<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Kole UI · ListPicker (H5)</title>
<link rel="stylesheet" href="../.design_library/kole-ui/colors_and_type.css">
<link rel="stylesheet" href="./ListPicker.css">
<style>
  .demo { padding: 24px; background: var(--kole-color-page-bg); font-family: var(--font-family); }
  h1 { font-size: 20px; margin: 0 0 4px; color: var(--kole-color-text-title); }
  .sub { color: var(--kole-color-text-secondary); margin: 0 0 24px; font-size: 12px; }
  .demo-block { background: var(--kole-color-card-bg); border-radius: 8px; padding: 24px; margin-bottom: 20px; }
  .demo-block > .hint { color: var(--kole-color-text-secondary); font-size: 12px; margin: 0 0 12px; }
</style>
</head>
<body>
<div class="demo">
  <h1>Kole UI · ListPicker 组件（纯 H5）</h1>
  <p class="sub">对齐 ListPicker 规范：下拉列表、多选、分组、搜索、全选、标签</p>

  <div class="demo-block">
    <p class="hint">技术栈多选（分组 + 搜索 + 全选）</p>
    <div class="kole-listpicker" data-listpicker></div>
  </div>
</div>

<script>
const OPTIONS = [
  { label: '前端', children: [{ value: 'vue', label: 'Vue' }, { value: 'react', label: 'React' }, { value: 'ng', label: 'Angular', disabled: true }] },
  { label: '后端', children: [{ value: 'java', label: 'Java' }, { value: 'go', label: 'Go' }, { value: 'py', label: 'Python' }] }
];
const FLAT = OPTIONS.flatMap(g => g.children);
const LABEL = Object.fromEntries(FLAT.map(o => [o.value, o.label]));

function init(root) {
  let value = ['vue', 'react'];
  let open = false;
  let query = '';

  const trigger = document.createElement('div');
  trigger.className = 'kole-listpicker-trigger'; trigger.setAttribute('role','button'); trigger.setAttribute('tabindex','0'); trigger.setAttribute('aria-haspopup','listbox'); trigger.setAttribute('aria-expanded','false');

  function renderTrigger() {
    if (!value.length) { trigger.innerHTML = '<span class="kole-listpicker-placeholder">请选择技术栈</span>'; }
    else {
      trigger.innerHTML = value.map(v => `<span class="kole-listpicker-tag">${LABEL[v]}<span class="x" data-rm="${v}">×</span></span>`).join('');
    }
    trigger.innerHTML += '<span class="kole-listpicker-caret">▾</span>';
    trigger.classList.toggle('is-open', open);
  }

  function renderPanel() {
    let panel = root.querySelector('.kole-listpicker-panel');
    if (!panel) { panel = document.createElement('div'); panel.className = 'kole-listpicker-panel'; root.appendChild(panel); }
    const visible = FLAT.filter(o => o.label.includes(query));
    let html = '<div class="kole-listpicker-search"><input placeholder="搜索"></div>';
    html += '<div class="kole-listpicker-selectall">全选</div>';
    OPTIONS.forEach(g => {
      const items = g.children.filter(o => o.label.includes(query));
      if (!items.length) return;
      html += `<div class="kole-listpicker-group-label">${g.label}</div>`;
      items.forEach(o => {
        const checked = value.includes(o.value);
        html += `<div class="kole-listpicker-option ${checked ? 'is-checked' : ''}${o.disabled ? ' is-disabled' : ''}" data-val="${o.value}"><span class="box">${checked ? '✓' : ''}</span>${o.label}</div>`;
      });
    });
    html += visible.length ? '' : '<div class="kole-listpicker-empty">无匹配项</div>';
    panel.innerHTML = html;

    panel.querySelector('input').addEventListener('input', (e) => { query = e.target.value; renderPanel(); });
    panel.querySelector('.kole-listpicker-selectall').addEventListener('click', () => {
      value = [...new Set([...value, ...visible.map(o => o.value)])]; renderTrigger(); renderPanel();
    });
    panel.querySelectorAll('.kole-listpicker-option').forEach(opt => {
      opt.addEventListener('click', () => {
        const v = opt.dataset.val;
        value = value.includes(v) ? value.filter(x => x !== v) : [...value, v];
        renderTrigger(); renderPanel();
      });
    });
  }

  trigger.addEventListener('click', (e) => {
    const rm = e.target.closest('[data-rm]');
    if (rm) { e.stopPropagation(); value = value.filter(x => x !== rm.dataset.rm); renderTrigger(); return; }
    e.stopPropagation();
    open = !open; renderTrigger(); renderPanel();
  });
  root.appendChild(trigger);
  document.addEventListener('click', (e) => {
    if (!root.contains(e.target)) { open = false; query = ''; renderTrigger(); }
  });
  renderTrigger();
}
document.querySelectorAll('[data-listpicker]').forEach(init);
</script>
</body>
</html>
