class.ilECSServerSettings.php

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<?php

declare(strict_types=1);

class ilECSServerSettings
{
    public const ALL_SERVER = 0;
    public const ACTIVE_SERVER = 1;
    public const INACTIVE_SERVER = 2;

    private static ilECSServerSettings $instance;

    // Injected
    private ilDBInterface $db;

    // Local
    private array $servers;


    protected function __construct()
    {
        global $DIC;

        $this->db = $DIC->database();

        $this->readServers();
    }

    public static function getInstance(): ilECSServerSettings
    {
        return self::$instance ?? (self::$instance = new ilECSServerSettings());
    }

    public function activeServerExists(): bool
    {
        return count($this->getServers(static::ACTIVE_SERVER)) ? true : false;
    }

    public function serverExists(): bool
    {
        return count($this->getServers(static::ALL_SERVER)) ? true : false;
    }

    public function getServers(int $server_type): array
    {
        switch ($server_type) {
            case static::ALL_SERVER:
                return $this->servers;
                break;
            case static::ACTIVE_SERVER:
                return array_filter($this->servers, static fn (ilECSSetting $server) => $server->isEnabled());
                break;
            case static::INACTIVE_SERVER:
                return array_filter($this->servers, static fn (ilECSSetting $server) => !$server->isEnabled());
                break;
            default:
                throw new InvalidArgumentException();
        }
    }

    private function readServers(): void
    {
        $query = 'SELECT server_id FROM ecs_server ' .
            'ORDER BY title ';
        $res = $this->db->query($query);

        $this->servers = array();
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            $server_id = (int) $row->server_id;
            $this->servers[$server_id] = ilECSSetting::getInstanceByServerId($server_id);
        }
    }
}