from __future__ import absolute_import, unicode_literals

from django.contrib.auth.models import User
from django.db import IntegrityError, transaction
from django.test import TestCase
from django.test.utils import override_settings
from django.utils import unittest

try:
    import line_profiler
except ImportError:
    line_profiler = None

from debug_toolbar.panels import profiling

from ..base import BaseTestCase
from ..views import regular_view


@override_settings(DEBUG_TOOLBAR_PANELS=['debug_toolbar.panels.profiling.ProfilingPanel'])
class ProfilingPanelTestCase(BaseTestCase):

    def setUp(self):
        super(ProfilingPanelTestCase, self).setUp()
        self.panel = self.toolbar.get_panel_by_id('ProfilingPanel')

    def _test_render_with_or_without_line_profiler(self):
        self.panel.process_view(self.request, regular_view, ('profiling',), {})
        self.panel.process_response(self.request, self.response)
        self.assertIn('func_list', self.panel.get_stats())
        self.assertIn('regular_view', self.panel.content())

    # These two tests fail randomly for a reason I don't understand.

    @unittest.expectedFailure
    @unittest.skipIf(line_profiler is None, "line_profiler isn't available")
    def test_render_with_line_profiler(self):
        self._test_render_with_or_without_line_profiler()

    @unittest.expectedFailure
    def test_without_line_profiler(self):
        _use_line_profiler = profiling.DJ_PROFILE_USE_LINE_PROFILER
        profiling.DJ_PROFILE_USE_LINE_PROFILER = False
        try:
            self._test_render_with_or_without_line_profiler()
        finally:
            profiling.DJ_PROFILE_USE_LINE_PROFILER = _use_line_profiler


@override_settings(DEBUG=True,
                   DEBUG_TOOLBAR_PANELS=['debug_toolbar.panels.profiling.ProfilingPanel'])
class ProfilingPanelIntegrationTestCase(TestCase):

    def test_view_executed_once(self):
        self.assertEqual(User.objects.count(), 0)

        response = self.client.get('/new_user/')
        self.assertContains(response, 'Profiling')
        self.assertEqual(User.objects.count(), 1)

        with self.assertRaises(IntegrityError):
            if hasattr(transaction, 'atomic'):      # Django >= 1.6
                with transaction.atomic():
                    response = self.client.get('/new_user/')
            else:
                response = self.client.get('/new_user/')
        self.assertEqual(User.objects.count(), 1)