<!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 · Tree (H5)</title>
<link rel="stylesheet" href="../.design_library/kole-ui/colors_and_type.css">
<style>
  /* 对齐 组件2.txt Tree 规范：节点高32px、缩进16px/级、箭头12px、选中 #F0F5FF/#2F54EB */
  .demo { padding: 24px; background: var(--kole-color-page-bg); color: var(--kole-color-text-body); font-family: var(--font-family); }
  h1 { font-size: 20px; margin: 0 0 4px; }
  .sub { color: var(--kole-color-text-secondary); margin: 0 0 24px; font-size: 12px; }
  .kole-tree { min-width: 240px; border: 1px solid var(--kole-color-border); border-radius: 8px; padding: 4px; background: var(--kole-color-card-bg); }

  .kole-tree-node {
    display: flex; align-items: center; gap: 4px; height: 32px; border-radius: 4px;
    cursor: pointer; user-select: none; font-size: 14px; color: var(--kole-color-text-body); padding-right: 8px;
  }
  .kole-tree-node:hover { background: var(--kole-color-page-bg); }
  .kole-tree-node.is-selected { background: var(--kole-color-brand-bg); color: var(--kole-color-brand); }
  .kole-tree-arrow {
    display: inline-flex; align-items: center; justify-content: center; width: 16px; height: 16px;
    font-size: 12px; color: var(--kole-color-text-secondary); transition: transform .15s; flex-shrink: 0;
  }
  .kole-tree-arrow.is-open { transform: rotate(90deg); }
  .kole-tree-arrow-placeholder { width: 16px; flex-shrink: 0; }
  .kole-tree-check { width: 14px; height: 14px; flex-shrink: 0; cursor: pointer; }
  .kole-tree-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
</style>
</head>
<body>
<div class="demo">
  <h1>Kole UI · Tree 组件（纯 H5）</h1>
  <p class="sub">对齐 Tree 规范：节点高32px、缩进16px/级、箭头12px、选中态 #F0F5FF + 品牌色、支持复选框级联</p>

  <label style="font-size:13px;color:var(--color-text-secondary);margin-right:16px;">
    <input type="checkbox" id="chkToggle" checked onchange="checkable=this.checked; render();"> 启用复选框
  </label>
  <div class="kole-tree" role="tree" id="tree" style="margin-top:12px"></div>
</div>

<script>
const treeData = [
  { key: 'org', title: '某某科技', children: [
    { key: 'tech', title: '技术中心', children: [
      { key: 'fe', title: '前端组' },
      { key: 'be', title: '后端组' }
    ]},
    { key: 'product', title: '产品中心', children: [
      { key: 'pm', title: '产品组' },
      { key: 'ux', title: '设计组' }
    ]}
  ]}
];

let checkable = true;
let expanded = new Set(['org']);
let selected = new Set(['fe']);
let checked = new Set(['tech']);

function findNode(key, nodes = treeData) {
  for (const n of nodes) {
    if (n.key === key) return n;
    if (n.children) { const f = findNode(key, n.children); if (f) return f; }
  }
  return null;
}
function descendantKeys(node) {
  let out = [];
  (node.children || []).forEach(c => { out.push(c.key); out = out.concat(descendantKeys(c)); });
  return out;
}
function allChildrenChecked(node, set) {
  if (!node.children || !node.children.length) return set.has(node.key);
  return node.children.every(c => allChildrenChecked(c, set));
}
function hasChildren(n) { return n.children && n.children.length; }

function toggleExpand(key) {
  expanded.has(key) ? expanded.delete(key) : expanded.add(key);
  render();
}
function selectRow(key) {
  selected = new Set([key]); render();
}
function toggleCheck(key) {
  const node = findNode(key);
  const willCheck = !checked.has(key);
  const keys = [key, ...descendantKeys(node)];
  keys.forEach(k => willCheck ? checked.add(k) : checked.delete(k));
  // 向上级联：父节点 = 其所有子节点均勾选
  propagateUp(node);
  render();
}
function propagateUp(node) {
  // 简单向上：遍历所有有父的节点
  function walk(nodes, parent) {
    nodes.forEach(n => {
      if (parent && hasChildren(parent)) {
        if (allChildrenChecked(parent, checked)) checked.add(parent.key);
        else checked.delete(parent.key);
      }
      if (n.children) walk(n.children, n);
    });
  }
  walk(treeData, null);
}

function visibleList() {
  const out = [];
  (function walk(nodes, depth) {
    nodes.forEach(n => {
      out.push({ node: n, depth });
      if (hasChildren(n) && expanded.has(n.key)) walk(n.children, depth + 1);
    });
  })(treeData, 0);
  return out;
}

function render() {
  const root = document.getElementById('tree');
  root.innerHTML = visibleList().map(({ node, depth }) => {
    const open = expanded.has(node.key);
    const arrow = hasChildren(node)
      ? `<span class="kole-tree-arrow ${open ? 'is-open' : ''}" role="tree" onclick="toggleExpand('${node.key}')">▸</span>`
      : `<span class="kole-tree-arrow-placeholder"></span>`;
    const check = checkable
      ? `<input type="checkbox" class="kole-tree-check" role="tree" ${checked.has(node.key) ? 'checked' : ''} onclick="event.stopPropagation();toggleCheck('${node.key}')">`
      : '';
    const sel = selected.has(node.key) ? ' is-selected' : '';
    return `<div class="kole-tree-node${sel}" role="treeitem" tabindex="0" style="padding-left:${depth * 16 + 4}px" onclick="selectRow('${node.key}')">
      ${arrow}${check}<span class="kole-tree-label">${node.title}</span>
    </div>`;
  }).join('');
}
render();
</script>
</body>
</html>
