// labdb — Admin web client
const api = {
   async _fetch(path, opts) {
      const o = Object.assign({ credentials: 'same-origin' }, opts || {});
      o.headers = Object.assign({ 'Content-Type': 'application/json' }, o.headers || {});
      const res = await fetch(path, o);
      if (res.status === 401 && !location.pathname.endsWith('/login.html')) {
         location.href = '/login.html';
         return { error: 'unauthorized' };
      }
      try { return await res.json(); } catch (_) { return { error: 'invalid response' }; }
   },
   get(p)         { return this._fetch(p); },
   post(p, body)  { return this._fetch(p, { method: 'POST', body: JSON.stringify(body || {}) }); },
   patch(p, body) { return this._fetch(p, { method: 'PATCH', body: JSON.stringify(body || {}) }); },
   del(p)         { return this._fetch(p, { method: 'DELETE' }); },
};

function esc(s) {
   if (s === null || s === undefined) return '';
   return String(s)
      .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;').replace(/'/g, '&#39;');
}

function formatDate(iso) {
   if (!iso) return '—';
   const d = new Date(iso);
   if (isNaN(d)) return '—';
   const pad = (n) => String(n).padStart(2, '0');
   return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
}

function formatDuration(start, end) {
   if (!start || !end) return '—';
   const ms = new Date(end) - new Date(start);
   if (isNaN(ms) || ms < 0) return '—';
   const sec = Math.floor(ms / 1000);
   const h = Math.floor(sec / 3600);
   const m = Math.floor((sec % 3600) / 60);
   const s = sec % 60;
   return `${String(h).padStart(2,'0')}:${String(m).padStart(2,'0')}:${String(s).padStart(2,'0')}`;
}