# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

import base64
import email
import email.policy
import time

from ast import literal_eval
from collections import defaultdict
from contextlib import contextmanager
from freezegun import freeze_time
from functools import partial
from lxml import html
from unittest.mock import patch

from odoo.addons.base.models.ir_mail_server import IrMailServer
from odoo.addons.base.tests.common import MockSmtplibCase
from odoo.addons.bus.models.bus import ImBus, json_dump
from odoo.addons.mail.models.mail_mail import MailMail
from odoo.addons.mail.models.mail_message import Message
from odoo.addons.mail.models.mail_notification import MailNotification
from odoo.addons.mail.models.res_users import Users
from odoo.tests import common, new_test_user
from odoo.tools import email_normalize, formataddr, mute_logger, pycompat
from odoo.tools.translate import code_translations

mail_new_test_user = partial(new_test_user, context={'mail_create_nolog': True,
                                                     'mail_create_nosubscribe': True,
                                                     'mail_notrack': True,
                                                     'no_reset_password': True})


class MockEmail(common.BaseCase, MockSmtplibCase):
    """ Tools, helpers and asserts for mailgateway-related tests

    Useful reminders
        Mail state: ('outgoing', 'Outgoing'), ('sent', 'Sent'),
                    ('received', 'Received'), ('exception', 'Delivery Failed'),
                    ('cancel', 'Cancelled')
    """

    @classmethod
    def setUpClass(cls):
        super(MockEmail, cls).setUpClass()
        cls._mc_enabled = False

    # ------------------------------------------------------------
    # UTILITY MOCKS
    # ------------------------------------------------------------

    @contextmanager
    def mock_datetime_and_now(self, mock_dt):
        """ Used when synchronization date (using env.cr.now()) is important
        in addition to standard datetime mocks. Used mainly to detect sync
        issues. """
        with freeze_time(mock_dt), \
             patch.object(self.env.cr, 'now', lambda: mock_dt):
            yield

    # ------------------------------------------------------------
    # GATEWAY MOCK
    # ------------------------------------------------------------

    @contextmanager
    def mock_mail_gateway(self, mail_unlink_sent=False):
        build_email_origin = IrMailServer.build_email
        send_email_origin = IrMailServer.send_email
        mail_create_origin = MailMail.create
        mail_private_send_origin = MailMail._send
        mail_unlink_origin = MailMail.unlink
        self.mail_unlink_sent = mail_unlink_sent
        self._init_mail_mock()

        def _ir_mail_server_build_email(model, email_from, email_to, subject, body, **kwargs):
            self._mails.append({
                'email_from': email_from,
                'email_to': email_to,
                'subject': subject,
                'body': body,
                **kwargs,
            })
            return build_email_origin(model, email_from, email_to, subject, body, **kwargs)

        def _mail_mail_create(model, *args, **kwargs):
            res = mail_create_origin(model, *args, **kwargs)
            self._new_mails += res.sudo()
            return res

        def _mail_mail_unlink(model, *args, **kwargs):
            if self.mail_unlink_sent:
                return mail_unlink_origin(model, *args, **kwargs)
            return True

        with self.mock_smtplib_connection(), \
             patch.object(IrMailServer, 'build_email', autospec=True, wraps=IrMailServer, side_effect=_ir_mail_server_build_email) as build_email_mocked, \
             patch.object(IrMailServer, 'send_email', autospec=True, wraps=IrMailServer, side_effect=send_email_origin) as send_email_mocked, \
             patch.object(MailMail, 'create', autospec=True, wraps=MailMail, side_effect=_mail_mail_create) as mail_mail_create_mocked, \
             patch.object(MailMail, '_send', autospec=True, wraps=MailMail, side_effect=mail_private_send_origin) as mail_mail_private_send_mocked, \
             patch.object(MailMail, 'unlink', autospec=True, wraps=MailMail, side_effect=_mail_mail_unlink):
            self.build_email_mocked = build_email_mocked
            self.send_email_mocked = send_email_mocked
            self.mail_mail_create_mocked = mail_mail_create_mocked
            self.mail_mail_private_send_mocked = mail_mail_private_send_mocked
            yield

    def _init_mail_mock(self):
        self._mails = []
        self._new_mails = self.env['mail.mail'].sudo()

    @classmethod
    def _init_mail_gateway(cls):
        super()._init_mail_gateway()
        # main company alias parameters
        cls.alias_domain = 'test.mycompany.com'
        cls.alias_catchall = 'catchall.test'
        cls.alias_bounce = 'bounce.test'
        cls.default_from = 'notifications.test'
        cls.default_from_filter = False
        cls.env['ir.config_parameter'].set_param('mail.default.from_filter', cls.default_from_filter)

        # ensure global alias domain for tests: to ease tests, search or create
        # the default test domains
        cls.env['mail.alias.domain'].search([]).write({'sequence': 9999})
        cls.mail_alias_domain = cls._init_alias_domain(cls.alias_domain, {
            'bounce_alias': cls.alias_bounce,
            'catchall_alias': cls.alias_catchall,
            'company_ids': [(4, cls.env.ref('base.user_admin').company_id.id)],
            'default_from': cls.default_from,
            'name': cls.alias_domain,
            'sequence': 1,
        })
        if cls._mc_enabled:
            # alias domain specific to new company
            cls.alias_bounce_c2 = 'bounce.c2'
            cls.alias_catchall_c2 = 'catchall.c2'
            cls.alias_default_from_c2 = 'notifications.c2'
            cls.alias_domain_c2_name = 'test.mycompany2.com'
            cls.mail_alias_domain_c2 = cls._init_alias_domain(cls.alias_domain_c2_name, {
                'bounce_alias': cls.alias_bounce_c2,
                'catchall_alias': cls.alias_catchall_c2,
                'company_ids': [(4, cls.company_2.id)],
                'default_from': cls.alias_default_from_c2,
                'name': cls.alias_domain_c2_name,
                'sequence': 2,
            })

            # alias domain specific to third company
            cls.alias_bounce_c3 = 'bounce.c3'
            cls.alias_catchall_c3 = 'catchall.c3'
            cls.alias_default_from_c3 = 'notifications.c3'
            cls.alias_domain_c3_name = 'test.mycompany3.com'
            cls.mail_alias_domain_c3 = cls._init_alias_domain(cls.alias_domain_c3_name, {
                'bounce_alias': cls.alias_bounce_c3,
                'catchall_alias': cls.alias_catchall_c3,
                'company_ids': [(4, cls.company_3.id)],
                'default_from': cls.alias_default_from_c3,
                'name': cls.alias_domain_c3_name,
                'sequence': 3,
            })

        # mailer daemon email preformatting
        cls.mailer_daemon_email = formataddr(('MAILER-DAEMON', f'{cls.alias_bounce}@{cls.alias_domain}'))

    @classmethod
    def _init_alias_domain(cls, name, values):
        alias_domain = cls.env['mail.alias.domain'].search([('name', '=', name)])
        if alias_domain:
            alias_domain.write(values)
        else:
            alias_domain = cls.env['mail.alias.domain'].create(values)
        return alias_domain

    # ------------------------------------------------------------
    # GATEWAY TOOLS
    # ------------------------------------------------------------

    def format(self, template, to='groups@example.com, other@gmail.com', subject='Frogs',
               email_from='Sylvie Lelitre <test.sylvie.lelitre@agrolait.com>', return_path='', cc='',
               extra='', msg_id='<1198923581.41972151344608186760.JavaMail@agrolait.com>',
               references='', **kwargs):
        if not return_path:
            return_path = '<whatever-2a840@postmaster.twitter.com>'
        return template.format(
            subject=subject, to=to, cc=cc,
            email_from=email_from, return_path=return_path,
            extra=extra, msg_id=msg_id, references=references,
            **kwargs)

    def format_and_process(self, template, email_from, to, subject='Frogs', cc='',
                           return_path='', extra='',  msg_id=False,
                           model=None, target_model='mail.test.gateway', target_field='name',
                           with_user=None, **kwargs):
        self.assertFalse(self.env[target_model].search([(target_field, '=', subject)]))
        if not msg_id:
            msg_id = "<%.7f-test@iron.sky>" % (time.time())

        mail = self.format(template, to=to, subject=subject, cc=cc,
                           return_path=return_path, extra=extra,
                           email_from=email_from, msg_id=msg_id,
                           **kwargs)
        # In real use case, fetched mail processing is executed with administrative right.
        self.env['mail.thread'].with_user(with_user or self.env.user).sudo().message_process(model, mail)
        return self.env[target_model].search([(target_field, '=', subject)])

    def gateway_reply_wrecord(self, template, record, use_in_reply_to=True):
        """ Deprecated, remove in 14.4 """
        return self.gateway_mail_reply_wrecord(template, record, use_in_reply_to=use_in_reply_to)

    def gateway_mail_reply_wrecord(self, template, record, use_in_reply_to=True,
                                   target_model=None, target_field=None):
        """ Simulate a reply through the mail gateway. Usage: giving a record,
        find an email sent to them and use its message-ID to simulate a reply.

        Some noise is added in References just to test some robustness. """
        mail_mail = self._find_mail_mail_wrecord(record)

        if use_in_reply_to:
            extra = 'In-Reply-To:\r\n\t%s\n' % mail_mail.message_id
        else:
            disturbing_other_msg_id = '<123456.654321@another.host.com>'
            extra = 'References:\r\n\t%s\n\r%s' % (mail_mail.message_id, disturbing_other_msg_id)

        return self.format_and_process(
            template,
            mail_mail.email_to,
            mail_mail.reply_to,
            subject='Re: %s' % mail_mail.subject,
            extra=extra,
            msg_id='<123456.%s.%d@test.example.com>' % (record._name, record.id),
            target_model=target_model or record._name,
            target_field=target_field or record._rec_name,
        )

    def gateway_mail_reply_wemail(self, template, email_to, use_in_reply_to=True,
                                  target_model=None, target_field=None):
        """ Simulate a reply through the mail gateway. Usage: giving a record,
        find an email sent to them and use its message-ID to simulate a reply.

        Some noise is added in References just to test some robustness. """
        sent_mail = self._find_sent_mail_wemail(email_to)

        if use_in_reply_to:
            extra = 'In-Reply-To:\r\n\t%s\n' % sent_mail['message_id']
        else:
            disturbing_other_msg_id = '<123456.654321@another.host.com>'
            extra = 'References:\r\n\t%s\n\r%s' % (sent_mail['message_id'], disturbing_other_msg_id)

        return self.format_and_process(
            template,
            sent_mail['email_to'],
            sent_mail['reply_to'],
            subject='Re: %s' % sent_mail['subject'],
            extra=extra,
            target_model=target_model,
            target_field=target_field or 'name',
        )

    def from_string(self, text):
        return email.message_from_string(pycompat.to_text(text), policy=email.policy.SMTP)

    def assertHtmlEqual(self, value, expected, message=None):
        tree = html.fragment_fromstring(value, parser=html.HTMLParser(encoding='utf-8'), create_parent='body')

        # mass mailing: add base tag we have to remove
        for base_node in tree.xpath('//base'):
            base_node.getparent().remove(base_node)

        # chatter: read more / read less TODO

        # mass mailing: add base tag we have to remove
        expected_node = html.fragment_fromstring(expected, create_parent='body')

        if message:
            self.assertEqual(tree, expected_node, message)
        else:
            self.assertEqual(tree, expected_node)

    # ------------------------------------------------------------
    # GATEWAY GETTERS
    # ------------------------------------------------------------

    def _find_sent_mail_wemail(self, email_to):
        """ Find a sent email with a given list of recipients. Email should match
        exactly the recipients.

        :param email-to: a list of emails that will be compared to email_to
          of sent emails (also a list of emails);

        :return email: an email which is a dictionary mapping values given to
          ``build_email``;
        """
        for sent_email in self._mails:
            if set(sent_email['email_to']) == set([email_to]):
                break
        else:
            raise AssertionError('sent mail not found for email_to %s' % (email_to))
        return sent_email

    def _filter_mail(self, status=None, mail_message=None, author=None, email_from=None):
        """ Filter mail generated during mock, based on common parameters

        :param status: state of mail.mail. If not void use it to filter mail.mail
          record;
        :param mail_message: optional check/filter on mail_message_id field aka
          a ``mail.message`` record;
        :param author: optional check/filter on author_id field aka a ``res.partner``
          record;
        :param email_from: optional check/filter on email_from field (may differ from
          author, used notably in case of concurrent mailings to distinguish emails);
        """
        filtered = self._new_mails.env['mail.mail']
        for mail in self._new_mails:
            if status is not None and mail.state != status:
                continue
            if mail_message is not None and mail.mail_message_id != mail_message:
                continue
            if author is not None and mail.author_id != author:
                continue
            if email_from is not None and mail.email_from != email_from:
                continue
            filtered += mail
        return filtered

    def _find_mail_mail_wid(self, mail_id, status=None, mail_message=None, author=None, email_from=None):
        """ Find a ``mail.mail`` record based on a given ID (used notably when having
        mail ID in mailing traces).

        :return mail: a ``mail.mail`` record generated during the mock and matching
          given ID;
        """
        filtered = self._filter_mail(status=status, mail_message=mail_message, author=author, email_from=email_from)
        for mail in filtered:
            if mail.id == mail_id:
                break
        else:
            debug_info = '\n'.join(
                f'From: {mail.author_id} ({mail.email_from}) - ID {mail.id} (State: {mail.state})'
                for mail in self._new_mails
            )
            raise AssertionError(
                f'mail.mail not found for ID {mail_id} / message {mail_message} / status {status} / author {author} ({email_from})\n{debug_info}'
            )
        return mail

    def _find_mail_mail_wpartners(self, recipients, status, mail_message=None, author=None, email_from=None):
        """ Find a mail.mail record based on various parameters, notably a list
        of recipients (partners).

        :param recipients: a ``res.partner`` recordset Check all of them are in mail
          recipients to find the right mail.mail record;

        :return mail: a ``mail.mail`` record generated during the mock and matching
          given parameters and filters;
        """
        filtered = self._filter_mail(status=status, mail_message=mail_message, author=author, email_from=email_from)
        for mail in filtered:
            if all(p in mail.recipient_ids for p in recipients):
                break
        else:
            debug_info = '\n'.join(
                f'From: {mail.author_id} ({mail.email_from}) - To: {sorted(mail.recipient_ids.ids)} (State: {mail.state})'
                for mail in self._new_mails
            )
            recipients_info = f'Missing: {[r.name for r in recipients if r.id not in filtered.recipient_ids.ids]}'
            raise AssertionError(
                f'mail.mail not found for message {mail_message} / status {status} / recipients {sorted(recipients.ids)} / author {author} ({email_from})\n{recipients_info}\n{debug_info}'
            )
        return mail

    def _find_mail_mail_wemail(self, email_to, status, mail_message=None, author=None, email_from=None):
        """ Find a mail.mail record based on various parameters, notably a list
        of email to (string emails).

        :param email_to: either matching mail.email_to value, either a mail sent
          to a single recipient whose email is email_to;

        :return mail: a ``mail.mail`` record generated during the mock and matching
          given parameters and filters;
        """
        filtered = self._filter_mail(status=status, mail_message=mail_message, author=author, email_from=email_from)
        for mail in filtered:
            if (mail.email_to == email_to and not mail.recipient_ids) or (not mail.email_to and mail.recipient_ids.email == email_to):
                break
        else:
            debug_info = '\n'.join(
                f'From: {mail.author_id} ({mail.email_from}) - To: {mail.email_to} / {sorted(mail.recipient_ids.mapped("email"))} (State: {mail.state})'
                for mail in self._new_mails
            )
            raise AssertionError(
                f'mail.mail not found for message {mail_message} / status {status} / email_to {email_to} / author {author} ({email_from})\n{debug_info}'
            )
        return mail

    def _find_mail_mail_wrecord(self, record, status=None, mail_message=None, author=None, email_from=None):
        """ Find a mail.mail record based on model / res_id of a record.

        :return mail: a ``mail.mail`` record generated during the mock;
        """
        filtered = self._filter_mail(status=status, mail_message=mail_message, author=author, email_from=email_from)
        for mail in filtered:
            if mail.model == record._name and mail.res_id == record.id:
                break
        else:
            debug_info = '\n'.join(
                f'From: {mail.author_id} ({mail.email_from}) - Model {mail.model} / ResId {mail.res_id} (State: {mail.state})'
                for mail in self._new_mails
            )
            raise AssertionError(
                f'mail.mail not found for message {mail_message} / status {status} / record {record._name}, {record.id} / author {author} ({email_from})\n{debug_info}'
            )
        return mail

    def _find_sent_email(self, email_from, emails_to, subject=None, body=None, attachment_names=None):
        """ Find an outgoing email based on from / to and optional subject, body
        and attachment names when having conflicts.

        :return sent_email: an outgoing email generated during the mock;
        """
        sent_emails = [
            mail for mail in self._mails
            if set(mail['email_to']) == set(emails_to) and mail['email_from'] == email_from
        ]
        if len(sent_emails) > 1:
            # try to better filter
            sent_email = next((mail for mail in sent_emails
                               if (subject is None or mail['subject'] == subject)
                               and (body is None or mail['body'] == body)
                               and (attachment_names is None
                                    or set(attachment_names) == set(attachment[0] for attachment in mail['attachments']))
                               ), False)
        else:
            sent_email = sent_emails[0] if sent_emails else False
        return sent_email

    # ------------------------------------------------------------
    # GATEWAY ASSERTS
    # ------------------------------------------------------------

    def _assertMailMail(self, mail, recipients_list, status,
                        email_to_recipients=None, author=None,
                        content=None, fields_values=None, email_values=None):
        """ Assert mail.mail record values and maybe related emails. Allow
        asserting their content. Records to check are the one generated when
        using mock (mail.mail and outgoing emails).

        :param mail: a ``mail.mail`` record;
        :param recipients_list: an ``res.partner`` recordset or a list of
          emails (both are supported, see ``_find_mail_mail_wpartners`` and
          ``_find_mail_mail_wemail``);
        :param status: mail.mail state used to filter mails. If ``sent`` this method
          also check that emails have been sent trough gateway;
        :param email_to_recipients: used for assertSentEmail to find email based
          on 'email_to' when doing the match directly based on recipients_list
          being partners it nos easy (e.g. multi emails, ...);
        :param author: see ``_find_mail_mail_wpartners``;
        :param content: if given, check it is contained within mail html body;
        :param fields_values: if given, should be a dictionary of field names /
          values allowing to check ``mail.mail`` additional values (subject,
          reply_to, ...);
        :param email_values: if given, should be a dictionary of keys / values
          allowing to check sent email additional values (if any).
          See ``assertSentEmail``;
        """
        self.assertTrue(bool(mail))
        if content:
            self.assertIn(content, mail.body_html)
        for fname, expected_fvalue in (fields_values or {}).items():
            with self.subTest(fname=fname, expected_fvalue=expected_fvalue):
                if fname == 'headers':
                    fvalue = literal_eval(mail[fname])
                    self.assertDictEqual(fvalue, expected_fvalue)
                else:
                    self.assertEqual(
                        mail[fname], expected_fvalue,
                        'Mail: expected %s for %s, got %s' % (expected_fvalue, fname, mail[fname])
                    )
        if status == 'sent':
            if email_to_recipients:
                recipients = email_to_recipients  # already formatted
            else:
                recipients = [[r] for r in recipients_list]  # one partner -> list of a single email
            for recipient in recipients:
                with self.subTest(recipient=recipient):
                    self.assertSentEmail(
                        email_values['email_from'] if email_values and email_values.get('email_from') else author,
                        recipient,
                        **(email_values or {})
                    )

    def assertMailMail(self, recipients, status,
                       email_to_recipients=None,
                       mail_message=None, author=None,
                       content=None, fields_values=None, email_values=None):
        """ Assert mail.mail records are created and maybe sent as emails. This
        method takes partners as source to find mails and check their content.
        See '_assertMailMail' for more details.

        :param recipients: a ``res.partner`` recordset. See
          ``_find_mail_mail_wpartners``;
        :param mail_message: used to find the related email;

        See '_assertMailMail' for more details about other parameters.
        """
        found_mail = self._find_mail_mail_wpartners(
            recipients, status, mail_message=mail_message,
            author=author, email_from=(fields_values or {}).get('email_from')
        )
        self.assertTrue(bool(found_mail))
        self._assertMailMail(
            found_mail, recipients, status,
            email_to_recipients=email_to_recipients,
            author=author, content=content,
            fields_values=fields_values, email_values=email_values,
        )
        return found_mail

    def assertMailMailWEmails(self, emails, status,
                              email_to_recipients=None,
                              mail_message=None, author=None,
                              content=None, fields_values=None, email_values=None):
        """ Assert mail.mail records are created and maybe sent as emails. This
        method takes emails as source to find mails and check their content.
        See '_assertMailMail' for more details.

        :param emails: a list of emails. See ``_find_mail_mail_wemail``;
        :param mail_message: used to find the related email;

        See '_assertMailMail' for more details about other parameters.
        """
        found_mail = False
        for email_to in emails:
            found_mail = self._find_mail_mail_wemail(
                email_to, status, mail_message=mail_message,
                author=author, email_from=(fields_values or {}).get('email_from')
            )
            self.assertTrue(bool(found_mail))
            self._assertMailMail(
                found_mail, [email_to], status,
                email_to_recipients=email_to_recipients,
                author=author, content=content,
                fields_values=fields_values, email_values=email_values,
            )
        return found_mail

    def assertMailMailWRecord(self, record, recipients, status,
                              email_to_recipients=None,
                              mail_message=None, author=None,
                              content=None, fields_values=None, email_values=None):
        """ Assert mail.mail records are created and maybe sent as emails.  This
        method takes a record as source to find mails and check their content
        using model / res_id. See '_assertMailMail' for more details.

        :param record: a record used to find emails sent related on it.
          See ``_find_mail_mail_wrecord``;
        :param mail_message: used to find the related email;

        See '_assertMailMail' for more details about other parameters.
        """
        found_mail = self._find_mail_mail_wrecord(
            record, status, mail_message=mail_message,
            author=author, email_from=(fields_values or {}).get('email_from')
        )
        self.assertTrue(bool(found_mail))
        self._assertMailMail(
            found_mail, recipients, status,
            email_to_recipients=email_to_recipients,
            author=author, content=content,
            fields_values=fields_values, email_values=email_values,
        )
        return found_mail

    def assertMailMailWId(self, mail_id, status,
                          email_to_recipients=None,
                          author=None,
                          content=None, fields_values=None, email_values=None):
        """ Assert mail.mail records are created and maybe sent as emails. Allow
        asserting their content. Records to check are the one generated when
        using mock (mail.mail and outgoing emails). This method takes partners
        as source of record fetch and assert.

        :param mail_id: a ``mail.mail`` DB ID. See ``_find_mail_mail_wid``;

        For other parameters, see ``_assertMailMail``.
        """
        found_mail = self._find_mail_mail_wid(mail_id)
        self.assertTrue(bool(found_mail))
        self._assertMailMail(
            found_mail, [],  # generally used when recipients are Falsy
            status,
            email_to_recipients=email_to_recipients,
            author=author, content=content,
            fields_values=fields_values, email_values=email_values,
        )
        return found_mail

    def assertMessageFields(self, message, fields_values):
        """ Just a quick helper to check a mail.message content by giving directly
        a dict for fields. Allows to hide a lot of assertEqual under a simple
        call with a dictionary of expected values. """
        for fname, fvalue in fields_values.items():
            with self.subTest(fname=fname, fvalue=fvalue):
                self.assertEqual(
                    message[fname], fvalue,
                    f'Message: expected {fvalue} for {fname}, got {message[fname]}',
                )

    def assertNoMail(self, recipients, mail_message=None, author=None):
        """ Check no mail.mail and email was generated during gateway mock. """
        try:
            self._find_mail_mail_wpartners(recipients, False, mail_message=mail_message, author=author)
        except AssertionError:
            pass
        else:
            raise AssertionError('mail.mail exists for message %s / recipients %s but should not exist' % (mail_message, recipients.ids))
        finally:
            self.assertNotSentEmail(recipients)

    def assertNotSentEmail(self, recipients=None):
        """Check no email was generated during gateway mock.

        :param recipients:
            List of partner for which we will check that no email have been sent
            Or list of email address
            If None, we will check that no email at all have been sent
        """
        if recipients is None:
            mails = self._mails
        else:
            all_emails = [
                email_to.email if isinstance(email_to, self.env['res.partner'].__class__)
                else email_to
                for email_to in recipients
            ]

            mails = [
                mail
                for mail in self._mails
                if any(email in all_emails for email in mail['email_to'])
            ]

        self.assertEqual(len(mails), 0)

    def assertSentEmail(self, author, recipients, **values):
        """ Tool method to ease the check of sent emails (going through the
        outgoing mail gateway, not actual <mail.mail> records).

        :param author: email author, either a string (email), either a partner
          record;
        :param recipients: list of recipients, each being either a string (email),
          either a partner record;
        :param values: dictionary of additional values to check email content;
        """
        direct_check = ['body_alternative', 'email_from', 'references', 'reply_to', 'subject']
        content_check = ['body_alternative_content', 'body_content', 'references_content']
        email_list_check = ['email_bcc', 'email_cc', 'email_to']
        other_check = ['attachments', 'attachments_info', 'body', 'headers']

        expected = {}
        for fname in direct_check + content_check + email_list_check + other_check:
            if fname in values:
                expected[fname] = values[fname]
        unknown = set(values.keys()) - set(direct_check + content_check + email_list_check + other_check)
        if unknown:
            raise NotImplementedError('Unsupported %s' % ', '.join(unknown))

        if isinstance(author, self.env['res.partner'].__class__):
            expected['email_from'] = formataddr((author.name, email_normalize(author.email, strict=False) or author.email))
        else:
            expected['email_from'] = author

        if 'email_to' in values:
            email_to_list = values['email_to']
        else:
            email_to_list = []
            for email_to in recipients:
                if isinstance(email_to, self.env['res.partner'].__class__):
                    email_to_list.append(formataddr((email_to.name, email_normalize(email_to.email, strict=False) or email_to.email)))
                else:
                    email_to_list.append(email_to)
        expected['email_to'] = email_to_list

        # fetch mail
        attachments = [attachment['name']
                       for attachment in values.get('attachments_info', [])
                       if 'name' in attachment]
        sent_mail = self._find_sent_email(
            expected['email_from'],
            expected['email_to'],
            subject=values.get('subject'),
            body=values.get('body'),
            attachment_names=attachments or None
        )
        debug_info = ''
        if not sent_mail:
            debug_info = '-'.join('From: %s-To: %s' % (mail['email_from'], mail['email_to']) for mail in self._mails)
        self.assertTrue(
            bool(sent_mail),
            'Expected mail from %s to %s not found in %s' % (expected['email_from'], expected['email_to'], debug_info)
        )

        # assert values
        for val in direct_check:
            if val in expected:
                self.assertEqual(expected[val], sent_mail[val], 'Value for %s: expected %s, received %s' % (val, expected[val], sent_mail[val]))
        if 'attachments' in expected:
            self.assertEqual(
                sorted(expected['attachments']), sorted(sent_mail['attachments']),
                'Value for %s: expected %s, received %s' % ('attachments', expected['attachments'], sent_mail['attachments'])
            )
        if 'attachments_info' in expected:
            attachments = sent_mail['attachments']
            for attachment_info in expected['attachments_info']:
                attachment = next((attach for attach in attachments if attach[0] == attachment_info['name']), False)
                self.assertTrue(
                    bool(attachment),
                    f'Attachment {attachment_info["name"]} not found in attachments',
                )
                if attachment_info.get('raw'):
                    self.assertEqual(attachment[1], attachment_info['raw'])
                if attachment_info.get('type'):
                    self.assertEqual(attachment[2], attachment_info['type'])
            self.assertEqual(len(expected['attachments_info']), len(attachments))
        if 'body' in expected:
            self.assertHtmlEqual(expected['body'], sent_mail['body'], 'Value for %s: expected %s, received %s' % ('body', expected['body'], sent_mail['body']))

        # beware to avoid list ordering differences (but Falsy values -> compare directly)
        for val in email_list_check:
            if expected.get(val):
                self.assertEqual(sorted(expected[val]), sorted(sent_mail[val]),
                                 'Value for %s: expected %s, received %s' % (val, expected[val], sent_mail[val]))
            elif val in expected:
                self.assertEqual(expected[val], sent_mail[val],
                                 'Value for %s: expected %s, received %s' % (val, expected[val], sent_mail[val]))

        # (partial) content check
        for val in content_check:
            if val in expected:
                self.assertIn(
                    expected[val], sent_mail[val[:-8]],
                    'Value for %s: %s does not contain %s' % (val, sent_mail[val[:-8]], expected[val])
                )

        if 'headers' in expected:
            for key, value in expected['headers'].items():
                self.assertTrue(key in sent_mail['headers'], f'Missing key {key}')
                found = sent_mail['headers'][key]
                self.assertEqual(found, value,
                                 f'Header value for {key} invalid, found {found} instead of {value}')
        return sent_mail


class MailCase(MockEmail):
    """ Tools, helpers and asserts for mail-related tests, including mail
    gateway mock and helpers (see ´´MockEmail´´).

    Useful reminders
        Notif type:  ('inbox', 'Inbox'), ('email', 'Email')
        Notif status: ('ready', 'Ready to Send'), ('sent', 'Sent'),
                      ('bounce', 'Bounced'), ('exception', 'Exception'),
                      ('canceled', 'Canceled')
        Notif failure type: ("SMTP", "Connection failed (outgoing mail server problem)"),
                            ("RECIPIENT", "Invalid email address"),
                            ("BOUNCE", "Email address rejected by destination"),
                            ("UNKNOWN", "Unknown error")
    """
    _test_context = {
        'mail_create_nolog': True,
        'mail_create_nosubscribe': True,
        'mail_notrack': True,
        'no_reset_password': True,
    }

    def setUp(self):
        super().setUp()
        # purpose is to avoid nondeterministic tests, notably because tracking is
        # accumulated and sent at flush -> we want to test only the result of a
        # given test, not setup + test
        self.flush_tracking()

    @classmethod
    def _reset_mail_context(cls, record):
        return record.with_context(
            mail_create_nolog=False,
            mail_create_nosubscribe=False,
            mail_notrack=False,
        )

    def flush_tracking(self):
        """ Force the creation of tracking values. """
        self.env.flush_all()
        self.cr.flush()

    # ------------------------------------------------------------
    # MAIL MOCKS
    # ------------------------------------------------------------

    @contextmanager
    def mock_bus(self):
        bus_bus_create_origin = ImBus.create
        self._init_mock_bus()

        def _bus_bus_create(model, *args, **kwargs):
            res = bus_bus_create_origin(model, *args, **kwargs)
            self._new_bus_notifs += res.sudo()
            return res

        with patch.object(ImBus, 'create', autospec=True, wraps=ImBus, side_effect=_bus_bus_create) as _bus_bus_create_mock:
            yield
            self.env.cr.precommit.run()  # trigger the creation of bus.bus records

    def _init_mock_bus(self):
        self._new_bus_notifs = self.env['bus.bus'].sudo()

    def _reset_bus(self):
        self.env.cr.precommit.run()  # trigger the creation of bus.bus records
        self.env["bus.bus"].sudo().search([]).unlink()

    @contextmanager
    def mock_mail_app(self):
        message_create_origin = Message.create
        notification_create_origin = MailNotification.create
        self._init_mock_mail()

        def _mail_message_create(model, *args, **kwargs):
            res = message_create_origin(model, *args, **kwargs)
            self._new_msgs += res.sudo()
            return res

        def _mail_notification_create(model, *args, **kwargs):
            res = notification_create_origin(model, *args, **kwargs)
            self._new_notifs += res.sudo()
            return res

        with patch.object(Message, 'create', autospec=True, wraps=Message, side_effect=_mail_message_create) as _mail_message_create_mock, \
                patch.object(MailNotification, 'create', autospec=True, wraps=MailNotification, side_effect=_mail_notification_create) as _mail_notification_create_mock:
            yield

    def _init_mock_mail(self):
        self._new_msgs = self.env['mail.message'].sudo()
        self._new_notifs = self.env['mail.notification'].sudo()

    # ------------------------------------------------------------
    # MAIL TOOLS
    # ------------------------------------------------------------

    @classmethod
    def _add_messages(cls, record, body_content, count=1, author=None, **kwargs):
        """ Helper: add #count messages in record history """
        author = author if author else cls.env.user.partner_id
        if 'email_from' not in kwargs:
            kwargs['email_from'] = author.email_formatted
        subtype_id = kwargs.get('subtype_id', cls.env.ref('mail.mt_comment').id)

        values = {
            'model': record._name,
            'res_id': record.id,
            'author_id': author.id,
            'subtype_id': subtype_id,
        }
        values.update(kwargs)

        create_vals = [dict(
            values, body='%s/%02d' % (body_content, counter))
            for counter in range(count)]

        return cls.env['mail.message'].sudo().create(create_vals)

    @classmethod
    def _create_template(cls, model, template_values=None):
        create_values = {
            'name': 'TestTemplate',
            'subject': 'About {{ object.name }}',
            'body_html': '<p>Hello <t t-out="object.name"/></p>',
            'model_id': cls.env['ir.model']._get(model).id,
        }
        if template_values:
            create_values.update(template_values)
        cls.email_template = cls.env['mail.template'].create(create_values)
        return cls.email_template


    def _generate_notify_recipients(self, partners, record=None):
        """ Tool method to generate recipients data according to structure used
        in notification methods. Purpose is to allow testing of internals of
        some notification methods, notably testing links or group-based notification
        details.

        See notably ``MailThread._notify_get_recipients()``.
        """
        return [
            {'id': partner.id,
             'active': partner.active,
             'is_follower': partner in record.message_partner_ids if record else False,
             'groups': partner.user_ids.groups_id.ids,
             'notif': partner.user_ids.notification_type or 'email',
             'share': partner.partner_share,
             'type': 'user' if partner.user_ids and not partner.partner_share else partner.user_ids and 'portal' or 'customer',
             'ushare': all(user.share for user in partner.user_ids) if partner.user_ids else False,
            } for partner in partners
        ]

    # ------------------------------------------------------------
    # MAIL ASSERTS WRAPPERS
    # ------------------------------------------------------------

    @contextmanager
    def assertSinglePostNotifications(self, recipients_info, message_info=None, mail_unlink_sent=False):
        """ Shortcut to assertMsgNotifications when having a single message to check. """
        r_info = dict(message_info if message_info else {})
        r_info.setdefault('content', '')
        r_info['notif'] = recipients_info
        with self.assertPostNotifications([r_info], mail_unlink_sent=mail_unlink_sent):
            yield

    @contextmanager
    def assertPostNotifications(self, recipients_info, mail_unlink_sent=False):
        """ Check content of notifications. """
        try:
            with self.mock_mail_gateway(mail_unlink_sent=mail_unlink_sent), self.mock_bus(), self.mock_mail_app():
                yield
        finally:
            done_msgs, done_notifs = self.assertMailNotifications(self._new_msgs, recipients_info)
            self.assertEqual(self._new_msgs, done_msgs, 'Mail: invalid message creation (%s) / expected (%s)' % (len(self._new_msgs), len(done_msgs)))
            self.assertEqual(self._new_notifs, done_notifs, 'Mail: invalid notification creation (%s) / expected (%s)' % (len(self._new_notifs), len(done_notifs)))

    @contextmanager
    def assertBus(self, channels, message_items=None):
        """ Check content of bus notifications. """
        try:
            with self.mock_bus():
                yield
        finally:
            found_bus_notifs = self.assertBusNotifications(channels, message_items=message_items)
            self.assertEqual(self._new_bus_notifs, found_bus_notifs)

    @contextmanager
    def assertMsgWithoutNotifications(self, mail_unlink_sent=False):
        try:
            with self.mock_mail_gateway(mail_unlink_sent=mail_unlink_sent), self.mock_bus(), self.mock_mail_app():
                yield
        finally:
            self.assertTrue(self._new_msgs)
            self.assertFalse(bool(self._new_notifs))
            self.assertFalse(bool(self._new_mails))
            self.assertFalse(bool(self._mails))

    @contextmanager
    def assertNoNotifications(self):
        try:
            with self.mock_mail_gateway(mail_unlink_sent=False), self.mock_bus(), self.mock_mail_app():
                yield
        finally:
            self.assertFalse(bool(self._new_msgs))
            self.assertFalse(bool(self._new_notifs))

    # ------------------------------------------------------------
    # MAIL MODELS ASSERTS
    # ------------------------------------------------------------

    def assertMailNotifications(self, messages, recipients_info):
        """ Check bus notifications content. Mandatory and basic check is about
        channels being notified. Content check is optional.

        GENERATED INPUT
        :param <mail.message> messages: generated messages to check, coming
          notably from the 'self._new_msgs' filled during the mock;

        EXPECTED
        :param list recipients_info: list of data dict: [
          {
            # message values
            'content': message content that should be present in message 'body'
              field;
            'message_type': 'message_type' value (default: 'comment'),
            'subtype': xml id of message subtype (default: 'mail.mt_comment'),
            # notifications values
            'email_values': values to check in outgoing emails, check 'assertMailMail'
              and 'assertSentEmail';
            'mail_mail_values': values to check in generated <mail.mail>, check
              'assertMailMail'. 'fields_values' is supported for compabitility
              with other asserts;
            'message_values': values to check in found <mail.message>, check
              'assertMessageFields';
            'notif': list of notified recipients: [
              {
                'check_send': whether outgoing stuff has to be checked;
                'email': NOT SUPPORTED YET,
                'failure_reason': failure_reason on mail.notification;
                'failure_type': 'failure_type' on mail.notification;
                'is_read': 'is_read' on mail.notification;
                'partner': res.partner record (may be empty),
                'status': 'notification_status' on mail.notification;
                'type': 'notification_type' on mail.notification;
              },
              { ... }
            ],
          },
          {...}
        ]

        PARAMETERS
        :param mail_unlink_sent: mock parameter, tells if mails are unlinked
          and therefore we are able to check outgoing emails;
        """
        partners = self.env['res.partner'].sudo().concat(*list(p['partner'] for i in recipients_info for p in i['notif'] if p.get('partner')))
        base_domain = [('res_partner_id', 'in', partners.ids)]
        if messages is not None:
            base_domain += [('mail_message_id', 'in', messages.ids)]
        notifications = self.env['mail.notification'].sudo().search(base_domain)

        done_msgs = self.env['mail.message'].sudo()
        done_notifs = self.env['mail.notification'].sudo()

        for message_info in recipients_info:
            # sanity check
            extra_keys = set(message_info.keys()) - {
                'content',
                'email_values',
                'fields_values',
                'mail_mail_values',
                'message_type',
                'message_values',
                'notif',
                'subtype',
            }
            if extra_keys:
                raise ValueError(f'Unsupported values: {extra_keys}')

            mbody, mtype = message_info.get('content', ''), message_info.get('message_type', 'comment')
            msubtype = self.env.ref(message_info.get('subtype', 'mail.mt_comment'))

            # find message
            if messages:
                message = messages.filtered(lambda message: (
                    mbody in message.body and message.message_type == mtype and
                    message.subtype_id == msubtype
                ))
            else:
                message = self.env['mail.message'].sudo().search([
                    ('body', 'ilike', mbody),
                    ('message_type', '=', mtype),
                    ('subtype_id', '=', msubtype.id)
                ], limit=1, order='id DESC')
            self.assertTrue(message, 'Mail: not found message (content: %s, message_type: %s, subtype: %s)' % (mbody, mtype, msubtype.name))

            # check message values
            message_values = message_info.get('message_values', {})
            if message_values:
                self.assertMessageFields(message, message_values)

            # check notifications and prepare assert data
            email_groups = defaultdict(list)
            mail_groups = {'failure': [], 'outgoing': []}
            for recipient in message_info['notif']:
                partner, ntype, ngroup, nstatus = recipient['partner'], recipient['type'], recipient.get('group'), recipient.get('status', 'sent')
                nis_read, ncheck_send = recipient.get('is_read', False if recipient['type'] == 'inbox' else True), recipient.get('check_send', True)
                if not ngroup:
                    ngroup = 'user'
                    if partner and not partner.user_ids:
                        ngroup = 'customer'
                    elif partner and partner.partner_share:
                        ngroup = 'portal'

                # find notification
                partner_notif = notifications.filtered(
                    lambda n: n.mail_message_id == message and
                    n.res_partner_id == partner and
                    n.notification_type == ntype
                )
                self.assertEqual(len(partner_notif), 1,
                                 f'Mail: not found notification for {partner} (type: {ntype}, message: {message.id})')
                self.assertEqual(partner_notif.author_id, partner_notif.mail_message_id.author_id)
                self.assertEqual(partner_notif.is_read, nis_read)
                if 'failure_reason' in recipient:
                    self.assertEqual(partner_notif.failure_reason, recipient['failure_reason'])
                if 'failure_type' in recipient:
                    self.assertEqual(partner_notif.failure_type, recipient['failure_type'])
                self.assertEqual(partner_notif.notification_status, nstatus)

                # prepare further asserts
                if ntype == 'email':
                    if nstatus == 'sent':
                        if ncheck_send:
                            email_groups[ngroup].append(partner)
                    # when force_send is False notably, notifications are ready and emails outgoing
                    elif nstatus == 'ready':
                        mail_groups['outgoing'].append(partner)
                        if ncheck_send:
                            email_groups[ngroup].append(partner)
                    # canceled: currently nothing checked
                    elif nstatus == 'exception':
                        mail_groups['failure'].append(partner)
                        if ncheck_send:
                            email_groups[ngroup].append(partner)
                    # canceled: currently nothing checked
                    elif nstatus == 'canceled':
                        pass
                    else:
                        raise NotImplementedError()

                done_notifs |= partner_notif
            done_msgs |= message

            # check bus notifications that should be sent (hint: message author, multiple notifications)
            bus_notifications = message.notification_ids._filtered_for_web_client().filtered(lambda n: n.notification_status == 'exception')
            if bus_notifications:
                self.assertMessageBusNotifications(message)

            # check emails that should be sent (hint: mail.mail per group, email par recipient)
            email_values = {
                'body_content': mbody,
                'references_content': message.message_id,
            }
            if message_info.get('email_values'):
                email_values.update(message_info['email_values'])
            for recipients in email_groups.values():
                partners = self.env['res.partner'].sudo().concat(*recipients)
                if all(p in mail_groups['failure'] for p in partners):
                    mail_status = 'exception'
                elif all(p in mail_groups['outgoing'] for p in partners):
                    mail_status = 'outgoing'
                else:
                    mail_status = 'sent'
                if not self.mail_unlink_sent:
                    self.assertMailMail(
                        partners, mail_status,
                        author=message_info.get('fields_values', {}).get('author_id') or message.author_id or message.email_from,
                        mail_message=message,
                        email_values=email_values,
                        fields_values=message_info.get('fields_values') or message_info.get('mail_mail_values'),
                    )
                else:
                    for recipient in partners:
                        self.assertSentEmail(
                            message.author_id if message.author_id else message.email_from,
                            [recipient],
                            **email_values
                        )

            if not any(p for recipients in email_groups.values() for p in recipients):
                self.assertNoMail(partners, mail_message=message, author=message.author_id)

        return done_msgs, done_notifs

    def assertMessageBusNotifications(self, message):
        """Asserts that the expected notification updates have been sent on the
        bus for the given message."""
        self.assertBusNotifications([(self.cr.dbname, 'res.partner', message.author_id.id)], [{
            'type': 'mail.message/notification_update',
            'payload': {
                'elements': message._message_notification_format(),
            },
        }], check_unique=False)

    def assertBusNotifications(self, channels, message_items=None, check_unique=True):
        """ Check bus notifications content. Mandatory and basic check is about
        channels being notified. Content check is optional.

        EXPECTED
        :param channels: list of expected bus channels, like [
          (self.cr.dbname, 'res.partner', self.partner_employee_2.id)
        ]
        :param message_items: if given, list of expected message making a valid
          pair (channel, message) to be found in bus.bus, like [
            {'type': 'mail.message/notification_update',
             'elements': {self.msg.id: {
                'message_id': self.msg.id,
                'message_type': 'sms',
                'notifications': {...},
                ...
              }}
            }, {...}]
        """
        self.env.cr.precommit.run()  # trigger the creation of bus.bus records
        bus_notifs = self.env['bus.bus'].sudo().search([('channel', 'in', [json_dump(channel) for channel in channels])])
        self.assertEqual(set(bus_notifs.mapped('channel')), set([json_dump(channel) for channel in channels]))
        notif_messages = [n.message for n in bus_notifs]
        for expected in message_items or []:
            for notification in notif_messages:
                if json_dump(expected) == notification:
                    break
            else:
                raise AssertionError('No notification was found with the expected value.\nExpected:\n%s\nReturned:\n%s' %
                    (json_dump(expected), '\n'.join([n for n in notif_messages])))
        if check_unique:
            self.assertEqual(len(bus_notifs), len(channels))
        return bus_notifs

    def assertNotified(self, message, recipients_info, is_complete=False):
        """ Lightweight check for notifications (mail.notification).

        :param recipients_info: list notified recipients: [
          {'partner': res.partner record (may be empty),
           'type': notification_type to check,
           'is_read': is_read to check,
          }, {...}]
        """
        notifications = self._new_notifs.filtered(lambda notif: notif in message.notification_ids)
        if is_complete:
            self.assertEqual(len(notifications), len(recipients_info))
        for rinfo in recipients_info:
            recipient_notif = next(
                (notif
                 for notif in notifications
                 if notif.res_partner_id == rinfo['partner']
                ), False
            )
            self.assertTrue(recipient_notif)
            self.assertEqual(recipient_notif.is_read, rinfo['is_read'])
            self.assertEqual(recipient_notif.notification_type, rinfo['type'])

    def assertTracking(self, message, data, strict=False):
        tracking_values = message.sudo().tracking_value_ids
        if strict:
            self.assertEqual(len(tracking_values), len(data),
                             'Tracking: tracking does not match')

        suffix_mapping = {
            'boolean': 'integer',
            'char': 'char',
            'date': 'datetime',
            'datetime': 'datetime',
            'integer': 'integer',
            'float': 'float',
            'many2many': 'char',
            'one2many': 'char',
            'selection': 'char',
            'text': 'text',
        }
        for field_name, value_type, old_value, new_value in data:
            tracking = tracking_values.filtered(lambda track: track.field_id.name == field_name)
            self.assertEqual(len(tracking), 1, f'Tracking: not found for {field_name}')
            msg_base = f'Tracking: {field_name} ({value_type}: '
            if value_type in suffix_mapping:
                old_value_fname = f'old_value_{suffix_mapping[value_type]}'
                new_value_fname = f'new_value_{suffix_mapping[value_type]}'
                self.assertEqual(tracking[old_value_fname], old_value,
                                 msg_base + f'expected {old_value}, received {tracking[old_value_fname]})')
                self.assertEqual(tracking[new_value_fname], new_value,
                                 msg_base + f'expected {new_value}, received {tracking[new_value_fname]})')
            if value_type == 'many2one':
                self.assertEqual(tracking.old_value_integer, old_value and old_value.id or False)
                self.assertEqual(tracking.new_value_integer, new_value and new_value.id or False)
                self.assertEqual(tracking.old_value_char, old_value and old_value.display_name or '')
                self.assertEqual(tracking.new_value_char, new_value and new_value.display_name or '')
            elif value_type == 'monetary':
                new_value, currency = new_value
                self.assertEqual(tracking.currency_id, currency)
                self.assertEqual(tracking.old_value_float, old_value)
                self.assertEqual(tracking.new_value_float, new_value)
            if value_type not in suffix_mapping and value_type not in {'many2one', 'monetary'}:
                self.assertEqual(1, 0, f'Tracking: unsupported tracking test on {value_type}')


class MailCommon(common.TransactionCase, MailCase):
    """ Almost-void class definition setting the savepoint case + mock of mail.
    Used mainly for class inheritance in other applications and test modules. """

    @classmethod
    def setUpClass(cls):
        super(MailCommon, cls).setUpClass()
        # ensure admin configuration
        cls.user_admin = cls.env.ref('base.user_admin')
        cls.partner_admin = cls.env.ref('base.partner_admin')
        cls.company_admin = cls.user_admin.company_id
        cls.company_admin.write({
            'country_id': cls.env.ref("base.be").id,
            'email': 'your.company@example.com',  # ensure email for various fallbacks
            'name': 'YourTestCompany',  # force for reply_to computation
        })
        with patch.object(Users, '_notify_security_setting_update', side_effect=lambda *args, **kwargs: None):
            cls.user_admin.write({
                'country_id': cls.env.ref('base.be').id,
                'email': 'test.admin@test.example.com',
                'notification_type': 'inbox',
            })
        # have root available at hand, just in case
        cls.user_root = cls.env.ref('base.user_root')
        cls.partner_root = cls.user_root.partner_id

        # setup MC environment
        cls._activate_multi_company()

        # give default values for all email aliases and domain
        cls._init_mail_gateway()
        cls._init_mail_servers()

        # by default avoid rendering restriction complexity
        cls.env['ir.config_parameter'].set_param('mail.restrict.template.rendering', False)

        # test standard employee
        cls.user_employee = mail_new_test_user(
            cls.env,
            company_id=cls.company_admin.id,
            country_id=cls.env.ref('base.be').id,
            groups='base.group_user,mail.group_mail_template_editor',
            login='employee',
            name='Ernest Employee',
            notification_type='inbox',
            signature='--\nErnest'
        )
        cls.partner_employee = cls.user_employee.partner_id

    @classmethod
    def _create_portal_user(cls):
        cls.user_portal = mail_new_test_user(
            cls.env, login='portal_test', groups='base.group_portal', company_id=cls.company_admin.id,
            name='Chell Gladys', notification_type='email')
        cls.partner_portal = cls.user_portal.partner_id
        return cls.user_portal

    @classmethod
    def _create_records_for_batch(cls, model, count, additional_values=None, prefix=''):
        additional_values = additional_values or {}
        records = cls.env[model]
        partners = cls.env['res.partner']
        country_id = cls.env.ref('base.be').id

        base_values = [
            {'name': f'{prefix}Test_{idx}',
             **additional_values,
            } for idx in range(count)
        ]

        partner_fnames = cls.env[model]._mail_get_partner_fields(introspect_fields=True)
        if partner_fname := partner_fnames[0] if partner_fnames else False:
            partners = cls.env['res.partner'].with_context(**cls._test_context).create([{
                'name': f'Partner_{idx}',
                'email': f'{prefix}test_partner_{idx}@example.com',
                'country_id': country_id,
                'mobile': '047500%02d%02d' % (idx, idx)
            } for idx in range(count)])
            for values, partner in zip(base_values, partners):
                values[partner_fname] = partner.id

        records = cls.env[model].with_context(**cls._test_context).create(base_values)

        cls.records = cls._reset_mail_context(records)
        cls.partners = partners
        return cls.records, cls.partners

    @classmethod
    def _activate_multi_company(cls):
        """ Create another company, add it to admin and create an user that
        belongs to that new company. It allows to test flows with users from
        different companies. """
        cls._mc_enabled = True

        # new companies
        cls.company_2 = cls.env['res.company'].create({
            'currency_id': cls.env.ref('base.CAD').id,
            'email': 'company_2@test.example.com',
            'name': 'Company 2',
        })
        cls.company_3 = cls.env['res.company'].create({
            'country_id': cls.env.ref('base.be').id,
            'currency_id': cls.env.ref('base.EUR').id,
            'email': 'company_3@test.example.com',
            'name': 'Company 3',
        })
        cls.user_admin.write({
            'company_ids': [
                (4, cls.company_2.id),
                (4, cls.company_3.id),
            ],
        })

        # employee specific to second company
        cls.user_employee_c2 = mail_new_test_user(
            cls.env, login='employee_c2',
            groups='base.group_user',
            company_id=cls.company_2.id,
            company_ids=[(4, cls.company_2.id)],
            email='enguerrand@example.com',
            name='Enguerrand Employee C2',
            notification_type='inbox',
            signature='--\nEnguerrand'
        )
        cls.partner_employee_c2 = cls.user_employee_c2.partner_id

        # test erp manager employee
        cls.user_erp_manager = mail_new_test_user(
            cls.env,
            company_id=cls.company_2.id,
            company_ids=[(6, 0, (cls.company_admin + cls.company_2).ids)],
            email='etchenne@example.com',
            groups='base.group_user,base.group_erp_manager,mail.group_mail_template_editor,base.group_partner_manager',
            login='erp_manager',
            name='Etchenne Tchagada',
            notification_type='inbox',
            signature='--\nEtchenne',
        )

    @classmethod
    def _activate_multi_lang(cls, lang_code='es_ES', layout_arch_db=None, test_record=False, test_template=False):
        """ Summary of es_ES matching done here (a bit hardcoded to ease tests)

          * layout
            * 'English Layout for' -> Spanish Layout para
          * model
            * description: English:    Lang Chatter Model (depends on test_record._name)
                           translated: Spanish Model Description
          * module
            * _('NotificationButtonTitle') -> SpanishNotificationButtonTitle (used as link button name in layout)
            * _('View %s') -> SpanishView %s
          * template
            * body: English:    <p>EnglishBody for <t t-out="object.name"/></p> (depends on test_template.body)
                    translated: <p>SpanishBody for <t t-out="object.name" /></p>
            * subject: English:    EnglishSubject for {{ object.name }} (depends on test_template.subject)
                       translated: SpanishSubject for {{ object.name }}
        """
        # activate translations
        cls.env['res.lang']._activate_lang(lang_code)
        with mute_logger("odoo.addons.base.models.ir_module", "odoo.tools.translate"):
            cls.env.ref('base.module_base')._update_translations([lang_code])
            cls.env.ref('base.module_mail')._update_translations([lang_code])
            cls.env.ref('base.module_test_mail')._update_translations([lang_code])
            code_translations.get_python_translations('mail', lang_code)
            code_translations.get_python_translations('test_mail', lang_code)

        # Make sure Spanish translations have not been altered
        if test_record:
            cls.env['ir.model']._get(test_record._name).with_context(lang=lang_code).name = 'Spanish Model Description'

        # Translate some code strings used in mailing
        code_translations.python_translations[('test_mail', 'es_ES')]['NotificationButtonTitle'] = 'SpanishButtonTitle'
        cls.addClassCleanup(code_translations.python_translations[('test_mail', 'es_ES')].pop, 'NotificationButtonTitle')
        code_translations.python_translations[('mail', 'es_ES')]['View %s'] = 'SpanishView %s'
        cls.addClassCleanup(code_translations.python_translations[('mail', 'es_ES')].pop, 'View %s')

        # Prepare some translated value for template if given
        if test_template:
            test_template.with_context(lang=lang_code).subject = 'SpanishSubject for {{ object.name }}'
            test_template.with_context(lang=lang_code).body_html = '<p>SpanishBody for <t t-out="object.name" /></p>'

        # create a custom layout for email notification
        if not layout_arch_db:
            layout_arch_db = """
<body>
    <p>English Layout for <t t-esc="model_description"/></p>
    <img t-att-src="'/logo.png?company=%s' % (company.id or 0)" t-att-alt="'%s' % company.name"/>
    <a t-if="has_button_access" t-att-href="button_access['url']">
        <t t-esc="button_access['title']"/>
    </a>
    <t t-if="actions">
        <t t-foreach="actions" t-as="action">
            <a t-att-href="action['url']">
                <t t-esc="action['title']"/>
            </a>
        </t>
    </t>
    <t t-out="message.body"/>
    <ul t-if="tracking_values">
        <li t-foreach="tracking_values" t-as="tracking">
            <t t-esc="tracking[0]"/>: <t t-esc="tracking[1]"/> -&gt; <t t-esc="tracking[2]"/>
        </li>
    </ul>
    <div t-if="signature" t-out="signature"/>
    <p>Sent by <t t-esc="company.name"/></p>
</body>"""
        view = cls.env['ir.ui.view'].create({
            'arch_db': layout_arch_db,
            'key': 'test_layout',
            'name': 'test_layout',
            'type': 'qweb',
        })
        cls.env['ir.model.data'].create({
            'model': 'ir.ui.view',
            'module': 'mail',
            'name': 'test_layout',
            'res_id': view.id
        })
        view.update_field_translations('arch_db', {
            lang_code: {
                'English Layout for': 'Spanish Layout para'
            }
        })

    @staticmethod
    def _generate_attachments_data(count, res_model, res_id, attach_values=None, prefix=None):
        # attachment visibility depends on what they are attached to
        attach_values = attach_values or {}
        prefix = prefix or ''
        return [{
            'datas': base64.b64encode(b'AttContent_%02d' % x),
            'name': f'{prefix}AttFileName_{x:02d}.txt',
            'mimetype': 'text/plain',
            'res_model': res_model,
            'res_id': res_id,
            **attach_values,
        } for x in range(count)]
