class Tasks

class Tasks extends InstallTasks {
    
    /**
     * {@inheritdoc}
     */
    protected $pdoDriver = 'sqlite';
    
    /**
     * {@inheritdoc}
     */
    public function name() {
        return t('SQLite');
    }
    
    /**
     * {@inheritdoc}
     */
    public function minimumVersion() {
        return '3.7.11';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormOptions(array $database) {
        $form = parent::getFormOptions($database);
        // Remove the options that only apply to client/server style databases.
        unset($form['username'], $form['password'], $form['advanced_options']['host'], $form['advanced_options']['port']);
        // Make the text more accurate for SQLite.
        $form['database']['#title'] = t('Database file');
        $form['database']['#description'] = t('The absolute path to the file where @drupal data will be stored. This must be writable by the web server and should exist outside of the web root.', [
            '@drupal' => drupal_install_profile_distribution_name(),
        ]);
        $default_database = \Drupal::service('site.path') . '/files/.ht.sqlite';
        $form['database']['#default_value'] = empty($database['database']) ? $default_database : $database['database'];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function connect() {
        try {
            // This doesn't actually test the connection.
            Database::setActiveConnection();
            // Now actually do a check.
            Database::getConnection();
            $this->pass('Drupal can CONNECT to the database ok.');
        } catch (\Exception $e) {
            // Attempt to create the database if it is not found.
            if ($e->getCode() == Connection::DATABASE_NOT_FOUND) {
                // Remove the database string from connection info.
                $connection_info = Database::getConnectionInfo();
                $database = $connection_info['default']['database'];
                // We cannot use file_directory_temp() here because we haven't yet
                // successfully connected to the database.
                $connection_info['default']['database'] = \Drupal::service('file_system')->tempnam(sys_get_temp_dir(), 'sqlite');
                // In order to change the Database::$databaseInfo array, need to remove
                // the active connection, then re-add it with the new info.
                Database::removeConnection('default');
                Database::addConnectionInfo('default', 'default', $connection_info['default']);
                try {
                    Database::getConnection()->createDatabase($database);
                    Database::closeConnection();
                    // Now, restore the database config.
                    Database::removeConnection('default');
                    $connection_info['default']['database'] = $database;
                    Database::addConnectionInfo('default', 'default', $connection_info['default']);
                    // Check the database connection.
                    Database::getConnection();
                    $this->pass('Drupal can CONNECT to the database ok.');
                } catch (DatabaseNotFoundException $e) {
                    // Still no dice; probably a permission issue. Raise the error to the
                    // installer.
                    $this->fail(t('Failed to open or create database file %database. The database engine reports the following message when attempting to create the database: %error.', [
                        '%database' => $database,
                        '%error' => $e->getMessage(),
                    ]));
                }
            }
            else {
                // Database connection failed for some other reason than the database
                // not existing.
                $this->fail(t('Failed to connect to database. The database engine reports the following message: %error.<ul><li>Does the database file exist?</li><li>Does web server have permission to write to the database file?</li>Does the web server have permission to write to the directory the database file should be created in?</li></ul>', [
                    '%error' => $e->getMessage(),
                ]));
                return FALSE;
            }
        }
        return TRUE;
    }

}