# Copyright (c) 2026, R. W. Rodolico
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# 1. Redistributions of source code must retain the above copyright notice, this
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# windows_network.ps1
# Up network adapters: IPv4/IPv6 address, netmask, MAC, MTU.
# Sensor contract: unix/sensors/Documentation/README.md; keys: Documentation/Spec.md 7.6
# Must stay Windows PowerShell 5.1 compatible and pure ASCII.
#
# Version 1.0.0 20261018 Claude
# Initial version (bug 211, stage W2)

Import-Module ([IO.Path]::Combine($PSScriptRoot, '..', 'lib', 'SysinfoSensor.psm1'))
Test-SysinfoWindows

# dotted netmask from a prefix length (0 to 32)
function ConvertTo-Netmask {
   param([int]$Prefix)
   if ($Prefix -lt 0 -or $Prefix -gt 32) { return '' }
   $mask = 0
   if ($Prefix -gt 0) { $mask = ([long]4294967295 -shl (32 - $Prefix)) -band 4294967295 }
   $octets = foreach ($shift in 24, 16, 8, 0) { ($mask -shr $shift) -band 255 }
   return ($octets -join '.')
}

Invoke-SysinfoSensor {
   foreach ($cmd in 'Get-NetAdapter', 'Get-NetIPAddress', 'Get-NetIPInterface') {
      if ($null -eq (Get-Command $cmd -ErrorAction SilentlyContinue)) {
         Exit-SysinfoSensor -Code $SYSINFO_EXIT_NOT_APPLICABLE -Message "$cmd not available"
      }
   }
   foreach ($adapter in @(Get-NetAdapter -ErrorAction Stop | Where-Object { $_.Status -eq 'Up' })) {
      $name = [string]$adapter.Name
      $index = $adapter.ifIndex
      $v4 = @(Get-NetIPAddress -InterfaceIndex $index -AddressFamily IPv4 -ErrorAction SilentlyContinue | Where-Object { $_.IPAddress -ne '127.0.0.1' })
      $v6 = @(Get-NetIPAddress -InterfaceIndex $index -AddressFamily IPv6 -ErrorAction SilentlyContinue | Where-Object { $_.IPAddress -ne '::1' })

      if ($v4.Count -gt 0) {
         Write-SysinfoFact -Path @('network', $name, 'address') -Value $v4[0].IPAddress
         Write-SysinfoFact -Path @('network', $name, 'netmask') -Value (ConvertTo-Netmask ([int]$v4[0].PrefixLength))
      }
      if ($v6.Count -gt 0) {
         $chosen = $v6 | Where-Object { ([string]$_.IPAddress) -notlike 'fe80:*' } | Select-Object -First 1
         if ($null -eq $chosen) { $chosen = $v6[0] }
         Write-SysinfoFact -Path @('network', $name, 'ip6address') -Value (([string]$chosen.IPAddress) -replace '%.*$', '')
         Write-SysinfoFact -Path @('network', $name, 'ip6networkbits') -Value $chosen.PrefixLength
      }
      Write-SysinfoFact -Path @('network', $name, 'mac') -Value (([string]$adapter.MacAddress -replace '-', ':').ToLowerInvariant())

      $mtu = ''
      $iface = Get-NetIPInterface -InterfaceIndex $index -AddressFamily IPv4 -ErrorAction SilentlyContinue | Select-Object -First 1
      if ($null -ne $iface -and $null -ne $iface.NlMtu) { $mtu = [string]$iface.NlMtu }
      Write-SysinfoFact -Path @('network', $name, 'mtu') -Value $mtu
   }
}