// talktree.js — Conversation tree editor with unified condition & action
// editors powered by intereditor.js. Tree navigation, messages, and options
// (text / goto) stay here; condition and action editing delegates to
// intereditor via talk-scoped contexts that target talk.nodes[key]... paths.

(function() {
  'use strict';

  // ---- Path helpers ----

  function talkRoot() { return window._talkData && window._talkData.talk; }
  function talkNodes() { var r = talkRoot(); return r && r.nodes; }
  function talkSync() { if (typeof window.onTalkTreeChange === 'function') window.onTalkTreeChange(window._talkData); }

  function talkGet(path) {
    var parts = path.split('.'), obj = talkRoot();
    for (var i = 0; i < parts.length; i++) {
      if (obj == null) return undefined;
      var k = parts[i];
      obj = /^\d+$/.test(k) ? obj[parseInt(k, 10)] : obj[k];
    }
    return obj;
  }

  function talkSet(path, value) {
    var parts = path.split('.'), root = talkRoot();
    for (var i = 0; i < parts.length - 1; i++) {
      var k = parts[i];
      if (/^\d+$/.test(k)) {
        var idx = parseInt(k, 10);
        if (root[idx] == null) root[idx] = /^\d+$/.test(parts[i + 1]) ? [] : {};
        root = root[idx];
      } else {
        if (root[k] == null) root[k] = /^\d+$/.test(parts[i + 1]) ? [] : {};
        root = root[k];
      }
    }
    var lk = parts[parts.length - 1];
    if (/^\d+$/.test(lk)) { root[parseInt(lk, 10)] = value; }
    else { root[lk] = value; }
  }

  function talkDel(path) {
    var parts = path.split('.'), root = talkRoot();
    for (var i = 0; i < parts.length - 1; i++) {
      if (root == null) return;
      var k = parts[i];
      root = /^\d+$/.test(k) ? root[parseInt(k, 10)] : root[k];
    }
    if (!root) return;
    var lk = parts[parts.length - 1];
    if (/^\d+$/.test(lk)) { root.splice(parseInt(lk, 10), 1); }
    else { delete root[lk]; }
  }

  // ---- Talk scopes for intereditor.js ----
  // Each scope targets a specific condition or action object inside the talk
  // tree and handles re-render + talkSync on every mutation.

  // ---- Talk scopes for intereditor.js ----
  // Each scope targets a specific condition or action object inside the talk
  // tree and handles re-render + talkSync on every mutation.

  var _talkScopeSeq = 0;

  function talkCondScope(nodeKey, optIdx) {
    var token = 'tk' + (++_talkScopeSeq);
    return ie_registerScope({
      getCond: function() {
        var t = talkTarget(nodeKey, optIdx);
        return t && t.condition || null;
      },
      setCond: function(c) {
        var t = talkTarget(nodeKey, optIdx);
        if (!t) return;
        if (c) t.condition = c; else delete t.condition;
      },
      onChange: function() {
        talkSync();
        renderTalkTree(window._talkData);
      }
    }, token);
  }

  function talkActionScope(nodeKey, optIdx) {
    var token = 'tk' + (++_talkScopeSeq);
    return ie_registerScope({
      getStep: function() {
        var t = talkTarget(nodeKey, optIdx);
        return t && t.action || {};
      },
      setStep: function(s) {
        var t = talkTarget(nodeKey, optIdx);
        if (!t) return;
        if (s && Object.keys(s).length > 0) t.action = s; else delete t.action;
      },
      onChange: function() {
        talkSync();
        renderTalkTree(window._talkData);
      }
    }, token);
  }

  function talkTarget(nodeKey, optIdx) {
    var node = talkNodes() && talkNodes()[nodeKey];
    if (!node) return null;
    if (optIdx !== null) {
      if (!node.options || !node.options[optIdx]) return null;
      return node.options[optIdx];
    }
    return node;
  }

  // ---- Render a single action step for a talk node or option ----

  function talkRenderActionStep(nodeKey, optIdx) {
    var t = talkTarget(nodeKey, optIdx);
    var step = (t && t.action) || {};
    var scopeToken = talkActionScope(nodeKey, optIdx);
    var h = '<div class="ie-act-root" data-ie-scope="' + escAttr(scopeToken) + '">';
    h += ie_renderMessages(step, '', 0, 0, '');
    h += ie_renderAct(step, '', 0, 0, '');
    h += '<div class="ie-act-addbar">' + ie_renderStepAddbar(step, '', 0, 0, '') + '</div>';
    h += '</div>';
    return h;
  }

  // ---- talk cond/act add/remove helpers (called from onclick data-action) ----

  function talkAddNodeCond(nodeKey) {
    var node = talkNodes() && talkNodes()[nodeKey];
    if (!node || (node.condition && typeof node.condition === 'object')) return;
    node.condition = {all_of: []};
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkRemoveNodeCond(nodeKey) {
    var node = talkNodes() && talkNodes()[nodeKey];
    if (!node) return;
    delete node.condition;
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkAddNodeAct(nodeKey) {
    var node = talkNodes() && talkNodes()[nodeKey];
    if (!node || (node.action && typeof node.action === 'object')) return;
    node.action = {};
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkRemoveNodeAct(nodeKey) {
    var node = talkNodes() && talkNodes()[nodeKey];
    if (!node) return;
    delete node.action;
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkAddOptionCond(nodeKey, optIdx) {
    var t = talkTarget(nodeKey, optIdx);
    if (!t || (t.condition && typeof t.condition === 'object')) return;
    t.condition = {all_of: []};
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkRemoveOptionCond(nodeKey, optIdx) {
    var t = talkTarget(nodeKey, optIdx);
    if (!t) return;
    delete t.condition;
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkAddOptionAct(nodeKey, optIdx) {
    var t = talkTarget(nodeKey, optIdx);
    if (!t || (t.action && typeof t.action === 'object')) return;
    t.action = {};
    renderTalkTree(window._talkData);
    talkSync();
  }

  function talkRemoveOptionAct(nodeKey, optIdx) {
    var t = talkTarget(nodeKey, optIdx);
    if (!t) return;
    delete t.action;
    renderTalkTree(window._talkData);
    talkSync();
  }

  // ---- Event delegation ----

  function talkEvent(e) {
    var el = e.target;
    var path = el.getAttribute('data-tp');
    if (!path) return;

    var tag = el.tagName;
    var type = el.type;

    if (tag === 'INPUT' || tag === 'TEXTAREA') {
      var val;
      if (type === 'checkbox') { val = el.checked; }
      else if (type === 'number') { var n = parseFloat(el.value); val = isNaN(n) ? '' : n; }
      else { val = el.value; }
      talkSyncPath(path, val);
      if (path.endsWith('.goto') && e.type === 'change') renderTalkTree(window._talkData);
    } else if (tag === 'SELECT') {
      talkSyncPath(path, el.value);
    }
  }

  function talkSyncPath(path, val) {
    talkSet(path, val);
    talkSync();
  }

  function talkHandleClick(e) {
    var el = e.target;
    var action = el.getAttribute('data-action');
    if (!action) return;

    var nodeKey = el.getAttribute('data-nk');
    var optIdx = el.getAttribute('data-oi');

    switch (action) {
      case 'delete-node':
        deleteNode(nodeKey);
        break;
      case 'add-option':
        addOption(nodeKey);
        break;
      case 'delete-option':
        deleteOption(nodeKey, parseInt(optIdx, 10));
        break;
      case 'add-node':
        addNode();
        break;
      case 'add-message':
        addMessageLine(nodeKey);
        break;
      case 'delete-message':
        deleteMessageLine(nodeKey, parseInt(optIdx, 10));
        break;
      case 'add-node-cond':
        talkAddNodeCond(nodeKey);
        break;
      case 'remove-node-cond':
        talkRemoveNodeCond(nodeKey);
        break;
      case 'add-node-act':
        talkAddNodeAct(nodeKey);
        break;
      case 'remove-node-act':
        talkRemoveNodeAct(nodeKey);
        break;
      case 'add-opt-cond':
        talkAddOptionCond(nodeKey, parseInt(optIdx, 10));
        break;
      case 'remove-opt-cond':
        talkRemoveOptionCond(nodeKey, parseInt(optIdx, 10));
        break;
      case 'add-opt-act':
        talkAddOptionAct(nodeKey, parseInt(optIdx, 10));
        break;
      case 'remove-opt-act':
        talkRemoveOptionAct(nodeKey, parseInt(optIdx, 10));
        break;
    }
  }

  // ---- Render entry point ----

  window.renderTalkTree = function(data) {
    var container = document.getElementById('talktree');
    if (!container) return;
    // Purge old talk scopes before re-rendering (new ones will be registered).
    if (window._ieScopes) {
      Object.keys(window._ieScopes).forEach(function(k) {
        if (k.indexOf('tk') === 0) delete window._ieScopes[k];
      });
    }
    _talkScopeSeq = 0;
    window._talkData = data;
    window._talkOpenNodes = window._talkOpenNodes || new Set();
    window._talkOpenNodes.add('start');
    if (!data || !data.talk || !data.talk.nodes) {
      container.innerHTML = '<p style="color:#888">No conversation tree defined.</p>';
      return;
    }
    var nodes = data.talk.nodes;
    var visited = {};
    var html = '<div class="talk-tree" id="talkTreeRoot">';
    html += '<datalist id="talkNodeKeys">';
    Object.keys(nodes).forEach(function(k) { html += '<option value="' + escAttr(k) + '">'; });
    html += '</datalist>';
    html += renderTreeNodes(nodes, 'start', visited);

    var allKeys = Object.keys(nodes);
    var orphanKeys = [];
    for (var i = 0; i < allKeys.length; i++) {
      if (!visited[allKeys[i]]) orphanKeys.push(allKeys[i]);
    }
    if (orphanKeys.length > 0) {
      html += '<div class="talk-orphans">';
      html += '<div class="talk-orphans-label">Unreferenced Nodes</div>';
      html += '<div class="talk-orphans-hint">These nodes are not reachable from start. Add a goto to them from another node\'s option.</div>';
      for (var j = 0; j < orphanKeys.length; j++) {
        html += renderOrphanNode(orphanKeys[j], nodes[orphanKeys[j]], nodes);
      }
      html += '</div>';
    }

    html += renderAddNodeRow();
    html += '</div>';
    container.innerHTML = html;
    if (typeof DropView !== 'undefined') DropView.setupAllInter();
    if (typeof ced_setupSearchFields === 'function') {
      setTimeout(function() { ced_setupSearchFields(); }, 10);
    }
  };

  // ---- Add/Delete Node ----

  function renderAddNodeRow() {
    return '<div class="talk-add-node-row">' +
      '<input class="talk-input" id="talkNewNodeKey" placeholder="New node key (unique name)">' +
      '<button class="btn btn-sm talk-add-btn" data-action="add-node">Add Node</button>' +
      '</div>';
  }

  function addNode() {
    var input = document.getElementById('talkNewNodeKey');
    if (!input) return;
    var key = input.value.trim();
    if (!key) return;
    if (talkNodes()[key]) { notify('Node "' + key + '" already exists.', 'error'); return; }
    talkNodes()[key] = { messages: [], options: [] };
    input.value = '';
    renderTalkTree(window._talkData);
    talkSync();
  }

  function deleteNode(nodeKey) {
    if (nodeKey === 'start') { notify('Cannot delete the start node.', 'error'); return; }
    var nodes = talkNodes();
    if (!nodes || !nodes[nodeKey]) return;
    delete nodes[nodeKey];
    Object.keys(nodes).forEach(function(k) {
      var n = nodes[k];
      if (n.goto === nodeKey) delete n.goto;
      if (n.options) {
        n.options.forEach(function(opt) { if (opt.goto === nodeKey) opt.goto = ''; });
      }
    });
    renderTalkTree(window._talkData);
    talkSync();
  }

  // ---- Orphan node ----

  function renderOrphanNode(key, node, nodes) {
    var h = '<div class="talk-node">';
    h += '<div class="talk-node-header" onclick="if(!event.target.closest(\'[data-action]\'))talkToggleNode(\'' + escAttr(key) + '\',this.parentElement.parentElement)">';
    h += '<span class="talk-node-arrow"></span>';
    h += '<span class="talk-node-key">' + esc(key) + '</span>';
    h += '<span class="talk-node-preview">' + esc((getNodePreview(node) || '').substring(0, 60)) + '</span>';
    h += '<span class="talk-node-spacer"></span>';
    h += '<button class="btn btn-sm talk-node-btn talk-node-del" data-action="delete-node" data-nk="' + escAttr(key) + '">Remove</button>';
    h += '</div>';
    h += '<div class="talk-node-body">';
    h += renderNodeBody(key, node, nodes);
    h += '</div>';
    h += '</div>';
    return h;
  }

  // ---- Recursive tree render ----

  function renderTreeNodes(nodes, rootKey, seen, indent) {
    indent = indent || 0;
    var node = nodes[rootKey];
    if (!node) return '';
    if (seen[rootKey]) {
      return '<div class="talk-node ref"><span class="talk-node-key">' + esc(rootKey) + '</span> <a href="javascript:void(0)" onclick="document.getElementById(\'node-' + escAttr(rootKey) + '\').scrollIntoView({behavior:\'smooth\',block:\'center\'});return false" style="color:inherit;text-decoration:underline">(see above)</a></div>';
    }
    seen[rootKey] = true;

    var previewText = getNodePreview(node);
    var isOpen = window._talkOpenNodes.has(rootKey);

    var html = '<div class="talk-node' + (isOpen ? ' open' : '') + '" id="node-' + escAttr(rootKey) + '">';

    html += '<div class="talk-node-header" onclick="if(!event.target.closest(\'[data-action]\'))talkToggleNode(\'' + escAttr(rootKey) + '\',this.parentElement)">';
    html += '<span class="talk-node-arrow"></span>';
    html += '<span class="talk-node-key">' + esc(rootKey) + '</span>';
    html += '<span class="talk-node-preview">' + esc((previewText || '').substring(0, 60)) + '</span>';
    html += '<span class="talk-node-spacer"></span>';
    html += '<button class="btn btn-sm talk-node-btn talk-node-del" data-action="delete-node" data-nk="' + escAttr(rootKey) + '">Remove</button>';
    html += '</div>';

    html += '<div class="talk-node-body">';
    html += renderNodeBody(rootKey, node, nodes);
    html += '</div>';

    var childKeys = [];
    if (node.goto && nodes[node.goto]) childKeys.push(node.goto);
    if (node.options) {
      node.options.forEach(function(opt) {
        if (opt.goto && nodes[opt.goto] && childKeys.indexOf(opt.goto) < 0) childKeys.push(opt.goto);
      });
    }
    if (childKeys.length > 0) {
      html += '<div class="talk-children">';
      childKeys.forEach(function(k) { html += renderTreeNodes(nodes, k, seen, indent + 1); });
      html += '</div>';
    }

    html += '</div>';
    return html;
  }

  function getNodePreview(node) {
    if (node.messages && node.messages.length) return node.messages[0];
    return '';
  }

  // ---- Node body: condition, messages, options, action via intereditor ----

  window._talkOpenNodes = window._talkOpenNodes || new Set();

  function renderNodeBody(nodeKey, node, nodes) {
    var hasCond = !!(node.condition && typeof node.condition === 'object');
    var hasAct = !!(node.action && typeof node.action === 'object' && !Array.isArray(node.action));
    var hasOpts = node.options && node.options.length > 0;

    var html = '';

    // Node condition (via intereditor)
    if (hasCond) {
      html += '<div class="talk-cond-card cond">';
      html += '<div class="talk-cond-card-header">' +
        'Condition (for this node)' +
        '<button class="btn btn-sm talk-section-remove" data-action="remove-node-cond" data-nk="' + escAttr(nodeKey) + '">Remove</button>' +
        '</div>';
      html += '<div class="talk-cond-card-body">';
      html += ie_renderCond(node.condition, '', 0, '', '', {scopeToken: talkCondScope(nodeKey, null), alwaysOuterAddbar: true});
      html += '</div>';
      html += '</div>';
    } else {
      html += '<button class="btn btn-sm talk-add-cond-btn" data-action="add-node-cond" data-nk="' + escAttr(nodeKey) + '">+ Add Condition</button>';
    }

    // Node messages (unchanged)
    html += renderMessagesSection(nodeKey, node);

    // Node options
    html += renderOptionsSection(nodeKey, node);

    html += '<div class="talk-cond-card-sep"></div>';

    // Node action (via intereditor)
    if (hasAct) {
      html += '<div class="talk-cond-card act" style="margin-top:4px">';
      html += '<div class="talk-cond-card-header">' +
        'Action (at the start of this node)' +
        '<button class="btn btn-sm talk-section-remove" data-action="remove-node-act" data-nk="' + escAttr(nodeKey) + '">Remove</button></div>';
      html += '<div class="talk-cond-card-body">';
      html += talkRenderActionStep(nodeKey, null);
      html += '</div>';
      html += '</div>';
    } else {
      html += '<button class="btn btn-sm talk-add-act-btn" style="margin-top:4px" data-action="add-node-act" data-nk="' + escAttr(nodeKey) + '">+ Add Action</button>';
    }

    // Goto fallback
    if (hasCond) {
      html += '<div class="talk-cond-card-sep"></div>';
      html += renderGotoFallback(nodeKey, node, 'If condition fails, go to');
    } else if (!hasOpts) {
      html += renderGotoFallback(nodeKey, node, 'Auto-advance to');
    }

    return html;
  }

  // ---- Goto fallback ----

  function renderGotoFallback(nodeKey, node, label) {
    label = label || 'Auto-advance to';
    return '<div class="talk-goto-fallback">' +
      '<span class="talk-prop-label">' + esc(label) + '</span>' +
      '<input class="talk-input search-input" data-tp="nodes.' + escAttr(nodeKey) + '.goto" list="talkNodeKeys" value="' + escAttr(node.goto || '') + '" placeholder="Fallback node...">' +
      '</div>';
  }

  // ---- Messages section ----

  function renderMessagesSection(nodeKey, node) {
    var msgs = node.messages || [];
    var html = '<div class="talk-section">';
    html += '<div class="talk-section-header"><span class="talk-prop-label">Messages</span></div>';
    msgs.forEach(function(line, i) {
      html += '<div class="talk-seq-line">' +
        '<span class="talk-opt-arrow">&#10132;</span>' +
        '<input class="talk-input" data-tp="nodes.' + escAttr(nodeKey) + '.messages.' + i + '" value="' + escAttr(line) + '" placeholder="Message line...">' +
        '<button class="btn btn-sm talk-seq-del" data-action="delete-message" data-nk="' + escAttr(nodeKey) + '" data-oi="' + i + '">x</button>' +
        '</div>';
    });
    html += '<div class="talk-seq-add-row">' +
      '<span class="talk-opt-arrow">&#10132;</span>' +
      '<input class="talk-input" id="talkMsgAdd_' + escAttr(nodeKey) + '" placeholder="Add message line...">' +
      '<button class="btn btn-sm talk-add-btn" data-action="add-message" data-nk="' + escAttr(nodeKey) + '">Add</button>' +
      '</div>';
    html += '</div>';
    return html;
  }

  // ---- Options section ----

  function renderOptionsSection(nodeKey, node) {
    var options = node.options || [];
    var html = '<div class="talk-options">';
    html += '<span class="talk-options-label">Options</span>';

    if (options.length > 0) {
      options.forEach(function(opt, idx) {
        html += '<div class="talk-opt-edit-row">';
        html += '<span class="talk-seq-num">' + (idx + 1) + '</span>';
        html += '<input class="talk-input talk-opt-text" data-tp="nodes.' + escAttr(nodeKey) + '.options.' + idx + '.text" value="' + escAttr(opt.text || '') + '" placeholder="Option text...">';
        html += '<input class="talk-input talk-opt-goto search-input" data-tp="nodes.' + escAttr(nodeKey) + '.options.' + idx + '.goto" list="talkNodeKeys" value="' + escAttr(opt.goto || '') + '" placeholder="Goto...">';

        html += '<div class="talk-opt-edit-actions">';
        if (opt.condition && typeof opt.condition === 'object' && !Array.isArray(opt.condition)) {
          html += '<span class="talk-opt-tag talk-opt-tag-cond">cond</span>';
        } else {
          html += '<button class="btn btn-sm talk-add-cond-btn" style="margin:0;margin-bottom:0" data-action="add-opt-cond" data-nk="' + escAttr(nodeKey) + '" data-oi="' + idx + '" title="Add condition">cond</button>';
        }
        if (opt.action) {
          html += '<span class="talk-opt-tag talk-opt-tag-act">act</span>';
        } else {
          html += '<button class="btn btn-sm talk-add-act-btn" style="margin:0;margin-bottom:0" data-action="add-opt-act" data-nk="' + escAttr(nodeKey) + '" data-oi="' + idx + '" title="Add action">act</button>';
        }
        html += '</div>';

        html += '<button class="btn btn-sm talk-opt-del" data-action="delete-option" data-nk="' + escAttr(nodeKey) + '" data-oi="' + idx + '" title="Delete option">x</button>';
        html += '</div>';

        // Option condition detail
        if (opt.condition && typeof opt.condition === 'object' && !Array.isArray(opt.condition)) {
          html += '<div class="talk-opt-detail" style="display:block;margin-left:18px">';
          html += '<div class="talk-cond-card cond" style="margin-top:2px">';
          html += '<div class="talk-cond-card-header">Condition (for this option to show up)' +
            '<button class="btn btn-sm talk-section-remove" data-action="remove-opt-cond" data-nk="' + escAttr(nodeKey) + '" data-oi="' + idx + '">Remove</button></div>';
          html += '<div class="talk-cond-card-body">';
          html += ie_renderCond(opt.condition, '', 0, '', '', {scopeToken: talkCondScope(nodeKey, idx), alwaysOuterAddbar: true});
          html += '</div>';
          html += '</div>';
          html += '</div>';
        }

        // Option action detail
        if (opt.action) {
          html += '<div class="talk-opt-detail" style="display:block;margin-left:18px">';
          html += '<div class="talk-cond-card act" style="margin-top:2px">';
          html += '<div class="talk-cond-card-header">' +
            'Action (when this option is chosen)' +
            '<button class="btn btn-sm talk-section-remove" data-action="remove-opt-act" data-nk="' + escAttr(nodeKey) + '" data-oi="' + idx + '">Remove</button></div>';
          html += '<div class="talk-cond-card-body">';
          html += talkRenderActionStep(nodeKey, idx);
          html += '</div>';
          html += '</div>';
          html += '</div>';
        }
      });
    } else {
      html += '<div class="talk-option-empty">none</div>';
    }

    html += '<div class="talk-add-opt-row">' +
      '<span class="talk-seq-num" style="color:#555">' + (options.length + 1) + '</span>' +
      '<input class="talk-input talk-opt-text" id="talkOptText_' + escAttr(nodeKey) + '" placeholder="Option text...">' +
      '<input class="talk-input talk-opt-goto search-input" id="talkOptGoto_' + escAttr(nodeKey) + '" list="talkNodeKeys" placeholder="Goto...">' +
      '<span class="talk-opt-edit-actions" style="visibility:hidden;pointer-events:none">' +
        '<button class="btn btn-sm talk-add-cond-btn" style="margin:0">cond</button>' +
        '<button class="btn btn-sm talk-add-act-btn" style="margin:0">act</button>' +
      '</span>' +
      '<button class="btn btn-sm talk-add-btn" data-action="add-option" data-nk="' + escAttr(nodeKey) + '">Add</button>' +
      '</div>';

    html += '</div>';
    return html;
  }

  window.talkToggleNode = function(nodeKey, nodeEl) {
    var open = nodeEl.classList.toggle('open');
    if (open) {
      window._talkOpenNodes.add(nodeKey);
    } else {
      window._talkOpenNodes.delete(nodeKey);
    }
  };

  // ---- Add/Delete Option ----

  function addOption(nodeKey) {
    var textInput = document.getElementById('talkOptText_' + nodeKey);
    var gotoInput = document.getElementById('talkOptGoto_' + nodeKey);
    var text = textInput ? textInput.value.trim() : '';
    var dest = gotoInput ? gotoInput.value.trim() : '';
    var node = talkNodes()[nodeKey];
    if (!node) return;
    if (!node.options) node.options = [];
    node.options.push({ text: text, goto: dest });
    if (textInput) textInput.value = '';
    if (gotoInput) gotoInput.value = '';
    renderTalkTree(window._talkData);
    talkSync();
  }

  function deleteOption(nodeKey, idx) {
    var node = talkNodes()[nodeKey];
    if (!node || !node.options || idx < 0 || idx >= node.options.length) return;
    node.options.splice(idx, 1);
    renderTalkTree(window._talkData);
    talkSync();
  }

  // ---- Add/Delete Sequence Line ----

  function addMessageLine(nodeKey) {
    var input = document.getElementById('talkMsgAdd_' + nodeKey);
    var text = input ? input.value.trim() : '';
    var node = talkNodes()[nodeKey];
    if (!node) return;
    if (!node.messages) node.messages = [];
    node.messages.push(text);
    renderTalkTree(window._talkData);
    talkSync();
  }

  function deleteMessageLine(nodeKey, idx) {
    var node = talkNodes()[nodeKey];
    if (!node || !node.messages) return;
    node.messages.splice(idx, 1);
    if (node.messages.length === 0) delete node.messages;
    renderTalkTree(window._talkData);
    talkSync();
  }

  // ---- Global event listeners ----

  document.addEventListener('input', function(e) {
    var el = e.target;
    if (!el.closest || !el.closest('#talktree')) return;
    if (!el.getAttribute('data-tp')) return;
    talkEvent(e);
  });

  document.addEventListener('change', function(e) {
    var el = e.target;
    if (!el.closest || !el.closest('#talktree')) return;
    talkEvent(e);
  });

  document.addEventListener('click', function(e) {
    var el = e.target;
    if (!el.closest || !el.closest('#talktree')) return;
    talkHandleClick(e);
  });

  document.addEventListener('keydown', function(e) {
    if (e.key !== 'Enter') return;
    var el = e.target;
    if (!el.closest || !el.closest('#talktree')) return;

    if (el.id === 'talkNewNodeKey') {
      e.preventDefault();
      addNode();
      return;
    }

    if (el.id && (el.id.startsWith('talkOptText_') || el.id.startsWith('talkOptGoto_'))) {
      e.preventDefault();
      var nodeKey = el.id.replace('talkOptText_', '').replace('talkOptGoto_', '');
      addOption(nodeKey);
      return;
    }

    if (el.id && el.id.startsWith('talkMsgAdd_')) {
      e.preventDefault();
      var nk = el.id.replace('talkMsgAdd_', '');
      addMessageLine(nk);
      return;
    }
  });

})();