from cloudinit import helpers
from cloudinit.sources.DataSourceCloudStack import DataSourceCloudStack
from ..helpers import TestCase

try:
    from unittest import mock
except ImportError:
    import mock
try:
    from contextlib import ExitStack
except ImportError:
    from contextlib2 import ExitStack


class TestCloudStackPasswordFetching(TestCase):

    def setUp(self):
        super(TestCloudStackPasswordFetching, self).setUp()
        self.patches = ExitStack()
        self.addCleanup(self.patches.close)
        mod_name = 'cloudinit.sources.DataSourceCloudStack'
        self.patches.enter_context(mock.patch('{0}.ec2'.format(mod_name)))
        self.patches.enter_context(mock.patch('{0}.uhelp'.format(mod_name)))

    def _set_password_server_response(self, response_string):
        http_client = mock.MagicMock()
        http_client.HTTPConnection.return_value.sock.recv.return_value = \
            response_string.encode('utf-8')
        self.patches.enter_context(
            mock.patch('cloudinit.sources.DataSourceCloudStack.http_client',
                       http_client))
        return http_client

    def test_empty_password_doesnt_create_config(self):
        self._set_password_server_response('')
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        ds.get_data()
        self.assertEqual({}, ds.get_config_obj())

    def test_saved_password_doesnt_create_config(self):
        self._set_password_server_response('saved_password')
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        ds.get_data()
        self.assertEqual({}, ds.get_config_obj())

    def test_password_sets_password(self):
        password = 'SekritSquirrel'
        self._set_password_server_response(password)
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        ds.get_data()
        self.assertEqual(password, ds.get_config_obj()['password'])

    def test_bad_request_doesnt_stop_ds_from_working(self):
        self._set_password_server_response('bad_request')
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        self.assertTrue(ds.get_data())

    def assertRequestTypesSent(self, http_client, expected_request_types):
        request_types = [
            kwargs['headers']['DomU_Request']
            for _, kwargs
            in http_client.HTTPConnection.return_value.request.call_args_list]
        self.assertEqual(expected_request_types, request_types)

    def test_valid_response_means_password_marked_as_saved(self):
        password = 'SekritSquirrel'
        http_client = self._set_password_server_response(password)
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        ds.get_data()
        self.assertRequestTypesSent(http_client,
                                    ['send_my_password', 'saved_password'])

    def _check_password_not_saved_for(self, response_string):
        http_client = self._set_password_server_response(response_string)
        ds = DataSourceCloudStack({}, None, helpers.Paths({}))
        ds.get_data()
        self.assertRequestTypesSent(http_client, ['send_my_password'])

    def test_password_not_saved_if_empty(self):
        self._check_password_not_saved_for('')

    def test_password_not_saved_if_already_saved(self):
        self._check_password_not_saved_for('saved_password')

    def test_password_not_saved_if_bad_request(self):
        self._check_password_not_saved_for('bad_request')