// src/genesis/server/static/chat.js
// Genesis Chat UI 业务逻辑（v1 拆分自原 chat.html 内联 <script> 段，行 1-704）
// 本次完整恢复，零行为变更

let sid = null;
let progressWs = null;
let draftProject = null;     // 下一空白会话将绑定/已绑的项目（原 currentProject）
let activeProject = null;    // 当前已落库会话绑定的项目（来自后端）
let projects = [];
let drawerOpen = false;
let drawerSelected = null;   // 当前抽屉中编辑的项目名（null = 新建模式）
let lastTriggerEl = null;    // 打开抽屉/下拉前的焦点元素（C1）
let drawerDirty = false;     // 抽屉表单是否有未保存改动（B6）
  let drawerSnapshot = null;   // loadDrawerForm 时的字段快照（B6）

// 状态逻辑统一走 chat_state.js；若静态路由未就绪则回退内联实现，避免整页脚本崩溃
const GenesisState = window.GenesisState || {
  autoBindProject: (d, p) => (d === null && p.length ? p[0].name : (d && !p.find(x => x.name === d) ? (p.length ? p[0].name : null) : d)),
  shouldHideUploadSelect: () => false,
  resolveUploadType: (_a, _d, v) => v,
  computeDrawerSnapshot: (f) => f.map(x => (x == null ? '' : String(x)).trim()).join(String.fromCharCode(1)),
  isDrawerDirty: (n, s) => n !== s,
  buildWelcome: (d) => d === null ? '请新建项目或者选择项目'
    : '你好！我是 Genesis 概要设计书生成 Agent。请先上传要件定义 xlsx（模板/规则/代码库已由项目「' + d + '」提供）。',
  emptyHeadline: () => '有什么可以帮到你的？',
  quickPrompts: () => ['生成概要设计书', '影响调查', '用中文生成', '现在什么状态？'],
};

const chatEl = document.getElementById('chat');
const inputEl = document.getElementById('input');
const sendBtn = document.getElementById('send');
const sessionTitle = document.getElementById('session-title');
const psMenu = document.getElementById('ps-menu');
const psName = document.getElementById('ps-name');
const drawer = document.getElementById('proj-drawer');

function addMsg(role, html) {
  const m = document.createElement('div');
  m.className = 'msg ' + role;
  m.innerHTML = '<div class="bubble">' + html + '</div>';
  chatEl.appendChild(m);
  chatEl.scrollTop = chatEl.scrollHeight;
  return m;
}
function esc(s) { return String(s).replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c])); }
function setText(el, v) { if (el) el.textContent = v; }
function autoGrowInput() {
  if (!inputEl) return;
  inputEl.style.height = 'auto';
  inputEl.style.height = Math.min(inputEl.scrollHeight, 160) + 'px';
}
function showTyping() { return addMsg('assistant', '<span class="typing">思考中…</span>'); }

async function api(method, url, body) {
  const opt = { method, headers: {} };
  if (body !== undefined) { opt.headers['Content-Type'] = 'application/json'; opt.body = JSON.stringify(body); }
  const r = await fetch(url, opt);
  const data = await r.json().catch(() => ({}));
  if (!r.ok) throw new Error(data.detail?.message || r.status);
  return data;
}

// ---------- 会话列表 ----------
async function refreshSessions() {
  let all = [];
  try { all = await api('GET', '/api/sessions?user_id=default'); } catch (e) { all = []; }
  all.sort((a, b) => (b.updated_at || '').localeCompare(a.updated_at || ''));
  const grouped = GenesisState.groupSessionsByProject(all);
  renderProjectTree(grouped.byProject);
  renderOtherSessions(grouped.other);
}

// 单个会话行（项目组 / 其他会话共用）
function renderSessItem(s) {
  const el = document.createElement('div');
  el.className = 'sess' + (s.session_id === sid ? ' active' : '');
  const rawName = (s.name || '新').trim();
  const avatar = rawName ? Array.from(rawName)[0] : '新';
  const palette = ['#1a73e8', '#34a853', '#fbbc05', '#ea4335', '#8e24aa', '#0097a7', '#5f6368'];
  let h = 0;
  for (let i = 0; i < rawName.length; i++) h = (h * 31 + rawName.charCodeAt(i)) | 0;
  const color = palette[Math.abs(h) % palette.length];
  el.innerHTML =
    '<div class="avatar" style="background:' + color + ';">' + esc(avatar) + '</div>' +
    '<div class="info">' +
      '<div class="name">' + esc(s.name || '新会话') + '</div>' +
      '<div class="meta">' + esc(s.status) + '</div>' +
    '</div>' +
    '<button class="kebab" title="更多" aria-label="更多操作">⋯</button>' +
    '<button class="del" title="删除会话" aria-label="删除会话 ' + esc(rawName) + '">×</button>';
  el.querySelector('.info').onclick = () => loadSession(s.session_id);
  const delBtn = el.querySelector('.del');
  delBtn.onclick = (ev) => { ev.stopPropagation(); deleteSession(s.session_id); };
  const kebab = el.querySelector('.kebab');
  kebab.onclick = (ev) => openSessMenu(ev, s.session_id, s.name || '新会话', el);
  return el;
}

// 项目展开/收起状态
let collapsedProjects = null;
function loadCollapsedProjects() {
  if (collapsedProjects) return collapsedProjects;
  collapsedProjects = new Set();
  try {
    const raw = localStorage.getItem('genesis_collapsed_projects');
    if (raw) collapsedProjects = new Set(JSON.parse(raw));
  } catch (e) { collapsedProjects = new Set(); }
  return collapsedProjects;
}
function saveCollapsedProjects() {
  try { localStorage.setItem('genesis_collapsed_projects', JSON.stringify(Array.from(loadCollapsedProjects()))); } catch (e) { /* 忽略 */ }
}

// 显式「不选择项目」标记（F1）
const EXPLICIT_NONE_KEY = 'genesis_project_explicit_none';
function readExplicitNone() {
  try { return localStorage.getItem(EXPLICIT_NONE_KEY) === '1'; } catch (e) { return false; }
}
function setExplicitNone(v) {
  try { if (v) localStorage.setItem(EXPLICIT_NONE_KEY, '1'); else localStorage.removeItem(EXPLICIT_NONE_KEY); } catch (e) { /* 忽略 */ }
}

// 项目树渲染
function renderProjectTree(byProj) {
  const box = document.getElementById('project-tree');
  if (!box) return;
  const collapsed = loadCollapsedProjects();
  const names = [];
  for (const p of projects) names.push(p.name);
  for (const k of Object.keys(byProj || {})) { if (k && names.indexOf(k) < 0) names.push(k); }
  box.innerHTML = '';
  for (const name of names) {
    const sessList = (byProj && byProj[name]) || [];
    const isCurrent = (draftProject === name);
    const hasActive = sessList.some(s => s.session_id === sid);
    const isCollapsed = collapsed.has(name);
    const disp = (((projects || []).find(p => p.name === name)) || {}).display_name || name;
    const grp = document.createElement('div');
    grp.className = 'proj-group' + (isCurrent ? ' current' : '') + (hasActive ? ' has-active' : '');
    const row = document.createElement('div');
    row.className = 'proj-row';
    row.innerHTML = '<span class="proj-caret">' + (isCollapsed ? '▸' : '▾') + '</span>'
      + '<span class="proj-name">' + esc(disp) + '</span>'
      + '<button class="proj-config" type="button" title="配置">⚙</button>';
    grp.appendChild(row);
    if (!isCollapsed) {
      const sessBox = document.createElement('div');
      sessBox.className = 'proj-sessions';
      for (const s of sessList) sessBox.appendChild(renderSessItem(s));
      grp.appendChild(sessBox);
    }
    row.onclick = (ev) => {
      if (ev.target && ev.target.closest && ev.target.closest('.proj-config')) return;
      onProjectRowClick(name);
    };
    row.querySelector('.proj-config').onclick = (ev) => {
      ev.stopPropagation();
      if (!guardDrawerDirty()) return;
      openProjectDrawer(name);
    };
    box.appendChild(grp);
  }
}

function onProjectRowClick(name) {
  if (!guardDrawerDirty()) return;
  if (draftProject !== name) {
    draftProject = name;
    setExplicitNone(false);
    applyProjectContext();
    renderProjectSwitcher();
    updateUploadBar();
  }
  const collapsed = loadCollapsedProjects();
  if (collapsed.has(name)) collapsed.delete(name); else collapsed.add(name);
  saveCollapsedProjects();
  refreshSessions();
}

function renderOtherSessions(list) {
  const box = document.getElementById('other-session-list');
  if (!box) return;
  box.innerHTML = '';
  for (const s of (list || [])) box.appendChild(renderSessItem(s));
}

async function deleteSession(targetSid) {
  if (!confirm('确认删除该会话？此操作不可撤销。')) return;
  try {
    await api('DELETE', '/api/sessions/' + encodeURIComponent(targetSid));
  } catch (e) {
    addMsg('error', '删除失败：' + esc(String(e)));
    return;
  }
  if (targetSid === sid) {
    // 删除的是当前会话 → 自动新建并清空
    await newSession();
  } else {
    await refreshSessions();
  }
}

// ---------- 项目配置 ----------
async function loadProjects() {
  try {
    projects = await api('GET', '/api/projects');
  } catch (e) {
    projects = [];
  }
  // 启动自动绑首项 / 已删项目回退首项（统一由 GenesisState.autoBindProject 处理）
  draftProject = GenesisState.autoBindProject(draftProject, projects, readExplicitNone());
  applyProjectContext();
  renderProjectSwitcher();
  if (drawerOpen) loadDrawerForm(drawerSelected);
}

function applyProjectContext() {
  setText(psName, draftProject || '未选择项目');
}

function renderProjectSwitcher() {
  let html = '<div class="ps-item' + (draftProject === null ? ' active' : '') + '" data-name="">'
    + '<span>不选择项目</span><span class="ps-check">✓</span></div>';
  for (const p of projects) {
    html += '<div class="ps-item' + (p.name === draftProject ? ' active' : '') + '" data-name="' + esc(p.name) + '">'
      + '<span>' + esc(p.display_name || p.name) + '</span><span class="ps-check">✓</span></div>';
  }
  psMenu.innerHTML = html;
  psMenu.querySelectorAll('.ps-item[data-name]').forEach(it => {
    it.onclick = () => {
      if (!guardDrawerDirty()) return;
      draftProject = it.dataset.name === '' ? null : it.dataset.name;
      setExplicitNone(draftProject === null);
      applyProjectContext();
      renderProjectSwitcher();
      updateUploadBar();
      toggleProjectSwitcher(false);
    };
  });
}


function toggleProjectSwitcher(force) {
  const willOpen = force === undefined ? !psMenu.classList.contains('open') : !!force;
  psMenu.classList.toggle('open', willOpen);
}

// ---------- 抽屉 ----------
function openProjectDrawer(projectName) {
  drawerOpen = true;
  toggleProjectSwitcher(false);
  drawer.classList.add('open');
  const mask = document.getElementById('drawer-mask');
  if (mask) mask.classList.add('show');
  const sel = (projectName === undefined || projectName === null) ? drawerSelected : projectName;
  try { loadDrawerForm(sel); } catch (e) { console.error(e); }
}

function closeProjectDrawer() {
  if (!guardDrawerDirty()) return;
  drawerOpen = false;
  drawer.classList.remove('open');
  const mask = document.getElementById('drawer-mask');
  if (mask) mask.classList.remove('show');
}

function loadDrawerForm(projectName) {
  drawerSelected = (projectName === undefined) ? drawerSelected : projectName;
  const nameEl = document.getElementById('pf-name');
  const dispEl = document.getElementById('pf-display');
  const tplEl = document.getElementById('pf-template');
  const wrEl = document.getElementById('pf-write');
  const rulesEl = document.getElementById('pf-rules');
  const codeEl = document.getElementById('pf-code');
  const designEl = document.getElementById('pf-design');
  const delBtn = document.getElementById('pf-delete');
  if (drawerSelected) {
    const p = projects.find(x => x.name === drawerSelected);
    if (p) {
      nameEl.value = p.name; nameEl.readOnly = true;
      dispEl.value = p.display_name || '';
      tplEl.value = p.template || '';
      wrEl.value = p.write_instruction || '';
      rulesEl.value = (p.rules || []).join(', ');
      codeEl.value = p.existing_system_code_dir || '';
      designEl.value = p.design_docs_dir || '';
      delBtn.hidden = false;
    }
  } else {
    nameEl.value = ''; nameEl.readOnly = false;
    dispEl.value = '';
    tplEl.value = ''; wrEl.value = ''; rulesEl.value = ''; codeEl.value = ''; designEl.value = '';
    delBtn.hidden = true;
  }
  // B6：记录字段快照用于脏检测
  drawerSnapshot = drawerSnapshotNow();
}

// B6：抽屉未保存变更守卫
function drawerSnapshotNow() {
  return GenesisState.computeDrawerSnapshot([
    document.getElementById('pf-name').value,
    document.getElementById('pf-display').value,
    document.getElementById('pf-template').value,
    document.getElementById('pf-write').value,
    document.getElementById('pf-rules').value,
    document.getElementById('pf-code').value,
    document.getElementById('pf-design').value,
  ]);
}
function isDrawerDirty() {
  if (!drawerOpen || drawerSnapshot === null) return false;
  return GenesisState.isDrawerDirty(drawerSnapshotNow(), drawerSnapshot);
}
function guardDrawerDirty() {
  if (isDrawerDirty()) return confirm('有未保存的修改，确定放弃？');
  return true;
}

// P0‑C：抽屉字段级红框。命中关键字 → 给对应输入加 .invalid 3 秒后清除。
// 关键字与 store.py 的 ProjectConfigError 中文 label 对齐。
const PF_LABEL_TO_FIELD = {
  '项目名': 'pf-name',
  '模板': 'pf-template',
  '做成说明书': 'pf-write',
  '规则': 'pf-rules',
  '既有系统代码库': 'pf-code',
  '既有设计文档目录': 'pf-design',
};
function clearPfInvalid() {
  ['pf-name','pf-display','pf-template','pf-write','pf-rules','pf-code','pf-design']
    .forEach(id => document.getElementById(id).classList.remove('invalid'));
}
function flagPfInvalidByMessage(message) {
  if (!message) return;
  for (const [label, fid] of Object.entries(PF_LABEL_TO_FIELD)) {
    if (message.indexOf(label) >= 0) {
      const el = document.getElementById(fid);
      el.classList.add('invalid');
      el.focus();
      setTimeout(() => el.classList.remove('invalid'), 3000);
    }
  }
}
// 任意输入清掉自身红框（避免"红着输入"误导）
['pf-name','pf-display','pf-template','pf-write','pf-rules','pf-code','pf-design']
  .forEach(id => document.getElementById(id).addEventListener('input', (e) => e.target.classList.remove('invalid')));


async function saveDrawerProject() {
  clearPfInvalid();
  const body = {
    name: document.getElementById('pf-name').value.trim(),
    display_name: document.getElementById('pf-display').value.trim(),
    template: document.getElementById('pf-template').value.trim(),
    write_instruction: document.getElementById('pf-write').value.trim(),
    rules: document.getElementById('pf-rules').value.split(',').map(s => s.trim()).filter(Boolean),
    existing_system_code_dir: document.getElementById('pf-code').value.trim(),
    design_docs_dir: document.getElementById('pf-design').value.trim(),
  };
  if (!body.name) {
    flagPfInvalidByMessage('项目名');
    addMsg('error', '项目名不能为空');
    return;
  }
  try {
    const cfg = await api('POST', '/api/projects', body);
    draftProject = cfg.name;
    drawerSelected = cfg.name;
    await loadProjects();
    addMsg('assistant', '项目「' + esc(cfg.display_name || cfg.name) + '」已保存。');
    closeProjectDrawer();
  } catch (e) {
    // 400 / PROJECT_CONFIG_INVALID：字段级红框定位
    flagPfInvalidByMessage(String(e));
    addMsg('error', '保存项目失败：' + esc(String(e)));
  }
}

async function deleteDrawerProject() {
  if (!drawerSelected) return;
  if (!confirm('确认删除项目「' + drawerSelected + '」？此操作不可撤销。')) return;
  const deleted = drawerSelected;
  try {
    await api('DELETE', '/api/projects/' + encodeURIComponent(deleted));
  } catch (e) {
    addMsg('error', '删除项目失败：' + esc(String(e)));
    return;
  }
  addMsg('assistant', '项目「' + esc(deleted) + '」已删除。');
  // P1‑F：先记住被删的，再清 drawerSelected；避免"先 null 后比较"恒假 bug
  drawerSelected = null;
  if (draftProject === deleted) {
    // 当前选的就是被删的项目 → 清空偏好（autoBindProject 会从剩余项目重选）
    draftProject = null;
  }
  await loadProjects();
  loadDrawerForm(null);
}

// ---------- 侧边栏折叠 ----------
function toggleSidebar(force) {
  const el = document.getElementById('sidebar');
  const willCollapse = force === undefined ? !el.classList.contains('collapsed') : !!force;
  el.classList.toggle('collapsed', willCollapse);
  // 切换折叠/展开图标 + title + data-state
  const btn = document.getElementById('sidebar-toggle');
  if (btn) {
    if (willCollapse) {
      btn.textContent = '»';
      btn.title = '展开侧边栏';
      btn.dataset.state = 'collapsed';
    } else {
      btn.textContent = '«';
      btn.title = '折叠侧边栏';
      btn.dataset.state = 'expanded';
    }
  }
  try { localStorage.setItem('genesis_sidebar_collapsed', willCollapse ? '1' : '0'); } catch (e) { /* localStorage 不可用时忽略 */ }
}

// ---------- 上传区：始终显示完整类型下拉 ----------
// P0‑B：选项目时也允许补传 template / write_instruction / rules / existing_system，
// 不再藏起入口。"项目已预置 template 时再上传 template"在上传处用 confirm() 显式确认。
function updateUploadBar() {
  const sel = document.getElementById('file-type');
  const hint = document.getElementById('proj-hint');
  if (sel) sel.style.display = '';
  if (!hint) return;
  // 默认 file_type 仍为 requirements（最常用），但下拉始终可改。
  if (sel && sel.value !== 'requirements') sel.value = 'requirements';
  if (draftProject) {
    hint.textContent = '默认上传要件定义 xlsx；如需补传模板/规则/既有系统 zip，请在下拉中选择对应类型。';
  } else {
    hint.textContent = '请选择 file_type 后上传（未选项目时，模板/规则仍可手动上传）。';
  }
}

// ---------- 空态/欢迎渲染（豆包式：主标题 + 副提示 + 建议卡） ----------
function insertPrompt(text) {
  inputEl.value = text;
  inputEl.focus();
  try { inputEl.setSelectionRange(text.length, text.length); } catch (e) { /* 忽略 */ }
  autoGrowInput();
}

function renderEmptyOrWelcome() {
  chatEl.innerHTML = '';
  const wrap = document.createElement('div');
  wrap.className = 'empty-state';
  const cards = GenesisState.quickPrompts().map(t =>
    '<button class="suggest-card" type="button" data-prompt="' + esc(t) + '">' + esc(t) + '</button>'
  ).join('');
  wrap.innerHTML =
    '<div class="es-logo">G</div>' +
    '<h2 class="es-title">' + esc(GenesisState.emptyHeadline()) + '</h2>' +
    '<p class="es-sub">' + GenesisState.buildWelcome(draftProject) + '</p>' +
    '<div class="suggests">' + cards + '</div>';
  chatEl.appendChild(wrap);
  wrap.querySelectorAll('.suggest-card').forEach(b => {
    b.onclick = () => insertPrompt(b.dataset.prompt);
  });
}

// ---------- 会话「⋯」菜单 + 重命名 ----------
let sessMenuTarget = null;
function openSessMenu(ev, sidVal, name, el) {
  ev.stopPropagation();
  sessMenuTarget = { sid: sidVal, name: name, el: el };
  const m = document.getElementById('sess-menu');
  if (!m) return;
  m.hidden = false;
  const r = ev.currentTarget.getBoundingClientRect();
  m.style.top = (r.bottom + 4) + 'px';
  m.style.left = Math.max(8, r.right - 150) + 'px';
}
function closeSessMenu() {
  const m = document.getElementById('sess-menu');
  if (m) m.hidden = true;
}
function startRenameSession(el, s) {
  const nameEl = el.querySelector('.name');
  if (!nameEl) return;
  const input = document.createElement('input');
  input.className = 'rename-input';
  input.value = s.name || '';
  input.maxLength = 100;
  nameEl.replaceWith(input);
  input.focus(); input.select();
  let done = false;
  const finish = async (save) => {
    if (done) return; done = true;
    const newName = input.value.trim();
    if (save && newName && newName !== (s.name || '')) {
      try {
        const r = await api('PATCH', '/api/sessions/' + encodeURIComponent(s.session_id), { name: newName });
        if (s.session_id === sid) setText(sessionTitle, r.name || newName);
      } catch (e) {
        addMsg('error', '重命名失败：' + esc(String(e)));
      }
    }
    await refreshSessions();
  };
  input.addEventListener('keydown', (e) => {
    if (e.key === 'Enter') { e.preventDefault(); finish(true); }
    else if (e.key === 'Escape') { e.preventDefault(); finish(false); }
  });
  input.addEventListener('blur', () => finish(true));
}

// ---------- 会话创建/加载 ----------
async function newSession() {
   if (progressWs) { try { progressWs.close(); } catch (e) {} } progressWs = null;
  sid = null;
  activeProject = null;
  // 保留 draftProject（当前顶栏已选项目），使新会话继承项目绑定（§4.2）
  try { localStorage.removeItem('genesis_session'); } catch (e) { /* 忽略 */ }
  chatEl.innerHTML = '';
  setText(sessionTitle, '未创建会话');
  updateUploadBar();
  await refreshRagStats();
  await refreshSessions();
  renderEmptyOrWelcome();
}

async function loadSession(id) {
  try {
    const rec = await api('GET', '/api/sessions/' + encodeURIComponent(id));
    sid = id;
    activeProject = rec.project || null;
    // P1‑D：不再隐式覆盖 draftProject。会话事实(activeProject)与用户偏好(draftProject)
    // 分层；若不一致，由提示条让用户主动选择。
    // draftProject = rec.project || null;   // 删除：原行为会悄悄改用户偏好
    applyProjectContext();
    setText(sessionTitle, (rec.name || '新会话'));
    if (progressWs) { try { progressWs.close(); } catch (e) {} }
    progressWs = GenesisWS.connectProgressWs(id, {
      onProgress: (e) => GenesisWS.applyProgressEvent(e, (role, text) => addMsg(role, text)),
      onClose: () => {},
    });
    const msgs = await api('GET', '/api/chat/' + encodeURIComponent(id) + '/messages');
    chatEl.innerHTML = '';
    for (const m of msgs) {
      const roleMap = { user: 'user', progress: 'progress', error: 'error' };
      const role = roleMap[m.role] || 'assistant';
      addMsg(role, esc(m.content));
    }
    updateUploadBar();
    await refreshRagStats();
    await refreshSessions();
    try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 忽略 */ }
    renderProjectMismatchHint();
  } catch (e) {
    addMsg('error', '加载会话失败：' + esc(String(e)));
  }
}

// P1‑D：项目不匹配提示条。activeProject 与 draftProject 不一致时显示，
// "切到该项目" → 写 draftProject = activeProject，刷新；
// "保留"      → 写入 sessionStorage 标记，刷新；后续 loadSession 不再提示。
function renderProjectMismatchHint() {
  const old = document.getElementById('proj-mismatch-hint');
  if (old) old.remove();
  if (!sid) return;
  if (!activeProject) return;
  if (activeProject === draftProject) return;
  // 已"保留"过本会话的不再提示
  let skipped = {};
  try { skipped = JSON.parse(sessionStorage.getItem('genesis_skipped_project_hint') || '{}'); } catch (e) { skipped = {}; }
  if (skipped[sid] === activeProject) return;
  const wrap = document.createElement('div');
  wrap.id = 'proj-mismatch-hint';
  wrap.className = 'msg assistant';
  wrap.innerHTML =
    '<div class="bubble">' +
    '该会话属于项目 <strong>' + esc(activeProject) + '</strong>，' +
    '当前项目为 <strong>' + esc(draftProject || '（未选择）') + '</strong>。' +
    '<div class="actions">' +
    '<a href="#" data-act="switch">切到该项目</a>' +
    '<a href="#" data-act="keep">保留当前项目</a>' +
    '</div></div>';
  chatEl.prepend(wrap);
  wrap.querySelector('[data-act="switch"]').onclick = (e) => {
    e.preventDefault();
    draftProject = activeProject;
    applyProjectContext();
    renderProjectSwitcher();
    updateUploadBar();
    refreshSessions();
    wrap.remove();
  };
  wrap.querySelector('[data-act="keep"]').onclick = (e) => {
    e.preventDefault();
    try {
      skipped[sid] = activeProject;
      sessionStorage.setItem('genesis_skipped_project_hint', JSON.stringify(skipped));
    } catch (er) { /* 忽略 */ }
    wrap.remove();
  };
}

// P2‑H：send() in-flight 锁，防止快速双击产生重复请求
let sendInFlight = false;
async function send() {
  if (sendInFlight) return;   // in-flight 期间再次进入直接忽略
  const text = inputEl.value.trim();
  if (!text) return;
  sendInFlight = true;
  if (!sid) {
    // 首条消息：先落库会话（D-v4）
    try {
      const d = await api('POST', '/api/sessions', { user_id: 'default', project: draftProject || null });
      sid = d.session_id;
      activeProject = draftProject || null;
      setText(sessionTitle, (d.name || '新会话'));
      try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 忽略 */ }
      await refreshSessions();
    } catch (e) {
      addMsg('error', '创建会话失败：' + esc(String(e)));
      return;
    }
  }
  if (progressWs) { try { progressWs.close(); } catch (e) {} }
  progressWs = GenesisWS.connectProgressWs(sid, {
    onProgress: (e) => GenesisWS.applyProgressEvent(e, (role, text) => addMsg(role, text)),
    onClose: () => {},
  });
  inputEl.value = '';
  inputEl.style.height = '';
  const _es = chatEl.querySelector('.empty-state');
  if (_es) _es.remove();
  addMsg('user', esc(text));
  const typing = showTyping();
  sendBtn.disabled = true;
  try {
    const res = await api('POST', '/api/chat/' + encodeURIComponent(sid) + '/messages', { content: text });
    typing.remove();
    if (res.progress && res.progress.length) {
      const items = res.progress.map(p => '<span class="progress-item ' + (p.status || 'ok') + '">' + esc(p.step) + ': ' + esc(p.detail || '') + '</span>').join('');
      addMsg('progress', items);
    }
    let replyHtml = esc(res.reply || '');
    const s = res.status;
    if (s === 'done' || s === 'writing') {
      replyHtml += '<div class="actions">'
        + '<a href="/api/sessions/' + sid + '/result/download">下载 docx</a>'
        + '<a href="/api/sessions/' + sid + '/result/preview">预览</a>'
        + '<a href="/api/sessions/' + sid + '/result/impact-report">影响调查书</a>'
        + '<a href="/api/sessions/' + sid + '/result/qa-report">QA 报告</a></div>';
    }
    addMsg('assistant', replyHtml);
  } catch (e) {
    typing.remove();
    addMsg('error', '请求失败：' + esc(String(e)));
  } finally {
    sendInFlight = false;
    sendBtn.disabled = false;
    inputEl.focus();
  }
}

document.getElementById('send').addEventListener('click', send);
inputEl.addEventListener('keydown', e => {
  if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); send(); }
});
inputEl.addEventListener('input', autoGrowInput);
document.getElementById('new-chat').addEventListener('click', () => newSession().catch(e => addMsg('error', esc(String(e)))));
document.getElementById('sidebar-toggle').addEventListener('click', () => toggleSidebar());
document.getElementById('ps-current').addEventListener('click', (e) => { e.stopPropagation(); lastTriggerEl = e.currentTarget; toggleProjectSwitcher(); });
document.getElementById('drawer-close').addEventListener('click', closeProjectDrawer);
document.getElementById('drawer-mask').addEventListener('click', closeProjectDrawer);
document.getElementById('pf-save').addEventListener('click', saveDrawerProject);
document.getElementById('pf-delete').addEventListener('click', deleteDrawerProject);
document.getElementById('side-add-project').addEventListener('click', () => {
  if (!guardDrawerDirty()) return;
  openProjectDrawer(null);
});
document.getElementById('tb-upload').addEventListener('click', () => {
  const panel = document.getElementById('upload-panel');
  if (panel) panel.hidden = !panel.hidden;
});
document.getElementById('sm-rename').addEventListener('click', (ev) => {
  ev.stopPropagation();
  const t = sessMenuTarget;
  closeSessMenu();
  if (t) startRenameSession(t.el, { session_id: t.sid, name: t.name });
});

// ---------- P0‑A：RAG 开关 + 状态徽标 + 开始影响调查 ----------
const ragEnabledEl = document.getElementById('rag-enabled');
const ragStatsEl   = document.getElementById('rag-stats');
const ragBarEl     = document.getElementById('rag-bar');
const impactBtnEl  = document.getElementById('impact-btn');

const RAG_LS_KEY = 'genesis_rag_enabled';
function readRagFlag() {
  try { return localStorage.getItem(RAG_LS_KEY) === '1'; } catch (e) { return false; }
}
function writeRagFlag(v) {
  try { localStorage.setItem(RAG_LS_KEY, v ? '1' : '0'); } catch (e) { /* 忽略 */ }
}
ragEnabledEl.addEventListener('change', () => { writeRagFlag(ragEnabledEl.checked); updateImpactButton(); });

async function refreshRagStats() {
  // 无 sid → 隐藏 RAG 条
  if (!sid) {
    ragBarEl.hidden = true;
    return;
  }
  ragBarEl.hidden = false;
  let stats = { chunks: 0, rag_enabled: false };
  try {
    stats = await api('GET', '/api/sessions/' + encodeURIComponent(sid) + '/rag-stats');
  } catch (e) {
    stats = { chunks: 0, rag_enabled: false };
  }
  const n = Number(stats.chunks) || 0;
  setText(ragStatsEl, n > 0
    ? 'RAG 已索引 ' + n + ' 片段'
    : 'RAG 0 片段（请在项目配置中设置代码库目录）');
  ragStatsEl.classList.toggle('ready', n > 0);
  ragStatsEl.classList.toggle('zero', n === 0);
  // 开关可用性：必须先有 RAG 索引才能用
  ragEnabledEl.disabled = n === 0;
  if (n === 0) {
    ragEnabledEl.checked = false;
    writeRagFlag(false);
    ragEnabledEl.parentElement.title = '请在项目配置中设置既有系统代码库目录';
  } else {
    ragEnabledEl.checked = readRagFlag();
    ragEnabledEl.parentElement.title = ragEnabledEl.checked
      ? 'RAG 检索结果会注入到 LLM prompt'
      : '勾选后启用 RAG 检索';
  }
  updateImpactButton();
}

function updateImpactButton() {
  // 已有 RAG 索引（rag-stats 决定） 且有 sid 才能影响
  if (!sid) { impactBtnEl.disabled = true; return; }
  const hasRag = (Number(ragStatsEl.dataset.chunks || 0) > 0) || !ragEnabledEl.disabled;
  impactBtnEl.disabled = !hasRag;
  setText(impactBtnEl, ragEnabledEl.checked
    ? '开始影响调查（启用 RAG）'
    : '开始影响调查');
}

impactBtnEl.addEventListener('click', async () => {
  if (!sid) { addMsg('error', '请先发送一条消息以创建会话'); inputEl.focus(); return; }
  const useRag = !!ragEnabledEl.checked;
  impactBtnEl.disabled = true;
  const typing = showTyping();
  try {
    const url = '/api/sessions/' + encodeURIComponent(sid) + '/start-impact?use_rag=' + (useRag ? 'true' : 'false');
    const r = await fetch(url, { method: 'POST' });
    const d = await r.json();
    if (!r.ok) throw new Error(d.detail?.message || r.status);
    typing.remove();
    addMsg('progress', '<span class="progress-item ok">影响调查已提交（use_rag=' + (useRag ? 'true' : 'false') + '）</span>');
    // 让 WebSocket 把后续进度推上来；稍后用户可查 impact-result
    addMsg('assistant', '影响调查已启动。完成后可在此会话点击"预览"或访问 /result/impact-report 下载报告。');
  } catch (e) {
    typing.remove();
    addMsg('error', '影响调查失败：' + esc(String(e)));
  } finally {
    updateImpactButton();
  }
});
document.addEventListener('click', (e) => {
  // 点击切换器外部关闭下拉
  if (!document.getElementById('proj-switcher').contains(e.target)) toggleProjectSwitcher(false);
  // 点击「⋯」菜单外部关闭
  const sm = document.getElementById('sess-menu');
  if (sm && !sm.hidden && !sm.contains(e.target)) closeSessMenu();
});
document.addEventListener('keydown', (e) => {
  if (e.key === 'Escape') {
    closeSessMenu();
    if (psMenu.classList.contains('open')) toggleProjectSwitcher(false);
    else if (drawerOpen) closeProjectDrawer();
    if (lastTriggerEl) { lastTriggerEl.focus(); lastTriggerEl = null; }
  }
});

// 客户端类型 → 扩展名白名单校验（P0‑B / P1‑E）。
const UPLOAD_EXT_RULES = {
  existing_system: ['.zip'],
  requirements: ['.xlsx'],
  template: ['.docx'],
  write_instruction: ['.docx'],
  rules: ['.docx', '.xlsx'],
};
function pickExt(name) {
  const i = String(name).lastIndexOf('.');
  return i >= 0 ? String(name).slice(i).toLowerCase() : '';
}
// 项目级预置 → 提醒：再次上传将覆盖该会话的该类型文件。
// 这里用 activeProject/draftProject 对应的项目 config（projects[]）判定是否预置。
function projectHasPrefixedType(ft) {
  const name = activeProject || draftProject;
  if (!name) return false;
  const p = (projects || []).find(x => x.name === name);
  if (!p) return false;
  if (ft === 'template') return !!(p.template && p.template.trim());
  if (ft === 'write_instruction') return !!(p.write_instruction && p.write_instruction.trim());
  if (ft === 'existing_system') return !!(p.existing_system_code_dir && p.existing_system_code_dir.trim());
  if (ft === 'rules') return Array.isArray(p.rules) && p.rules.length > 0;
  return false;
}

document.getElementById('upload-btn').addEventListener('click', async () => {
  if (!sid) { addMsg('error', '请先发送一条消息以创建会话'); inputEl.focus(); return; }
  const sel = document.getElementById('file-type');
  const ft = GenesisState.resolveUploadType(activeProject, draftProject, sel.value);
  const file = document.getElementById('file-input').files[0];
  if (!file) { addMsg('error', '请选择文件'); return; }
  // P0‑B / P1‑E：客户端类型与扩展名校验
  const allowed = UPLOAD_EXT_RULES[ft];
  if (allowed) {
    const ext = pickExt(file.name);
    if (!ext || !allowed.includes(ext)) {
      addMsg('error', '类型不匹配：' + esc(ft) + ' 应为 ' + allowed.join('/') + ' 文件（当前：' + esc(file.name) + '）');
      return;
    }
  }
  // P0‑B：项目已预置同类型时显式确认覆盖（不再以"藏起入口"做隐式约束）
  if (projectHasPrefixedType(ft)) {
    const ok = confirm('项目已预置 ' + ft + '。继续上传将覆盖该会话中的此类型文件，是否继续？');
    if (!ok) return;
  }
  const fd = new FormData();
  fd.append('file_type', ft);
  fd.append('file', file);
  const statusEl = document.getElementById('upload-status');
  setText(statusEl, '上传中…');
  try {
    const r = await fetch('/api/sessions/' + encodeURIComponent(sid) + '/files', { method: 'POST', body: fd });
    const d = await r.json();
    if (!r.ok) throw new Error(d.detail?.message || r.status);
    setText(statusEl, '');
    // B5 / P1‑F：上传成功后同步 activeProject、刷新上传条与侧边栏状态
    const rec = await api('GET', '/api/sessions/' + encodeURIComponent(sid));
    activeProject = rec.project || null;
    setText(sessionTitle, (rec.name || '新会话'));
    await refreshSessions();
    updateUploadBar();   // P1‑F：上传成功后同步上传条（防状态滞后）
    await refreshRagStats();   // P0‑A：上传 existing_system 后 RAG 索引已建
    document.getElementById('file-input').value = '';   // 仅成功时清空
    addMsg('user', '[上传] ' + ft + '：' + d.file_name);
    addMsg('progress', '<span class="progress-item ok">上传完成：' + esc(d.file_name) + '（' + d.size + 'B）</span>');
  } catch (e) {
    setText(statusEl, '');
    // F1：失败保留 file-input 值，展示后端明细
    addMsg('error', '上传失败：' + esc(String(e)));
  }
});

// ---------- 启动：恢复侧边栏折叠态、上次会话 ----------
(async () => {
  try {
    const collapsed = localStorage.getItem('genesis_sidebar_collapsed') === '1';
    if (collapsed) document.getElementById('sidebar').classList.add('collapsed');
  } catch (e) { /* 忽略 */ }
  await loadProjects();
  const saved = (() => { try { return localStorage.getItem('genesis_session'); } catch (e) { return null; } })();
  if (saved) {
    // P2‑H：启动恢复前显示 loading 占位，避免空 chat 一闪
    addMsg('assistant', '正在恢复上次会话…');
    try {
      await loadSession(saved);
      // P2‑7：恢复后若会话的项目已被删，清掉 localStorage 以免下次再试
      const rec = await api('GET', '/api/sessions/' + encodeURIComponent(saved));
      const recProj = rec && rec.project;
      if (recProj && !projects.find(p => p.name === recProj)) {
        try { localStorage.removeItem('genesis_session'); } catch (e) { /* 忽略 */ }
        // 顶栏若显示的是已删项目，刷新回退
        if (draftProject === recProj) {
          draftProject = (projects.length > 0) ? projects[0].name : null;
          applyProjectContext();
        }
      }
      return;
    } catch (e) { /* 忽略，新建 */ }
  }
  newSession().catch(e => addMsg('error', esc(String(e))));
})();