import os

from leap.exceptions import SRPAuthenticationError
from mock import patch
from mockito import mock, when, any as ANY, verify, verifyZeroInteractions
from twisted.trial import unittest
from twisted.web.resource import IResource
from twisted.web.test.requesthelper import DummyRequest

from pixelated.bitmask_libraries.session import LeapSession
from pixelated.resources.auth import LeapUser
from pixelated.resources.login_resource import LoginResource
from test.unit.resources import DummySite


class TestLoginResource(unittest.TestCase):
    def setUp(self):
        self.services_factory = mock()
        self.portal = mock()
        self.resource = LoginResource(self.services_factory, self.portal)
        self.web = DummySite(self.resource)

    def test_children_resources_are_unauthorized_when_not_logged_in(self):
        request = DummyRequest(['/some_child_resource'])

        d = self.web.get(request)

        def assert_unauthorized_resources(_):
            self.assertEqual(401, request.responseCode)
            self.assertEqual("Unauthorized!", request.written[0])

        d.addCallback(assert_unauthorized_resources)
        return d

    @patch('pixelated.resources.session.PixelatedSession.is_logged_in')
    def test_there_are_no_grand_children_resources_when_logged_in(self, mock_is_logged_in):
        request = DummyRequest(['/login/grand_children'])
        mock_is_logged_in.return_value = True

        d = self.web.get(request)

        def assert_resources_not_found(_):
            self.assertEqual(404, request.responseCode)
            self.assertIn("No Such Resource", request.written[0])

        d.addCallback(assert_resources_not_found)
        return d

    def test_get(self):
        request = DummyRequest([''])

        d = self.web.get(request)

        def assert_form_rendered(_):
            self.assertEqual(200, request.responseCode)
            form_action = 'action="/login"'
            form_method = 'method="post"'
            input_username = 'name="username"'
            input_password = 'name="password"'
            input_submit = 'name="login"'
            written_response = ''.join(request.written)
            self.assertIn(form_action, written_response)
            self.assertIn(form_method, written_response)
            self.assertIn(input_password, written_response)
            self.assertIn(input_submit, written_response)
            self.assertIn(input_username, written_response)

        d.addCallback(assert_form_rendered)
        return d


class TestLoginPOST(unittest.TestCase):
    def setUp(self):
        self.services_factory = mock()
        self.portal = mock()
        self.resource = LoginResource(self.services_factory, self.portal)
        self.web = DummySite(self.resource)

        self.request = DummyRequest([''])
        username = 'ayoyo'
        self.request.addArg('username', username)
        password = 'ayoyo_password'
        self.request.addArg('password', password)
        self.request.method = 'POST'
        leap_session = mock(LeapSession)
        user_auth = mock()
        user_auth.uuid = 'some_user_uuid'
        leap_session.user_auth = user_auth
        config = mock()
        config.leap_home = 'some_folder'
        leap_session.config = config
        leap_session.fresh_account = False
        self.leap_session = leap_session
        self.leap_user = LeapUser(leap_session)

    @patch('twisted.web.util.redirectTo')
    @patch('pixelated.config.services.Services.setup')
    def test_login_responds_interstitial_and_add_corresponding_session_to_services_factory(self, mock_service_setup, mock_redirect):
        irrelevant = None
        when(self.portal).login(ANY(), None, IResource).thenReturn((irrelevant, self.leap_user, irrelevant))
        d = self.web.get(self.request)

        def assert_login_setup_service_for_user(_):
            verify(self.portal).login(ANY(), None, IResource)
            verify(self.services_factory).create_services_from(self.leap_session)
            interstitial_js_in_template = '<script src="startup-assets/Interstitial.js"></script>'
            self.assertIn(interstitial_js_in_template, self.request.written[0])
            self.assertTrue(self.resource.is_logged_in(self.request))

        d.addCallback(assert_login_setup_service_for_user)
        return d

    def test_should_return_form_back_with_error_message_when_login_fails(self, ):
        when(self.portal).login(ANY(), None, IResource).thenRaise(Exception())
        d = self.web.get(self.request)

        def assert_login_setup_service_for_user(_):
            verify(self.portal).login(ANY(), None, IResource)
            self.assertEqual(401, self.request.responseCode)
            written_response = ''.join(self.request.written)
            self.assertIn('Invalid credentials', written_response)
            self.assertFalse(self.resource.is_logged_in(self.request))

        d.addCallback(assert_login_setup_service_for_user)
        return d

    @patch('pixelated.bitmask_libraries.session.LeapSessionFactory.create')
    @patch('leap.auth.SRPAuth.authenticate')
    @patch('pixelated.config.services.Services.setup')
    def test_leap_session_is_not_created_when_leap_auth_fails(self, mock_service_setup, mock_leap_srp_auth, mock_leap_session_create):
        mock_leap_srp_auth.side_effect = SRPAuthenticationError()

        d = self.web.get(self.request)

        def assert_login_setup_service_for_user(_):
            verify(self.portal).login(ANY(), None, IResource)
            self.assertFalse(mock_leap_session_create.called)
            self.assertFalse(mock_service_setup.called)
            self.assertEqual(401, self.request.responseCode)
            self.assertFalse(self.resource.is_logged_in(self.request))

        d.addCallback(assert_login_setup_service_for_user)
        return d

    @patch('twisted.web.util.redirectTo')
    @patch('pixelated.resources.session.PixelatedSession.is_logged_in')
    def test_should_not_process_login_if_already_logged_in(self, mock_logged_in, mock_redirect):
        mock_logged_in.return_value = True
        mock_redirect.return_value = "mocked redirection"
        when(self.portal).login(ANY(), None, IResource).thenRaise(Exception())
        d = self.web.get(self.request)

        def assert_login_setup_service_for_user(_):
            verifyZeroInteractions(self.portal)
            mock_redirect.assert_called_once_with('/', self.request)

        d.addCallback(assert_login_setup_service_for_user)
        return d