# Copyright (C) 2013 Yahoo! Inc.
# 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.

import argparse
from io import StringIO
import logging
import os
import re
import sys
from unittest import mock

import fixtures
from keystoneauth1 import session
import testtools
from testtools import matchers

from neutronclient.common import clientmanager
from neutronclient.neutron.v2_0 import network
from neutronclient import shell as openstack_shell


DEFAULT_USERNAME = 'username'
DEFAULT_PASSWORD = 'password'
DEFAULT_TENANT_ID = 'tenant_id'
DEFAULT_TENANT_NAME = 'tenant_name'
DEFAULT_AUTH_URL = 'http://127.0.0.1:5000/v2.0/'
DEFAULT_TOKEN = '3bcc3d3a03f44e3d8377f9247b0ad155'
DEFAULT_URL = 'http://quantum.example.org:9696/'
DEFAULT_REGION = 'regionOne'
DEFAULT_ENDPOINT_TYPE = 'public'
DEFAULT_API_VERSION = '2.0'
DEFAULT_SERVICE_TYPE = 'network'
DEFAULT_SERVICE_NAME = 'neutron'
DEFAULT_RETRIES = 3
DEFAULT_TIMEOUT = 3.0


class ShellTest(testtools.TestCase):

    FAKE_ENV = {
        'OS_USERNAME': DEFAULT_USERNAME,
        'OS_PASSWORD': DEFAULT_PASSWORD,
        'OS_TENANT_ID': DEFAULT_TENANT_ID,
        'OS_TENANT_NAME': DEFAULT_TENANT_NAME,
        'OS_AUTH_URL': DEFAULT_AUTH_URL,
        'OS_REGION_NAME': None,
        'HTTP_PROXY': None,
        'http_proxy': None,
    }

    # Patch os.environ to avoid required auth info.
    def setUp(self):
        super(ShellTest, self).setUp()
        for var in self.FAKE_ENV:
            self.useFixture(
                fixtures.EnvironmentVariable(
                    var, self.FAKE_ENV[var]))

    def shell(self, argstr, check=False, expected_val=0):
        # expected_val is the expected return value after executing
        # the command in NeutronShell
        orig = (sys.stdout, sys.stderr)
        clean_env = {}
        _old_env, os.environ = os.environ, clean_env.copy()
        try:
            sys.stdout = StringIO()
            sys.stderr = StringIO()
            _shell = openstack_shell.NeutronShell('2.0')
            _shell.run(argstr.split())
        except SystemExit:
            exc_type, exc_value, exc_traceback = sys.exc_info()
            self.assertEqual(expected_val, exc_value.code)
        finally:
            stdout = sys.stdout.getvalue()
            stderr = sys.stderr.getvalue()
            sys.stdout.close()
            sys.stderr.close()
            sys.stdout, sys.stderr = orig
            os.environ = _old_env
        return stdout, stderr

    def test_run_unknown_command(self):
        self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
        stdout, stderr = self.shell('fake', check=True)
        self.assertFalse(stdout)
        self.assertIn("Unknown command ['fake']", stderr.strip())

    def test_help(self):
        required = 'usage:'
        help_text, stderr = self.shell('help')
        self.assertThat(
            help_text,
            matchers.MatchesRegex(required))

    def test_bash_completion(self):
        required = '.*os_user_domain_id.*'
        bash_completion, stderr = self.shell('bash-completion')
        self.assertThat(
            bash_completion,
            matchers.MatchesRegex(required))

    def test_help_on_subcommand(self):
        required = [
            '.*?^usage: .* quota-list']
        stdout, stderr = self.shell('help quota-list')
        for r in required:
            self.assertThat(
                stdout,
                matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_help_command(self):
        required = 'usage:'
        help_text, stderr = self.shell('help network-create')
        self.assertThat(
            help_text,
            matchers.MatchesRegex(required))

    def test_bash_completion_in_outputs_of_help_command(self):
        help_text, stderr = self.shell('help')
        completion_cmd = "bash-completion"
        completion_help_str = ("Prints all of the commands and options "
                               "for bash-completion.")
        self.assertIn(completion_cmd, help_text)
        self.assertIn(completion_help_str, help_text)

    def test_bash_completion_command(self):
        # just check we have some output
        required = [
            '.*--tenant_id',
            '.*help',
            '.*--dns-nameserver']
        help_text, stderr = self.shell('neutron bash-completion')
        for r in required:
            self.assertThat(help_text,
                            matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_build_option_parser(self):
        neutron_shell = openstack_shell.NeutronShell('2.0')
        result = neutron_shell.build_option_parser('descr', '2.0')
        self.assertIsInstance(result, argparse.ArgumentParser)

    @mock.patch.object(openstack_shell.NeutronShell, 'run')
    def test_main_with_unicode(self, fake_shell):
        unicode_text = u'\u7f51\u7edc'
        argv = ['net-list', unicode_text, unicode_text]
        fake_shell.return_value = 0
        ret = openstack_shell.main(argv=argv)
        fake_shell.assert_called_once_with([u'net-list', unicode_text,
                                           unicode_text])
        self.assertEqual(0, ret)

    def test_endpoint_option(self):
        shell = openstack_shell.NeutronShell('2.0')
        parser = shell.build_option_parser('descr', '2.0')

        # Neither $OS_ENDPOINT_TYPE nor --os-endpoint-type
        namespace = parser.parse_args([])
        self.assertEqual('public', namespace.os_endpoint_type)

        # --endpoint-type but not $OS_ENDPOINT_TYPE
        namespace = parser.parse_args(['--os-endpoint-type=admin'])
        self.assertEqual('admin', namespace.os_endpoint_type)

    def test_endpoint_environment_variable(self):
        fixture = fixtures.EnvironmentVariable("OS_ENDPOINT_TYPE",
                                               "public")
        self.useFixture(fixture)

        shell = openstack_shell.NeutronShell('2.0')
        parser = shell.build_option_parser('descr', '2.0')

        # $OS_ENDPOINT_TYPE but not --endpoint-type
        namespace = parser.parse_args([])
        self.assertEqual("public", namespace.os_endpoint_type)

        # --endpoint-type and $OS_ENDPOINT_TYPE
        namespace = parser.parse_args(['--endpoint-type=admin'])
        self.assertEqual('admin', namespace.endpoint_type)

    def test_timeout_option(self):
        shell = openstack_shell.NeutronShell('2.0')
        parser = shell.build_option_parser('descr', '2.0')

        # Neither $OS_ENDPOINT_TYPE nor --endpoint-type
        namespace = parser.parse_args([])
        self.assertIsNone(namespace.http_timeout)

        # --endpoint-type but not $OS_ENDPOINT_TYPE
        namespace = parser.parse_args(['--http-timeout=50'])
        self.assertEqual(50, namespace.http_timeout)

    def test_timeout_environment_variable(self):
        fixture = fixtures.EnvironmentVariable("OS_NETWORK_TIMEOUT",
                                               "50")
        self.useFixture(fixture)

        shell = openstack_shell.NeutronShell('2.0')
        parser = shell.build_option_parser('descr', '2.0')

        namespace = parser.parse_args([])
        self.assertEqual(50, namespace.http_timeout)

    def test_run_incomplete_command(self):
        self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
        cmd = (
            '--os-username test --os-password test --os-project-id test '
            '--os-auth-strategy keystone --os-auth-url '
            '%s port-create' %
            DEFAULT_AUTH_URL)
        stdout, stderr = self.shell(cmd, check=True, expected_val=2)
        search_str = "Try 'neutron help port-create' for more information"
        self.assertTrue(any(search_str in string for string
                            in stderr.split('\n')))

    def _test_authenticate_user(self, expect_verify, expect_insecure,
                                **options):
        base_options = {'os_cloud': None,
                        'http_timeout': DEFAULT_TIMEOUT,
                        'region_name': DEFAULT_REGION,
                        'network_service_name': DEFAULT_SERVICE_NAME,
                        'neutron_service_type': DEFAULT_SERVICE_TYPE}

        options.update(base_options)
        if options.get('os_token'):
            options.update({'auth_type': 'token'})
            options.update({'os_token': 'token', 'os_url': 'url'})
        else:
            options.update({'os_token': None, 'os_url': None})

        with mock.patch.object(openstack_shell.NeutronShell,
                               'run_subcommand'), \
                mock.patch.object(session, 'Session') as session_mock, \
                mock.patch.object(clientmanager, 'ClientManager') as cmgr_mock:

            shell = openstack_shell.NeutronShell(DEFAULT_API_VERSION)
            shell.options = mock.Mock(spec=options.keys())
            for k, v in options.items():
                setattr(shell.options, k, v)
            shell.options.os_endpoint_type = DEFAULT_ENDPOINT_TYPE
            shell.options.retries = DEFAULT_RETRIES

            if not (options.get('os_token') and options.get('os_url')):
                auth = mock.ANY
                auth_session = mock.sentinel.session
                session_mock.return_value = auth_session
            else:
                auth = None
                auth_session = None

            shell.authenticate_user()

        if not (options.get('os_token') and options.get('os_url')):
            session_mock.assert_called_once_with(
                auth=mock.ANY, verify=expect_verify,
                cert=options.get('cert'),
                timeout=DEFAULT_TIMEOUT)
        else:
            self.assertFalse(session_mock.called)

        cmgr_mock.assert_called_once_with(
            retries=DEFAULT_RETRIES,
            raise_errors=False,
            session=auth_session,
            url=options.get('os_url'),
            token=options.get('os_token'),
            region_name=DEFAULT_REGION,
            api_version=DEFAULT_API_VERSION,
            service_type=DEFAULT_SERVICE_TYPE,
            service_name=DEFAULT_SERVICE_NAME,
            endpoint_type=DEFAULT_ENDPOINT_TYPE,
            auth=auth,
            insecure=expect_insecure,
            log_credentials=True)

    def test_authenticate_secure_with_cacert_with_cert(self):
        self._test_authenticate_user(
            insecure=False, cacert='cacert', cert='cert',
            expect_verify='cacert', expect_insecure=False)

    def test_authenticate_secure_with_cacert_with_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=False, cacert='cacert', cert='cert',
            expect_verify='cacert', expect_insecure=False)

    def test_authenticate_insecure_with_cacert_with_cert(self):
        self._test_authenticate_user(
            insecure=True, cacert='cacert', cert='cert',
            expect_verify=False, expect_insecure=True)

    def test_authenticate_insecure_with_cacert_with_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=True, cacert='cacert', cert='cert',
            expect_verify=False, expect_insecure=True)

    def test_authenticate_secure_without_cacert_with_cert(self):
        self._test_authenticate_user(
            insecure=False, cert='cert',
            expect_verify=True, expect_insecure=False)

    def test_authenticate_secure_without_cacert_with_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=False, cert='cert',
            expect_verify=True, expect_insecure=False)

    def test_authenticate_insecure_without_cacert_with_cert(self):
        self._test_authenticate_user(
            insecure=True, cert='cert',
            expect_verify=False, expect_insecure=True)

    def test_authenticate_insecure_without_cacert_with_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=True, cert='cert',
            expect_verify=False, expect_insecure=True)

    def test_authenticate_secure_with_cacert_without_cert(self):
        self._test_authenticate_user(
            insecure=False, cacert='cacert',
            expect_verify='cacert', expect_insecure=False)

    def test_authenticate_secure_with_cacert_without_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=False, cacert='cacert',
            expect_verify='cacert', expect_insecure=False)

    def test_authenticate_insecure_with_cacert_without_cert(self):
        self._test_authenticate_user(
            insecure=True, cacert='cacert',
            expect_verify=False, expect_insecure=True)

    def test_authenticate_insecure_with_cacert_without_cert_with_token(self):
        self._test_authenticate_user(
            os_token='token',
            insecure=True, cacert='cacert',
            expect_verify=False, expect_insecure=True)

    def test_commands_dict_populated(self):
        # neutron.shell.COMMANDS is populated once NeutronShell is initialized.
        # To check COMMANDS during NeutronShell initialization,
        # reset COMMANDS to some dummy value before calling NeutronShell().
        self.useFixture(fixtures.MockPatchObject(openstack_shell,
                                                 'COMMANDS', None))
        openstack_shell.NeutronShell('2.0')
        self.assertLessEqual(
            {'net-create': network.CreateNetwork,
             'net-delete': network.DeleteNetwork,
             'net-list': network.ListNetwork,
             'net-show': network.ShowNetwork,
             'net-update': network.UpdateNetwork}.items(),
            openstack_shell.COMMANDS['2.0'].items())
