(function () {
    const registerLink = document.getElementById('kb-register-button');

    if (!registerLink) {
        return;
    }

    const params = new URLSearchParams(window.location.search);
    const redirectUri = params.get('redirect_uri');

    if (!redirectUri) {
        return;
    }

    try {
        const target = new URL(redirectUri);
        registerLink.href = target.origin + '/auth/register';
        registerLink.hidden = false;
    } catch (error) {
        console.warn('Registrierungslink konnte nicht vorbereitet werden.', error);
    }
}());