<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.3                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2013                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM 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 Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */

/**
 * Generate ical invites for activities
 *
 */
class CRM_Activity_BAO_ICalendar {

  /**
   * @var object The activity for which we're generating ical.
   */
  protected $activity;

  /**
   * Constructor
   *
   * @param object $act Reference to an activity object
   *
   * @return void
   * @access public
   */
  function __construct( &$act ) {
    $this->activity = $act;
  }

  /**
   * Add an ics attachment to the input array
   *
   * @param array $attachments  Reference to array in same format returned from CRM_Core_BAO_File::getEntityFile()
   * @param array $contacts     Array of contacts (attendees)
   *
   * @return string   Array index of the added attachment in the $attachments array, or else null.
   * @access public
   */
  function addAttachment( &$attachments, $contacts ) {
    // Check preferences setting
    if ( CRM_Core_BAO_Setting::getItem( CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'activity_assignee_notification_ics' ) ) {
      $config = &CRM_Core_Config::singleton();
      $this->icsfile = tempnam( $config->customFileUploadDir, 'ics' );
      if ( $this->icsfile !== FALSE ) {
        rename( $this->icsfile, $this->icsfile . '.ics' );
        $this->icsfile .= '.ics';
        $icsFileName = basename( $this->icsfile );

        // get logged in user's primary email
        // TODO: Is there a better way to do this?
        $organizer = $this->getPrimaryEmail();

        $template = CRM_Core_Smarty::singleton();
        $template->assign('activity', $this->activity);
        $template->assign('organizer', $organizer);
        $template->assign('contacts', $contacts);
        $template->assign('timezone', date_default_timezone_get());
        $calendar = $template->fetch('CRM/Activity/Calendar/ICal.tpl');
        if ( file_put_contents( $this->icsfile, $calendar ) !== FALSE ) {
          if ( empty( $attachments ) ) {
            $attachments = array();
          }
          $attachments['activity_ics'] = array(
            'mime_type' => 'text/calendar',
            'fileName' => $icsFileName,
            'cleanName' => $icsFileName,
            'fullPath' => $this->icsfile,
           );
          return 'activity_ics';
        }
      }
    }
    return null;
  }

  function cleanup() {
    if ( !empty ( $this->icsfile ) ) {
      @unlink( $this->icsfile );
    }
  }

  // TODO: Is there a better way to do this?
  private function getPrimaryEmail() {
    $session = &CRM_Core_Session::singleton();
    $uid = $session->get('userID');
    $primary = '';
    $emails = CRM_Core_BAO_Email::allEmails( $uid );
    foreach ( $emails as $eid => $e ) {
      if ( $e['is_primary'] ) {
        if ( $e['email'] ) {
          $primary = $e['email'];
          break;
        }
      }

      if ( count($emails) == 1 ) {
        $primary = $e['email'];
        break;
      }
    }
    return $primary;
  }
}