Param($PackageDir, $LogDir)
if ($PSBoundParameters.Count -ne 2)  { Write-host "Error: -PackageDir <path> -LogDir <Path>" ;exit 1}
If ( -not (Test-Path $packagedir)) { Write-host "Error: -PackageDir <path> does not exist." ;exit 1}
If ( -not (Test-Path $LogDir)) { Write-host "Error: -LogDir <path> does not exist." ;exit 1}

function Write-Log {
  param (
      [string]$Message,
      [string]$LogPath = "$env:TEMP\onlinepatch.log"
    )
  $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
  $entry = "[$timestamp] $Message"
  Add-Content -Path $LogPath -Value $entry
}

$LogPath = "$LogDir\$(hostname)_onlinepatch.log"
if (Test-Path $logPath) {
  $logTime = (get-item $logPath).LastWriteTime
} else {
  $logTime = get-Date("1900/1/1")
}

Write-Log -Message "Start onlinepatch.ps1" -LogPath $LogPath

$packages = (Get-ChildItem -Path $packagedir| where {$_.extension -eq ".msu"} | Sort Name | %{$_.FullName})
if ($packages.Count -gt 0){
  if ((get-item $packages[0]).LastWriteTime -lt $logTime) {
    $outmsg = "It was already installed,"
    Write-Output $outmsg
    Write-Log -Message $outmsg -LogPath $LogPath
    exit 0
  }
}

# run MSRT, if exist
# https://support.microsoft.com/kb/891716
if (Test-Path "$PackageDir\Windows-KB890830-*.exe") {
  Write-Log -Message "Run MSRT (result: $(hostname)_mrt.log)" -LogPath $LogPath
  Copy-Item "$PackageDir\Windows-KB890830-*.exe" "$env:Temp\mymsrt.exe" -Force
  Start-Process "$env:TEMP\mymsrt.exe" -Wait -ArgumentList "/q"
  #Remove-Item "$env:Temp\mymsrt.exe"
  Copy-Item "$env:WinDir\debug\mrt.log" "$LogDir\$(hostname)_mrt.log" -Force
}
#
#$packages = (Get-ChildItem -Path $packagedir| where {$_.extension -eq ".msu"} | Sort Name | %{$_.FullName})

$success = $true
if ($packages.Count -gt 0){
  $outmsg = "Installation of updates is starting... "
  Write-Output $outmsg
  Write-Log -Message $outmsg -LogPath $LogPath
  foreach ($package in $packages){
    Start-Process wusa.exe -Wait -ArgumentList "$package /quiet /norestart"
    if (!($LASTEXITCODE -eq 0)) {
      $success = $false
      $package = "+ " + (Get-Item $package).Name + ": Failed"   
    } else {
      $package = "+ " + (Get-Item $package).Name  + ": Success"
    }
    Write-Output $package
    Write-Log -Message $package -LogPath $LogPath
  } 
  $outmsg = "Finished installing updates."
  Write-Output $outmsg 
  Write-Log -Message $outmsg -LogPath $LogPath
  if ($success) {
    $outmsg = "Info: All updates were successfully installed."
  } else {
    $outmsg = "Info: There is a failed update."
  }
  Write-Output $outmsg
  Write-Log -Message $outmsg -LogPath $LogPath
} else {
  $outmsg = "There are no updates (msu)."
  Write-Output $outmsg
  Write-Log -Message $outmsg -LogPath $LogPath
  #Pause
  exit 0
}
if (Test-Path "HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired") {
  $outmsg = "Pending reboot."
  Write-Output $outmsg + "Press Enter to initiate reboot."
  Write-Log -Message $outmsg -LogPath $LogPath
  #Pause
  $outmsg = "Reboot now!"
  Write-Output $outmsg
  Write-Log -Message $outmsg -LogPath $LogPath
  Restart-Computer -Force
} else {
  $outmsg = "No reboot is required."
  Write-Output $outmsg
  Write-Log -Message $outmsg -LogPath $LogPath
  #Pause
}
exit 0