# -*- coding: utf-8 -*-
import sys
from django.core.urlresolvers import reverse
from django.test import TestCase

from helpdesk import settings
from helpdesk.tests.helpers import get_staff_user, reload_urlconf, User


class KBDisabledTestCase(TestCase):
    def setUp(self):
        self.HELPDESK_KB_ENABLED = settings.HELPDESK_KB_ENABLED
        if self.HELPDESK_KB_ENABLED:
            settings.HELPDESK_KB_ENABLED = False
            reload_urlconf()

    def tearDown(self):
        if self.HELPDESK_KB_ENABLED:
            settings.HELPDESK_KB_ENABLED = True
            reload_urlconf()

    def test_navigation(self):
        """Test proper rendering of navigation.html by accessing the dashboard"""
        from django.core.urlresolvers import NoReverseMatch

        self.client.login(username=get_staff_user().username, password='password')
        self.assertRaises(NoReverseMatch, reverse, 'helpdesk_kb_index')
        try:
            response = self.client.get(reverse('helpdesk_dashboard'))
        except NoReverseMatch, e:
            if 'helpdesk_kb_index' in e.message:
                self.fail("Please verify any unchecked references to helpdesk_kb_index (start with navigation.html)")
            else:
                raise
        else:
            self.assertEqual(response.status_code, 200)


class StaffUserTestCaseMixin(object):
    HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE = False
    HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK = None
    expected_login_template = 'admin/login.html'

    def setUp(self):
        self.old_settings = settings.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE, settings.HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK
        settings.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE = self.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE
        settings.HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK = self.HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK
        self.reload_views()

    def tearDown(self):
        settings.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE, settings.HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK = self.old_settings
        self.reload_views()

    def reload_views(self):
        try:
            reload(sys.modules['helpdesk.views.staff'])
            reload_urlconf()
        except KeyError:
            pass

    def test_anonymous_user(self):
        """Access to the dashboard always requires a login"""
        response = self.client.get(reverse('helpdesk_dashboard'), follow=True)
        self.assertTemplateUsed(response, self.expected_login_template)


class NonStaffUsersAllowedTestCase(StaffUserTestCaseMixin, TestCase):
    HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE = True
    HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK = None
    expected_login_template = 'helpdesk/registration/login.html'

    def test_non_staff_allowed(self):
        """If HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE is True,
        authenticated, non-staff users should be able to access
        the dashboard.
        """
        user = User.objects.create_user(username='henry.wensleydale', password='gouda', email='wensleydale@example.com')

        self.client.login(username=user.username, password='gouda')
        response = self.client.get(reverse('helpdesk_dashboard'), follow=True)
        self.assertTemplateUsed(response, 'helpdesk/dashboard.html')


class StaffUsersOnlyTestCase(StaffUserTestCaseMixin, TestCase):
    # Use default values
    HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE = False
    HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK = None

    def test_staff_only(self):
        """If HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE is False,
        only staff users should be able to access the dashboard.
        """
        user = get_staff_user()

        self.client.login(username=user.username, password='password')
        response = self.client.get(reverse('helpdesk_dashboard'), follow=True)
        self.assertTemplateUsed(response, 'helpdesk/dashboard.html')


class CustomStaffUserTestCase(StaffUserTestCaseMixin, TestCase):
    HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE = False
    expected_login_template = 'helpdesk/registration/login.html'

    @staticmethod
    def HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK(user):
        """Arbitrary user validation function"""
        return user.is_authenticated() and user.is_active and user.username.lower().endswith('wensleydale')

    def test_custom_staff_pass(self):
        """If HELPDESK_CUSTOM_STAFF_FILTER_CALLBACK is not None,
        a custom access rule is applied.
        """
        user = User.objects.create_user(username='henry.wensleydale', password='gouda', email='wensleydale@example.com')

        self.client.login(username=user.username, password='gouda')
        response = self.client.get(reverse('helpdesk_dashboard'), follow=True)
        self.assertTemplateUsed(response, 'helpdesk/dashboard.html')

    def test_custom_staff_fail(self):
        user = User.objects.create_user(username='terry.milton', password='frog', email='milton@example.com')

        self.client.login(username=user.username, password='frog')
        response = self.client.get(reverse('helpdesk_dashboard'), follow=True)
        self.assertTemplateUsed(response, self.expected_login_template)