async function api(path, opts = {}) {
  opts.headers = Object.assign({ 'Content-Type': 'application/json' }, opts.headers || {});
  const r = await fetch(path, opts);
  if (!r.ok) throw new Error('HTTP ' + r.status);
  return r.json();
}
/* ═══ NexusOps v2 UI: live console, sparklines, schedules, groups, alerts ═══ */

// ── Live Console (drawer) ──
let consoleNode = null;
let consoleEventSource = null;

function openLiveConsole(nodeId, hostname) {
  consoleNode = { id: nodeId, hostname };
  document.getElementById('consoleDrawerHostname').textContent = hostname;
  document.getElementById('consoleOutput').innerHTML = '';
  document.getElementById('consoleDrawer').classList.add('active');
  document.getElementById('consoleInput').focus();

  // ask agent to fast-poll
  api(`/api/nodes/${nodeId}/fastpoll`, { method: 'POST', body: JSON.stringify({ slow: false }) }).catch(() => {});

  const url = `/api/nodes/${nodeId}/console${nexusToken ? '?token=' + encodeURIComponent(nexusToken) : ''}`;
  const out = document.getElementById('consoleOutput');
  appendConsoleLine('── console attached (fast-poll active) ──', 'sys');
  consoleEventSource = new EventSource(url);
  consoleEventSource.onmessage = (ev) => {
    try {
      const d = JSON.parse(ev.data);
      if (d.type === 'output') appendConsoleLine(d.text, 'out');
    } catch (e) {}
  };
  consoleEventSource.onerror = () => appendConsoleLine('── stream interrupted, retrying… ──', 'sys');
}

function closeLiveConsole() {
  if (consoleEventSource) { consoleEventSource.close(); consoleEventSource = null; }
  if (consoleNode) {
    // restore slow polling
    api(`/api/nodes/${consoleNode.id}/fastpoll`, { method: 'POST', body: JSON.stringify({ slow: true }) }).catch(() => {});
  }
  document.getElementById('consoleDrawer').classList.remove('active');
  consoleNode = null;
}

function appendConsoleLine(text, cls) {
  const out = document.getElementById('consoleOutput');
  const div = document.createElement('div');
  div.className = 'console-line ' + (cls || 'out');
  div.textContent = text;
  out.appendChild(div);
  out.scrollTop = out.scrollHeight;
}

async function consoleRunCommand() {
  const input = document.getElementById('consoleInput');
  const cmd = input.value.trim();
  if (!cmd || !consoleNode) return;
  appendConsoleLine(`$ ${cmd}`, 'cmd');
  input.value = '';
  try {
    const r = await fetch(`/api/nodes/${consoleNode.id}/command`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ command: cmd, actionType: 'raw_command' })
    });
    if (!r.ok) appendConsoleLine('! failed to queue command', 'sys');
  } catch (e) {
    appendConsoleLine('! failed to queue command', 'sys');
  }
}

// ── Sparklines (inline SVG from metricsHistory) ──
function sparkline(values, color) {
  if (!values || values.length < 2) return '<span style="color:var(--text-muted);font-size:0.7rem">no history</span>';
  const w = 90, h = 24, max = Math.max(...values, 100);
  const pts = values.map((v, i) => `${(i / (values.length - 1)) * w},${h - (v / max) * h}`).join(' ');
  return `<svg width="${w}" height="${h}" class="sparkline"><polyline points="${pts}" fill="none" stroke="${color}" stroke-width="1.5"/></svg>`;
}

// Patch renderNodesGrid to add sparkline row + console button
const _origRenderNodesGrid = renderNodesGrid;
renderNodesGrid = function () {
  _origRenderNodesGrid();
  // inject sparklines into each node card
  document.querySelectorAll('.node-card').forEach((card, idx) => {
    // cards render in filtered order; match by hostname text — safer: find by data via original data
  });
  // Simpler: re-render footer metrics with sparkline data attribute injection
};
// Simpler approach: monkey-patch the map output by wrapping string injection
(function patchSparklines() {
  const orig = renderNodesGrid;
  renderNodesGrid = function () {
    orig();
    // attach sparkline next to heartbeat label per card using nodesData order
    const cards = document.querySelectorAll('#nodesGrid .node-card');
    const filtered = nodesData.filter(node => {
      const search = (document.getElementById('searchInput')?.value || '').toLowerCase();
      const matchesFilter = currentFilter === 'all' || node.status === currentFilter;
      const matchesSearch = !search ||
        node.hostname.toLowerCase().includes(search) ||
        node.ip.toLowerCase().includes(search) ||
        node.platform.toLowerCase().includes(search) ||
        node.id.toLowerCase().includes(search);
      return matchesFilter && matchesSearch;
    });
    cards.forEach((card, i) => {
      const node = filtered[i];
      if (!node) return;
      const hist = (node.metricsHistory || []).map(m => m.cpu);
      const foot = card.querySelector('.node-actions');
      if (foot) {
        const spark = document.createElement('span');
        spark.innerHTML = sparkline(hist, node.status === 'online' ? '#4ade80' : '#f87171');
        spark.title = 'CPU history (last 30 beats)';
        spark.style.marginRight = '0.5rem';
        foot.parentNode.insertBefore(spark, foot);
        // live console button
        const btn = document.createElement('button');
        btn.className = 'btn-icon';
        btn.title = 'Live Console';
        btn.innerHTML = '<i class="fa-solid fa-terminal"></i>';
        btn.onclick = () => openLiveConsole(node.id, node.hostname.replace(/'/g, "\\'"));
        foot.insertBefore(btn, foot.firstChild);
      }
    });
  };
})();

// ── Schedules panel ──
function openSchedulesModal() {
  document.getElementById('schedulesModal').classList.add('active');
  renderSchedules();
  api('/api/groups').then(g => {
    const sel = document.getElementById('schedTag');
    sel.innerHTML = '<option value="all">All nodes</option>' +
      (g.groups || []).map(x => `<option value="${escapeHtml(x.tag)}">${escapeHtml(x.tag)} (${x.count})</option>`).join('');
  }).catch(() => {});
}

function closeSchedulesModal() {
  document.getElementById('schedulesModal').classList.remove('active');
}

function renderSchedules() {
  api('/api/schedules').then(d => {
    const el = document.getElementById('schedulesList');
    if (!d.schedules || !d.schedules.length) {
      el.innerHTML = '<div class="empty-state" style="padding:1rem"><p>No scheduled tasks yet. Add one below.</p></div>';
      return;
    }
    el.innerHTML = d.schedules.map(s => `
      <div class="schedule-item">
        <div>
          <strong>${escapeHtml(s.name)}</strong>
          <span class="sched-meta">${escapeHtml(s.command)} • every ${s.intervalSec}s • group: ${escapeHtml(s.tag)}</span>
        </div>
        <div class="node-actions">
          <button class="btn-icon" title="${s.enabled ? 'Pause' : 'Resume'}" onclick="toggleSchedule('${s.id}')">
            <i class="fa-solid fa-${s.enabled ? 'pause' : 'play'}"></i>
          </button>
          <button class="btn-icon" title="Delete" onclick="deleteSchedule('${s.id}')">
            <i class="fa-solid fa-trash-can"></i>
          </button>
        </div>
      </div>`).join('');
  }).catch(() => {});
}

async function createSchedule() {
  const name = document.getElementById('schedName').value.trim();
  const command = document.getElementById('schedCommand').value.trim();
  const interval = parseInt(document.getElementById('schedInterval').value, 10);
  const tag = document.getElementById('schedTag').value || 'all';
  if (!command || !interval || interval < 15) { toast('Need a command and interval ≥ 15s', 'error'); return; }
  await api('/api/schedules', { method: 'POST', body: JSON.stringify({ name, command, intervalSec: interval, tag }) });
  document.getElementById('schedName').value = '';
  document.getElementById('schedCommand').value = '';
  toast('Schedule created', 'success');
  renderSchedules();
}

async function toggleSchedule(id) {
  await api(`/api/schedules/${id}/toggle`, { method: 'POST' });
  renderSchedules();
}

async function deleteSchedule(id) {
  await api(`/api/schedules/${id}`, { method: 'DELETE' });
  renderSchedules();
}

// ── Group bulk command modal ──
function openGroupCommandModal() {
  document.getElementById('groupCmdModal').classList.add('active');
  api('/api/groups').then(g => {
    const sel = document.getElementById('groupCmdTag');
    sel.innerHTML = '<option value="all">All nodes</option>' +
      (g.groups || []).map(x => `<option value="${escapeHtml(x.tag)}">${escapeHtml(x.tag)} (${x.count})</option>`).join('');
  }).catch(() => {});
}

function closeGroupCommandModal() {
  document.getElementById('groupCmdModal').classList.remove('active');
}

async function submitGroupCommand() {
  const command = document.getElementById('groupCmdInput').value.trim();
  const tag = document.getElementById('groupCmdTag').value || 'all';
  if (!command) { toast('Enter a command', 'error'); return; }
  try {
    const d = await api('/api/groups/command', { method: 'POST', body: JSON.stringify({ command, tag }) });
    toast(`Queued on ${d.count} node(s) in "${tag}"`, 'success');
    closeGroupCommandModal();
  } catch (e) {
    toast('Failed to queue group command', 'error');
  }
}

// ── Alerts feed ──
function renderAlerts() {
  const el = document.getElementById('alertsFeed');
  if (!el) return;
  api('/api/alerts').then(d => {
    const alerts = d.alerts || [];
    document.getElementById('alertCount').textContent = `${alerts.length}`;
    el.innerHTML = alerts.length
      ? alerts.slice().reverse().map(a => `
        <div class="log-entry error">
          [${new Date(a.ts).toLocaleTimeString()}] ⚠️ ${escapeHtml(a.message)}
        </div>`).join('')
      : '<div class="log-entry system">No alerts. All nodes checking in.</div>';
  }).catch(() => {});
}
setInterval(renderAlerts, 15000);

console.log('[v2] UI additions loaded');