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#----------------------Variables Used----------------------------------------
[string]$vmName = $null
[string]$vhdName = $null
[string]$vhdType = $null
[string]$path = $null
[string]$vhdPath = $null
[int64]$vhdSize = $null
[string]$dynamic = $null
[string]$confirm = $null
#--------------------END Variables Used--------------------------------------
 
#----------------------USER PROMPTS------------------------------------------
$vmName = Read-Host "Enter name of VM to create new VHD for"
#check to ensure VM actually exists on the local Hyp
$vms = Get-VM | Select-Object -ExpandProperty Name
if($vmName -like $vms){
    #vm was found, we can continue with questions
    $vhdName = Read-Host "Enter name of new .vhdx file (Ex VMNameDisk4)"
    $path = Read-Host "Enter path where .vhdx will reside (Ex E:\VHD\)"
    $vhdPath = $path+$vhdName+".vhdx"
    $vhdSize = Read-Host "Enter VHDSize (GB)"
    $vhdSize = [math]::round($vhdSize *1Gb, 3) #converts GB to bytes
    while("yes","no" -notcontains $dynamic){
        $dynamic = Read-Host "Will this new VHD be dynamic? (yes/no)"
    }
    if($dynamic -eq "yes"){
        $vhdType = "Dynamic"
    }
    else{
        $vhdType = "Fixed"
    }
#-------------------END USER PROMPTS------------------------------------------
 
    #-----------------CONFIRM CREATE NEW VHD----------------
    Write-Host "Creating new VHD:" $vhdPath "(size:" $vhdSize "),"`
        "`n VHD Type:" $vhdType `
        "`n Attaching this new VHD to:" $vmName `
             -ForegroundColor Cyan
     
    while("yes","no" -notcontains $confirm){
        $confirm = Read-Host "Proceed? (yes/no)"
    }
    #---------------END CONFIRM CREATE NEW VHD--------------
    if($confirm -eq "yes"){
        #-------------NEW VHD CREATION----------------------
        #create either a fixed or dynamic vhd depending on user choice
        try{
            if($dynamic -eq "yes"){
                New-VHD -SizeBytes $vhdSize –Path $vhdPath -Dynamic -Confirm:$false
            }
        else{
            Write-Host "Creating fixed .vhdx - this could take some time..." -ForegroundColor Cyan
            New-VHD -SizeBytes $vhdSize –Path $vhdPath -Fixed -Confirm:$false
        }
        }
        catch{
            Write-Host "There was an error creating the new VHD" -ForegroundColor Red
            Write-Error $_
        }
        #----------END NEW VHD CREATION---------------------
        #--------------ATTACH NEW VHD ----------------------
        try{
 
            Add-VMHardDiskDrive -VMName $vmName -Path $vhdPath
        }
        catch{
            Write-Host "There was an error attaching the new VHD to" $vmName -ForegroundColor Red
            Write-Error $_
        }
        #------------END ATTACH NEW VHD --------------------
        #now show all VHDs that are attached to the specified VM:
        Write-Host "Final Results:" -ForegroundColor Cyan
        Write-Host "--------------" -ForegroundColor Cyan
        $vm = Get-VM -Name $vmName
        Get-VHD -VMId $vm.ID | select Path
    }
    else{
        Exit
    }
}
else{
    #vm was not found
    Write-Host "The VM you specified was not located - therefore you cannot add a VHD to it" -ForegroundColor Yellow
}