((root) => {
  const STORAGE_KEY = 'traffic_link_history_v1';
  const MAX_RECORDS = 100;

  function normalize(records) {
    if (!Array.isArray(records)) return [];
    return records.filter((item) => item && item.id && item.url).map((item) => ({
      ...item,
      username: item.username || '未标记',
      userRole: item.userRole || 'unknown'
    })).slice(0, MAX_RECORDS);
  }

  function list() {
    try { return normalize(JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]')); }
    catch (_) { return []; }
  }

  function write(records) {
    const normalized = normalize(records);
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(normalized));
      return { ok:true, records:normalized };
    } catch (_) { return { ok:false, records:normalized }; }
  }

  function add(record) {
    const next = list();
    next.unshift({
      id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
      username: record.username,
      userRole: record.userRole,
      platform: record.platform || '—',
      pkg: record.pkg || '—',
      type: record.type || 'click',
      createdAt: new Date().toISOString(),
      url: record.url
    });
    return write(next);
  }

  function remove(id) { return write(list().filter((item) => item.id !== id)); }
  function replace(records) { return write(records); }
  function clear() { return write([]); }

  root.LinkHistoryStore = { STORAGE_KEY, MAX_RECORDS, list, add, remove, replace, clear };
})(typeof window === 'undefined' ? globalThis : window);