# Copyright 2015 Canonical Ltd.
# This file is part of cloud-init.  See LICENCE file for license information.
#
# vi: ts=4 expandtab

from cloudinit import reporting

from .helpers import (mock, TestCase)


def _fake_registry():
    return mock.Mock(registered_items={'a': mock.MagicMock(),
                                       'b': mock.MagicMock()})


class TestReportStartEvent(TestCase):

    @mock.patch('cloudinit.reporting.instantiated_handler_registry',
                new_callable=_fake_registry)
    def test_report_start_event_passes_something_with_as_string_to_handlers(
            self, instantiated_handler_registry):
        event_name, event_description = 'my_test_event', 'my description'
        reporting.report_start_event(event_name, event_description)
        expected_string_representation = ': '.join(
            ['start', event_name, event_description])
        for _, handler in (
                instantiated_handler_registry.registered_items.items()):
            self.assertEqual(1, handler.publish_event.call_count)
            event = handler.publish_event.call_args[0][0]
            self.assertEqual(expected_string_representation, event.as_string())


class TestReportFinishEvent(TestCase):

    def _report_finish_event(self, result=reporting.status.SUCCESS):
        event_name, event_description = 'my_test_event', 'my description'
        reporting.report_finish_event(
            event_name, event_description, result=result)
        return event_name, event_description

    def assertHandlersPassedObjectWithAsString(
            self, handlers, expected_as_string):
        for _, handler in handlers.items():
            self.assertEqual(1, handler.publish_event.call_count)
            event = handler.publish_event.call_args[0][0]
            self.assertEqual(expected_as_string, event.as_string())

    @mock.patch('cloudinit.reporting.instantiated_handler_registry',
                new_callable=_fake_registry)
    def test_report_finish_event_passes_something_with_as_string_to_handlers(
            self, instantiated_handler_registry):
        event_name, event_description = self._report_finish_event()
        expected_string_representation = ': '.join(
            ['finish', event_name, reporting.status.SUCCESS, event_description])
        self.assertHandlersPassedObjectWithAsString(
            instantiated_handler_registry.registered_items,
            expected_string_representation)

    @mock.patch('cloudinit.reporting.instantiated_handler_registry',
                new_callable=_fake_registry)
    def test_reporting_successful_finish_has_sensible_string_repr(
            self, instantiated_handler_registry):
        event_name, event_description = self._report_finish_event(
            result=reporting.status.SUCCESS)
        expected_string_representation = ': '.join(
            ['finish', event_name, reporting.status.SUCCESS, event_description])
        self.assertHandlersPassedObjectWithAsString(
            instantiated_handler_registry.registered_items,
            expected_string_representation)

    @mock.patch('cloudinit.reporting.instantiated_handler_registry',
                new_callable=_fake_registry)
    def test_reporting_unsuccessful_finish_has_sensible_string_repr(
            self, instantiated_handler_registry):
        event_name, event_description = self._report_finish_event(
            result=reporting.status.FAIL)
        expected_string_representation = ': '.join(
            ['finish', event_name, reporting.status.FAIL, event_description])
        self.assertHandlersPassedObjectWithAsString(
            instantiated_handler_registry.registered_items,
            expected_string_representation)


class TestReportingEvent(TestCase):

    def test_as_string(self):
        event_type, name, description = 'test_type', 'test_name', 'test_desc'
        event = reporting.ReportingEvent(event_type, name, description)
        expected_string_representation = ': '.join(
            [event_type, name, description])
        self.assertEqual(expected_string_representation, event.as_string())


class TestReportingHandler(TestCase):

    def test_no_default_publish_event_implementation(self):
        self.assertRaises(NotImplementedError,
                          reporting.handlers.ReportingHandler().publish_event,
                          None)


class TestLogHandler(TestCase):

    @mock.patch.object(reporting.handlers.logging, 'getLogger')
    def test_appropriate_logger_used(self, getLogger):
        event_type, event_name = 'test_type', 'test_name'
        event = reporting.ReportingEvent(event_type, event_name, 'description')
        reporting.handlers.LogHandler().publish_event(event)
        self.assertEqual(
            [mock.call(
                'cloudinit.reporting.{0}.{1}'.format(event_type, event_name))],
            getLogger.call_args_list)

    @mock.patch.object(reporting.handlers.logging, 'getLogger')
    def test_single_log_message_at_info_published(self, getLogger):
        event = reporting.ReportingEvent('type', 'name', 'description')
        reporting.handlers.LogHandler().publish_event(event)
        self.assertEqual(1, getLogger.return_value.info.call_count)

    @mock.patch.object(reporting.handlers.logging, 'getLogger')
    def test_log_message_uses_event_as_string(self, getLogger):
        event = reporting.ReportingEvent('type', 'name', 'description')
        reporting.handlers.LogHandler().publish_event(event)
        self.assertIn(event.as_string(),
                      getLogger.return_value.info.call_args[0][0])


class TestDefaultRegisteredHandler(TestCase):

    def test_log_handler_registered_by_default(self):
        registered_items = (
            reporting.instantiated_handler_registry.registered_items)
        for _, item in registered_items.items():
            if isinstance(item, reporting.handlers.LogHandler):
                break
        else:
            self.fail('No reporting LogHandler registered by default.')


class TestReportingConfiguration(TestCase):

    @mock.patch.object(reporting, 'instantiated_handler_registry')
    def test_empty_configuration_doesnt_add_handlers(
            self, instantiated_handler_registry):
        reporting.add_configuration({})
        self.assertEqual(
            0, instantiated_handler_registry.register_item.call_count)

    @mock.patch.object(
        reporting, 'instantiated_handler_registry', reporting.DictRegistry())
    @mock.patch.object(reporting, 'available_handlers')
    def test_looks_up_handler_by_type_and_adds_it(self, available_handlers):
        handler_type_name = 'test_handler'
        handler_cls = mock.Mock()
        available_handlers.registered_items = {handler_type_name: handler_cls}
        handler_name = 'my_test_handler'
        reporting.add_configuration(
            {handler_name: {'type': handler_type_name}})
        self.assertEqual(
            {handler_name: handler_cls.return_value},
            reporting.instantiated_handler_registry.registered_items)

    @mock.patch.object(
        reporting, 'instantiated_handler_registry', reporting.DictRegistry())
    @mock.patch.object(reporting, 'available_handlers')
    def test_uses_non_type_parts_of_config_dict_as_kwargs(
            self, available_handlers):
        handler_type_name = 'test_handler'
        handler_cls = mock.Mock()
        available_handlers.registered_items = {handler_type_name: handler_cls}
        extra_kwargs = {'foo': 'bar', 'bar': 'baz'}
        handler_config = extra_kwargs.copy()
        handler_config.update({'type': handler_type_name})
        handler_name = 'my_test_handler'
        reporting.add_configuration({handler_name: handler_config})
        self.assertEqual(
            handler_cls.return_value,
            reporting.instantiated_handler_registry.registered_items[
                handler_name])
        self.assertEqual([mock.call(**extra_kwargs)],
                         handler_cls.call_args_list)

    @mock.patch.object(
        reporting, 'instantiated_handler_registry', reporting.DictRegistry())
    @mock.patch.object(reporting, 'available_handlers')
    def test_handler_config_not_modified(self, available_handlers):
        handler_type_name = 'test_handler'
        handler_cls = mock.Mock()
        available_handlers.registered_items = {handler_type_name: handler_cls}
        handler_config = {'type': handler_type_name, 'foo': 'bar'}
        expected_handler_config = handler_config.copy()
        reporting.add_configuration({'my_test_handler': handler_config})
        self.assertEqual(expected_handler_config, handler_config)