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, EventAddress, EmailAttachment
from mail.protocol import LMTPHandler
from tickets.models import IssueThread, StateChange

expected_auto_reply_subject = 'Re: {} [#{}]'

expected_auto_reply = '''Your request (#{}) has been received and will be reviewed by our lost&found angels.

We are reviewing incoming requests during the event and teardown. Immediately after the event, expect a delay as the \
workload is high. We will not forget about your request and get back in touch once we have updated information on your \
request. Requests for devices, wallets, credit cards or similar items will be handled with priority.

If you happen to find your lost item or just want to add additional information, please reply to this email. Please \
do not create a new request.

Your c3lf (Cloakroom + Lost&Found) Team'''


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@localhost']
        envelope.content = b'Subject: test\nFrom: test3@test\nTo: test4@localhost\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('test', Email.objects.all()[0].subject)
        self.assertEqual('test1@test', Email.objects.all()[0].sender)
        self.assertEqual('test2@localhost', Email.objects.all()[0].recipient)
        self.assertEqual('test', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual(expected_auto_reply_subject.format('test', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test2@localhost', Email.objects.all()[1].sender)
        self.assertEqual('test1@test', Email.objects.all()[1].recipient)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)

    def test_handle_quoted_printable(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 =?utf-8?Q?=C3=A4?=\nFrom: test3@test\nTo: test4@test\nMessage-ID: <1@test>\n\nText mit Quoted-Printable-Kodierung: =?utf-8?Q?=C3=A4=C3=B6=C3=BC=C3=9F?='
        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('test ä', Email.objects.all()[0].subject)
        self.assertEqual('Text mit Quoted-Printable-Kodierung: äöüß', Email.objects.all()[0].body)

    def test_handle_quoted_printable_2(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: =?UTF-8?Q?suche_M=C3=BCtze?=\nFrom: test3@test\nTo: test4@test\nMessage-ID: <1@test>\n\nText mit Quoted-Printable-Kodierung: =?utf-8?Q?=C3=A4=C3=B6=C3=BC=C3=9F?='
        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('suche_Mütze', Email.objects.all()[0].subject)
        self.assertEqual('Text mit Quoted-Printable-Kodierung: äöüß', Email.objects.all()[0].body)

    def test_handle_base64(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: =?utf-8?B?dGVzdA==?=\nFrom: test3@test\nTo: test4@test\nMessage-ID: <1@test>\n\nText mit Base64-Kodierung: =?utf-8?B?w6TDtsO8w58=?='
        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('test', Email.objects.all()[0].subject)
        self.assertEqual('Text mit Base64-Kodierung: äöüß', Email.objects.all()[0].body)

    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, 'pending_new')
        self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)

    def test_handle_client_reply_2(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,
        )
        StateChange.objects.create(
            issue_thread=issue_thread,
            state='waiting_details',
        )
        self.assertEqual(IssueThread.objects.all()[0].state, 'waiting_details')
        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, 'pending_open')
        self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)

    def test_mail_reply(self):
        issue_thread = IssueThread.objects.create(
            name="test subject",
        )
        mail1 = Email.objects.create(
            subject='test subject',
            body='test',
            sender='test1@test',
            recipient='test2@localhost',
            issue_thread=issue_thread,
        )
        mail1_reply = Email.objects.create(
            subject='Message received',
            body='Thank you for your message.',
            sender='test2@localhost',
            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()[0].subject, 'test subject')
        self.assertEqual(Email.objects.all()[0].sender, 'test1@test')
        self.assertEqual(Email.objects.all()[0].recipient, 'test2@localhost')
        self.assertEqual(Email.objects.all()[0].body, 'test')
        self.assertEqual(Email.objects.all()[0].issue_thread, issue_thread)
        self.assertEqual(Email.objects.all()[0].reference, mail1.reference)
        self.assertEqual(Email.objects.all()[1].subject, 'Message received')
        self.assertEqual(Email.objects.all()[1].sender, 'test2@localhost')
        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, issue_thread)
        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, mail1.reference)
        self.assertEqual(Email.objects.all()[2].subject, 'Re: test subject [#{0}]'.format(issue_thread.short_uuid()))
        self.assertEqual(Email.objects.all()[2].sender, 'test2@localhost')
        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)

    def test_match_event(self):
        event = Event.objects.create(
            name="Test event",
            slug="test-event",
        )
        event_address = EventAddress.objects.create(
            event=event,
            address="test_event@localhost",
        )
        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 = ['test_event@localhost']
        envelope.content = b'Subject: test\nFrom: test1@test\nTo: test_event@localhost\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(event, Email.objects.all()[0].event)
        self.assertEqual(event, Email.objects.all()[1].event)
        self.assertEqual('test', Email.objects.all()[0].subject)
        self.assertEqual(expected_auto_reply_subject.format('test', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test1@test', Email.objects.all()[0].sender)
        self.assertEqual('test_event@localhost', Email.objects.all()[0].recipient)
        self.assertEqual('test_event@localhost', Email.objects.all()[1].sender)
        self.assertEqual('test1@test', Email.objects.all()[1].recipient)
        self.assertEqual('test', Email.objects.all()[0].body)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        self.assertEqual(1, len(IssueThread.objects.all()))
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)

    def test_split_text_inline_image(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
From: test1@test
To: test2@test
Message-ID: <1@test>
Content-Type: multipart/alternative; boundary="abc"

--abc
Content-Type: text/plain; charset=utf-8

test1

--abc
Content-Type: image/jpeg; name="test.jpg"
Content-Disposition: inline; filename="test.jpg"
Content-Transfer-Encoding: base64
Content-ID: <1>
X-Attachment-Id: 1

dGVzdGltYWdl

--abc
Content-Type: text/plain; charset=utf-8

test2

--abc--'''

        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('test', Email.objects.all()[0].subject)
        self.assertEqual('test1@test', Email.objects.all()[0].sender)
        self.assertEqual('test2@test', Email.objects.all()[0].recipient)
        self.assertEqual('test1\n<img src="cid:1">test2\n', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual(expected_auto_reply_subject.format('test', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test2@test', Email.objects.all()[1].sender)
        self.assertEqual('test1@test', Email.objects.all()[1].recipient)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)
        self.assertEqual(1, len(EmailAttachment.objects.all()))
        self.assertEqual(1, EmailAttachment.objects.all()[0].id)
        self.assertEqual('image/jpeg', EmailAttachment.objects.all()[0].mime_type)
        self.assertEqual('test.jpg', EmailAttachment.objects.all()[0].name)
        file_content = EmailAttachment.objects.all()[0].file.read()
        self.assertEqual(b'testimage', file_content)

    def test_text_with_attachment(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
From: test1@test
To: test2@test
Message-ID: <1@test>
Content-Type: multipart/mixed; boundary="abc"

--abc
Content-Type: text/plain; charset=utf-8

test1

--abc
Content-Type: image/jpeg; name="test.jpg"
Content-Disposition: attachment; filename="test.jpg"
Content-Transfer-Encoding: base64
Content-ID: <1>
X-Attachment-Id: 1

dGVzdGltYWdl

--abc--'''

        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('test', Email.objects.all()[0].subject)
        self.assertEqual('test1@test', Email.objects.all()[0].sender)
        self.assertEqual('test2@test', Email.objects.all()[0].recipient)
        self.assertEqual('test1\n', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual(expected_auto_reply_subject.format('test', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test2@test', Email.objects.all()[1].sender)
        self.assertEqual('test1@test', Email.objects.all()[1].recipient)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)
        self.assertEqual(1, len(EmailAttachment.objects.all()))
        self.assertEqual(1, EmailAttachment.objects.all()[0].id)
        self.assertEqual('image/jpeg', EmailAttachment.objects.all()[0].mime_type)
        self.assertEqual('test.jpg', EmailAttachment.objects.all()[0].name)
        file_content = EmailAttachment.objects.all()[0].file.read()
        self.assertEqual(b'testimage', file_content)

    def test_mail_noreply(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 = 'noreply@test'
        envelope.rcpt_tos = ['test2@test']
        envelope.content = b'Subject: test\nFrom: noreply@test\nTo: test2@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()), 1)
        self.assertEqual(len(IssueThread.objects.all()), 1)
        aiosmtplib.send.assert_not_called()
        self.assertEqual('test', Email.objects.all()[0].subject)
        self.assertEqual('noreply@test', Email.objects.all()[0].sender)
        self.assertEqual('test2@test', Email.objects.all()[0].recipient)
        self.assertEqual('test', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)

    def test_mail_empty_subject(self):
        from aiosmtpd.smtp import Envelope
        from asgiref.sync import async_to_sync
        import aiosmtplib
        import logging
        logging.disable(logging.CRITICAL)
        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'From: noreply@test\nTo: test2@test\nMessage-ID: <1@test>\n\ntest'
        result = async_to_sync(handler.handle_DATA)(server, session, envelope)
        logging.disable(logging.NOTSET)
        self.assertEqual('250 Message accepted for delivery', result)
        self.assertEqual(2, len(Email.objects.all()))
        self.assertEqual(1, len(IssueThread.objects.all()))
        aiosmtplib.send.assert_called_once()
        self.assertEqual('No subject', Email.objects.all()[0].subject)
        self.assertEqual('test1@test', Email.objects.all()[0].sender)
        self.assertEqual('test2@test', Email.objects.all()[0].recipient)
        self.assertEqual('test', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual(expected_auto_reply_subject.format('No subject', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test2@test', Email.objects.all()[1].sender)
        self.assertEqual('test1@test', Email.objects.all()[1].recipient)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('No subject', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)

    def test_mail_empty_body(self):
        from aiosmtpd.smtp import Envelope
        from asgiref.sync import async_to_sync
        import aiosmtplib
        import logging
        logging.disable(logging.CRITICAL)
        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: <test1@test>\nTo: test2@test\nMessage-ID: <1@test>\n\n'
        result = async_to_sync(handler.handle_DATA)(server, session, envelope)
        logging.disable(logging.NOTSET)
        self.assertEqual('250 Message accepted for delivery', result)
        self.assertEqual(2, len(Email.objects.all()))
        self.assertEqual(1, len(IssueThread.objects.all()))
        aiosmtplib.send.assert_called_once()
        self.assertEqual('test', Email.objects.all()[0].subject)
        self.assertEqual('<test1@test>', Email.objects.all()[0].sender)
        self.assertEqual('test2@test', Email.objects.all()[0].recipient)
        self.assertEqual('', Email.objects.all()[0].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[0].issue_thread)
        self.assertEqual('<1@test>', Email.objects.all()[0].reference)
        self.assertEqual(None, Email.objects.all()[0].in_reply_to)
        self.assertEqual(expected_auto_reply_subject.format('test', IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].subject)
        self.assertEqual('test2@test', Email.objects.all()[1].sender)
        self.assertEqual('<test1@test>', Email.objects.all()[1].recipient)
        self.assertEqual(expected_auto_reply.format(IssueThread.objects.all()[0].short_uuid()),
                         Email.objects.all()[1].body)
        self.assertEqual(IssueThread.objects.all()[0], Email.objects.all()[1].issue_thread)
        self.assertTrue(Email.objects.all()[1].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[1].reference.endswith("@localhost>"))
        self.assertEqual("<1@test>", Email.objects.all()[1].in_reply_to)
        self.assertEqual('test', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)
        states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
        self.assertEqual(1, len(states))
        self.assertEqual('pending_new', states[0].state)

    def test_mail_plus_issue_thread(self):
        issue_thread = IssueThread.objects.create(
            name="test subject",
        )
        mail1 = Email.objects.create(
            subject='test subject',
            body='test',
            sender='test1@test',
            recipient='test2@localhost',
            issue_thread=issue_thread,
        )
        mail1_reply = Email.objects.create(
            subject='Message received',
            body='Thank you for your message.',
            sender='test2@localhost',
            recipient='test1@test',
            in_reply_to=mail1.reference,
            issue_thread=issue_thread,
        )
        from aiosmtpd.smtp import Envelope
        from asgiref.sync import async_to_sync
        from email.message import EmailMessage
        import aiosmtplib
        import logging
        logging.disable(logging.CRITICAL)
        aiosmtplib.send = make_mocked_coro()
        handler = LMTPHandler()
        server = mock.Mock()
        session = mock.Mock()
        envelope = Envelope()
        envelope.mail_from = '<test1@test>'
        envelope.rcpt_tos = ['ticket+{}@test'.format(issue_thread.uuid)]
        envelope.content = (f'Subject: foo\nFrom: <test3@test>\nTo: ticket+{issue_thread.uuid}@test\n'
                            f'Message-ID: <3@test>\n\nbar'.encode('utf-8'))
        result = async_to_sync(handler.handle_DATA)(server, session, envelope)
        logging.disable(logging.NOTSET)
        self.assertEqual('250 Message accepted for delivery', result)
        self.assertEqual(3, len(Email.objects.all()))
        self.assertEqual(3, len(Email.objects.filter(issue_thread=issue_thread)))
        self.assertEqual(1, len(IssueThread.objects.all()))
        aiosmtplib.send.assert_not_called()
        self.assertEqual(Email.objects.all()[2].subject, 'foo')
        self.assertEqual(Email.objects.all()[2].sender, '<test1@test>')
        self.assertEqual(Email.objects.all()[2].recipient, 'ticket+{}@test'.format(issue_thread.uuid))
        self.assertEqual(Email.objects.all()[2].body, 'bar')
        self.assertEqual(Email.objects.all()[2].issue_thread, issue_thread)
        self.assertEqual(Email.objects.all()[2].reference, '<3@test>')
        self.assertEqual('test subject', IssueThread.objects.all()[0].name)
        response = self.client.post(f'/api/2/tickets/{issue_thread.id}/reply/', {
            'message': 'test'
        })
        aiosmtplib.send.assert_called_once();
        self.assertEqual(response.status_code, 201)
        self.assertEqual(4, len(Email.objects.all()))
        self.assertEqual(4, len(Email.objects.filter(issue_thread=issue_thread)))
        self.assertEqual(1, len(IssueThread.objects.all()))
        self.assertEqual(Email.objects.all()[3].subject, 'Re: test subject [#{0}]'.format(issue_thread.short_uuid()))
        self.assertEqual(Email.objects.all()[3].sender, 'test2@localhost')
        self.assertEqual(Email.objects.all()[3].recipient, 'test1@test')
        self.assertEqual(Email.objects.all()[3].body, 'test')
        self.assertEqual(Email.objects.all()[3].issue_thread, issue_thread)
        self.assertTrue(Email.objects.all()[3].reference.startswith("<"))
        self.assertTrue(Email.objects.all()[3].reference.endswith("@localhost>"))
        self.assertEqual(Email.objects.all()[3].in_reply_to, mail1.reference)
        self.assertEqual('test subject', IssueThread.objects.all()[0].name)
        self.assertEqual('pending_new', IssueThread.objects.all()[0].state)
        self.assertEqual(None, IssueThread.objects.all()[0].assigned_to)