let logMonitorEl = null;

async function logMonitor() {
  setTimeout(logMonitor, opts.logmonitor_refresh_period);
  if (logMonitorEl) logMonitorEl.parentElement.style.display = opts.logmonitor_show ? 'block' : 'none';
  if (!opts.logmonitor_show) return;
  const res = await fetch('/sdapi/v1/log?clear=True');
  if (res?.ok) {
    if (!logMonitorEl) logMonitorEl = document.getElementById('logMonitorData');
    if (!logMonitorEl) return;
    logMonitorEl.parentElement.style.display = 'block';
    const lines = await res.json();
    for (const line of lines) {
      const l = JSON.parse(line);
      const row = document.createElement("tr");
      row.style = 'padding: 10px; margin: 0;';
      row.innerHTML = `<td>${new Date(1000 * l.created).toISOString()}</td><td>${l.level}</td><td>${l.facility}</td><td>${l.module}</td><td>${l.msg}</td>`;
      logMonitorEl.appendChild(row);
      while (logMonitorEl.childElementCount > 100) logMonitorEl.removeChild(logMonitorEl.firstChild);
      logMonitorEl.scrollTop = logMonitorEl.scrollHeight
    }
  }
}

async function logMonitorCreate() {
  const el = document.getElementsByTagName('footer')[0];
  if (!el) return;
  el.classList.add('log-monitor');
  el.innerHTML = `
    <table style="width: 100%">
      <thead style="display: block; text-align: left; border-bottom: solid 1px var(--button-primary-border-color)">
        <tr>
          <th style="width: 170px">Time</th>
          <th>Level</th>
          <th style="width: 72px">Facility</th>
          <th style="width: 124px">Module</th>
          <th>Message</th>
        </tr>
      </thead>
      <tbody id="logMonitorData" style="white-space: nowrap; height: 10vh; width: 100vw; display: block; overflow-x: hidden; overflow-y: scroll">
      </tbody>
    </table>
  `;
  logMonitor();
}