text: # -*- coding: utf-8 -*-
  
  from odoo import api, fields, models, _
  
  
  class SaleOrder(models.Model):
      _inherit = "sale.order"
  
      attendee_count = fields.Integer('Attendee Count', compute='_compute_attendee_count')
  
      def write(self, vals):
          """ Synchronize partner from SO to registrations. This is done notably
          in website_sale controller shop/address that updates customer, but not
          only. """
          result = super(SaleOrder, self).write(vals)
          if vals.get('partner_id'):
              registrations_toupdate = self.env['event.registration'].search([('sale_order_id', 'in', self.ids)])
              registrations_toupdate.write({'partner_id': vals['partner_id']})
          return result
  
      def action_confirm(self):
          res = super(SaleOrder, self).action_confirm()
          for so in self:
              # confirm registration if it was free (otherwise it will be confirmed once invoice fully paid)
              so.order_line._update_registrations(confirm=so.amount_total == 0, cancel_to_draft=False)
              if any(line.event_id for line in so.order_line):
                  return self.env['ir.actions.act_window'] \
                      .with_context(default_sale_order_id=so.id) \
                      ._for_xml_id('event_sale.action_sale_order_event_registration')
          return res
  
      def action_view_attendee_list(self):
          action = self.env["ir.actions.actions"]._for_xml_id("event.event_registration_action_tree")
          action['domain'] = [('sale_order_id', 'in', self.ids)]
          return action
  
      def _compute_attendee_count(self):
          sale_orders_data = self.env['event.registration'].read_group(
              [('sale_order_id', 'in', self.ids)],
              ['sale_order_id'], ['sale_order_id']
          )
          attendee_count_data = {
              sale_order_data['sale_order_id'][0]:
              sale_order_data['sale_order_id_count']
              for sale_order_data in sale_orders_data
          }
          for sale_order in self:
              sale_order.attendee_count = attendee_count_data.get(sale_order.id, 0)
  
  
  class SaleOrderLine(models.Model):
  
      _inherit = 'sale.order.line'
  
      event_id = fields.Many2one(
          'event.event', string='Event',
          help="Choose an event and it will automatically create a registration for this event.")
      event_ticket_id = fields.Many2one(
          'event.event.ticket', string='Event Ticket',
          help="Choose an event ticket and it will automatically create a registration for this event ticket.")
      event_ok = fields.Boolean(related='product_id.event_ok', readonly=True)
  
      @api.depends('state', 'event_id')
      def _compute_product_uom_readonly(self):
          event_lines = self.filtered(lambda line: line.event_id)
          event_lines.update({'product_uom_readonly': True})
          super(SaleOrderLine, self - event_lines)._compute_product_uom_readonly()
  
      def _update_registrations(self, confirm=True, cancel_to_draft=False, registration_data=None, mark_as_paid=False):
          """ Create or update registrations linked to a sales order line. A sale
          order line has a product_uom_qty attribute that will be the number of
          registrations linked to this line. This method update existing registrations
          and create new one for missing one. """
          RegistrationSudo = self.env['event.registration'].sudo()
          registrations = RegistrationSudo.search([('sale_order_line_id', 'in', self.ids)])
          registrations_vals = []
          for so_line in self.filtered('event_id'):
              existing_registrations = registrations.filtered(lambda self: self.sale_order_line_id.id == so_line.id)
              if confirm:
                  existing_registrations.filtered(lambda self: self.state not in ['open', 'cancel']).action_confirm()
              if mark_as_paid:
                  existing_registrations.filtered(lambda self: not self.is_paid)._action_set_paid()
              if cancel_to_draft:
                  existing_registrations.filtered(lambda self: self.state == 'cancel').action_set_draft()
  
              for count in range(int(so_line.product_uom_qty) - len(existing_registrations)):
                  values = {
                      'sale_order_line_id': so_line.id,
                      'sale_order_id': so_line.order_id.id
                  }
                  # TDE CHECK: auto confirmation
                  if registration_data:
                      values.update(registration_data.pop())
                  registrations_vals.append(values)
  
          if registrations_vals:
              RegistrationSudo.create(registrations_vals)
          return True
  
      @api.onchange('product_id')
      def _onchange_product_id(self):
          # We reset the event when keeping it would lead to an inconstitent state.
          # We need to do it this way because the only relation between the product and the event is through the corresponding tickets.
          if self.event_id and (not self.product_id or self.product_id.id not in self.event_id.mapped('event_ticket_ids.product_id.id')):
              self.event_id = None
  
      @api.onchange('event_id')
      def _onchange_event_id(self):
          # We reset the ticket when keeping it would lead to an inconstitent state.
          if self.event_ticket_id and (not self.event_id or self.event_id != self.event_ticket_id.event_id):
              self.event_ticket_id = None
  
      @api.onchange('product_uom', 'product_uom_qty')
      def product_uom_change(self):
          if not self.event_ticket_id:
              super(SaleOrderLine, self).product_uom_change()
  
      @api.onchange('event_ticket_id')
      def _onchange_event_ticket_id(self):
          # we call this to force update the default name
          self.product_id_change()
  
      def get_sale_order_line_multiline_description_sale(self, product):
          """ We override this method because we decided that:
                  The default description of a sales order line containing a ticket must be different than the default description when no ticket is present.
                  So in that case we use the description computed from the ticket, instead of the description computed from the product.
                  We need this override to be defined here in sales order line (and not in product) because here is the only place where the event_ticket_id is referenced.
          """
          if self.event_ticket_id:
              ticket = self.event_ticket_id.with_context(
                  lang=self.order_id.partner_id.lang,
              )
  
              return ticket._get_ticket_multiline_description() + self._get_sale_order_line_multiline_description_variants()
          else:
              return super(SaleOrderLine, self).get_sale_order_line_multiline_description_sale(product)
  
      def _get_display_price(self, product):
          if self.event_ticket_id and self.event_id:
              return self.event_ticket_id.with_context(pricelist=self.order_id.pricelist_id.id, uom=self.product_uom.id).price_reduce
          else:
              return super()._get_display_price(product)
  