/* CST-Agent WebUI client: HTTP + SSE against the engine in the same binary.
 * No build step, no dependencies. The server renders Markdown to sanitized
 * HTML; this file lays out the conversation, the tool lines, the approval
 * gate and the anchored popovers. Protocol: docs/webui.md. */
'use strict';

/* --- token: from ?token= / #token=; the query parameter is appended to
 * every request so EventSource (which cannot set headers) works as well,
 * and a same-site cookie carries it for the <img> tags in rendered
 * Markdown. --- */
const TOKEN = (() => {
  const q = new URLSearchParams(location.search);
  if (q.get('token')) return q.get('token');
  return new URLSearchParams(location.hash.replace(/^#/, '')).get('token') || '';
})();
if (TOKEN) document.cookie = 'cst_token=' + encodeURIComponent(TOKEN) + '; path=/; SameSite=Strict';
const qs = (extra) => {
  const p = new URLSearchParams(extra || {});
  if (TOKEN) p.set('token', TOKEN);
  const s = p.toString();
  return s ? '?' + s : '';
};
function api(path, opt) {
  if (TOKEN) path += (path.includes('?') ? '&' : '?') + 'token=' + encodeURIComponent(TOKEN);
  return fetch(path, opt);
}
/* the server answers errors as {"error": "..."}; status and body ride along
 * so a caller can tell "needs a key" from "rejected key" */
class ApiError extends Error {
  constructor(msg, status, data) { super(msg); this.status = status; this.data = data || {}; }
}
async function readReply(r) {
  const text = await r.text();
  let data = null;
  try { data = text ? JSON.parse(text) : {}; } catch { data = null; }
  if (!r.ok) throw new ApiError(errorText(r.status, (data && data.error) || text || r.statusText), r.status, data);
  return data === null ? text : data;
}
async function getJSON(path) {
  return readReply(await api(path));
}
async function post(path, body, method) {
  const r = await api(path, {
    method: method || 'POST',
    headers: body === undefined ? {} : { 'Content-Type': 'application/json' },
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  return readReply(r);
}
/* engine messages that are still English, in the words the page uses */
const ERR_ZH = [
  [/^busy: wait for the running turn/, '正在运行，等这一轮结束再试'],
  [/^a turn is already running/, '已经有一轮在运行'],
  [/^another change is running/, '另一项修改正在进行，稍后再试'],
  [/^nothing to undo/, '没有可以撤销的写入'],
  [/^nothing to retry/, '没有可以重试的消息'],
  [/^cannot reset the rules/, '清除许可规则失败'],
  [/^expected a JSON object/, '请求格式不对'],
  [/^cannot set the title/, '标题保存失败'],
  [/^cannot delete the session/, '删除会话失败'],
  [/^cannot start a session/, '无法新建会话'],
  [/^no such session/, '找不到这个会话'],
  [/^no such permission request/, '这个许可请求已经结束'],
  [/^no such question/, '这个问题已经结束'],
  [/^unauthorized|^forbidden/i, '没有权限：请带上 token 打开页面'],
  [/^out of memory/, '服务器内存不足'],
  [/^path is required/, '需要填写路径'],
  [/^empty body/, '内容为空'],
  [/^no such skill/, '没有这个 skill（/skills 查看全部）'],
  [/^cannot save the settings/, '设置保存失败'],
  [/^nothing to compact/, '没有可以压缩的内容'],
  [/^compact llm: (.*)/, (m) => '压缩时模型请求失败：' + m[1]],
  [/^compact produced empty summary/, '压缩失败：模型给了空摘要'],
  [/^no such directory: (.*)/, (m) => '目录不存在：' + m[1]],
  [/^cannot use as a workspace: (.*)/, (m) => '不能用作工作目录：' + m[1]],
  [/^at most (\d+) images per message/, (m) => '每条消息最多 ' + m[1] + ' 张图'],
  [/^the images (?:already picked fill|together exceed) (\d+) MB/, (m) => '图片加起来超过 ' + m[1] + ' MB'],
  [/^HTTP (\d+): the API key was rejected/, (m) => 'API key 被拒绝（HTTP ' + m[1] + '）'],
  [/^not found$/, '服务端没有这个接口：页面和程序版本不一致，刷新页面试试'],
];
/* the first match of a [regexp, text | (match) => text] table, or null */
function zhOf(table, msg) {
  for (const [re, zh] of table) {
    const m = re.exec(msg);
    if (m) return typeof zh === 'function' ? zh(m) : zh;
  }
  return null;
}
function errorText(status, msg) {
  msg = String(msg || '');
  const zh = zhOf(ERR_ZH, msg);
  if (zh) return zh;
  if (status === 401 && !msg) return '没有权限：请带上 token 打开页面';
  return msg || ('HTTP ' + status);
}
/* the engine's one-line status messages */
const STATUS_ZH = [
  [/^calling model \(step (\d+)\)/, (m) => '调用模型 · 第 ' + m[1] + ' 步…'],
  [/^final answer pass/, '最后一次作答…'],
  [/^tool round done/, '工具执行完，继续…'],
  [/^contract error/, '模型的工具调用格式不对，让它重发…'],
  [/^empty response/, '模型回了空内容，重试…'],
  [/^output cut off/, '输出被截断，接着往下写…'],
  [/^the model refused images/, '模型不收图片，改发文字说明…'],
  [/^prompt (\d+)K tokens \(budget (\d+)K\)/, (m) => '上下文 ' + m[1] + 'K 超过预算 ' + m[2] + 'K，压缩中…'],
  [/^context compacted/, '上下文已压缩'],
  [/^done$/, '完成'],
  [/^blocked by the sandbox/, '被沙箱拦下'],
  [/^rerunning outside the sandbox/, '在沙箱外重跑…'],
  [/^unknown tool/, '模型调用了不存在的工具'],
  [/^skip repeated edit/, '跳过重复的修改'],
  [/^skip duplicate read/, '跳过重复的读取'],
  [/^running reads in parallel/, '并行读取中…'],
];
const statusText = (msg) => zhOf(STATUS_ZH, String(msg || '')) || msg;
/* why a turn stopped, in words: turn_end carries the engine's error text */
const HTTP_ZH = {
  400: '请求被拒绝', 401: 'API key 无效或已过期', 402: '余额不足', 403: '没有权限用这个模型',
  404: '模型或端点不存在', 408: '请求超时', 413: '请求太大', 429: '请求太频繁或额度用完',
};
const TURN_ERR_ZH = [
  [/^(?:llm: )?cancelled$/, '已停止'],
  [/^llm: http (\d+)(?::\s*([\s\S]*))?/i, (m) => '模型请求失败：' +
    (HTTP_ZH[m[1]] || (+m[1] >= 500 ? '服务端出错' : '出错')) + '（HTTP ' + m[1] + '）' + (m[2] ? '\n' + m[2] : '')],
  [/^llm: curl: (.*)/, (m) => '连不上模型服务：' + m[1]],
  [/^llm: api: (.*)/, (m) => '模型服务报错：' + m[1]],
  [/^llm: (.*)/, (m) => '模型请求失败：' + m[1]],
  [/^(\S+): repeated contract errors/, (m) => '模型连续几次没按 ' + m[1] +
    ' 协议的格式调用工具，这一轮停了。可以在运行设置里换个工具协议，或换个模型再试。'],
  [/^empty model response/, '模型返回了空内容。'],
  [/^step limit \((\d+)\) reached/, (m) => '这一轮用满了 ' + m[1] + ' 步上限。说"继续"接着做，或在运行设置里调大步数。'],
];
const turnError = (d) => zhOf(TURN_ERR_ZH, String(d.error || '')) || d.error ||
  ('这一轮没有完成（错误码 ' + d.rc + '）');
const errMsg = (e) => (e && e.message) || String(e);
let toastTimer = null;
function toast(msg, kind) {
  const t = document.getElementById('toast');
  if (!t) return;
  t.textContent = String(msg);
  t.className = 'toast ' + (kind || 'err');
  t.hidden = false;
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => { t.hidden = true; }, kind === 'ok' ? 2500 : 6000);
}
const toastErr = (e) => toast(errMsg(e), 'err');

const $ = (id) => document.getElementById(id);
const el = (tag, cls, text) => {
  const e = document.createElement(tag);
  if (cls) e.className = cls;
  if (text !== undefined) e.textContent = text;
  return e;
};
const attachURL = (rel) => 'api/attach/' + rel + qs();
const fmtSecs = (ms) => {
  const s = ms / 1000;
  if (s < 60) return s.toFixed(1) + ' 秒';
  const m = Math.floor(s / 60);
  return m + ' 分 ' + Math.round(s - m * 60) + ' 秒';
};
const num = (n) => (n || 0).toLocaleString();

const log = $('log');
const scroll = $('scroll');
let state = {};
let live = null;            /* streaming assistant block */
let proc = null;            /* the open process block: thinking + tool calls */
let stepIndex = new Map();  /* tool call id -> step row */
let lastTurn = null;        /* { session, ms }: the last turn's time, kept across the rebuild */
let pendingPreviews = [];   /* { src, name }: object URLs of the images uploaded from this page */
let shownPreviews = [];     /* the ones the newest prompt still shows until the rebuild */
let files = new Map();      /* this turn's file changes: path -> {add, del} */
let permReq = null;
let askReq = null;
let busy = false;
let turnStart = 0;
let turnErr = null;         /* why the last turn stopped; kept across reloads */
let detailsAll = localStorage.getItem('cst.details') === '1';  /* tool lines start open */
let shownThinking;          /* state.show_thinking last applied to the page */

/* --- anchored popovers ---------------------------------------------------
 * The pattern the reference apps use: a small sheet under the control that
 * owns the setting, each row = icon + title + one line, a check on the
 * current value. Shift+Tab and the arrow keys work, Escape closes. */

let popAnchor = null;
let popOpenedAt = 0;
/* icons all come from the sprite in index.html: one 24px grid, one stroke
 * weight, round caps. A mixed bag of unicode glyphs never reads as a family. */
const SVGNS = 'http://www.w3.org/2000/svg';
function icon(name, cls) {
  /* an unknown name is just an old text glyph: keep it, do not blank it out */
  if (!document.getElementById('i-' + name)) return el('span', cls || '', name);
  const s = document.createElementNS(SVGNS, 'svg');
  s.setAttribute('class', 'i' + (cls ? ' ' + cls : ''));
  const u = document.createElementNS(SVGNS, 'use');
  u.setAttribute('href', '#i-' + name);
  s.appendChild(u);
  return s;
}
function setIcon(btn, name) {
  const old = btn.querySelector('svg.i');
  if (old) old.replaceWith(icon(name));
}
function closePop() {
  const p = $('pop');
  p.hidden = true;
  p.textContent = '';
  popAnchor = null;
}
function popRow(o) {
  const b = el('button', 'pop-item' + (o.on ? ' on' : '') + (o.danger ? ' danger' : ''));
  b.appendChild(o.icon ? icon(o.icon, 'pi') : el('span', 'pi'));
  const m = el('span', 'pm');
  m.appendChild(el('span', 'pt', o.title));
  if (o.desc) m.appendChild(el('span', 'pd', o.desc));
  b.appendChild(m);
  if (o.on) b.appendChild(el('span', 'pk', '✓'));
  b.onclick = () => { const fn = o.onClick; closePop(); if (fn) fn(); };
  return b;
}
function positionPop(pop, anchor, align) {
  const a = anchor.getBoundingClientRect();
  pop.style.visibility = 'hidden';
  pop.style.left = '0px';
  pop.style.top = '0px';
  const p = pop.getBoundingClientRect();
  let left = align === 'right' ? a.right - p.width : a.left;
  left = Math.max(8, Math.min(left, window.innerWidth - p.width - 8));
  let top = a.bottom + 8;
  let origin = 'top';
  if (top + p.height > window.innerHeight - 8) {
    top = Math.max(8, a.top - p.height - 8);
    origin = 'bottom';
  }
  pop.style.left = left + 'px';
  pop.style.top = top + 'px';
  pop.style.transformOrigin = (align === 'right' ? '100%' : '0') + ' ' + (origin === 'bottom' ? '100%' : '0');
  pop.style.visibility = 'visible';
}
function openPop(anchor, build, opt) {
  const pop = $('pop');
  if (popAnchor === anchor) return closePop();   /* second tap closes */
  closePop();
  pop.textContent = '';
  build(pop, closePop);
  pop.hidden = false;
  positionPop(pop, anchor, (opt && opt.align) || 'left');
  popAnchor = anchor;
  popOpenedAt = Date.now();
}
document.addEventListener('click', (e) => {
  if ($('pop').hidden) return;
  /* the click lands on a child of the anchor button, so compare containers */
  if ($('pop').contains(e.target) || (popAnchor && popAnchor.contains(e.target))) return;
  closePop();
});
/* a phone browser fires resize while the address bar settles right after the
 * popover opened; that is not the user dismissing it */
window.addEventListener('resize', () => {
  if (Date.now() - popOpenedAt > 700) closePop();
});
window.addEventListener('keydown', (e) => {
  if (e.key === 'Escape' && !$('pop').hidden) closePop();
});

/* --- transcript ---------------------------------------------------------- */

function atBottom() {
  return scroll.scrollTop + scroll.clientHeight >= scroll.scrollHeight - 60;
}
function scrollDown(force) {
  if (force || atBottom()) scroll.scrollTop = scroll.scrollHeight;
  updateJump();
}
function updateJump() {
  $('to-bottom').hidden = atBottom();
}
function showEmpty(show) {
  $('empty').classList.toggle('gone', !show);
}
/* every row of the transcript shares one left edge, the composer's: no avatar
 * column, the assistant reads as plain text, only errors carry a mark */
function bubble(role, cls) {
  const m = el('div', 'msg ' + (cls || role));
  const b = el('div', 'body');
  m.appendChild(b);
  log.appendChild(m);
  showEmpty(false);
  scrollDown(true);
  return { root: m, body: b };
}
function actBtn(name, title, fn) {
  const b = el('button', 'act');
  b.title = title;
  b.setAttribute('aria-label', title);
  b.appendChild(icon(name));
  b.onclick = fn;
  return b;
}
function copyButton(text) {
  const b = actBtn('copy', '复制', async () => {
    try {
      await navigator.clipboard.writeText(text);
      setIcon(b, 'check');
      b.title = '已复制';
      setTimeout(() => { setIcon(b, 'copy'); b.title = '复制'; }, 1200);
    } catch { toast('浏览器不允许写剪贴板'); }
  });
  return b;
}
/* images sit above the prompt, outside the bubble: one keeps its shape, more
 * than one become a row of square tiles; a click opens the full picture */
function attachStrip(srcs) {
  const strip = el('div', 'attach-strip' + (srcs.length === 1 ? ' one' : ''));
  srcs.forEach((s, i) => {
    const b = el('button', 'thumb');
    b.title = s.name || '查看图片';
    const img = el('img');
    img.alt = s.name || 'image';
    img.loading = 'lazy';
    img.decoding = 'async';
    img.src = s.src;
    b.appendChild(img);
    b.onclick = () => openLightbox(srcs, i);
    strip.appendChild(b);
  });
  return strip;
}
function userBubble(text, srcs) {
  const b = bubble('user');
  b.body.textContent = text;
  if (srcs && srcs.length) b.root.insertBefore(attachStrip(srcs), b.body);
  b.root.dataset.prompt = '1';
  actionsFor(b.root, text);
  return b;
}
function actionsFor(root, text) {
  const row = el('div', 'msg-actions');
  row.appendChild(copyButton(text));
  root.appendChild(row);
  return row;
}

/* --- lightbox ------------------------------------------------------------ */

let lb = null;   /* { srcs, i } while a picture is open */
function showLightbox() {
  const s = lb.srcs[lb.i];
  $('lb-img').src = s.src;
  $('lb-img').alt = s.name || '';
  const many = lb.srcs.length > 1;
  $('lb-count').textContent = many ? (lb.i + 1) + ' / ' + lb.srcs.length : '';
  $('lb-prev').hidden = !many;
  $('lb-next').hidden = !many;
}
function openLightbox(srcs, i) {
  lb = { srcs: srcs.slice(), i };
  showLightbox();
  $('lightbox').hidden = false;
}
function closeLightbox() {
  $('lightbox').hidden = true;
  $('lb-img').removeAttribute('src');
  lb = null;
}
function stepLightbox(d) {
  if (!lb || lb.srcs.length < 2) return;
  lb.i = (lb.i + d + lb.srcs.length) % lb.srcs.length;
  showLightbox();
}

/* --- process timeline -----------------------------------------------------
 * Consecutive thinking and tool calls share one block that folds to a single
 * line; visible text (or a note, or the next prompt) closes it. History and
 * the live stream follow the same rule, so a reload draws what streamed. */

function procLabel(p) {
  const parts = [];
  if (p.thinks) parts.push(p.thinks > 1 ? '思考 ' + p.thinks + ' 次' : '已思考');
  if (p.tools) parts.push('工具 ' + p.tools + ' 次');
  const counts = parts.join(' · ');
  if (p.root.classList.contains('run')) {
    p.lbl.textContent = p.act || '处理中…';
    p.meta.textContent = counts;
  } else {
    p.lbl.textContent = counts || '过程';
    p.meta.textContent = '';
  }
}
function ensureProc() {
  if (proc) return proc;
  if (live && live.html) sealLive();
  const d = el('details', 'proc');
  d.open = !!state.show_thinking;
  const s = el('summary', 'proc-sum');
  s.appendChild(icon('chevron', 'proc-chev'));
  const lbl = el('span', 'proc-lbl');
  const meta = el('span', 'proc-meta');
  s.appendChild(lbl);
  s.appendChild(meta);
  const box = el('div', 'tl');
  d.appendChild(s);
  d.appendChild(box);
  log.appendChild(d);
  showEmpty(false);
  proc = { root: d, lbl, meta, box, thinks: 0, tools: 0, cur: null, act: '' };
  procLabel(proc);
  return proc;
}
function sealProc() {
  if (!proc) return;
  proc.root.classList.remove('run');
  procLabel(proc);
  proc = null;
}
function procAct(p, text) {
  p.root.classList.add('run');
  p.act = text;
  procLabel(p);
}
function firstLine(s) {
  const l = String(s).split('\n').find((x) => x.trim()) || '';
  return l.trim().slice(0, 200);
}
function procThink(text, running) {
  const p = ensureProc();
  let t = p.cur && p.cur.kind === 'think' ? p.cur : null;
  if (!t) {
    const d = el('details', 'tl-item think');
    d.open = !!state.show_thinking;
    const s = el('summary');
    s.appendChild(el('span', 'tl-dot'));
    s.appendChild(el('span', 'tl-name', '思考'));
    const prev = el('span', 'tl-prev');
    s.appendChild(prev);
    const body = el('div', 'think-text');
    const node = document.createTextNode('');
    body.appendChild(node);
    d.appendChild(s);
    d.appendChild(body);
    p.box.appendChild(d);
    t = { kind: 'think', root: d, prev, node, hasLine: false };
    p.cur = t;
    p.thinks++;
  }
  t.node.appendData(text);
  /* the preview is the first line, so it stops changing once that is whole */
  if (!t.hasLine) {
    t.prev.textContent = firstLine(t.node.data);
    t.hasLine = /\S[^\n]*\n/.test(t.node.data);
  }
  if (running) procAct(p, '正在思考…');
  else procLabel(p);
  return t;
}
/* "[cst] Plan mode is now ON: ..." notes the engine adds to the history; the
 * model reads the English, the page shows one line per change */
const APPROVAL_ZH = { ask: '每次询问', auto: '自动', yolo: '完全放行' };
const NOTE_ZH = [
  [/^Plan mode is now ON/, '切到计划模式（只读）'],
  [/^Plan mode is now OFF/, '切回构建模式'],
  [/^Approval mode is now (\w+)/, (m) => '审批改为' + (APPROVAL_ZH[m[1]] || m[1])],
  [/^The git branch is now (.+?)\.?$/, (m) => 'git 分支变为 ' + m[1]],
  [/^Today's date is now (.+?)\.?$/, (m) => '日期变为 ' + m[1]],
  [/^The workspace's AGENTS\.md changed/, 'AGENTS.md 有改动，已重新读入'],
  [/^The workspace's AGENTS\.md was removed/, 'AGENTS.md 已删除'],
];
function noteLine(text) {
  const lines = String(text || '').split('\n').filter((l) => l.startsWith('[cst]'))
    .map((l) => l.replace(/^\[cst\]\s*/, ''));
  const shown = (lines.length ? lines : [String(text || '').split('\n')[0]])
    .map((l) => zhOf(NOTE_ZH, l) || l);
  const n = el('div', 'note-line', shown.join(' · '));
  n.title = String(text || '');
  sealProc();
  log.appendChild(n);
}
/* history: the stored calls become the same step lines a live turn draws,
 * and each result fills its line in */
function historyCall(c) {
  const st = stepFor({ id: c.id, name: c.name });
  const a = argsLine(c.args);
  if (a) st.args.textContent = a;
}
function historyResult(m) {
  const st = stepFor({ id: m.tool_call_id, name: m.tool_name });
  st.root.classList.remove('run');
  st.root.classList.add('done');
  st.bad = !!m.exit;
  st.root.classList.toggle('bad', st.bad);
  st.phase.textContent = st.bad ? '失败 exit=' + m.exit : '完成';
  st.body.textContent = '';
  if (st.args.textContent) st.body.appendChild(el('pre', 'step-args-full', st.args.textContent));
  const out = m.out !== undefined ? m.out : (m.content || '');
  if (out) st.body.appendChild(el('pre', 'step-out', out + (m.truncated ? '\n… (截断)' : '')));
}
function renderMessage(m) {
  if (m.role === 'system') return;
  if (m.note) return noteLine(m.content);
  if (m.role === 'tool' || m.tool_result) return historyResult(m);
  const isUser = m.role === 'user';
  const text = m.text !== undefined ? m.text : (m.content || '');
  if (isUser) {
    sealProc();
    stepIndex = new Map();
    const srcs = (m.attach || []).map((a) => ({ src: attachURL(a.rel), name: a.name }));
    userBubble(text, srcs);
    return;
  }
  if (m.reasoning) {
    procThink(m.reasoning, false);
    proc.cur = null;   /* the next round's thinking is its own entry */
  }
  if (text.trim()) {
    sealProc();
    const b = bubble('assistant');
    if (m.html) b.body.innerHTML = m.html;
    else b.body.textContent = text;
    actionsFor(b.root, text);
  }
  for (const c of m.calls || []) historyCall(c);
}
/* only the newest exchange can be redone: the server rewinds one turn */
function lastPromptActions() {
  const prompts = log.querySelectorAll('.msg[data-prompt]');
  const p = prompts[prompts.length - 1];
  if (!p) return;
  const row = p.querySelector('.msg-actions');
  if (row) row.appendChild(actBtn('edit', '编辑重发', () => editLast(p)));
  const answers = log.querySelectorAll('.msg.assistant');
  const a = answers[answers.length - 1];
  if (a && (p.compareDocumentPosition(a) & Node.DOCUMENT_POSITION_FOLLOWING)) {
    const r = a.querySelector('.msg-actions');
    if (r) r.appendChild(actBtn('retry', '重新生成', () => retry()));
  }
}

async function loadSession() {
  const data = await getJSON('api/session');
  log.textContent = '';
  stepIndex = new Map();
  files = new Map();
  renderFilesPanel();
  proc = null;
  live = null;
  for (const m of data.messages) renderMessage(m);
  sealProc();
  stepIndex = new Map();
  lastPromptActions();
  if (lastTurn && lastTurn.session === state.session && log.lastChild) turnMeta(lastTurn.ms);
  if (turnErr && turnErr.session === state.session) {
    if (turnErr.stopped) noteLine('已停止');
    else bubble('error').body.textContent = turnErr.text;
  }
  /* a rebuild is not new content: settle every entrance animation at once */
  if (log.getAnimations) {
    for (const a of log.getAnimations({ subtree: true })) {
      try { a.finish(); } catch { /* an infinite pulse cannot finish; it keeps running */ }
    }
  }
  showEmpty(log.children.length === 0);
  const last = [...(data.messages || [])].reverse().find((m) => m.role === 'user' && !m.note && !m.tool_result);
  document.title = (last && last.content ? last.content.slice(0, 40) + ' · ' : '') + 'CST-Agent';
  scrollDown(true);
  updateJump();
}

/* --- live blocks --------------------------------------------------------- */

/* text closes the process block above it; thinking or a tool call after the
 * text closes the answer, so the next words start a bubble below them */
function ensureLive() {
  if (live) return live;
  sealProc();
  const b = bubble('assistant');
  b.body.classList.add('live');
  const out = el('div', 'live-html');
  b.body.appendChild(out);
  live = { root: b.root, body: b.body, out, html: '' };
  return live;
}
function sealLive() {
  if (!live) return;
  live.body.classList.remove('live');
  live = null;
}
function phaseText(p) {
  return { open: '准备中', ready: '待执行', run: '执行中', progress: '进行中', done: '完成' }[p] || p || '';
}
function argsLine(args) {
  if (!args) return '';
  return Object.entries(args)
    .map(([k, v]) => (typeof v === 'string' ? v : JSON.stringify(v)))
    .join(' ');
}
/* one line per call, like "已执行 python · <<PY>": open it for the details */
function stepFor(ev) {
  let st = stepIndex.get(ev.id);
  if (st) return st;
  const p = ensureProc();
  const node = el('details', 'tl-item step-line run');
  node.open = detailsAll;
  const sum = el('summary');
  const name = el('span', 'name', ev.name || 'tool');
  const args = el('span', 'args');
  const phase = el('span', 'phase', '准备中');
  sum.appendChild(el('span', 'tl-dot'));
  sum.appendChild(name);
  sum.appendChild(args);
  sum.appendChild(phase);
  const body = el('div', 'step-body');
  node.appendChild(sum);
  node.appendChild(body);
  p.box.appendChild(node);
  st = { kind: 'tool', root: node, sum, name, args, phase, body, t0: Date.now(), bad: false, proc: p };
  stepIndex.set(ev.id, st);
  p.cur = st;
  p.tools++;
  procLabel(p);
  return st;
}

/* --- the run panel answers one question: which files moved, and by how many
 * lines. Everything else about a call stays in the transcript where it
 * happened, so the panel stays readable no matter how long a turn runs. */
function linesOf(s) {
  return (typeof s === 'string' && s !== '') ? s.split('\n').length : 0;
}
function patchStat(text) {
  let add = 0, del = 0;
  for (const ln of String(text).split('\n')) {
    if (ln.startsWith('+++') || ln.startsWith('---')) continue;
    if (ln.charAt(0) === '+') add++;
    else if (ln.charAt(0) === '-') del++;
  }
  return { add, del };
}
function statFromArgs(name, args) {
  const a = args || {}, n = String(name || '');
  const body = a.patch ?? a.diff ?? a.input;
  if (/patch|diff/i.test(n) && typeof body === 'string') return patchStat(body);
  if (/write|create/i.test(n) && typeof a.content === 'string')
    return { add: linesOf(a.content), del: 0 };
  if (/edit|replace|rename/i.test(n)) {
    const old = a.old_string ?? a.old ?? a.find ?? a.old_text;
    const nw = a.new_string ?? a.new ?? a.replace ?? a.new_text;
    if (typeof nw === 'string' || typeof old === 'string')
      return { add: linesOf(nw), del: linesOf(old) };
  }
  return null;
}
function noteFileChange(ev) {
  const st = statFromArgs(ev.name, ev.args);
  if (!st) return;
  const a = ev.args || {};
  const path = String(a.path || a.file_path || a.file || a.filename || '补丁');
  const cur = files.get(path) || { add: 0, del: 0 };
  cur.add += st.add;
  cur.del += st.del;
  files.set(path, cur);
  renderFilesPanel();
}
function renderFilesPanel() {
  const box = $('files-body');
  if (!box) return;
  box.textContent = '';
  box.className = '';
  if ($('files-count')) $('files-count').textContent = String(files.size);
  if (!files.size) {
    box.className = 'muted';
    box.textContent = '本轮还没有改动文件。';
    return;
  }
  for (const [p, v] of files) {
    const row = el('button', 'fstat');
    row.appendChild(icon('file', 'fimg'));
    const nm = el('span', 'p', p);
    row.title = '查看 ' + p + ' 的 diff';
    row.onclick = () => showDiff(p === '补丁' ? undefined : p);
    row.appendChild(nm);
    row.appendChild(el('span', 'a', '+' + v.add));
    row.appendChild(el('span', 'd', '−' + v.del));
    box.appendChild(row);
  }
}
/* --- the real diff: git status + git diff of the workspace --------------- */
function diffPre(text) {
  const pre = el('pre', 'diff');
  for (const ln of String(text).split('\n')) {
    let cls = '';
    if (/^(diff |index |\+\+\+ |--- |new file|deleted file|similarity|rename )/.test(ln)) cls = 'h';
    else if (ln.startsWith('@@')) cls = 'hunk';
    else if (ln.charAt(0) === '+') cls = 'add';
    else if (ln.charAt(0) === '-') cls = 'del';
    pre.appendChild(el('span', cls, ln + '\n'));
  }
  return pre;
}
const GIT_ST = { M: '修改', A: '新增', D: '删除', R: '重命名', C: '复制', U: '冲突', T: '类型', '?': '未跟踪', '!': '忽略' };
function gitLabel(code) {
  const c = (code || '').replace(/ /g, '').charAt(0);
  return GIT_ST[c] || code || '';
}
async function showDiff(path) {
  let d;
  try { d = await getJSON('api/diff' + (path ? '?path=' + encodeURIComponent(path) : '')); }
  catch (e) { return toast('读取 diff 失败：' + errMsg(e)); }
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, path ? 'diff · ' + path : '工作区改动'));
  const row = el('div', 'buttons');
  if (!d.git) {
    box.appendChild(el('p', 'muted', '这个工作区不是 git 仓库（或者没有装 git），看不到真实 diff；右栏的行数是按工具参数估算的。'));
  } else {
    const list = el('div', 'diff-files');
    const fileOf = (f) => f.path.includes(' -> ') ? f.path.split(' -> ').pop() : f.path;
    for (const f of d.files || []) {
      const b = el('button', 'diff-file' + (fileOf(f) === path ? ' on' : ''));
      b.appendChild(el('span', 'st', gitLabel(f.status)));
      b.appendChild(el('span', 'p', f.path));
      b.onclick = () => showDiff(fileOf(f));
      list.appendChild(b);
    }
    if (!(d.files || []).length) list.appendChild(el('div', 'muted tiny', '工作区是干净的，没有改动。'));
    box.appendChild(list);
    if (d.diff) box.appendChild(diffPre(d.diff));
    else if ((d.files || []).length) {
      const f = (d.files || []).find((x) => fileOf(x) === path);
      box.appendChild(el('p', 'muted tiny', f && f.status === '??'
        ? '未跟踪的新文件：git 还没有记录它，所以没有 diff。'
        : '没有未暂存的改动（已 git add 的改动不在这里显示）。'));
    }
    if (d.truncated) box.appendChild(el('p', 'warn-text tiny', 'diff 太长，只显示了前 512 KB。'));
    if (path) row.appendChild(Object.assign(el('button', null, '全部改动'), { onclick: () => showDiff() }));
    row.appendChild(Object.assign(el('button', null, '刷新'), { onclick: () => showDiff(path) }));
  }
  row.appendChild(Object.assign(el('button', null, '关闭'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box, true);
}

function onTool(ev) {
  const st = stepFor(ev);
  const a = argsLine(ev.args);
  if (a) st.args.textContent = a;
  if (ev.phase === 'progress' && ev.detail) {
    /* a sub-agent's latest steps: "explore · grep foo · read_file x" */
    if (!st.detail) {
      st.detail = el('span', 'step-detail');
      st.sum.insertBefore(st.detail, st.phase);
    }
    st.detail.textContent = ev.detail;
    $('status').textContent = ev.detail;
  } else if (ev.detail && !st.args.textContent) st.args.textContent = ev.detail;
  st.phase.textContent = phaseText(ev.phase);
  st.root.classList.toggle('run', ev.phase !== 'done');
  if (ev.phase === 'done') {
    st.root.classList.remove('run');
    st.root.classList.add('done');
    st.phase.textContent = '完成 · ' + ((Date.now() - st.t0) / 1000).toFixed(1) + 's';
  }
  if (st.proc === proc) {
    procAct(proc, ev.phase === 'done' ? '等待模型…'
      : (ev.phase === 'progress' && ev.detail ? ev.detail : '执行 ' + (ev.name || '工具') + '…'));
  }
  scrollDown(false);
}
function onToolResult(ev) {
  const st = stepFor(ev);
  st.root.classList.remove('run');
  st.bad = !!ev.exit;
  st.root.classList.toggle('bad', st.bad);
  st.phase.textContent = st.bad ? ('失败 exit=' + ev.exit) : '完成';
  st.body.textContent = '';
  if (st.args.textContent) st.body.appendChild(el('pre', 'step-args-full', st.args.textContent));
  if (ev.out) st.body.appendChild(el('pre', 'step-out', ev.out + (ev.truncated ? '\n… (截断)' : '')));
  if (!st.bad) noteFileChange(ev);
  if (st.proc === proc) procAct(proc, '等待模型…');
  scrollDown(false);
}
function turnMeta(ms) {
  const wrap = el('div', 'turn-meta');
  const d = el('details');
  d.appendChild(el('summary', null, '用时 ' + fmtSecs(ms)));
  d.appendChild(el('div', 'muted tiny', '从发出去到最后一个工具结束；模型延迟和工具耗时都算在里面。'));
  wrap.appendChild(d);
  log.appendChild(wrap);
}

/* --- model checklist ----------------------------------------------------- */

function todoRows(text) {
  const rows = [];
  for (const raw of String(text || '').split('\n')) {
    let line = raw.replace(/\s+$/, '');
    if (!line.trim()) continue;
    let done = false, doing = false;
    line = line.replace(/^\s*[-*+]\s*/, '').replace(/^\s*\d+[.)]\s*/, '');
    if (/^\[[xX]\]/.test(line)) { done = true; line = line.replace(/^\[[xX]\]\s*/, ''); }
    else line = line.replace(/^\[( |>)\]\s*/, '');
    if (/^(✔|✅|\[done\])/i.test(line)) { done = true; line = line.replace(/^(✔|✅|\[done\])\s*/i, ''); }
    else if (/^(▶|➡|\[now\]|\[doing\])/i.test(line)) { doing = true; line = line.replace(/^(▶|➡|\[now\]|\[doing\])\s*/i, ''); }
    if (!line.trim()) continue;
    rows.push({ text: line, done, doing });
  }
  return rows;
}
function renderTodo(text) {
  const body = $('todo-body');
  body.textContent = '';
  const rows = todoRows(text);
  if (!rows.length) {
    body.className = 'muted';
    body.textContent = '模型还没有给出任务清单。';
    return;
  }
  body.className = '';
  const ul = el('ul', 'todo-list');
  for (const r of rows) {
    const li = el('li', r.done ? 'done' : r.doing ? 'doing' : '');
    li.appendChild(el('span', 'boxmark', r.done ? '☑' : r.doing ? '▣' : '☐'));
    li.appendChild(el('span', null, r.text));
    ul.appendChild(li);
  }
  body.appendChild(ul);
}

/* --- state --------------------------------------------------------------- */

const APPROVALS = [
  { key: 'ask', icon: 'shield', title: '每次询问', desc: '动文件或跑命令之前都要你点一下' },
  { key: 'auto', icon: 'bolt', title: '自动', desc: '直接执行，只有危险命令才问你' },
  { key: 'yolo', icon: 'alert', title: '完全放行', desc: '不再询问，风险自负' },
];
const EFFORTS = [
  { key: 'low', title: '低', desc: '最快，适合小改动' },
  { key: 'medium', title: '中', desc: '默认平衡' },
  { key: 'high', title: '高', desc: '多想一点，慢一些' },
  { key: 'max', title: '极高', desc: '最慢最贵，难题再用' },
];

function applyState(s) {
  state = Object.assign({}, state, s);
  const model = (s.provider ? s.provider + ' · ' : '') + (s.model || '-');
  $('chip-model').querySelector('.lbl').textContent = model;
  $('chip-model').title = model + (s.effort ? ' · 推理强度 ' + s.effort : '') +
    (s.key_set === false ? ' · 还没有 API key' : '');
  $('chip-model').classList.toggle('warn', s.key_set === false);
  const ap = $('chip-approval');
  const cur = APPROVALS.find((a) => a.key === (s.approval || 'auto'));
  ap.querySelector('.lbl').textContent = (cur ? cur.title : s.approval || 'auto');
  ap.classList.toggle('warn', s.approval === 'ask');
  ap.title = '审批权限：' + (cur ? cur.title : s.approval);
  for (const b of $('seg-mode').children)
    b.classList.toggle('on', (b.dataset.mode === 'plan') === !!s.plan_mode);
  $('foot-ws').textContent = s.workspace || 'workspace';
  $('foot-session').textContent = (s.session || '-').slice(0, 20);

  const u = s.usage || {};
  const money = (u.priced && u.cost) ? (u.currency || '') + u.cost.toFixed(4) : '';
  /* the panel carries two numbers only: what the context costs, and how much
   * of it the provider already had cached */
  const hit = Math.max(0, u.cached_tokens || 0);
  const miss = Math.max(0, u.cache_miss_tokens || 0);
  $('kv-ctx').textContent = num(s.context_tokens) + ' tok';
  $('kv-cache').textContent = (hit + miss) ? Math.round((hit / (hit + miss)) * 100) + '%' : '-';
  $('kv-cache').title = (hit + miss)
    ? num(hit) + ' 命中 / ' + num(miss) + ' 未命中' : '还没有缓存数据';
  $('cost').textContent = money;
  $('usage').textContent = u.requests ? `${u.requests} 往返 · ${num(u.prompt_tokens)}/${num(u.completion_tokens)} tok` : '';
  $('btn-undo').disabled = !s.undo_available;

  busy = !!s.status_busy;
  $('btn-stop').hidden = !busy;
  syncSend();
  if (!busy && !permReq) $('status').textContent = '就绪';

  renderPending();
  renderTodo(s.todo);
  if ('show_thinking' in s && s.show_thinking !== shownThinking) {
    shownThinking = s.show_thinking;
    for (const d of log.querySelectorAll('details.proc, details.tl-item.think')) d.open = !!s.show_thinking;
  }
}
const revokeAll = (list) => { for (const s of list) URL.revokeObjectURL(s.src); };
/* images waiting for the next prompt: thumbnails when this page uploaded all
 * of them, otherwise (another client, the CLI) the server's one-line notes */
let pendingSeen = 0;   /* the server's count last time: an upload's reply can beat its state event */
function renderPending() {
  const p = $('pending');
  const list = state.pending_images || [];
  const n = list.length;
  if (!n && pendingSeen && pendingPreviews.length) {
    revokeAll(pendingPreviews);
    pendingPreviews = [];
  }
  pendingSeen = n;
  p.hidden = !n;
  p.textContent = '';
  if (!n) return;
  const clear = () => post('api/attach', undefined, 'DELETE').catch(toastErr);
  const clearTitle = n > 1 ? '清空全部 ' + n + ' 张待发图片' : '移除这张图片';
  if (pendingPreviews.length === n) {
    pendingPreviews.forEach((s, i) => {
      const t = el('div', 'pend-thumb');
      const img = el('img');
      img.src = s.src;
      img.alt = s.name || 'image';
      img.title = list[i];
      img.onclick = () => openLightbox(pendingPreviews, i);
      const x = el('button', 'pend-x');
      x.title = clearTitle;
      x.setAttribute('aria-label', clearTitle);
      x.appendChild(icon('close'));
      x.onclick = clear;
      t.appendChild(img);
      t.appendChild(x);
      p.appendChild(t);
    });
  } else {
    for (const line of list) {
      const chip = el('span', 'chip');
      chip.appendChild(el('span', null, line));
      const x = el('button', 'icon tiny');
      x.appendChild(icon('close'));
      x.title = '清空待发图片';
      x.onclick = clear;
      chip.appendChild(x);
      p.appendChild(chip);
    }
  }
  if (state.sees_images === 0)
    p.appendChild(el('span', 'chip warn', (state.model || '当前模型') + ' 不识图：图片不会发给模型，换个识图模型再发'));
}

/* --- SSE ----------------------------------------------------------------- */

function connect() {
  const es = new EventSource('api/events' + qs());
  /* a turn can also start outside this page (the CLI, another client), so the
   * clock starts on the first sign of activity, not only on send() */
  const markBusy = () => { if (!turnStart) turnStart = Date.now(); };
  const on = (name, fn) => es.addEventListener(name, (e) => {
    try { fn(JSON.parse(e.data)); } catch (err) { console.error(name, err); }
  });
  on('state', applyState);
  on('status', (d) => { markBusy(); if (d.message) $('status').textContent = statusText(d.message); });
  on('assistant_html', (d) => {
    markBusy();
    const l = ensureLive();
    l.html += d.text || '';
    l.out.innerHTML = l.html;
    scrollDown(false);
  });
  on('think_delta', (d) => {
    markBusy();
    procThink(d.text || '', true);
    scrollDown(false);
  });
  on('tool', (ev) => { markBusy(); onTool(ev); });
  on('tool_result', onToolResult);
  on('todo', (d) => renderTodo(d.text));
  on('session', (d) => {
    closePop();
    live = null; proc = null; stepIndex = new Map();
    turnErr = null;
    lastTurn = null;
    loadSession().then(loadSessions).catch(toastErr);
    closeDrawers();
    if (d && d.id) $('status').textContent = '已切换会话';
  });
  on('permission', showGate);
  on('permission_done', hideGate);
  on('ask_user', showAsk);
  on('turn_end', (d) => {
    lastTurn = turnStart ? { session: state.session, ms: Date.now() - turnStart } : null;
    turnStart = 0;
    sealLive();
    sealProc();
    stepIndex = new Map();
    /* the reload below rebuilds the log, so the reason is drawn after it */
    turnErr = d && d.rc ? {
      text: turnError(d),
      stopped: /cancelled$/.test(d.error || ''),
      session: state.session,
    } : null;
    loadSession().then(() => {
      /* the rebuilt prompt shows the server's copies now */
      if (!lb || !lb.srcs.some((s) => shownPreviews.includes(s))) {
        revokeAll(shownPreviews);
        shownPreviews = [];
      }
    }).then(loadSessions).catch(toastErr);
  });
  /* the browser resumes from Last-Event-ID; a restarted server has none of
   * those events, so its state (and maybe session) is fetched afresh */
  let dropped = false;
  es.onerror = () => { dropped = true; $('status').textContent = '连接中断，重连中…'; };
  es.onopen = () => {
    if (!dropped) return;
    dropped = false;
    if (!busy) $('status').textContent = '就绪';
    const was = state.session;
    getJSON('api/state').then((s) => {
      applyState(s);
      if (s.session !== was) loadSession().then(loadSessions).catch(toastErr);
    }).catch(toastErr);
  };
}

/* --- approval gate ------------------------------------------------------- */

const GATE_KEYS = [
  { v: 1, label: '允许一次', key: '1', cls: 'ok' },
  { v: 2, label: '总是允许这个工具', key: '2', cls: '' },
  { v: 3, label: '总是允许这个前缀', key: '3', cls: '' },
  { v: 0, label: '拒绝', key: '4', cls: 'danger' },
];
let gateTimer = null;
function showGate(ev) {
  permReq = ev;
  $('gate').hidden = false;
  $('gate-title').textContent = ev.sandbox
    ? '沙箱拦下了这一步，要在沙箱外重跑吗？'
    : '允许 ' + (ev.tool || '工具') + ' 运行吗？';
  $('gate-detail').textContent = ev.preview || ev.detail || '';
  const row = $('gate-buttons');
  row.textContent = '';
  for (const a of GATE_KEYS) {
    const b = el('button', a.cls, a.label + '  (' + a.key + ')');
    b.onclick = () => answerGate(a.v);
    row.appendChild(b);
  }
  $('gate-keys').textContent = '焦点不在输入框时，按 y 允许一次，按 n 拒绝；超时未回答会被拒绝。';
  $('status').textContent = '等待你的许可…';
  let left = ev.timeout || state.perm_timeout || 600;
  clearInterval(gateTimer);
  const tick = () => {
    $('gate-timer').textContent = left >= 0 ? left + 's' : '';
    if (left-- <= 0) clearInterval(gateTimer);
  };
  tick();
  gateTimer = setInterval(tick, 1000);
  scrollDown(true);
}
function hideGate() {
  clearInterval(gateTimer);
  gateTimer = null;
  permReq = null;
  $('gate').hidden = true;
  $('gate-timer').textContent = '';
  if (!busy) $('status').textContent = '就绪';
}
async function answerGate(value) {
  if (!permReq) return;
  const id = permReq.id;
  hideGate();
  try {
    await post('api/permission', { id, answer: value });
    $('status').textContent = value ? '已允许，继续执行…' : '已拒绝';
  } catch (e) {
    toast('回答失败：' + errMsg(e));
  }
}
window.addEventListener('keydown', (e) => {
  if (lb) {
    if (e.key === 'Escape') { e.preventDefault(); closeLightbox(); }
    else if (e.key === 'ArrowLeft') { e.preventDefault(); stepLightbox(-1); }
    else if (e.key === 'ArrowRight') { e.preventDefault(); stepLightbox(1); }
    return;
  }
  /* typing "3" or "y" into the box must not grant a permission */
  const typing = e.isComposing || e.ctrlKey || e.metaKey || e.altKey ||
    (e.target && (e.target.isContentEditable || /^(INPUT|TEXTAREA|SELECT)$/.test(e.target.tagName)));
  if (permReq && !$('gate').hidden && !typing) {
    if (e.key === '1' || e.key.toLowerCase() === 'y') answerGate(1);
    else if (e.key === '2') answerGate(2);
    else if (e.key === '3') answerGate(3);
    else if (e.key === '4' || e.key.toLowerCase() === 'n') answerGate(0);
  }
  if (e.key === 'Escape') {
    if (!$('modal').hidden) return closeModal();
    if (!$('pop').hidden) return closePop();
    if (editing) return cancelEdit();
    if (busy) return void post('api/cancel', {}).catch(toastErr);
  }
  if (e.ctrlKey && e.key.toLowerCase() === 'b') { e.preventDefault(); toggleSide(); }
  if (e.ctrlKey && e.key.toLowerCase() === 'j') { e.preventDefault(); togglePanel(); }
  if (e.ctrlKey && e.key.toLowerCase() === 'k') { e.preventDefault(); showSessions(); }
  if ((e.ctrlKey || e.metaKey) && !e.shiftKey && !e.altKey && e.key.toLowerCase() === 'p') {
    e.preventDefault();
    showPalette();
  }
  if (e.key === 'F1' || (e.key === '?' && !typing)) { e.preventDefault(); showHelp(); }
  /* the composer handles its own Shift+Tab; a popover keeps it for focus */
  if (e.key === 'Tab' && e.shiftKey && !typing && $('modal').hidden && $('pop').hidden) {
    e.preventDefault();
    cycleApproval();
  }
});

/* --- modal sheet (session list) ------------------------------------------ */

function openModal(node, wide) {
  const box = $('modal-box');
  box.textContent = '';
  box.classList.toggle('wide', !!wide);
  box.appendChild(node);
  $('modal').hidden = false;
}
function closeModal() {
  $('modal').hidden = true;
  $('modal-box').textContent = '';
  askReq = null;
}
function showAsk(ev) {
  askReq = ev;
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, ev.question || '模型想确认一件事'));
  if (ev.detail && ev.detail !== ev.question) box.appendChild(el('pre', 'step-out', ev.detail));
  const send = (text, dismiss) => {
    post('api/ask_user', { id: ev.id, text, dismiss: !!dismiss }).catch(toastErr);
    closeModal();
  };
  const row = el('div', 'buttons');
  for (const opt of ev.options || [])
    row.appendChild(Object.assign(el('button', 'ok', opt), { onclick: () => send(opt, false) }));
  const free = el('input');
  free.placeholder = '自定义回答';
  row.appendChild(free);
  row.appendChild(Object.assign(el('button', 'ok', '回答'), { onclick: () => send(free.value, false) }));
  row.appendChild(Object.assign(el('button', 'danger', '忽略'), { onclick: () => send('', true) }));
  box.appendChild(row);
  openModal(box);
  setTimeout(() => free.focus(), 0);
}

/* --- sessions ------------------------------------------------------------ */

let sessionsCache = [];
function timeLabel(id) {
  const m = /^(\d{4})(\d{2})(\d{2})-(\d{2})(\d{2})/.exec(id || '');
  return m ? `${+m[2]}/${+m[3]} ${m[4]}:${m[5]}` : '';
}
let sessionsCurrent = '';
const sessMatch = (s, q) => !q || (s.title || '').toLowerCase().includes(q) || s.id.includes(q);
async function openSession(id) {
  if (id === (state.session || '')) return;
  await post('api/sessions/switch', { id });
  await loadSession();
  await loadSessions();
}
function renameSession(s) {
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '重命名会话'));
  box.appendChild(el('p', 'muted tiny', s.id));
  const input = el('input', 'key-input');
  input.value = s.title || '';
  input.placeholder = '留空则恢复为第一条消息';
  box.appendChild(input);
  const err = el('div', 'key-err');
  box.appendChild(err);
  const row = el('div', 'buttons');
  const go = async () => {
    try {
      await post('api/sessions/rename', { id: s.id, title: input.value.trim() });
      closeModal();
      loadSessions();
    } catch (e) { err.textContent = errMsg(e); }
  };
  input.addEventListener('keydown', (e) => { if (e.key === 'Enter') go(); });
  row.appendChild(Object.assign(el('button', 'ok', '保存'), { onclick: go }));
  row.appendChild(Object.assign(el('button', null, '取消'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box);
  setTimeout(() => { input.focus(); input.select(); }, 0);
}
function deleteSession(s) {
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '删除会话？'));
  box.appendChild(el('p', null, '「' + (s.title || s.id) + '」会被永久删除' +
    (s.id === state.session ? '；这是当前会话，删除后会开一个新的。' : '。')));
  const row = el('div', 'buttons');
  row.appendChild(Object.assign(el('button', 'danger', '删除'), {
    onclick: async () => {
      try {
        await post('api/sessions/delete', { id: s.id });
        closeModal();
        toast('已删除', 'ok');
        loadSessions();
      } catch (e) { closeModal(); toastErr(e); }
    },
  }));
  row.appendChild(Object.assign(el('button', null, '取消'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box);
}
function sessionMenu(anchor, s) {
  openPop(anchor, (pop) => {
    pop.appendChild(popRow({ icon: 'file', title: '重命名', onClick: () => renameSession(s) }));
    if (s.id === state.session)
      pop.appendChild(popRow({ icon: 'copy', title: '导出 Markdown', onClick: exportSession }));
    pop.appendChild(popRow({ icon: 'close', title: '删除', danger: true, onClick: () => deleteSession(s) }));
  }, { align: 'right' });
}
function renderSessionList() {
  const box = $('sessions-list');
  const q = ($('sess-search').value || '').trim().toLowerCase();
  box.textContent = '';
  const shown = sessionsCache.filter((s) => sessMatch(s, q)).slice(0, q ? 200 : 60);
  for (const s of shown) {
    const b = el('div', 'sess-item' + (s.id === sessionsCurrent ? ' on' : ''));
    b.tabIndex = 0;
    b.setAttribute('role', 'button');
    const t = el('span', 't');
    const ts = el('span', 'ts', s.title || '(空会话)');
    t.appendChild(ts);
    b.appendChild(t);
    b.appendChild(el('span', 'n', s.messages + ' 条 · ' + (timeLabel(s.id) || '')));
    const more = el('button', 'more');
    more.title = '更多';
    more.appendChild(icon('more'));
    more.onclick = (e) => { e.stopPropagation(); sessionMenu(more, s); };
    b.appendChild(more);
    b.title = s.id + ' · ' + s.messages + ' 条消息';
    const open = async () => {
      try { await openSession(s.id); closeDrawers(); } catch (e) { toastErr(e); }
    };
    b.onclick = open;
    b.onkeydown = (e) => { if (e.key === 'Enter' && e.target === b) open(); };
    b.oncontextmenu = (e) => { e.preventDefault(); sessionMenu(more, s); };
    box.appendChild(b);
  }
  if (!shown.length)
    box.appendChild(el('div', 'muted tiny', q ? '没有匹配的会话' : '还没有历史会话'));
  /* measure after layout: only rows whose title really overflows get the scroll */
  requestAnimationFrame(() => {
    for (const t of box.querySelectorAll('.t')) {
      const ts = t.firstChild;
      if (ts && ts.scrollWidth > t.clientWidth + 2) {
        t.classList.add('mq');
        t.style.setProperty('--mq', (ts.scrollWidth - t.clientWidth + 6) + 'px');
      }
    }
  });
}
async function loadSessions() {
  let data;
  try { data = await getJSON('api/sessions'); } catch (e) { toastErr(e); return; }
  sessionsCache = data.sessions || [];
  sessionsCurrent = data.current || '';
  renderSessionList();
}
async function showSessions() {
  await loadSessions();
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '会话'));
  const search = el('input', 'key-input');
  search.placeholder = '搜索标题或 ID';
  box.appendChild(search);
  const list = el('div', 'sess-list');
  box.appendChild(list);
  const draw = () => {
    list.textContent = '';
    const q = search.value.trim().toLowerCase();
    const shown = sessionsCache.filter((s) => sessMatch(s, q));
    for (const s of shown) {
      const row = el('div', 'sess');
      row.appendChild(el('span', 'id', (s.id === state.session ? '● ' : '  ') + s.id.slice(0, 12)));
      row.appendChild(el('span', 't', s.title || '(空会话)'));
      row.appendChild(el('span', 'id', s.messages + ' 条'));
      row.appendChild(Object.assign(el('button', null, '打开'), {
        onclick: async () => {
          try { closeModal(); await openSession(s.id); } catch (e) { toastErr(e); }
        },
      }));
      row.appendChild(Object.assign(el('button', null, '重命名'), { onclick: () => renameSession(s) }));
      row.appendChild(Object.assign(el('button', 'danger', '删除'), { onclick: () => deleteSession(s) }));
      list.appendChild(row);
    }
    if (!shown.length) list.appendChild(el('div', 'muted tiny', q ? '没有匹配的会话' : '还没有历史会话'));
  };
  search.addEventListener('input', draw);
  draw();
  const row = el('div', 'buttons');
  row.appendChild(Object.assign(el('button', 'ok', '新建会话'), {
    onclick: async () => {
      try {
        await post('api/sessions/new', {});
        closeModal();
        await loadSession();
        await loadSessions();
      } catch (e) { toastErr(e); }
    },
  }));
  row.appendChild(Object.assign(el('button', null, '关闭'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box);
  setTimeout(() => search.focus(), 0);
}

/* --- pickers as popovers ------------------------------------------------- */

/* "1M" / "200K" for a context window in tokens */
function fmtCtx(n) {
  if (!n) return '';
  if (n >= 1000000) return (n / 1000000).toFixed(n % 1000000 ? 1 : 0) + 'M';
  return Math.round(n / 1000) + 'K';
}
function modelDesc(m) {
  const parts = [];
  if (m.context) parts.push(fmtCtx(m.context) + ' 上下文');
  if (m.vision === true) parts.push('识图');
  else if (m.vision === false) parts.push('纯文本');
  if (m.reasoning) parts.push('推理强度');
  if (m.price) parts.push((m.price.currency || '') + m.price.miss + '/' + m.price.out + ' 每百万');
  parts.push(m.api ? '提供商列出' : '内置');
  return parts.join(' · ');
}
let modelsCache = null;   /* {provider, data} of the last GET api/models */
async function fetchModels(refresh) {
  const r = await api('api/models' + (refresh ? '?refresh=1' : ''));
  let d = null;
  try { d = await readReply(r); } catch (e) {
    /* 401 = the key was rejected: the body still has the built-in list */
    if (e.status !== 401) throw e;
    d = e.data || {};
  }
  modelsCache = { provider: d.provider, data: d };
  return d;
}
function setModel(id) {
  post('api/config', { model: id })
    .then(() => { toast('模型 → ' + id, 'ok'); })
    .catch(toastErr);
}
function modelPopover(anchor) {
  openPop(anchor, (pop) => {
    const head = el('div', 'pop-title pop-head');
    head.appendChild(el('span', null, '模型 · ' + (state.provider || '-')));
    const rb = el('button', 'icon tiny');
    rb.title = '从提供商重新拉取模型列表';
    rb.appendChild(icon('refresh'));
    head.appendChild(rb);
    pop.appendChild(head);
    const row = el('div', 'pop-input');
    const input = el('input');
    input.placeholder = '搜索，或直接输入模型名';
    input.spellcheck = false;
    row.appendChild(input);
    pop.appendChild(row);
    const note = el('div', 'pop-note');
    pop.appendChild(note);
    const list = el('div', 'pop-list');
    pop.appendChild(list);
    let data = (modelsCache && modelsCache.provider === state.provider) ? modelsCache.data : null;
    let loading = false;
    const pick = (id) => { closePop(); if (id && id !== state.model) setModel(id); };
    const render = () => {
      list.textContent = '';
      const q = input.value.trim();
      const ql = q.toLowerCase();
      const ms = (data && data.models) || [];
      const shown = ms.filter((m) => !ql || m.id.toLowerCase().includes(ql)).slice(0, 300);
      for (const m of shown)
        list.appendChild(popRow({ title: m.id, desc: modelDesc(m), on: m.id === state.model, onClick: () => pick(m.id) }));
      if (q && !ms.some((m) => m.id === q))
        list.appendChild(popRow({ icon: 'plus', title: '使用「' + q + '」', desc: '不在列表里也可以直接用', onClick: () => pick(q) }));
      if (!list.children.length)
        list.appendChild(el('div', 'pop-empty', loading ? '加载中…' : '没有匹配的模型'));
    };
    const setNote = () => {
      note.textContent = '';
      note.className = 'pop-note';
      if (loading) { note.textContent = '正在向 ' + (state.provider || '提供商') + ' 拉取模型列表…'; return; }
      if (!data) return;
      if (data.auth) {
        note.classList.add('bad');
        note.appendChild(el('span', null, data.error || 'API key 被拒绝'));
        const fix = el('button', 'link', '更换 key');
        fix.onclick = (e) => { e.stopPropagation(); closePop(); changeKey(); };
        note.appendChild(fix);
      } else if (data.api_error) {
        note.classList.add('warn');
        note.textContent = data.api_error + '；下面是内置列表';
      } else if (!data.key_set) {
        note.classList.add('warn');
        note.textContent = '还没有 API key，只能显示内置列表';
      } else if (data.api_count >= 0) {
        note.textContent = data.provider + ' 列出 ' + data.api_count + ' 个模型';
      }
    };
    const load = (refresh) => {
      loading = true; setNote(); render();
      fetchModels(refresh)
        .then((d) => { data = d; })
        .catch((e) => { data = data || { models: [] }; toastErr(e); })
        .finally(() => { loading = false; setNote(); render(); });
    };
    rb.onclick = (e) => { e.stopPropagation(); load(true); };
    input.addEventListener('input', render);
    input.addEventListener('keydown', (e) => {
      if (e.key !== 'Enter') return;
      const q = input.value.trim();
      const ms = (data && data.models) || [];
      const hit = ms.filter((m) => m.id.toLowerCase().includes(q.toLowerCase()));
      pick(hit.length === 1 ? hit[0].id : q);
    });
    if (data) { setNote(); render(); } else load(false);

    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(el('div', 'pop-title', '推理强度'));
    if (state.effort_applies === false)
      pop.appendChild(el('div', 'pop-note warn', '当前模型不接受推理强度参数：可以先选好，换到支持的模型时生效'));
    const LV = { low: 'lv1', medium: 'lv2', high: 'lv3', max: 'lv4' };
    for (const e2 of EFFORTS) {
      const r = popRow({
        icon: LV[e2.key] || 'lv1',
        title: e2.title,
        desc: e2.desc,
        on: e2.key === state.effort,
        onClick: () => post('api/config', { effort: e2.key })
          .then((d) => { if (d && d.warning) toast(d.warning, 'warn'); })
          .catch(toastErr),
      });
      if (state.effort_applies === false) r.classList.add('dim');
      pop.appendChild(r);
    }
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(popRow({
      icon: 'cpu',
      title: '提供商：' + (state.provider || '-'),
      desc: (state.api_base || '') + ' · 点这里切换',
      onClick: showProviders,
    }));
    setTimeout(() => input.focus(), 0);
  });
}

/* --- providers and keys -------------------------------------------------- */

function keyFromText(p) {
  if (!p.has_key) return '未设置 key';
  if (p.key_from === 'saved') return 'key 已保存';
  if (p.key_from === 'session') return 'key 仅本次运行';
  return 'key 来自环境变量 ' + p.key_from;
}
/* one password field; submit(key) returns a promise, a rejection stays in
 * the dialog so the user can paste another key */
function keyDialog(title, sub, submit) {
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, title));
  if (sub) box.appendChild(el('div', 'muted tiny', sub));
  box.appendChild(el('div', 'muted tiny', 'key 会先用 /models 验证，再保存到配置目录的 credentials 文件（仅你可读），不会出现在页面、日志或事件里。'));
  const input = el('input', 'key-input');
  input.type = 'password';
  input.autocomplete = 'off';
  input.placeholder = 'sk-…';
  box.appendChild(input);
  const err = el('div', 'key-err');
  box.appendChild(err);
  const row = el('div', 'buttons');
  const ok = el('button', 'ok', '验证并保存');
  const go = async () => {
    const k = input.value.trim();
    if (!k) { err.textContent = '请先粘贴 key'; return; }
    ok.disabled = true;
    err.textContent = '验证中…';
    try {
      await submit(k);
      input.value = '';
      closeModal();
    } catch (e) {
      err.textContent = errMsg(e);
      ok.disabled = false;
      input.select();
    }
  };
  ok.onclick = go;
  input.addEventListener('keydown', (e) => { if (e.key === 'Enter') go(); });
  row.appendChild(ok);
  row.appendChild(Object.assign(el('button', null, '取消'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box);
  setTimeout(() => input.focus(), 0);
}
function afterSwitch(r) {
  modelsCache = null;
  toast('已切换到 ' + r.provider + (r.model ? ' · ' + r.model : '（请选一个模型）'), 'ok');
  if (r.warning) setTimeout(() => toast(r.warning, 'warn'), 1200);
}
function askKeyFor(p) {
  keyDialog('API key · ' + p.name, p.api_base, async (key) => {
    afterSwitch(await post('api/provider', { name: p.name, key }));
  });
}
async function switchProvider(p) {
  if (!p.has_key) return askKeyFor(p);
  try {
    closeModal();
    afterSwitch(await post('api/provider', { name: p.name }));
  } catch (e) {
    if (e.data && e.data.need_key) return askKeyFor(p);
    toastErr(e);
  }
}
async function showProviders() {
  let d;
  try { d = await getJSON('api/providers'); } catch (e) { return toastErr(e); }
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '切换提供商'));
  for (const p of d.providers || []) {
    const row = el('div', 'prov' + (p.current ? ' on' : ''));
    const m = el('div', 'pm');
    m.appendChild(el('b', null, p.name + (p.current ? '  · 当前' : '')));
    m.appendChild(el('span', 'muted tiny', p.api_base));
    m.appendChild(el('span', 'tiny ' + (p.has_key ? 'ok-text' : 'warn-text'),
      keyFromText(p) + ' · ' + (p.model || '模型从 API 获取') + (p.source === 'user' ? ' · models.json' : '')));
    row.appendChild(m);
    const acts = el('div', 'prov-acts');
    if (p.current)
      acts.appendChild(Object.assign(el('button', null, '换 key'), { onclick: changeKey }));
    else
      acts.appendChild(Object.assign(el('button', 'ok', p.has_key ? '切换' : '设 key 并切换'), {
        onclick: () => switchProvider(p),
      }));
    row.appendChild(acts);
    box.appendChild(row);
  }
  const row = el('div', 'buttons');
  row.appendChild(Object.assign(el('button', null, '关闭'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box);
}
function changeKey() {
  keyDialog('更换 API key · ' + (state.provider || ''), state.api_base || '', async (key) => {
    const r = await post('api/key', { key });
    modelsCache = null;
    toast('key 已验证并保存', 'ok');
    if (r.warning) setTimeout(() => toast(r.warning, 'warn'), 1200);
  });
}
function approvalPopover(anchor) {
  openPop(anchor, (pop) => {
    pop.appendChild(el('div', 'pop-title', '审批权限'));
    for (const a of APPROVALS)
      pop.appendChild(popRow({
        icon: a.icon,
        title: a.title,
        desc: a.desc,
        on: a.key === (state.approval || 'auto'),
        danger: a.key === 'yolo',
        onClick: () => post('api/config', { approval: a.key }).catch(toastErr),
      }));
  }, { align: 'right' });
}
function plusPopover(anchor) {
  openPop(anchor, (pop) => {
    pop.appendChild(popRow({
      icon: 'image', title: '上传图片', desc: '也可以直接粘贴或拖进来',
      onClick: () => $('file').click(),
    }));
    pop.appendChild(popRow({
      icon: 'clipboard', title: '粘贴剪贴板', desc: '从剪贴板里取一张图',
      onClick: async () => {
        try {
          const items = await navigator.clipboard.read();
          for (const it of items) {
            const type = it.types.find((t) => t.startsWith('image/'));
            if (!type) continue;
            const blob = await it.getType(type);
            await upload(new File([blob], 'clipboard.png', { type }));
            return;
          }
          $('status').textContent = '剪贴板里没有图片';
        } catch { $('status').textContent = '浏览器不允许读剪贴板，请直接粘贴'; }
      },
    }));
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(popRow({
      icon: 'list', title: '计划模式', desc: '只读：先出方案，不改文件',
      on: !!state.plan_mode,
      onClick: () => post('api/config', { plan_mode: !state.plan_mode }).catch(toastErr),
    }));
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(el('div', 'pop-title', '工作目录'));
    const wrow = el('div', 'pop-input');
    const wpath = el('input');
    wpath.value = state.workspace || '';
    wpath.placeholder = '/绝对路径/到项目';
    wpath.spellcheck = false;
    const wgo = el('button', null, '切换');
    wgo.onclick = async () => {
      const p = wpath.value.trim();
      if (!p) return;
      wgo.disabled = true;
      try {
        await post('api/workspace', { path: p });
        closePop();
        await loadSession();
        await loadSessions();
        $('status').textContent = '工作目录已切换';
      } catch (e) {
        toastErr(e);
        wgo.disabled = false;
      }
    };
    wrow.appendChild(wpath);
    wrow.appendChild(wgo);
    pop.appendChild(wrow);
  });
}
function usagePopover(anchor) {
  const u = state.usage || {};
  openPop(anchor, (pop) => {
    pop.appendChild(el('div', 'pop-title', '状态'));
    const kv = (k, v) => {
      const row = el('div', 'kv');
      row.appendChild(el('span', null, k));
      row.appendChild(el('b', null, v));
      pop.appendChild(row);
    };
    kv('工作区', state.workspace || '-');
    kv('会话', state.session || '-');
    const mi = state.model_info || {};
    kv('上下文占用', num(state.context_tokens) + (mi.context ? ' / ' + fmtCtx(mi.context) : '') + ' tok');
    kv('模型往返', String(u.requests || 0));
    kv('Token', num(u.prompt_tokens) + ' / ' + num(u.completion_tokens));
    kv('费用', (u.priced && u.cost) ? (u.currency || '') + u.cost.toFixed(4) : (u.requests ? '未定价' : '-'));
    const t = state.turn_usage || {};
    if (t.requests)
      kv('上一轮', t.requests + ' 往返 · ' + num(t.prompt_tokens) + ' / ' + num(t.completion_tokens) +
        ((t.priced && t.cost) ? ' · ' + (t.currency || '') + t.cost.toFixed(4) : ''));
    kv('工具协议', state.protocol_tools || '-');
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(popRow({ icon: 'copy', title: '复制会话 ID', onClick: () => copyText(state.session || '') }));
    pop.appendChild(popRow({ icon: 'compress', title: '压缩上下文', desc: '把旧消息收成摘要', onClick: compact }));
  }, { align: 'right' });
}
function menuPopover(anchor) {
  openPop(anchor, (pop) => {
    pop.appendChild(popRow({ icon: 'list', title: '会话列表', desc: 'Ctrl+K', onClick: showSessions }));
    pop.appendChild(popRow({ icon: 'bolt', title: '命令面板', desc: 'Ctrl+P · 输入框里打 / 也行', onClick: showPalette }));
    pop.appendChild(popRow({ icon: 'cpu', title: '扩展', desc: 'MCP、插件、skills、子代理', onClick: () => showExtensions() }));
    pop.appendChild(popRow({ icon: 'copy', title: '复制会话 ID', onClick: () => copyText(state.session || '') }));
    pop.appendChild(popRow({ icon: 'refresh', title: '重新生成上一轮', desc: '删掉上一轮回答，用同一句话再问', onClick: () => retry() }));
    pop.appendChild(popRow({ icon: 'file', title: '导出 Markdown', desc: '下载当前会话', onClick: exportSession }));
    pop.appendChild(popRow({ icon: 'compress', title: '压缩上下文', onClick: compact }));
    pop.appendChild(popRow({
      icon: 'undo', title: '撤销上一次写入', desc: '把文件恢复到工具改写之前',
      onClick: undo,
    }));
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(popRow({
      icon: 'list', title: '思考过程默认展开', desc: '会记住，TUI 也用这个设置', on: !!state.show_thinking,
      onClick: () => setThinking(),
    }));
    pop.appendChild(popRow({
      icon: 'list', title: '展开全部工具输出', desc: '工具调用默认展开到参数和输出', on: detailsAll,
      onClick: () => setDetails(),
    }));
    pop.appendChild(popRow({ icon: 'moon', title: '切换主题', onClick: toggleTheme }));
    pop.appendChild(popRow({ icon: 'alert', title: '快捷键与命令', desc: 'F1', onClick: showHelp }));
    pop.appendChild(popRow({ icon: 'close', title: '退出服务', danger: true, onClick: () => post('api/quit', {}).then(() => toast('服务已退出', 'ok')).catch(toastErr) }));
  }, { align: 'right' });
}
function showSettings() {
  openPop($('btn-settings'), (pop) => {
    pop.appendChild(el('div', 'pop-title', '工作区'));
    const kv = (k, v) => {
      const row = el('div', 'kv');
      row.appendChild(el('span', null, k));
      row.appendChild(el('b', null, v || '-'));
      pop.appendChild(row);
    };
    kv('目录', state.workspace);
    kv('会话', state.session);
    kv('提供商', state.provider);
    kv('端点', state.api_base);
    kv('API key', keyFromText({ has_key: state.key_set, key_from: state.key_from }));
    kv('模型', state.model);
    kv('工具协议', state.protocol_tools);
    kv('工具集', state.tool_profile);
    kv('每轮最多步数', String(state.max_steps || '-'));
    pop.appendChild(el('div', 'pop-sep'));
    pop.appendChild(popRow({ icon: 'cpu', title: '模型与推理', onClick: () => modelPopover($('chip-model')) }));
    pop.appendChild(popRow({ icon: 'refresh', title: '切换提供商', desc: '换端点，需要时输入 key', onClick: showProviders }));
    pop.appendChild(popRow({ icon: 'shield', title: '更换 API key', desc: '验证后保存，只对当前提供商', onClick: changeKey }));
    pop.appendChild(popRow({ icon: 'shield', title: '审批权限', onClick: () => approvalPopover($('chip-approval')) }));
    pop.appendChild(popRow({ icon: 'settings', title: '运行设置…', desc: '工具协议、步数、工具开关、确认项、沙箱、已保存的许可', onClick: showRunSettings }));
    pop.appendChild(popRow({ icon: 'file', title: '工作区改动', desc: 'git status + diff', onClick: () => showDiff() }));
    pop.appendChild(popRow({ icon: 'cpu', title: '扩展…', desc: 'MCP、插件、skills、子代理；信任工作区', onClick: () => showExtensions() }));
    pop.appendChild(popRow({ icon: 'moon', title: '切换主题', onClick: toggleTheme }));
  });
}
const PERM_ZH = { read: '只读', write: '写文件', shell: '命令', net: '联网', ask: '提问', meta: '内部' };
async function showRunSettings() {
  let s, perms;
  try { [s, perms] = await Promise.all([getJSON('api/settings'), getJSON('api/permissions')]); }
  catch (e) { return toast('读取设置失败：' + errMsg(e)); }
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '运行设置'));
  box.appendChild(el('p', 'muted tiny', '只对这次运行生效，和 TUI 里的 /protocol、/tools、/max-steps 一样；有轮次在跑时不能改。'));
  const field = (label, input) => {
    const f = el('label', 'field');
    f.appendChild(el('span', null, label));
    f.appendChild(input);
    box.appendChild(f);
    return input;
  };
  const select = (opts, cur) => {
    const sel = el('select');
    for (const o of opts) sel.appendChild(Object.assign(el('option', null, o), { value: o, selected: o === cur }));
    return sel;
  };
  const proto = field('工具协议', select(s.protocols || [], s.protocol));
  const steps = field('每轮步数', Object.assign(el('input'), { type: 'number', min: 1, max: 1000, value: s.max_steps }));
  const prof = field('工具集', select(s.profiles || [], s.tool_profile));

  box.appendChild(el('h4', 'sub', '需要确认（审批模式 ' + (s.approval || '-') + '）'));
  const conf = {};
  const confRow = el('div', 'checks');
  for (const [k, label] of [['shell', '运行命令'], ['write', '改文件'], ['net', '联网']]) {
    const l = el('label', 'check');
    const cb = Object.assign(el('input'), { type: 'checkbox', checked: !!(s.confirm || {})[k] });
    conf[k] = cb;
    l.appendChild(cb);
    l.appendChild(el('span', null, label));
    confRow.appendChild(l);
  }
  box.appendChild(confRow);

  box.appendChild(el('h4', 'sub', '工具开关'));
  const toolBoxes = new Map();
  const tl = el('div', 'tool-list');
  for (const t of s.tools || []) {
    const l = el('label', 'tool-row' + (t.on ? '' : ' dim'));
    const cb = Object.assign(el('input'), { type: 'checkbox', checked: !t.off });
    toolBoxes.set(t.name, cb);
    l.appendChild(cb);
    l.appendChild(el('code', null, t.name));
    l.appendChild(el('span', 'perm', PERM_ZH[t.perm] || t.perm));
    const desc = el('span', 'desc', (t.owner ? '[' + t.owner + '] ' : '') + (t.desc || ''));
    desc.title = desc.textContent;
    l.appendChild(desc);
    tl.appendChild(l);
  }
  box.appendChild(tl);

  const sb = s.sandbox || {};
  box.appendChild(el('h4', 'sub', '命令沙箱'));
  box.appendChild(el('p', sb.active ? 'ok-text tiny' : 'warn-text tiny', sb.active
    ? '已启用：' + sb.kind + '（命令只能写工作区和临时目录）'
    : '不可用：按规则审批命令（' + (sb.kind || 'none') + '）'));
  if (sb.labels) box.appendChild(el('pre', 'step-out', sb.labels));

  box.appendChild(el('h4', 'sub', '已保存的"总是允许"'));
  const rules = el('div', 'tiny');
  const drawRules = (p) => {
    rules.textContent = '';
    const tools = p.tools || [], pre = p.shell_prefixes || [];
    rules.appendChild(el('div', null, '工具：' + (tools.length ? tools.join('、') : '（无）')));
    rules.appendChild(el('div', null, '命令前缀：' + (pre.length ? pre.map((x) => '`' + x + '`').join('、') : '（无）')));
    rules.appendChild(el('div', 'muted', '保存在 ' + (p.file || '.agent/permissions.json')));
  };
  drawRules(perms);
  box.appendChild(rules);
  const clear = Object.assign(el('button', 'link danger-text', '全部清除'), {
    onclick: async () => {
      try {
        await post('api/permissions', undefined, 'DELETE');
        drawRules(await getJSON('api/permissions'));
        toast('已清除保存的许可规则', 'ok');
      } catch (e) { toastErr(e); }
    },
  });
  box.appendChild(clear);

  const err = el('div', 'key-err');
  box.appendChild(err);
  const row = el('div', 'buttons');
  row.appendChild(Object.assign(el('button', 'ok', '保存'), {
    onclick: async () => {
      const body = {};
      if (proto.value !== s.protocol) body.protocol = proto.value;
      if (+steps.value !== s.max_steps) body.max_steps = +steps.value;
      if (prof.value !== s.tool_profile) body.tool_profile = prof.value;
      const c = {};
      for (const k of Object.keys(conf)) if (conf[k].checked !== !!(s.confirm || {})[k]) c[k] = conf[k].checked;
      if (Object.keys(c).length) body.confirm = c;
      const tools = {};
      for (const t of s.tools || []) {
        const on = toolBoxes.get(t.name).checked;
        if (on === !!t.off) tools[t.name] = on;
      }
      if (Object.keys(tools).length) body.tools = tools;
      if (!Object.keys(body).length) return closeModal();
      try {
        await post('api/settings', body);
        closeModal();
        toast('设置已更新', 'ok');
      } catch (e) { err.textContent = errMsg(e); }
    },
  }));
  row.appendChild(Object.assign(el('button', null, '取消'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box, true);
}
async function copyText(t) {
  try {
    await navigator.clipboard.writeText(t);
    $('status').textContent = '已复制：' + t;
  } catch { $('status').textContent = '复制失败'; }
}

/* --- composer ------------------------------------------------------------ */

function syncSend() {
  const v = $('input').value;
  /* commands also work while a turn runs (/stop, /help, …) */
  $('btn-send').disabled = (busy && !v.startsWith('/')) || !v.trim();
}
async function compact() {
  $('status').textContent = '压缩中…';
  try { await post('api/compact', {}); $('status').textContent = '上下文已压缩'; }
  catch (e) { $('status').textContent = '就绪'; toast('压缩失败：' + errMsg(e)); }
}
async function undo() {
  try { const t = await post('api/undo', {}); $('status').textContent = '已撤销：' + t; }
  catch (e) { toast('撤销失败：' + errMsg(e)); }
}
let editing = false;   /* the composer holds the last prompt, to replace it */
function setEditing(on) {
  editing = on;
  $('edit-bar').hidden = !on;
}
function cancelEdit() {
  setEditing(false);
  $('input').value = '';
  autoGrow();
  syncSend();
}
function editLast(node) {
  if (busy) return toast('等这一轮结束再编辑');
  const body = node.querySelector('.body');
  const input = $('input');
  input.value = body ? body.textContent : '';
  setEditing(true);
  autoGrow();
  syncSend();
  input.focus();
}
function freshTurn(text, srcs) {
  sealProc();
  sealLive();
  revokeAll(shownPreviews);
  shownPreviews = srcs || [];
  userBubble(text, shownPreviews);
  stepIndex = new Map();
  files = new Map();
  turnErr = null;
  lastTurn = null;
  renderFilesPanel();
  turnStart = Date.now();
}
/* drop the newest prompt and everything after it from the page, as the
 * server does with the session */
function cutLastTurn() {
  const prompts = log.querySelectorAll('.msg[data-prompt]');
  const p = prompts[prompts.length - 1];
  if (!p) return '';
  const body = p.querySelector('.body');
  const text = body ? body.textContent : '';
  while (p.nextSibling) p.nextSibling.remove();
  p.remove();
  return text;
}
/* the page is cut before the request: the new turn's events can arrive
 * before its reply does */
async function retry(text) {
  if (busy) return toast('等这一轮结束再重试');
  if (!log.querySelector('.msg[data-prompt]')) return toast('没有可以重试的消息');
  const old = cutLastTurn();
  freshTurn(text !== undefined ? text : old);
  try {
    await post('api/retry', text === undefined ? {} : { text });
    if (busy) $('status').textContent = text === undefined ? '重新生成中…' : '已重发…';
  } catch (e) {
    toast('重试失败：' + errMsg(e));
    turnStart = 0;
    loadSession().catch(toastErr);
  }
}
async function send(text) {
  const input = $('input');
  const raw = text !== undefined ? text : input.value;
  const body = raw.trim();
  if (!body) return;
  if (raw.startsWith('/') && !editing) {
    const r = runSlash(body);
    if (r === 'keep') return;
    if (r) {
      if (text === undefined) input.value = '';
      autoGrow();
      syncSend();
      return;
    }
  }
  if (busy) return;
  if (text === undefined) input.value = '';
  autoGrow();
  syncSend();
  if (editing) {
    setEditing(false);
    return retry(body);
  }
  /* the images go out with this prompt: draw them now from the local copies */
  const pend = (state.pending_images || []).length;
  let srcs = [];
  if (pend && pendingPreviews.length === pend) {
    srcs = pendingPreviews;
    pendingPreviews = [];
  }
  freshTurn(body, srcs);
  try {
    await post('api/turn', { text: body });
    if (busy) $('status').textContent = '已开始…';
  } catch (e) {
    if (srcs.length && !pendingPreviews.length && shownPreviews === srcs) {
      pendingPreviews = srcs;   /* still waiting on the server: keep the thumbnails */
      shownPreviews = [];
      renderPending();
    }
    bubble('error').body.textContent = errMsg(e);
  }
}
async function exportSession() {
  try {
    const r = await api('api/export');
    const md = await readReply(r);
    const a = el('a');
    a.href = URL.createObjectURL(new Blob([md], { type: 'text/markdown' }));
    a.download = (state.session || 'session') + '.md';
    document.body.appendChild(a);
    a.click();
    a.remove();
    setTimeout(() => URL.revokeObjectURL(a.href), 1000);
  } catch (e) { toast('导出失败：' + errMsg(e)); }
}
/* --- commands: "/name args" in the composer, Ctrl+P, F1 ------------------- */

async function newSession() {
  try { await post('api/sessions/new', {}); } catch (e) { return toastErr(e); }
  await loadSession();
  await loadSessions();
  closeDrawers();
}
function setComposer(text) {
  const input = $('input');
  input.value = text;
  autoGrow();
  syncSend();
  input.focus();
  input.setSelectionRange(text.length, text.length);
  slashSuggest();
}
function cycleApproval() {
  const keys = APPROVALS.map((a) => a.key);
  const next = keys[(keys.indexOf(state.approval || 'auto') + 1) % keys.length];
  setApproval(next);
}
function setApproval(a) {
  if (!a) return approvalPopover($('chip-approval'));
  const ap = APPROVALS.find((x) => x.key === a);
  if (!ap) return toast('审批模式只能是 ask / auto / yolo');
  post('api/config', { approval: a })
    .then(() => toast('审批：' + ap.title + ' · ' + ap.desc, a === 'yolo' ? 'warn' : 'ok'))
    .catch(toastErr);
}
function setEffort(a) {
  if (!a) return modelPopover($('chip-model'));
  if (!EFFORTS.some((x) => x.key === a)) return toast('推理强度只能是 low / medium / high / max');
  post('api/config', { effort: a })
    .then((r) => toast(r && r.warning ? r.warning : '推理强度 → ' + a, r && r.warning ? 'warn' : 'ok'))
    .catch(toastErr);
}
function setPlan(on) {
  post('api/config', { plan_mode: on })
    .then(() => toast(on ? '计划模式：只读，先出方案' : '构建模式：可以改文件', 'ok'))
    .catch(toastErr);
}
/* "on" / "off" / anything else flips */
const onOffArg = (a, cur) => (a === 'on' ? true : a === 'off' ? false : !cur);
function setThinking(a) {
  const on = onOffArg(a, !!state.show_thinking);
  post('api/config', { show_thinking: on })
    .then(() => toast(on ? '思考过程默认展开' : '思考过程默认收起', 'ok'))
    .catch(toastErr);
}
function setDetails(a) {
  detailsAll = onOffArg(a, detailsAll);
  localStorage.setItem('cst.details', detailsAll ? '1' : '0');
  for (const d of log.querySelectorAll('details.step-line')) d.open = detailsAll;
  toast(detailsAll ? '工具输出全部展开' : '工具输出全部收起', 'ok');
}
async function providerCmd(a) {
  if (!a) return showProviders();
  let d;
  try { d = await getJSON('api/providers'); } catch (e) { return toastErr(e); }
  const p = (d.providers || []).find((x) => x.name.toLowerCase() === a.toLowerCase());
  if (!p) return toast('没有叫 ' + a + ' 的提供商（/provider 打开列表）');
  switchProvider(p);
}
function renameCurrent(a) {
  if (a) {
    return post('api/sessions/rename', { title: a })
      .then(() => { toast('已重命名', 'ok'); loadSessions(); })
      .catch(toastErr);
  }
  renameSession(sessionsCache.find((s) => s.id === state.session) || { id: state.session || '', title: '' });
}
function editLastPrompt() {
  const ps = log.querySelectorAll('.msg[data-prompt]');
  if (!ps.length) return toast('还没有可以编辑的消息');
  editLast(ps[ps.length - 1]);
}
async function copyLastAnswer() {
  const as = log.querySelectorAll('.msg.assistant .body');
  if (!as.length) return toast('还没有回答');
  try {
    await navigator.clipboard.writeText(as[as.length - 1].innerText);
    toast('已复制最后一条回答', 'ok');
  } catch { toast('浏览器不允许写剪贴板'); }
}
/* /init and /skill: the server builds the prompt and starts the turn */
async function startCmdTurn(label, path, body) {
  if (busy) return toast('等这一轮结束再试');
  freshTurn(label);
  try {
    await post(path, body || {});
    if (busy) $('status').textContent = '已开始…';
  } catch (e) {
    toast(errMsg(e));
    turnStart = 0;
    loadSession().catch(toastErr);
  }
}
function runSkill(a) {
  if (!a) return showExtensions('skills');
  const name = a.split(/\s+/)[0];
  startCmdTurn('/skill ' + a, 'api/skill', { name, task: a.slice(name.length).trim() });
}

/* completions for the argument; null = none (or still loading) */
let extCache = null, providersCache = null, completing = false;
const fetched = new Set();   /* one try per source: a failed fetch is not retried per keystroke */
function fetchOnce(key, load) {
  if (completing || fetched.has(key)) return;
  fetched.add(key);
  completing = true;
  load().catch(() => {}).finally(() => { completing = false; slashSuggest(); });
}
const ON_OFF = () => [{ value: 'on', desc: '开' }, { value: 'off', desc: '关' }];
function completeSkill(arg) {
  if (/\s/.test(arg)) return null;
  if (!extCache) {
    fetchOnce('ext', async () => { try { extCache = await getJSON('api/extensions'); } catch { extCache = { skills: [] }; } });
    return null;
  }
  return (extCache.skills || []).map((s) => ({ value: s.name, desc: s.desc }));
}
function completeModel() {
  if (!modelsCache || modelsCache.provider !== state.provider) {
    fetchOnce('models:' + state.provider, () => fetchModels(false));
    return null;
  }
  return ((modelsCache.data || {}).models || []).map((m) => ({ value: m.id, desc: m.label || '' }));
}
function completeProvider() {
  if (!providersCache) {
    fetchOnce('providers', async () => {
      try { providersCache = (await getJSON('api/providers')).providers || []; } catch { providersCache = []; }
    });
    return null;
  }
  return providersCache.map((p) => ({ value: p.name, desc: p.api_base }));
}

const COMMANDS = [
  { name: 'help', aliases: ['keys'], desc: '快捷键和命令列表', key: 'F1', run: () => showHelp() },
  { name: 'new', aliases: ['clear'], desc: '新建会话', run: newSession },
  { name: 'sessions', desc: '会话列表：搜索、切换、重命名、删除', key: 'Ctrl+K', run: () => showSessions() },
  { name: 'rename', args: '[标题]', desc: '重命名当前会话（不带标题打开对话框）', run: renameCurrent },
  { name: 'retry', desc: '重新生成上一轮', run: () => retry() },
  { name: 'edit', desc: '编辑最后一句再发', run: editLastPrompt },
  { name: 'stop', desc: '停止当前一轮', key: 'Esc', run: () => post('api/cancel', {}).catch(toastErr) },
  { name: 'undo', desc: '撤销上一次写入', run: undo },
  { name: 'compact', desc: '把旧消息压成摘要，腾出上下文', run: compact },
  { name: 'export', desc: '下载当前会话的 Markdown', run: exportSession },
  { name: 'copy', desc: '复制最后一条回答', run: copyLastAnswer },
  { name: 'diff', args: '[文件]', desc: '工作区改动（git status + diff）', run: (a) => showDiff(a || undefined) },
  { name: 'model', args: '[模型]', desc: '换模型（不带参数打开列表）', complete: completeModel,
    run: (a) => (a ? setModel(a) : modelPopover($('chip-model'))) },
  { name: 'effort', args: '[low|medium|high|max]', desc: '推理强度',
    complete: () => EFFORTS.map((e) => ({ value: e.key, desc: e.title + ' · ' + e.desc })), run: setEffort },
  { name: 'provider', args: '[名字]', desc: '切换提供商（不带参数打开列表）', complete: completeProvider, run: providerCmd },
  { name: 'key', desc: '更换当前提供商的 API key', run: changeKey },
  { name: 'approval', args: '[ask|auto|yolo]', desc: '审批权限', key: 'Shift+Tab',
    complete: () => APPROVALS.map((a) => ({ value: a.key, desc: a.title + ' · ' + a.desc })), run: setApproval },
  { name: 'plan', desc: '计划模式：只读，先出方案', run: () => setPlan(true) },
  { name: 'build', desc: '构建模式：可以改文件', run: () => setPlan(false) },
  { name: 'settings', aliases: ['protocol', 'tools', 'max-steps', 'permissions'],
    desc: '运行设置：工具协议、步数、工具开关、确认项、沙箱、许可规则', run: () => showRunSettings() },
  { name: 'init', desc: '让 agent 分析仓库，写一份 AGENTS.md', run: () => startCmdTurn('/init', 'api/init') },
  { name: 'skill', args: '<名字> [任务]', desc: '带着某个 skill 开始一轮', complete: completeSkill, more: true, run: runSkill },
  { name: 'skills', desc: '查看可用的 skills', run: () => showExtensions('skills') },
  { name: 'extensions', aliases: ['mcp', 'plugins', 'agents'], desc: 'MCP、插件、skills、子代理；信任工作区',
    run: (a, name) => showExtensions(name === 'extensions' ? undefined : name) },
  { name: 'thinking', args: '[on|off]', desc: '思考过程默认展开/收起（会记住）', complete: ON_OFF, run: setThinking },
  { name: 'details', args: '[on|off]', desc: '工具输出全部展开/收起（会记住）', complete: ON_OFF, run: setDetails },
  { name: 'theme', desc: '切换深色/浅色', run: toggleTheme },
  { name: 'palette', desc: '命令面板', key: 'Ctrl+P', run: () => showPalette() },
];
const findCmd = (name) => COMMANDS.find((c) => c.name === name || (c.aliases || []).includes(name));
function invokeCmd(c, arg, name) {
  hideSlash();
  try {
    const r = c.run(arg || '', name || c.name);
    if (r && r.catch) r.catch(toastErr);
  } catch (e) { toastErr(e); }
}
/* true = ran it, 'keep' = an unknown command (left in the box), false = not
 * a command at all ("/usr/bin 是什么" goes to the model) */
function runSlash(line) {
  const m = /^\/([^\s/]+)(?:\s+([\s\S]*))?$/.exec(line);
  if (!m) return false;
  const name = m[1].toLowerCase();
  const c = findCmd(name);
  if (!c) {
    toast('没有 /' + m[1] + ' 这个命令。F1 看全部命令；想当普通消息发，开头加个空格。', 'warn');
    return 'keep';
  }
  invokeCmd(c, (m[2] || '').trim(), name);
  return true;
}

/* the list above the composer: command names, then argument values */
let slashItems = [], slashSel = 0;
function hideSlash() {
  $('slash').hidden = true;
  slashItems = [];
}
function slashSuggest() {
  const v = $('input').value;
  const m = /^\/([^\s/]*)(?: ([^\n]*))?$/.exec(v);
  if (!m) return hideSlash();
  const name = m[1].toLowerCase();
  let items;
  if (m[2] === undefined) {
    items = COMMANDS
      .filter((c) => c.name.startsWith(name) || (c.aliases || []).some((a) => a.startsWith(name)))
      .map((c) => ({ cmd: c, label: '/' + c.name, hint: c.args || '', desc: c.desc }));
  } else {
    const c = findCmd(name);
    const opts = c && c.complete ? c.complete(m[2]) : null;
    if (!opts) return hideSlash();
    const q = m[2].toLowerCase();
    items = opts
      .filter((o) => !q || o.value.toLowerCase().includes(q))
      .slice(0, 30)
      .map((o) => ({ cmd: c, value: o.value, label: o.value, hint: '', desc: o.desc || '' }));
  }
  const prev = slashItems[slashSel];
  slashItems = items;
  /* what was typed in full wins, then the row the arrows were on */
  const exact = m[2] === undefined
    ? items.findIndex((i) => i.cmd.name === name || (i.cmd.aliases || []).includes(name))
    : items.findIndex((i) => i.value === m[2]);
  const keep = prev ? items.findIndex((i) => i.label === prev.label) : -1;
  slashSel = exact >= 0 ? exact : keep >= 0 ? keep : 0;
  if (!items.length) return hideSlash();
  renderSlash();
}
function renderSlash() {
  const box = $('slash');
  box.textContent = '';
  slashItems.forEach((it, i) => {
    const b = el('button', 'slash-item' + (i === slashSel ? ' on' : ''));
    b.type = 'button';
    b.appendChild(el('code', null, it.label));
    if (it.hint) b.appendChild(el('span', 'hint', it.hint));
    b.appendChild(el('span', 'desc', it.desc));
    /* mousedown keeps the focus in the composer */
    b.onmousedown = (e) => { e.preventDefault(); slashSel = i; acceptSlash(it, true); };
    box.appendChild(b);
  });
  box.hidden = false;
  const on = box.children[slashSel];
  if (on) on.scrollIntoView({ block: 'nearest' });
}
/* Enter runs the pick, Tab only completes the text */
function acceptSlash(it, run) {
  if (!it) return;
  const c = it.cmd;
  if (it.value === undefined) {
    if (run && !(c.more && c.complete)) {
      $('input').value = '';
      autoGrow();
      syncSend();
      return invokeCmd(c, '');
    }
    return setComposer('/' + c.name + (c.args ? ' ' : ''));
  }
  const line = '/' + c.name + ' ' + it.value;
  if (run && !c.more) {
    $('input').value = '';
    autoGrow();
    syncSend();
    return invokeCmd(c, it.value);
  }
  setComposer(line + (c.more ? ' ' : ''));
  if (c.more) hideSlash();
}

function cmdLabel(c) {
  return '/' + c.name + (c.args ? ' ' + c.args : '');
}
function showPalette() {
  hideSlash();
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '命令面板'));
  const input = el('input', 'key-input');
  input.placeholder = '输入命令或说明过滤，↑↓ 选择，Enter 执行';
  input.spellcheck = false;
  box.appendChild(input);
  const list = el('div', 'palette-list');
  box.appendChild(list);
  let items = [], sel = 0;
  const pick = (c) => {
    closeModal();
    /* a required argument goes back to the composer to be filled in */
    if (c.args && c.args.startsWith('<')) return setComposer('/' + c.name + ' ');
    invokeCmd(c, '');
  };
  const render = () => {
    const q = input.value.trim().toLowerCase().replace(/^\//, '');
    items = COMMANDS.filter((c) => !q || c.name.includes(q) || c.desc.toLowerCase().includes(q) ||
      (c.aliases || []).some((a) => a.includes(q)));
    sel = Math.min(sel, Math.max(0, items.length - 1));
    list.textContent = '';
    items.forEach((c, i) => {
      const b = el('button', 'palette-item' + (i === sel ? ' on' : ''));
      b.appendChild(el('code', null, cmdLabel(c)));
      b.appendChild(el('span', 'desc', c.desc));
      if (c.key) b.appendChild(el('kbd', null, c.key));
      b.onclick = () => pick(c);
      list.appendChild(b);
    });
    if (!items.length) list.appendChild(el('div', 'muted tiny', '没有匹配的命令'));
    const on = list.children[sel];
    if (on && on.scrollIntoView) on.scrollIntoView({ block: 'nearest' });
  };
  input.addEventListener('input', () => { sel = 0; render(); });
  input.addEventListener('keydown', (e) => {
    const n = Math.max(1, items.length);
    if (e.key === 'ArrowDown') { e.preventDefault(); sel = (sel + 1) % n; render(); }
    else if (e.key === 'ArrowUp') { e.preventDefault(); sel = (sel + n - 1) % n; render(); }
    else if (e.key === 'Enter' && !e.isComposing) { e.preventDefault(); if (items[sel]) pick(items[sel]); }
  });
  openModal(box);
  render();
  setTimeout(() => input.focus(), 0);
}

const KEYS_HELP = [
  ['Enter', '发送'],
  ['Shift+Enter', '换行'],
  ['/', '输入命令：Tab 补全，↑↓ 选择，Enter 执行'],
  ['Ctrl+P', '命令面板'],
  ['Ctrl+K', '会话列表'],
  ['Shift+Tab', '切换审批：每次询问 → 自动 → 完全放行'],
  ['Esc', '关闭弹窗 / 取消编辑 / 停止当前一轮'],
  ['Ctrl+B · Ctrl+J', '收起或展开左栏 · 右栏'],
  ['y · n · 1-4', '回答许可请求（焦点不在输入框时）'],
  ['F1 · ?', '这个帮助'],
];
function showHelp() {
  hideSlash();
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '快捷键'));
  const keys = el('div', 'keys-grid');
  for (const [k, d] of KEYS_HELP) {
    keys.appendChild(el('kbd', null, k));
    keys.appendChild(el('span', null, d));
  }
  box.appendChild(keys);
  box.appendChild(el('h4', 'sub', '命令（在输入框里打，或者 Ctrl+P）'));
  const cmds = el('div', 'keys-grid cmds');
  for (const c of COMMANDS) {
    cmds.appendChild(el('code', null, cmdLabel(c)));
    cmds.appendChild(el('span', null, c.desc + ((c.aliases || []).length ? '（也可以 /' + c.aliases.join(' /') + '）' : '')));
  }
  box.appendChild(cmds);
  const row = el('div', 'buttons');
  row.appendChild(Object.assign(el('button', null, '关闭'), { onclick: closeModal }));
  box.appendChild(row);
  openModal(box, true);
}

/* --- extensions: MCP servers, plugins, skills, sub-agents ----------------- */

const MCP_ZH = { starting: '启动中', ready: '就绪', failed: '失败', exited: '已退出', off: '未启动' };
const RUN_ZH = { done: '完成', error: '出错', cancelled: '已取消', running: '运行中' };
function reportZh(r) {
  return String(r || '')
    .replace(/(\d+) skills?/, '$1 个 skill')
    .replace(/(\d+) plugins? \((\d+) tools?\)/, '$1 个插件（$2 个工具）')
    .replace(/(\d+) MCP servers?/, '$1 个 MCP 服务器')
    .replace(/untrusted workspace: \/plugins trust/, '工作区未信任，它自带的插件和 MCP 没有加载');
}
async function showExtensions(focus) {
  let d;
  try { d = extCache = await getJSON('api/extensions'); }
  catch (e) { return toast('读取扩展失败：' + errMsg(e)); }
  const box = document.createDocumentFragment();
  box.appendChild(el('h3', null, '扩展'));
  if (!d.enabled)
    box.appendChild(el('p', 'warn-text tiny', '当前工具集是 minimal：MCP、插件、skills 和子代理都不加载。在运行设置里换回 default，再点"重新加载"。'));
  box.appendChild(el('p', 'muted tiny', (d.report ? '已加载：' + reportZh(d.report) + '。' : '没有加载任何扩展。') +
    (d.trusted
      ? '这个工作区已信任：它的 .agent/plugins 和 .agent/mcp.json 会加载。'
      : '这个工作区未信任：它的 .agent/plugins 和 .agent/mcp.json 不会加载（配置目录里的照常加载）。')));
  const acts = el('div', 'buttons left');
  const act = async (path, body, done) => {
    try {
      const r = await post(path, body);
      toast(done + (r.report ? '：' + reportZh(r.report) : ''), 'ok');
      showExtensions(focus);
    } catch (e) { toastErr(e); }
  };
  acts.appendChild(Object.assign(el('button', null, '重新加载'), {
    title: '停掉 MCP 服务器和插件，重新读取（有轮次在跑时不行）',
    onclick: () => act('api/extensions/reload', {}, '已重新加载'),
  }));
  acts.appendChild(Object.assign(el('button', d.trusted ? 'danger' : 'ok', d.trusted ? '取消信任这个工作区' : '信任这个工作区'), {
    title: '信任后会运行工作区里 .agent/plugins 和 .agent/mcp.json 指定的程序',
    onclick: () => act('api/extensions/trust', { on: !d.trusted }, d.trusted ? '已取消信任' : '已信任'),
  }));
  box.appendChild(acts);

  const secs = {};
  const section = (key, title, rows, empty, draw) => {
    const h = el('h4', 'sub', title + ' · ' + rows.length);
    secs[key] = h;
    box.appendChild(h);
    const list = el('div', 'ext-list');
    if (!rows.length) list.appendChild(el('div', 'muted tiny', empty));
    for (const r of rows) list.appendChild(draw(r));
    box.appendChild(list);
  };
  const row = (name, badge, badgeCls, meta, sub, button) => {
    const r = el('div', 'ext-row');
    const m = el('div', 'pm');
    const t = el('div', 'ext-title');
    t.appendChild(el('b', null, name));
    if (badge) t.appendChild(el('span', 'ext-badge ' + (badgeCls || ''), badge));
    if (meta) t.appendChild(el('span', 'muted tiny', meta));
    m.appendChild(t);
    if (sub) m.appendChild(el('div', 'tiny ' + (badgeCls === 'bad' ? 'danger-text' : 'muted'), sub));
    r.appendChild(m);
    if (button) r.appendChild(button);
    return r;
  };
  const useBtn = (label, text) => Object.assign(el('button', null, label), {
    onclick: () => { closeModal(); setComposer(text); },
  });
  section('mcp', 'MCP 服务器', d.mcp || [],
    '没有 MCP 服务器。在配置目录的 mcp.json（或已信任工作区的 .agent/mcp.json）里写 {"mcpServers": {"名字": {"command": …, "args": […]}}}，再点重新加载。',
    (s) => row(s.name, MCP_ZH[s.state] || s.state,
      s.state === 'ready' ? 'ok' : s.state === 'failed' || s.state === 'exited' ? 'bad' : '',
      (s.state === 'ready' ? s.tools + ' 个工具（mcp__' + s.name + '__*）· ' : '') + s.source,
      s.error || s.command));
  section('plugins', '插件', d.plugins || [],
    '没有插件。在配置目录的 plugins/（或已信任工作区的 .agent/plugins/）下放 <目录>/plugin.json，再点重新加载。',
    (p) => row(p.name, p.error ? '出错' : p.tools + ' 个工具', p.error ? 'bad' : '',
      p.source + (p.mcp ? ' · MCP' : '') + (p.skills ? ' · skills' : ''), p.error || p.desc));
  section('skills', 'Skills', d.skills || [],
    '没有 skill。在工作区的 .agent/skills/ 或配置目录的 skills/ 下放 <目录>/SKILL.md（frontmatter 写 name 和 description），再点重新加载。',
    (s) => row(s.name, null, null, s.source, s.desc, useBtn('使用', '/skill ' + s.name + ' ')));
  section('agents', '子代理角色', d.roles || [],
    d.task_tool ? '没有角色。' : 'task 工具没开（工具集是 minimal）。',
    (r) => row(r.name, r.read_only ? '只读' : null, null, r.source + (r.model ? ' · ' + r.model : ''), r.desc,
      d.task_tool ? useBtn('交给它', '用 ' + r.name + ' 子代理（task 工具）来 ') : null));
  section('runs', '本会话的子代理运行', d.runs || [], '这个会话还没有用过子代理。',
    (r) => row(r.role + ' · ' + r.file, RUN_ZH[r.status] || r.status,
      r.status === 'done' ? 'ok' : r.status === 'error' ? 'bad' : '',
      r.steps + ' 步 · ' + r.tools + ' 次工具 · ' + fmtSecs(r.ms || 0), r.desc));
  const close = el('div', 'buttons');
  close.appendChild(Object.assign(el('button', null, '关闭'), { onclick: closeModal }));
  box.appendChild(close);
  openModal(box, true);
  const target = secs[focus === 'skill' ? 'skills' : focus];
  if (target) setTimeout(() => target.scrollIntoView({ block: 'start' }), 0);
}

function autoGrow() {
  const t = $('input');
  t.style.height = 'auto';
  t.style.height = Math.min(t.scrollHeight, 240) + 'px';
}
async function upload(file) {
  const r = await api('api/attach?name=' + encodeURIComponent(file.name || 'pasted.png'), {
    method: 'POST',
    headers: { 'Content-Type': file.type || 'application/octet-stream' },
    body: file,
  });
  try { await readReply(r); } catch (e) { toast('上传失败：' + errMsg(e)); return; }
  pendingPreviews.push({ src: URL.createObjectURL(file), name: file.name || 'pasted.png' });
  renderPending();
  if (state.sees_images === 0) toast((state.model || '当前模型') + ' 不识图，这张图不会发给模型', 'warn');
}

/* --- layout -------------------------------------------------------------- */

function toggleSide() {
  if (window.innerWidth <= 900) {
    const open = document.body.classList.toggle('side-open');
    document.body.classList.toggle('drawer-open', open);
    document.body.classList.remove('panel-open');
    return;
  }
  localStorage.setItem('cst.side', document.body.classList.toggle('no-side') ? '0' : '1');
}
function togglePanel() {
  if (window.innerWidth <= 900) {
    const open = document.body.classList.toggle('panel-open');
    document.body.classList.toggle('drawer-open', open);
    document.body.classList.remove('side-open');
    return;
  }
  localStorage.setItem('cst.panel', document.body.classList.toggle('no-panel') ? '0' : '1');
}
function closeDrawers() {
  document.body.classList.remove('side-open', 'panel-open', 'drawer-open');
}
function applyTheme(t) {
  document.documentElement.dataset.theme = t;
  localStorage.setItem('cst.theme', t);
}
function toggleTheme() {
  applyTheme(document.documentElement.dataset.theme === 'dark' ? 'light' : 'dark');
}

/* --- wiring -------------------------------------------------------------- */

$('btn-send').onclick = () => send();
$('btn-stop').onclick = () => post('api/cancel', {}).catch(toastErr);
$('btn-new').onclick = newSession;
$('btn-refresh-sessions').onclick = () => loadSessions();
$('sess-search').addEventListener('input', renderSessionList);
$('btn-diff').onclick = () => showDiff();
$('btn-edit-cancel').onclick = cancelEdit;
$('chip-model').onclick = () => modelPopover($('chip-model'));
$('chip-approval').onclick = () => approvalPopover($('chip-approval'));
$('btn-plus').onclick = () => plusPopover($('btn-plus'));
$('cost').onclick = () => usagePopover($('cost'));
$('btn-menu').onclick = () => menuPopover($('btn-menu'));
$('usage').onclick = () => usagePopover($('cost'));
$('btn-settings').onclick = showSettings;
$('btn-collapse').onclick = toggleSide;
$('btn-side').onclick = toggleSide;
$('btn-drawer').onclick = toggleSide;
$('btn-panel').onclick = togglePanel;
$('btn-panel-close').onclick = togglePanel;
$('btn-theme').onclick = toggleTheme;
$('btn-undo').onclick = undo;
$('to-bottom').onclick = () => scrollDown(true);
for (const b of $('seg-mode').children) {
  b.onclick = async () => {
    try {
      await post('api/config', { plan_mode: b.dataset.mode === 'plan' });
      $('status').textContent = b.dataset.mode === 'plan' ? '计划模式：只读' : '构建模式：可写';
    } catch (e) { toastErr(e); }
  };
}
$('input').addEventListener('keydown', (e) => {
  if (e.isComposing) return;
  if (!$('slash').hidden && slashItems.length) {
    const n = slashItems.length;
    if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
      e.preventDefault();
      slashSel = (slashSel + (e.key === 'ArrowDown' ? 1 : n - 1)) % n;
      renderSlash();
      return;
    }
    if ((e.key === 'Tab' && !e.shiftKey) || (e.key === 'Enter' && !e.shiftKey)) {
      e.preventDefault();
      acceptSlash(slashItems[slashSel], e.key === 'Enter');
      return;
    }
    if (e.key === 'Escape') {
      e.preventDefault();
      e.stopPropagation();
      hideSlash();
      return;
    }
  }
  if (e.key === 'Tab' && e.shiftKey) { e.preventDefault(); cycleApproval(); return; }
  if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); send(); }
});
$('input').addEventListener('input', () => { autoGrow(); syncSend(); slashSuggest(); });
$('input').addEventListener('blur', () => setTimeout(hideSlash, 150));
$('scroll').addEventListener('scroll', updateJump);
$('scroll').addEventListener('wheel', closePop, { passive: true });
$('file').addEventListener('change', async (e) => {
  for (const f of e.target.files) await upload(f);
  e.target.value = '';
});
document.addEventListener('paste', async (e) => {
  const items = (e.clipboardData || {}).items || [];
  for (const item of items) {
    if (item.kind === 'file' && item.type.startsWith('image/')) {
      e.preventDefault();
      await upload(item.getAsFile());
    }
  }
});
document.addEventListener('dragover', (e) => e.preventDefault());
document.addEventListener('drop', async (e) => {
  if (!e.dataTransfer.files.length) return;
  e.preventDefault();
  for (const f of e.dataTransfer.files) await upload(f);
});
$('backdrop').onclick = closeDrawers;
$('lightbox').onclick = (e) => { if (e.target === $('lightbox')) closeLightbox(); };
$('lb-close').onclick = closeLightbox;
$('lb-prev').onclick = () => stepLightbox(-1);
$('lb-next').onclick = () => stepLightbox(1);

/* --- go ------------------------------------------------------------------ */

/* the rail/panel/theme classes are already on <body> from the inline script in
 * index.html, so nothing here has to re-derive them */
autoGrow();
syncSend();
renderFilesPanel();
connect();
loadSession().catch(toastErr);
loadSessions();
getJSON('api/state').then(applyState).catch(toastErr);
/* deep link: ?open=chip-approval / ?open=cost opens that popover once the
 * state is in, so a screenshot or a bookmark can land on it directly */
const wantsOpen = new URLSearchParams(location.search).get('open');
if (wantsOpen) setTimeout(() => { const a = $(wantsOpen); if (a) a.click(); }, 900);