add "taken" page

buergeramt.user.js

// ==UserScript==
// @name           Bürgeramt Termin Hunting
// @description    Helfer fürs Bürgeramt
// @include        htt*://service.berlin.de/terminvereinbarung*
// @version        2.02
// ==/UserScript==
const MIN_RELOAD_DELAY = 60000;
const ADDITIONAL_RELOAD_DELAY = Math.round(Math.random() * 30000);
const HUNTING_CONFIG = {
  acceptableDayRange: 99,
  excludeSameDay: true,
  isTestMode: false,
  name:
    localStorage.getItem('buergeramt_name') ||
    localStorage.setItem('buergeramt_name', prompt('Vor- und Nachname eintragen') || ''),
  email:
    localStorage.getItem('buergeramt_email') ||
    localStorage.setItem('buergeramt_email', prompt('E-Mail-Adresse eintragen') || ''),
  phone:
    localStorage.getItem('buergeramt_phone') ||
    localStorage.setItem('buergeramt_phone', prompt('Telefonnummer eintragen') || ''),
};

class BuergeramtTerminHunting {
  constructor() {
    window.CheckInput = () => true; // bypass form check
    if (!this.areNotificationsAllowed && !this.areNotificationsRejected) {
      Notification.requestPermission();
    }

    document.readyState === 'complete' && this.start();
    document.onreadystatechange = () => document.readyState === 'complete' && this.start();
  }

  get currentPage() {
    const { href } = document.location;
    const pageMap = {
      taken: href.includes('terminvereinbarung/termin/taken'),
      calendar: href.includes('terminvereinbarung/termin/day'),
      captcha: href.includes('terminvereinbarung/termin/human'),
      appointment: href.includes('terminvereinbarung/termin/time'),
      book: href.includes('terminvereinbarung/termin/register'),
    };

    return Object.keys(pageMap).find((key) => pageMap[key]) ?? 'unknown';
  }

  get areNotificationsAllowed() {
    return Notification.permission === 'granted';
  }

  get areNotificationsRejected() {
    return Notification.permission === 'denied';
  }

  start() {
    const { currentPage } = this;

    currentPage === 'taken' && this.handleTakenPage();
    currentPage === 'calendar' && this.handleCalendarPage();
    currentPage === 'captcha' && this.handleCaptchaPage();
    currentPage === 'appointment' && this.handleAppointmentPage();
    currentPage === 'book' && this.handleBookPage();
    currentPage === 'unknown' && this.handleUnknownPage();
  }

  notify(text, halt = false) {
    this.areNotificationsAllowed && new Notification(text);
    halt && alert(text);
  }

  reloadPage() {
    setTimeout(() => document.location.reload(), MIN_RELOAD_DELAY + ADDITIONAL_RELOAD_DELAY);
  }

  handleTakenPage() {
    setInterval(() => document.querySelector('form[action*="termin/restart"] button:not([disabled])')?.click(), 1000);
  }

  handleCalendarPage() {
    const SELECTOR_NON_BOOKABLE = '.calendar-month-table td.nichtbuchbar';
    const SELECTOR_BOOKABLE = '.calendar-month-table td.buchbar';
    const CLASSNAME_TODAY = 'heutemarkierung';

    const allNodes = [...document.querySelectorAll(`${SELECTOR_BOOKABLE}, ${SELECTOR_NON_BOOKABLE}`)];
    const bookableNode = [...document.querySelectorAll(SELECTOR_BOOKABLE)].find((node) => {
      const index = allNodes.indexOf(node);
      const isToday = [...node.classList].includes(CLASSNAME_TODAY);
      return index + 1 < HUNTING_CONFIG.acceptableDayRange && (!HUNTING_CONFIG.excludeSameDay || !isToday);
    });

    if (bookableNode) {
      this.notify('[Bürgeramt] Termin gefunden!');
      bookableNode.querySelector('a').click();
    } else {
      this.reloadPage();
    }
  }

  handleCaptchaPage() {
    this.notify('[Bürgeramt] Captcha lösen!', true);
  }

  handleAppointmentPage() {
    const SELECTOR_BOOKABLE = '.calendar-table a[href^="/terminvereinbarung/termin/time/"]';
    const bookableNodeLink = document.querySelector(SELECTOR_BOOKABLE);
    if (!bookableNodeLink) {
      document.location.href = 'https://service.berlin.de/terminvereinbarung/termin/day/';
      return;
    }

    bookableNodeLink.click();
  }

  handleBookPage() {
    this.notify('[Bürgeramt] Terminbuchung wird abgeschlossen!');

    const formNameEl = document.querySelector('input[name=familyName]');
    const formEmailEl = document.querySelector('input[name=email]');
    const formPhoneEl = document.querySelector('input[name=telephone]');
    const formSurveyAcceptedEl = document.querySelector('select[name=surveyAccepted]');
    const formAcceptTermsEl = document.querySelector('input[name=agbgelesen]');
    const formSubmitEl = document.getElementById('register_submit');

    formNameEl && (formNameEl.value = HUNTING_CONFIG.name);
    formEmailEl && (formEmailEl.value = HUNTING_CONFIG.email);
    formPhoneEl && (formPhoneEl.value = HUNTING_CONFIG.phone);
    formSurveyAcceptedEl && (formSurveyAcceptedEl.value = '0');
    formAcceptTermsEl && (formAcceptTermsEl.checked = true);
    !HUNTING_CONFIG.isTestMode && formSubmitEl && formSubmitEl.click();
  }

  handleUnknownPage() {
    this.reloadPage();
  }
}

new BuergeramtTerminHunting();

Tested with Chrome + Tampermonkey (should work with FF + Greasemonkey, too)