# 실제 LAN IP (Docker/Hyper-V 172.17.x 등 가상 어댑터 제외)
param(
  [string]$PreferredPrefix = '172.16.'
)

$override = $env:EENE_LAN_IP
if ($override) {
  Write-Output $override.Trim()
  exit 0
}

function Test-PhysicalAdapter {
  param([int]$IfIndex)
  $adapter = Get-NetAdapter -InterfaceIndex $IfIndex -ErrorAction SilentlyContinue
  if (-not $adapter -or $adapter.Status -ne 'Up') { return $false }
  $desc = $adapter.InterfaceDescription
  if ($desc -match 'Virtual|Hyper-V|Docker|WSL|vEthernet|VMware|Loopback|TAP|TUN|VPN') { return $false }
  return $true
}

$candidates = Get-NetIPAddress -AddressFamily IPv4 -ErrorAction SilentlyContinue |
  Where-Object {
    $_.IPAddress -match '^(172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.|10\.)' -and
    $_.IPAddress -notmatch '^169\.254\.' -and
    $_.IPAddress -notmatch '^172\.17\.' -and
    (Test-PhysicalAdapter -IfIndex $_.InterfaceIndex)
  }

if (-not $candidates) {
  $candidates = Get-NetIPAddress -AddressFamily IPv4 -ErrorAction SilentlyContinue |
    Where-Object {
      $_.IPAddress -match '^(172\.|192\.168\.|10\.)' -and
      $_.IPAddress -notmatch '^169\.254\.' -and
      $_.IPAddress -notmatch '^172\.17\.'
    }
}

$ip = $candidates |
  Sort-Object @{
    Expression = {
      if ($_.IPAddress -like "$PreferredPrefix*") { 0 }
      elseif ($_.IPAddress -match '^192\.168\.') { 1 }
      elseif ($_.IPAddress -match '^10\.') { 2 }
      else { 3 }
    }
  }, @{ Expression = { $_.PrefixLength } } |
  Select-Object -First 1 -ExpandProperty IPAddress

if ($ip) { Write-Output $ip }