import sys
from unittest import mock
from unittest.mock import MagicMock

from test_utils import CharmTestCase

# python-apt is not installed as part of test-requirements but is imported by
# some charmhelpers modules so create a fake import.
sys.modules['apt'] = MagicMock()
sys.modules['apt_pkg'] = MagicMock()

import actions


class PauseTestCase(CharmTestCase):

    def setUp(self):
        super(PauseTestCase, self).setUp(
            actions, ["pause_unit_helper",
                      "charmhelpers.core.hookenv.log",
                      "charmhelpers.core.hookenv.status_set",
                      "charmhelpers.core.hookenv.config"])
        self.patch_object(None, "actions.register_configs",
                          name="register_configs",
                          return_value='test-config')

    def test_pauses_services(self):
        actions.pause([])
        self.pause_unit_helper.assert_called_once_with('test-config')


class ResumeTestCase(CharmTestCase):

    def setUp(self):
        super(ResumeTestCase, self).setUp(
            actions, ["resume_unit_helper",
                      "charmhelpers.core.hookenv.log",
                      "charmhelpers.core.hookenv.status_set",
                      "charmhelpers.core.hookenv.config"])
        self.patch_object(None, "actions.register_configs",
                          name="register_configs",
                          return_value='test-config')

    def test_resumes_services(self):
        actions.resume([])
        self.resume_unit_helper.assert_called_once_with('test-config')


class MainTestCase(CharmTestCase):

    def setUp(self):
        super(MainTestCase, self).setUp(actions, ["action_fail"])

    def test_invokes_action(self):
        dummy_calls = []

        def dummy_action(args):
            dummy_calls.append(True)

        with mock.patch.dict(actions.ACTIONS, {"foo": dummy_action}):
            actions.main(["foo"])
        self.assertEqual(dummy_calls, [True])

    def test_unknown_action(self):
        """Unknown actions aren't a traceback."""
        exit_string = actions.main(["foo"])
        self.assertEqual("Action foo undefined", exit_string)

    def test_failing_action(self):
        """Actions which traceback trigger action_fail() calls."""
        dummy_calls = []

        self.action_fail.side_effect = dummy_calls.append

        def dummy_action(args):
            raise ValueError("uh oh")

        with mock.patch.dict(actions.ACTIONS, {"foo": dummy_action}):
            actions.main(["foo"])
        self.assertEqual(dummy_calls, ["Action foo failed: uh oh"])