'use strict'
const { deepGetValue } = require('./helpers')

const findWanIp = d => {
  const pub = extractAllInterfaces(d).find(i => i.role === 'internet')
  return pub ? pub.ip : ''
}

const classifyIpRole = (ip, name = '') => {
  if (ip.startsWith('192.168.') || (ip.startsWith('10.') && name === 'br0')) return 'lan'
  if (ip.startsWith('172.17.') || ip.startsWith('172.16.') || name.includes('_10') || name.includes('Management')) return 'management'
  if (ip.startsWith('10.')) return 'service'
  if (!ip.startsWith('169.254.')) return 'internet'
  return 'unknown'
}

const extractAllInterfaces = d => {
  // Device:2 model (TP-Link)
  const ipIfaces = d.Device?.IP?.Interface
  if (ipIfaces) {
    const results = []
    for (const ifKey of Object.keys(ipIfaces)) {
      if (ifKey.startsWith('_')) continue
      const iface = ipIfaces[ifKey]
      if (!iface?.IPv4Address) continue
      const name = iface.Name?._value || ''
      for (const addrKey of Object.keys(iface.IPv4Address)) {
        if (addrKey.startsWith('_')) continue
        const addr = iface.IPv4Address[addrKey]
        const ip = addr?.IPAddress?._value
        if (!ip || ip === '0.0.0.0') continue
        const status = addr.Status?._value
        if (status && status !== 'Enabled') continue
        results.push({ iface: ifKey, name, ip, mask: addr.SubnetMask?._value || '', addrType: addr.AddressingType?._value || '', role: classifyIpRole(ip, name) })
      }
    }
    if (results.length) return results
  }

  // IGD model (Raisecom) — WANDevice.1.WANConnectionDevice.*.WANIPConnection.*
  const wanDev = d.InternetGatewayDevice?.WANDevice?.['1']?.WANConnectionDevice
  if (wanDev) {
    const results = []
    for (const cdKey of Object.keys(wanDev)) {
      if (cdKey.startsWith('_')) continue
      const cd = wanDev[cdKey]
      const wanIp = cd?.WANIPConnection?.['1']
      if (!wanIp) continue
      const ip = wanIp.ExternalIPAddress?._value
      if (!ip || ip === '0.0.0.0') continue
      const name = wanIp.Name?._value || `WAN${cdKey}`
      const status = wanIp.ConnectionStatus?._value || ''
      results.push({ iface: cdKey, name, ip, mask: wanIp.SubnetMask?._value || '', addrType: wanIp.AddressingType?._value || '', role: classifyIpRole(ip, name), status })
    }
    if (results.length) return results
  }
  return []
}

const countAllWifiClients = d => {
  const aps = d.Device?.WiFi?.AccessPoint
  if (!aps) return { direct: 0, mesh: 0, total: 0, perAp: [] }
  let direct = 0, mesh = 0
  const perAp = []
  for (const k of Object.keys(aps)) {
    if (k.startsWith('_') || !aps[k]) continue
    const n = Number(aps[k].AssociatedDeviceNumberOfEntries?._value) || 0
    const ssidRef = aps[k].SSIDReference?._value || ''
    const ssidIdx = ssidRef.match(/SSID\.(\d+)/)
    const idx = ssidIdx ? parseInt(ssidIdx[1]) : parseInt(k)
    if (idx <= 8) direct += n; else mesh += n
    if (n > 0) perAp.push({ ap: k, ssid: ssidRef, clients: n })
  }
  return { direct, mesh, total: direct + mesh, perAp }
}

const extractMeshTopology = d => {
  const apDevices = d.Device?.WiFi?.MultiAP?.APDevice
  if (!apDevices) return null
  const nodes = []
  let totalClients = 0
  for (const dk of Object.keys(apDevices)) {
    if (dk.startsWith('_')) continue
    const dev = apDevices[dk]
    if (!dev?._object) continue
    const name = dev.X_TP_HostName?._value || ''
    const mac = dev.MACAddress?._value || ''
    let nodeClients = 0
    for (const rk of Object.keys(dev.Radio || {})) {
      if (rk.startsWith('_')) continue
      for (const ak of Object.keys(dev.Radio[rk]?.AP || {})) {
        if (ak.startsWith('_')) continue
        nodeClients += Number(dev.Radio[rk].AP[ak]?.AssociatedDeviceNumberOfEntries?._value) || 0
      }
    }
    totalClients += nodeClients
    if (name || mac) nodes.push({ id: dk, name, active: dev.X_TP_Active?._value === true, mac, ip: dev.X_TP_IPAddress?._value || '', clients: nodeClients })
  }
  return nodes.length ? { nodes, totalClients } : null
}

const extractIgdWifiSSIDs = d => {
  const wlanCfg = d.InternetGatewayDevice?.LANDevice?.['1']?.WLANConfiguration
  if (!wlanCfg) return null
  const ssids = []
  for (const k of Object.keys(wlanCfg)) {
    if (k.startsWith('_')) continue
    const cfg = wlanCfg[k]
    const ssid = cfg?.SSID?._value
    if (!ssid) continue
    ssids.push({
      index: parseInt(k),
      ssid,
      band: ssid.endsWith('-5G') ? '5GHz' : '2.4GHz',
      enabled: cfg.Enable?._value === true || cfg.Enable?._value === 'true',
    })
  }
  return ssids.length ? ssids : null
}

const summarizeDevice = d => {
  const g = path => deepGetValue(d, path)
  const s = path => { const v = g(path); return v != null ? String(v) : '' }
  const counts = countAllWifiClients(d)
  const mesh = extractMeshTopology(d)
  return {
    _id: d._id,
    serial: s('DeviceID.SerialNumber')
      || s('InternetGatewayDevice.DeviceInfo.SerialNumber')
      || s('Device.DeviceInfo.SerialNumber')
      || d.DeviceID?.SerialNumber?._value
      || (d._id ? decodeURIComponent(d._id.split('-').slice(2).join('-')) : '')
      || '',
    manufacturer: s('DeviceID.Manufacturer') || d.DeviceID?.Manufacturer?._value || d._deviceId?._Manufacturer || '',
    model: s('DeviceID.ProductClass') || d.DeviceID?.ProductClass?._value || d._deviceId?._ProductClass || s('InternetGatewayDevice.DeviceInfo.ModelName') || '',
    oui: s('DeviceID.OUI') || d.DeviceID?.OUI?._value || d._deviceId?._OUI || '',
    firmware: s('InternetGatewayDevice.DeviceInfo.SoftwareVersion') || s('Device.DeviceInfo.SoftwareVersion') || '',
    uptime: g('InternetGatewayDevice.DeviceInfo.UpTime') || g('Device.DeviceInfo.UpTime') || null,
    lastInform: d._lastInform || null, lastBoot: d._lastBootstrap || null, registered: d._registered || null,
    interfaces: extractAllInterfaces(d),
    ip: s('InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnection.1.ExternalIPAddress') || findWanIp(d) || '',
    rxPower: g('InternetGatewayDevice.WANDevice.1.X_GponInterafceConfig.RXPower')
      || g('InternetGatewayDevice.WANDevice.1.WANCommonInterfaceConfig.RXPower')
      || g('Device.Optical.Interface.1.Stats.SignalRxPower')
      || g('Device.Optical.Interface.1.OpticalSignalLevel') || null,
    txPower: g('InternetGatewayDevice.WANDevice.1.X_GponInterafceConfig.TXPower')
      || g('InternetGatewayDevice.WANDevice.1.WANCommonInterfaceConfig.TXPower')
      || g('Device.Optical.Interface.1.Stats.SignalTxPower')
      || g('Device.Optical.Interface.1.TransmitOpticalLevel') || null,
    pppoeUser: s('InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANPPPConnection.1.Username') || s('Device.PPP.Interface.1.Username') || '',
    ssid: s('InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.SSID') || s('Device.WiFi.SSID.1.SSID') || '',
    macAddress: s('InternetGatewayDevice.WANDevice.1.WANEthernetInterfaceConfig.MACAddress') || s('Device.Ethernet.Interface.1.MACAddress') || '',
    tags: d._tags || [],
    opticalStatus: s('Device.Optical.Interface.1.Status') || null,
    opticalErrors: { sent: g('Device.Optical.Interface.1.Stats.ErrorsSent') || 0, received: g('Device.Optical.Interface.1.Stats.ErrorsReceived') || 0 },
    wifi: {
      radio1: { status: s('Device.WiFi.Radio.1.Status') || null, channel: g('Device.WiFi.Radio.1.Channel') || null, bandwidth: s('Device.WiFi.Radio.1.CurrentOperatingChannelBandwidth') || null, noise: g('Device.WiFi.Radio.1.Stats.Noise') || null, clients: g('Device.WiFi.AccessPoint.1.AssociatedDeviceNumberOfEntries') || 0 },
      radio2: { status: s('Device.WiFi.Radio.2.Status') || null, channel: g('Device.WiFi.Radio.2.Channel') || null, bandwidth: s('Device.WiFi.Radio.2.CurrentOperatingChannelBandwidth') || null, noise: g('Device.WiFi.Radio.2.Stats.Noise') || null, clients: g('Device.WiFi.AccessPoint.2.AssociatedDeviceNumberOfEntries') || 0 },
      radio3: { status: s('Device.WiFi.Radio.3.Status') || null, channel: g('Device.WiFi.Radio.3.Channel') || null, clients: g('Device.WiFi.AccessPoint.3.AssociatedDeviceNumberOfEntries') || 0 },
      totalClients: mesh ? mesh.totalClients : counts.total,
      directClients: counts.direct,
      meshClients: mesh ? (mesh.totalClients - counts.direct) : counts.mesh,
    },
    mesh: mesh ? mesh.nodes : null,
    hostsCount: g('Device.Hosts.HostNumberOfEntries')
      || g('InternetGatewayDevice.LANDevice.1.Hosts.HostNumberOfEntries') || null,
    ethernet: {
      port1: { status: s('Device.Ethernet.Interface.1.Status') || s('InternetGatewayDevice.LANDevice.1.LANEthernetInterfaceConfig.1.Status') || null, speed: g('Device.Ethernet.Interface.1.MaxBitRate') || null },
      port2: { status: s('Device.Ethernet.Interface.2.Status') || s('InternetGatewayDevice.LANDevice.1.LANEthernetInterfaceConfig.2.Status') || null, speed: g('Device.Ethernet.Interface.2.MaxBitRate') || null },
      port3: { status: s('InternetGatewayDevice.LANDevice.1.LANEthernetInterfaceConfig.3.Status') || null },
      port4: { status: s('InternetGatewayDevice.LANDevice.1.LANEthernetInterfaceConfig.4.Status') || null },
    },
    // IGD WiFi SSIDs (Raisecom — no per-radio stats, just SSIDs)
    wifiSSIDs: extractIgdWifiSSIDs(d),
  }
}

module.exports = { summarizeDevice }