(function () {
  var THEME_STORAGE_KEY = 'web-theme';
  var CKEDITOR_THEME_STYLE_ID = 'ckeditor-dark-theme-overrides';

  function getPreferredTheme() {
    if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
      return 'dark';
    }
    return 'light';
  }

  function getStoredTheme() {
    try {
      var storedTheme = window.localStorage.getItem(THEME_STORAGE_KEY);
      if (storedTheme === 'dark' || storedTheme === 'light') {
        return storedTheme;
      }
    } catch (error) {
      return null;
    }
    return null;
  }

  function setStoredTheme(theme) {
    try {
      window.localStorage.setItem(THEME_STORAGE_KEY, theme);
    } catch (error) {
      return;
    }
  }

  function getOrCreateCkeditorThemeStyleElement() {
    var styleElement = document.getElementById(CKEDITOR_THEME_STYLE_ID);

    if (styleElement) {
      return styleElement;
    }

    styleElement = document.createElement('style');
    styleElement.id = CKEDITOR_THEME_STYLE_ID;
    document.head.appendChild(styleElement);

    return styleElement;
  }

  function syncCkeditorTheme(theme) {
    var styleElement = getOrCreateCkeditorThemeStyleElement();

    if (theme !== 'dark') {
      styleElement.textContent = '';
      return;
    }

    styleElement.textContent = [
      '.ck-body-wrapper .ck.ck-dropdown__panel,',
      '.ck-body-wrapper .ck.ck-list__panel,',
      '.ck-body-wrapper .ck.ck-list,',
      '.ck-body-wrapper .ck.ck-balloon-panel {',
      '  background: var(--bs-body-bg) !important;',
      '  background-color: var(--bs-body-bg) !important;',
      '  border-color: var(--bs-border-color) !important;',
      '  color: var(--bs-body-color) !important;',
      '}',
      '.ck-body-wrapper .ck.ck-list .ck-list-item-button {',
      '  background: transparent !important;',
      '  background-color: transparent !important;',
      '  color: var(--bs-body-color) !important;',
      '}',
      '.ck-body-wrapper .ck.ck-list .ck-list-item-button:hover {',
      '  background: var(--bs-secondary-bg) !important;',
      '  background-color: var(--bs-secondary-bg) !important;',
      '}',
      '.ck-body-wrapper .ck.ck-color-grid,',
      '.ck-body-wrapper .ck.ck-color-grid__tile {',
      '  color: var(--bs-body-color) !important;',
      '}',
      '.ck-body-wrapper .ck.ck-color-grid__tile {',
      '  border-color: var(--bs-border-color) !important;',
      '}'
    ].join('\n');
  }

  function applyTheme(theme) {
    var normalizedTheme = theme === 'dark' ? 'dark' : 'light';
    var nextTheme = normalizedTheme === 'dark' ? 'light' : 'dark';
    var nextThemeLabel = nextTheme === 'dark' ? 'Dark mode' : 'Light mode';

    document.documentElement.dataset.bsTheme = normalizedTheme;
    document.documentElement.style.colorScheme = normalizedTheme;
    syncCkeditorTheme(normalizedTheme);

    Array.prototype.forEach.call(document.querySelectorAll('[data-theme-toggle]'), function (toggleButton) {
      var icon = toggleButton.querySelector('.theme-toggle__icon');
      toggleButton.setAttribute('aria-pressed', normalizedTheme === 'dark' ? 'true' : 'false');
      toggleButton.setAttribute('aria-label', 'Switch to ' + nextThemeLabel.toLowerCase());
      if (icon) {
        icon.classList.remove('theme-toggle__icon--moon', 'theme-toggle__icon--sun');
        icon.classList.add(normalizedTheme === 'dark' ? 'theme-toggle__icon--sun' : 'theme-toggle__icon--moon');
      }
    });

    return normalizedTheme;
  }

  function initThemeToggle() {
    var toggleButtons = Array.prototype.slice.call(document.querySelectorAll('[data-theme-toggle]'));
    var storedTheme = getStoredTheme();
    var theme = storedTheme || getPreferredTheme();

    applyTheme(theme);

    if (!toggleButtons.length) {
      return;
    }

    Array.prototype.forEach.call(toggleButtons, function (toggleButton) {
      toggleButton.addEventListener('click', function () {
        var nextTheme = document.documentElement.dataset.bsTheme === 'dark' ? 'light' : 'dark';
        setStoredTheme(nextTheme);
        applyTheme(nextTheme);
      });
    });
  }

  function initSidebarToggle() {
    var body = document.body;
    var toggleButtons = Array.prototype.slice.call(document.querySelectorAll('[data-sidebar-toggle]'));
    var backdrop = document.querySelector('[data-sidebar-backdrop]');

    if (!toggleButtons.length || !backdrop) {
      return;
    }

    function setSidebarOpen(isOpen) {
      body.classList.toggle('is-sidebar-open', isOpen);
      Array.prototype.forEach.call(toggleButtons, function (toggleButton) {
        toggleButton.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
      });
    }

    function toggleSidebar() {
      setSidebarOpen(!body.classList.contains('is-sidebar-open'));
    }

    Array.prototype.forEach.call(toggleButtons, function (toggleButton) {
      toggleButton.addEventListener('click', function () {
        toggleSidebar();
      });
    });

    backdrop.addEventListener('click', function () {
      setSidebarOpen(false);
    });

    document.addEventListener('keydown', function (event) {
      if (event.key === 'Escape') {
        setSidebarOpen(false);
      }
    });
  }

  window.getPreferredTheme = getPreferredTheme;
  window.getStoredTheme = getStoredTheme;
  window.setStoredTheme = setStoredTheme;
  window.applyTheme = applyTheme;
  window.initThemeToggle = initThemeToggle;
  window.initSidebarToggle = initSidebarToggle;

  initThemeToggle();
  initSidebarToggle();
}());