Set-Variable -Name alarmLength -Value 80 -Option "constant"

function Move-Alarm {
  param($Alarm, $From, $To, [switch]$DeleteOriginal = $false)

  $alarmMgr = Get-View AlarmManager

  $alarmObj = Get-View $Alarm
  $alarmMgr = Get-View AlarmManager
  if($deleteOriginal){
    $alarmObj.RemoveAlarm()
  }
  else{
    $updateAlarm = New-Object VMware.Vim.AlarmSpec
    $updateAlarm = $alarmObj.Info
    $oldName = $alarmObj.Info.Name
    $oldState = $alarmObj.Info.Enabled
    $oldDescription = $alarmObj.Info.Description
    $suffix = " (moved to " + ([string]($to | %{$_.Name + ","})).TrimEnd(",") + ")"
    if(($oldName.Length + $suffix.Length) -gt $alarmLength){
      $newName = $oldName.Substring(0, $alarmLength - $suffix.Length) + $suffix
    }
    else{
      $newName = $oldName + $suffix
    }
    $updateAlarm.Name =  $newName
    $updateAlarm.Enabled = $false
    $updateAlarm.Description += ("`rOriginal name: " + $oldName)
    $updateAlarm.Expression.Expression | %{
      if($_.GetType().Name -eq "EventAlarmExpression"){
        $_.Status = $null
        $needsChange = $true
      }
    }

    $alarmObj.ReconfigureAlarm($updateAlarm)

    $alarmObj.Info.Name = $oldName
    $alarmObj.Info.Enabled = $oldState
    $alarmObj.Info.Description = $oldDescription
  }

  $newAlarm = New-Object VMware.Vim.AlarmSpec
  $newAlarm = $alarmObj.Info
  $oldName = $alarmObj.Info.Name
  $oldDescription = $alarmObj.Info.Description
  foreach($destination in $To){
    if($To.Count -gt 1){
      $suffix = " (" + $destination.Name + ")"
      if(($oldName.Length + $suffix.Length) -gt $alarmLength){
        $newName = $oldName.Substring(0, $alarmLength - $suffix.Length) + $suffix
      }
      else{
        $newName = $oldName + $suffix
      }
      $newAlarm.Name = $newName
      $newAlarm.Description += ("`rOriginal name: " + $oldName)
    }
    $newAlarm.Expression.Expression | %{
      if($_.GetType().Name -eq "EventAlarmExpression"){
        $_.Status = $null
        $needsChange = $true
      }
    }

    $newAlarm.Name = $oldName
    $newAlarm.Description = $oldDescription
    $alarmMgr.CreateAlarm($To.ExtensionData.MoRef,$newAlarm)
  }
}


$to = Get-VM -Name "VM"


$alarm = Get-AlarmDefinition -Name "Test1"
Move-Alarm -Alarm $alarm -To $to -DeleteOriginal:$false