param (
    [string]$hypervclustername,
    [string]$VMName
)

Function WriteXmlToScreen ([xml]$xml) {
    $StringWriter = New-Object System.IO.StringWriter;
    $XmlWriter = New-Object System.Xml.XmlTextWriter $StringWriter;
    $XmlWriter.Formatting = "indented";
    $xml.WriteTo($XmlWriter);
    $XmlWriter.Flush();
    $StringWriter.Flush();
    Write-Output $StringWriter.ToString();
}

# Make the script dynamic by getting the node list from the cluster
$clusternodes = Get-ClusterNode -Cluster $hypervclustername | select name

#add the list of VMs to an array
$details = @()
foreach($clusternode in $clusternodes) {
    $details += Get-VM -ComputerName $clusternode.name | select VMName, State, ComputerName, Uptime, CPUUsage, MemoryAssigned, MemoryDemand
}

#filter the array for the VM we asked for
$details = $details | ?{$_.VMName -eq $VMName}

#create the XML
$XML = "<prtg>"
foreach($detail in $details) {
    $VMName = $detail.VMName
    $VMState = $detail.State
    if($detail.state -eq "Running") {
        $CPUUsage = $detail.CPUUsage
        $cluster = $detail.ComputerName
        $MemoryUsage = ("{0:p0}" -f ($detail.MemoryDemand / $detail.MemoryAssigned)).Replace("%","")

        $XML += "<result>"
        $XML += "<channel>CPU Usage</channel>"
        $XML += "<value>$CPUUsage</value>"
        $XML += "<unit>CPU</unit>"
        $XML += "</result>"

        $XML += "<result>"
        $XML += "<channel>Memory Usage</channel>"
        $XML += "<value>$MemoryUsage</value>"
        $XML += "<unit>Percent</unit>"
        $XML += "</result>"
        $XML += "<text>Node: $cluster</text>"
    }elseif($VMState -eq "Off") {
        $XML += "<error>1</error>"
        $XML += "<text>VM Offline</text>"
    }
}
$XML += "</prtg>"

#output the XML
WriteXmlToScreen $XML