<?php

/**
 * @file
 * The main module file.
 *
 * The main module file contains hooks to create the permissions used by the
 * module, to log the login data, and to expose the module to views.
 */

/**
 * Implements hook_user_login().
 *
 * Stores the fact that the user has logged in. 3rd party modules may override
 * whether a particular login is tracked by using
 * hook_login_tracker_track_login_alter(). Modules may also provide additional
 * data to be logged by using
 * hook_login_tracker_login_data_alter().
 */
function login_tracker_user_login($account) {

  // Do not track the login by default if the user's role is excluded from
  // tracking.
  $track_login = !$account->hasPermission('excluded_from_login_tracking');

  // Allow other modules to override whether or not we're tracking this
  // login.
  \Drupal::moduleHandler()->alter('login_tracker_track_login', $track_login, $account);

  if (!$track_login) {
    return;
  }

  $data = [];
  \Drupal::moduleHandler()->alter('login_tracker_login_data', $data, $account);
  $data = serialize($data);

  $keys = [
    'record_id' => NULL,
  ];
  $fields = [
    'uid'             => $account->id(),
    'login_timestamp' => \Drupal::time()->getRequestTime(),
    'data'            => $data,
  ];

  \Drupal::database()->merge('login_tracker')
    ->key($keys)
    ->fields($fields)
    ->execute();
}

/**
 * Implements hook_cron().
 */
function login_tracker_cron() {
  $settings = \Drupal::state()->get('login_tracker_settings', []);
  if (!empty($settings['purge_interval'])) {
    $query = \Drupal::database()->delete('login_tracker');
    $query->condition('login_timestamp', time() - $settings['purge_interval'], '<=');
    $results = $query->execute();

    if ($results) {
      \Drupal::logger('login_tracker')->notice(
        t(
          '@logs records have been purged with success from table @table',
          ['@logs' => $results, '@table' => 'login_tracker']
        )
      );
    }
    else {
      \Drupal::logger('login_tracker')->notice(t('Nothing to purge from table @table', ['@table' => 'login_tracker']));
    }
  }
}