#
# This file is part of FreedomBox.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
"""
Test module for utilities.
"""

import tempfile
from unittest.mock import MagicMock, Mock

import pytest
import ruamel.yaml
from django.test.client import RequestFactory

from plinth.utils import YAMLFile, is_user_admin


class TestIsAdminUser:
    """Test class for is_user_admin utility."""

    @staticmethod
    @pytest.fixture(name='web_request')
    def fixture_web_request():
        """Setup each test case before execution."""
        web_request = RequestFactory().get('/plinth/mockapp')
        web_request.user = Mock()
        web_request.session = MagicMock()
        return web_request

    @staticmethod
    def test_is_false_for_anonymous_user(web_request):
        """Test anonymous user is reported as non-admin."""
        web_request.user = Mock()
        web_request.user.is_authenticated = False
        assert not is_user_admin(web_request)
        assert not is_user_admin(web_request, cached=True)

    @staticmethod
    def test_values_for_authenticated_users(web_request):
        """Test correct return values for authenticated users."""
        web_request.user.groups.filter().exists = Mock(return_value=False)
        assert not is_user_admin(web_request)
        web_request.user.groups.filter().exists = Mock(return_value=True)
        assert is_user_admin(web_request)

    @staticmethod
    def test_caching_of_values(web_request):
        """Test that caching of values for authenticate users."""
        session_mock = MagicMock()
        session_dict = {}
        session_mock.__setitem__.side_effect = session_dict.__setitem__
        session_mock.__getitem__.side_effect = session_dict.__getitem__
        session_mock.__contains__.side_effect = session_dict.__contains__
        web_request.session = session_mock

        mock = Mock(return_value=False)
        web_request.user.groups.filter().exists = mock
        assert not is_user_admin(web_request)
        mock.assert_called_once_with()
        session_mock.__setitem__.assert_called_once_with(
            'cache_user_is_admin', False)

        mock = Mock(return_value=False)
        web_request.user.groups.filter().exists = mock
        assert not is_user_admin(web_request, cached=True)
        mock.assert_not_called()
        session_mock.__getitem__.assert_called_once_with('cache_user_is_admin')

        mock = Mock(return_value=False)
        web_request.user.groups.filter().exists = mock
        assert not is_user_admin(web_request, cached=False)
        mock.assert_called_once_with()
        session_mock.__getitem__.assert_called_once_with('cache_user_is_admin')


class TestYAMLFileUtil:
    """Check updating YAML files"""

    kv_pair = {'key': 'value'}

    def test_update_empty_yaml_file(self):
        """
        Update an empty YAML file with content.
        """
        test_file = tempfile.NamedTemporaryFile()
        conf = {'property1': self.kv_pair}

        with YAMLFile(test_file.name) as file_conf:
            for key in conf:
                file_conf[key] = conf[key]

        with open(test_file.name, 'r') as retrieved_conf:
            assert retrieved_conf.read() == ruamel.yaml.round_trip_dump(conf)

    def test_update_non_empty_yaml_file(self):
        """
        Update a non-empty YAML file with modifications
        """
        test_file = tempfile.NamedTemporaryFile()

        with open(test_file.name, 'w') as conf_file:
            conf_file.write(
                ruamel.yaml.round_trip_dump({
                    'property1': self.kv_pair
                }))

        with YAMLFile(test_file.name) as file_conf:
            file_conf['property2'] = self.kv_pair

        with open(test_file.name, 'r') as retrieved_conf:
            file_conf = ruamel.yaml.round_trip_load(retrieved_conf)
            assert file_conf == {
                'property1': self.kv_pair,
                'property2': self.kv_pair
            }

    @staticmethod
    def test_context_exception():
        """Test that exception during update does not update file."""
        test_file = tempfile.NamedTemporaryFile()
        with pytest.raises(ValueError):
            with YAMLFile(test_file.name) as yaml_file:
                yaml_file['property1'] = 'value1'
                raise ValueError('Test')

        assert open(test_file.name, 'r').read() == ''