#!/usr/bin/env node
/**
 * todo/todo.mjs — 项目 TODO 管理 CLI（零依赖，Node.js >= 18）
 *
 * 状态流转：open → doing → done → accepted
 *              done ←─ reject（退回，升为最高优先级）
 *   open     待开始   Claude 可设
 *   doing    开发中   Claude 可设
 *   done     待验收   Claude 可设（开发完成，等用户确认）
 *   accepted 已验收   仅限用户设置（手动编辑 JSON 或 `done <id>` 命令）
 *
 * 子命令：
 *   add    --title "..." [--level high|mid|low] [--tier 1|2|3] [--tags a,b] [--desc "..."]
 *   status <id> <open|doing|done>        — 更新开发状态（Claude 可调用）
 *   done   <id> [--version vX.Y.Z]      — 标记已验收交付（仅用户调用）
 *   reject <id> --reason "原因"          — 拒绝验收，退回 open 并升为 high（仅用户调用）
 *   reopen <id>                          — 重新开启（清空拒绝记录）
 *   rm     <id>
 *   list
 *   render
 *   sub add    <parent_id> --title "..." [--tier 1|2|3] [--deps "21A,21B"]
 *   sub status <sid> <open|doing|done>   — 更新子任务状态（如 21A）
 */

import { readFileSync, writeFileSync, existsSync } from 'node:fs';
import { resolve, dirname } from 'node:path';
import { execSync } from 'node:child_process';
import { fileURLToPath } from 'node:url';

const __dir  = dirname(fileURLToPath(import.meta.url));
const DB     = resolve(__dir, 'todo.json');
const HTML   = resolve(__dir, 'todo.html');

// ─── 常量 ────────────────────────────────────────────────────────────────────

const LEVEL_LABEL = { high: '高', mid: '中', low: '低' };
const LEVEL_ORDER = { high: 0, mid: 1, low: 2 };

const STATUS_LABEL = { open: '待开始', doing: '开发中', done: '待验收', accepted: '已验收' };
const STATUS_ORDER = { open: 0, doing: 1, done: 2, accepted: 3 };

const TIER_LABEL = { 1: '一级', 2: '二级', 3: '三级' };

const SUB_STATUS_ICON  = { open: '○', doing: '◐', done: '✓' };
const SUB_LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

// ─── 数据读写 ────────────────────────────────────────────────────────────────

function load() {
  if (!existsSync(DB)) {
    return { meta: { title: '酒库管理系统 — 项目 TODO', updated_at: now() }, seq: 0, items: [] };
  }
  const db = JSON.parse(readFileSync(DB, 'utf8'));
  for (const item of db.items) {
    if (!item.status) {
      item.status = item.done ? 'accepted' : 'open';
    }
  }
  return db;
}

function save(db) {
  db.meta.updated_at = now();
  writeFileSync(DB, JSON.stringify(db, null, 2) + '\n', 'utf8');
}

function now() {
  return new Date().toISOString();
}

function fmtDate(iso) {
  if (!iso) return '';
  const d = new Date(iso);
  return `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`;
}

function gitTag() {
  try {
    return execSync('git describe --tags --abbrev=0', { encoding: 'utf8', stdio: ['ignore','pipe','ignore'] }).trim();
  } catch {
    return null;
  }
}

// ─── 子任务工具 ──────────────────────────────────────────────────────────────

function nextSubtaskLetter(item) {
  const existing = (item.subtasks || []).map(s => s.sid);
  for (const l of SUB_LETTERS) {
    const sid = `${item.id}${l}`;
    if (!existing.includes(sid)) return l;
  }
  return null;
}

function parseSid(sid) {
  const m = String(sid).match(/^(\d+)([A-Za-z])$/);
  if (!m) return null;
  return { parentId: parseInt(m[1], 10), letter: m[2].toUpperCase() };
}

function findSubtask(db, sid) {
  const parsed = parseSid(sid);
  if (!parsed) { console.error(`错误：无效子任务 ID "${sid}"，格式应为 21A`); process.exit(1); }
  const parent = db.items.find(i => i.id === parsed.parentId);
  if (!parent) { console.error(`错误：找不到父任务 id=${parsed.parentId}`); process.exit(1); }
  const normalSid = sid.toUpperCase();
  const sub = (parent.subtasks||[]).find(s => s.sid === normalSid);
  if (!sub) { console.error(`错误：找不到子任务 ${normalSid}`); process.exit(1); }
  return { parent, sub };
}

function subtasksDoneCount(item) {
  if (!item.subtasks || !item.subtasks.length) return { done: 0, total: 0 };
  const done = item.subtasks.filter(s => s.status === 'done' || s.status === 'accepted').length;
  return { done, total: item.subtasks.length };
}

function allSubtasksDone(item) {
  const { done, total } = subtasksDoneCount(item);
  return total > 0 && done === total;
}

// ─── 终端 summary ────────────────────────────────────────────────────────────

function levelText(level) {
  return { high: '高优 · 紧急', mid: '重要', low: '一般 / 优化' }[level] || level;
}

function printSummary(db) {
  const byStatus = { open: [], doing: [], done: [], accepted: [] };
  for (const i of db.items) {
    (byStatus[i.status] || byStatus.open).push(i);
  }
  for (const st of ['open','doing','done','accepted']) {
    byStatus[st].sort((a,b) => (LEVEL_ORDER[a.level]??9) - (LEVEL_ORDER[b.level]??9) || a.id - b.id);
  }

  const total    = db.items.length;
  const pending  = byStatus.open.length + byStatus.doing.length + byStatus.done.length;
  const accepted = byStatus.accepted.length;

  console.log(`\nTODO  共 ${total} · 进行中 ${pending} · 已验收 ${accepted}`);

  for (const [st, label] of [['open','待开始'],['doing','开发中'],['done','待验收']]) {
    if (byStatus[st].length === 0) continue;
    console.log(`${label}（${byStatus[st].length}）：`);
    for (const i of byStatus[st]) {
      const tags    = i.tags && i.tags.length ? '  ' + i.tags.join('/') : '';
      const lvl     = LEVEL_LABEL[i.level] || i.level;
      const tier    = i.tier ? '·' + TIER_LABEL[i.tier] : '';
      const { done, total: stTotal } = subtasksDoneCount(i);
      const subInfo = stTotal > 0 ? `  [${done}/${stTotal}子任务]` : '';
      console.log(`  [${lvl}${tier}] #${i.id} ${i.title}${tags}${subInfo}`);
      if (stTotal > 0) {
        for (const s of i.subtasks) {
          const icon = SUB_STATUS_ICON[s.status] || '○';
          const deps = s.deps && s.deps.length ? ` (需: ${s.deps.join(',')})` : '';
          const stier = s.tier ? ` [${TIER_LABEL[s.tier]}]` : '';
          console.log(`      ${icon} ${s.sid}${stier} ${s.title}${deps}`);
        }
      }
    }
  }

  if (byStatus.accepted.length) {
    console.log(`已验收（最近 5 条）：`);
    for (const i of byStatus.accepted.slice(0, 5)) {
      const ver = i.version ? `（${i.version}）` : '';
      console.log(`  ✅ #${i.id} ${i.title}${ver}`);
    }
  }
  console.log('');
}

// ─── HTML 渲染 ───────────────────────────────────────────────────────────────

function esc(s) {
  return String(s ?? '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
}

function renderDesc(s) {
  if (!s) return '';
  return esc(s).replace(/`([^`]+)`/g, '<code>$1</code>');
}

function levelClass(level) {
  return { high: 't-block', mid: 't-high', low: 't-low' }[level] || 't-low';
}

function statusClass(status) {
  return { open: 's-open', doing: 's-doing', done: 's-done', accepted: 's-accepted' }[status] || 's-open';
}

function renderSubtasks(item) {
  if (!item.subtasks || item.subtasks.length === 0) return '';
  const { done, total } = subtasksDoneCount(item);
  const pct = total > 0 ? Math.round(done / total * 100) : 0;

  const subItems = item.subtasks.map(s => {
    const stCls  = statusClass(s.status);
    const stLbl  = STATUS_LABEL[s.status] || s.status;
    const icon   = SUB_STATUS_ICON[s.status] || '○';
    const tierBadge = s.tier ? `<span class="tag tier-${s.tier}">${TIER_LABEL[s.tier]}</span>` : '';
    const depBadges = (s.deps||[]).map(dep => {
      const depSub  = item.subtasks.find(x => x.sid === dep);
      const depDone = depSub && (depSub.status === 'done' || depSub.status === 'accepted');
      return `<span class="dep-badge ${depDone ? 'dep-done' : 'dep-pending'}" title="${dep} ${depDone ? '已完成' : '未完成'}">${esc(dep)}</span>`;
    }).join('');
    const depsHtml = s.deps && s.deps.length
      ? `<span class="dep-section"><span class="dep-label">依赖:</span>${depBadges}</span>`
      : '';

    return `<li class="subtask-item ${stCls}" data-sid="${esc(s.sid)}">
      <span class="sub-icon ${stCls}">${icon}</span>
      <span class="sub-sid">${esc(s.sid)}</span>
      <span class="sub-title">${esc(s.title)}</span>
      <div class="sub-badges">${tierBadge}<span class="tag status-badge ${stCls}">${stLbl}</span>${depsHtml}</div>
    </li>`;
  }).join('\n');

  return `<div class="subtask-block">
    <div class="subtask-header">
      <span class="subtask-label">子任务</span>
      <span class="subtask-progress-text">${done} / ${total} 完成</span>
      <div class="subtask-progress-bar"><div class="subtask-progress-fill" style="width:${pct}%"></div></div>
    </div>
    <ul class="subtask-list">${subItems}</ul>
  </div>`;
}

function renderItems(items) {
  if (!items.length) return '<p class="empty-tip">暂无条目</p>';
  return items.map(i => {
    const tags    = (i.tags||[]).map(t => `<span class="tag t-tag" data-tag="${esc(t)}">${esc(t)}</span>`).join(' ');
    const desc    = i.desc ? `<div class="item-desc">${renderDesc(i.desc)}</div>` : '';
    const stCls   = statusClass(i.status);
    const stLbl   = STATUS_LABEL[i.status] || i.status;
    const rejectNote = i.reject_reason
      ? `<div class="reject-note">🚫 拒绝原因：${esc(i.reject_reason)}<span class="reject-date"> · ${fmtDate(i.rejected_at)}</span></div>`
      : '';
    const rejectBtn = i.status === 'done'
      ? `<button class="reject-btn" data-id="${i.id}" data-title="${esc(i.title)}">拒绝验收</button>`
      : '';
    const { done: subDone, total: subTotal } = subtasksDoneCount(i);
    const subProgressBadge = subTotal > 0
      ? `<span class="tag sub-progress-badge">${subDone}/${subTotal} 子任务</span>`
      : '';
    const meta    = `<div class="item-meta">
      <span class="meta-date">🕐 ${fmtDate(i.created_at)}</span>
      ${i.status === 'accepted' ? `<span class="meta-date">✅ 验收 ${fmtDate(i.completed_at)}${i.version ? ' · <span class="ver-badge">'+esc(i.version)+'</span>' : ''}</span>` : ''}
    </div>`;
    const lvlCls  = levelClass(i.level);
    const subtasksBlock = renderSubtasks(i);
    return `
    <li class="todo-card ${stCls}"
        data-id="${i.id}"
        data-level="${esc(i.level)}"
        data-status="${esc(i.status)}"
        data-tier="${esc(i.tier ?? '')}"
        data-tags="${esc((i.tags||[]).join(','))}">
      <div class="card-header">
        <span class="item-title">${esc(i.title)}</span>
        <div class="card-badges">
          <span class="tag status-badge ${stCls}">${stLbl}</span>
          <span class="tag ${lvlCls}">${levelText(i.level)}</span>
          ${i.tier ? `<span class="tag tier-${i.tier}">${TIER_LABEL[i.tier]}</span>` : ''}
          ${subProgressBadge}
          ${rejectBtn}
        </div>
      </div>
      ${rejectNote}
      ${desc}
      ${subtasksBlock}
      <div class="card-footer">
        <div class="tag-row">${tags}</div>
        ${meta}
      </div>
    </li>`;
  }).join('\n');
}

function buildHtml(db) {
  const allTags = [...new Set(db.items.flatMap(i => i.tags||[]))].sort();

  const byStatus = { open: [], doing: [], done: [], accepted: [] };
  for (const i of db.items) {
    (byStatus[i.status] || byStatus.open).push(i);
  }
  const sortFn = (a,b) => (LEVEL_ORDER[a.level]??9) - (LEVEL_ORDER[b.level]??9) || a.id - b.id;
  for (const st of Object.keys(byStatus)) byStatus[st].sort(sortFn);
  byStatus.accepted.sort((a,b) => (b.completed_at||'') > (a.completed_at||'') ? 1 : -1);

  const total   = db.items.length;
  const pending = byStatus.open.length + byStatus.doing.length + byStatus.done.length;

  const tagChips = allTags.map(t =>
    `<button class="filter-chip" data-filter-tag="${esc(t)}">${esc(t)}</button>`
  ).join('');

  return `<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>${esc(db.meta.title)}</title>
<style>
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 0 80px;
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1f2933; background: #f7f9fb; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
header {
  background: linear-gradient(135deg, #0A1F3B 0%, #15407D 100%);
  color: #fff; padding: 36px 32px 28px;
}
header h1 { margin: 0 0 6px; font-size: 24px; font-weight: 700; }
header .header-meta { color: #ADC9EA; font-size: 13px; margin-top: 4px; }
.stats { display: flex; gap: 16px; margin-top: 14px; flex-wrap: wrap; }
.stat-pill {
  background: rgba(255,255,255,0.12); border-radius: 20px;
  padding: 4px 14px; font-size: 13px; color: #fff;
}
.stat-pill strong { font-size: 18px; font-weight: 700; margin-right: 2px; }

/* ── 筛选栏 ── */
.filter-bar {
  position: sticky; top: 0; z-index: 10;
  background: #fff; border-bottom: 1px solid #e4e9ef;
  padding: 10px 28px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
.filter-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.filter-label { font-size: 12px; color: #7b8794; white-space: nowrap; }
.filter-chip, .filter-btn {
  padding: 3px 12px; border-radius: 14px; border: 1.5px solid #d1d9e6;
  background: #f7f9fb; color: #52606d; font-size: 12.5px; cursor: pointer;
  transition: all .15s; white-space: nowrap;
}
.filter-chip:hover, .filter-btn:hover { border-color: #2563AC; color: #2563AC; }
.filter-chip.active, .filter-btn.active {
  background: #2563AC; border-color: #2563AC; color: #fff;
}
.filter-sep { width: 1px; height: 20px; background: #e4e9ef; margin: 0 4px; }

/* ── 内容区 ── */
.wrap { max-width: 980px; margin: 0 auto; padding: 0 24px; }
.section-block { margin-bottom: 8px; }
.section-title {
  font-size: 15px; font-weight: 700;
  padding: 10px 14px; border-radius: 8px;
  display: flex; align-items: center; gap: 8px; cursor: pointer;
  margin: 20px 0 8px; user-select: none;
}
.section-title .s-count {
  font-size: 12px; font-weight: 500; padding: 1px 8px; border-radius: 10px;
  background: rgba(0,0,0,0.08);
}
.section-title .s-arrow { margin-left: auto; font-size: 12px; color: inherit; opacity: .6; }

/* 状态主题色 */
.st-open    { background: #eff6ff; color: #1e40af; border-left: 4px solid #3b82f6; }
.st-doing   { background: #fff7ed; color: #9a3412; border-left: 4px solid #f97316; }
.st-done    { background: #fefce8; color: #854d0e; border-left: 4px solid #eab308; }
.st-accepted{ background: #f0fdf4; color: #166534; border-left: 4px solid #22c55e; }

ul.todo-list { list-style: none; margin: 0; padding: 0; }
.todo-card {
  background: #fff; border: 1px solid #e4e9ef; border-radius: 10px;
  padding: 14px 18px; margin-bottom: 10px;
  border-left-width: 4px;
}
.todo-card.s-open     { border-left-color: #3b82f6; }
.todo-card.s-doing    { border-left-color: #f97316; }
.todo-card.s-done     { border-left-color: #eab308; }
.todo-card.s-accepted { border-left-color: #22c55e; background: #f0fdf4; opacity: .8; }

.card-header { display: flex; align-items: flex-start; gap: 10px; flex-wrap: wrap; }
.item-title { font-weight: 600; font-size: 15px; flex: 1; }
.todo-card.s-accepted .item-title { text-decoration: line-through; color: #52606d; }
.card-badges { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.item-desc { font-size: 13.5px; color: #52606d; margin-top: 6px; }
.item-desc code {
  background: #f0f2f5; padding: 1px 5px; border-radius: 3px;
  font-family: "JetBrains Mono", monospace; font-size: 12.5px; color: #b91c1c;
}
.card-footer { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.item-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 12px; color: #8aa3c4; }
.meta-date { white-space: nowrap; }

/* ── 标签样式 ── */
.tag { display: inline-block; padding: 2px 9px; border-radius: 10px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.t-block { background: #fde8e8; color: #b91c1c; }
.t-high  { background: #fef0d8; color: #9a6700; }
.t-low   { background: #e6f0fb; color: #1d4ed8; }
.t-tag   { background: #efefef; color: #555; cursor: pointer; transition: .12s; }
.t-tag:hover { background: #d9e8fb; color: #1d4ed8; }
.ver-badge { font-weight: 700; color: #1f7a44; }
.sub-progress-badge { background: #f0f4ff; color: #3730a3; }

/* 状态徽章 */
.status-badge { font-size: 11.5px; }
.s-open     { background: #dbeafe; color: #1e40af; }
.s-doing    { background: #ffedd5; color: #9a3412; }
.s-done     { background: #fef9c3; color: #854d0e; }
.s-accepted { background: #dcfce7; color: #166534; }

/* ── 折叠 ── */
.section-list-wrap.collapsed { display: none; }
.empty-tip { font-size: 14px; color: #8aa3c4; margin: 8px 0 24px; }
.hidden { display: none !important; }

/* ── 改动等级徽章 ── */
.tier-1 { background: #ede9fe; color: #6d28d9; }
.tier-2 { background: #ccfbf1; color: #0f766e; }
.tier-3 { background: #f1f5f9; color: #475569; }

/* ── 拒绝按钮 & 拒绝原因 ── */
.reject-btn {
  padding: 3px 10px; border-radius: 6px; border: 1.5px solid #dc2626;
  background: #fff; color: #dc2626; font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all .15s; white-space: nowrap;
}
.reject-btn:hover { background: #dc2626; color: #fff; }
.reject-note {
  margin: 8px 0 4px; padding: 7px 12px; border-radius: 6px;
  background: #fef2f2; border: 1px solid #fecaca;
  font-size: 13px; color: #b91c1c; line-height: 1.5;
}
.reject-date { color: #ef9999; font-size: 12px; }

/* ── 子任务区 ── */
.subtask-block {
  margin-top: 12px; padding: 10px 14px;
  background: #f8fafc; border: 1px solid #e4e9ef; border-radius: 8px;
}
.subtask-header {
  display: flex; align-items: center; gap: 8px; margin-bottom: 8px; flex-wrap: wrap;
}
.subtask-label {
  font-size: 11px; font-weight: 700; color: #7b8794;
  text-transform: uppercase; letter-spacing: .6px;
}
.subtask-progress-text { font-size: 12px; color: #52606d; }
.subtask-progress-bar {
  flex: 1; height: 5px; background: #e4e9ef; border-radius: 3px; min-width: 60px;
}
.subtask-progress-fill { height: 100%; background: #22c55e; border-radius: 3px; transition: width .4s; }
.subtask-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 5px; }
.subtask-item {
  display: flex; align-items: center; gap: 7px; flex-wrap: wrap;
  padding: 6px 10px; border-radius: 6px; font-size: 13px;
  background: #fff; border: 1px solid #e8edf2;
}
.subtask-item.s-done     { background: #f0fdf4; border-color: #bbf7d0; }
.subtask-item.s-doing    { background: #fff7ed; border-color: #fed7aa; }
.subtask-item.s-accepted { background: #f0fdf4; border-color: #bbf7d0; opacity: .75; }
.sub-icon {
  width: 16px; text-align: center; font-size: 13px; font-weight: 700; flex-shrink: 0;
}
.sub-icon.s-done     { color: #16a34a; }
.sub-icon.s-doing    { color: #ea580c; }
.sub-icon.s-open     { color: #93aec8; }
.sub-icon.s-accepted { color: #16a34a; }
.sub-sid {
  font-family: "JetBrains Mono", monospace; font-size: 11.5px;
  color: #52606d; font-weight: 700; min-width: 32px; flex-shrink: 0;
}
.sub-title { flex: 1; font-size: 13px; min-width: 120px; }
.subtask-item.s-done .sub-title,
.subtask-item.s-accepted .sub-title { text-decoration: line-through; color: #52606d; }
.sub-badges { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.dep-section { display: flex; align-items: center; gap: 3px; }
.dep-label { font-size: 11px; color: #8aa3c4; margin-right: 2px; }
.dep-badge {
  padding: 1px 6px; border-radius: 8px; font-size: 11px;
  font-weight: 700; font-family: monospace; cursor: default;
}
.dep-done    { background: #dcfce7; color: #166534; }
.dep-pending { background: #fee2e2; color: #b91c1c; }

/* ── 拒绝 Modal ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center; z-index: 999;
}
.modal-box {
  background: #fff; border-radius: 12px; padding: 28px 32px;
  width: min(480px, 94vw); box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.modal-box h3 { margin: 0 0 4px; font-size: 17px; color: #1f2933; }
.modal-subtitle { font-size: 13px; color: #52606d; margin: 0 0 18px; }
.modal-label { font-size: 13px; font-weight: 600; color: #374151; margin-bottom: 6px; display: block; }
.modal-label .req { color: #dc2626; margin-left: 2px; }
.modal-textarea {
  width: 100%; border: 1.5px solid #d1d9e6; border-radius: 8px;
  padding: 10px 12px; font-size: 14px; font-family: inherit; resize: vertical;
  min-height: 88px; outline: none; transition: border-color .15s;
}
.modal-textarea:focus { border-color: #dc2626; }
.modal-textarea.error { border-color: #dc2626; background: #fff8f8; }
.modal-err { font-size: 12px; color: #dc2626; margin-top: 4px; display: none; }
.modal-err.show { display: block; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.modal-btn { padding: 8px 20px; border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; border: none; transition: all .15s; }
.modal-btn-cancel { background: #f3f4f6; color: #374151; }
.modal-btn-cancel:hover { background: #e5e7eb; }
.modal-btn-reject { background: #dc2626; color: #fff; }
.modal-btn-reject:hover { background: #b91c1c; }
.modal-cmd-wrap { margin-top: 16px; padding: 12px 14px; background: #1e293b; border-radius: 8px; }
.modal-cmd-label { font-size: 12px; color: #94a3b8; margin-bottom: 8px; }
.modal-cmd-code { font-family: "JetBrains Mono", "Fira Code", monospace; font-size: 13px; color: #86efac; word-break: break-all; display: block; }
.modal-copy-btn { margin-top: 10px; padding: 5px 14px; border-radius: 6px; background: #334155; color: #e2e8f0; border: none; font-size: 12px; cursor: pointer; }
.modal-copy-btn:hover { background: #475569; }
</style>
</head>
<body>

<header>
  <div class="wrap">
    <h1>${esc(db.meta.title)}</h1>
    <div class="header-meta">生成于 ${fmtDate(db.meta.updated_at)} · 真相源 todo/todo.json</div>
    <div class="stats">
      <div class="stat-pill"><strong>${total}</strong>全部</div>
      <div class="stat-pill"><strong>${byStatus.open.length}</strong>待开始</div>
      <div class="stat-pill"><strong>${byStatus.doing.length}</strong>开发中</div>
      <div class="stat-pill"><strong>${byStatus.done.length}</strong>待验收</div>
      <div class="stat-pill"><strong>${byStatus.accepted.length}</strong>已验收</div>
    </div>
  </div>
</header>

<div class="filter-bar" id="filterBar">
  <div class="filter-group">
    <span class="filter-label">重要度</span>
    <button class="filter-btn active" data-filter-level="all">全部</button>
    <button class="filter-btn" data-filter-level="high">高优</button>
    <button class="filter-btn" data-filter-level="mid">重要</button>
    <button class="filter-btn" data-filter-level="low">一般</button>
  </div>
  <div class="filter-sep"></div>
  <div class="filter-group">
    <span class="filter-label">状态</span>
    <button class="filter-btn active" data-filter-status="all">全部</button>
    <button class="filter-btn" data-filter-status="open">待开始</button>
    <button class="filter-btn" data-filter-status="doing">开发中</button>
    <button class="filter-btn" data-filter-status="done">待验收</button>
    <button class="filter-btn" data-filter-status="accepted">已验收</button>
  </div>
  <div class="filter-sep"></div>
  <div class="filter-group">
    <span class="filter-label">改动等级</span>
    <button class="filter-btn active" data-filter-tier="all">全部</button>
    <button class="filter-btn" data-filter-tier="1">一级</button>
    <button class="filter-btn" data-filter-tier="2">二级</button>
    <button class="filter-btn" data-filter-tier="3">三级</button>
  </div>
  ${allTags.length ? `<div class="filter-sep"></div>
  <div class="filter-group">
    <span class="filter-label">平台 / 标签</span>
    ${tagChips}
  </div>` : ''}
</div>

<div class="wrap">

  ${[
    { st: 'open',     label: '📋 待开始', cls: 'st-open',     collapsed: false },
    { st: 'doing',    label: '🔨 开发中', cls: 'st-doing',    collapsed: false },
    { st: 'done',     label: '🔍 待验收', cls: 'st-done',     collapsed: false },
    { st: 'accepted', label: '✅ 已验收', cls: 'st-accepted', collapsed: true  },
  ].map(({ st, label, cls, collapsed }) => `
  <div class="section-block" id="section-${st}">
    <div class="section-title ${cls}" data-toggle="${st}">
      ${label} <span class="s-count">${byStatus[st].length}</span>
      <span class="s-arrow">${collapsed ? '▾ 展开' : '▴ 收起'}</span>
    </div>
    <div class="section-list-wrap ${collapsed ? 'collapsed' : ''}" id="list-wrap-${st}">
      <ul class="todo-list" id="list-${st}">
        ${renderItems(byStatus[st])}
      </ul>
    </div>
  </div>`).join('')}

</div>

<!-- 拒绝验收 Modal -->
<div id="reject-modal" class="modal-overlay" style="display:none">
  <div class="modal-box">
    <h3>拒绝验收</h3>
    <p class="modal-subtitle" id="reject-modal-subtitle"></p>
    <label class="modal-label">拒绝原因<span class="req">*</span></label>
    <textarea class="modal-textarea" id="reject-reason-input" rows="3" placeholder="请说明具体问题，Claude 将以此为依据修复…"></textarea>
    <div class="modal-err" id="reject-reason-err">请填写拒绝原因</div>
    <div id="reject-cmd-wrap" class="modal-cmd-wrap" style="display:none">
      <div class="modal-cmd-label">在终端运行以下命令：</div>
      <code class="modal-cmd-code" id="reject-cmd-text"></code>
      <button class="modal-copy-btn" id="reject-copy-btn">复制命令</button>
    </div>
    <div class="modal-actions">
      <button class="modal-btn modal-btn-cancel" id="reject-cancel-btn">取消</button>
      <button class="modal-btn modal-btn-reject" id="reject-confirm-btn">确认拒绝</button>
    </div>
  </div>
</div>

<script>
(function() {
  let curLevel  = 'all';
  let curStatus = 'all';
  let curTier   = 'all';
  let curTags   = new Set();

  function applyFilter() {
    document.querySelectorAll('.todo-card').forEach(card => {
      const lvl    = card.dataset.level;
      const status = card.dataset.status;
      const tier   = card.dataset.tier;
      const tags   = card.dataset.tags ? card.dataset.tags.split(',') : [];

      let show = true;
      if (curLevel  !== 'all' && lvl    !== curLevel)  show = false;
      if (curStatus !== 'all' && status !== curStatus) show = false;
      if (curTier   !== 'all' && String(tier) !== curTier) show = false;
      if (curTags.size > 0 && ![...curTags].some(t => tags.includes(t))) show = false;

      card.classList.toggle('hidden', !show);
    });

    if (curStatus !== 'all') {
      const wrap = document.getElementById('list-wrap-' + curStatus);
      if (wrap) {
        wrap.classList.remove('collapsed');
        const title = document.querySelector('[data-toggle="' + curStatus + '"] .s-arrow');
        if (title) title.textContent = '▴ 收起';
      }
    }
  }

  document.querySelectorAll('[data-filter-level]').forEach(btn => {
    btn.addEventListener('click', () => {
      curLevel = btn.dataset.filterLevel;
      document.querySelectorAll('[data-filter-level]').forEach(b => b.classList.toggle('active', b === btn));
      applyFilter();
    });
  });

  document.querySelectorAll('[data-filter-tier]').forEach(btn => {
    btn.addEventListener('click', () => {
      curTier = btn.dataset.filterTier;
      document.querySelectorAll('[data-filter-tier]').forEach(b => b.classList.toggle('active', b === btn));
      applyFilter();
    });
  });

  document.querySelectorAll('[data-filter-status]').forEach(btn => {
    btn.addEventListener('click', () => {
      curStatus = btn.dataset.filterStatus;
      document.querySelectorAll('[data-filter-status]').forEach(b => b.classList.toggle('active', b === btn));
      applyFilter();
    });
  });

  document.querySelectorAll('[data-filter-tag]').forEach(btn => {
    btn.addEventListener('click', () => {
      const t = btn.dataset.filterTag;
      if (curTags.has(t)) { curTags.delete(t); btn.classList.remove('active'); }
      else                 { curTags.add(t);    btn.classList.add('active');    }
      applyFilter();
    });
  });

  document.querySelectorAll('.t-tag').forEach(tag => {
    tag.addEventListener('click', e => {
      e.stopPropagation();
      const t = tag.dataset.tag;
      const chip = document.querySelector('[data-filter-tag="'+t+'"]');
      if (chip) chip.click();
    });
  });

  document.querySelectorAll('.section-title[data-toggle]').forEach(title => {
    title.addEventListener('click', () => {
      const st   = title.dataset.toggle;
      const wrap = document.getElementById('list-wrap-' + st);
      const arrow = title.querySelector('.s-arrow');
      if (!wrap) return;
      const collapsed = wrap.classList.toggle('collapsed');
      if (arrow) arrow.textContent = collapsed ? '▾ 展开' : '▴ 收起';
    });
  });

  // ── 拒绝验收 Modal ──
  const modal       = document.getElementById('reject-modal');
  const reasonInput = document.getElementById('reject-reason-input');
  const reasonErr   = document.getElementById('reject-reason-err');
  const cmdWrap     = document.getElementById('reject-cmd-wrap');
  const cmdText     = document.getElementById('reject-cmd-text');
  const copyBtn     = document.getElementById('reject-copy-btn');
  let   rejectId    = null;

  document.querySelectorAll('.reject-btn').forEach(btn => {
    btn.addEventListener('click', e => {
      e.stopPropagation();
      rejectId = btn.dataset.id;
      document.getElementById('reject-modal-subtitle').textContent = '#' + rejectId + ' ' + btn.dataset.title;
      reasonInput.value = '';
      reasonInput.classList.remove('error');
      reasonErr.classList.remove('show');
      cmdWrap.style.display = 'none';
      document.getElementById('reject-confirm-btn').style.display = '';
      copyBtn.textContent = '复制命令';
      modal.style.display = 'flex';
      setTimeout(() => reasonInput.focus(), 80);
    });
  });

  document.getElementById('reject-cancel-btn').addEventListener('click', () => {
    modal.style.display = 'none';
  });

  modal.addEventListener('click', e => {
    if (e.target === modal) modal.style.display = 'none';
  });

  document.getElementById('reject-confirm-btn').addEventListener('click', () => {
    const reason = reasonInput.value.trim();
    if (!reason) {
      reasonInput.classList.add('error');
      reasonErr.classList.add('show');
      reasonInput.focus();
      return;
    }
    const escaped = reason.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
    const cmd = 'node todo/todo.mjs reject ' + rejectId + ' --reason "' + escaped + '"';
    cmdText.textContent = cmd;
    cmdWrap.style.display = 'block';
    document.getElementById('reject-confirm-btn').style.display = 'none';
  });

  reasonInput.addEventListener('input', () => {
    if (reasonInput.value.trim()) {
      reasonInput.classList.remove('error');
      reasonErr.classList.remove('show');
    }
  });

  copyBtn.addEventListener('click', () => {
    navigator.clipboard.writeText(cmdText.textContent).then(() => {
      copyBtn.textContent = '已复制 ✓';
    });
  });
})();
</script>
</body>
</html>`;
}

// ─── CLI 解析 ────────────────────────────────────────────────────────────────

function parseArgs(argv) {
  const args = {};
  let pos = [];
  for (let i = 0; i < argv.length; i++) {
    if (argv[i].startsWith('--')) {
      const key = argv[i].slice(2);
      const val = argv[i+1] && !argv[i+1].startsWith('--') ? argv[++i] : true;
      args[key] = val;
    } else {
      pos.push(argv[i]);
    }
  }
  args._ = pos;
  return args;
}

function findItem(db, id) {
  const n = parseInt(id, 10);
  const item = db.items.find(i => i.id === n);
  if (!item) { console.error(`错误：找不到 id=${n} 的条目`); process.exit(1); }
  return item;
}

// ─── 子命令 ─────────────────────────────────────────────────────────────────

function cmdAdd(db, args) {
  const title = args.title || (args._.join(' ') || '').trim();
  if (!title) { console.error('错误：--title 不能为空'); process.exit(1); }

  const level = ['high','mid','low'].includes(args.level) ? args.level : 'mid';
  const tags  = args.tags ? args.tags.split(',').map(t => t.trim()).filter(Boolean) : [];
  const desc  = args.desc || null;
  const tierRaw = parseInt(args.tier, 10);
  const tier  = [1,2,3].includes(tierRaw) ? tierRaw : null;

  db.seq++;
  const item = {
    id: db.seq,
    title,
    desc,
    level,
    tier,
    tags,
    status: 'open',
    created_at: now(),
    done: false,
    completed_at: null,
    version: null,
  };
  db.items.push(item);
  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  const tierStr = tier ? '·' + TIER_LABEL[tier] : '';
  console.log(`✅ 已添加 #${item.id} [${levelText(level)}${tierStr}] ${title}${tags.length ? '  ' + tags.join('/') : ''}`);
  printSummary(db);
}

/** status <id> <open|doing|done> */
function cmdStatus(db, args) {
  const id        = args._[0];
  const newStatus = args._[1];

  if (newStatus === 'accepted') {
    console.error('❌ 状态 "accepted"（已验收）只能由用户手动修改 todo.json，或使用 `done <id>` 命令');
    process.exit(1);
  }
  if (!['open','doing','done'].includes(newStatus)) {
    console.error(`错误：无效状态 "${newStatus}"，可选：open | doing | done`);
    process.exit(1);
  }

  const item = findItem(db, id);

  // 有未完成子任务时，禁止手动将父任务标记为 done
  if (newStatus === 'done' && !allSubtasksDone(item) && item.subtasks && item.subtasks.length > 0) {
    const { done: doneCount, total } = subtasksDoneCount(item);
    console.error(`❌ 父任务还有未完成的子任务（${doneCount}/${total} 完成），请先通过 sub status 完成所有子任务`);
    process.exit(1);
  }

  item.status = newStatus;
  item.done   = false;

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  const emoji = { open: '📋', doing: '🔨', done: '🔍' }[newStatus];
  console.log(`${emoji} #${item.id}「${item.title}」→ ${STATUS_LABEL[newStatus]}`);
  printSummary(db);
}

/** done <id> [--version vX.Y.Z] */
function cmdDone(db, args) {
  const id   = args._[0];
  const item = findItem(db, id);

  // 有未完成子任务时提示警告（但允许用户强制验收）
  if (item.subtasks && item.subtasks.length > 0 && !allSubtasksDone(item)) {
    const { done: doneCount, total } = subtasksDoneCount(item);
    console.warn(`⚠️  注意：还有未完成的子任务（${doneCount}/${total} 完成），已强制标记为验收`);
  }

  let version = args.version || null;
  if (!version) {
    version = gitTag();
    if (!version) console.warn('⚠️  无法从 git 获取版本号，version 将为空');
  }

  item.status       = 'accepted';
  item.done         = true;
  item.completed_at = now();
  item.version      = version;

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  console.log(`✅ #${item.id}「${item.title}」已验收${version ? '，记入版本 ' + version : ''}`);
  printSummary(db);
}

/** reject <id> --reason "原因" */
function cmdReject(db, args) {
  const id     = args._[0];
  const reason = (args.reason || '').trim();

  if (!reason) {
    console.error('错误：--reason 不能为空，请说明拒绝原因');
    process.exit(1);
  }

  const item = findItem(db, id);
  if (item.status !== 'done') {
    console.error(`错误：只有「待验收（done）」状态的条目才能拒绝，当前状态：${item.status}`);
    process.exit(1);
  }

  const prevLevel    = item.level;
  item.status        = 'open';
  item.done          = false;
  item.level         = 'high';
  item.reject_reason = reason;
  item.rejected_at   = now();
  item.version       = null;

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  console.log(`🚫 #${item.id}「${item.title}」已拒绝${prevLevel !== 'high' ? '，优先级升为最高' : ''}`);
  console.log(`   原因：${reason}`);
  printSummary(db);
}

function cmdReopen(db, args) {
  const id   = args._[0];
  const item = findItem(db, id);

  item.status        = 'open';
  item.done          = false;
  item.completed_at  = null;
  item.version       = null;
  item.reject_reason = null;
  item.rejected_at   = null;

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  console.log(`🔄 #${item.id}「${item.title}」已重新开启`);
  printSummary(db);
}

function cmdRm(db, args) {
  const id  = parseInt(args._[0], 10);
  const idx = db.items.findIndex(i => i.id === id);
  if (idx < 0) { console.error(`错误：找不到 id=${id}`); process.exit(1); }

  const [removed] = db.items.splice(idx, 1);
  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  console.log(`🗑️  #${removed.id}「${removed.title}」已删除`);
  printSummary(db);
}

function cmdList(db) {
  writeFileSync(HTML, buildHtml(db), 'utf8');
  printSummary(db);
  console.log(`📄 HTML：todo/todo.html`);
}

function cmdRender(db) {
  writeFileSync(HTML, buildHtml(db), 'utf8');
  console.log('🖨️  todo/todo.html 已重新渲染');
}

// ─── 子任务命令 ───────────────────────────────────────────────────────────────

/** sub add <parent_id> --title "..." [--tier 1|2|3] [--deps "21A,21B"] */
function cmdSubAdd(db, args) {
  const parentIdRaw = args._[0];
  const title = (args.title || '').trim();
  if (!parentIdRaw) { console.error('错误：请指定父任务 id，例如：sub add 21 --title "..."'); process.exit(1); }
  if (!title)       { console.error('错误：--title 不能为空'); process.exit(1); }

  const parent = findItem(db, parentIdRaw);
  if (!parent.subtasks) parent.subtasks = [];

  const letter = nextSubtaskLetter(parent);
  if (!letter) { console.error('错误：子任务数量已达上限（26）'); process.exit(1); }

  const sid = `${parent.id}${letter}`;
  const tierRaw = parseInt(args.tier, 10);
  const tier = [1,2,3].includes(tierRaw) ? tierRaw : null;
  const deps = args.deps
    ? args.deps.split(',').map(d => d.trim().toUpperCase()).filter(Boolean)
    : [];

  // 校验依赖的 sid 是否存在
  for (const dep of deps) {
    const exists = parent.subtasks.find(s => s.sid === dep);
    if (!exists) { console.error(`错误：依赖的子任务 ${dep} 不存在`); process.exit(1); }
  }

  const sub = { sid, title, tier, deps, status: 'open', created_at: now() };
  parent.subtasks.push(sub);

  // 有子任务的父任务自动进入 doing
  if (parent.status === 'open') {
    parent.status = 'doing';
  }

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  const tierStr = tier ? ` [${TIER_LABEL[tier]}]` : '';
  const depsStr = deps.length ? `  依赖: ${deps.join(', ')}` : '';
  console.log(`✅ 已添加子任务 ${sid}${tierStr}「${title}」→ #${parent.id}「${parent.title}」${depsStr}`);
  printSummary(db);
}

/** sub status <sid> <open|doing|done> */
function cmdSubStatus(db, args) {
  const sid       = (args._[0] || '').toUpperCase();
  const newStatus = args._[1];

  if (!['open','doing','done'].includes(newStatus)) {
    console.error(`错误：无效状态 "${newStatus}"，可选：open | doing | done`);
    process.exit(1);
  }

  const { parent, sub } = findSubtask(db, sid);
  sub.status = newStatus;

  // 所有子任务完成时自动将父任务推进为 done（待验收）
  if (newStatus === 'done' && allSubtasksDone(parent)) {
    parent.status = 'done';
    parent.done   = false;
    console.log(`🎉 所有子任务均已完成，父任务 #${parent.id}「${parent.title}」自动转为「待验收」`);
  }

  save(db);
  writeFileSync(HTML, buildHtml(db), 'utf8');

  const emoji = { open: '📋', doing: '🔨', done: '🔍' }[newStatus];
  console.log(`${emoji} ${sub.sid}「${sub.title}」→ ${STATUS_LABEL[newStatus]}`);
  printSummary(db);
}

/** sub <subcmd> ... */
function cmdSub(db, args) {
  const subCmd  = args._[0];
  const subArgs = { ...args, _: args._.slice(1) };

  switch (subCmd) {
    case 'add':    cmdSubAdd(db, subArgs);    break;
    case 'status': cmdSubStatus(db, subArgs); break;
    default:
      console.error(`未知子命令：sub ${subCmd}\n用法：\n  node todo.mjs sub add <parent_id> --title "..." [--tier N] [--deps "21A,21B"]\n  node todo.mjs sub status <sid> <open|doing|done>`);
      process.exit(1);
  }
}

// ─── 入口 ────────────────────────────────────────────────────────────────────

const [,, subcmd, ...rest] = process.argv;
const db   = load();
const args = parseArgs(rest);

switch (subcmd) {
  case 'add':    cmdAdd(db, args);    break;
  case 'status': cmdStatus(db, args); break;
  case 'done':   cmdDone(db, args);   break;
  case 'reject': cmdReject(db, args); break;
  case 'reopen': cmdReopen(db, args); break;
  case 'rm':     cmdRm(db, args);     break;
  case 'sub':    cmdSub(db, args);    break;
  case 'list':
  case undefined:
  case '':       cmdList(db);         break;
  case 'render': cmdRender(db);       break;
  default:
    console.error(`未知子命令：${subcmd}\n用法：node todo.mjs add|status|done|reject|reopen|rm|sub|list|render`);
    process.exit(1);
}