import cStringIO
import re
import sys

import fixtures
import mock
from testtools import matchers

import novaclient.client
from novaclient import exceptions
import novaclient.shell
from tests import utils

FAKE_ENV = {'OS_USERNAME': 'username',
            'OS_PASSWORD': 'password',
            'OS_TENANT_NAME': 'tenant_name',
            'OS_AUTH_URL': 'http://no.where'}


class ShellTest(utils.TestCase):

    def make_env(self, exclude=None):
        for var, val in FAKE_ENV.items():
            if var == exclude:
                continue
            self.useFixture(fixtures.EnvironmentVariable(var, val))

    def setUp(self):
        super(ShellTest, self).setUp()
        self.useFixture(fixtures.MonkeyPatch(
                        'novaclient.client.get_client_class',
                        mock.MagicMock))
        self.nc_util = mock.patch('novaclient.utils.isunauthenticated').start()
        self.nc_util.return_value = False

    def shell(self, argstr, exitcodes=(0,)):
        orig = sys.stdout
        orig_stderr = sys.stderr
        try:
            sys.stdout = cStringIO.StringIO()
            sys.stderr = cStringIO.StringIO()
            _shell = novaclient.shell.OpenStackComputeShell()
            _shell.main(argstr.split())
        except SystemExit:
            exc_type, exc_value, exc_traceback = sys.exc_info()
            self.assertIn(exc_value.code, exitcodes)
        finally:
            stdout = sys.stdout.getvalue()
            sys.stdout.close()
            sys.stdout = orig
            stderr = sys.stderr.getvalue()
            sys.stderr.close()
            sys.stderr = orig_stderr
        return (stdout, stderr)

    def test_help_unknown_command(self):
        self.assertRaises(exceptions.CommandError, self.shell, 'help foofoo')

    def test_invalid_timeout(self):
        for f in [0, -1, -10]:
            cmd_text = '--timeout %s' % (f)
            stdout, stderr = self.shell(cmd_text, exitcodes=[0, 2])
            required = [
                'argument --timeout: %s must be greater than 0' % (f),
            ]
            for r in required:
                self.assertIn(r, stderr)

    def test_help(self):
        required = [
            '.*?^usage: ',
            '.*?^\s+root-password\s+Change the root password',
            '.*?^See "nova help COMMAND" for help on a specific command',
        ]
        stdout, stderr = self.shell('help')
        for r in required:
            self.assertThat((stdout + stderr),
                            matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_help_on_subcommand(self):
        required = [
            '.*?^usage: nova root-password',
            '.*?^Change the root password',
            '.*?^Positional arguments:',
        ]
        stdout, stderr = self.shell('help root-password')
        for r in required:
            self.assertThat((stdout + stderr),
                            matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_help_no_options(self):
        required = [
            '.*?^usage: ',
            '.*?^\s+root-password\s+Change the root password',
            '.*?^See "nova help COMMAND" for help on a specific command',
        ]
        stdout, stderr = self.shell('')
        for r in required:
            self.assertThat((stdout + stderr),
                            matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_bash_completion(self):
        stdout, stderr = self.shell('bash-completion')
        # just check we have some output
        required = ['--matching help secgroup-delete-rule --priority']
        for r in required:
            self.assertThat((stdout + stderr),
                            matchers.MatchesRegex(r, re.DOTALL | re.MULTILINE))

    def test_no_username(self):
        required = ('You must provide a username'
                    ' via either --os-username or env[OS_USERNAME]',)
        self.make_env(exclude='OS_USERNAME')
        try:
            self.shell('list')
        except exceptions.CommandError, message:
            self.assertEqual(required, message.args)
        else:
            self.fail('CommandError not raised')

    def test_no_tenant_name(self):
        required = ('You must provide a tenant name'
                    ' via either --os-tenant-name or env[OS_TENANT_NAME]',)
        self.make_env(exclude='OS_TENANT_NAME')
        try:
            self.shell('list')
        except exceptions.CommandError, message:
            self.assertEqual(required, message.args)
        else:
            self.fail('CommandError not raised')

    def test_no_auth_url(self):
        required = ('You must provide an auth url'
                    ' via either --os-auth-url or env[OS_AUTH_URL] or'
                    ' specify an auth_system which defines a default url'
                    ' with --os-auth-system or env[OS_AUTH_SYSTEM',)
        self.make_env(exclude='OS_AUTH_URL')
        try:
            self.shell('list')
        except exceptions.CommandError, message:
            self.assertEqual(required, message.args)
        else:
            self.fail('CommandError not raised')

    @mock.patch('sys.stdin', side_effect=mock.MagicMock)
    @mock.patch('getpass.getpass', return_value='password')
    def test_password(self, mock_getpass, mock_stdin):
        self.make_env(exclude='OS_PASSWORD')
        stdout, stderr = self.shell('list')
        self.assertEqual((stdout + stderr), '\n')

    @mock.patch('sys.stdin', side_effect=mock.MagicMock)
    @mock.patch('getpass.getpass', side_effect=EOFError)
    def test_no_password(self, mock_getpass, mock_stdin):
        required = ('Expecting a password provided'
                    ' via either --os-password, env[OS_PASSWORD],'
                    ' or prompted response',)
        self.make_env(exclude='OS_PASSWORD')
        try:
            self.shell('list')
        except exceptions.CommandError, message:
            self.assertEqual(required, message.args)
        else:
            self.fail('CommandError not raised')