(function () {
  const STORAGE_KEY = 'agent_notify_token';
  const POLL_MS = 3000;

  const elHost = document.getElementById('filter-host');
  const elAgent = document.getElementById('filter-agent');
  const elStatus = document.getElementById('filter-status');
  const elCwd = document.getElementById('filter-cwd');
  const elSessions = document.getElementById('sessions');
  const elError = document.getElementById('error');
  const btnToken = document.getElementById('btn-token');

  let expanded = new Set();
  let pollTimer = null;

  function getToken() {
    return sessionStorage.getItem(STORAGE_KEY) || '';
  }

  function promptToken() {
    const current = getToken();
    const t = window.prompt('API token (Bearer):', current);
    if (t === null) return false;
    const trimmed = t.trim();
    if (!trimmed) {
      sessionStorage.removeItem(STORAGE_KEY);
      return false;
    }
    sessionStorage.setItem(STORAGE_KEY, trimmed);
    return true;
  }

  function ensureToken() {
    if (getToken()) return true;
    return promptToken();
  }

  function showError(msg) {
    if (!msg) {
      elError.textContent = '';
      elError.classList.add('hidden');
      return;
    }
    elError.textContent = msg;
    elError.classList.remove('hidden');
  }

  function basename(path) {
    if (!path) return '';
    const i = Math.max(path.lastIndexOf('/'), path.lastIndexOf('\\'));
    return i >= 0 ? path.slice(i + 1) : path;
  }

  function formatMachine(row) {
    const ips = (row.ips || []).join(', ');
    return row.hostname + (ips ? ' (' + ips + ')' : '');
  }

  function formatTime(iso) {
    if (!iso) return '';
    try {
      const d = new Date(iso);
      return isNaN(d.getTime()) ? iso : d.toLocaleString();
    } catch {
      return iso;
    }
  }

  function escapeHtml(s) {
    const div = document.createElement('div');
    div.textContent = s;
    return div.innerHTML;
  }

  async function apiGet(path) {
    const token = getToken();
    if (!token) throw new Error('No token');
    const res = await fetch(path, {
      headers: { Authorization: 'Bearer ' + token },
    });
    if (res.status === 401) {
      sessionStorage.removeItem(STORAGE_KEY);
      throw new Error('Unauthorized — check token');
    }
    if (!res.ok) {
      throw new Error(res.status + ' ' + res.statusText);
    }
    return res.json();
  }

  function queryParams() {
    const q = new URLSearchParams();
    if (elHost.value) q.set('host', elHost.value);
    if (elAgent.value) q.set('agent', elAgent.value);
    if (elStatus.value) q.set('status', elStatus.value);
    if (elCwd.value) q.set('cwd', elCwd.value);
    const s = q.toString();
    return s ? '?' + s : '';
  }

  function fillSelect(select, values, keepValue) {
    const current = keepValue ? select.value : '';
    while (select.options.length > 1) select.remove(1);
    for (const v of values || []) {
      const opt = document.createElement('option');
      opt.value = v;
      opt.textContent = v;
      select.appendChild(opt);
    }
    if (current && [...select.options].some((o) => o.value === current)) {
      select.value = current;
    }
  }

  async function loadMeta() {
    const meta = await apiGet('/api/v1/meta');
    fillSelect(elHost, meta.hosts, true);
    fillSelect(elAgent, meta.agents, true);
    fillSelect(elCwd, meta.cwds, true);
  }

  async function loadStatus() {
    const rows = await apiGet('/api/v1/status' + queryParams());
    renderTable(Array.isArray(rows) ? rows : []);
  }

  function renderTable(rows) {
    if (rows.length === 0) {
      elSessions.innerHTML =
        '<tr><td colspan="6" class="empty">No sessions</td></tr>';
      return;
    }

    const parts = [];
    for (const row of rows) {
      const key = row.session_key || row.hostname + row.cwd + row.agent;
      const offline = row.status === 'offline';
      const cls = offline ? ' class="offline"' : '';
      const open = expanded.has(key);

      parts.push(
        '<tr' +
          cls +
          ' data-key="' +
          escapeHtml(key) +
          '">' +
          '<td>' +
          escapeHtml(formatMachine(row)) +
          '</td>' +
          '<td title="' +
          escapeHtml(row.cwd || '') +
          '">' +
          escapeHtml(basename(row.cwd)) +
          '</td>' +
          '<td>' +
          escapeHtml(row.agent || '') +
          '</td>' +
          '<td><span class="status">' +
          escapeHtml(row.status || '') +
          '</span></td>' +
          '<td>' +
          escapeHtml(formatTime(row.updated_at)) +
          '</td>' +
          '<td><button type="button" class="btn-expand" data-key="' +
          escapeHtml(key) +
          '">' +
          (open ? 'Hide' : 'Details') +
          '</button></td>' +
          '</tr>'
      );

      if (open) {
        parts.push(
          '<tr class="details-row"><td colspan="6">' +
            '<div class="label">last_user</div>' +
            '<pre>' +
            escapeHtml(row.last_user || '(empty)') +
            '</pre>' +
            '<div class="label">last_agent</div>' +
            '<pre>' +
            escapeHtml(row.last_agent || '(empty)') +
            '</pre>' +
            '</td></tr>'
        );
      }
    }
    elSessions.innerHTML = parts.join('');
  }

  async function refresh() {
    if (!ensureToken()) {
      showError('Token required');
      return;
    }
    try {
      showError('');
      await Promise.all([loadMeta(), loadStatus()]);
    } catch (e) {
      showError(e.message || String(e));
      if (String(e.message || '').includes('Unauthorized')) {
        if (promptToken()) refresh();
      }
    }
  }

  function startPoll() {
    stopPoll();
    pollTimer = setInterval(refresh, POLL_MS);
  }

  function stopPoll() {
    if (pollTimer) {
      clearInterval(pollTimer);
      pollTimer = null;
    }
  }

  [elHost, elAgent, elStatus, elCwd].forEach((el) => {
    el.addEventListener('change', refresh);
  });

  btnToken.addEventListener('click', () => {
    promptToken();
    refresh();
  });

  elSessions.addEventListener('click', (e) => {
    const btn = e.target.closest('.btn-expand');
    if (!btn) return;
    const key = btn.getAttribute('data-key');
    if (expanded.has(key)) expanded.delete(key);
    else expanded.add(key);
    refresh();
  });

  if (!getToken()) promptToken();
  refresh();
  startPoll();
})();