Forge-Engine/static/document/js/document-editor.js

// document-editor.js — éditeur de support de formation (voir
// docs/plan/PLAN.md). État MUTABLE partagé sur window.forgeDocState
// (jamais let/const au premier niveau de ce fichier, voir static/pjax.js —
// un <script src> de page est rejoué tel quel à chaque navigation pjax,
// une redéclaration lèverait "already declared" ; seul `var` est sûr à
// rejouer). Toute mutation passe par le serveur (AJAX) puis rafraîchit le
// canevas depuis SA réponse (jamais un état simulé côté client) —
// Undo/Redo est une PILE DE COMMANDES qui rejoue ces mêmes appels AJAX en
// sens inverse, pas un simple instantané visuel.

// Constante immuable au premier niveau : `let`/`const` lèverait "already
// declared" à la 2e exécution de ce script par pjax.js (voir l'en-tête
// ci-dessus), `var` est le seul choix sûr ici.
// eslint-disable-next-line no-var, vars-on-top
var FORGE_DOC_STYLE_PRESETS = {
  titre1: 'Titre 1',
  titre2: 'Titre 2',
  paragraphe: 'Paragraphe',
  legende: 'Légende',
};

// Même raison que FORGE_DOC_STYLE_PRESETS ci-dessus.
// eslint-disable-next-line no-var, vars-on-top
var FORGE_DOC_SHAPE_KINDS = ['rectangle', 'cercle', 'triangle', 'trait'];

function forgeDocIsShapeKind(kind) {
  return FORGE_DOC_SHAPE_KINDS.includes(kind);
}

function forgeDocChildrenOf(parentId) {
  return window.forgeDocState.elements
    .filter((el) => el.parent_id === parentId)
    .sort((a, b) => a.order_index - b.order_index);
}

function forgeDocTopLevel() {
  return forgeDocChildrenOf(null);
}

function forgeDocRebuildIndex() {
  const byId = {};
  window.forgeDocState.elements.forEach((el) => { byId[el.id] = el; });
  window.forgeDocState.elementsById = byId;
}

/* ---------------------------------------------------------------------
 * Appels serveur — un seul point de vérité par opération (voir
 * routes/document/), jamais dupliqué côté client.
 * ------------------------------------------------------------------- */

function forgeDocApiAdd(kind, parentId) {
  const body = new URLSearchParams();
  body.set('kind', kind);
  if (parentId !== null && parentId !== undefined) body.set('parent_id', String(parentId));
  return fetch(`/document/${window.forgeDocState.slug}/elements/add`, { method: 'POST', body })
    .then((r) => r.json());
}

function forgeDocApiUpdate(id, attributes) {
  return fetch(`/document/${window.forgeDocState.slug}/elements/${id}/update`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(attributes),
  }).then((r) => r.json());
}

function forgeDocApiMove(id, newParentId, newIndex) {
  return fetch(`/document/${window.forgeDocState.slug}/elements/${id}/move`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ new_parent_id: newParentId, new_index: newIndex }),
  }).then((r) => r.json());
}

function forgeDocApiDelete(id) {
  return fetch(`/document/${window.forgeDocState.slug}/elements/${id}/delete`, { method: 'POST' })
    .then((r) => r.json());
}

function forgeDocApiRender() {
  return fetch(`/document/${window.forgeDocState.slug}/render`).then((r) => r.json());
}

/* ---------------------------------------------------------------------
 * Canevas — rafraîchi depuis la VÉRITÉ SERVEUR après chaque mutation
 * structurelle (jamais une simple retouche DOM locale, voir
 * routes/document/document_render.py).
 * ------------------------------------------------------------------- */

function forgeDocApplySelectionClass() {
  document.querySelectorAll('#docPage .docSelected').forEach((d) => d.classList.remove('docSelected'));
  const { selectedId } = window.forgeDocState;
  if (selectedId === null) return;
  const dom = document.querySelector(`[data-element-id="${selectedId}"]`);
  if (dom) dom.classList.add('docSelected');
}

function forgeDocRefreshCanvas() {
  return forgeDocApiRender().then((data) => {
    document.getElementById('docPageContent').innerHTML = data.html;
    window.forgeDocState.elements = data.elements;
    forgeDocRebuildIndex();
    forgeDocBindCanvasInteractions();
    const { selectedId } = window.forgeDocState;
    if (selectedId !== null && window.forgeDocState.elementsById[selectedId]) {
      forgeDocApplySelectionClass();
    } else {
      window.forgeDocState.selectedId = null;
      forgeDocRenderProps(null);
    }
  });
}

/* ---------------------------------------------------------------------
 * Undo/Redo — pile de COMMANDES {undo, redo}, chacune rejouant les mêmes
 * appels AJAX que l'action d'origine (voir docs/plan/PLAN.md).
 * ------------------------------------------------------------------- */

function forgeDocUpdateHistoryButtons() {
  const undoBtn = document.getElementById('docUndoBtn');
  const redoBtn = document.getElementById('docRedoBtn');
  if (undoBtn) undoBtn.disabled = window.forgeDocState.undoStack.length === 0;
  if (redoBtn) redoBtn.disabled = window.forgeDocState.redoStack.length === 0;
}

function forgeDocPushCommand(command) {
  window.forgeDocState.undoStack.push(command);
  window.forgeDocState.redoStack = [];
  forgeDocUpdateHistoryButtons();
}

function forgeDocUndo() {
  const command = window.forgeDocState.undoStack.pop();
  if (!command) return;
  command.undo().then(forgeDocRefreshCanvas).then(() => {
    window.forgeDocState.redoStack.push(command);
    forgeDocUpdateHistoryButtons();
  });
}

function forgeDocRedo() {
  const command = window.forgeDocState.redoStack.pop();
  if (!command) return;
  command.redo().then(forgeDocRefreshCanvas).then(() => {
    window.forgeDocState.undoStack.push(command);
    forgeDocUpdateHistoryButtons();
  });
}

/* ---------------------------------------------------------------------
 * Mutations de haut niveau — chacune exécute son action puis pousse la
 * commande d'annulation correspondante.
 * ------------------------------------------------------------------- */

function forgeDocAddElement(kind, parentId) {
  const state = { parentId: parentId === undefined ? null : parentId };
  function perform() {
    return forgeDocApiAdd(kind, state.parentId).then((result) => { state.id = result.id; });
  }
  return perform().then(() => {
    forgeDocPushCommand({
      undo: () => forgeDocApiDelete(state.id),
      redo: perform,
    });
    return forgeDocRefreshCanvas().then(() => forgeDocSelectElement(state.id));
  });
}

function forgeDocDeleteElement(id) {
  const el = window.forgeDocState.elementsById[id];
  if (!el) return Promise.resolve();
  const state = {
    id, parentId: el.parent_id, index: el.order_index, kind: el.kind, attributes: el.attributes,
  };
  return forgeDocApiDelete(state.id).then(() => {
    forgeDocPushCommand({
      undo: () => forgeDocApiAdd(state.kind, state.parentId).then((r) => {
        state.id = r.id;
        return forgeDocApiUpdate(state.id, state.attributes)
          .then(() => forgeDocApiMove(state.id, state.parentId, state.index));
      }),
      redo: () => forgeDocApiDelete(state.id),
    });
    window.forgeDocState.selectedId = null;
    return forgeDocRefreshCanvas();
  });
}

function forgeDocUpdateAttributes(id, newAttributes) {
  const el = window.forgeDocState.elementsById[id];
  if (!el) return Promise.resolve();
  const oldAttributes = { ...el.attributes };
  return forgeDocApiUpdate(id, newAttributes).then((result) => {
    forgeDocPushCommand({
      undo: () => forgeDocApiUpdate(id, oldAttributes),
      redo: () => forgeDocApiUpdate(id, newAttributes),
    });
    // Le serveur revalide/nettoie certains kinds (quiz — voir
    // routes/document/document_element_update.py) : on adopte SA version,
    // jamais celle envoyée telle quelle, pour ne jamais dériver de la
    // vérité persistée (ex. un choix en trop silencieusement tronqué).
    el.attributes = result.attributes || newAttributes;
    const dom = document.querySelector(`[data-element-id="${id}"]`);
    if (dom && result.rendered_html) {
      const wrapper = document.createElement('div');
      wrapper.innerHTML = result.rendered_html;
      dom.replaceWith(wrapper.firstElementChild);
      forgeDocBindCanvasInteractions();
      forgeDocApplySelectionClass();
    }
  });
}

/* ---------------------------------------------------------------------
 * Moteur de layout — glisser-déposer réel (voir docs/plan/PLAN.md §1.2.B) :
 * dépose sur la moitié gauche/droite de la boîte englobante d'un élément
 * -> rejoint sa rangée (créée à la volée si besoin) ; moitié haute/basse
 * -> nouvelle position au top-niveau, avant/après.
 * ------------------------------------------------------------------- */

function forgeDocFindDropTarget(clientX, clientY) {
  const candidates = Array.from(document.querySelectorAll('#docPage [data-element-id]'))
    .filter((dom) => !forgeDocIsShapeKind(dom.dataset.kind));
  let best = null;
  let bestDist = Infinity;
  candidates.forEach((dom) => {
    const rect = dom.getBoundingClientRect();
    const dist = Math.hypot(clientX - (rect.left + rect.width / 2), clientY - (rect.top + rect.height / 2));
    if (dist < bestDist) { bestDist = dist; best = dom; }
  });
  return best;
}

function forgeDocComputeDropPlacement(targetDom, clientX, clientY) {
  const rect = targetDom.getBoundingClientRect();
  const relX = (clientX - rect.left) / rect.width;
  const relY = (clientY - rect.top) / rect.height;
  const targetId = Number.parseInt(targetDom.dataset.elementId, 10);
  const targetEl = window.forgeDocState.elementsById[targetId];
  if (relY < 0.25) return { mode: 'before', targetEl };
  if (relY > 0.75) return { mode: 'after', targetEl };
  return { mode: relX < 0.5 ? 'mergeLeft' : 'mergeRight', targetEl };
}

function forgeDocShowDropHighlight(targetDom, mode) {
  document.querySelectorAll('.docDropTarget').forEach((d) => {
    d.classList.remove('docDropTarget', 'docDropTarget--before', 'docDropTarget--after', 'docDropTarget--mergeLeft', 'docDropTarget--mergeRight');
  });
  targetDom.classList.add('docDropTarget', `docDropTarget--${mode}`);
}

function forgeDocClearDropHighlight() {
  document.querySelectorAll('.docDropTarget').forEach((d) => {
    d.classList.remove('docDropTarget', 'docDropTarget--before', 'docDropTarget--after', 'docDropTarget--mergeLeft', 'docDropTarget--mergeRight');
  });
}

function forgeDocDropLibraryItem(kind, placement) {
  const { targetEl } = placement;
  const state = {};

  function performForward() {
    if (placement.mode === 'mergeLeft' || placement.mode === 'mergeRight') {
      if (targetEl.parent_id !== null) {
        const siblings = forgeDocChildrenOf(targetEl.parent_id);
        const pos = siblings.findIndex((s) => s.id === targetEl.id);
        state.index = placement.mode === 'mergeLeft' ? pos : pos + 1;
        state.createdRow = false;
        return forgeDocApiAdd(kind, targetEl.parent_id).then((r) => {
          state.newId = r.id;
          return forgeDocApiMove(state.newId, targetEl.parent_id, state.index);
        });
      }
      state.createdRow = true;
      state.topPos = forgeDocTopLevel().findIndex((s) => s.id === targetEl.id);
      return forgeDocApiAdd('row', null).then((rowResult) => {
        state.rowId = rowResult.id;
        return forgeDocApiMove(state.rowId, null, state.topPos)
          .then(() => forgeDocApiMove(targetEl.id, state.rowId, 0))
          .then(() => forgeDocApiAdd(kind, state.rowId))
          .then((r) => {
            state.newId = r.id;
            state.index = placement.mode === 'mergeLeft' ? 0 : 1;
            return forgeDocApiMove(state.newId, state.rowId, state.index);
          });
      });
    }
    const anchorId = targetEl.parent_id !== null ? targetEl.parent_id : targetEl.id;
    const anchorPos = forgeDocTopLevel().findIndex((s) => s.id === anchorId);
    state.index = placement.mode === 'before' ? anchorPos : anchorPos + 1;
    state.createdRow = false;
    return forgeDocApiAdd(kind, null).then((r) => {
      state.newId = r.id;
      return forgeDocApiMove(state.newId, null, state.index);
    });
  }

  function performUndo() {
    const deleteNew = forgeDocApiDelete(state.newId);
    if (!state.createdRow) return deleteNew;
    return deleteNew
      .then(() => forgeDocApiMove(targetEl.id, null, state.topPos))
      .then(() => forgeDocApiDelete(state.rowId));
  }

  return performForward().then(() => {
    forgeDocPushCommand({ undo: performUndo, redo: performForward });
    return forgeDocRefreshCanvas().then(() => forgeDocSelectElement(state.newId));
  });
}

function forgeDocDropExistingElement(draggedId, placement) {
  const draggedEl = window.forgeDocState.elementsById[draggedId];
  const { targetEl } = placement;
  if (!draggedEl || draggedEl.id === targetEl.id || targetEl.parent_id === draggedId) return Promise.resolve();
  const isMerge = placement.mode === 'mergeLeft' || placement.mode === 'mergeRight';
  if (draggedEl.kind === 'row' && isMerge) return Promise.resolve();

  const fromParentId = draggedEl.parent_id;
  const fromIndex = draggedEl.order_index;
  const state = {};

  function performForward() {
    if (isMerge) {
      if (targetEl.parent_id !== null) {
        const siblings = forgeDocChildrenOf(targetEl.parent_id).filter((s) => s.id !== draggedId);
        const pos = siblings.findIndex((s) => s.id === targetEl.id);
        state.rowId = targetEl.parent_id;
        state.index = placement.mode === 'mergeLeft' ? pos : pos + 1;
        state.createdRow = false;
        return forgeDocApiMove(draggedId, state.rowId, state.index);
      }
      state.createdRow = true;
      state.topPos = forgeDocTopLevel().filter((s) => s.id !== draggedId).findIndex((s) => s.id === targetEl.id);
      return forgeDocApiAdd('row', null).then((rowResult) => {
        state.rowId = rowResult.id;
        return forgeDocApiMove(state.rowId, null, state.topPos)
          .then(() => forgeDocApiMove(targetEl.id, state.rowId, 0))
          .then(() => {
            state.index = placement.mode === 'mergeLeft' ? 0 : 1;
            return forgeDocApiMove(draggedId, state.rowId, state.index);
          });
      });
    }
    const anchorId = targetEl.parent_id !== null ? targetEl.parent_id : targetEl.id;
    const anchorPos = forgeDocTopLevel().filter((s) => s.id !== draggedId).findIndex((s) => s.id === anchorId);
    state.index = placement.mode === 'before' ? anchorPos : anchorPos + 1;
    state.createdRow = false;
    return forgeDocApiMove(draggedId, null, state.index);
  }

  function performUndo() {
    const restore = forgeDocApiMove(draggedId, fromParentId, fromIndex);
    if (!state.createdRow) return restore;
    return restore
      .then(() => forgeDocApiMove(targetEl.id, null, state.topPos))
      .then(() => forgeDocApiDelete(state.rowId));
  }

  return performForward().then(() => {
    forgeDocPushCommand({ undo: performUndo, redo: performForward });
    return forgeDocRefreshCanvas();
  });
}

function forgeDocBindLibraryDragHandlers() {
  document.querySelectorAll('.docLibItem[data-add]').forEach((item) => {
    item.addEventListener('dragstart', (e) => {
      e.dataTransfer.setData('text/forge-doc-add', item.dataset.add);
      e.dataTransfer.effectAllowed = 'copy';
    });
    item.addEventListener('click', () => { forgeDocAddElement(item.dataset.add, null); });
  });
}

function forgeDocBindCanvasDropZone() {
  const docPage = document.getElementById('docPage');
  docPage.addEventListener('dragover', (e) => {
    const isAdd = e.dataTransfer.types.includes('text/forge-doc-add');
    const isMove = e.dataTransfer.types.includes('text/forge-doc-move');
    if (!isAdd && !isMove) return;
    e.preventDefault();
    const target = forgeDocFindDropTarget(e.clientX, e.clientY);
    if (!target) { forgeDocClearDropHighlight(); return; }
    const placement = forgeDocComputeDropPlacement(target, e.clientX, e.clientY);
    forgeDocShowDropHighlight(target, placement.mode);
  });
  docPage.addEventListener('dragleave', (e) => {
    if (e.target === docPage) forgeDocClearDropHighlight();
  });
  docPage.addEventListener('drop', (e) => {
    e.preventDefault();
    forgeDocClearDropHighlight();
    const target = forgeDocFindDropTarget(e.clientX, e.clientY);
    if (!target) return;
    const placement = forgeDocComputeDropPlacement(target, e.clientX, e.clientY);
    const addKind = e.dataTransfer.getData('text/forge-doc-add');
    const moveId = e.dataTransfer.getData('text/forge-doc-move');
    if (addKind) { forgeDocDropLibraryItem(addKind, placement); return; }
    if (moveId) forgeDocDropExistingElement(Number.parseInt(moveId, 10), placement);
  });
}

/* ---------------------------------------------------------------------
 * Formes libres — position absolue, glissées à la souris (pas de HTML5
 * DnD, pas de logique de rangée) avec grille d'accroche réelle.
 * ------------------------------------------------------------------- */

// Même raison que FORGE_DOC_STYLE_PRESETS en tête de fichier.
// eslint-disable-next-line no-var, vars-on-top
var FORGE_DOC_SNAP_SIZE = 8;

function forgeDocBindShapeDrag(dom, elementId) {
  dom.addEventListener('mousedown', (e) => {
    if (window.forgeDocState.previewMode) return;
    e.preventDefault();
    e.stopPropagation();
    forgeDocSelectElement(elementId);
    const el = window.forgeDocState.elementsById[elementId];
    window.forgeDocState.shapeDrag = {
      id: elementId,
      startX: e.clientX,
      startY: e.clientY,
      origX: el.attributes.x,
      origY: el.attributes.y,
    };
    document.getElementById('docPage').classList.add('docPage--dragging-shape');
  });
}

function forgeDocBindShapeDragGlobalHandlers() {
  document.addEventListener('mousemove', (e) => {
    const drag = window.forgeDocState.shapeDrag;
    if (!drag) return;
    const zoomFactor = window.forgeDocState.zoom / 100;
    const dx = (e.clientX - drag.startX) / zoomFactor;
    const dy = (e.clientY - drag.startY) / zoomFactor;
    const newX = Math.round((drag.origX + dx) / FORGE_DOC_SNAP_SIZE) * FORGE_DOC_SNAP_SIZE;
    const newY = Math.round((drag.origY + dy) / FORGE_DOC_SNAP_SIZE) * FORGE_DOC_SNAP_SIZE;
    const dom = document.querySelector(`[data-element-id="${drag.id}"]`);
    if (dom) { dom.style.left = `${newX}px`; dom.style.top = `${newY}px`; }
    drag.lastX = newX;
    drag.lastY = newY;
  });
  document.addEventListener('mouseup', () => {
    const drag = window.forgeDocState.shapeDrag;
    if (!drag) return;
    window.forgeDocState.shapeDrag = null;
    document.getElementById('docPage').classList.remove('docPage--dragging-shape');
    if (typeof drag.lastX === 'number' && (drag.lastX !== drag.origX || drag.lastY !== drag.origY)) {
      const el = window.forgeDocState.elementsById[drag.id];
      forgeDocUpdateAttributes(drag.id, { ...el.attributes, x: drag.lastX, y: drag.lastY });
    }
  });
}

/* ---------------------------------------------------------------------
 * Sélection & panneau Propriétés.
 * ------------------------------------------------------------------- */

function forgeDocBindCanvasInteractions() {
  document.querySelectorAll('#docPage [data-element-id]').forEach((dom) => {
    const elementId = Number.parseInt(dom.dataset.elementId, 10);
    dom.addEventListener('click', (e) => {
      e.stopPropagation();
      forgeDocSelectElement(elementId);
    });
    if (forgeDocIsShapeKind(dom.dataset.kind)) {
      forgeDocBindShapeDrag(dom, elementId);
    } else {
      dom.setAttribute('draggable', 'true');
      dom.addEventListener('dragstart', (e) => {
        e.dataTransfer.setData('text/forge-doc-move', String(elementId));
        e.dataTransfer.effectAllowed = 'move';
      });
    }
  });
  forgeDocInitQuizPlayers();
}

/* ---------------------------------------------------------------------
 * Quiz — questionnaire RÉELLEMENT interactif en Mode Aperçu (voir
 * docs/plan/maquettes/document-formation-web.html, référence visuelle).
 * État tenu en mémoire (jamais persisté — une session d'Aperçu se
 * réinitialise à chaque rafraîchissement du canevas, exactement comme le
 * reste de l'éditeur).
 * ------------------------------------------------------------------- */

function forgeDocQuizPlayerQuestions(playerEl) {
  try {
    const config = JSON.parse(playerEl.dataset.quizConfig || '{}');
    return Array.isArray(config.questions) ? config.questions : [];
  } catch (e) {
    return [];
  }
}

function forgeDocRenderQuizPlayerQuestion(playerEl, state) {
  state.answered = false;
  const item = state.questions[state.current];
  const textEl = playerEl.querySelector('.docQuizQuestionText');
  const optionsEl = playerEl.querySelector('.docQuizOptions');
  const feedbackEl = playerEl.querySelector('.docQuizFeedback');
  const nextBtn = playerEl.querySelector('.docQuizNextBtn');
  const fillEl = playerEl.querySelector('.docQuizProgressFill');
  const progEl = playerEl.querySelector('.docQuizProg');
  const scoreEl = playerEl.querySelector('.docQuizScore');
  const letters = ['A', 'B', 'C', 'D'];

  textEl.textContent = item.text;
  optionsEl.innerHTML = '';
  feedbackEl.className = 'docQuizFeedback';
  feedbackEl.textContent = '';
  nextBtn.classList.remove('is-visible');
  item.choices.forEach((choice, idx) => {
    const btn = document.createElement('button');
    btn.type = 'button';
    btn.className = 'docQuizOption';
    btn.innerHTML = `<span class="docQuizOptionLetter">${letters[idx]}</span><span></span>`;
    btn.querySelector('span:last-child').textContent = choice;
    btn.addEventListener('click', (e) => {
      e.stopPropagation();
      forgeDocQuizPlayerAnswer(playerEl, state, idx, btn);
    });
    optionsEl.appendChild(btn);
  });
  fillEl.style.width = `${(state.current / state.questions.length) * 100}%`;
  progEl.textContent = `Question ${state.current + 1} sur ${state.questions.length}`;
  scoreEl.textContent = `Score : ${state.score}`;
}

function forgeDocQuizPlayerAnswer(playerEl, state, idx, btn) {
  if (state.answered) return;
  state.answered = true;
  const item = state.questions[state.current];
  const options = playerEl.querySelectorAll('.docQuizOption');
  options.forEach((o) => { o.disabled = true; });
  const feedbackEl = playerEl.querySelector('.docQuizFeedback');
  const nextBtn = playerEl.querySelector('.docQuizNextBtn');
  const scoreEl = playerEl.querySelector('.docQuizScore');
  if (idx === item.correct_index) {
    btn.classList.add('is-correct');
    state.score += item.points || 0;
    feedbackEl.classList.add('is-visible', 'is-ok');
    feedbackEl.textContent = 'Bonne réponse !';
  } else {
    btn.classList.add('is-wrong');
    options[item.correct_index].classList.add('is-correct');
    feedbackEl.classList.add('is-visible', 'is-ko');
    feedbackEl.textContent = 'Mauvaise réponse.';
  }
  scoreEl.textContent = `Score : ${state.score}`;
  nextBtn.classList.add('is-visible');
  nextBtn.textContent = state.current === state.questions.length - 1 ? 'Voir le résultat' : 'Question suivante';
}

function forgeDocQuizPlayerTotalPoints(state) {
  return state.questions.reduce((sum, q) => sum + (q.points || 0), 0);
}

function forgeDocShowQuizPlayerResult(playerEl, state) {
  playerEl.querySelector('.docQuizCard').style.display = 'none';
  const resultCard = playerEl.querySelector('.docQuizResultCard');
  resultCard.style.display = 'block';
  playerEl.querySelector('.docQuizProgressFill').style.width = '100%';
  playerEl.querySelector('.docQuizResultBig').textContent = `${state.score} / ${forgeDocQuizPlayerTotalPoints(state)}`;
  playerEl.querySelector('.docQuizResultSub').textContent = 'points obtenus';
}

function forgeDocQuizPlayerNext(playerEl, state) {
  state.current += 1;
  if (state.current < state.questions.length) {
    forgeDocRenderQuizPlayerQuestion(playerEl, state);
  } else {
    forgeDocShowQuizPlayerResult(playerEl, state);
  }
}

function forgeDocQuizPlayerRestart(playerEl, state) {
  state.current = 0;
  state.score = 0;
  playerEl.querySelector('.docQuizResultCard').style.display = 'none';
  playerEl.querySelector('.docQuizCard').style.display = 'block';
  forgeDocRenderQuizPlayerQuestion(playerEl, state);
}

function forgeDocInitQuizPlayers() {
  document.querySelectorAll('.docQuizPlayer').forEach((playerEl) => {
    const questions = forgeDocQuizPlayerQuestions(playerEl);
    if (!questions.length) return;
    const state = {
      current: 0, score: 0, answered: false, questions,
    };
    forgeDocRenderQuizPlayerQuestion(playerEl, state);
    playerEl.querySelector('.docQuizNextBtn').addEventListener('click', (e) => {
      e.stopPropagation();
      forgeDocQuizPlayerNext(playerEl, state);
    });
    playerEl.querySelector('.docQuizRestartBtn').addEventListener('click', (e) => {
      e.stopPropagation();
      forgeDocQuizPlayerRestart(playerEl, state);
    });
  });
}

function forgeDocSetActiveBottomNav(target) {
  document.querySelectorAll('#docBottomNav button').forEach((b) => {
    b.classList.toggle('is-active', b.dataset.target === target);
  });
}

function forgeDocSelectElement(id) {
  window.forgeDocState.selectedId = id;
  forgeDocApplySelectionClass();
  forgeDocRenderProps(window.forgeDocState.elementsById[id]);
  if (window.innerWidth <= 900) {
    document.getElementById('docSidebarLeft').classList.remove('is-open');
    document.getElementById('docSidebarRight').classList.add('is-open');
    forgeDocSetActiveBottomNav('right');
  }
}

function forgeDocPropsHeader(label) {
  return `<div class="docSectionLabel">Propriétés — ${label}</div>`;
}

function forgeDocDeleteButtonHtml() {
  return '<button type="button" class="docDeleteBtn" id="docDeletePropBtn">🗑 Supprimer cet élément</button>';
}

function forgeDocRenderTextProps(panel, el) {
  const a = el.attributes;
  panel.innerHTML = `
    ${forgeDocPropsHeader('texte')}
    <div class="docField">
      <span class="docFieldLabel">Style</span>
      <div class="docSegmented" id="docStyleSeg">
        ${Object.keys(FORGE_DOC_STYLE_PRESETS).map((key) => `<button type="button" class="docSegBtn ${a.style === key ? 'is-active' : ''}" data-style="${key}">${FORGE_DOC_STYLE_PRESETS[key]}</button>`).join('')}
      </div>
    </div>
    <div class="docField"><label for="docContentInput">Contenu</label><textarea id="docContentInput" rows="3">${a.content}</textarea></div>
    <div class="docField">
      <span class="docFieldLabel">Mise en forme</span>
      <div class="docToolbarRow">
        <button type="button" class="docFmtBtn ${a.bold ? 'is-active' : ''}" id="docBoldBtn" title="Gras">B</button>
        <button type="button" class="docFmtBtn docFmtBtn--italic ${a.italic ? 'is-active' : ''}" id="docItalicBtn" title="Italique">I</button>
        <button type="button" class="docFmtBtn docFmtBtn--underline ${a.underline ? 'is-active' : ''}" id="docUnderlineBtn" title="Souligné">U</button>
      </div>
    </div>
    <div class="docField">
      <span class="docFieldLabel">Alignement</span>
      <div class="docToolbarRow" id="docAlignRow">
        <button type="button" class="docFmtBtn ${a.align === 'left' ? 'is-active' : ''}" data-align="left">◧</button>
        <button type="button" class="docFmtBtn ${a.align === 'center' ? 'is-active' : ''}" data-align="center">▣</button>
        <button type="button" class="docFmtBtn ${a.align === 'right' ? 'is-active' : ''}" data-align="right">◨</button>
      </div>
    </div>
    <div class="docField">
      <span class="docFieldLabel">Couleur du texte</span>
      <div class="docSwatches" id="docColorSwatches">
        ${['var(--doc-text)', 'var(--doc-muted)', '#ff5f2e', '#ffb020'].map((c) => `<div class="docSwatch ${a.color === c ? 'is-active' : ''}" data-color="${c}" style="background:${c.replace('doc-', 'forge-').replace('var(--forge-text)', 'var(--forge-text)')};"></div>`).join('')}
      </div>
    </div>
    ${forgeDocDeleteButtonHtml()}
  `;

  function patch(partial) { forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }); }

  document.getElementById('docContentInput').addEventListener('change', (e) => patch({ content: e.target.value }));
  panel.querySelectorAll('#docStyleSeg .docSegBtn').forEach((btn) => {
    btn.addEventListener('click', () => patch({ style: btn.dataset.style }));
  });
  document.getElementById('docBoldBtn').addEventListener('click', () => patch({ bold: !a.bold }));
  document.getElementById('docItalicBtn').addEventListener('click', () => patch({ italic: !a.italic }));
  document.getElementById('docUnderlineBtn').addEventListener('click', () => patch({ underline: !a.underline }));
  panel.querySelectorAll('#docAlignRow [data-align]').forEach((btn) => {
    btn.addEventListener('click', () => patch({ align: btn.dataset.align }));
  });
  panel.querySelectorAll('#docColorSwatches .docSwatch').forEach((sw) => {
    sw.addEventListener('click', () => patch({ color: sw.dataset.color }));
  });
}

function forgeDocRenderShapeProps(panel, el) {
  const a = el.attributes;
  panel.innerHTML = `
    ${forgeDocPropsHeader('forme')}
    <div class="docField"><label for="docShapeLabel">Libellé</label><input type="text" id="docShapeLabel" value="${a.label || ''}"></div>
    <div class="docFieldRow"><label for="docShapeX">Position X</label><input type="number" id="docShapeX" value="${a.x}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeY">Position Y</label><input type="number" id="docShapeY" value="${a.y}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeWidth">Largeur</label><input type="number" id="docShapeWidth" value="${a.width}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeHeight">Hauteur</label><input type="number" id="docShapeHeight" value="${a.height}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeRotation">Rotation (°)</label><input type="number" id="docShapeRotation" value="${a.rotation}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeZ">Ordre (z-index)</label><input type="number" id="docShapeZ" value="${a.z_index}" style="width:90px;"></div>
    <div class="docFieldRow"><label for="docShapeFill">Couleur de remplissage</label><input type="color" id="docShapeFill" value="${a.fill}"></div>
    <div class="docFieldRow"><label for="docShapeStroke">Couleur de bordure</label><input type="color" id="docShapeStroke" value="${a.stroke}"></div>
    <div class="docFieldRow"><label for="docShapeStrokeWidth">Épaisseur de bordure</label><input type="number" id="docShapeStrokeWidth" value="${a.stroke_width}" style="width:90px;"></div>
    ${forgeDocDeleteButtonHtml()}
  `;

  function patch(partial) { forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }); }

  document.getElementById('docShapeLabel').addEventListener('change', (e) => patch({ label: e.target.value }));
  document.getElementById('docShapeX').addEventListener('change', (e) => patch({ x: Number(e.target.value) }));
  document.getElementById('docShapeY').addEventListener('change', (e) => patch({ y: Number(e.target.value) }));
  document.getElementById('docShapeWidth').addEventListener('change', (e) => patch({ width: Number(e.target.value) }));
  document.getElementById('docShapeHeight').addEventListener('change', (e) => patch({ height: Number(e.target.value) }));
  document.getElementById('docShapeRotation').addEventListener('change', (e) => patch({ rotation: Number(e.target.value) }));
  document.getElementById('docShapeZ').addEventListener('change', (e) => patch({ z_index: Number(e.target.value) }));
  document.getElementById('docShapeFill').addEventListener('input', (e) => patch({ fill: e.target.value }));
  document.getElementById('docShapeStroke').addEventListener('input', (e) => patch({ stroke: e.target.value }));
  document.getElementById('docShapeStrokeWidth').addEventListener('change', (e) => patch({ stroke_width: Number(e.target.value) }));
}

function forgeDocRenderImageProps(panel, el) {
  const a = el.attributes;
  panel.innerHTML = `
    ${forgeDocPropsHeader('image')}
    <div class="docField"><label for="docImageSrc">URL de l'image</label><input type="text" id="docImageSrc" value="${a.src || ''}" placeholder="https://..."></div>
    <div class="docField"><label for="docImageAlt">Texte alternatif</label><input type="text" id="docImageAlt" value="${a.alt || ''}"></div>
    ${forgeDocDeleteButtonHtml()}
  `;
  function patch(partial) { forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }); }
  document.getElementById('docImageSrc').addEventListener('change', (e) => patch({ src: e.target.value.trim() }));
  document.getElementById('docImageAlt').addEventListener('change', (e) => patch({ alt: e.target.value }));
}

function forgeDocRenderButtonProps(panel, el) {
  const a = el.attributes;
  panel.innerHTML = `
    ${forgeDocPropsHeader('bouton')}
    <div class="docField"><label for="docButtonLabel">Texte du bouton</label><input type="text" id="docButtonLabel" value="${a.label || ''}"></div>
    <div class="docField"><label for="docButtonTarget">Cible (URL ou ancre)</label><input type="text" id="docButtonTarget" value="${a.target || ''}"></div>
    ${forgeDocDeleteButtonHtml()}
  `;
  function patch(partial) { forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }); }
  document.getElementById('docButtonLabel').addEventListener('change', (e) => patch({ label: e.target.value }));
  document.getElementById('docButtonTarget').addEventListener('change', (e) => patch({ target: e.target.value.trim() }));
}

function forgeDocRenderRowProps(panel, el) {
  const a = el.attributes;
  panel.innerHTML = `
    ${forgeDocPropsHeader('rangée')}
    <div class="docFieldRow"><label for="docRowGap">Espacement (px)</label><input type="number" id="docRowGap" value="${a.gap}" style="width:90px;"></div>
    <div class="docField">
      <span class="docFieldLabel">Alignement</span>
      <div class="docSegmented" id="docRowAlign">
        ${['stretch', 'flex-start', 'center', 'flex-end'].map((v) => `<button type="button" class="docSegBtn ${a.align === v ? 'is-active' : ''}" data-align="${v}">${v}</button>`).join('')}
      </div>
    </div>
    <div class="docField">
      <span class="docFieldLabel">Justification</span>
      <div class="docSegmented" id="docRowJustify">
        ${['flex-start', 'center', 'flex-end', 'space-between'].map((v) => `<button type="button" class="docSegBtn ${a.justify === v ? 'is-active' : ''}" data-justify="${v}">${v}</button>`).join('')}
      </div>
    </div>
    ${forgeDocDeleteButtonHtml()}
  `;
  function patch(partial) { forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }); }
  document.getElementById('docRowGap').addEventListener('change', (e) => patch({ gap: Number(e.target.value) }));
  panel.querySelectorAll('#docRowAlign .docSegBtn').forEach((btn) => btn.addEventListener('click', () => patch({ align: btn.dataset.align })));
  panel.querySelectorAll('#docRowJustify .docSegBtn').forEach((btn) => btn.addEventListener('click', () => patch({ justify: btn.dataset.justify })));
}

function forgeDocRenderMinigameProps(panel, el) {
  const a = el.attributes;
  const label = window.FORGE_DOCUMENT.elementKindLabels[el.kind] || el.kind;
  panel.innerHTML = `
    ${forgeDocPropsHeader(label)}
    <div class="docFieldRow"><span class="docFieldLabel">Type</span><span style="font-size:13px;font-weight:700;">${label}</span></div>
    <div class="docField">
      <span class="docFieldLabel">Couleur du thème</span>
      <div class="docSwatches" id="docMinigameColor">
        ${['#ff5f2e', '#ffb020', 'var(--doc-muted)', 'var(--doc-text)'].map((c) => `<div class="docSwatch ${a.theme_color === c ? 'is-active' : ''}" data-color="${c}" style="background:${c};"></div>`).join('')}
      </div>
    </div>
    <div style="font-size:12.5px;color:var(--doc-muted);">Formulaire de contenu détaillé à venir pour ce type d'élément.</div>
    ${forgeDocDeleteButtonHtml()}
  `;
  panel.querySelectorAll('#docMinigameColor .docSwatch').forEach((sw) => {
    sw.addEventListener('click', () => forgeDocUpdateAttributes(el.id, { ...el.attributes, theme_color: sw.dataset.color }));
  });
}

function forgeDocQuizNewQuestion() {
  return {
    text: 'Nouvelle question', choices: ['Choix 1', 'Choix 2'], correct_index: 0, points: 10,
  };
}

function forgeDocRenderQuizQuestionHtml(q, qIndex) {
  const choicesHtml = q.choices.map((choice, cIndex) => `
    <div class="docQuizChoiceRow">
      <input type="radio"
             name="docQuizCorrect${qIndex}"
             class="docQuizCorrectRadio"
             data-question-index="${qIndex}"
             data-choice-index="${cIndex}"
             ${cIndex === q.correct_index ? 'checked' : ''}>
      <input type="text"
             class="docQuizChoiceInput"
             value="${choice}"
             placeholder="Choix ${cIndex + 1}"
             data-question-index="${qIndex}"
             data-choice-index="${cIndex}">
    </div>
  `).join('');
  return `
    <div class="docQuizQuestion" data-question-index="${qIndex}">
      <div class="docQuizQuestionHeader">
        <span class="docFieldLabel">Question ${qIndex + 1}</span>
        <button type="button" class="docQuizRemoveBtn" data-question-index="${qIndex}" title="Supprimer cette question">🗑</button>
      </div>
      <div class="docField">
        <textarea class="docQuizTextInput" rows="2" data-question-index="${qIndex}" placeholder="Texte de la question">${q.text}</textarea>
      </div>
      <div class="docFieldRow">
        <label>Nombre de choix</label>
        <input type="number" class="docQuizChoiceCountInput" min="2" max="4" value="${q.choices.length}" data-question-index="${qIndex}" style="width:60px;">
      </div>
      <div class="docQuizChoicesList">${choicesHtml}</div>
      <div class="docFieldRow">
        <label>Points</label>
        <input type="number" class="docQuizPointsInput" min="0" value="${q.points}" data-question-index="${qIndex}" style="width:70px;">
      </div>
    </div>
  `;
}

function forgeDocRenderQuizProps(panel, el) {
  const a = el.attributes;
  const questions = a.questions || [];

  function patch(partial) {
    forgeDocUpdateAttributes(el.id, { ...el.attributes, ...partial }).then(() => {
      forgeDocRenderProps(window.forgeDocState.elementsById[el.id]);
    });
  }

  panel.innerHTML = `
    ${forgeDocPropsHeader('quiz')}
    <div class="docFieldRow">
      <label class="docFieldLabel" for="docQuizTimerEnabled">Chronomètre</label>
      <input type="checkbox" id="docQuizTimerEnabled" ${a.timer_enabled ? 'checked' : ''}>
    </div>
    ${a.timer_enabled ? `
    <div class="docFieldRow">
      <label for="docQuizTimerSeconds">Secondes par question</label>
      <input type="number" id="docQuizTimerSeconds" min="5" max="300" value="${a.timer_seconds}" style="width:70px;">
    </div>` : ''}
    <div class="docField">
      <span class="docFieldLabel">Couleur du thème</span>
      <div class="docSwatches" id="docQuizColor">
        ${['#ff5f2e', '#ffb020', 'var(--doc-muted)', 'var(--doc-text)'].map((c) => `<div class="docSwatch ${a.theme_color === c ? 'is-active' : ''}" data-color="${c}" style="background:${c};"></div>`).join('')}
      </div>
    </div>
    <div class="docSectionLabel docQuizQuestionsLabel">Questions</div>
    <div id="docQuizQuestionsList">${questions.length ? questions.map(forgeDocRenderQuizQuestionHtml).join('') : '<div class="docEmptyState">Aucune question — ajoute la première ci-dessous.</div>'}</div>
    <button type="button" class="docBtnSecondary docQuizAddBtn" id="docQuizAddQuestion">+ Ajouter une question</button>
    ${forgeDocDeleteButtonHtml()}
  `;

  document.getElementById('docQuizTimerEnabled').addEventListener('change', (e) => patch({ timer_enabled: e.target.checked }));
  const timerSecondsInput = document.getElementById('docQuizTimerSeconds');
  if (timerSecondsInput) timerSecondsInput.addEventListener('change', (e) => patch({ timer_seconds: Number(e.target.value) }));
  panel.querySelectorAll('#docQuizColor .docSwatch').forEach((sw) => {
    sw.addEventListener('click', () => patch({ theme_color: sw.dataset.color }));
  });

  document.getElementById('docQuizAddQuestion').addEventListener('click', () => {
    patch({ questions: [...questions, forgeDocQuizNewQuestion()] });
  });

  panel.querySelectorAll('.docQuizRemoveBtn').forEach((btn) => {
    btn.addEventListener('click', () => {
      const qIndex = Number(btn.dataset.questionIndex);
      patch({ questions: questions.filter((_, i) => i !== qIndex) });
    });
  });

  panel.querySelectorAll('.docQuizTextInput').forEach((input) => {
    input.addEventListener('change', (e) => {
      const qIndex = Number(input.dataset.questionIndex);
      patch({ questions: questions.map((q, i) => (i === qIndex ? { ...q, text: e.target.value } : q)) });
    });
  });

  panel.querySelectorAll('.docQuizChoiceCountInput').forEach((input) => {
    input.addEventListener('change', (e) => {
      const qIndex = Number(input.dataset.questionIndex);
      const count = Math.max(2, Math.min(4, Number(e.target.value) || 2));
      patch({
        questions: questions.map((q, i) => {
          if (i !== qIndex) return q;
          const choices = q.choices.slice(0, count);
          while (choices.length < count) choices.push(`Choix ${choices.length + 1}`);
          return { ...q, choices, correct_index: q.correct_index < count ? q.correct_index : 0 };
        }),
      });
    });
  });

  panel.querySelectorAll('.docQuizChoiceInput').forEach((input) => {
    input.addEventListener('change', (e) => {
      const qIndex = Number(input.dataset.questionIndex);
      const cIndex = Number(input.dataset.choiceIndex);
      patch({
        questions: questions.map((q, i) => (
          i === qIndex ? { ...q, choices: q.choices.map((c, ci) => (ci === cIndex ? e.target.value : c)) } : q
        )),
      });
    });
  });

  panel.querySelectorAll('.docQuizCorrectRadio').forEach((radio) => {
    radio.addEventListener('change', () => {
      const qIndex = Number(radio.dataset.questionIndex);
      const cIndex = Number(radio.dataset.choiceIndex);
      patch({ questions: questions.map((q, i) => (i === qIndex ? { ...q, correct_index: cIndex } : q)) });
    });
  });

  panel.querySelectorAll('.docQuizPointsInput').forEach((input) => {
    input.addEventListener('change', (e) => {
      const qIndex = Number(input.dataset.questionIndex);
      const points = Math.max(0, Number(e.target.value) || 0);
      patch({ questions: questions.map((q, i) => (i === qIndex ? { ...q, points } : q)) });
    });
  });
}

function forgeDocRenderProps(el) {
  const panel = document.getElementById('docPropsPanel');
  if (!el) {
    panel.innerHTML = '<div class="docSectionLabel">Propriétés</div><div class="docEmptyState">Sélectionnez un élément du document pour voir ses propriétés.</div>';
    return;
  }
  if (el.kind === 'titre' || el.kind === 'paragraphe') forgeDocRenderTextProps(panel, el);
  else if (forgeDocIsShapeKind(el.kind)) forgeDocRenderShapeProps(panel, el);
  else if (el.kind === 'image') forgeDocRenderImageProps(panel, el);
  else if (el.kind === 'bouton') forgeDocRenderButtonProps(panel, el);
  else if (el.kind === 'row') forgeDocRenderRowProps(panel, el);
  else if (el.kind === 'quiz') forgeDocRenderQuizProps(panel, el);
  else forgeDocRenderMinigameProps(panel, el);

  const deleteBtn = document.getElementById('docDeletePropBtn');
  if (deleteBtn) deleteBtn.addEventListener('click', () => forgeDocDeleteElement(el.id));
}

/* ---------------------------------------------------------------------
 * Chrome de l'éditeur : zoom, largeur d'aperçu responsive, Aperçu,
 * thème (scopé à .docEditor3), navigation mobile.
 * ------------------------------------------------------------------- */

function forgeDocBindZoom() {
  const docPage = document.getElementById('docPage');
  document.getElementById('docZoomOut').addEventListener('click', () => {
    window.forgeDocState.zoom = Math.max(50, window.forgeDocState.zoom - 10);
    document.getElementById('docZoomVal').textContent = `${window.forgeDocState.zoom}%`;
    docPage.style.transform = `scale(${window.forgeDocState.zoom / 100})`;
  });
  document.getElementById('docZoomIn').addEventListener('click', () => {
    window.forgeDocState.zoom = Math.min(150, window.forgeDocState.zoom + 10);
    document.getElementById('docZoomVal').textContent = `${window.forgeDocState.zoom}%`;
    docPage.style.transform = `scale(${window.forgeDocState.zoom / 100})`;
  });
}

function forgeDocBindWidthPicker() {
  document.querySelectorAll('.docWidthBtn').forEach((btn) => {
    btn.addEventListener('click', () => {
      document.querySelectorAll('.docWidthBtn').forEach((b) => b.classList.remove('is-active'));
      btn.classList.add('is-active');
      const docPage = document.getElementById('docPage');
      const width = btn.dataset.width;
      if (!width) {
        docPage.classList.remove('docPage--fixedWidth');
        docPage.style.removeProperty('--doc-preview-width');
      } else {
        docPage.classList.add('docPage--fixedWidth');
        docPage.style.setProperty('--doc-preview-width', `${width}px`);
      }
    });
  });
}

function forgeDocBindPreviewToggle() {
  document.getElementById('docPreviewBtn').addEventListener('click', () => {
    window.forgeDocState.previewMode = !window.forgeDocState.previewMode;
    document.getElementById('docEditor3').classList.toggle('docEditor3--preview', window.forgeDocState.previewMode);
  });
}

function forgeDocApplyTheme(theme) {
  const editor = document.getElementById('docEditor3');
  editor.dataset.theme = theme;
  const toggle = document.getElementById('docThemeToggle');
  toggle.innerHTML = theme === 'light'
    ? '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M20 14.5A8.5 8.5 0 1 1 9.5 4a7 7 0 0 0 10.5 10.5z"/></svg>'
    : '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.2 4.2l1.4 1.4M18.4 18.4l1.4 1.4M2 12h2M20 12h2M4.2 19.8l1.4-1.4M18.4 5.6l1.4-1.4"/></svg>';
}

function forgeDocBindThemeToggle() {
  let stored = 'dark';
  try {
    const saved = window.localStorage.getItem('forge-doc-editor-theme');
    if (saved === 'light' || saved === 'dark') stored = saved;
  } catch (e) { /* stockage indisponible, on reste sur le thème par défaut */ }
  forgeDocApplyTheme(stored);
  document.getElementById('docThemeToggle').addEventListener('click', () => {
    const next = document.getElementById('docEditor3').dataset.theme === 'light' ? 'dark' : 'light';
    forgeDocApplyTheme(next);
    try { window.localStorage.setItem('forge-doc-editor-theme', next); } catch (e) { /* ignore */ }
  });
}

function forgeDocBindMobileNav() {
  const left = document.getElementById('docSidebarLeft');
  const right = document.getElementById('docSidebarRight');
  document.querySelectorAll('#docBottomNav button').forEach((btn) => {
    btn.addEventListener('click', () => {
      forgeDocSetActiveBottomNav(btn.dataset.target);
      left.classList.toggle('is-open', btn.dataset.target === 'left');
      right.classList.toggle('is-open', btn.dataset.target === 'right');
    });
  });
  function closePanels() {
    left.classList.remove('is-open');
    right.classList.remove('is-open');
    forgeDocSetActiveBottomNav('doc');
  }
  document.getElementById('docCloseLeft').addEventListener('click', closePanels);
  document.getElementById('docCloseRight').addEventListener('click', closePanels);
}

function forgeDocBindDeselectOnBackgroundClick() {
  document.getElementById('docCanvasArea').addEventListener('click', (e) => {
    if (e.target.closest('[data-element-id]')) return;
    window.forgeDocState.selectedId = null;
    forgeDocApplySelectionClass();
    forgeDocRenderProps(null);
  });
}

function forgeDocBindKeyboardShortcuts() {
  document.addEventListener('keydown', (e) => {
    if (!document.getElementById('docEditor3')) return;
    const isUndo = (e.ctrlKey || e.metaKey) && !e.shiftKey && e.key.toLowerCase() === 'z';
    const isRedo = ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key.toLowerCase() === 'z')
      || ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'y');
    if (isUndo) { e.preventDefault(); forgeDocUndo(); }
    if (isRedo) { e.preventDefault(); forgeDocRedo(); }
  });
}

function forgeDocInit() {
  const root = document.getElementById('docEditor3');
  if (!root || !window.FORGE_DOCUMENT) return;

  window.forgeDocState = {
    slug: window.FORGE_DOCUMENT.slug,
    elements: window.FORGE_DOCUMENT.elements,
    elementsById: {},
    selectedId: null,
    undoStack: [],
    redoStack: [],
    previewMode: false,
    zoom: 100,
    shapeDrag: null,
  };
  forgeDocRebuildIndex();

  forgeDocBindCanvasInteractions();
  forgeDocBindLibraryDragHandlers();
  forgeDocBindCanvasDropZone();
  forgeDocBindShapeDragGlobalHandlers();
  forgeDocBindDeselectOnBackgroundClick();
  forgeDocBindZoom();
  forgeDocBindWidthPicker();
  forgeDocBindPreviewToggle();
  forgeDocBindThemeToggle();
  forgeDocBindMobileNav();
  forgeDocBindKeyboardShortcuts();
  forgeDocUpdateHistoryButtons();

  document.getElementById('docUndoBtn').addEventListener('click', forgeDocUndo);
  document.getElementById('docRedoBtn').addEventListener('click', forgeDocRedo);

  if (window.innerWidth <= 900) {
    document.getElementById('docSidebarLeft').classList.remove('is-open');
    document.getElementById('docSidebarRight').classList.remove('is-open');
  }
}

forgeDocInit();