#  Copyright 2014 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 mock

from nova import test
from nova.virt.hyperv import constants
from nova.virt.hyperv import pathutils


class PathUtilsTestCase(test.NoDBTestCase):
    """Unit tests for the Hyper-V PathUtils class."""

    def setUp(self):
        self.fake_instance_dir = 'C:/fake_instance_dir'
        self.fake_instance_name = 'fake_instance_name'
        self._pathutils = pathutils.PathUtils()
        super(PathUtilsTestCase, self).setUp()

    def _mock_lookup_configdrive_path(self, ext):
        self._pathutils.get_instance_dir = mock.MagicMock(
            return_value=self.fake_instance_dir)

        def mock_exists(*args, **kwargs):
            path = args[0]
            return True if path[(path.rfind('.') + 1):] == ext else False
        self._pathutils.exists = mock_exists
        configdrive_path = self._pathutils.lookup_configdrive_path(
            self.fake_instance_name)
        return configdrive_path

    def test_lookup_configdrive_path(self):
        for format_ext in constants.DISK_FORMAT_MAP:
            configdrive_path = self._mock_lookup_configdrive_path(format_ext)
            self.assertEqual(configdrive_path,
                             self.fake_instance_dir + '/configdrive.' +
                             format_ext)

    def test_lookup_configdrive_path_non_exist(self):
        self._pathutils.get_instance_dir = mock.MagicMock(
            return_value=self.fake_instance_dir)
        self._pathutils.exists = mock.MagicMock(return_value=False)
        configdrive_path = self._pathutils.lookup_configdrive_path(
            self.fake_instance_name)
        self.assertIsNone(configdrive_path)
