function Get-CIM_WMI_PropertyValueIDName

function Get-CIM_WMI_PropertyValueIDName
    {
    <#
    CBH goes here

    .NOTES
        original idea = u/SeeminglyScience
        post = SeeminglyScience comments on is there a builtin enum for "PCSystemType"?
        Post URL = https://www.reddit.com/r/PowerShell/comments/8jdczz/is_there_a_builtin_enum_for_pcsystemtype/dyzw5fq/
    #>

    [CmdletBinding ()]
    Param (
        [Parameter (
            Position = 0,
            Mandatory)]
            [string]
            $ClassName,

        [Parameter (
            Position = 1,
            Mandatory)]
            [string]
            $PropertyName,

        [Parameter (
            Position = 2,
            Mandatory)]
            [int]
            $PropertyValueID
        )

    $ClassProperties = Get-CimInstance -ClassName $ClassName -ErrorAction Ignore
    # if the $ClassName or $PropertyName are invlaid, return $Null
    if (([string]::IsNullOrEmpty($ClassProperties)) -or
        ($ClassProperties.PSObject.Properties.Name -notcontains $PropertyName))
        {
        return $Null
        }

    # the CIM_* classes seem to lack many of the LocalizedQualifiers
    #    that means the CreationClass appears to be required
    #    the usual result is CIM_* becomes Win32_*
    $CreationClassName = $ClassProperties.CreationClassName

    $Session = [CimSession]::Create('LocalHost')

    # Add operation options that retrieve localized values for mappings
    $OperationOptions = [Microsoft.Management.Infrastructure.Options.CimOperationOptions]@{
        Flags = [Microsoft.Management.Infrastructure.Options.CimOperationFlags]::LocalizedQualifiers
        }

    $PropertyInfo = $Session.
        GetClass('ROOT/CIMV2', $CreationClassName, $OperationOptions).
        CimClassProperties[$PropertyName]

    # finally found a PropertyID that is NOT a direct index into Values
    #    it's Win32_OperatingSystem ProductType
    #    the ValueMap = 1,2,3
    #    the Values = 'Work Station', 'Domain Controller', 'Server'
    $ValueMap = $PropertyInfo.Qualifiers['ValueMap'].Value
    $Values = $PropertyInfo.Qualifiers['Values'].Value

    # check to see if there is a ValueMap
    if (($ValueMap) -and
        ($ValueMap -contains "$PropertyValueID"))
        {
        # if yes, the ID needs to be a numeric string, not an INT
        $Values[$ValueMap.IndexOf("$PropertyValueID")]
        }
        # check for out-of-bounds index
        elseif ($PropertyValueID -in 0..$Values.GetUpperBound(0))
        {
        $Values[$PropertyValueID]
        }
        else
        {
        return $Null
        }

    $Session.Dispose()

    } # end >> function Get-CIM_WMI_PropertyValueIDName


# this should return "Desktop"
Get-CIM_WMI_PropertyValueIDName -ClassName Win32_ComputerSystem -PropertyName PCSystemType -PropertyValueID 1

# these otta return $Null
Get-CIM_WMI_PropertyValueIDName -ClassName Win32_ComputerSystem -PropertyName PCSystemType -PropertyValueID 666
Get-CIM_WMI_PropertyValueIDName -ClassName CIM_ComputerSystem -PropertyName FAKE_PropName -PropertyValueID 1
Get-CIM_WMI_PropertyValueIDName -ClassName FAKE_ClassName -PropertyName WakeUpType -PropertyValueID 1

# this one otta return "Work Station"
Get-CIM_WMI_PropertyValueIDName CIM_OperatingSystem ProductType 1