text: # -*- coding: utf-8 -*-
  # Part of Odoo. See LICENSE file for full copyright and licensing details.
  
  from odoo import api, fields, models, _
  from odoo.exceptions import UserError
  from stdnum import luhn
  
  
  class AccountMove(models.Model):
      _inherit = 'account.move'
  
      def _get_invoice_reference_se_ocr2(self, reference):
          self.ensure_one()
          return reference + luhn.calc_check_digit(reference)
  
      def _get_invoice_reference_se_ocr3(self, reference):
          self.ensure_one()
          reference = reference + str(len(reference) + 2)[:1]
          return reference + luhn.calc_check_digit(reference)
  
      def _get_invoice_reference_se_ocr4(self, reference):
          self.ensure_one()
  
          ocr_length = self.journal_id.l10n_se_invoice_ocr_length
  
          if len(reference) + 1 > ocr_length:
              raise UserError(_("OCR Reference Number length is greater than allowed. Allowed length in invoice journal setting is %s.") % str(ocr_length))
  
          reference = reference.rjust(ocr_length - 1, '0')
          return reference + luhn.calc_check_digit(reference)
  
  
      def _get_invoice_reference_se_ocr2_invoice(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr2(str(self.id))
  
      def _get_invoice_reference_se_ocr3_invoice(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr3(str(self.id))
  
      def _get_invoice_reference_se_ocr4_invoice(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr4(str(self.id))
  
      def _get_invoice_reference_se_ocr2_partner(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr2(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
  
      def _get_invoice_reference_se_ocr3_partner(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr3(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
  
      def _get_invoice_reference_se_ocr4_partner(self):
          self.ensure_one()
          return self._get_invoice_reference_se_ocr4(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
  
      @api.onchange('partner_id')
      def _onchange_partner_id(self):
          """ If Vendor Bill and Vendor OCR is set, add it. """
          if self.partner_id and self.move_type == 'in_invoice' and self.partner_id.l10n_se_default_vendor_payment_ref:
              self.payment_reference = self.partner_id.l10n_se_default_vendor_payment_ref
          return super(AccountMove, self)._onchange_partner_id()
  
      @api.onchange('payment_reference')
      def _onchange_payment_reference(self):
          """ If Vendor Bill and Payment Reference is changed check validation. """
          if self.partner_id and self.move_type == 'in_invoice' and self.partner_id.l10n_se_check_vendor_ocr:
              reference = self.payment_reference
              try:
                  luhn.validate(reference)
              except: 
                  return {'warning': {'title': _('Warning'), 'message': _('Vendor require OCR Number as payment reference. Payment reference isn\'t a valid OCR Number.')}}
          return super(AccountMove, self)._onchange_payment_reference()
  