# 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 collections
import sys

from six import moves

from cinderclient import exceptions
from cinderclient import utils
from cinderclient import base
from cinderclient.tests import utils as test_utils

UUID = '8e8ec658-c7b0-4243-bdf8-6f7f2952c0d0'


class FakeResource(object):

    def __init__(self, _id, properties):
        self.id = _id
        try:
            self.name = properties['name']
        except KeyError:
            pass
        try:
            self.display_name = properties['display_name']
        except KeyError:
            pass


class FakeManager(base.ManagerWithFind):

    resource_class = FakeResource

    resources = [
        FakeResource('1234', {'name': 'entity_one'}),
        FakeResource(UUID, {'name': 'entity_two'}),
        FakeResource('4242', {'display_name': 'entity_three'}),
        FakeResource('5678', {'name': '9876'})
    ]

    def get(self, resource_id):
        for resource in self.resources:
            if resource.id == str(resource_id):
                return resource
        raise exceptions.NotFound(resource_id)

    def list(self, search_opts):
        return self.resources


class FindResourceTestCase(test_utils.TestCase):

    def setUp(self):
        super(FindResourceTestCase, self).setUp()
        self.manager = FakeManager(None)

    def test_find_none(self):
        self.assertRaises(exceptions.CommandError,
                          utils.find_resource,
                          self.manager,
                          'asdf')

    def test_find_by_integer_id(self):
        output = utils.find_resource(self.manager, 1234)
        self.assertEqual(output, self.manager.get('1234'))

    def test_find_by_str_id(self):
        output = utils.find_resource(self.manager, '1234')
        self.assertEqual(output, self.manager.get('1234'))

    def test_find_by_uuid(self):
        output = utils.find_resource(self.manager, UUID)
        self.assertEqual(output, self.manager.get(UUID))

    def test_find_by_str_name(self):
        output = utils.find_resource(self.manager, 'entity_one')
        self.assertEqual(output, self.manager.get('1234'))

    def test_find_by_str_displayname(self):
        output = utils.find_resource(self.manager, 'entity_three')
        self.assertEqual(output, self.manager.get('4242'))


class CaptureStdout(object):
    """Context manager for capturing stdout from statments in its's block."""
    def __enter__(self):
        self.real_stdout = sys.stdout
        self.stringio = moves.StringIO()
        sys.stdout = self.stringio
        return self

    def __exit__(self, *args):
        sys.stdout = self.real_stdout
        self.stringio.seek(0)
        self.read = self.stringio.read


class PrintListTestCase(test_utils.TestCase):

    def test_print_list_with_list(self):
        Row = collections.namedtuple('Row', ['a', 'b'])
        to_print = [Row(a=1, b=2), Row(a=3, b=4)]
        with CaptureStdout() as cso:
            utils.print_list(to_print, ['a', 'b'])
        self.assertEqual(cso.read(), """\
+---+---+
| a | b |
+---+---+
| 1 | 2 |
| 3 | 4 |
+---+---+
""")

    def test_print_list_with_generator(self):
        Row = collections.namedtuple('Row', ['a', 'b'])

        def gen_rows():
            for row in [Row(a=1, b=2), Row(a=3, b=4)]:
                yield row
        with CaptureStdout() as cso:
            utils.print_list(gen_rows(), ['a', 'b'])
        self.assertEqual(cso.read(), """\
+---+---+
| a | b |
+---+---+
| 1 | 2 |
| 3 | 4 |
+---+---+
""")
