MediaWiki:Common.js

/* Eigene Sprachleiste: manuelles Umschalten + persistente Speicherung via ULS-Cookie */
mw.loader.using(['mediawiki.util', 'mediawiki.api'], function () {

  // --- Nur im Lesemodus + Haupt-Namensraum (0) ---
  var action = mw.config.get('wgAction');
  var ns = mw.config.get('wgNamespaceNumber');
  if (action !== 'view' || ns !== 0) return;

  // --- Sprachen ---
  var LANGS = [
    { code: 'de', label: 'Deutsch' },
    { code: 'en', label: 'English' },
    { code: 'fr', label: 'Français' }
  ];
  var ALLOWED = ['de', 'en', 'fr'];
  var FALLBACK = 'en';

  function normalize(code) {
    if (!code) return FALLBACK;
    code = String(code).toLowerCase().split('-')[0];
    return ALLOWED.includes(code) ? code : FALLBACK;
  }

  // Basis-Titel ohne Sprach-Suffix
  var pageName = mw.config.get('wgPageName');
  var baseTitle = pageName.replace(/\/[a-z]{2}(?:-[a-z]{2})?$/i, '');

  // Ziel-URL mit Special:MyLanguage + uselang
  function targetUrl(code) {
    code = normalize(code);
    var title = 'Special:MyLanguage/' + baseTitle.replace(/_/g, ' ');
    var url = mw.util.getUrl(title);
    return url + (url.includes('?') ? '&' : '?') + 'uselang=' + code;
  }

  // ULS-Cookie setzen
  function setULSCookie(lang) {
    var days = 30;
    var expires = new Date(Date.now() + days * 864e5).toUTCString();
    document.cookie = "language=" + encodeURIComponent(lang) +
                      "; expires=" + expires +
                      "; path=/; samesite=lax";
  }

  // Sprachleiste einfügen
  if (!document.getElementById('custom-langbar')) {
    var bar = document.createElement('div');
    bar.id = 'custom-langbar';

    var currentLang = normalize(
      mw.config.get('wgUserLanguage') ||
      mw.config.get('wgContentLanguage') ||
      FALLBACK
    );

    LANGS.forEach(function (lang) {
      var a = document.createElement('a');
      a.href = '#';
      a.textContent = lang.label;
      if (currentLang === lang.code) a.className = 'active-lang';
      a.addEventListener('click', function (e) {
        e.preventDefault();
        switchLanguage(lang.code);
      });
      bar.appendChild(a);
    });

    var mount =
      document.querySelector('.minerva-header') ||
      document.querySelector('.vector-header') ||
      document.getElementById('content') ||
      document.body;

    if (mount && mount.parentNode) {
      mount.parentNode.insertBefore(bar, mount.nextSibling);
    } else {
      document.body.insertBefore(bar, document.body.firstChild);
    }
  }

  // Sprachwechsel durchführen
  function switchLanguage(code) {
    code = normalize(code);

    try {
      localStorage.setItem('preferredLang', code);
    } catch (e) {}

    setULSCookie(code); // Gäste: Cookie setzen, damit ULS Browser-Sprache ignoriert

    if (mw.config.get('wgUserName')) {
      // Eingeloggt: auch MW-Option setzen
      new mw.Api().postWithToken('csrf', {
        action: 'options',
        change: 'language=' + code
      }).always(function () {
        location.href = targetUrl(code);
      });
    } else {
      location.href = targetUrl(code);
    }
  }

  // Gäste markieren für CSS
  if (!mw.config.get('wgUserName')) {
    document.documentElement.classList.add('bv-anon');
  }

  // Gäste nicht auf Diskussionsseiten lassen
  if (!mw.config.get('wgUserName') && ns % 2 === 1) {
    var subject = mw.util.getUrl(mw.config.get('wgPageName').replace(/^Talk:/, ''));
    window.location.href = subject;
  }

  // --- Beim Laden prüfen: Cookie oder localStorage nutzen ---
  if (!mw.config.get('wgUserName')) {
    try {
      var prefLang = normalize(localStorage.getItem('preferredLang'));
      var cookieLang = (document.cookie.match(/(?:^|; )language=([^;]+)/) || [])[1];
      cookieLang = normalize(cookieLang);

      var chosenLang = prefLang || cookieLang;
      if (chosenLang && chosenLang !== normalize(mw.config.get('wgUserLanguage'))) {
        setULSCookie(chosenLang);
        var url = new URL(window.location.href);
        if (url.searchParams.get('uselang') !== chosenLang) {
          url.searchParams.set('uselang', chosenLang);
          location.replace(url.toString());
        }
      }
    } catch (e) {}
  }

});