# Look up computer name from mac address in a file
# Based on Set-ComputerName from:
# https://kristopherjturner.com/2017/02/01/automating-computer-naming-after-deploying-windows-10-images/

$FileName = "ComputerList.csv"

$scriptPath = Split-Path $script:MyInvocation.MyCommand.Path

$thisComputerMAC = Get-WmiObject win32_networkadapterconfiguration -Filter 'ipenabled = "true"' | Select-Object MACAddress
$ComputerList = Import-Csv -Path "$scriptPath\$FileName"

# look up computer name by MAC address
ForEach ($Computer in $ComputerList) {
    Write-Host "$($Computer.CN) $($Computer.MAC) $thisComputerMac" 
    If ($thisComputerMAC -match $Computer.MAC) {
        Write-Host "$($Computer.CN) matches the localhost MAC Address: $thisComputerMAC"
        $NewComputerName = $Computer.CN
    }
}

# if computer isn’t on list, ask for a name
If ($Null -eq $NewComputerName) {
    Write-Host "Computer is not found in computer list." -ForegroundColor Red
    $NewComputerName = Read-Host -Prompt "Please enter desired computer name then hit enter"
}

# rename computer
Write-Host "Computer will be renamed to $NewComputerName."
Rename-Computer -NewName $NewComputerName -Force -Verbose