functions_be.lib.php

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<?php
/* Copyright (C) 2024   Alexandre Spangaro      <alexandre@inovea-conseil.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
function dolBECalculateStructuredCommunication($invoice_number, $invoice_type)
{
  $invoice_number = preg_replace('/[^0-9]/', '', $invoice_number); // Keep only numbers
 
  // We complete with 0 and take the last 8 digits of the number are used to generate the reference base.
  $invoice_number = substr('00000000'.$invoice_number, -8);
 
  // Prefix with invoice type
  switch ($invoice_type) {
    case '0':
      $invoice_type = '20'; // invoice type standard
      break;
    case '1':
      $invoice_type = '30'; // invoice type replacement
      break;
    case '2':
      $invoice_type = '40'; // invoice type credit note
      break;
    case '3':
      $invoice_type = '21'; // invoice type deposit
      break;
    case '5':
      $invoice_type = '20'; // invoice type situation, force to standard
      break;
    default:
      $invoice_type = '00';
  }
 
  // Calculate module97
  $invoice_number = $invoice_type.$invoice_number;
  $mod97 = intval($invoice_number) % 97;
  $controlKey = ($mod97 === 0) ? 97 : $mod97;
 
  // Add the check digit at the end of the reference
  $invoice_number .= $controlKey;
 
  // Format reference as XXX/XXXX/XXXXX
  $part1 = '+++'.substr($invoice_number, 0, 3);
  $part2 = substr($invoice_number, 3, 4);
  $part3 = substr($invoice_number, 7, 5).'+++'; // Includes last 3 digits + 2 check digits
 
  $invoice_number = $part1 . '/' . $part2 . '/' . $part3;
 
  return $invoice_number;
}