/* ============================================================
   新建商品 · 共享 Drawer 模块
   ----------------------------------------------------------
   在任意页面只需 <script src="assets/new-product-drawer.js"> 引入,
   然后调用 NewProductDrawer.open({ onSave: fn }) 即可在当前页之上
   弹出右侧 Drawer。点击遮罩 / X / 取消 / ESC 关闭后,用户停在原页面。

   提供:
     window.NewProductDrawer.open(opts?)
     window.NewProductDrawer.close()
   opts 字段:
     onSave(product)  — 保存时回调,product = { id, name, cat, target,
                        points: string[], images: { id, dataUrl, name }[] }
   ============================================================ */
(function () {
  'use strict';
  if (window.NewProductDrawer) return; // idempotent

  const DRAWER_ID    = 'npd-drawer';
  const DRAWER_BG_ID = 'npd-drawer-bg';

  /* ---------- 注入样式(独立 namespace 以免与 products.html 冲突) ---------- */

  const CSS = `
  /* drawer base (相同尺寸/动画) */
  #${DRAWER_BG_ID} {
    position: fixed; inset: 0;
    background: rgba(21, 20, 15, .32);
    display: none; z-index: 1100;
  }
  #${DRAWER_BG_ID}.show { display: block; }
  #${DRAWER_ID} {
    position: fixed; right: 0; top: 0; bottom: 0;
    width: 820px; max-width: 100vw;
    background: var(--surface);
    border-left: 1px solid var(--border-faint);
    z-index: 1101;
    transform: translateX(100%);
    transition: transform .25s cubic-bezier(.32, .72, 0, 1);
    display: flex; flex-direction: column;
    box-shadow: -4px 0 24px rgba(21, 20, 15, .04);
  }
  #${DRAWER_ID}.show { transform: translateX(0); }
  #${DRAWER_ID} .drawer-h {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-faint);
    display: flex; align-items: center;
  }
  #${DRAWER_ID} .drawer-h h3 { font-size: 16px; font-weight: 600; color: var(--accent-black); }
  #${DRAWER_ID} .drawer-h .x {
    margin-left: auto; width: 32px; height: 32px;
    border-radius: var(--r-md);
    display: grid; place-items: center;
    color: var(--black-alpha-56); cursor: pointer;
    background: transparent; border: 0;
    transition: background var(--t-base);
  }
  #${DRAWER_ID} .drawer-h .x:hover { background: var(--black-alpha-4); color: var(--accent-black); }
  #${DRAWER_ID} .drawer-b { padding: 24px 28px; overflow-y: auto; flex: 1; overscroll-behavior: contain; }
  #${DRAWER_ID} .drawer-f {
    padding: 14px 24px;
    border-top: 1px solid var(--border-faint);
    display: flex; gap: 10px; align-items: center;
    background: var(--surface);
  }
  #${DRAWER_ID} .drawer-f .btn-guide {
    margin-right: auto;
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 13px; color: var(--black-alpha-56);
    background: transparent; border: 0; cursor: pointer;
    padding: 8px 10px; border-radius: var(--r-md);
    font-family: inherit;
    transition: background var(--t-base), color var(--t-base);
  }
  #${DRAWER_ID} .drawer-f .btn-guide:hover { color: var(--accent-black); background: var(--black-alpha-4); }
  #${DRAWER_ID} .drawer-f .btn-guide svg { width: 14px; height: 14px; }

  /* form-card */
  #${DRAWER_ID} .form-h {
    font-size: 15px; font-weight: 600; color: var(--accent-black);
    margin-bottom: 18px; padding-bottom: 12px;
    border-bottom: 1px solid var(--border-faint);
  }
  #${DRAWER_ID} .field { margin-bottom: 16px; }
  #${DRAWER_ID} .field:last-child { margin-bottom: 0; }
  #${DRAWER_ID} .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 16px; }
  #${DRAWER_ID} .field-label {
    display: block; font-size: 13px; font-weight: 500;
    color: var(--accent-black); margin-bottom: 6px;
  }
  #${DRAWER_ID} .field-label .req { color: var(--heat); margin-left: 2px; }
  #${DRAWER_ID} .field-label .opt {
    color: var(--black-alpha-48); font-weight: 400; font-size: 12px; margin-left: 6px;
  }
  #${DRAWER_ID} .input,
  #${DRAWER_ID} .select {
    width: 100%; height: 38px;
    background: var(--background-lighter);
    border: 1px solid var(--black-alpha-12);
    border-radius: var(--r-md);
    padding: 0 14px;
    font-size: 13.5px; color: var(--accent-black);
    outline: none; font-family: inherit;
    transition: border-color var(--t-base);
  }
  #${DRAWER_ID} .input:focus,
  #${DRAWER_ID} .select:focus {
    border-color: var(--heat-40);
    box-shadow: inset 0 0 0 1px var(--heat-40);
  }

  /* upload */
  #${DRAWER_ID} .pf-upload-row {
    display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 16px; align-items: stretch;
  }
  #${DRAWER_ID} .pf-upload-zone {
    border: 1.5px dashed var(--black-alpha-24);
    border-radius: var(--r-md);
    padding: 28px 20px;
    background: var(--background-lighter);
    cursor: pointer; text-align: center;
    transition: border-color var(--t-base), background var(--t-base);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    min-height: 180px;
  }
  #${DRAWER_ID} .pf-upload-zone:hover { border-color: var(--heat); background: var(--heat-8); }
  #${DRAWER_ID} .pf-upload-zone .uz-ic {
    width: 44px; height: 44px;
    margin: 0 auto 10px;
    background: var(--surface);
    border: 1px solid var(--heat-20);
    border-radius: var(--r-md);
    color: var(--heat);
    display: grid; place-items: center;
  }
  #${DRAWER_ID} .pf-upload-zone .uz-ic svg { width: 20px; height: 20px; }
  #${DRAWER_ID} .pf-upload-zone .uz-t { font-size: 14px; color: var(--accent-black); font-weight: 500; }
  #${DRAWER_ID} .pf-upload-zone .uz-t strong { color: var(--heat); font-weight: 600; }
  #${DRAWER_ID} .pf-upload-zone .uz-d {
    margin-top: 8px;
    font-family: var(--font-mono); font-size: 11.5px;
    color: var(--black-alpha-48); letter-spacing: .02em;
  }
  #${DRAWER_ID} .pf-example {
    background: var(--background-lighter);
    border: 1px solid var(--border-faint);
    border-radius: var(--r-md);
    padding: 16px;
    display: flex; flex-direction: column; gap: 10px;
  }
  #${DRAWER_ID} .pf-example .ex-h { font-size: 13px; font-weight: 600; color: var(--accent-black); }
  #${DRAWER_ID} .pf-example .ex-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
  #${DRAWER_ID} .pf-example .ex-grid .ex-thumb {
    aspect-ratio: 1;
    background: var(--surface);
    border: 1px solid var(--border-faint);
    border-radius: var(--r-sm);
    overflow: hidden; position: relative;
    display: grid; place-items: center;
    color: var(--black-alpha-32);
  }
  #${DRAWER_ID} .pf-example .ex-grid .ex-thumb svg { width: 22px; height: 22px; }
  #${DRAWER_ID} .pf-example .ex-grid .ex-thumb::after {
    content: ''; position: absolute; inset: 0;
    background: repeating-linear-gradient(135deg, transparent 0 6px, rgba(0,0,0,.03) 6px 7px);
    pointer-events: none;
  }
  #${DRAWER_ID} .pf-example .ex-d { font-size: 12px; color: var(--black-alpha-56); line-height: 1.5; }
  #${DRAWER_ID} .pf-grid {
    display: grid; grid-template-columns: repeat(5, 1fr);
    gap: 8px; margin-top: 12px;
  }
  #${DRAWER_ID} .pf-grid:empty { display: none; }
  #${DRAWER_ID} .pf-thumb {
    aspect-ratio: 1;
    background: var(--background-lighter);
    border: 1px solid var(--border-faint);
    border-radius: var(--r-md);
    position: relative; overflow: hidden; cursor: pointer;
  }
  #${DRAWER_ID} .pf-thumb img { width: 100%; height: 100%; object-fit: cover; }
  #${DRAWER_ID} .pf-thumb .pf-x {
    position: absolute; top: 4px; right: 4px;
    width: 22px; height: 22px;
    background: rgba(0,0,0,.7); color: var(--accent-white);
    border: 0; border-radius: 50%; cursor: pointer;
    display: grid; place-items: center;
    opacity: 0; transition: opacity var(--t-base);
  }
  #${DRAWER_ID} .pf-thumb:hover .pf-x { opacity: 1; }
  #${DRAWER_ID} .pf-thumb .pf-x svg { width: 11px; height: 11px; }

  /* bullet-list */
  #${DRAWER_ID} .bullet-list { list-style: none; padding: 0; margin: 0; }
  #${DRAWER_ID} .bullet-list .bl-item,
  #${DRAWER_ID} .bullet-list .bl-add {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 12px;
    background: var(--background-lighter);
    border: 1px solid var(--border-faint);
    border-radius: var(--r-md);
    margin-bottom: 6px;
    font-size: 13.5px;
  }
  #${DRAWER_ID} .bullet-list .bl-add { background: transparent; border-style: dashed; }
  #${DRAWER_ID} .bullet-list .num {
    width: 22px; height: 22px;
    background: var(--surface);
    border: 1px solid var(--border-faint);
    border-radius: var(--r-sm);
    font-family: var(--font-mono);
    font-size: 11px; color: var(--heat); font-weight: 700;
    display: grid; place-items: center; flex-shrink: 0;
  }
  #${DRAWER_ID} .bullet-list .bl-text { flex: 1; color: var(--accent-black); }
  #${DRAWER_ID} .bullet-list .bl-input {
    flex: 1; background: transparent; border: 0; outline: none;
    font-size: 13.5px; color: var(--accent-black); font-family: inherit;
  }
  #${DRAWER_ID} .bullet-list .bl-x {
    width: 22px; height: 22px;
    color: var(--black-alpha-48);
    cursor: pointer; display: grid; place-items: center;
    border-radius: var(--r-sm);
    transition: color var(--t-base), background var(--t-base);
  }
  #${DRAWER_ID} .bullet-list .bl-x:hover { color: var(--accent-crimson); background: var(--crimson-bg); }
  #${DRAWER_ID} .bullet-list .bl-x svg { width: 11px; height: 11px; }

  @media (max-width: 900px) {
    #${DRAWER_ID} .pf-upload-row { grid-template-columns: 1fr; }
  }
  `;

  const HTML = `
  <div id="${DRAWER_BG_ID}"></div>
  <aside id="${DRAWER_ID}" role="dialog" aria-label="新建商品" aria-hidden="true">
    <div class="drawer-h">
      <h3>新建商品</h3>
      <button class="x" type="button" data-act="close" aria-label="关闭">
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M6 6l12 12M6 18L18 6"/></svg>
      </button>
    </div>
    <div class="drawer-b">
      <div class="form-card">
        <div class="form-h">基础信息</div>

        <div class="field">
          <label class="field-label">商品名称<span class="req">*</span></label>
          <input class="input" data-f="name" placeholder="请输入商品名称(必填)" maxlength="100">
        </div>

        <div class="field-row">
          <div>
            <label class="field-label">品类<span class="req">*</span></label>
            <select class="select" data-f="cat">
              <option>美妆个护</option>
              <option>服饰内衣</option>
              <option>食品饮料</option>
              <option>家居家电</option>
              <option>数码 3C</option>
              <option>个护清洁</option>
              <option>运动户外</option>
              <option>母婴亲子</option>
            </select>
          </div>
          <div>
            <label class="field-label">目标人群<span class="opt">(选填)</span></label>
            <input class="input" data-f="target" placeholder="例: 22-32 岁女性、敏感肌、办公室通勤">
          </div>
        </div>

        <div class="field">
          <label class="field-label">商品主图<span class="req">*</span></label>
          <input type="file" data-f="file" accept="image/*" multiple hidden>
          <div class="pf-upload-row">
            <div class="pf-upload-zone" data-act="upload-zone">
              <div class="uz-ic">
                <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4M17 8l-5-5-5 5M12 3v12"/></svg>
              </div>
              <div class="uz-t">点击上传或<strong>拖拽图片</strong>到此处</div>
              <div class="uz-d">// 支持 JPG、PNG 格式,建议尺寸 800×800 以上,大小不超过 10MB</div>
            </div>
            <div class="pf-example">
              <div class="ex-h">示例图</div>
              <div class="ex-grid">
                <div class="ex-thumb"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round"><path d="M7 4h10l1 4v12H6V8l1-4z"/><path d="M9 4v3M15 4v3M9 11h6M9 14h6"/></svg></div>
                <div class="ex-thumb"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round"><rect x="6" y="5" width="12" height="15" rx="2"/><path d="M9 9h6M9 12h6M9 15h4"/></svg></div>
                <div class="ex-thumb"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3h8l1 5v12H7V8l1-5z"/><circle cx="12" cy="13" r="2.5"/></svg></div>
              </div>
              <div class="ex-d">优质的商品图有助于生成更好的素材效果</div>
            </div>
          </div>
          <div class="pf-grid" data-f="grid"></div>
        </div>

        <div class="field" style="margin-bottom: 0;">
          <label class="field-label">核心卖点<span class="req">*</span></label>
          <ul class="bullet-list" data-f="bullets">
            <li class="bl-add"><span class="num">+</span><input class="bl-input" placeholder="添加新卖点 · 回车确认"></li>
          </ul>
        </div>
      </div>
    </div>

    <div class="drawer-f">
      <button class="btn-guide" type="button" data-act="guide">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="9"/><path d="M9.5 9a2.5 2.5 0 015 0c0 1.5-2.5 2-2.5 4M12 17h.01"/></svg>
        使用指南
      </button>
      <button class="btn" type="button" data-act="cancel">取消</button>
      <button class="btn btn-primary" type="button" data-act="save">
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 12l5 5L20 6"/></svg>
        创建商品
      </button>
    </div>
  </aside>
  `;

  /* ---------- DOM refs (populated by ensureInjected) ---------- */
  let injected = false;
  let bg, drawer, $f, $grid, $bullets, $blInput;
  let currentOpts = {};
  const PF_MAX = 5;
  let pfFiles = []; // { id, dataUrl, name }
  const blXSvg = '<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"><path d="M4 4l8 8M12 4l-8 8"/></svg>';

  function esc(s) { return String(s == null ? '' : s).replace(/[<>&"]/g, c => ({ '<':'&lt;','>':'&gt;','&':'&amp;','"':'&quot;' })[c]); }
  function uid() { return Date.now().toString(36) + Math.random().toString(36).slice(2, 5); }
  function toast(msg, sub) {
    if (typeof Shell !== 'undefined' && Shell && Shell.toast) Shell.toast(msg, sub);
  }

  function ensureInjected() {
    if (injected) return;
    // style
    const styleEl = document.createElement('style');
    styleEl.textContent = CSS;
    document.head.appendChild(styleEl);
    // html
    const wrap = document.createElement('div');
    wrap.innerHTML = HTML;
    while (wrap.firstChild) document.body.appendChild(wrap.firstChild);

    bg       = document.getElementById(DRAWER_BG_ID);
    drawer   = document.getElementById(DRAWER_ID);
    $f       = {
      name:   drawer.querySelector('[data-f="name"]'),
      cat:    drawer.querySelector('[data-f="cat"]'),
      target: drawer.querySelector('[data-f="target"]'),
      file:   drawer.querySelector('[data-f="file"]'),
    };
    $grid    = drawer.querySelector('[data-f="grid"]');
    $bullets = drawer.querySelector('[data-f="bullets"]');
    $blInput = $bullets.querySelector('.bl-add .bl-input');

    bindEvents();
    injected = true;
  }

  function bindEvents() {
    // 关闭交互
    bg.addEventListener('click', close);
    drawer.addEventListener('click', e => {
      const a = e.target.closest('[data-act]');
      if (!a) return;
      const act = a.dataset.act;
      if (act === 'close')  return close();
      if (act === 'cancel') return close();
      if (act === 'guide')  return toast('使用指南', '点击查看完整填写指南');
      if (act === 'save')   return save();
      if (act === 'upload-zone') return openFilePicker();
    });
    document.addEventListener('keydown', e => {
      if (e.key === 'Escape' && drawer.classList.contains('show')) close();
    });

    // 上传
    $f.file.addEventListener('change', e => { addFiles(e.target.files); e.target.value = ''; });
    const zone = drawer.querySelector('[data-act="upload-zone"]');
    zone.addEventListener('dragover', e => { e.preventDefault(); zone.style.borderColor = 'var(--heat)'; });
    zone.addEventListener('dragleave', () => { zone.style.borderColor = ''; });
    zone.addEventListener('drop', e => {
      e.preventDefault(); zone.style.borderColor = '';
      if (e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files.length) addFiles(e.dataTransfer.files);
    });

    // 卖点 bullet-list
    $blInput.addEventListener('keydown', e => {
      if (e.key === 'Enter') { e.preventDefault(); blAdd($blInput.value); $blInput.value = ''; }
    });
  }

  function openFilePicker() { if (pfFiles.length < PF_MAX) $f.file.click(); }

  function pfRender() {
    $grid.innerHTML = pfFiles.map(u => `
      <div class="pf-thumb" data-id="${u.id}">
        <img src="${u.dataUrl}" alt="${esc(u.name)}">
        <button class="pf-x" type="button" title="删除">
          <svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"><path d="M4 4l8 8M12 4l-8 8"/></svg>
        </button>
      </div>
    `).join('');
    $grid.querySelectorAll('.pf-thumb .pf-x').forEach(b => {
      b.onclick = e => {
        e.stopPropagation();
        const id = b.closest('.pf-thumb').dataset.id;
        const i = pfFiles.findIndex(f => f.id === id);
        if (i >= 0) { pfFiles.splice(i, 1); pfRender(); }
      };
    });
  }

  function addFiles(fileList) {
    const room = PF_MAX - pfFiles.length;
    if (room <= 0) { toast('已达上限', PF_MAX + ' / ' + PF_MAX + ' 张'); return; }
    const incoming = [...fileList].filter(f => f.type.startsWith('image/')).slice(0, room);
    let done = 0;
    incoming.forEach(f => {
      const r = new FileReader();
      r.onload = e => {
        pfFiles.push({ id: uid(), dataUrl: e.target.result, name: f.name });
        if (++done === incoming.length) {
          pfRender();
          toast('已上传', '+ ' + done + ' 张 · 共 ' + pfFiles.length + ' / ' + PF_MAX);
        }
      };
      r.readAsDataURL(f);
    });
  }

  function blRenumber() {
    [...$bullets.querySelectorAll('.bl-item')].forEach((li, i) => {
      li.querySelector('.num').textContent = i + 1;
    });
  }
  function blAdd(text) {
    const t = (text || '').trim();
    if (!t) return;
    const li = document.createElement('li');
    li.className = 'bl-item';
    li.innerHTML = '<span class="num">0</span><span class="bl-text">' + esc(t) + '</span><span class="bl-x" title="删除">' + blXSvg + '</span>';
    $bullets.querySelector('.bl-add').before(li);
    li.querySelector('.bl-x').addEventListener('click', () => {
      li.style.transition = 'opacity .15s, transform .15s';
      li.style.opacity = 0;
      li.style.transform = 'translateX(-8px)';
      setTimeout(() => { li.remove(); blRenumber(); }, 150);
    });
    blRenumber();
  }
  function getBullets() {
    return [...$bullets.querySelectorAll('.bl-item .bl-text')].map(t => t.textContent.trim()).filter(Boolean);
  }

  /* ---------- API ---------- */

  function resetForm() {
    $f.name.value = '';
    $f.cat.value = $f.cat.options[0].value;
    $f.target.value = '';
    pfFiles = [];
    pfRender();
    [...$bullets.querySelectorAll('.bl-item')].forEach(li => li.remove());
    $blInput.value = '';
  }

  function lockBody() {
    // 优先用 Shell 的引用计数实现(避免多 overlay 互相解锁)
    if (typeof Shell !== 'undefined' && Shell && typeof Shell.lockScroll === 'function') {
      Shell.lockScroll();
      return;
    }
    // 兜底: Shell 未加载时本地锁
    const docEl = document.documentElement;
    const sbw = window.innerWidth - docEl.clientWidth;
    drawer._lockSnap = {
      bodyOverflow: document.body.style.overflow,
      bodyPaddingRight: document.body.style.paddingRight,
      htmlOverflow: docEl.style.overflow,
    };
    document.body.style.overflow = 'hidden';
    docEl.style.overflow = 'hidden';
    if (sbw > 0) document.body.style.paddingRight = sbw + 'px';
  }
  function unlockBody() {
    if (typeof Shell !== 'undefined' && Shell && typeof Shell.unlockScroll === 'function') {
      Shell.unlockScroll();
      return;
    }
    const s = drawer._lockSnap;
    if (s) {
      document.body.style.overflow = s.bodyOverflow;
      document.body.style.paddingRight = s.bodyPaddingRight;
      document.documentElement.style.overflow = s.htmlOverflow;
      drawer._lockSnap = null;
    }
  }

  function open(opts) {
    ensureInjected();
    if (drawer.classList.contains('show')) return; // 已开则不重复锁
    currentOpts = opts || {};
    resetForm();
    bg.classList.add('show');
    drawer.classList.add('show');
    drawer.setAttribute('aria-hidden', 'false');
    lockBody();
    setTimeout(() => $f.name.focus(), 280);
  }

  function close() {
    if (!injected) return;
    if (!drawer.classList.contains('show')) return; // 已关则不重复解锁
    bg.classList.remove('show');
    drawer.classList.remove('show');
    drawer.setAttribute('aria-hidden', 'true');
    unlockBody();
    if (typeof currentOpts.onClose === 'function') currentOpts.onClose();
  }

  function save() {
    const name   = ($f.name.value || '').trim();
    const cat    = $f.cat.value;
    const target = ($f.target.value || '').trim();
    const points = getBullets();
    const images = pfFiles.slice();

    if (!name) {
      toast('请填写商品名称');
      $f.name.focus();
      return;
    }
    if (images.length === 0) {
      toast('请上传商品主图', '至少 1 张');
      return;
    }
    if (points.length === 0) {
      toast('请添加核心卖点', '至少 1 条');
      $blInput.focus();
      return;
    }

    const product = {
      id: 'np-' + uid(),
      name, cat, target,
      points,
      images,
      imgs: images.length,
    };
    toast('商品已创建', '+ ' + name);
    if (typeof currentOpts.onSave === 'function') currentOpts.onSave(product);
    close();
  }

  window.NewProductDrawer = { open, close };

  /* ---------- sessionStorage 自动打开钩子 ---------- */
  // 任何页面只要在跳转前 sessionStorage.setItem('npd-auto-open','1') 即可,
  // 落地页加载完模块后,会自动 open() 一次并清掉 flag。
  // 用于:product-create.html 重定向后让落地页弹出 drawer,而不是用户重新点击。
  function checkAutoOpen() {
    try {
      if (sessionStorage.getItem('npd-auto-open') === '1') {
        sessionStorage.removeItem('npd-auto-open');
        // 延后一拍,确保宿主页面自己的 init 已经跑完
        setTimeout(() => open(), 50);
      }
    } catch (e) { /* sessionStorage 不可用就静默放弃 */ }
  }
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', checkAutoOpen);
  } else {
    checkAutoOpen();
  }
})();