<!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 · Mention</title>
  <link rel="stylesheet" href="../.design_library/kole-ui/colors_and_type.css" />
  <link rel="stylesheet" href="./Mention.css" />
</head>
<body>
  <div class="kole-page">
    <h2 class="kole-h2">Mention @ 提及</h2>
    <p class="kole-desc">输入框输入 @ 触发用户面板，选择后以标签形式插入，可删除。</p>

    <div class="kole-demo">
      <div class="kole-mention" id="mention">
        <div class="kole-mention-area">
          <textarea class="kole-mention-input" id="input" rows="3" placeholder="输入 @ 提及同事…"></textarea>
          <div class="kole-mention-panel" id="panel" style="display:none"></div>
        </div>
        <div class="kole-mention-chips" id="chips"></div>
      </div>
    </div>
  </div>

  <script>
    var users = [
      { name: '王伟', dept: '华东大区' },
      { name: '李娜', dept: '华南大区' },
      { name: '张强', dept: '华北大区' },
      { name: '陈静', dept: '研发中心' },
      { name: '刘洋', dept: '市场部' }
    ];
    var input = document.getElementById('input');
    var panel = document.getElementById('panel');
    var chips = document.getElementById('chips');
    var active = -1, mentioned = [];

    function renderPanel() {
      panel.innerHTML = users.map(function (u, i) {
        return '<div class="kole-mention-item' + (i === active ? ' is-active' : '') + '" role="option" data-i="' + i + '">' +
          '<span class="kole-mention-avatar">' + u.name[0] + '</span>' +
          '<span class="kole-mention-name">' + u.name + '</span>' +
          '<span class="kole-mention-dept">' + u.dept + '</span></div>';
      }).join('');
    }
    function openPanel() { active = -1; renderPanel(); panel.style.display = 'block'; }
    function closePanel() { panel.style.display = 'none'; }
    function insert(name) {
      var pos = input.selectionStart;
      var v = input.value;
      // 找到触发 @ 的位置（当前光标前一个 @ 且其后无空格）
      var at = v.lastIndexOf('@', pos - 1);
      if (at >= 0 && (at === 0 || /\s/.test(v[at - 1]))) {
        input.value = v.slice(0, at) + '@' + name + ' ' + v.slice(pos);
      } else {
        input.value = v.slice(0, pos) + '@' + name + ' ' + v.slice(pos);
      }
      if (mentioned.indexOf(name) < 0) mentioned.push(name);
      renderChips();
      closePanel();
      input.focus();
    }
    function renderChips() {
      chips.innerHTML = mentioned.map(function (n) {
        return '<span class="kole-mention-chip">@' + n + ' <b data-n="' + n + '">×</b></span>';
      }).join('');
    }
    input.addEventListener('input', function () {
      var pos = input.selectionStart;
      var v = input.value;
      var at = v.lastIndexOf('@', pos - 1);
      if (at >= 0 && (at === 0 || /\s/.test(v[at - 1])) && !/\s/.test(v.slice(at + 1, pos))) openPanel();
      else closePanel();
    });
    input.addEventListener('keydown', function (e) {
      if (panel.style.display === 'none') return;
      if (e.key === 'ArrowDown') { e.preventDefault(); active = Math.min(users.length - 1, active + 1); renderPanel(); }
      else if (e.key === 'ArrowUp') { e.preventDefault(); active = Math.max(0, active - 1); renderPanel(); }
      else if (e.key === 'Enter' && active >= 0) { e.preventDefault(); insert(users[active].name); }
      else if (e.key === 'Escape') closePanel();
    });
    panel.addEventListener('click', function (e) {
      var it = e.target.closest('.kole-mention-item');
      if (it) insert(users[parseInt(it.dataset.i, 10)].name);
    });
    chips.addEventListener('click', function (e) {
      var b = e.target.closest('[data-n]');
      if (b) { mentioned = mentioned.filter(function (n) { return n !== b.dataset.n; }); renderChips(); }
    });
    document.addEventListener('click', function (e) {
      if (!document.getElementById('mention').contains(e.target)) closePanel();
    });
  </script>
</body>
</html>
