// Genesis Chat UI 业务逻辑（TypeScript 版；由 esbuild 打包为 /static/chat.js）
import './chat.css';
import * as XLSX from 'xlsx';
import { api } from './api.ts';
import { must, maybe, esc, setText } from './dom.ts';
import * as GenesisState from './state.ts';
import * as GenesisWS from './ws.ts';
import type {
  SessionListItem, SessionRecord, SessionCreated, ProjectConfig, ProjectBody,
  ChatMessage, ChatReply, UploadResp, RenameResp, ProgressItem,
} from './types.ts';

let sid: string | null = null;
let progressWs: WebSocket | null = null;
let draftProject: string | null = null;     // 下一空白会话将绑定/已绑的项目
let activeProject: string | null = null;    // 当前已落库会话绑定的项目
let projects: ProjectConfig[] = [];
let drawerOpen = false;
let drawerSelected: string | null = null;   // 当前抽屉中编辑的项目名（null = 新建模式）
let lastTriggerEl: HTMLElement | null = null;
let drawerDirty = false;
let drawerSnapshot: string | null = null;

const chatEl = must<HTMLDivElement>('chat');
const inputEl = must<HTMLTextAreaElement>('input');
const sendBtn = must<HTMLButtonElement>('send');
const sessionTitle = must<HTMLElement>('session-title');
const psMenu = must<HTMLDivElement>('ps-menu');
const psName = must<HTMLElement>('ps-name');
const drawer = must<HTMLDivElement>('proj-drawer');
const drawerMask = must<HTMLDivElement>('drawer-mask');
const sidebarEl = must<HTMLDivElement>('sidebar');
const sidebarToggleBtn = must<HTMLButtonElement>('sidebar-toggle');
const projSwitcherEl = maybe<HTMLDivElement>('proj-switcher');
const sessMenuEl = must<HTMLDivElement>('sess-menu');

const fileInputEl = must<HTMLInputElement>('file-input');
const uploadStatusEl = must<HTMLElement>('upload-status');
const composerEl = must<HTMLDivElement>('composer');

interface AttachmentRef { file_type: string; name: string; }
let pendingAttachment: { file: File; name: string } | null = null;

// 输入框上方的「待发附件」区
const pendingBox = document.createElement('div');
pendingBox.className = 'pending-attach';
pendingBox.hidden = true;
composerEl.insertBefore(pendingBox, composerEl.firstChild);

function renderPendingAttachment(): void {
  if (!pendingAttachment) { pendingBox.hidden = true; pendingBox.innerHTML = ''; return; }
  pendingBox.hidden = false;
  pendingBox.innerHTML = '<span class="pending-name">📄 ' + esc(pendingAttachment.name) + '</span>'
    + '<button class="attach-remove" type="button" title="移除附件" aria-label="移除附件">×</button>';
  const rm = pendingBox.querySelector<HTMLElement>('.attach-remove');
  if (rm) rm.onclick = () => { pendingAttachment = null; renderPendingAttachment(); };
}

function attachmentChipHtml(att: AttachmentRef): string {
  return '<button class="attach-chip" type="button"'
    + ' data-ft="' + esc(att.file_type) + '" data-name="' + esc(att.name) + '">📄 ' + esc(att.name) + '</button>';
}
function bindAttachChips(root: HTMLElement): void {
  root.querySelectorAll<HTMLElement>('.attach-chip').forEach((btn) => {
    btn.onclick = () => { void openAttachmentViewer(btn.dataset.ft || 'requirements', btn.dataset.name || ''); };
  });
}
// 用户消息：文字在气泡内，附件在气泡**下方**（同一列、右对齐）
function addUserMsg(text: string, att: AttachmentRef | null): void {
  const m = document.createElement('div');
  m.className = 'msg user';
  const stack = document.createElement('div');
  stack.className = 'msg-stack';
  const bubble = document.createElement('div');
  bubble.className = 'bubble';
  bubble.innerHTML = esc(text);
  stack.appendChild(bubble);
  if (att) {
    const line = document.createElement('div');
    line.className = 'attach-line';
    line.innerHTML = attachmentChipHtml(att);
    stack.appendChild(line);
  }
  m.appendChild(stack);
  chatEl.appendChild(m);
  chatEl.scrollTop = chatEl.scrollHeight;
  bindAttachChips(m);
}

const pfName = must<HTMLInputElement>('pf-name');
const pfDisplay = must<HTMLInputElement>('pf-display');
const pfTemplate = must<HTMLInputElement>('pf-template');
const pfWrite = must<HTMLInputElement>('pf-write');
const pfRules = must<HTMLInputElement>('pf-rules');
const pfCode = must<HTMLInputElement>('pf-code');
const pfDesign = must<HTMLInputElement>('pf-design');
const pfDelete = must<HTMLButtonElement>('pf-delete');
const PF_FIELDS: HTMLInputElement[] = [pfName, pfDisplay, pfTemplate, pfWrite, pfRules, pfCode, pfDesign];

function addMsg(role: string, html: string): HTMLElement {
  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 autoGrowInput(): void {
  inputEl.style.height = 'auto';
  inputEl.style.height = Math.min(inputEl.scrollHeight, 160) + 'px';
}
function showTyping(): HTMLElement { return addMsg('assistant', '<span class="typing">思考中…</span>'); }

// ---------- 会话列表 ----------
async function refreshSessions(): Promise<void> {
  let all: SessionListItem[] = [];
  try { all = await api<SessionListItem[]>('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: SessionListItem): HTMLElement {
  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>';
  const info = el.querySelector<HTMLElement>('.info');
  if (info) info.onclick = () => { void loadSession(s.session_id); };
  const delBtn = el.querySelector<HTMLElement>('.del');
  if (delBtn) delBtn.onclick = (ev: MouseEvent) => { ev.stopPropagation(); void deleteSession(s.session_id); };
  const kebab = el.querySelector<HTMLElement>('.kebab');
  if (kebab) kebab.onclick = (ev: MouseEvent) => openSessMenu(ev, s.session_id, s.name || '新会话', el);
  return el;
}

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

// 显式「不选择项目」标记
const EXPLICIT_NONE_KEY = 'genesis_project_explicit_none';
function readExplicitNone(): boolean {
  try { return localStorage.getItem(EXPLICIT_NONE_KEY) === '1'; } catch (e) { return false; }
}
function setExplicitNone(v: boolean): void {
  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: Record<string, SessionListItem[]>): void {
  const box = maybe<HTMLDivElement>('project-tree');
  if (!box) return;
  const collapsed = loadCollapsedProjects();
  const names: string[] = [];
  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 }).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: MouseEvent) => {
      const t = ev.target as HTMLElement | null;
      if (t && t.closest && t.closest('.proj-config')) return;
      onProjectRowClick(name);
    };
    const cfgBtn = row.querySelector<HTMLElement>('.proj-config');
    if (cfgBtn) cfgBtn.onclick = (ev: MouseEvent) => {
      ev.stopPropagation();
      if (!guardDrawerDirty()) return;
      openProjectDrawer(name);
    };
    box.appendChild(grp);
  }
}

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

function renderOtherSessions(list: SessionListItem[]): void {
  const box = maybe<HTMLDivElement>('other-session-list');
  if (!box) return;
  box.innerHTML = '';
  for (const s of (list || [])) box.appendChild(renderSessItem(s));
}

async function deleteSession(targetSid: string): Promise<void> {
  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) {
    await newSession();
  } else {
    await refreshSessions();
  }
}

// ---------- 项目配置 ----------
async function loadProjects(): Promise<void> {
  try {
    projects = await api<ProjectConfig[]>('GET', '/api/projects');
  } catch (e) {
    projects = [];
  }
  draftProject = GenesisState.autoBindProject(draftProject, projects, readExplicitNone());
  applyProjectContext();
  renderProjectSwitcher();
  if (drawerOpen) loadDrawerForm(drawerSelected);
}

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

function renderProjectSwitcher(): void {
  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<HTMLElement>('.ps-item[data-name]').forEach((it) => {
    it.onclick = () => {
      if (!guardDrawerDirty()) return;
      draftProject = it.dataset.name === '' ? null : (it.dataset.name || null);
      setExplicitNone(draftProject === null);
      applyProjectContext();
      renderProjectSwitcher();
      toggleProjectSwitcher(false);
    };
  });
}

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

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

function closeProjectDrawer(): void {
  if (!guardDrawerDirty()) return;
  drawerOpen = false;
  drawer.classList.remove('open');
  drawerMask.classList.remove('show');
}

function loadDrawerForm(projectName?: string | null): void {
  drawerSelected = (projectName === undefined) ? drawerSelected : projectName;
  if (drawerSelected) {
    const p = projects.find((x) => x.name === drawerSelected);
    if (p) {
      pfName.value = p.name; pfName.readOnly = true;
      pfDisplay.value = p.display_name || '';
      pfTemplate.value = p.template || '';
      pfWrite.value = p.write_instruction || '';
      pfRules.value = (p.rules || []).join(', ');
      pfCode.value = p.existing_system_code_dir || '';
      pfDesign.value = p.design_docs_dir || '';
      pfDelete.hidden = false;
    }
  } else {
    pfName.value = ''; pfName.readOnly = false;
    pfDisplay.value = '';
    pfTemplate.value = ''; pfWrite.value = ''; pfRules.value = ''; pfCode.value = ''; pfDesign.value = '';
    pfDelete.hidden = true;
  }
  drawerSnapshot = drawerSnapshotNow();
}

function drawerSnapshotNow(): string {
  return GenesisState.computeDrawerSnapshot(PF_FIELDS.map((el) => el.value));
}
function isDrawerDirty(): boolean {
  if (!drawerOpen || drawerSnapshot === null) return false;
  return GenesisState.isDrawerDirty(drawerSnapshotNow(), drawerSnapshot);
}
function guardDrawerDirty(): boolean {
  if (isDrawerDirty()) return confirm('有未保存的修改，确定放弃？');
  return true;
}

// 抽屉字段级红框（关键字与 store.py 的 ProjectConfigError 中文 label 对齐）
const PF_LABEL_TO_FIELD: Record<string, HTMLInputElement> = {
  '项目名': pfName, '模板': pfTemplate, '做成说明书': pfWrite,
  '规则': pfRules, '既有系统代码库': pfCode, '既有设计文档目录': pfDesign,
};
function clearPfInvalid(): void {
  PF_FIELDS.forEach((el) => el.classList.remove('invalid'));
}
function flagPfInvalidByMessage(message: string): void {
  if (!message) return;
  for (const [label, el] of Object.entries(PF_LABEL_TO_FIELD)) {
    if (message.indexOf(label) >= 0) {
      el.classList.add('invalid');
      el.focus();
      setTimeout(() => el.classList.remove('invalid'), 3000);
    }
  }
}
PF_FIELDS.forEach((el) => el.addEventListener('input', () => el.classList.remove('invalid')));

async function saveDrawerProject(): Promise<void> {
  clearPfInvalid();
  const body: ProjectBody = {
    name: pfName.value.trim(),
    display_name: pfDisplay.value.trim(),
    template: pfTemplate.value.trim(),
    write_instruction: pfWrite.value.trim(),
    rules: pfRules.value.split(',').map((s) => s.trim()).filter(Boolean),
    existing_system_code_dir: pfCode.value.trim(),
    design_docs_dir: pfDesign.value.trim(),
  };
  if (!body.name) {
    flagPfInvalidByMessage('项目名');
    addMsg('error', '项目名不能为空');
    return;
  }
  try {
    const cfg = await api<ProjectConfig>('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) {
    flagPfInvalidByMessage(String(e));
    addMsg('error', '保存项目失败：' + esc(String(e)));
  }
}

async function deleteDrawerProject(): Promise<void> {
  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。');
  drawerSelected = null;
  if (draftProject === deleted) {
    draftProject = null;
  }
  await loadProjects();
  loadDrawerForm(null);
}

// ---------- 侧边栏折叠 ----------
function toggleSidebar(force?: boolean): void {
  const willCollapse = force === undefined ? !sidebarEl.classList.contains('collapsed') : !!force;
  sidebarEl.classList.toggle('collapsed', willCollapse);
  if (willCollapse) {
    sidebarToggleBtn.textContent = '»';
    sidebarToggleBtn.title = '展开侧边栏';
    sidebarToggleBtn.dataset.state = 'collapsed';
  } else {
    sidebarToggleBtn.textContent = '«';
    sidebarToggleBtn.title = '折叠侧边栏';
    sidebarToggleBtn.dataset.state = 'expanded';
  }
  try { localStorage.setItem('genesis_sidebar_collapsed', willCollapse ? '1' : '0'); } catch (e) { /* 忽略 */ }
}

// ---------- 空态/欢迎渲染 ----------
function insertPrompt(text: string): void {
  inputEl.value = text;
  inputEl.focus();
  try { inputEl.setSelectionRange(text.length, text.length); } catch (e) { /* 忽略 */ }
  autoGrowInput();
  updateSendState();
}

function renderEmptyOrWelcome(): void {
  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<HTMLElement>('.suggest-card').forEach((b) => {
    b.onclick = () => insertPrompt(b.dataset.prompt || '');
  });
}

// ---------- 会话「⋯」菜单 + 重命名 ----------
interface SessMenuTarget { sid: string; name: string; el: HTMLElement; }
let sessMenuTarget: SessMenuTarget | null = null;
function openSessMenu(ev: MouseEvent, sidVal: string, name: string, el: HTMLElement): void {
  ev.stopPropagation();
  sessMenuTarget = { sid: sidVal, name, el };
  sessMenuEl.hidden = false;
  const r = (ev.currentTarget as HTMLElement).getBoundingClientRect();
  sessMenuEl.style.top = (r.bottom + 4) + 'px';
  sessMenuEl.style.left = Math.max(8, r.right - 150) + 'px';
}
function closeSessMenu(): void {
  sessMenuEl.hidden = true;
}
function startRenameSession(el: HTMLElement, s: { session_id: string; name: string }): void {
  const nameEl = el.querySelector<HTMLElement>('.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: boolean): Promise<void> => {
    if (done) return; done = true;
    const newName = input.value.trim();
    if (save && newName && newName !== (s.name || '')) {
      try {
        const r = await api<RenameResp>('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: KeyboardEvent) => {
    if (e.key === 'Enter') { e.preventDefault(); void finish(true); }
    else if (e.key === 'Escape') { e.preventDefault(); void finish(false); }
  });
  input.addEventListener('blur', () => { void finish(true); });
}

// ---------- 会话创建/加载 ----------
async function newSession(): Promise<void> {
  if (progressWs) { try { progressWs.close(); } catch (e) { /* 忽略 */ } } progressWs = null;
  sid = null;
  activeProject = null;
  try { localStorage.removeItem('genesis_session'); } catch (e) { /* 忽略 */ }
  chatEl.innerHTML = '';
  setText(sessionTitle, '未创建会话');
  await refreshSessions();
  renderEmptyOrWelcome();
}

async function loadSession(id: string): Promise<void> {
  try {
    const rec = await api<SessionRecord>('GET', '/api/sessions/' + encodeURIComponent(id));
    sid = id;
    activeProject = rec.project || null;
    applyProjectContext();
    setText(sessionTitle, (rec.name || '新会话'));
    if (progressWs) { try { progressWs.close(); } catch (e) { /* 忽略 */ } }
    progressWs = GenesisWS.connectProgressWs(id, {
      onProgress: (e) => GenesisWS.applyProgressEvent(e, (role, text) => addMsg(role, text)),
      onClose: () => { /* noop */ },
    });
    const msgs = await api<ChatMessage[]>('GET', '/api/chat/' + encodeURIComponent(id) + '/messages');
    chatEl.innerHTML = '';
    for (const m of msgs) {
      const roleMap: Record<string, string> = { user: 'user', progress: 'progress', error: 'error' };
      const role = roleMap[m.role] || 'assistant';
      if (role === 'user') {
        let att: AttachmentRef | null = null;
        if (m.attachment) { try { att = JSON.parse(m.attachment) as AttachmentRef; } catch (e) { att = null; } }
        addUserMsg(m.content, att);
      } else {
        addMsg(role, esc(m.content));
      }
    }
    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)));
  }
}

function renderProjectMismatchHint(): void {
  const old = document.getElementById('proj-mismatch-hint');
  if (old) old.remove();
  if (!sid) return;
  if (!activeProject) return;
  if (activeProject === draftProject) return;
  let skipped: Record<string, string> = {};
  try { skipped = JSON.parse(sessionStorage.getItem('genesis_skipped_project_hint') || '{}') as Record<string, string>; } 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);
  const switchEl = wrap.querySelector<HTMLElement>('[data-act="switch"]');
  if (switchEl) switchEl.onclick = (e: MouseEvent) => {
    e.preventDefault();
    draftProject = activeProject;
    applyProjectContext();
    renderProjectSwitcher();
    void refreshSessions();
    wrap.remove();
  };
  const keepEl = wrap.querySelector<HTMLElement>('[data-act="keep"]');
  if (keepEl) keepEl.onclick = (e: MouseEvent) => {
    e.preventDefault();
    try {
      skipped[sid as string] = activeProject as string;
      sessionStorage.setItem('genesis_skipped_project_hint', JSON.stringify(skipped));
    } catch (er) { /* 忽略 */ }
    wrap.remove();
  };
}

// ---------- 发送 ----------
let sendInFlight = false;
function updateSendState(): void { sendBtn.disabled = sendInFlight || inputEl.value.trim() === ''; }
async function send(): Promise<void> {
  if (sendInFlight) return;
  const text = inputEl.value.trim();
  if (!text) return;
  sendInFlight = true;
  updateSendState();
  if (!sid) {
    try {
      const d = await api<SessionCreated>('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)));
      sendInFlight = false;
      updateSendState();
      return;
    }
  }
  const sessionId = sid as string;
  // 待发附件：先上传（失败则中止并保留待发附件）
  let attachmentRef: AttachmentRef | null = null;
  if (pendingAttachment) {
    const f = pendingAttachment;
    const fd = new FormData();
    fd.append('file_type', 'requirements');
    fd.append('file', f.file);
    setText(uploadStatusEl, '上传中…');
    try {
      const r = await fetch('/api/sessions/' + encodeURIComponent(sessionId) + '/files', { method: 'POST', body: fd });
      const d = (await r.json().catch(() => ({}))) as UploadResp & { detail?: { message?: string } };
      if (!r.ok) throw new Error((d && d.detail && d.detail.message) || String(r.status));
      setText(uploadStatusEl, '');
      const rec = await api<SessionRecord>('GET', '/api/sessions/' + encodeURIComponent(sessionId));
      activeProject = rec.project || null;
      setText(sessionTitle, (rec.name || '新会话'));
      await refreshSessions();
      attachmentRef = { file_type: 'requirements', name: d.file_name };
      pendingAttachment = null;
      renderPendingAttachment();
    } catch (e) {
      setText(uploadStatusEl, '');
      addMsg('error', '附件上传失败：' + esc(String(e)));
      sendInFlight = false;
      updateSendState();
      return;
    }
  }
  if (progressWs) { try { progressWs.close(); } catch (e) { /* 忽略 */ } }
  progressWs = GenesisWS.connectProgressWs(sessionId, {
    onProgress: (e) => GenesisWS.applyProgressEvent(e, (role, text2) => addMsg(role, text2)),
    onClose: () => { /* noop */ },
  });
  inputEl.value = '';
  inputEl.style.height = '';
  const es = chatEl.querySelector('.empty-state');
  if (es) es.remove();
  addUserMsg(text, attachmentRef);
  const typing = showTyping();
  const msgBody: { content: string; attachment?: AttachmentRef } = { content: text };
  if (attachmentRef) msgBody.attachment = attachmentRef;
  try {
    const res = await api<ChatReply>('POST', '/api/chat/' + encodeURIComponent(sessionId) + '/messages', msgBody);
    typing.remove();
    if (res.progress && res.progress.length) {
      const items = res.progress.map((p: ProgressItem) => '<span class="progress-item ' + (p.status || 'ok') + '">' + esc(p.step) + ': ' + esc(p.detail || '') + '</span>').join('');
      addMsg('progress', items);
    }
    let replyHtml = esc(res.reply || '');
    const st = res.status;
    if (st === 'done' || st === 'writing') {
      replyHtml += '<div class="actions">'
        + '<a href="/api/sessions/' + sessionId + '/result/download">下载 docx</a>'
        + '<a href="/api/sessions/' + sessionId + '/result/preview">预览</a>'
        + '<a href="/api/sessions/' + sessionId + '/result/impact-report">影响调查书</a>'
        + '<a href="/api/sessions/' + sessionId + '/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;
    updateSendState();
    inputEl.focus();
  }
}

document.getElementById('send')!.addEventListener('click', () => { void send(); });
inputEl.addEventListener('keydown', (e: KeyboardEvent) => {
  if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); void send(); }
});
inputEl.addEventListener('input', () => { autoGrowInput(); updateSendState(); });
updateSendState();
document.getElementById('new-chat')!.addEventListener('click', () => { void newSession().catch((e) => addMsg('error', esc(String(e)))); });
sidebarToggleBtn.addEventListener('click', () => toggleSidebar());
document.getElementById('ps-current')!.addEventListener('click', (e) => {
  e.stopPropagation();
  lastTriggerEl = e.currentTarget as HTMLElement;
  toggleProjectSwitcher();
});
document.getElementById('drawer-close')!.addEventListener('click', closeProjectDrawer);
drawerMask.addEventListener('click', closeProjectDrawer);
document.getElementById('pf-save')!.addEventListener('click', () => { void saveDrawerProject(); });
document.getElementById('pf-delete')!.addEventListener('click', () => { void deleteDrawerProject(); });
document.getElementById('side-add-project')!.addEventListener('click', () => {
  if (!guardDrawerDirty()) return;
  openProjectDrawer(null);
});
document.getElementById('tb-upload')!.addEventListener('click', () => { fileInputEl.click(); });
fileInputEl.addEventListener('change', () => {
  const file = fileInputEl.files && fileInputEl.files[0];
  fileInputEl.value = '';
  if (!file) return;
  if (pickExt(file.name) !== '.xlsx') {
    addMsg('error', '要件定义书须为 .xlsx 文件（当前：' + esc(file.name) + '）');
    return;
  }
  pendingAttachment = { file, name: file.name };
  renderPendingAttachment();
});
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 });
});

document.addEventListener('click', (e: MouseEvent) => {
  const target = e.target as Node;
  if (projSwitcherEl && !projSwitcherEl.contains(target)) toggleProjectSwitcher(false);
  if (!sessMenuEl.hidden && !sessMenuEl.contains(target)) closeSessMenu();
});
document.addEventListener('keydown', (e: KeyboardEvent) => {
  if (e.key === 'Escape') {
    closeSessMenu();
    if (psMenu.classList.contains('open')) toggleProjectSwitcher(false);
    else if (drawerOpen) closeProjectDrawer();
    if (lastTriggerEl) { lastTriggerEl.focus(); lastTriggerEl = null; }
  }
});

// 取扩展名（小写，含点）
function pickExt(name: string): string {
  const i = String(name).lastIndexOf('.');
  return i >= 0 ? String(name).slice(i).toLowerCase() : '';
}

// 在线查看附件：前端用 SheetJS 解析原 xlsx 渲染（多 sheet）
async function openAttachmentViewer(fileType: string, name: string): Promise<void> {
  if (!sid) { addMsg('error', '请先创建会话'); return; }
  try {
    const r = await fetch('/api/sessions/' + encodeURIComponent(sid) + '/files/' + encodeURIComponent(fileType));
    if (!r.ok) throw new Error(String(r.status));
    const buf = await r.arrayBuffer();
    const wb = XLSX.read(new Uint8Array(buf), { type: 'array' });
    showWorkbookViewer(name, wb);
  } catch (e) {
    addMsg('error', '附件查看失败：' + esc(String(e)));
  }
}

function showWorkbookViewer(name: string, wb: XLSX.WorkBook): void {
  const old = document.getElementById('attach-viewer');
  if (old) old.remove();
  const overlay = document.createElement('div');
  overlay.id = 'attach-viewer';
  overlay.className = 'viewer-overlay';
  const names = wb.SheetNames;
  const tabs = names.map((n, i) => '<button class="vt-tab' + (i === 0 ? ' active' : '') + '" type="button" data-i="' + i + '">' + esc(n) + '</button>').join('');
  overlay.innerHTML =
    '<div class="viewer-panel">' +
      '<div class="viewer-head"><span class="viewer-title">📄 ' + esc(name) + '</span>' +
      '<button class="viewer-close" type="button" title="关闭" aria-label="关闭">×</button></div>' +
      '<div class="viewer-tabs">' + tabs + '</div>' +
      '<div class="viewer-body"></div>' +
    '</div>';
  document.body.appendChild(overlay);
  const vbody = overlay.querySelector<HTMLElement>('.viewer-body');
  const renderSheet = (i: number): void => {
    if (!vbody) return;
    const ws = wb.Sheets[names[i]];
    vbody.innerHTML = ws ? XLSX.utils.sheet_to_html(ws) : '';
  };
  renderSheet(0);
  overlay.querySelectorAll<HTMLElement>('.vt-tab').forEach((el) => {
    el.onclick = () => {
      overlay.querySelectorAll('.vt-tab').forEach((x) => x.classList.remove('active'));
      el.classList.add('active');
      renderSheet(Number(el.dataset.i || 0));
    };
  });
  const close = (): void => overlay.remove();
  const closeBtn = overlay.querySelector<HTMLElement>('.viewer-close');
  if (closeBtn) closeBtn.onclick = close;
  overlay.addEventListener('click', (e: MouseEvent) => { if (e.target === overlay) close(); });
}

// ---------- 启动：恢复侧边栏折叠态、上次会话 ----------
void (async () => {
  try {
    const collapsed = localStorage.getItem('genesis_sidebar_collapsed') === '1';
    if (collapsed) sidebarEl.classList.add('collapsed');
  } catch (e) { /* 忽略 */ }
  await loadProjects();
  const saved = (() => { try { return localStorage.getItem('genesis_session'); } catch (e) { return null; } })();
  if (saved) {
    addMsg('assistant', '正在恢复上次会话…');
    try {
      await loadSession(saved);
      const rec = await api<SessionRecord>('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 */ }
        if (draftProject === recProj) {
          draftProject = (projects.length > 0) ? projects[0].name : null;
          applyProjectContext();
        }
      }
      return;
    } catch (e) { /* 忽略，新建 */ }
  }
  void newSession().catch((e) => addMsg('error', esc(String(e))));
})();