/* ---- 图谱编辑模式（进入=快照基准；保存成功后基准刷新为已保存状态） ---- */
function snapshotGraph() {
  return { edges: JSON.parse(JSON.stringify(G.edges)), pos: JSON.parse(JSON.stringify(G.cardPos)),
    version: G.version, levels: Object.fromEntries(G.contacts.map(c => [c.id, c.level])) };
}
function paintGraphEditButtons() {
  $('btnGraphEdit').textContent = G.editing ? '退出编辑' : '编辑图谱';
  $('btnGraphSave').style.display = G.editing ? '' : 'none';
  $('btnGraphReset').style.display = G.editing ? '' : 'none';
  $('hintBar').classList.toggle('show', G.editing);
  wrap.classList.toggle('editing', G.editing);
}
function enterEdit() {
  G.editing = true;
  G.pendingAdds = []; G.pendingDeletes = []; G.cycleHighlight = null;
  G.editSnapshot = snapshotGraph();
  document.body.classList.add('graph-edit');
  paintGraphEditButtons();
  renderGraph(); renderGraphState();
  toast('已进入图谱编辑：拖卡片定级/改级，拖圆点连线，悬停连线删边');
}
function doExitEdit() {
  G.editing = false;
  G.pendingAdds = []; G.pendingDeletes = []; G.cycleHighlight = null;
  document.body.classList.remove('graph-edit');
  paintGraphEditButtons();
  hideBubble();
  renderGraph(); renderGraphState();
}
function restoreLevels() {
  const lv = (G.editSnapshot && G.editSnapshot.levels) || {};
  G.contacts.forEach(c => { if (c.id in lv) c.level = lv[c.id]; });
}
function discardGraphEdit() {
  if (G.editSnapshot) {
    G.edges = JSON.parse(JSON.stringify(G.editSnapshot.edges));
    G.cardPos = JSON.parse(JSON.stringify(G.editSnapshot.pos));
    G.version = G.editSnapshot.version;
    restoreLevels();
  }
  doExitEdit();
  toast('已放弃本次修改，恢复到进入编辑时的状态');
}
function graphEditToggle() { if (G.editing) exitEditAttempt(); else enterEdit(); }
function exitEditAttempt(after) {
  const dirty = G.pendingAdds.length || G.pendingDeletes.length;
  if (!dirty) { doExitEdit(); if (after) after(); return; }
  gUnsavedDlg({
    discard: () => { discardGraphEdit(); if (after) after(); },
    save: () => { saveGraph().then(ok => { if (ok) { doExitEdit(); if (after) after(); } }); }
  });
}
/* 全量快照 POST graph/save（版本 CAS）：nodes 全员等级终态（含未定级空值=撤级）+ 手动边终态集；
   公司边派生不入快照（D8）。67017 冲突 → 退出编辑态并重拉图谱（比原型更稳，原型保留编辑态易叠脏改）。 */
async function saveGraph() {
  const list = effectiveEdges();
  const cyc = findCycle(list);
  if (cyc) {
    G.cycleHighlight = cyc;
    renderGraph();
    toast('检测到循环关系(' + cyc.slice(0, -1).map(cname).join(' → ') + ')，已阻止保存，请修改环边（红色高亮）', 'err');
    return false;
  }
  const adds = G.pendingAdds.slice();
  const delEdges = G.edges.filter(e => G.pendingDeletes.includes(e.id));
  const nextEdges = G.edges.filter(e => !G.pendingDeletes.includes(e.id))
    .concat(adds.map(a => ({ id: a.parent + '>' + a.child, parent: a.parent, child: a.child })));
  const form = new URLSearchParams();
  form.set('customerId', D.id);
  form.set('version', String(G.version));
  G.contacts.forEach((c, i) => {
    form.set('nodes[' + i + '].contactId', c.id);
    form.set('nodes[' + i + '].level', c.level == null ? '' : String(c.level));
  });
  nextEdges.forEach((e, i) => {
    form.set('edges[' + i + '].parentId', e.parent);
    form.set('edges[' + i + '].childId', e.child);
  });
  try {
    const newVer = await api('/api/customer/contact/graph/save', { method: 'POST', body: form.toString() });
    G.version = Number(newVer) || G.version + 1;
    G.edges = nextEdges;
    adds.forEach(a => addLog('关系', '新增手动连线:' + cname(a.parent) + ' → ' + cname(a.child)));
    delEdges.forEach(e => addLog('关系', '删除连线:' + cname(e.parent) + ' → ' + cname(e.child) + '(手动边)'));
    G.pendingAdds = []; G.pendingDeletes = []; G.cycleHighlight = null;
    G.editSnapshot = snapshotGraph();
    toast('保存成功（版本 ' + G.version + '），已记录关系变更日志', 'ok');
    renderContactsList(); renderGraph(); renderGraphState();
    return true;
  } catch (err) {
    toast('保存失败(' + err.code + '):' + err.message + (err.code === 67017 ? '，版本已被他人推进，已退出编辑并重拉图谱' : ''), 'err');
    if (err.code === 67017) { doExitEdit(); loadGraph().then(() => { layoutGraph(); renderContactsList(); renderGraph(); renderGraphState(); }); }
    return false;
  }
}
function resetGraphEdit() {
  const dirty = G.pendingAdds.length || G.pendingDeletes.length;
  const doReset = () => {
    if (G.editSnapshot) {
      G.edges = JSON.parse(JSON.stringify(G.editSnapshot.edges));
      G.cardPos = JSON.parse(JSON.stringify(G.editSnapshot.pos));
      G.version = G.editSnapshot.version;
      restoreLevels();
    }
    G.pendingAdds = []; G.pendingDeletes = []; G.cycleHighlight = null;
    toast('已重置：恢复到进入编辑时的初始状态');
    renderGraph(); renderGraphState();
  };
  if (dirty) gConfirm('重置', '确定重置图谱布局吗？所有未保存的调整将恢复到初始状态。', doReset);
  else doReset();
}