(function (ns) {
  'use strict';

  const DROPDOWN_ANIMATION_MS = 180;
  const dialog = document.getElementById('info-dialog');
  const title = document.getElementById('info-dialog-title');
  const dropdown = document.getElementById('info-dropdown');
  const closeButton = document.getElementById('info-close');
  const infoButton = document.getElementById('info-button');
  const pageTitles = Object.freeze({
    privacy: 'Datenschutzerklärung',
    imprint: 'Impressum',
    technology: 'Cookies und Technik'
  });
  let dropdownOpen = false;
  let dropdownCloseTimer = null;

  function isActivation(event) {
    if (event.type === 'keydown') return event.key === 'Enter' || event.key === ' ';
    if (event.type !== 'pointerup') return false;
    if (event.isPrimary === false) return false;
    return event.pointerType !== 'mouse' || event.button === 0;
  }

  function activate(element, handler) {
    if (!element) return;
    element.addEventListener('pointerup', event => {
      if (!isActivation(event)) return;
      event.preventDefault();
      event.stopPropagation();
      handler(event);
    });
    element.addEventListener('keydown', event => {
      if (!isActivation(event)) return;
      event.preventDefault();
      event.stopPropagation();
      handler(event);
    });
  }

  function setClass(element, className, enabled) {
    if (!element || !element.classList) return;
    element.classList.toggle(className, enabled);
  }

  function runNextFrame(callback) {
    if (typeof globalThis.requestAnimationFrame === 'function') {
      globalThis.requestAnimationFrame(callback);
      return;
    }
    callback();
  }

  function schedule(callback, timeout) {
    if (typeof globalThis.setTimeout === 'function') return globalThis.setTimeout(callback, timeout);
    callback();
    return null;
  }

  function cancelSchedule(timer) {
    if (timer === null || typeof globalThis.clearTimeout !== 'function') return;
    globalThis.clearTimeout(timer);
  }

  function setDropdownOpen(open) {
    if (!dropdown || !infoButton) return;
    dropdownOpen = open;
    infoButton.setAttribute('aria-expanded', open ? 'true' : 'false');
    cancelSchedule(dropdownCloseTimer);
    dropdownCloseTimer = null;

    if (open) {
      dropdown.hidden = false;
      runNextFrame(() => setClass(dropdown, 'is-open', true));
      return;
    }

    setClass(dropdown, 'is-open', false);
    dropdownCloseTimer = schedule(() => {
      if (dropdownOpen) return;
      dropdown.hidden = true;
    }, DROPDOWN_ANIMATION_MS);
  }

  function toggleDropdown() {
    setDropdownOpen(!dropdownOpen);
  }

  function elementContains(element, target) {
    if (!element || !target) return false;
    if (element === target) return true;
    return typeof element.contains === 'function' && element.contains(target);
  }

  function isInsideInfoControl(target) {
    return elementContains(infoButton, target) || elementContains(dropdown, target);
  }

  function syncStorageToggles() {
    const enabled = ns.PrivacyStorage.isProgressStorageEnabled();
    document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
      toggle.checked = enabled;
    });
    document.querySelectorAll('.cookie-toggle').forEach(toggle => {
      toggle.checked = false;
    });
  }

  function showPage(name) {
    const page = document.querySelector(`[data-info-page="${name}"]`);
    if (!page) return;

    title.textContent = pageTitles[name] ?? 'Informationen';
    document.querySelectorAll('[data-info-page]').forEach(item => {
      item.hidden = item !== page;
    });
    const content = document.querySelector('.info-dialog-content');
    if (content) content.scrollTop = 0;
  }

  function openDialog(name = 'privacy') {
    const pageName = Object.prototype.hasOwnProperty.call(pageTitles, name) ? name : 'privacy';
    setDropdownOpen(false);
    showPage(pageName);
    syncStorageToggles();
    if (!dialog.open) {
      if (typeof dialog.showModal === 'function') dialog.showModal();
      else dialog.setAttribute('open', '');
    }
    closeButton.focus();
  }

  function closeDialog() {
    if (typeof dialog.close === 'function') dialog.close();
    else dialog.removeAttribute('open');
    setDropdownOpen(false);
    infoButton.focus();
  }

  function bindStorageToggles() {
    document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
      toggle.addEventListener('change', event => {
        const enabled = ns.PrivacyStorage.setProgressStorageEnabled(event.currentTarget.checked);
        syncStorageToggles();
        document.dispatchEvent(new CustomEvent('wegwichtel:progress-storage-changed', {
          detail: { enabled }
        }));
      });
    });
  }

  activate(infoButton, toggleDropdown);
  activate(closeButton, closeDialog);
  document.querySelectorAll('[data-info-target]').forEach(button => {
    activate(button, () => openDialog(button.dataset.infoTarget));
  });

  document.addEventListener('pointerup', event => {
    if (!dropdownOpen || isInsideInfoControl(event.target)) return;
    setDropdownOpen(false);
  });
  document.addEventListener('keydown', event => {
    if (!dropdownOpen || event.key !== 'Escape' || dialog.open) return;
    event.preventDefault();
    setDropdownOpen(false);
    infoButton.focus();
  });

  dialog.addEventListener('pointerup', event => {
    if (event.target !== dialog || !isActivation(event)) return;
    event.preventDefault();
    event.stopPropagation();
    closeDialog();
  });
  dialog.addEventListener('cancel', event => {
    event.preventDefault();
    closeDialog();
  });

  bindStorageToggles();
  syncStorageToggles();

  ns.LegalUi = Object.freeze({
    open: openDialog,
    close: closeDialog,
    toggleMenu: toggleDropdown,
    closeMenu: () => setDropdownOpen(false),
    syncStorageToggles
  });
}(globalThis.Wegwichtel ??= {}));