<?php

/**
 * @file
 * The inactive user module controls inactive users.
 *
 * The inactive user module sends mails to inactive users.
 * The user can configure the time after Drupal sends mails.
 */


/**
 * Implements hook_permission().
 */
function inactive_user_permission() {
  return array(
    'change inactive user settings' => array(
      'title' => t('Change inactive user settings'),
    ),
  );
}

/**
 * Implements hook_menu().
 */
function inactive_user_menu() {
  $items['admin/people/inactive-user'] = array(
    'title' => 'Inactive users',
    'description' => 'Set rules and contact templates for inactive users.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('inactive_user_custom_settings'),
    'access arguments' => array('change inactive user settings'),
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}

/**
 * Implements hook_user_cancel().
 */
function inactive_user_user_cancel($edit, $account, $method) {
  db_delete('inactive_users')
  ->condition('uid', $account->uid)
  ->execute();
}

/**
 * Custom settings page: menu callback
 *
 * (we're using a custom callback to enable a nicer menu title,
 * without underscore)
 */
function inactive_user_custom_settings() {
  $period = array(0 => 'disabled') + drupal_map_assoc(array(604800, 1209600, 1814400, 2419200, 2592000, 7776000, 15552000, 23328000, 31536000, 47088000, 63072000), '_format_interval');
  $warn_period = array(0 => 'disabled') + drupal_map_assoc(array(86400, 172800, 259200, 604800, 1209600, 1814400, 2592000), '_format_interval');
  $mail_variables = ' %username, %useremail, %lastaccess, %period, %sitename, %siteurl';
  $groups = array(0 => 'disabled') + drupal_map_assoc(get_group_list(8)); //8 ist die Parent Id von CUR

  
  // set administrator e-mail
  $form['inactive_user_admin_email_fieldset'] = array(
    '#type' => 'fieldset',
    '#title' => t('Administrator e-mail'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['inactive_user_admin_email_fieldset']['inactive_user_admin_email'] = array(
    '#type' => 'textfield',
    '#title' => t('E-mail addresses'),
    '#default_value' => _inactive_user_admin_mail(),
    '#description' => t('Supply a comma-separated list of e-mail addresses that will receive administrator alerts. Spaces between addresses are allowed.'),
    '#maxlength' => 256,
    '#required' => TRUE,
  );

  //Selct group
  $form['inactive_user_group_fieldset'] = array(
    '#type' => 'fieldset',
    '#title' => t('User groups'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['inactive_user_group_fieldset']['inactive_user_groups'] = array(
    '#type' => 'select',
    '#title' => t('user groups'),
	'#multiple' => TRUE,
    '#default_value' => variable_get('inactive_user_notify_admin', 0),
    '#options' => $groups,
    '#description' => t('The other functions are applied only to users from the suitable groups. WARNING: Parent Groups don\'t select childs. If you select groups, please unselect disable'),
  );
  
  // inactive user notification
  $form['inactive_user_notification'] = array(
    '#type' => 'fieldset',
    '#title' => t('Inactive user notification'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['inactive_user_notification']['inactive_user_notify_admin'] = array(
    '#type' => 'select',
    '#title' => t('Notify administrator when a user hasn\'t logged in for more than'),
    '#default_value' => variable_get('inactive_user_notify_admin', 0),
    '#options' => $period,
    '#description' => t('Generate an email to notify the site administrator that a user account hasn\'t been used for longer than the specified amount of time.  Requires crontab.'),
  );
  $form['inactive_user_notification']['inactive_user_notify'] = array(
    '#type' => 'select',
    '#title' => t('Notify users when they haven\'t logged in for more than'),
    '#default_value' => variable_get('inactive_user_notify', 0),
    '#options' => $period,
    '#description' => t('Generate an email to notify users when they haven\'t used their account for longer than the specified amount of time.  Requires crontab.'),
  );
  $form['inactive_user_notification']['inactive_user_notify_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Body of user notification e-mail'),
    '#default_value' => variable_get('inactive_user_notify_text', _inactive_user_mail_text('notify_text')),
    '#cols' => 70,
    '#rows' => 10,
    '#description' => t('Customize the body of the notification e-mail sent to the user.') . ' ' . t('Available variables are:') . $mail_variables,
    '#required' => TRUE,
  );

  // automatically block inactive users
  /*$form['block_inactive_user'] = array(
    '#type' => 'fieldset',
    '#title' => t('Automatically block inactive users'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['block_inactive_user']['inactive_user_auto_block'] = array(
    '#type' => 'select',
    '#title' => t('Block users that haven\'t logged in for more than'),
    '#default_value' => variable_get('inactive_user_auto_block', 0),
    '#options' => $period,
    '#description' => t('Automatically block user accounts that haven\'t been used in the specified amount of time.  Requires crontab.'),
  );
  $form['block_inactive_user']['inactive_user_notify_block'] = array(
    '#type' => 'checkbox',
    '#title' => t('Notify user'),
    '#default_value' => variable_get('inactive_user_notify_block', 0),
    '#description' => t('Generate an email to notify a user that his/her account has been automatically blocked.'),
  );
  $form['block_inactive_user']['inactive_user_block_notify_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Body of blocked user acount e-mail'),
    '#default_value' => variable_get('inactive_user_block_notify_text', _inactive_user_mail_text('block_notify_text')),
    '#cols' => 70,
    '#rows' => 10,
    '#description' => t('Customize the body of the notification e-mail sent to the user when their account has been blocked.') . ' ' . t('Available variables are:') . $mail_variables,
    '#required' => TRUE,
  );
  $form['block_inactive_user']['inactive_user_notify_block_admin'] = array(
    '#type' => 'checkbox',
    '#title' => t('Notify administrator'),
    '#default_value' => variable_get('inactive_user_notify_block_admin', 0),
    '#description' => t('Generate an email to notify the site administrator when a user is automatically blocked.'),
  );
  $form['block_inactive_user']['inactive_user_auto_block_warn'] = array(
    '#type' => 'select',
    '#title' => t('Warn users before they are blocked'),
    '#default_value' => variable_get('inactive_user_auto_block_warn', 0),
    '#options' => $warn_period,
    '#description' => t('Generate an email to notify a user that his/her account is about to be blocked.'),
  );
  $form['block_inactive_user']['inactive_user_block_warn_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Body of user warning e-mail'),
    '#default_value' => variable_get('inactive_user_block_warn_text', _inactive_user_mail_text('block_warn_text')),
    '#cols' => 70,
    '#rows' => 10,
    '#description' => t('Customize the body of the notification e-mail sent to the user when their account is about to be blocked.') . ' ' . t('Available variables are:') . $mail_variables,
    '#required' => TRUE,
  );
	*/
  
  // automatically delete inactive users
  /*
  $form['delete_inactive_user'] = array(
    '#type' => 'fieldset',
    '#title' => t('Automatically delete inactive users'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['delete_inactive_user']['inactive_user_auto_delete'] = array(
    '#type' => 'select',
    '#title' => t('Delete users that haven\'t logged in for more than'),
    '#default_value' => variable_get('inactive_user_auto_delete', 0),
    '#options' => $period,
    '#description' => t('Automatically delete user accounts that haven\'t been used in the specified amount of time.  Warning, user accounts are permanently deleted, with no ability to undo the action!  Requires crontab.'),
  );
  $form['delete_inactive_user']['inactive_user_preserve_content'] = array(
    '#type' => 'checkbox',
    '#title' => t('Preserve users that own site content'),
    '#default_value' => variable_get('inactive_user_preserve_content', 1),
    '#description' => t('Select this option to never delete users that own site content.  If you delete a user that owns content on the site, such as a user that created a node or left a comment, the content will no longer be available via the normal Drupal user interface.  That is, if a user creates a node or leaves a comment, then the user is deleted, the node and/or comment will no longer be accesible even though it will still be in the database.'),
  );
  $form['delete_inactive_user']['inactive_user_notify_delete'] = array(
    '#type' => 'checkbox',
    '#title' => t('Notify user'),
    '#default_value' => variable_get('inactive_user_notify_delete', 0),
    '#description' => t('Generate an email to notify a user that his/her account has been automatically deleted.'),
  );
  $form['delete_inactive_user']['inactive_user_delete_notify_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Body of deleted user account e-mail'),
    '#default_value' => variable_get('inactive_user_delete_notify_text', _inactive_user_mail_text('delete_notify_text')),
    '#cols' => 70,
    '#rows' => 10,
    '#description' => t('Customize the body of the notification e-mail sent to the user when their account has been deleted.') . ' ' . t('Available variables are:') . $mail_variables,
    '#required' => TRUE,
  );
  $form['delete_inactive_user']['inactive_user_notify_delete_admin'] = array(
    '#type' => 'checkbox',
    '#title' => t('Notify administrator'),
    '#default_value' => variable_get('inactive_user_notify_delete_admin', 0),
    '#description' => t('Generate an email to notify the site administrator when a user is automatically deleted.'),
  );
  $form['delete_inactive_user']['inactive_user_auto_delete_warn'] = array(
    '#type' => 'select',
    '#title' => t('Warn users before they are deleted'),
    '#default_value' => variable_get('inactive_user_auto_delete_warn', 0),
    '#options' => $warn_period,
    '#description' => t('Generate an email to notify a user that his/her account is about to be deleted.'),
  );
  $form['delete_inactive_user']['inactive_user_delete_warn_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Body of user warning e-mail'),
    '#default_value' => variable_get('inactive_user_delete_warn_text', _inactive_user_mail_text('delete_warn_text')),
    '#cols' => 70,
    '#rows' => 10,
    '#description' => t('Customize the body of the notification e-mail sent to the user when their account is about to be deleted.') . ' ' . t('Available variables are:') . $mail_variables,
    '#required' => TRUE,
  );
  */
  return system_settings_form($form);
}

function get_group_list($vid){
	$grouplist = array();
	//var_dump(taxonomy_get_tree($vid));
	foreach (taxonomy_get_tree($vid) as $group) {	
		$grouplist[$group->tid] = $group->name;
	}
	return $grouplist;
}

function inactive_user_custom_settings_validate($form, &$form_state) {
  $valid_email = $form_state['values']['inactive_user_admin_email'];
  $mails = explode(',', $valid_email);
  $count = 0;
  foreach ($mails as $mail) {
    if ($mail && !valid_email_address(trim($mail))) {
      $invalid[] = $mail;
      $count++;
    }
  }
  if ($count ==  1) {
    form_set_error('inactive_user_admin_email', t('%mail is not a valid e-mail address', array('%mail' => $invalid[0])));
  }
  elseif ($count > 1) {
    form_set_error('inactive_user_admin_email', t('The following e-mail addresses are invalid: %mail', array('%mail' => implode(', ', $invalid))));
  }
}

/**
 * Implements hook_cron().
 */
function inactive_user_cron() {
  if ((REQUEST_TIME - variable_get('inactive_user_timestamp', '0')) >= 86100) { // Only check once every almost-day, so we slide around the clock and don't overload the server.
    variable_set('inactive_user_timestamp', REQUEST_TIME);
    $user_list = '';

    // reset notifications if recent user activity
    $users = db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid <> :uid', array(':uid' => 1)));
    if ($users) {
      foreach ($users as $uid) {
        $u = db_fetch_object(db_query('SELECT access, name FROM {users} WHERE uid = :uid', array(':uid' => $uid)));
        if ($u->access > REQUEST_TIME - 604800) {
          // user activity in last week, remove from inactivity table
          db_query('DELETE FROM {inactive_users} WHERE uid = %d', $uid);
          db_delete('inactive_users')
            ->condition('uid', $uid)
            ->execute();
          watchdog('user', 'recent user activity: %user removed from inactivity list', array('%user' => $u->name), WATCHDOG_NOTICE, l(t('edit user'), "user/$uid/edit", array('query' => array('destination' => 'admin/user/user'))));
        }
      }
    }

    // notify administrator of inactive user accounts
    if ($notify_time = variable_get('inactive_user_notify_admin', 0)) {
      $result = db_query('SELECT uid, name, mail, access, created FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND uid <> 1', REQUEST_TIME, $notify_time, REQUEST_TIME, $notify_time);
      while ($user = db_fetch_object($result)) {
        if ($user->uid && !db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND notified_admin = 1', $user->uid)) && ($user->created < (REQUEST_TIME - $notify_time))) {
          db_query('UPDATE {inactive_users} SET notified_admin = 1 WHERE uid = %d', $user->uid);
          if (!db_affected_rows()) {
            // must create a new row
            @db_query('INSERT INTO {inactive_users} (uid, notified_admin) VALUES (%d, 1)', $user->uid);
          }
          $user_list .= "$user->name ($user->mail) last active on " . format_date($user->access, 'large') . ".\n";
        }
      }
      if (isset($user_list)) {
        _inactive_user_mail(t('[@sitename] Inactive users', array('@sitename' => variable_get('site_name', 'drupal'))), _inactive_user_mail_text('notify_admin_text'), $notify_time, NULL, $user_list);
        unset($user_list);
      }
    }

    // notify users that their account has been inactive
    if ($notify_time = variable_get('inactive_user_notify', 0)) {
      $result = db_query('SELECT * FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND status <> 0 AND uid <> 1', REQUEST_TIME, $notify_time, REQUEST_TIME, $notify_time);
      while ($user = db_fetch_object($result)) {
        if ($user->uid && !db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE notified_user = 1 AND uid = %d', $user->uid)) && ($user->created < (REQUEST_TIME - $notify_time))) {
          db_query('UPDATE {inactive_users} SET notified_user = 1 WHERE uid = %d', $user->uid);
          if (!db_affected_rows()) {
            @db_query('INSERT INTO {inactive_users} (uid, notified_user) VALUES (%d, 1)', $user->uid);
          }
          _inactive_user_mail(t('[@sitename] Account inactivity', array('@sitename' => variable_get('site_name', 'drupal'))), variable_get('inactive_user_notify_text', _inactive_user_mail_text('notify_text')), $notify_time, $user, NULL);
          watchdog('user', 'user %user notified of inactivity', array('%user' => $user->name), WATCHDOG_INFO, l(t('edit user'), "user/$user->uid/edit", array('query' => array('destination' => 'admin/user/user'))));
        }
      }
    }

    // warn users when they are about to be blocked
    if (($warn_time = variable_get('inactive_user_auto_block_warn', 0)) &&
        ($block_time = variable_get('inactive_user_auto_block', 0))) {
      $result = db_query('SELECT * FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND status <> 0 AND uid <> 1', REQUEST_TIME, $warn_time, REQUEST_TIME, $warn_time);
      while ($user = db_fetch_object($result)) {
        if ($user->uid && !db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND warned_user_block_timestamp > 0', $user->uid)) && ($user->created < (REQUEST_TIME - $warn_time))) {
          db_query('UPDATE {inactive_users} SET warned_user_block_timestamp = %d WHERE uid = %d', REQUEST_TIME + $warn_time, $user->uid);
          if (!db_affected_rows()) {
            @db_query('INSERT INTO {inactive_users} (uid, warned_user_block_timestamp) VALUES (%d, %d)', $user->uid, REQUEST_TIME + $warn_time);
          }
          _inactive_user_mail(t('[@sitename] Account inactivity', array('@sitename' => variable_get('site_name', 'drupal'))), variable_get('inactive_user_block_warn_text', _inactive_user_mail_text('block_warn_text')), $warn_time, $user, NULL);
          watchdog('user', 'user %user warned will be blocked due to inactivity', array('%user' => $user->name), WATCHDOG_NOTICE, l(t('edit user'), "user/$user->uid/edit", array('query' => array('destination' => 'admin/user/user'))));
        }
      }
    }

    // automatically block users
    if ($block_time = variable_get('inactive_user_auto_block', 0)) {
      $result = db_query('SELECT * FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND status <> 0 AND uid <> 1', REQUEST_TIME, $block_time, REQUEST_TIME, $block_time);
      while ($user = db_fetch_object($result)) {
        // don't block user yet if we sent a warning and it hasn't expired
        if ($user->uid && db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND warned_user_block_timestamp < %d', $user->uid, REQUEST_TIME)) && ($user->created < (REQUEST_TIME - $block_time))) {
          db_query('UPDATE {users} SET status = 0 WHERE uid = %d', $user->uid);

          // notify user
          if (variable_get('inactive_user_notify_block', 0)) {
            if (!db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND notified_user_block = 1', $user->uid))) {
              db_query('UPDATE {inactive_users} SET notified_user_block = 1 WHERE uid = %d', $user->uid);
              if (!db_affected_rows()) {
                @db_query('INSERT INTO {inactive_users} (uid, notified_user_block) VALUES (%d, 1)', $user->uid);
              }
              _inactive_user_mail(t('[@sitename] Account blocked due to inactivity', array('@sitename' => variable_get('site_name', 'drupal'))), variable_get('inactive_user_block_notify_text', _inactive_user_mail_text('block_notify_text')), $block_time, $user, NULL);
              watchdog('user', 'user %user blocked due to inactivity', array('%user' => $user->name), WATCHDOG_NOTICE, l(t('edit user'), "user/$user->uid/edit", array('query' => array('destination' => 'admin/user/user'))));
            }
          }

          // notify admin
          if (variable_get('inactive_user_notify_block_admin', 0)) {
            if (!db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d and notified_admin_block = 1', $user->uid))) {
              db_query('UPDATE {inactive_users} SET notified_admin_block = 1 WHERE uid = %d', $user->uid);
              if (!db_affected_rows()) {
                @db_query('INSERT INTO {inactive_users} (uid, notified_admin_block) VALUES(%d, 1)', $user->uid);
              }
              $user_list .= "$user->name ($user->mail) last active on " . format_date($user->access, 'large') . ".\n";
            }
          }
        }
        if ($user_list) {
          _inactive_user_mail(t('[@sitename] Blocked users', array('@sitename' => variable_get('site_name', 'drupal'))), _inactive_user_mail_text('block_notify_admin_text'), $block_time, NULL, $user_list);
          unset($user_list);
        }
      }
    }

    // warn users when they are about to be deleted
    if (($warn_time = variable_get('inactive_user_auto_delete_warn', 0)) &&
        ($delete_time = variable_get('inactive_user_auto_delete', 0))) {
      $result = db_query('SELECT * FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND uid <> 1', REQUEST_TIME, $warn_time, REQUEST_TIME, $warn_time);
      while ($user = db_fetch_object($result)) {
        if ($user->uid && !db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND warned_user_delete_timestamp > 0', $user->uid)) && ($user->created < (REQUEST_TIME - $warn_time))) {
          if (variable_get('inactive_user_preserve_content', 1) && _inactive_user_with_content($user->uid)) {
            $protected = 1;
          }
          else {
            $protected = 0;
          }
          db_query('UPDATE {inactive_users} SET warned_user_delete_timestamp = %d AND protected = %d WHERE uid = %d', REQUEST_TIME + $warn_time, $protected, $user->uid);
          if (!db_affected_rows()) {
            @db_query('INSERT INTO {inactive_users} (uid, warned_user_delete_timestamp, protected) VALUES (%d, %d, %d)', $user->uid, REQUEST_TIME + $warn_time, $protected);
          }
          if (!$protected) {
            _inactive_user_mail(t('[@sitename] Account inactivity', array('@sitename' => variable_get('site_name', 'drupal'))), variable_get('inactive_user_delete_warn_text', _inactive_user_mail_text('delete_warn_text')), $warn_time, $user, NULL);
            watchdog('user', 'user %user warned will be deleted due to inactivity', array('%user' => $user->mail), WATCHDOG_NOTICE, l(t('edit user'), "user/$user->uid/edit", array('query' => array('destination' => 'admin/user/user'))));
          }
        }
      }
    }

    // automatically delete users
    if ($delete_time = variable_get('inactive_user_auto_delete', 0)) {
      $result = db_query('SELECT * FROM {users} WHERE ((access <> 0 AND login <> 0 AND access < (%d - %d)) OR (login = 0 AND created < (%d - %d))) AND uid <> 1', REQUEST_TIME, $delete_time, REQUEST_TIME, $delete_time);
      while ($user = db_fetch_object($result)) {
        if ($user->uid && ((variable_get('inactive_user_auto_delete_warn', 0) && db_fetch_object(db_query('SELECT uid FROM {inactive_users} WHERE uid = %d AND warned_user_delete_timestamp < %d AND protected <> 1', $user->uid, REQUEST_TIME))) || (!variable_get('inactive_user_auto_delete_warn', 0))) && ($user->created < (REQUEST_TIME - $delete_time))) {
          if (variable_get('inactive_user_preserve_content', 1) && _inactive_user_with_content($user->uid)) {
            // this is a protected user, mark as such
            db_query('UPDATE {inactive_users} SET protected = 1 WHERE uid = %d', $user->uid);
            if (!db_affected_rows()) {
              @db_query('INSERT INTO {inactive_users} (uid, protected) VALUES (%d, 1)', $user->uid, $protected);
            }
          }
          else {
            // delete the user
            // not using user_delete() so we can send custom emails and watchdog
            $array = (array) $user;
            sess_destroy_uid($user->uid);
            db_delete('users')
              ->condition('uid', $user->uid)
              ->execute();
            db_delete('users_roles')
              ->condition('uid', $user->uid)
              ->execute();
            db_delete('authmap')
              ->condition('uid', $user->uid)
              ->execute();
            module_invoke_all('user', 'delete', $array, $user);
            if (variable_get('inactive_user_notify_delete', 0)) {
              _inactive_user_mail(t('[@sitename] Account removed', array('@sitename' => variable_get('site_name', 'drupal'))), variable_get('inactive_user_delete_notify_text', _inactive_user_mail_text('delete_notify_text')), $delete_time, $user, NULL);
            }
            if (variable_get('inactive_user_notify_delete_admin', 0)) {
              $user_list .= "$user->name ($user->mail) last active on " . format_date($user->access, 'large') . ".\n";
            }
            watchdog('user', 'user %user deleted due to inactivity', array('%user' => $user->name));
          }
        }
      }
      if ($user_list) {
        _inactive_user_mail(t('[@sitename] Deleted accounts', array('@sitename' => variable_get('site_name', 'drupal'))), _inactive_user_mail_text('delete_notify_admin_text'), $delete_time, NULL, $user_list);
        unset($user_list);
      }
    }
  }
}

/**
 * Slighty modified from format_interval() in common.inc to include months.
 */
function _format_interval($timestamp, $granularity = 2) {
  $units = array(
    '1 year|@count years' => 31536000,
    '1 month|@count months' => 2592000,
    '1 week|@count weeks' => 604800,
    '1 day|@count days' => 86400,
    '1 hour|@count hours' => 3600,
    '1 min|@count min' => 60,
    '1 sec|@count sec' => 1,
  );
  $output = '';
  foreach ($units as $key => $value) {
    $key = explode('|', $key);
    if ($timestamp >= $value) {
      $output .= ($output ? ' ' : '') . format_plural(floor($timestamp / $value), $key[0], $key[1]);
      $timestamp %= $value;
      $granularity--;
    }

    if ($granularity == 0) {
      break;
    }
  }
  return ($output) ? $output : t('0 sec');
}

/**
 * Get administrator e-mail address(es)
 */
function _inactive_user_admin_mail() {
  $uid = 1;
  $admin_mail = db_query('SELECT mail FROM {users} WHERE uid = :uid', array(':uid' => $uid));
  return variable_get('inactive_user_admin_email', variable_get('site_mail', $admin_mail));
}

/**
 * Implements hook_mail().
 */
function inactive_user_mail($key, &$message, $params) {
  $message['subject'] = $params['subject'];
  $message['body'][] = $params['message'];
}

/**
 * Wrapper for user_mail.
 */
function _inactive_user_mail($subject, $message, $period, $user = NULL, $user_list = NULL) {
  global $base_url;
  if ($user_list) {
    $to = _inactive_user_admin_mail();
    $variables = array(
      '%period' => _format_interval($period),
      '%sitename' => variable_get('site_name', 'drupal'),
      '%siteurl' => $base_url,
      "%userlist" => $user_list,
    );
  }
  elseif (isset($user->uid)) {
    $to = $user->mail;
    $variables = array(
      '%username' => $user->name,
      '%useremail' => $user->mail,
      '%lastaccess' => empty($user->access) ? t('never') : format_date($user->access, 'custom', 'M d, Y'),
      '%period' => _format_interval($period),
      '%sitename' => variable_get('site_name', 'drupal'),
      '%siteurl' => $base_url,
    );
  }
  if (isset($to)) {
    $from = variable_get('site_mail', ini_get('sendmail_from'));
    $headers = array(
      'Reply-to' => $from,
      'Return-path' => "<$from>",
      'Errors-to' => $from,
    );
    $recipients = explode(',', $to);
    foreach ($recipients as $recipient) {
      $recipient = trim($recipient);
      $params = array(
        'subject' => $subject,
        'message' => strtr($message, $variables),
        'headers' => $headers,
      );
      $user = array_shift(user_load_multiple(array(), array('mail' => $recipient)));
      $language = isset($user->uid) ? user_preferred_language($user) :  language_default();
      drupal_mail('inactive_user', 'inactive_user_notice', $recipient, $language, $params, $from, TRUE);
    }
  }
}

/**
 * Some default e-mail notification strings.
 */
function _inactive_user_mail_text($message) {
  switch ($message) {
    case 'notify_text':
      return t("Hello %username,\n\n  We haven't seen you at %sitename since %lastaccess, and we miss you!  Please come back and visit us soon at %siteurl.\n\nSincerely,\n  %sitename team");
      break;
    case 'notify_admin_text':
      return t("Hello,\n\n  This automatic notification is to inform you that the following users haven't been seen on %sitename for more than %period:\n\n%userlist");
      break;
    case 'block_warn_text':
      return t("Hello %username,\n\n  We haven't seen you at %sitename since %lastaccess, and we miss you!  This automatic message is to warn you that your account will be disabled in %period unless you come back and visit us before that time.\n\n  Please visit us at %siteurl.\n\nSincerely,\n  %sitename team");
      break;
    case 'block_notify_text':
      return t("Hello %username,\n\n  This automatic message is to notify you that your account on %sitename has been automatically disabled due to no activity for more than %period.\n\n  Please visit us at %siteurl to have your account re-enabled.\n\nSincerely,\n  %sitename team");
      break;
    case 'block_notify_admin_text':
      return t("Hello,\n\n  This automatic notification is to inform you that the following users have been automatically blocked due to inactivity on %sitename for more than %period:\n\n%userlist");
      break;
    case 'delete_warn_text':
      return t("Hello %username,\n\n  We haven't seen you at %sitename since %lastaccess, and we miss you!  This automatic message is to warn you that your account will be completely removed in %period unless you come back and visit us before that time.\n\n  Please visit us at %siteurl.\n\nSincerely,\n  %sitename team");
      break;
    case 'delete_notify_text':
      return t("Hello %username,\n\n  This automatic message is to notify you that your account on %sitename has been automatically removed due to no activity for more than %period.\n\n  Please visit us at %siteurl if you would like to create a new account.\n\nSincerely,\n  %sitename team");
      break;
    case 'delete_notify_admin_text':
      return t("Hello,\n\n  This automatic notification is to inform you that the following users have been automatically deleted due to inactivity on %sitename for more than %period:\n\n%userlist");
      break;
  }
}

/**
 * Returns 1 if the user has ever created a node or a comment.
 *
 * The settings of inactive_user.module allow to protect such
 * users from deletion.
 */
function _inactive_user_with_content($uid) {
  return (db_fetch_object(db_query('SELECT uid FROM {node} WHERE uid = :uid', array(':uid' => $uid))) || db_fetch_object(db_query('SELECT uid FROM {comments} WHERE uid = :uid', array(':uid' => $uid))));
}