        "You set murano-packages-service to {}"
                        " but there is not 'artifact' endpoint in keystone"
                        " Either register one or specify endpoint "
                        " via either --glare-url or env[GLARE_API]".format(
                            args.murano_packages_service))

            auth_token = \
                args.os_auth_token or keystone_auth.get_token(keystone_session)

            artifacts_client = art_client.Client(endpoint=glare_endpoint,
                                                 type_name='murano',
                                                 type_version=1,
                                                 token=auth_token,
                                                 insecure=args.insecure)
            kwargs['artifacts_client'] = artifacts_client

        client = murano_client.Client(api_version, endpoint, **kwargs)

        args.func(client, args)

    def do_bash_completion(self, args):
        """Prints all of the commands and options to stdout."""
        commands = set()
        options = set()
        for sc_str, sc in self.subcommands.items():
            commands.add(sc_str)
            for option in list(sc._optionals._option_string_actions):
                options.add(option)

        commands.remove('bash-completion')
        commands.remove('bash_completion')
        print(' '.join(commands | options))

    @utils.arg('command', metavar='<subcommand>', nargs='?',
               help='Display help for <subcommand>')
    def do_help(self, args):
        """Display help about this program or one of its subcommands."""
        if getattr(args, 'command', None):
            if args.command in self.subcommands:
                self.subcommands[args.command].print_help()
            else:
                msg = "'%s' is not a valid subcommand"
                raise exc.CommandError(msg % args.command)
        else:
            self.parser.print_help()


class HelpFormatter(argparse.HelpFormatter):
    def start_section(self, heading):
        # Title-case the headings
        heading = '%s%s' % (heading[0].upper(), heading[1:])
        super(HelpFormatter, self).start_section(heading)


def main(args=sys.argv[1:]):
    try:
        MuranoShell().main(args)

    except KeyboardInterrupt:
        print('... terminating murano client', file=sys.stderr)
        sys.exit(1)
    except Exception as e:
        if '--debug' in args or '-d' in args:
            raise
        else:
            print(encodeutils.safe_encode(six.text_type(e)), file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()
