// Login page: language, theme, local form and/or OIDC button (from /auth/config).
(function () {
  var I18N = {
    fr: { intro: 'Synchronisation de configuration Proxmox VE', user: 'Utilisateur', pass: 'Mot de passe',
          submit: 'Se connecter', sso: 'Se connecter avec le SSO', or: 'ou',
          error: 'Utilisateur ou mot de passe incorrect.', theme: 'Thème clair / sombre',
          demo: 'Mode démo : comptes {a}, {o} et {l}, mot de passe {p}.' },
    en: { intro: 'Proxmox VE configuration synchronization', user: 'User', pass: 'Password',
          submit: 'Sign in', sso: 'Sign in with SSO', or: 'or',
          error: 'Wrong user or password.', theme: 'Light / dark theme',
          demo: 'Demo mode: accounts {a}, {o} and {l}, password {p}.' },
  };
  function get(k) { try { return localStorage.getItem('confsync.' + k); } catch (e) { return null; } }
  function set(k, v) { try { localStorage.setItem('confsync.' + k, v); } catch (e) {} }
  var lang = get('lang');
  if (!I18N[lang]) lang = /^en\b/i.test(navigator.language || '') ? 'en' : 'fr';
  var cfg = { local: true, oidc: false, demo: false };

  function el(id) { return document.getElementById(id); }
  function code(s) { var c = document.createElement('code'); c.textContent = s; return c; }
  function applyLang() {
    var d = I18N[lang];
    document.documentElement.lang = lang;
    document.querySelectorAll('[data-i18n]').forEach(function (e) { e.textContent = d[e.dataset.i18n]; });
    document.querySelectorAll('[data-i18n-title]').forEach(function (e) { e.title = d[e.dataset.i18nTitle]; });
    document.querySelectorAll('[data-i18n-aria]').forEach(function (e) { e.setAttribute('aria-label', d[e.dataset.i18nAria]); });
    document.querySelectorAll('#langSwitch [data-lang]').forEach(function (b) { b.setAttribute('aria-checked', String(b.dataset.lang === lang)); });
    var h = el('demoHint');
    h.textContent = '';
    if (cfg.demo) {
      // "{a}" placeholders become <code> elements, never HTML from a string
      d.demo.split(/(\{[aolp]\})/).forEach(function (part) {
        var v = { '{a}': 'admin', '{o}': 'operateur', '{l}': 'lecteur', '{p}': 'confsync-demo' }[part];
        h.appendChild(v ? code(v) : document.createTextNode(part));
      });
    }
  }
  document.querySelectorAll('#langSwitch [data-lang]').forEach(function (b) {
    b.addEventListener('click', function () { lang = b.dataset.lang; set('lang', lang); applyLang(); });
  });
  el('themeBtn').addEventListener('click', function () {
    var root = document.documentElement;
    var dark = root.dataset.theme ? root.dataset.theme === 'dark' : matchMedia('(prefers-color-scheme: dark)').matches;
    root.dataset.theme = dark ? 'light' : 'dark';
    set('theme', root.dataset.theme);
  });

  var q = new URLSearchParams(location.search);
  var ret = q.get('r') || '/';
  el('ret').value = ret;
  el('err').hidden = q.get('e') !== '1';
  el('ssoBtn').href = 'auth/oidc?r=' + encodeURIComponent(ret);

  function show() {
    el('localForm').hidden = !cfg.local;
    el('ssoBtn').hidden = !cfg.oidc;
    el('sep').hidden = !(cfg.local && cfg.oidc);
    el('submitBtn').className = cfg.oidc ? 'btn' : 'btn primary';
    el('demoHint').hidden = !cfg.demo;
    applyLang();
  }
  show();
  fetch('auth/config', { headers: { Accept: 'application/json' } })
    .then(function (r) { return r.json(); })
    .then(function (c) { cfg = c; show(); })
    .catch(function () {});
})();