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diff --git a/addons/website_event/models/event_event.py b/addons/website_event/models/event_event.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import json
+import werkzeug.urls
+
+from pytz import utc
+
+from odoo import api, fields, models, _
+from odoo.addons.http_routing.models.ir_http import slug
+from odoo.osv import expression
+
+GOOGLE_CALENDAR_URL = 'https://www.google.com/calendar/render?'
+
+
+class Event(models.Model):
+    _name = 'event.event'
+    _inherit = [
+        'event.event',
+        'website.seo.metadata',
+        'website.published.multi.mixin',
+        'website.cover_properties.mixin'
+    ]
+
+    def _default_cover_properties(self):
+        res = super()._default_cover_properties()
+        res['opacity'] = '0.4'
+        return res
+
+    # description
+    subtitle = fields.Char('Event Subtitle', translate=True)
+    # registration
+    is_participating = fields.Boolean("Is Participating", compute="_compute_is_participating")
+    # website
+    website_published = fields.Boolean(tracking=True)
+    website_menu = fields.Boolean(
+        string='Website Menu',
+        compute='_compute_website_menu', readonly=False, store=True,
+        help="Creates menus Introduction, Location and Register on the page "
+             "of the event on the website.")
+    menu_id = fields.Many2one('website.menu', 'Event Menu', copy=False)
+    menu_register_cta = fields.Boolean(
+        'Add Register Button', compute='_compute_menu_register_cta',
+        readonly=False, store=True)
+    community_menu = fields.Boolean(
+        "Community Menu", compute="_compute_community_menu",
+        readonly=False, store=True,
+        help="Display community tab on website")
+    community_menu_ids = fields.One2many(
+        "website.event.menu", "event_id", string="Event Community Menus",
+        domain=[("menu_type", "=", "community")])
+    # live information
+    is_ongoing = fields.Boolean(
+        'Is Ongoing', compute='_compute_time_data', search='_search_is_ongoing',
+        help="Whether event has begun")
+    is_done = fields.Boolean(
+        'Is Done', compute='_compute_time_data',
+        help="Whether event is finished")
+    start_today = fields.Boolean(
+        'Start Today', compute='_compute_time_data',
+        help="Whether event is going to start today if still not ongoing")
+    start_remaining = fields.Integer(
+        'Remaining before start', compute='_compute_time_data',
+        help="Remaining time before event starts (minutes)")
+
+    def _compute_is_participating(self):
+        """Heuristic
+
+          * public, no visitor: not participating as we have no information;
+          * public and visitor: check visitor is linked to a registration. As
+            visitors are merged on the top parent, current visitor check is
+            sufficient even for successive visits;
+          * logged, no visitor: check partner is linked to a registration. Do
+            not check the email as it is not really secure;
+          * logged as visitor: check partner or visitor are linked to a
+            registration;
+        """
+        current_visitor = self.env['website.visitor']._get_visitor_from_request(force_create=False)
+        if self.env.user._is_public() and not current_visitor:
+            events = self.env['event.event']
+        elif self.env.user._is_public():
+            events = self.env['event.registration'].sudo().search([
+                ('event_id', 'in', self.ids),
+                ('state', '!=', 'cancel'),
+                ('visitor_id', '=', current_visitor.id),
+            ]).event_id
+        else:
+            if current_visitor:
+                domain = [
+                    '|',
+                    ('partner_id', '=', self.env.user.partner_id.id),
+                    ('visitor_id', '=', current_visitor.id)
+                ]
+            else:
+                domain = [('partner_id', '=', self.env.user.partner_id.id)]
+            events = self.env['event.registration'].sudo().search(
+                expression.AND([
+                    domain,
+                    ['&', ('event_id', 'in', self.ids), ('state', '!=', 'cancel')]
+                ])
+            ).event_id
+
+        for event in self:
+            event.is_participating = event in events
+
+    @api.depends('event_type_id')
+    def _compute_website_menu(self):
+        """ Also ensure a value for website_menu as it is a trigger notably for
+        track related menus. """
+        for event in self:
+            if event.event_type_id and event.event_type_id != event._origin.event_type_id:
+                event.website_menu = event.event_type_id.website_menu
+            elif not event.website_menu:
+                event.website_menu = False
+
+    @api.depends("event_type_id", "website_menu", "community_menu")
+    def _compute_community_menu(self):
+        """ Set False in base module. Sub modules will add their own logic
+        (meet or track_quiz). """
+        for event in self:
+            event.community_menu = False
+
+    @api.depends("event_type_id", "website_menu")
+    def _compute_menu_register_cta(self):
+        """ At type onchange: synchronize. At website_menu update: synchronize. """
+        for event in self:
+            if event.event_type_id and event.event_type_id != event._origin.event_type_id:
+                event.menu_register_cta = event.event_type_id.menu_register_cta
+            elif event.website_menu and (event.website_menu != event._origin.website_menu or not event.menu_register_cta):
+                event.menu_register_cta = True
+            elif not event.website_menu:
+                event.menu_register_cta = False
+
+    @api.depends('date_begin', 'date_end')
+    def _compute_time_data(self):
+        """ Compute start and remaining time. Do everything in UTC as we compute only
+        time deltas here. """
+        now_utc = utc.localize(fields.Datetime.now().replace(microsecond=0))
+        for event in self:
+            date_begin_utc = utc.localize(event.date_begin, is_dst=False)
+            date_end_utc = utc.localize(event.date_end, is_dst=False)
+            event.is_ongoing = date_begin_utc <= now_utc <= date_end_utc
+            event.is_done = now_utc > date_end_utc
+            event.start_today = date_begin_utc.date() == now_utc.date()
+            if date_begin_utc >= now_utc:
+                td = date_begin_utc - now_utc
+                event.start_remaining = int(td.total_seconds() / 60)
+            else:
+                event.start_remaining = 0
+
+    @api.depends('name')
+    def _compute_website_url(self):
+        super(Event, self)._compute_website_url()
+        for event in self:
+            if event.id:  # avoid to perform a slug on a not yet saved record in case of an onchange.
+                event.website_url = '/event/%s' % slug(event)
+
+    # ------------------------------------------------------------
+    # CRUD
+    # ------------------------------------------------------------
+
+    @api.model
+    def create(self, vals):
+        res = super(Event, self).create(vals)
+        res._update_website_menus()
+        return res
+
+    def write(self, vals):
+        menus_state_by_field = self._split_menus_state_by_field()
+        res = super(Event, self).write(vals)
+        menus_update_by_field = self._get_menus_update_by_field(menus_state_by_field, force_update=vals.keys())
+        self._update_website_menus(menus_update_by_field=menus_update_by_field)
+        return res
+
+    # ------------------------------------------------------------
+    # WEBSITE MENU MANAGEMENT
+    # ------------------------------------------------------------
+
+    def toggle_website_menu(self, val):
+        self.website_menu = val
+
+    def _get_menu_update_fields(self):
+        """" Return a list of fields triggering a split of menu to activate /
+        menu to de-activate. Due to saas-13.3 improvement of menu management
+        this is done using side-methods to ease inheritance.
+
+        :return list: list of fields, each of which triggering a menu update
+          like website_menu, website_track, ... """
+        return ['website_menu', 'community_menu']
+
+    def _get_menu_type_field_matching(self):
+        return {'community': 'community_menu'}
+
+    def _split_menus_state_by_field(self):
+        """ For each field linked to a menu, get the set of events having this
+        menu activated and de-activated. Purpose is to find those whose value
+        changed and update the underlying menus.
+
+        :return dict: key = name of field triggering a website menu update, get {
+          'activated': subset of self having its menu currently set to True
+          'deactivated': subset of self having its menu currently set to False
+        } """
+        menus_state_by_field = dict()
+        for fname in self._get_menu_update_fields():
+            activated = self.filtered(lambda event: event[fname])
+            menus_state_by_field[fname] = {
+                'activated': activated,
+                'deactivated': self - activated,
+            }
+        return menus_state_by_field
+
+    def _get_menus_update_by_field(self, menus_state_by_field, force_update=None):
+        """ For each field linked to a menu, get the set of events requiring
+        this menu to be activated or de-activated based on previous recorded
+        value.
+
+        :param menus_state_by_field: see ``_split_menus_state_by_field``;
+        :param force_update: list of field to which we force update of menus. This
+          is used notably when a direct write to a stored editable field messes with
+          its pre-computed value, notably in a transient mode (aka demo for example);
+
+        :return dict: key = name of field triggering a website menu update, get {
+          'activated': subset of self having its menu toggled to True
+          'deactivated': subset of self having its menu toggled to False
+        } """
+        menus_update_by_field = dict()
+        for fname in self._get_menu_update_fields():
+            if fname in force_update:
+                menus_update_by_field[fname] = self
+            else:
+                menus_update_by_field[fname] = self.env['event.event']
+                menus_update_by_field[fname] |= menus_state_by_field[fname]['activated'].filtered(lambda event: not event[fname])
+                menus_update_by_field[fname] |= menus_state_by_field[fname]['deactivated'].filtered(lambda event: event[fname])
+        return menus_update_by_field
+
+    def _get_website_menu_entries(self):
+        """ Method returning menu entries to display on the website view of the
+        event, possibly depending on some options in inheriting modules.
+
+        Each menu entry is a tuple containing :
+          * name: menu item name
+          * url: if set, url to a route (do not use xml_id in that case);
+          * xml_id: template linked to the page (do not use url in that case);
+          * sequence: specific sequence of menu entry to be set on the menu;
+          * menu_type: type of menu entry (used in inheriting modules to ease
+            menu management; not used in this module in 13.3 due to technical
+            limitations);
+        """
+        self.ensure_one()
+        return [
+            (_('Introduction'), False, 'website_event.template_intro', 1, False),
+            (_('Location'), False, 'website_event.template_location', 50, False),
+            (_('Register'), '/event/%s/register' % slug(self), False, 100, False),
+        ]
+
+    def _get_community_menu_entries(self):
+        self.ensure_one()
+        return [(_('Community'), '/event/%s/community' % slug(self), False, 80, 'community')]
+
+    def _update_website_menus(self, menus_update_by_field=None):
+        """ Synchronize event configuration and its menu entries for frontend.
+
+        :param menus_update_by_field: see ``_get_menus_update_by_field``"""
+        for event in self:
+            if event.menu_id and not event.website_menu:
+                event.menu_id.sudo().unlink()
+            elif event.website_menu and not event.menu_id:
+                root_menu = self.env['website.menu'].sudo().create({'name': event.name, 'website_id': event.website_id.id})
+                event.menu_id = root_menu
+            if event.website_menu and (not menus_update_by_field or event in menus_update_by_field.get('website_menu')):
+                for name, url, xml_id, menu_sequence, menu_type in event._get_website_menu_entries():
+                    event._create_menu(menu_sequence, name, url, xml_id, menu_type=menu_type)
+            if event.menu_id and (not menus_update_by_field or event in menus_update_by_field.get('community_menu')):
+                event._update_website_menu_entry('community_menu', 'community_menu_ids', '_get_community_menu_entries')
+
+    def _update_website_menu_entry(self, fname_bool, fname_o2m, method_name):
+        """ Generic method to create menu entries based on a flag on event. This
+        method is a bit obscure, but is due to preparation of adding new menus
+        entries and pages for event in a stable version, leading to some constraints
+        while developing.
+
+        :param fname_bool: field name (e.g. website_track)
+        :param fname_o2m: o2m linking towards website.event.menu matching the
+          boolean fields (normally an entry ot website.event.menu with type matching
+          the boolean field name)
+        :param method_name: method returning menu entries information: url, sequence, ...
+        """
+        self.ensure_one()
+        new_menu = None
+
+        if self[fname_bool] and not self[fname_o2m]:
+            # menus not found but boolean True: get menus to create
+            for sequence, menu_data in enumerate(getattr(self, method_name)()):
+                # some modules have 4 data: name, url, xml_id, menu_type; however we
+                # plan to support sequence in future modules, so this hackish code is
+                # necessary to avoid crashing. Not nice, but stable target = meh.
+                if len(menu_data) == 4:
+                    (name, url, xml_id, menu_type) = menu_data
+                    menu_sequence = sequence
+                elif len(menu_data) == 5:
+                    (name, url, xml_id, menu_sequence, menu_type) = menu_data
+                new_menu = self._create_menu(menu_sequence, name, url, xml_id, menu_type=menu_type)
+        elif not self[fname_bool]:
+            # will cascade delete to the website.event.menu
+            self[fname_o2m].mapped('menu_id').sudo().unlink()
+
+        return new_menu
+
+    def _create_menu(self, sequence, name, url, xml_id, menu_type=False):
+        """ If url: create a website menu. Menu leads directly to the URL that
+        should be a valid route. If xml_id: create a new page, take its url back
+        thanks to new_page of website, then link it to a menu. Template is
+        duplicated and linked to a new url, meaning each menu will have its own
+        copy of the template.
+
+        :param menu_type: type of menu. Mainly used for inheritance purpose
+          allowing more fine-grain tuning of menus. """
+        if not url:
+            self.env['ir.ui.view'].with_context(_force_unlink=True).search([('name', '=', name + ' ' + self.name)]).unlink()
+            page_result = self.env['website'].sudo().new_page(name + ' ' + self.name, template=xml_id, ispage=False)
+            url = "/event/" + slug(self) + "/page" + page_result['url']  # url contains starting "/"
+        website_menu = self.env['website.menu'].sudo().create({
+            'name': name,
+            'url': url,
+            'parent_id': self.menu_id.id,
+            'sequence': sequence,
+            'website_id': self.website_id.id,
+        })
+        if menu_type:
+            self.env['website.event.menu'].create({
+                'menu_id': website_menu.id,
+                'event_id': self.id,
+                'menu_type': menu_type,
+            })
+        return website_menu
+
+    # ------------------------------------------------------------
+    # TOOLS
+    # ------------------------------------------------------------
+
+    def google_map_link(self, zoom=8):
+        """ Temporary method for stable """
+        return self._google_map_link(zoom=zoom)
+
+    def _google_map_link(self, zoom=8):
+        self.ensure_one()
+        if self.address_id:
+            return self.sudo().address_id.google_map_link(zoom=zoom)
+        return None
+
+    def _track_subtype(self, init_values):
+        self.ensure_one()
+        if 'is_published' in init_values and self.is_published:
+            return self.env.ref('website_event.mt_event_published')
+        elif 'is_published' in init_values and not self.is_published:
+            return self.env.ref('website_event.mt_event_unpublished')
+        return super(Event, self)._track_subtype(init_values)
+
+    def action_open_badge_editor(self):
+        """ open the event badge editor : redirect to the report page of event badge report """
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.act_url',
+            'target': 'new',
+            'url': '/report/html/%s/%s?enable_editor' % ('event.event_event_report_template_badge', self.id),
+        }
+
+    def _get_event_resource_urls(self):
+        url_date_start = self.date_begin.strftime('%Y%m%dT%H%M%SZ')
+        url_date_stop = self.date_end.strftime('%Y%m%dT%H%M%SZ')
+        params = {
+            'action': 'TEMPLATE',
+            'text': self.name,
+            'dates': url_date_start + '/' + url_date_stop,
+            'details': self.name,
+        }
+        if self.address_id:
+            params.update(location=self.sudo().address_id.contact_address.replace('\n', ' '))
+        encoded_params = werkzeug.urls.url_encode(params)
+        google_url = GOOGLE_CALENDAR_URL + encoded_params
+        iCal_url = '/event/%d/ics?%s' % (self.id, encoded_params)
+        return {'google_url': google_url, 'iCal_url': iCal_url}
+
+    def _default_website_meta(self):
+        res = super(Event, self)._default_website_meta()
+        event_cover_properties = json.loads(self.cover_properties)
+        # background-image might contain single quotes eg `url('/my/url')`
+        res['default_opengraph']['og:image'] = res['default_twitter']['twitter:image'] = event_cover_properties.get('background-image', 'none')[4:-1].strip("'")
+        res['default_opengraph']['og:title'] = res['default_twitter']['twitter:title'] = self.name
+        res['default_opengraph']['og:description'] = res['default_twitter']['twitter:description'] = self.subtitle
+        res['default_twitter']['twitter:card'] = 'summary'
+        res['default_meta_description'] = self.subtitle
+        return res
+
+    def get_backend_menu_id(self):
+        return self.env.ref('event.event_main_menu').id