#!/usr/bin/env python

# Copyright 2013 IBM Corp.
#
#    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.

import argparse
import os
import re
import sys
import traceback

from cliff import command
from oslo_log import log as logging
from oslo_serialization import jsonutils as json
from six import moves
from six.moves.urllib import parse as urlparse

from tempest import clients
from tempest.common import credentials_factory as credentials
from tempest import config
import tempest.lib.common.http


CONF = config.CONF
CONF_PARSER = None

LOG = logging.getLogger(__name__)


def _get_config_file():
    default_config_dir = os.path.join(os.path.abspath(
        os.path.dirname(os.path.dirname(os.path.dirname(__file__)))), "etc")
    default_config_file = "tempest.conf"

    conf_dir = os.environ.get('TEMPEST_CONFIG_DIR', default_config_dir)
    conf_file = os.environ.get('TEMPEST_CONFIG', default_config_file)
    path = os.path.join(conf_dir, conf_file)
    fd = open(path, 'r+')
    return fd


def change_option(option, group, value):
    if not CONF_PARSER.has_section(group):
        CONF_PARSER.add_section(group)
    CONF_PARSER.set(group, option, str(value))


def print_and_or_update(option, group, value, update):
    print('Config option %s in group %s should be changed to: %s'
          % (option, group, value))
    if update:
        change_option(option, group, value)


def contains_version(prefix, versions):
    return any([x for x in versions if x.startswith(prefix)])


def verify_glance_api_versions(os, update):
    # Check glance api versions
    _, versions = os.image_client.get_versions()
    if CONF.image_feature_enabled.api_v1 != contains_version('v1.', versions):
        print_and_or_update('api_v1', 'image-feature-enabled',
                            not CONF.image_feature_enabled.api_v1, update)
    if CONF.image_feature_enabled.api_v2 != contains_version('v2.', versions):
        print_and_or_update('api_v2', 'image-feature-enabled',
                            not CONF.image_feature_enabled.api_v2, update)


def _remove_version_project(url_path):
    # The regex matches strings like /v2.0, /v3/, /v2.1/project-id/
    return re.sub(r'/v\d+(\.\d+)?(/[^/]+)?', '', url_path)


def _get_unversioned_endpoint(base_url):
    endpoint_parts = urlparse.urlparse(base_url)
    new_path = _remove_version_project(endpoint_parts.path)
    endpoint_parts = endpoint_parts._replace(path=new_path)
    endpoint = urlparse.urlunparse(endpoint_parts)
    return endpoint


def _get_api_versions(os, service):
    client_dict = {
        'nova': os.servers_client,
        'keystone': os.identity_client,
        'cinder': os.volumes_client,
    }
    if service != 'keystone' and service != 'cinder':
        # Since keystone and cinder may be listening on a path,
        # do not remove the path.
        client_dict[service].skip_path()
    endpoint = _get_unversioned_endpoint(client_dict[service].base_url)

    http = tempest.lib.common.http.ClosingHttp(
        CONF.identity.disable_ssl_certificate_validation,
        CONF.identity.ca_certificates_file)

    __, body = http.request(endpoint, 'GET')
    client_dict[service].reset_path()
    try:
        body = json.loads(body)
    except ValueError:
        LOG.error(
            'Failed to get a JSON response from unversioned endpoint %s '
            '(versioned endpoint was %s). Response is:\n%s',
            endpoint, client_dict[service].base_url, body[:100])
        raise
    if service == 'keystone':
        versions = map(lambda x: x['id'], body['versions']['values'])
    else:
        versions = map(lambda x: x['id'], body['versions'])
    return list(versions)


def verify_keystone_api_versions(os, update):
    # Check keystone api versions
    versions = _get_api_versions(os, 'keystone')
    if (CONF.identity_feature_enabled.api_v2 !=
            contains_version('v2.', versions)):
        print_and_or_update('api_v2', 'identity-feature-enabled',
                            not CONF.identity_feature_enabled.api_v2, update)
    if (CONF.identity_feature_enabled.api_v3 !=
            contains_version('v3.', versions)):
        print_and_or_update('api_v3', 'identity-feature-enabled',
                            not CONF.identity_feature_enabled.api_v3, update)


def verify_cinder_api_versions(os, update):
    # Check cinder api versions
    versions = _get_api_versions(os, 'cinder')
    if (CONF.volume_feature_enabled.api_v1 !=
            contains_version('v1.', versions)):
        print_and_or_update('api_v1', 'volume-feature-enabled',
                            not CONF.volume_feature_enabled.api_v1, update)
    if (CONF.volume_feature_enabled.api_v2 !=
            contains_version('v2.', versions)):
        print_and_or_update('api_v2', 'volume-feature-enabled',
                            not CONF.volume_feature_enabled.api_v2, update)
    if (CONF.volume_feature_enabled.api_v3 !=
            contains_version('v3.', versions)):
        print_and_or_update('api_v3', 'volume-feature-enabled',
                            not CONF.volume_feature_enabled.api_v3, update)


def verify_api_versions(os, service, update):
    verify = {
        'cinder': verify_cinder_api_versions,
        'glance': verify_glance_api_versions,
        'keystone': verify_keystone_api_versions,
    }
    if service not in verify:
        return
    verify[service](os, update)


def get_extension_client(os, service):
    extensions_client = {
        'nova': os.extensions_client,
        'neutron': os.network_extensions_client,
        'swift': os.capabilities_client,
        # NOTE: Cinder v3 API is current and v2 and v1 are deprecated.
        # V3 extension API is the same as v2, so we reuse the v2 client
        # for v3 API also.
        'cinder': os.volumes_v2_extension_client,
    }

    if service not in extensions_client:
        print('No tempest extensions client for %s' % service)
        sys.exit(1)
    return extensions_client[service]


def get_enabled_extensions(service):
    extensions_options = {
        'nova': CONF.compute_feature_enabled.api_extensions,
        'cinder': CONF.volume_feature_enabled.api_extensions,
        'neutron': CONF.network_feature_enabled.api_extensions,
        'swift': CONF.object_storage_feature_enabled.discoverable_apis,
    }
    if service not in extensions_options:
        print('No supported extensions list option for %s' % service)
        sys.exit(1)
    return extensions_options[service]


def verify_extensions(os, service, results):
    extensions_client = get_extension_client(os, service)
    if service != 'swift':
        resp = extensions_client.list_extensions()
    else:
        __, resp = extensions_client.list_capabilities()
    # For Nova, Cinder and Neutron we use the alias name rather than the
    # 'name' field because the alias is considered to be the canonical
    # name.
    if isinstance(resp, dict):
        if service == 'swift':
            # Remove Swift general information from extensions list
            resp.pop('swift')
            extensions = resp.keys()
        else:
            extensions = map(lambda x: x['alias'], resp['extensions'])

    else:
        extensions = map(lambda x: x['alias'], resp)
    extensions = list(extensions)
    if not results.get(service):
        results[service] = {}
    extensions_opt = get_enabled_extensions(service)
    if extensions_opt[0] == 'all':
        results[service]['extensions'] = extensions
        return results
    # Verify that all configured extensions are actually enabled
    for extension in extensions_opt:
        results[service][extension] = extension in extensions
    # Verify that there aren't additional extensions enabled that aren't
    # specified in the config list
    for extension in extensions:
        if extension not in extensions_opt:
            results[service][extension] = False
    return results


def display_results(results, update, replace):
    update_dict = {
        'swift': 'object-storage-feature-enabled',
        'nova': 'compute-feature-enabled',
        'cinder': 'volume-feature-enabled',
        'neutron': 'network-feature-enabled',
    }
    for service in results:
        # If all extensions are specified as being enabled there is no way to
        # verify this so we just assume this to be true
        if results[service].get('extensions'):
            if replace:
                output_list = results[service].get('extensions')
            else:
                output_list = ['all']
        else:
            extension_list = get_enabled_extensions(service)
            output_list = []
            for extension in results[service]:
                if not results[service][extension]:
                    if extension in extension_list:
                        print("%s extension: %s should not be included in the "
                              "list of enabled extensions" % (service,
                                                              extension))
                    else:
                        print("%s extension: %s should be included in the list"
                              " of enabled extensions" % (service, extension))
                        output_list.append(extension)
                else:
                    output_list.append(extension)
        if update:
            # Sort List
            output_list.sort()
            # Convert list to a string
            output_string = ', '.join(output_list)
            if service == 'swift':
                change_option('discoverable_apis', update_dict[service],
                              output_string)
            else:
                change_option('api_extensions', update_dict[service],
                              output_string)


def check_service_availability(os, update):
    services = []
    avail_services = []
    codename_match = {
        'volume': 'cinder',
        'network': 'neutron',
        'image': 'glance',
        'object_storage': 'swift',
        'compute': 'nova',
        'orchestration': 'heat',
        'baremetal': 'ironic',
        'identity': 'keystone',
    }
    # Get catalog list for endpoints to use for validation
    _token, auth_data = os.auth_provider.get_auth()
    if os.auth_version == 'v2':
        catalog_key = 'serviceCatalog'
    else:
        catalog_key = 'catalog'
    for entry in auth_data[catalog_key]:
        services.append(entry['type'])
    # Pull all catalog types from config file and compare against endpoint list
    for cfgname in dir(CONF._config):
        cfg = getattr(CONF, cfgname)
        catalog_type = getattr(cfg, 'catalog_type', None)
        if not catalog_type:
            continue
        else:
            if cfgname == 'identity':
                # Keystone is a required service for tempest
                continue
            if catalog_type not in services:
                if getattr(CONF.service_available, codename_match[cfgname]):
                    print('Endpoint type %s not found either disable service '
                          '%s or fix the catalog_type in the config file' % (
                              catalog_type, codename_match[cfgname]))
                    if update:
                        change_option(codename_match[cfgname],
                                      'service_available', False)
            else:
                if not getattr(CONF.service_available,
                               codename_match[cfgname]):
                    print('Endpoint type %s is available, service %s should be'
                          ' set as available in the config file.' % (
                              catalog_type, codename_match[cfgname]))
                    if update:
                        change_option(codename_match[cfgname],
                                      'service_available', True)
                        # If we are going to enable this we should allow
                        # extension checks.
                        avail_services.append(codename_match[cfgname])
                else:
                    avail_services.append(codename_match[cfgname])
    return avail_services


def _parser_add_args(parser):
    parser.add_argument('-u', '--update', action='store_true',
                        help='Update the config file with results from api '
                             'queries. This assumes whatever is set in the '
                             'config file is incorrect. In the case of '
                             'endpoint checks where it could either be the '
                             'incorrect catalog type or the service available '
                             'option the service available option is assumed '
                             'to be incorrect and is thus changed')
    parser.add_argument('-o', '--output',
                        help="Output file to write an updated config file to. "
                             "This has to be a separate file from the "
                             "original config file. If one isn't specified "
                             "with -u the new config file will be printed to "
                             "STDOUT")
    parser.add_argument('-r', '--replace-ext', action='store_true',
                        help="If specified the all option will be replaced "
                             "with a full list of extensions")


def parse_args():
    parser = argparse.ArgumentParser()
    _parser_add_args(parser)
    opts = parser.parse_args()
    return opts


def main(opts=None):
    print('Running config verification...')
    if opts is None:
        print("Use of: 'verify-tempest-config' is deprecated, "
              "please use: 'tempest verify-config'")
        opts = parse_args()
    update = opts.update
    replace = opts.replace_ext
    global CONF_PARSER

    if update:
        conf_file = _get_config_file()
        CONF_PARSER = moves.configparser.ConfigParser()
        CONF_PARSER.optionxform = str
        CONF_PARSER.readfp(conf_file)

    # Indicate not to create network resources as part of getting credentials
    net_resources = {
        'network': False,
        'router': False,
        'subnet': False,
        'dhcp': False
    }
    icreds = credentials.get_credentials_provider(
        'verify_tempest_config', network_resources=net_resources)
    try:
        os = clients.Manager(icreds.get_primary_creds().credentials)
        services = check_service_availability(os, update)
        results = {}
        for service in ['nova', 'cinder', 'neutron', 'swift']:
            if service not in services:
                continue
            results = verify_extensions(os, service, results)

        # Verify API versions of all services in the keystone catalog and
        # keystone itself.
        services.append('keystone')
        for service in services:
            verify_api_versions(os, service, update)

        display_results(results, update, replace)
        if update:
            conf_file.close()
            if opts.output:
                with open(opts.output, 'w+') as outfile:
                    CONF_PARSER.write(outfile)
    finally:
        icreds.clear_creds()


class TempestVerifyConfig(command.Command):
    """Verify your current tempest configuration"""

    def get_parser(self, prog_name):
        parser = super(TempestVerifyConfig, self).get_parser(prog_name)
        _parser_add_args(parser)
        return parser

    def take_action(self, parsed_args):
        try:
            main(parsed_args)
        except Exception:
            LOG.exception("Failure verifying configuration.")
            traceback.print_exc()
            raise

if __name__ == "__main__":
    main()