#   Copyright 2012-2013 OpenStack Foundation
#   Copyright 2015 Dean Troyer
#
#   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 OpenStack APIs"""

import getpass
import logging
import sys
import traceback

from cliff import app
from cliff import command
from cliff import complete
from cliff import help
from oslo_utils import strutils

import openstackclient
from openstackclient.common import clientmanager
from openstackclient.common import commandmanager
from openstackclient.common import exceptions as exc
from openstackclient.common import logs
from openstackclient.common import timing
from openstackclient.common import utils

from os_client_config import config as cloud_config


DEFAULT_DOMAIN = 'default'


def prompt_for_password(prompt=None):
    """Prompt user for a password

    Prompt for a password if stdin is a tty.
    """

    if not prompt:
        prompt = 'Password: '
    pw = None
    # If stdin is a tty, try prompting for the password
    if hasattr(sys.stdin, 'isatty') and sys.stdin.isatty():
        # Check for Ctl-D
        try:
            pw = getpass.getpass(prompt)
        except EOFError:
            pass
    # No password because we did't have a tty or nothing was entered
    if not pw:
        raise exc.CommandError(
            "No password entered, or found via --os-password or OS_PASSWORD",
        )
    return pw


class OpenStackShell(app.App):

    CONSOLE_MESSAGE_FORMAT = '%(levelname)s: %(name)s %(message)s'

    log = logging.getLogger(__name__)
    timing_data = []

    def __init__(self):
        # Patch command.Command to add a default auth_required = True
        command.Command.auth_required = True

        # Some commands do not need authentication
        help.HelpCommand.auth_required = False
        complete.CompleteCommand.auth_required = False

        # Slight change to the meaning of --debug
        self.DEFAULT_DEBUG_VALUE = None
        self.DEFAULT_DEBUG_HELP = 'Set debug logging and traceback on errors.'

        super(OpenStackShell, self).__init__(
            description=__doc__.strip(),
            version=openstackclient.__version__,
            command_manager=commandmanager.CommandManager('openstack.cli'),
            deferred_help=True)

        self.api_version = {}

        # Until we have command line arguments parsed, dump any stack traces
        self.dump_stack_trace = True

        # Assume TLS host certificate verification is enabled
        self.verify = True

        self.client_manager = None
        self.command_options = None

    def configure_logging(self):
        """Configure logging for the app."""
        self.log_configurator = logs.LogConfigurator(self.options)
        self.dump_stack_trace = self.log_configurator.dump_trace

    def run(self, argv):
        ret_val = 1
        self.command_options = argv
        try:
            ret_val = super(OpenStackShell, self).run(argv)
            return ret_val
        except Exception as e:
            if not logging.getLogger('').handlers:
                logging.basicConfig()
            if self.dump_stack_trace:
                self.log.error(traceback.format_exc())
            else:
                self.log.error('Exception raised: ' + str(e))

            return ret_val

        finally:
            self.log.info("END return value: %s", ret_val)

    def build_option_parser(self, description, version):
        parser = super(OpenStackShell, self).build_option_parser(
            description,
            version)

        # service token auth argument
        parser.add_argument(
            '--os-cloud',
            metavar='<cloud-config-name>',
            dest='cloud',
            default=utils.env('OS_CLOUD'),
            help='Cloud name in clouds.yaml (Env: OS_CLOUD)',
        )
        # Global arguments
        parser.add_argument(
            '--os-region-name',
            metavar='<auth-region-name>',
            dest='region_name',
            default=utils.env('OS_REGION_NAME'),
            help='Authentication region name (Env: OS_REGION_NAME)')
        parser.add_argument(
            '--os-cacert',
            metavar='<ca-bundle-file>',
            dest='cacert',
            default=utils.env('OS_CACERT'),
            help='CA certificate bundle file (Env: OS_CACERT)')
        verify_group = parser.add_mutually_exclusive_group()
        verify_group.add_argument(
            '--verify',
            action='store_true',
            default=None,
            help='Verify server certificate (default)',
        )
        verify_group.add_argument(
            '--insecure',
            action='store_true',
            default=None,
            help='Disable server certificate verification',
        )
        parser.add_argument(
            '--os-default-domain',
            metavar='<auth-domain>',
            dest='default_domain',
            default=utils.env(
                'OS_DEFAULT_DOMAIN',
                default=DEFAULT_DOMAIN),
            help='Default domain ID, default=' +
                 DEFAULT_DOMAIN +
                 ' (Env: OS_DEFAULT_DOMAIN)')
        parser.add_argument(
            '--os-interface',
            metavar='<interface>',
            dest='interface',
            choices=['admin', 'public', 'internal'],
            default=utils.env('OS_INTERFACE'),
            help='Select an interface type.'
                 ' Valid interface types: [admin, public, internal].'
                 ' (Env: OS_INTERFACE)')
        parser.add_argument(
            '--timing',
            default=False,
            action='store_true',
            help="Print API call timing info",
        )

        return clientmanager.build_plugin_option_parser(parser)

    def initialize_app(self, argv):
        """Global app init bits:

        * set up API versions
        * validate authentication info
        * authenticate against Identity if requested
        """

        # Parent __init__ parses argv into self.options
        super(OpenStackShell, self).initialize_app(argv)
        self.log.info("START with options: %s",
                      strutils.mask_password(self.command_options))
        self.log.debug("options: %s",
                       strutils.mask_password(self.options))

        # Set the default plugin to token_endpoint if url and token are given
        if (self.options.url and self.options.token):
            # Use service token authentication
            auth_type = 'token_endpoint'
        else:
            auth_type = 'password'

        project_id = getattr(self.options, 'project_id', None)
        project_name = getattr(self.options, 'project_name', None)
        tenant_id = getattr(self.options, 'tenant_id', None)
        tenant_name = getattr(self.options, 'tenant_name', None)

        # handle some v2/v3 authentication inconsistencies by just acting like
        # both the project and tenant information are both present. This can
        # go away if we stop registering all the argparse options together.
        if project_id and not tenant_id:
            self.options.tenant_id = project_id
        if project_name and not tenant_name:
            self.options.tenant_name = project_name
        if tenant_id and not project_id:
            self.options.project_id = tenant_id
        if tenant_name and not project_name:
            self.options.project_name = tenant_name

        # Do configuration file handling
        # Ignore the default value of interface. Only if it is set later
        # will it be used.
        cc = cloud_config.OpenStackConfig(
            override_defaults={
                'interface': None,
                'auth_type': auth_type,
                },
            )

        # TODO(thowe): Change cliff so the default value for debug
        # can be set to None.
        if not self.options.debug:
            self.options.debug = None
        self.cloud = cc.get_one_cloud(
            cloud=self.options.cloud,
            argparse=self.options,
        )

        self.log_configurator.configure(self.cloud)
        self.dump_stack_trace = self.log_configurator.dump_trace
        self.log.debug("defaults: %s", cc.defaults)
        self.log.debug("cloud cfg: %s",
                       strutils.mask_password(self.cloud.config))

        # Set up client TLS
        # NOTE(dtroyer): --insecure is the non-default condition that
        #                overrides any verify setting in clouds.yaml
        #                so check it first, then fall back to any verify
        #                setting provided.
        self.verify = not self.cloud.config.get(
            'insecure',
            not self.cloud.config.get('verify', True),
        )

        # NOTE(dtroyer): Per bug https://bugs.launchpad.net/bugs/1447784
        #                --insecure now overrides any --os-cacert setting,
        #                where before --insecure was ignored if --os-cacert
        #                was set.
        if self.verify and self.cloud.cacert:
            self.verify = self.cloud.cacert

        # Save default domain
        self.default_domain = self.options.default_domain

        # Loop through extensions to get API versions
        for mod in clientmanager.PLUGIN_MODULES:
            default_version = getattr(mod, 'DEFAULT_API_VERSION', None)
            option = mod.API_VERSION_OPTION.replace('os_', '')
            version_opt = str(self.cloud.config.get(option, default_version))
            if version_opt:
                api = mod.API_NAME
                self.api_version[api] = version_opt

                # Add a plugin interface to let the module validate the version
                # requested by the user
                skip_old_check = False
                mod_check_api_version = getattr(mod, 'check_api_version', None)
                if mod_check_api_version:
                    # this throws an exception if invalid
                    skip_old_check = mod_check_api_version(version_opt)

                mod_versions = getattr(mod, 'API_VERSIONS', None)
                if not skip_old_check and mod_versions:
                    if version_opt not in mod_versions:
                        self.log.warning(
                            "%s version %s is not in supported versions %s"
                            % (api, version_opt,
                               ', '.join(mod.API_VERSIONS.keys())))

                # Command groups deal only with major versions
                version = '.v' + version_opt.replace('.', '_').split('_')[0]
                cmd_group = 'openstack.' + api.replace('-', '_') + version
                self.command_manager.add_command_group(cmd_group)
                self.log.debug(
                    '%(name)s API version %(version)s, cmd group %(group)s',
                    {'name': api, 'version': version_opt, 'group': cmd_group}
                )

        # Commands that span multiple APIs
        self.command_manager.add_command_group(
            'openstack.common')

        # This is the naive extension implementation referred to in
        # blueprint 'client-extensions'
        # Extension modules can register their commands in an
        # 'openstack.extension' entry point group:
        # entry_points={
        #     'openstack.extension': [
        #         'list_repo=qaz.github.repo:ListRepo',
        #         'show_repo=qaz.github.repo:ShowRepo',
        #     ],
        # }
        self.command_manager.add_command_group(
            'openstack.extension')
        # call InitializeXxx() here
        # set up additional clients to stuff in to client_manager??

        # Handle deferred help and exit
        self.print_help_if_requested()

        self.client_manager = clientmanager.ClientManager(
            cli_options=self.cloud,
            verify=self.verify,
            api_version=self.api_version,
            pw_func=prompt_for_password,
        )

    def prepare_to_run_command(self, cmd):
        """Set up auth and API versions"""
        self.log.info(
            'command: %s -> %s.%s',
            getattr(cmd, 'cmd_name', '<none>'),
            cmd.__class__.__module__,
            cmd.__class__.__name__,
        )
        if cmd.auth_required:
            # Trigger the Identity client to initialize
            self.client_manager.auth_ref
        return

    def clean_up(self, cmd, result, err):
        self.log.debug('clean_up %s: %s', cmd.__class__.__name__, err or '')

        # Process collected timing data
        if self.options.timing:
            # Get session data
            self.timing_data.extend(
                self.client_manager.session.get_timings(),
            )

            # Use the Timing pseudo-command to generate the output
            tcmd = timing.Timing(self, self.options)
            tparser = tcmd.get_parser('Timing')

            # If anything other than prettytable is specified, force csv
            format = 'table'
            # Check the formatter used in the actual command
            if hasattr(cmd, 'formatter') \
                    and cmd.formatter != cmd._formatter_plugins['table'].obj:
                format = 'csv'

            sys.stdout.write('\n')
            targs = tparser.parse_args(['-f', format])
            tcmd.run(targs)


def main(argv=sys.argv[1:]):
    return OpenStackShell().run(argv)

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))