from __future__ import absolute_import
from __future__ import print_function

import os
import random
import re
import ujson

from django.conf import settings
from django.core import mail
from django.http import HttpResponse
from django.test import override_settings
from email.utils import formataddr
from mock import patch, MagicMock
from six.moves import range
from typing import Any, Dict, List, Text

from zerver.lib.notifications import handle_missedmessage_emails, \
    relative_to_full_url
from zerver.lib.actions import do_update_message
from zerver.lib.message import access_message
from zerver.lib.test_classes import ZulipTestCase
from zerver.lib.send_email import FromAddress
from zerver.models import (
    Recipient,
    UserMessage,
    UserProfile,
)
from zerver.lib.test_helpers import get_test_image_file

class TestMissedMessages(ZulipTestCase):
    def normalize_string(self, s):
        # type: (Text) -> Text
        s = s.strip()
        return re.sub(r'\s+', ' ', s)

    def _get_tokens(self):
        # type: () -> List[str]
        return [str(random.getrandbits(32)) for _ in range(30)]

    def _test_cases(self, tokens, msg_id, body, subject, send_as_user, verify_html_body=False):
        # type: (List[str], int, str, str, bool, bool) -> None
        othello = self.example_user('othello')
        hamlet = self.example_user('hamlet')
        handle_missedmessage_emails(hamlet.id, [{'message_id': msg_id}])
        if settings.EMAIL_GATEWAY_PATTERN != "":
            reply_to_addresses = [settings.EMAIL_GATEWAY_PATTERN % (u'mm' + t) for t in tokens]
            reply_to_emails = [formataddr(("Zulip", address)) for address in reply_to_addresses]
        else:
            reply_to_emails = ["noreply@testserver"]
        msg = mail.outbox[0]
        from_email = formataddr(("Zulip missed messages", FromAddress.NOREPLY))
        self.assertEqual(len(mail.outbox), 1)
        if send_as_user:
            from_email = '"%s" <%s>' % (othello.full_name, othello.email)
        self.assertEqual(msg.from_email, from_email)
        self.assertEqual(msg.subject, subject)
        self.assertEqual(len(msg.reply_to), 1)
        self.assertIn(msg.reply_to[0], reply_to_emails)
        if verify_html_body:
            self.assertIn(body, self.normalize_string(msg.alternatives[0][0]))
        else:
            self.assertIn(body, self.normalize_string(msg.body))

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_missed_stream_messages_mention(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        for i in range(0, 11):
            self.send_message(self.example_email('othello'), "Denmark", Recipient.STREAM, str(i))
        self.send_message(self.example_email('othello'), "Denmark", Recipient.STREAM, '11', subject='test2')
        msg_id = self.send_message(self.example_email('othello'), "denmark", Recipient.STREAM, '@**King Hamlet**')
        body = 'Denmark > test Othello, the Moor of Venice 1 2 3 4 5 6 7 8 9 10 @**King Hamlet**'
        subject = 'Othello, the Moor of Venice mentioned you'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_missed_stream_messages_mention_two_senders(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        for i in range(0, 3):
            self.send_message(self.example_email('cordelia'), "Denmark", Recipient.STREAM, str(i))
        msg_id = self.send_message(self.example_email('othello'), "Denmark", Recipient.STREAM, '@**King Hamlet**')
        body = 'Denmark > test Cordelia Lear 0 1 2 Othello, the Moor of Venice @**King Hamlet**'
        subject = 'Othello, the Moor of Venice mentioned you'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_personal_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Extremely personal message!')
        body = 'You and Othello, the Moor of Venice Extremely personal message!'
        subject = 'Othello, the Moor of Venice sent you a message'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _reply_to_email_in_personal_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Extremely personal message!')
        body = 'Or just reply to this email.'
        subject = 'Othello, the Moor of Venice sent you a message'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _reply_warning_in_personal_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Extremely personal message!')
        body = 'Please do not reply to this automated message.'
        subject = 'Othello, the Moor of Venice sent you a message'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_huddle_missed_stream_messages_two_others(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'),
                                   [self.example_email('hamlet'), self.example_email('iago')],
                                   Recipient.HUDDLE,
                                   'Group personal message!')

        body = ('You and Iago, Othello, the Moor of Venice Othello,'
                ' the Moor of Venice Group personal message')
        subject = 'Group PMs with Iago and Othello, the Moor of Venice'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_huddle_missed_stream_messages_three_others(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'),
                                   [self.example_email('hamlet'), self.example_email('iago'), self.example_email('cordelia')],
                                   Recipient.HUDDLE,
                                   'Group personal message!')

        body = ('You and Cordelia Lear, Iago, Othello, the Moor of Venice Othello,'
                ' the Moor of Venice Group personal message')
        subject = 'Group PMs with Cordelia Lear, Iago, and Othello, the Moor of Venice'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _extra_context_in_huddle_missed_stream_messages_many_others(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'),
                                   [self.example_email('hamlet'),
                                    self.example_email('iago'),
                                    self.example_email('cordelia'),
                                    self.example_email('prospero')],
                                   Recipient.HUDDLE,
                                   'Group personal message!')

        body = ('You and Cordelia Lear, Iago, Othello, the Moor of Venice, Prospero from The Tempest'
                ' Othello, the Moor of Venice Group personal message')
        subject = 'Group PMs with Cordelia Lear, Iago, and 2 others'
        self._test_cases(tokens, msg_id, body, subject, send_as_user)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _deleted_message_in_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), "denmark", Recipient.STREAM,
                                   '@**King Hamlet** to be deleted')

        hamlet = self.example_user('hamlet')
        email = self.example_email('othello')
        self.login(email)
        result = self.client_patch('/json/messages/' + str(msg_id),
                                   {'message_id': msg_id, 'content': ' '})
        self.assert_json_success(result)
        handle_missedmessage_emails(hamlet.id, [{'message_id': msg_id}])
        self.assertEqual(len(mail.outbox), 0)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _deleted_message_in_personal_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'),
                                   self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Extremely personal message! to be deleted!')

        hamlet = self.example_user('hamlet')
        email = self.example_email('othello')
        self.login(email)
        result = self.client_patch('/json/messages/' + str(msg_id),
                                   {'message_id': msg_id, 'content': ' '})
        self.assert_json_success(result)
        handle_missedmessage_emails(hamlet.id, [{'message_id': msg_id}])
        self.assertEqual(len(mail.outbox), 0)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def _deleted_message_in_huddle_missed_stream_messages(self, send_as_user, mock_random_token):
        # type: (bool, MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'),
                                   [self.example_email('hamlet'),
                                    self.example_email('iago')],
                                   Recipient.PERSONAL, 'Group personal message!')

        hamlet = self.example_user('hamlet')
        iago = self.example_user('iago')
        email = self.example_email('othello')
        self.login(email)
        result = self.client_patch('/json/messages/' + str(msg_id),
                                   {'message_id': msg_id, 'content': ' '})
        self.assert_json_success(result)
        handle_missedmessage_emails(hamlet.id, [{'message_id': msg_id}])
        self.assertEqual(len(mail.outbox), 0)
        handle_missedmessage_emails(iago.id, [{'message_id': msg_id}])
        self.assertEqual(len(mail.outbox), 0)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_missed_stream_messages_as_user(self):
        # type: () -> None
        self._extra_context_in_missed_stream_messages_mention(True)

    def test_extra_context_in_missed_stream_messages(self):
        # type: () -> None
        self._extra_context_in_missed_stream_messages_mention(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_missed_stream_messages_as_user_two_senders(self):
        # type: () -> None
        self._extra_context_in_missed_stream_messages_mention_two_senders(True)

    def test_extra_context_in_missed_stream_messages_two_senders(self):
        # type: () -> None
        self._extra_context_in_missed_stream_messages_mention_two_senders(False)

    def test_reply_to_email_in_personal_missed_stream_messages(self):
        # type: () -> None
        self._reply_to_email_in_personal_missed_stream_messages(False)

    @override_settings(EMAIL_GATEWAY_PATTERN="")
    def test_reply_warning_in_personal_missed_stream_messages(self):
        # type: () -> None
        self._reply_warning_in_personal_missed_stream_messages(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_personal_missed_stream_messages_as_user(self):
        # type: () -> None
        self._extra_context_in_personal_missed_stream_messages(True)

    def test_extra_context_in_personal_missed_stream_messages(self):
        # type: () -> None
        self._extra_context_in_personal_missed_stream_messages(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_huddle_missed_stream_messages_two_others_as_user(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_two_others(True)

    def test_extra_context_in_huddle_missed_stream_messages_two_others(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_two_others(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_huddle_missed_stream_messages_three_others_as_user(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_three_others(True)

    def test_extra_context_in_huddle_missed_stream_messages_three_others(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_three_others(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_extra_context_in_huddle_missed_stream_messages_many_others_as_user(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_many_others(True)

    def test_extra_context_in_huddle_missed_stream_messages_many_others(self):
        # type: () -> None
        self._extra_context_in_huddle_missed_stream_messages_many_others(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_deleted_message_in_missed_stream_messages_as_user(self):
        # type: () -> None
        self._deleted_message_in_missed_stream_messages(True)

    def test_deleted_message_in_missed_stream_messages(self):
        # type: () -> None
        self._deleted_message_in_missed_stream_messages(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_deleted_message_in_personal_missed_stream_messages_as_user(self):
        # type: () -> None
        self._deleted_message_in_personal_missed_stream_messages(True)

    def test_deleted_message_in_personal_missed_stream_messages(self):
        # type: () -> None
        self._deleted_message_in_personal_missed_stream_messages(False)

    @override_settings(SEND_MISSED_MESSAGE_EMAILS_AS_USER=True)
    def test_deleted_message_in_huddle_missed_stream_messages_as_user(self):
        # type: () -> None
        self._deleted_message_in_huddle_missed_stream_messages(True)

    def test_deleted_message_in_huddle_missed_stream_messages(self):
        # type: () -> None
        self._deleted_message_in_huddle_missed_stream_messages(False)

    @override_settings(REALMS_HAVE_SUBDOMAINS=True)
    @patch('zerver.lib.email_mirror.generate_random_token')
    def test_realm_emoji_in_missed_message(self, mock_random_token):
        # type: (MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Extremely personal message with a realm emoji :green_tick:!')
        body = '<img alt=":green_tick:" height="20px" style="position: relative;top: 6px;" src="http://zulip.testserver/user_avatars/1/emoji/green_tick.png" title="green tick">'
        subject = 'Othello, the Moor of Venice sent you a message'
        self._test_cases(tokens, msg_id, body, subject, send_as_user=False, verify_html_body=True)

    @override_settings(REALMS_HAVE_SUBDOMAINS=True)
    @patch('zerver.lib.email_mirror.generate_random_token')
    def test_stream_link_in_missed_message(self, mock_random_token):
        # type: (MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        msg_id = self.send_message(self.example_email('othello'), self.example_email('hamlet'),
                                   Recipient.PERSONAL,
                                   'Come and join us in #**Verona**.')
        body = '<a class="stream" data-stream-id="5" href="http://zulip.testserver/#narrow/stream/Verona">#Verona</a'
        subject = 'Othello, the Moor of Venice sent you a message'
        self._test_cases(tokens, msg_id, body, subject, send_as_user=False, verify_html_body=True)

    @patch('zerver.lib.email_mirror.generate_random_token')
    def test_multiple_missed_personal_messages(self, mock_random_token):
        # type: (MagicMock) -> None
        tokens = self._get_tokens()
        mock_random_token.side_effect = tokens

        hamlet = self.example_user('hamlet')
        msg_id_1 = self.send_message(self.example_email('othello'),
                                     hamlet.email,
                                     Recipient.PERSONAL,
                                     'Personal Message 1')
        msg_id_2 = self.send_message(self.example_email('iago'),
                                     hamlet.email,
                                     Recipient.PERSONAL,
                                     'Personal Message 2')

        handle_missedmessage_emails(hamlet.id, [
            {'message_id': msg_id_1},
            {'message_id': msg_id_2},
        ])
        self.assertEqual(len(mail.outbox), 2)
        subject = 'Iago sent you a message'
        self.assertEqual(mail.outbox[0].subject, subject)
        subject = 'Othello, the Moor of Venice sent you a message'
        self.assertEqual(mail.outbox[1].subject, subject)

    def test_relative_to_full_url(self):
        # type: () -> None
        # Run `relative_to_full_url()` function over test fixtures present in
        # 'markdown_test_cases.json' and check that it converts all the relative
        # URLs to absolute URLs.
        fixtures_file = os.path.join(os.path.dirname(
            os.path.dirname(__file__)), "fixtures", "markdown_test_cases.json")
        fixtures = ujson.load(open(fixtures_file))
        test_fixtures = {}
        for test in fixtures['regular_tests']:
            test_fixtures[test['name']] = test
        for test_name in test_fixtures:
            test_data = test_fixtures[test_name]["expected_output"]
            output_data = relative_to_full_url("http://example.com", test_data)
            if re.search("(?<=\=['\"])/(?=[^<]+>)", output_data) is not None:
                raise AssertionError("Relative URL present in email: " + output_data +
                                     "\nFailed test case's name is: " + test_name +
                                     "\nIt is present in markdown_test_cases.json")

        # Specific test cases.
        test_data = "<p>Check out the file at: '/static/generated/emoji/images/emoji/'</p>"
        actual_output = relative_to_full_url("http://example.com", test_data)
        expected_output = "<p>Check out the file at: '/static/generated/emoji/images/emoji/'</p>"
        self.assertEqual(actual_output, expected_output)

        test_data = '<a href="/user_uploads/2/1f/some_random_value">/user_uploads/2/1f/some_random_value</a>'
        actual_output = relative_to_full_url("http://example.com", test_data)
        expected_output = '<a href="http://example.com/user_uploads/2/1f/some_random_value">' + \
            '/user_uploads/2/1f/some_random_value</a>'
        self.assertEqual(actual_output, expected_output)

        test_data = '<p>Set src="/avatar/username@example.com?s=30"</p>'
        actual_output = relative_to_full_url("http://example.com", test_data)
        expected_output = '<p>Set src="/avatar/username@example.com?s=30"</p>'
        self.assertEqual(actual_output, expected_output)