function mergeDeviceData(siwDevices, merakiClients) {
  return siwDevices.map(siw => {
    // Primary match: name
    let match = merakiClients.find(m => 
      m.description && siw.name && 
      m.description.toLowerCase().includes(siw.name.toLowerCase())
    );

    // Fallback: MAC address
    if (!match && siw.mac) {
      match = merakiClients.find(m => 
        m.mac && m.mac.toLowerCase() === siw.mac.toLowerCase()
      );
    }

    return {
      name: siw.name || siw.deviceName || 'Unknown',
      ip: siw.ip || siw.ipAddress || match?.ip || 'N/A',
      status: match?.status === 'Online' ? '✅ Connected' : '❌ Disconnected',
      lastSeen: match?.lastSeen 
        ? new Date(match.lastSeen * 1000).toLocaleString() 
        : 'N/A',
      deeplink: match?.mac 
        ? `https://dashboard.meraki.com/o/${match.orgId || 'your-org'}/n/${match.networkId || 'your-net'}/clients?mac=${match.mac}` 
        : null
    };
  }).sort((a, b) => a.name.localeCompare(b.name));
}

module.exports = { mergeDeviceData };