Function Convert-TemplateToVM($template){
	
	Write-Host "Converting" $vm -ForegroundColor Yellow		
	Set-Template $template -ToVM -RunAsync | out-null
}

Function PowerOn-VM($vm){

	Start-VM -VM $vm -Confirm:$false -RunAsync
	
		do {
			$vmview = get-VM $vm | Get-View
			$status = $vmview.Guest.ToolsStatus
	
				Write-Host $vm is starting! -ForegroundColor Yellow
				sleep 5
	
		}until(($status -match "toolsOld") -or ($status -match "toolsOk"))
		
		if ($status -match "Ok"){
			$Startup = "Ok"}
		elseif($status -match "toolsOld"){
			$Startup = "ToolsOld"}
		else{
			$Startup = "Not Ready"}
		
		return $Startup

}

Function Check-ToolsStatus($vm){

	$vmview = get-VM $vm | Get-View
	$status = $vmview.Guest.ToolsStatus

		if ($status -match "toolsOld"){
			$vmTools = "Old"}
		elseif($status -match "toolsNotRunning"){
			$vmTools = "Not Running"}
		else{
			$vmTools = "Ok"}
		return $vmTools
}

Function Check-VMHardwareVersion($vm){
	$vmView = get-VM $vm | Get-View
	$vmVersion = $vmView.Config.Version
	$v4 = "vmx-04"
	$v7 = "vmx-07"
	
		if ($vmVersion -eq $v4){
			$vmHardware = "Old"}
		elseif($vmVersion -eq $v7){
			$vmHardware = "Ok"}		
		else{Write-Host "Error!!" -ForegroundColor Red
			$vmHardware = "Error"}
		
		return $vmHardware
}

Function PowerOff-VM($vm){
		
		sleep 20
		Shutdown-VMGuest -VM $vm -Confirm:$false
					
			do {
				$vmview = Get-VM $vm | Get-View
				$status = $vmview.Guest.ToolsStatus
	
					Write-Host $vm is stopping! -ForegroundColor Yellow
					sleep 5
	
			}until($status -match "toolsNotRunning") 
			if ($status -match "toolsNotRunning"){
			$Shutdown = "Ok"}
			else{
			$Shutdown = "Not Ready"}
			return $Shutdown	
}

Function ConvertTo-Template($vm){
	
	Write-Host "Converting" $vm -ForegroundColor Yellow
	$vmview = Get-VM $vm | Get-View
	$vmview.MarkAsTemplate() | Out-Null	

}

Function Upgrade-VMHardware($vm){

	$vmview = Get-VM $vm | Get-View
	$vmVersion = $vmView.Config.Version
	$v4 = "vmx-04"
	$v7 = "vmx-07"

		if ($vmVersion -eq $v4){
			Write-Host "Version 4 detected" -ForegroundColor Red
			
			# Update Hardware
			Write-Host "Upgrading Hardware on" $vm -ForegroundColor Yellow
			Get-View ($vmView.UpgradeVM_Task($v7)) | Out-Null
	}	
}

$vCenter = Read-Host "Enter your vCenter servername"
Connect-VIServer $vCenter

$tmpfile = "$env:temp\tmpfile.csv"
$templates = Get-Template -Name * | Export-Csv -NoTypeInformation $tmpfile
$csv = Import-CSV $tmpfile

	foreach($item in $csv){
		$template = $item.Name
		
			#Convert Template back to VM
			Convert-TemplateToVM $template
	}
	
	foreach($item in $csv){	
		$vm = $item.Name
		$vmHardware = Check-VMHardwareVersion $vm
		
				
			if ($vmHardware -eq "Ok"){
				Write-Host $vm "is up to date" -ForegroundColor Green
				ConvertTo-Template $vm
			}
			else{Write-Host "Hardware is old" -ForegroundColor Red
				if(PowerOn-VM $vm -eq "Ok"){
					Write-Host "PowerOn Complete" -ForegroundColor Green
					sleep 10
					$vmToolsStatus = Check-ToolsStatus $vm
					
					if($vmToolsStatus -eq "Old"){
							Write-Host "The VMware Tools are old" -ForegroundColor Red
							Sleep 20
 							
							Get-VMGuest $vm | Update-Tools
							Sleep 120
							Write-Host "VMware Tools are installed on:" $vm -ForegroundColor Cyan
								
								$vmToolsStatus = Check-ToolsStatus $vm
							
								if($vmToolsStatus -eq "Ok"){
									
									$PowerOffVM = PowerOff-VM $vm
									if($PowerOffVM -eq "Ok"){
										Write-Host $vm "is down" -ForegroundColor Yellow
										
										Upgrade-VMHardware $vm
										ConvertTo-Template $vm
										Write-Host $vm "is up to date" -ForegroundColor Green
									}
								}
					
					}
					else{
						$PowerOffVM = PowerOff-VM $vm
						if($PowerOffVM -eq "Ok"){
							Upgrade-VMHardware $vm
							ConvertTo-Template $vm
							Write-Host $vm "is up to date" -ForegroundColor Green
						}	
					}
				}
			}
	}
Remove-Item $tmpfile -Confirm:$false
Disconnect-VIServer -Confirm:$false