/* HPS Vorlagen & Signaturen — Web-Editor Frontend
 * Vanilla JS, keine Abhängigkeiten. Spricht ausschließlich mit dem
 * gleichnamigen Express-Backend (same origin) über die /api-Endpunkte.
 */
(function () {
  'use strict';

  // ── Konstanten (müssen mit dem Backend übereinstimmen) ──
  const SHARED_FOLDER = '_gemeinsam';
  const USER_FOLDER   = '_benutzer';
  const SIG_FOOTERS   = 'signatures/footers';
  const SIG_HEADERS   = 'signatures/headers';

  // ── Globaler Zustand ──
  const state = {
    config: null,        // /api/config
    tree: null,          // /api/tree
    current: null,       // { path, friendly, sha, exists, isNew, category }
    dirty: false,
    view: 'visual',      // 'visual' | 'html'
    collapsed: { templates: false, footers: false, headers: false },
    groupsCollapsed: {}, // key -> bool (Vorlagen-Untergruppen)
    pendingNetwork: 0,
  };

  // ── DOM-Referenzen ──
  const $ = (id) => document.getElementById(id);
  const el = {
    statusPill:   $('status-pill'),
    statusText:   $('status-text'),
    configBanner: $('config-banner'),
    treeTemplates:$('tree-templates'),
    treeFooters:  $('tree-footers'),
    treeHeaders:  $('tree-headers'),
    emptyState:   $('empty-state'),
    editorPanel:  $('editor-panel'),
    fileFriendly: $('file-friendly'),
    filePath:     $('file-path'),
    dirtyBadge:   $('dirty-badge'),
    btnSave:      $('btn-save'),
    btnReload:    $('btn-reload'),
    btnDelete:    $('btn-delete'),
    btnRefresh:   $('btn-refresh-tree'),
    treeSearch:   $('tree-search'),
    btnNewDept:   $('btn-new-department'),
    btnNewFooter: $('btn-new-footer'),
    btnNewHeader: $('btn-new-header'),
    tabVisual:    $('tab-visual'),
    tabHtml:      $('tab-html'),
    formatToolbar:$('format-toolbar'),
    visualEditor: $('visual-editor'),
    htmlEditor:   $('html-editor'),
    visualWrap:   $('visual-wrap'),
    htmlWrap:     $('html-wrap'),
    previewFrame: $('preview-frame'),
    toastStack:   $('toast-stack'),
    loading:      $('loading-overlay'),
    fmtColor:     $('fmt-color'),
    fmtColorSwatch: $('fmt-color-swatch'),
    fmtFontSize:  $('fmt-fontsize'),
    fmtLink:      $('fmt-link'),
    fmtImage:     $('fmt-image'),
    // Modals
    confirmBackdrop: $('confirm-backdrop'),
    confirmTitle: $('confirm-title'),
    confirmMessage: $('confirm-message'),
    confirmOk:    $('confirm-ok'),
    confirmCancel:$('confirm-cancel'),
    promptBackdrop: $('prompt-backdrop'),
    promptForm:   $('prompt-form'),
    promptTitle:  $('prompt-title'),
    promptFields: $('prompt-fields'),
    promptOk:     $('prompt-ok'),
    promptCancel: $('prompt-cancel'),
  };

  // ────────────────────────────────────────────────────────────
  //  Hilfsfunktionen
  // ────────────────────────────────────────────────────────────

  // HTML-escapen für sichere Anzeige in Attributen/Text.
  function esc(s) {
    return String(s)
      .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;').replace(/'/g, '&#39;');
  }

  // Dateiname aus Vorlagennamen ableiten (exakt laut Vorgabe), .html ergänzt der Aufrufer.
  function slugifyName(name) {
    return name
      .replace(/[äÄ]/g, 'ae').replace(/[öÖ]/g, 'oe').replace(/[üÜ]/g, 'ue').replace(/ß/g, 'ss')
      .replace(/[/\\:*?"<>|]/g, '-')
      .replace(/^[\s.-]+|[\s.-]+$/g, '')
      .trim();
  }

  // Für Signatur-Köpfe: zusätzlich klein + Leerzeichen → '-'.
  function slugifyHeaderName(name) {
    return slugifyName(name).toLowerCase().replace(/\s+/g, '-');
  }

  // Debounce-Helfer.
  function debounce(fn, ms) {
    let t;
    return function (...args) { clearTimeout(t); t = setTimeout(() => fn.apply(this, args), ms); };
  }

  // ── Toasts ──
  function toast(message, type) {
    const t = document.createElement('div');
    t.className = 'toast' + (type ? ' toast-' + type : '');
    const icon = type === 'success' ? '✓' : type === 'error' ? '⚠' : 'ℹ';
    t.innerHTML = '<span class="toast-icon">' + icon + '</span><span class="toast-msg"></span>';
    t.querySelector('.toast-msg').textContent = message;
    el.toastStack.appendChild(t);
    setTimeout(() => {
      t.classList.add('fade-out');
      t.addEventListener('animationend', () => t.remove(), { once: true });
    }, 4000);
  }

  // ── Lade-Overlay (zählt verschachtelte Netzwerkaufrufe) ──
  function startLoading() { state.pendingNetwork++; el.loading.hidden = false; }
  function stopLoading()  { state.pendingNetwork = Math.max(0, state.pendingNetwork - 1); if (state.pendingNetwork === 0) el.loading.hidden = true; }

  // ── Zentraler fetch-Wrapper: JSON, Fehler→toast, Overlay ──
  async function api(path, options) {
    startLoading();
    try {
      const res = await fetch(path, options);
      let data = null;
      const text = await res.text();
      if (text) { try { data = JSON.parse(text); } catch (_) { data = { error: text }; } }
      if (!res.ok) {
        const msg = (data && data.error) ? data.error : ('HTTP ' + res.status + ' ' + res.statusText);
        throw new Error(msg);
      }
      return data || {};
    } finally {
      stopLoading();
    }
  }

  // ── Custom confirm-Modal → Promise<boolean> ──
  function confirmModal(message, opts) {
    opts = opts || {};
    el.confirmTitle.textContent = opts.title || 'Bestätigen';
    el.confirmMessage.textContent = message;
    el.confirmOk.textContent = opts.okLabel || 'Bestätigen';
    el.confirmOk.className = 'btn ' + (opts.danger ? 'btn-danger' : 'btn-primary');
    el.confirmBackdrop.hidden = false;
    return new Promise((resolve) => {
      function cleanup(result) {
        el.confirmBackdrop.hidden = true;
        el.confirmOk.removeEventListener('click', onOk);
        el.confirmCancel.removeEventListener('click', onCancel);
        el.confirmBackdrop.removeEventListener('click', onBackdrop);
        resolve(result);
      }
      const onOk = () => cleanup(true);
      const onCancel = () => cleanup(false);
      const onBackdrop = (e) => { if (e.target === el.confirmBackdrop) cleanup(false); };
      el.confirmOk.addEventListener('click', onOk);
      el.confirmCancel.addEventListener('click', onCancel);
      el.confirmBackdrop.addEventListener('click', onBackdrop);
    });
  }

  // ── Custom prompt-Modal mit beliebigen Feldern → Promise<{}|null> ──
  // fields: [{ key, label, type='text', placeholder, value, options:[{value,label}], required, hint }]
  // onChange(values, fieldEls) optional für Live-Vorschau.
  function promptModal(title, fields, onChange) {
    el.promptTitle.textContent = title;
    el.promptFields.innerHTML = '';
    const inputs = {};

    fields.forEach((f) => {
      const wrap = document.createElement('div');
      wrap.className = 'field';
      const label = document.createElement('label');
      label.textContent = f.label;
      wrap.appendChild(label);

      let input;
      if (f.type === 'select') {
        input = document.createElement('select');
        (f.options || []).forEach((o) => {
          const opt = document.createElement('option');
          opt.value = o.value;
          opt.textContent = o.label;
          input.appendChild(opt);
        });
        if (f.value != null) input.value = f.value;
      } else {
        input = document.createElement('input');
        input.type = f.type || 'text';
        if (f.placeholder) input.placeholder = f.placeholder;
        if (f.value != null) input.value = f.value;
      }
      input.dataset.key = f.key;
      wrap.appendChild(input);

      if (f.hint || f.live) {
        const hint = document.createElement('div');
        hint.className = 'hint';
        if (f.live) hint.dataset.live = f.key;
        if (f.hint) hint.textContent = f.hint;
        wrap.appendChild(hint);
      }
      el.promptFields.appendChild(wrap);
      inputs[f.key] = input;
    });

    const readValues = () => {
      const v = {};
      Object.keys(inputs).forEach((k) => { v[k] = inputs[k].value; });
      return v;
    };

    el.promptBackdrop.hidden = false;
    const first = el.promptFields.querySelector('input, select');
    if (first) setTimeout(() => first.focus(), 30);

    return new Promise((resolve) => {
      function cleanup(result) {
        el.promptBackdrop.hidden = true;
        el.promptForm.removeEventListener('submit', onSubmit);
        el.promptCancel.removeEventListener('click', onCancel);
        el.promptBackdrop.removeEventListener('click', onBackdrop);
        el.promptForm.removeEventListener('input', onInput);
        resolve(result);
      }
      function onSubmit(e) {
        e.preventDefault();
        const values = readValues();
        // Pflichtfelder prüfen.
        for (const f of fields) {
          if (f.required && !String(values[f.key] || '').trim()) {
            toast('Bitte „' + f.label + '“ ausfüllen.', 'error');
            inputs[f.key].focus();
            return;
          }
        }
        cleanup(values);
      }
      const onCancel = () => cleanup(null);
      const onBackdrop = (e) => { if (e.target === el.promptBackdrop) cleanup(null); };
      const onInput = () => { if (onChange) onChange(readValues(), inputs, el.promptFields); };
      el.promptForm.addEventListener('submit', onSubmit);
      el.promptCancel.addEventListener('click', onCancel);
      el.promptBackdrop.addEventListener('click', onBackdrop);
      el.promptForm.addEventListener('input', onInput);
      if (onChange) onChange(readValues(), inputs, el.promptFields); // initial
    });
  }

  // ────────────────────────────────────────────────────────────
  //  Anzeige-Namen (friendly labels)
  // ────────────────────────────────────────────────────────────

  function footerLabel(name) {
    if (name === '_default.html') return 'Gemeinsam (alle Abteilungen)';
    return name.replace(/\.html$/i, '');
  }

  function headerLabel(name) {
    if (name === '_vorlage.html') return 'Vorlage (Standard-Kopf)';
    // <email>.<slug>.html  →  "email — slug"
    // E-Mail enthält genau ein '@'; alles bis zum ersten '.' NACH dem '@' ist die E-Mail.
    const base = name.replace(/\.html$/i, '');
    const at = base.indexOf('@');
    if (at >= 0) {
      const firstDotAfterAt = base.indexOf('.', at);
      if (firstDotAfterAt > -1 && firstDotAfterAt < base.length - 1) {
        const email = base.slice(0, firstDotAfterAt);
        const slug = base.slice(firstDotAfterAt + 1);
        return email + ' — ' + slug;
      }
    }
    return base; // Fallback
  }

  function templateLabel(name) {
    return name.replace(/\.html$/i, '');
  }

  // Liefert eine friendly-Bezeichnung anhand Kategorie + Dateiname.
  function friendlyFor(category, name) {
    if (category === 'footer') return 'Fußzeile: ' + footerLabel(name);
    if (category === 'header') return 'Signatur: ' + headerLabel(name);
    return templateLabel(name);
  }

  // ────────────────────────────────────────────────────────────
  //  Verbindungsstatus
  // ────────────────────────────────────────────────────────────

  async function loadConfigAndHealth() {
    // Config (best effort, ohne Overlay-Spam → eigener leichter Aufruf)
    try {
      const cfg = await api('/api/config');
      state.config = cfg;
      if (!cfg.configured) {
        el.configBanner.hidden = false;
        setStatus('error', 'Nicht konfiguriert');
        return false;
      }
      el.configBanner.hidden = true;
    } catch (e) {
      setStatus('error', 'Nicht verbunden');
      toast('Konfiguration konnte nicht geladen werden: ' + e.message, 'error');
      return false;
    }
    // Health
    try {
      const health = await api('/api/health');
      if (health.ok) {
        const c = state.config;
        setStatus('ok', 'Verbunden: ' + c.owner + '/' + c.repo + '@' + c.branch);
      } else {
        setStatus('error', 'Nicht verbunden: ' + (health.error || 'unbekannt'));
      }
    } catch (e) {
      setStatus('error', 'Nicht verbunden: ' + e.message);
      toast('Verbindung zum Repository fehlgeschlagen: ' + e.message, 'error');
      return false;
    }
    return true;
  }

  function setStatus(kind, text) {
    el.statusPill.className = 'status-pill status-' + (kind === 'ok' ? 'ok' : kind === 'error' ? 'error' : 'unknown');
    el.statusText.textContent = text;
    el.statusPill.title = text;
  }

  // ────────────────────────────────────────────────────────────
  //  Baum (Sidebar) laden & rendern
  // ────────────────────────────────────────────────────────────

  async function loadTree() {
    try {
      state.tree = await api('/api/tree');
      renderTree();
    } catch (e) {
      toast('Liste konnte nicht geladen werden: ' + e.message, 'error');
    }
  }

  function renderTree() {
    renderTemplates();
    renderFooters();
    renderHeaders();
    applySectionCollapse();
    highlightActive();
    // Aktiven Filter nach Neuaufbau erneut anwenden.
    if (el.treeSearch && el.treeSearch.value.trim()) applyTreeFilter();
  }

  // Live-Filter über alle Dateien (Label + Pfad). Leere Suche = voller Baum.
  function applyTreeFilter() {
    const q = (el.treeSearch.value || '').trim().toLowerCase();
    if (!q) { renderTree(); return; } // pristinen Baum (inkl. Klappzustand) wiederherstellen

    document.querySelectorAll('.tree-section').forEach((s) => s.classList.remove('collapsed'));
    document.querySelectorAll('.sidebar .group-files').forEach((b) => b.classList.remove('collapsed'));
    document.querySelectorAll('.sidebar .group-title').forEach((t) => t.classList.remove('collapsed'));
    document.querySelectorAll('.sidebar .add-item, .sidebar .tree-empty').forEach((n) => { n.style.display = 'none'; });

    document.querySelectorAll('.sidebar .tree-item').forEach((it) => {
      const label = (it.querySelector('.ti-label')?.textContent || '').toLowerCase();
      const path = (it.dataset.path || '').toLowerCase();
      it.style.display = (label.includes(q) || path.includes(q)) ? '' : 'none';
    });

    // Gruppen ohne sichtbaren Treffer ausblenden.
    document.querySelectorAll('.sidebar .tree-group').forEach((g) => {
      const items = g.querySelectorAll('.tree-item');
      const anyVisible = Array.from(items).some((i) => i.style.display !== 'none');
      g.style.display = (items.length && !anyVisible) ? 'none' : '';
    });
  }

  // Datei-Item-Element bauen.
  function fileItem(file, category) {
    const div = document.createElement('div');
    div.className = 'tree-item';
    div.dataset.path = file.path;
    div.dataset.sha = file.sha || '';
    div.dataset.category = category;
    div.dataset.name = file.name;
    const label = category === 'footer' ? footerLabel(file.name)
                : category === 'header' ? headerLabel(file.name)
                : templateLabel(file.name);
    const icon = category === 'footer' ? '📜' : category === 'header' ? '✍️' : '📄';
    div.innerHTML = '<span class="ti-icon">' + icon + '</span><span class="ti-label"></span>';
    div.querySelector('.ti-label').textContent = label;
    div.title = file.path;
    div.addEventListener('click', () => openFile(file.path, { friendly: friendlyFor(category, file.name), sha: file.sha, category, exists: true }));
    return div;
  }

  // „+ Neue …“-Button.
  function addButton(text, onClick) {
    const b = document.createElement('button');
    b.className = 'add-item';
    b.textContent = text;
    b.addEventListener('click', (e) => { e.stopPropagation(); onClick(); });
    return b;
  }

  // Eine ein-/ausklappbare Gruppe (für Vorlagen).
  function makeGroup(key, title, icon, files, category, onAdd, isSub) {
    const group = document.createElement('div');
    group.className = 'tree-group' + (isSub ? ' subgroup' : '');

    const head = document.createElement('div');
    head.className = 'group-head';

    const collapsed = !!state.groupsCollapsed[key];
    const toggle = document.createElement('button');
    toggle.className = 'group-title' + (collapsed ? ' collapsed' : '');
    toggle.innerHTML = '<span class="g-caret">▾</span><span class="group-icon">' + icon + '</span><span class="g-label"></span>';
    toggle.querySelector('.g-label').textContent = title;
    head.appendChild(toggle);
    group.appendChild(head);

    const body = document.createElement('div');
    body.className = 'group-files' + (collapsed ? ' collapsed' : '');
    if (files.length === 0) {
      const empty = document.createElement('div');
      empty.className = 'tree-empty';
      empty.textContent = 'Keine Dateien';
      body.appendChild(empty);
    } else {
      files.forEach((f) => body.appendChild(fileItem(f, category)));
    }
    if (onAdd) body.appendChild(addButton('+ Neue Vorlage', onAdd));
    group.appendChild(body);

    toggle.addEventListener('click', () => {
      state.groupsCollapsed[key] = !state.groupsCollapsed[key];
      toggle.classList.toggle('collapsed');
      body.classList.toggle('collapsed');
    });
    return group;
  }

  function renderTemplates() {
    const c = el.treeTemplates;
    c.innerHTML = '';
    const t = state.tree;
    if (!t) return;

    // _gemeinsam
    c.appendChild(makeGroup(
      'tmpl:' + SHARED_FOLDER, 'Alle Abteilungen (_gemeinsam)', '🌐',
      t.templates[SHARED_FOLDER] || [], 'template',
      () => newTemplate(SHARED_FOLDER)
    ));

    // Abteilungen
    (t.departments || []).forEach((dept) => {
      c.appendChild(makeGroup(
        'tmpl:' + dept, dept, '🏢',
        t.templates[dept] || [], 'template',
        () => newTemplate(dept)
      ));
    });

    // Persönlich → übergeordnete Gruppe mit Untergruppen je Benutzer
    const users = t.users || {};
    const userKeys = Object.keys(users).sort((a, b) => a.localeCompare(b, 'de'));
    const persGroup = document.createElement('div');
    persGroup.className = 'tree-group';
    const persKey = 'tmpl:__pers';
    const persCollapsed = !!state.groupsCollapsed[persKey];
    const persToggle = document.createElement('button');
    persToggle.className = 'group-title' + (persCollapsed ? ' collapsed' : '');
    persToggle.innerHTML = '<span class="g-caret">▾</span><span class="group-icon">👤</span><span class="g-label">Persönlich</span>';
    const persHead = document.createElement('div');
    persHead.className = 'group-head';
    persHead.appendChild(persToggle);
    persGroup.appendChild(persHead);
    const persBody = document.createElement('div');
    persBody.className = 'group-files' + (persCollapsed ? ' collapsed' : '');
    if (userKeys.length === 0) {
      const empty = document.createElement('div');
      empty.className = 'tree-empty';
      empty.textContent = 'Keine persönlichen Ordner';
      persBody.appendChild(empty);
    } else {
      userKeys.forEach((email) => {
        // Persönlicher Ordnerpfad: _benutzer/<email>
        persBody.appendChild(makeGroup(
          'tmpl:user:' + email, email, '✉️',
          users[email] || [], 'template',
          () => newTemplate(USER_FOLDER + '/' + email),
          true
        ));
      });
    }
    persGroup.appendChild(persBody);
    persToggle.addEventListener('click', () => {
      state.groupsCollapsed[persKey] = !state.groupsCollapsed[persKey];
      persToggle.classList.toggle('collapsed');
      persBody.classList.toggle('collapsed');
    });
    c.appendChild(persGroup);
  }

  function renderFooters() {
    const c = el.treeFooters;
    c.innerHTML = '';
    const footers = (state.tree && state.tree.footers) || [];
    if (footers.length === 0) {
      const empty = document.createElement('div');
      empty.className = 'tree-empty';
      empty.textContent = 'Keine Fußzeilen';
      c.appendChild(empty);
    } else {
      footers.forEach((f) => c.appendChild(fileItem(f, 'footer')));
    }
    c.appendChild(addButton('+ Neue Fußzeile', newFooter));
  }

  function renderHeaders() {
    const c = el.treeHeaders;
    c.innerHTML = '';
    const headers = (state.tree && state.tree.headers) || [];
    if (headers.length === 0) {
      const empty = document.createElement('div');
      empty.className = 'tree-empty';
      empty.textContent = 'Keine Signatur-Köpfe';
      c.appendChild(empty);
    } else {
      headers.forEach((f) => c.appendChild(fileItem(f, 'header')));
    }
    c.appendChild(addButton('+ Neue Signatur', newHeader));
  }

  function applySectionCollapse() {
    document.querySelectorAll('.tree-section').forEach((sec) => {
      const key = sec.dataset.section;
      const toggle = sec.querySelector('.section-toggle');
      const collapsed = !!state.collapsed[key];
      sec.classList.toggle('collapsed', collapsed);
      toggle.setAttribute('aria-expanded', String(!collapsed));
    });
  }

  function highlightActive() {
    document.querySelectorAll('.tree-item').forEach((item) => {
      item.classList.toggle('is-active', state.current && item.dataset.path === state.current.path);
    });
  }

  // ────────────────────────────────────────────────────────────
  //  Datei öffnen / laden
  // ────────────────────────────────────────────────────────────

  async function openFile(path, meta) {
    // Ungespeicherte Änderungen?
    if (state.dirty) {
      const ok = await confirmModal('Es gibt ungespeicherte Änderungen. Trotzdem eine andere Datei öffnen? Die Änderungen gehen verloren.', { title: 'Ungespeicherte Änderungen', okLabel: 'Verwerfen', danger: true });
      if (!ok) return;
    }
    try {
      const data = await api('/api/file?path=' + encodeURIComponent(path));
      state.current = {
        path: data.path,
        friendly: meta.friendly,
        sha: data.sha,
        exists: data.exists,
        isNew: false,
        category: meta.category,
      };
      setEditorContent(data.content || '');
      setDirty(false);
      showEditor();
      highlightActive();
    } catch (e) {
      toast('Datei konnte nicht geladen werden: ' + e.message, 'error');
    }
  }

  // Neue (noch nicht gespeicherte) Datei direkt im Editor öffnen.
  function openNewFile(path, friendly, category) {
    state.current = { path, friendly, sha: null, exists: false, isNew: true, category };
    setEditorContent('');
    setDirty(true);          // neu = ungespeichert
    showEditor();
    highlightActive();
    el.visualEditor.focus();
    toast('Neue Datei „' + friendly + '“ – jetzt bearbeiten und speichern.', 'success');
  }

  function showEditor() {
    el.emptyState.hidden = true;
    el.editorPanel.hidden = false;
    el.fileFriendly.textContent = state.current.friendly;
    el.filePath.textContent = state.current.path;
    setView('visual');
  }

  function hideEditor() {
    state.current = null;
    el.editorPanel.hidden = true;
    el.emptyState.hidden = false;
    highlightActive();
  }

  // Inhalt in beide Editoren + Vorschau setzen.
  function setEditorContent(html) {
    el.visualEditor.innerHTML = html;
    el.htmlEditor.value = html;
    updatePreview();
  }

  // Aktuellen HTML-Inhalt aus dem gerade aktiven View lesen.
  function currentHtml() {
    return state.view === 'html' ? el.htmlEditor.value : el.visualEditor.innerHTML;
  }

  // ────────────────────────────────────────────────────────────
  //  Dirty-State
  // ────────────────────────────────────────────────────────────

  function setDirty(d) {
    state.dirty = d;
    el.dirtyBadge.hidden = !d;
    // Speichern aktiv, wenn: keine Datei → aus; neue (ungespeicherte) Datei → immer an;
    // bestehende Datei → nur bei ungespeicherten Änderungen.
    if (!state.current) el.btnSave.disabled = true;
    else if (!state.current.exists) el.btnSave.disabled = false;
    else el.btnSave.disabled = !d;
  }

  function markDirty() {
    if (!state.dirty) setDirty(true);
  }

  // ────────────────────────────────────────────────────────────
  //  View-Umschaltung (Visuell ↔ HTML) – synchron halten
  // ────────────────────────────────────────────────────────────

  function setView(view) {
    if (view === state.view && el.editorPanel.hidden === false) {
      // trotzdem Tabs/Anzeige korrekt setzen
    }
    if (view === 'html') {
      // Visuell → HTML: innerHTML in Textarea schreiben
      el.htmlEditor.value = el.visualEditor.innerHTML;
      el.visualWrap.hidden = true;
      el.htmlWrap.hidden = false;
      el.formatToolbar.classList.add('disabled');
    } else {
      // HTML → Visuell: Textarea-Wert in contenteditable schreiben
      el.visualEditor.innerHTML = el.htmlEditor.value;
      el.htmlWrap.hidden = true;
      el.visualWrap.hidden = false;
      el.formatToolbar.classList.remove('disabled');
    }
    state.view = view;
    el.tabVisual.classList.toggle('is-active', view === 'visual');
    el.tabHtml.classList.toggle('is-active', view === 'html');
    updatePreview();
  }

  // ────────────────────────────────────────────────────────────
  //  Vorschau (sandboxed iframe via srcdoc), debounced
  // ────────────────────────────────────────────────────────────

  const updatePreview = debounce(function () {
    const html = currentHtml();
    const doc = '<!DOCTYPE html><html lang="de"><head><meta charset="utf-8">' +
      '<style>html,body{margin:0;padding:0;}' +
      'body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;' +
      'color:#1f2a30;line-height:1.5;background:#eef1f4;padding:18px;}' +
      '.email-card{max-width:640px;margin:0 auto;background:#fff;padding:24px 28px;' +
      'border-radius:8px;box-shadow:0 1px 4px rgba(0,0,0,.12);}' +
      'img{max-width:100%;height:auto;}</style></head>' +
      '<body><div class="email-card">' + html + '</div></body></html>';
    el.previewFrame.srcdoc = doc;
  }, 250);

  // ────────────────────────────────────────────────────────────
  //  Formatierungs-Toolbar (document.execCommand)
  // ────────────────────────────────────────────────────────────

  function exec(cmd, value) {
    el.visualEditor.focus();
    try { document.execCommand(cmd, false, value); } catch (e) { /* alte Browser */ }
    afterVisualEdit();
  }

  function afterVisualEdit() {
    el.htmlEditor.value = el.visualEditor.innerHTML;
    markDirty();
    updatePreview();
  }

  function bindToolbar() {
    el.formatToolbar.querySelectorAll('.fmt-btn[data-cmd]').forEach((btn) => {
      btn.addEventListener('mousedown', (e) => e.preventDefault()); // Auswahl im Editor behalten
      btn.addEventListener('click', () => exec(btn.dataset.cmd));
    });
    el.fmtFontSize.addEventListener('change', () => {
      if (el.fmtFontSize.value) exec('fontSize', el.fmtFontSize.value);
      el.fmtFontSize.value = '';
    });
    el.fmtColor.addEventListener('input', () => {
      el.fmtColorSwatch.style.background = el.fmtColor.value;
    });
    el.fmtColor.addEventListener('change', () => {
      exec('foreColor', el.fmtColor.value);
    });
    el.fmtLink.addEventListener('mousedown', (e) => e.preventDefault());
    el.fmtLink.addEventListener('click', async () => {
      const res = await promptModal('Link einfügen', [
        { key: 'url', label: 'Adresse (URL)', placeholder: 'https://…', required: true, value: 'https://' },
      ]);
      if (res) exec('createLink', res.url.trim());
    });
    el.fmtImage.addEventListener('mousedown', (e) => e.preventDefault());
    el.fmtImage.addEventListener('click', async () => {
      const res = await promptModal('Bild einfügen', [
        { key: 'url', label: 'Bild-URL', placeholder: 'https://…/bild.png', required: true, value: 'https://' },
      ]);
      if (res) exec('insertImage', res.url.trim());
    });
  }

  // ────────────────────────────────────────────────────────────
  //  Speichern / Neu laden / Löschen
  // ────────────────────────────────────────────────────────────

  async function saveCurrent() {
    if (!state.current) return;
    // Sicherstellen, dass beide Editoren synchron sind (aus aktivem View lesen).
    const content = currentHtml();
    const friendly = state.current.friendly;
    const message = friendly + ' bearbeitet (Web-Editor)';
    try {
      const res = await api('/api/file', {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ path: state.current.path, content: content, message: message }),
      });
      state.current.exists = true;
      state.current.isNew = false;
      if (res.sha) state.current.sha = res.sha;
      setDirty(false);
      if (res.unchanged) toast('Keine Änderungen – nichts zu speichern.', 'success');
      else toast('„' + friendly + '“ gespeichert.', 'success');
      await loadTree(); // neue Dateien auftauchen lassen / SHAs aktualisieren
      highlightActive();
    } catch (e) {
      toast('Speichern fehlgeschlagen: ' + e.message, 'error');
    }
  }

  async function reloadCurrent() {
    if (!state.current) return;
    if (state.current.isNew) {
      toast('Diese Datei wurde noch nicht gespeichert.', 'error');
      return;
    }
    if (state.dirty) {
      const ok = await confirmModal('Ungespeicherte Änderungen verwerfen und Datei neu laden?', { title: 'Neu laden', okLabel: 'Verwerfen', danger: true });
      if (!ok) return;
    }
    try {
      const data = await api('/api/file?path=' + encodeURIComponent(state.current.path));
      state.current.sha = data.sha;
      state.current.exists = data.exists;
      setEditorContent(data.content || '');
      setDirty(false);
      setView('visual');
      toast('Datei neu geladen.', 'success');
    } catch (e) {
      toast('Neu laden fehlgeschlagen: ' + e.message, 'error');
    }
  }

  async function deleteCurrent() {
    if (!state.current) return;
    const friendly = state.current.friendly;
    // Noch nicht gespeicherte Datei → nur lokal verwerfen.
    if (state.current.isNew) {
      const ok = await confirmModal('Diese neue, noch nicht gespeicherte Datei verwerfen?', { title: 'Verwerfen', okLabel: 'Verwerfen', danger: true });
      if (!ok) return;
      setDirty(false);
      hideEditor();
      return;
    }
    const ok = await confirmModal('„' + friendly + '“ wirklich löschen? Dies kann nicht rückgängig gemacht werden.', { title: 'Löschen', okLabel: 'Löschen', danger: true });
    if (!ok) return;
    try {
      await api('/api/file', {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ path: state.current.path, message: friendly + ' gelöscht (Web-Editor)' }),
      });
      toast('„' + friendly + '“ gelöscht.', 'success');
      setDirty(false);
      hideEditor();
      await loadTree();
    } catch (e) {
      toast('Löschen fehlgeschlagen: ' + e.message, 'error');
    }
  }

  // ────────────────────────────────────────────────────────────
  //  Neue Dateien anlegen
  // ────────────────────────────────────────────────────────────

  async function newTemplate(folder) {
    const res = await promptModal('Neue Vorlage in „' + folder + '“', [
      { key: 'name', label: 'Vorlagenname', placeholder: 'z. B. Angebot Doppelzimmer', required: true, live: true, hint: '' },
    ], (values, inputs, root) => {
      const slug = slugifyName(values.name || '');
      const liveHint = root.querySelector('[data-live="name"]');
      if (liveHint) liveHint.innerHTML = slug ? 'Datei: <span class="preview-name">' + esc(slug) + '.html</span>' : 'Bitte einen Namen eingeben.';
    });
    if (!res) return;
    const slug = slugifyName(res.name);
    if (!slug) { toast('Ungültiger Name.', 'error'); return; }
    const path = folder + '/' + slug + '.html';
    if (await existsInTree(path)) { toast('Eine Vorlage mit diesem Namen existiert bereits.', 'error'); return; }
    openNewFile(path, slug, 'template');
  }

  async function newFooter() {
    const t = state.tree || {};
    const options = [{ value: '_default', label: 'Gemeinsam (alle Abteilungen)' }]
      .concat((t.departments || []).map((d) => ({ value: d, label: d })));
    const res = await promptModal('Neue Fußzeile', [
      { key: 'dept', label: 'Für welche Abteilung?', type: 'select', options: options, required: true },
    ]);
    if (!res) return;
    const file = (res.dept === '_default' ? '_default' : res.dept) + '.html';
    const path = SIG_FOOTERS + '/' + file;
    if (await existsInTree(path)) { toast('Diese Fußzeile existiert bereits.', 'error'); return; }
    openNewFile(path, 'Fußzeile: ' + footerLabel(file), 'footer');
  }

  async function newHeader() {
    const res = await promptModal('Neue Signatur', [
      { key: 'email', label: 'E-Mail-Adresse', placeholder: 'name@hotel-park-soltau.de', required: true, live: true },
      { key: 'name', label: 'Name', placeholder: 'Max Mustermann', required: true, live: true },
    ], (values, inputs, root) => {
      const email = (values.email || '').trim();
      const slug = slugifyHeaderName(values.name || '');
      const liveHint = root.querySelector('[data-live="name"]');
      const file = (email && slug) ? (email + '.' + slug + '.html') : '';
      if (liveHint) liveHint.innerHTML = file ? 'Datei: <span class="preview-name">' + esc(file) + '</span>' : 'E-Mail und Name eingeben.';
    });
    if (!res) return;
    const email = res.email.trim();
    const slug = slugifyHeaderName(res.name);
    if (!email || !slug) { toast('E-Mail und Name erforderlich.', 'error'); return; }
    const file = email + '.' + slug + '.html';
    const path = SIG_HEADERS + '/' + file;
    if (await existsInTree(path)) { toast('Diese Signatur existiert bereits.', 'error'); return; }
    openNewFile(path, 'Signatur: ' + headerLabel(file), 'header');
  }

  async function newDepartment() {
    const res = await promptModal('Neue Abteilung', [
      { key: 'name', label: 'Abteilungsname', placeholder: 'z. B. Rezeption', required: true, hint: 'Wird als Ordner im Repository angelegt.' },
    ]);
    if (!res) return;
    const name = res.name.trim();
    if (/[\/\\:*?"<>|]/.test(name)) { toast('Ungültiger Abteilungsname.', 'error'); return; }
    try {
      const r = await api('/api/departments', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name: name }),
      });
      toast('Abteilung „' + (r.name || name) + '“ angelegt.', 'success');
      await loadTree();
    } catch (e) {
      toast('Abteilung anlegen fehlgeschlagen: ' + e.message, 'error');
    }
  }

  // Prüfen, ob ein Pfad schon im aktuellen Baum vorkommt.
  function existsInTree(path) {
    const t = state.tree;
    if (!t) return false;
    const lists = [];
    Object.keys(t.templates || {}).forEach((k) => lists.push(t.templates[k]));
    Object.keys(t.users || {}).forEach((k) => lists.push(t.users[k]));
    lists.push(t.footers || [], t.headers || []);
    return lists.some((arr) => (arr || []).some((f) => f.path === path));
  }

  // ────────────────────────────────────────────────────────────
  //  Event-Bindungen
  // ────────────────────────────────────────────────────────────

  function bindEvents() {
    // Sektionen ein-/ausklappen
    document.querySelectorAll('.section-toggle').forEach((btn) => {
      btn.addEventListener('click', () => {
        const key = btn.dataset.toggle;
        state.collapsed[key] = !state.collapsed[key];
        applySectionCollapse();
      });
    });

    // Sidebar-Aktionen
    el.btnRefresh.addEventListener('click', loadTree);
    if (el.treeSearch) el.treeSearch.addEventListener('input', applyTreeFilter);
    el.btnNewDept.addEventListener('click', (e) => { e.stopPropagation(); newDepartment(); });
    el.btnNewFooter.addEventListener('click', (e) => { e.stopPropagation(); newFooter(); });
    el.btnNewHeader.addEventListener('click', (e) => { e.stopPropagation(); newHeader(); });

    // Editor-Aktionen
    el.btnSave.addEventListener('click', saveCurrent);
    el.btnReload.addEventListener('click', reloadCurrent);
    el.btnDelete.addEventListener('click', deleteCurrent);

    // View-Tabs
    el.tabVisual.addEventListener('click', () => setView('visual'));
    el.tabHtml.addEventListener('click', () => setView('html'));

    // Visuell editieren
    el.visualEditor.addEventListener('input', afterVisualEdit);
    // HTML editieren
    el.htmlEditor.addEventListener('input', () => {
      markDirty();
      updatePreview();
    });

    // Toolbar
    bindToolbar();
    el.fmtColorSwatch.style.background = el.fmtColor.value;

    // Tastenkürzel: Strg/Cmd+S = Speichern
    document.addEventListener('keydown', (e) => {
      if ((e.ctrlKey || e.metaKey) && (e.key === 's' || e.key === 'S')) {
        e.preventDefault();
        if (state.current && !el.btnSave.disabled) saveCurrent();
      }
      // Escape schließt offene Modals
      if (e.key === 'Escape') {
        if (!el.promptBackdrop.hidden) el.promptCancel.click();
        else if (!el.confirmBackdrop.hidden) el.confirmCancel.click();
      }
    });

    // Vor Verlassen warnen, wenn ungespeichert
    window.addEventListener('beforeunload', (e) => {
      if (state.dirty) {
        e.preventDefault();
        e.returnValue = '';
        return '';
      }
    });
  }

  // ────────────────────────────────────────────────────────────
  //  Start
  // ────────────────────────────────────────────────────────────

  async function init() {
    bindEvents();
    setDirty(false);
    const ok = await loadConfigAndHealth();
    if (ok) {
      await loadTree();
    } else if (state.config && !state.config.configured) {
      // Banner ist sichtbar; kein Baum-Laden möglich.
    }
  }

  document.addEventListener('DOMContentLoaded', init);
})();