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diff --git a/addons/hr_attendance/models/hr_employee.py b/addons/hr_attendance/models/hr_employee.py
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+++ b/addons/hr_attendance/models/hr_employee.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import pytz
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
+
+from odoo import models, fields, api, exceptions, _, SUPERUSER_ID
+
+
+class HrEmployeeBase(models.AbstractModel):
+    _inherit = "hr.employee.base"
+
+    attendance_ids = fields.One2many('hr.attendance', 'employee_id', help='list of attendances for the employee')
+    last_attendance_id = fields.Many2one('hr.attendance', compute='_compute_last_attendance_id', store=True)
+    last_check_in = fields.Datetime(related='last_attendance_id.check_in', store=True)
+    last_check_out = fields.Datetime(related='last_attendance_id.check_out', store=True)
+    attendance_state = fields.Selection(string="Attendance Status", compute='_compute_attendance_state', selection=[('checked_out', "Checked out"), ('checked_in', "Checked in")])
+    hours_last_month = fields.Float(compute='_compute_hours_last_month')
+    hours_today = fields.Float(compute='_compute_hours_today')
+    hours_last_month_display = fields.Char(compute='_compute_hours_last_month')
+
+    @api.depends('user_id.im_status', 'attendance_state')
+    def _compute_presence_state(self):
+        """
+        Override to include checkin/checkout in the presence state
+        Attendance has the second highest priority after login
+        """
+        super()._compute_presence_state()
+        employees = self.filtered(lambda e: e.hr_presence_state != 'present')
+        employee_to_check_working = self.filtered(lambda e: e.attendance_state == 'checked_out'
+                                                            and e.hr_presence_state == 'to_define')
+        working_now_list = employee_to_check_working._get_employee_working_now()
+        for employee in employees:
+            if employee.attendance_state == 'checked_out' and employee.hr_presence_state == 'to_define' and \
+                    employee.id not in working_now_list:
+                employee.hr_presence_state = 'absent'
+            elif employee.attendance_state == 'checked_in':
+                employee.hr_presence_state = 'present'
+
+    def _compute_hours_last_month(self):
+        now = fields.Datetime.now()
+        now_utc = pytz.utc.localize(now)
+        for employee in self:
+            tz = pytz.timezone(employee.tz or 'UTC')
+            now_tz = now_utc.astimezone(tz)
+            start_tz = now_tz + relativedelta(months=-1, day=1, hour=0, minute=0, second=0, microsecond=0)
+            start_naive = start_tz.astimezone(pytz.utc).replace(tzinfo=None)
+            end_tz = now_tz + relativedelta(day=1, hour=0, minute=0, second=0, microsecond=0)
+            end_naive = end_tz.astimezone(pytz.utc).replace(tzinfo=None)
+
+            attendances = self.env['hr.attendance'].search([
+                ('employee_id', '=', employee.id),
+                '&',
+                ('check_in', '<=', end_naive),
+                ('check_out', '>=', start_naive),
+            ])
+
+            hours = 0
+            for attendance in attendances:
+                check_in = max(attendance.check_in, start_naive)
+                check_out = min(attendance.check_out, end_naive)
+                hours += (check_out - check_in).total_seconds() / 3600.0
+
+            employee.hours_last_month = round(hours, 2)
+            employee.hours_last_month_display = "%g" % employee.hours_last_month
+
+    def _compute_hours_today(self):
+        now = fields.Datetime.now()
+        now_utc = pytz.utc.localize(now)
+        for employee in self:
+            # start of day in the employee's timezone might be the previous day in utc
+            tz = pytz.timezone(employee.tz)
+            now_tz = now_utc.astimezone(tz)
+            start_tz = now_tz + relativedelta(hour=0, minute=0)  # day start in the employee's timezone
+            start_naive = start_tz.astimezone(pytz.utc).replace(tzinfo=None)
+
+            attendances = self.env['hr.attendance'].search([
+                ('employee_id', '=', employee.id),
+                ('check_in', '<=', now),
+                '|', ('check_out', '>=', start_naive), ('check_out', '=', False),
+            ])
+
+            worked_hours = 0
+            for attendance in attendances:
+                delta = (attendance.check_out or now) - max(attendance.check_in, start_naive)
+                worked_hours += delta.total_seconds() / 3600.0
+            employee.hours_today = worked_hours
+
+    @api.depends('attendance_ids')
+    def _compute_last_attendance_id(self):
+        for employee in self:
+            employee.last_attendance_id = self.env['hr.attendance'].search([
+                ('employee_id', '=', employee.id),
+            ], limit=1)
+
+    @api.depends('last_attendance_id.check_in', 'last_attendance_id.check_out', 'last_attendance_id')
+    def _compute_attendance_state(self):
+        for employee in self:
+            att = employee.last_attendance_id.sudo()
+            employee.attendance_state = att and not att.check_out and 'checked_in' or 'checked_out'
+
+    @api.model
+    def attendance_scan(self, barcode):
+        """ Receive a barcode scanned from the Kiosk Mode and change the attendances of corresponding employee.
+            Returns either an action or a warning.
+        """
+        employee = self.sudo().search([('barcode', '=', barcode)], limit=1)
+        if employee:
+            return employee._attendance_action('hr_attendance.hr_attendance_action_kiosk_mode')
+        return {'warning': _("No employee corresponding to Badge ID '%(barcode)s.'") % {'barcode': barcode}}
+
+    def attendance_manual(self, next_action, entered_pin=None):
+        self.ensure_one()
+        can_check_without_pin = not self.env.user.has_group('hr_attendance.group_hr_attendance_use_pin') or (self.user_id == self.env.user and entered_pin is None)
+        if can_check_without_pin or entered_pin is not None and entered_pin == self.sudo().pin:
+            return self._attendance_action(next_action)
+        return {'warning': _('Wrong PIN')}
+
+    def _attendance_action(self, next_action):
+        """ Changes the attendance of the employee.
+            Returns an action to the check in/out message,
+            next_action defines which menu the check in/out message should return to. ("My Attendances" or "Kiosk Mode")
+        """
+        self.ensure_one()
+        employee = self.sudo()
+        action_message = self.env["ir.actions.actions"]._for_xml_id("hr_attendance.hr_attendance_action_greeting_message")
+        action_message['previous_attendance_change_date'] = employee.last_attendance_id and (employee.last_attendance_id.check_out or employee.last_attendance_id.check_in) or False
+        action_message['employee_name'] = employee.name
+        action_message['barcode'] = employee.barcode
+        action_message['next_action'] = next_action
+        action_message['hours_today'] = employee.hours_today
+
+        if employee.user_id:
+            modified_attendance = employee.with_user(employee.user_id)._attendance_action_change()
+        else:
+            modified_attendance = employee._attendance_action_change()
+        action_message['attendance'] = modified_attendance.read()[0]
+        return {'action': action_message}
+
+    def _attendance_action_change(self):
+        """ Check In/Check Out action
+            Check In: create a new attendance record
+            Check Out: modify check_out field of appropriate attendance record
+        """
+        self.ensure_one()
+        action_date = fields.Datetime.now()
+
+        if self.attendance_state != 'checked_in':
+            vals = {
+                'employee_id': self.id,
+                'check_in': action_date,
+            }
+            return self.env['hr.attendance'].create(vals)
+        attendance = self.env['hr.attendance'].search([('employee_id', '=', self.id), ('check_out', '=', False)], limit=1)
+        if attendance:
+            attendance.check_out = action_date
+        else:
+            raise exceptions.UserError(_('Cannot perform check out on %(empl_name)s, could not find corresponding check in. '
+                'Your attendances have probably been modified manually by human resources.') % {'empl_name': self.sudo().name, })
+        return attendance
+
+    @api.model
+    def read_group(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):
+        if 'pin' in groupby or 'pin' in self.env.context.get('group_by', '') or self.env.context.get('no_group_by'):
+            raise exceptions.UserError(_('Such grouping is not allowed.'))
+        return super(HrEmployeeBase, self).read_group(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)
+
+    def _compute_presence_icon(self):
+        res = super()._compute_presence_icon()
+        # All employee must chek in or check out. Everybody must have an icon
+        employee_to_define = self.filtered(lambda e: e.hr_icon_display == 'presence_undetermined')
+        employee_to_define.hr_icon_display = 'presence_to_define'
+        return res