import inspect
from unittest import mock

from django.test import TestCase, Client
from django.contrib.auth.models import Permission
from knox.models import AuthToken

from authentication.models import ExtendedUser
from core.settings import MAIL_DOMAIN
from inventory.models import Event
from mail.models import Email
from mail.protocol import LMTPHandler
from tickets.models import IssueThread


def make_mocked_coro(return_value=mock.sentinel, raise_exception=mock.sentinel):
    async def mock_coro(*args, **kwargs):
        if raise_exception is not mock.sentinel:
            raise raise_exception
        if not inspect.isawaitable(return_value):
            return return_value
        await return_value

    return mock.Mock(wraps=mock_coro)


class EmailsApiTest(TestCase):

    def setUp(self):
        super().setUp()
        self.user = ExtendedUser.objects.create_user('testuser', 'test', 'test')
        self.user.user_permissions.add(*Permission.objects.all())
        self.user.save()
        self.token = AuthToken.objects.create(user=self.user)
        self.client = Client(headers={'Authorization': 'Token ' + self.token[1]})

    def test_mails(self):
        Event.objects.get_or_create(
            name="Test event",
            slug="test-event",
        )
        Email.objects.create(
            subject='test',
            body='test',
            sender='test',
            recipient='test',
        )
        response = self.client.get('/api/2/mails/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(len(response.json()), 1)
        self.assertEqual(response.json()[0]['subject'], 'test')
        self.assertEqual(response.json()[0]['body'], 'test')
        self.assertEqual(response.json()[0]['sender'], 'test')
        self.assertEqual(response.json()[0]['recipient'], 'test')

    def test_mails_empty(self):
        response = self.client.get('/api/2/mails/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.json(), [])


class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test

    def setUp(self):
        super().setUp()
        self.user = ExtendedUser.objects.create_user('testuser', 'test', 'test')
        self.user.user_permissions.add(*Permission.objects.all())
        self.user.save()
        self.token = AuthToken.objects.create(user=self.user)
        self.client = Client(headers={'Authorization': 'Token ' + self.token[1]})

    def test_handle_client(self):
        from aiosmtpd.smtp import Envelope
        from asgiref.sync import async_to_sync
        import aiosmtplib
        aiosmtplib.send = make_mocked_coro()
        handler = LMTPHandler()
        server = mock.Mock()
        session = mock.Mock()
        envelope = Envelope()
        envelope.mail_from = 'test1@test'
        envelope.rcpt_tos = ['test2@test']
        envelope.content = b'Subject: test\nFrom: test3@test\nTo: test4@test\nMessage-ID: <1@test>\n\ntest'
        result = async_to_sync(handler.handle_DATA)(server, session, envelope)
        self.assertEqual(result, '250 Message accepted for delivery')
        self.assertEqual(len(Email.objects.all()), 2)
        self.assertEqual(len(IssueThread.objects.all()), 1)
        aiosmtplib.send.assert_called_once()
        self.assertEqual(Email.objects.all()[0].subject, 'test')
        self.assertEqual(Email.objects.all()[0].sender, 'test1@test')
        self.assertEqual(Email.objects.all()[0].recipient, 'test2@test')
        self.assertEqual(Email.objects.all()[0].body, 'test')
        self.assertEqual(Email.objects.all()[0].issue_thread, IssueThread.objects.all()[0])
        self.assertEqual(Email.objects.all()[0].reference, '<1@test>')
        self.assertEqual(Email.objects.all()[0].in_reply_to, None)
        self.assertEqual(Email.objects.all()[1].subject, 'Message received')
        self.assertEqual(Email.objects.all()[1].sender, 'test2@test')
        self.assertEqual(Email.objects.all()[1].recipient, 'test1@test')
        self.assertEqual(Email.objects.all()[1].body, 'Thank you for your message.')
        self.assertEqual(Email.objects.all()[1].issue_thread, IssueThread.objects.all()[0])
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual(Email.objects.all()[1].in_reply_to, "<1@test>")
        self.assertEqual(IssueThread.objects.all()[0].name, 'test')
        self.assertEqual(IssueThread.objects.all()[0].state, 'new')
        self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)

    def test_handle_client_reply(self):
        issue_thread = IssueThread.objects.create(
            name="test",
        )
        mail1 = Email.objects.create(
            subject='test subject',
            body='test',
            sender='test1@test',
            recipient='test2@test',
            issue_thread=issue_thread,
        )
        mail1_reply = Email.objects.create(
            subject='Message received',
            body='Thank you for your message.',
            sender='test2@test',
            recipient='test1@test',
            in_reply_to=mail1.reference,
            issue_thread=issue_thread,
        )
        from aiosmtpd.smtp import Envelope
        from asgiref.sync import async_to_sync
        import aiosmtplib
        aiosmtplib.send = make_mocked_coro()
        handler = LMTPHandler()
        server = mock.Mock()
        session = mock.Mock()
        envelope = Envelope()
        envelope.mail_from = 'test1@test'
        envelope.rcpt_tos = ['test2@test']
        envelope.content = (f'Subject: Re: test\nFrom: test3@test\nTo: test4@test\nMessage-ID: <3@test>\n'
                            f'In-Reply-To: {mail1_reply.reference}'.encode('utf-8') + b'\n\ntest')
        result = async_to_sync(handler.handle_DATA)(server, session, envelope)
        self.assertEqual(result, '250 Message accepted for delivery')
        self.assertEqual(len(Email.objects.all()), 3)
        self.assertEqual(len(IssueThread.objects.all()), 1)
        aiosmtplib.send.assert_not_called()
        self.assertEqual(Email.objects.all()[2].subject, 'Re: test')
        self.assertEqual(Email.objects.all()[2].sender, 'test1@test')
        self.assertEqual(Email.objects.all()[2].recipient, 'test2@test')
        self.assertEqual(Email.objects.all()[2].body, 'test')
        self.assertEqual(Email.objects.all()[2].issue_thread, issue_thread)
        self.assertEqual(Email.objects.all()[2].reference, '<3@test>')
        self.assertEqual(Email.objects.all()[2].in_reply_to, mail1_reply.reference)
        self.assertEqual(IssueThread.objects.all()[0].name, 'test')
        self.assertEqual(IssueThread.objects.all()[0].state, 'new')
        self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)

    def test_mail_reply(self):
        issue_thread = IssueThread.objects.create(
            name="test",
        )
        mail1 = Email.objects.create(
            subject='test subject',
            body='test',
            sender='test1@test',
            recipient='test2@' + MAIL_DOMAIN,
            issue_thread=issue_thread,
        )
        mail1_reply = Email.objects.create(
            subject='Re: test subject',
            body='Thank you for your message.',
            sender='test2@' + MAIL_DOMAIN,
            recipient='test1@test',
            in_reply_to=mail1.reference,
            issue_thread=issue_thread,
        )
        import aiosmtplib
        aiosmtplib.send = make_mocked_coro()
        response = self.client.post(f'/api/2/tickets/{issue_thread.id}/reply/', {
            'message': 'test'
        })
        self.assertEqual(response.status_code, 201)
        self.assertEqual(len(Email.objects.all()), 3)
        self.assertEqual(len(IssueThread.objects.all()), 1)
        aiosmtplib.send.assert_called_once()
        self.assertEqual(Email.objects.all()[2].subject, 'Re: test subject')
        self.assertEqual(Email.objects.all()[2].sender, 'test2@' + MAIL_DOMAIN)
        self.assertEqual(Email.objects.all()[2].recipient, 'test1@test')
        self.assertEqual(Email.objects.all()[2].body, 'test')
        self.assertEqual(Email.objects.all()[2].issue_thread, issue_thread)
        self.assertTrue(Email.objects.all()[2].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[2].reference.endswith("@localhost>"))
        self.assertEqual(Email.objects.all()[2].in_reply_to, mail1.reference)