import os

from twisted.trial import unittest

from lbrynet import conf


class SettingsTest(unittest.TestCase):
    def setUp(self):
        os.environ['LBRY_TEST'] = 'test_string'

    def tearDown(self):
        del os.environ['LBRY_TEST']

    @staticmethod
    def get_mock_config_instance():
        settings = {'test': (str, '')}
        env = conf.Env(**settings)
        return conf.Config({}, settings, environment=env)

    def test_envvar_is_read(self):
        settings = self.get_mock_config_instance()
        self.assertEqual('test_string', settings['test'])

    def test_setting_can_be_overridden(self):
        settings = self.get_mock_config_instance()
        settings['test'] = 'my_override'
        self.assertEqual('my_override', settings['test'])

    def test_setting_can_be_updated(self):
        settings = self.get_mock_config_instance()
        settings.update({'test': 'my_update'})
        self.assertEqual('my_update', settings['test'])

    def test_setting_is_in_dict(self):
        settings = self.get_mock_config_instance()
        setting_dict = settings.get_current_settings_dict()
        self.assertEqual({'test': 'test_string'}, setting_dict)

    def test_invalid_setting_raises_exception(self):
        settings = self.get_mock_config_instance()
        self.assertRaises(AssertionError, settings.set, 'invalid_name', 123)

    def test_invalid_data_type_raises_exception(self):
        settings = self.get_mock_config_instance()
        self.assertIsNone(settings.set('test', 123))
        self.assertRaises(AssertionError, settings.set, 'test', 123, ('fake_data_type',))

    def test_setting_precedence(self):
        settings = self.get_mock_config_instance()
        settings.set('test', 'cli_test_string', data_types=(conf.TYPE_CLI,))
        self.assertEqual('cli_test_string', settings['test'])
        settings.set('test', 'this_should_not_take_precedence', data_types=(conf.TYPE_ENV,))
        self.assertEqual('cli_test_string', settings['test'])
        settings.set('test', 'runtime_takes_precedence', data_types=(conf.TYPE_RUNTIME,))
        self.assertEqual('runtime_takes_precedence', settings['test'])