$null = $env:WIN_COMPUTER_NAME;
$null = $env:SETUP_SCRIPT_NAME;

# Find `winiso` installation medium
$drives = & wmic volume get "DriveLetter,Label";
$drive = $($($drives | Select-String -Pattern "winiso") -split "\s+")[0];
[xml]$unattendedConfig = $(Get-Content "$drive\Autounattend.template.xml");
$namespace = New-Object -TypeName "Xml.XmlNamespaceManager" -ArgumentList $unattendedConfig.NameTable;
$namespace.AddNamespace("ua", $unattendedConfig.DocumentElement.NamespaceURI);

function Get-PassSettings {
    [OutputType([xml])]
    param(
        [string] $passName
    )

    return $unattendedConfig.SelectSingleNode("/ua:unattend/ua:settings[@pass='$passName']", $namespace);
}

# Adjust unattended settings
$specializeSettings = Get-PassSettings "specialize";
$specializeSettings.SelectSingleNode("./ua:component[@name='Microsoft-Windows-Shell-Setup']/us:ComputerName", $namespace).InnerText = "$env:WIN_COMPUTER_NAME";

$oobeSystemSettings = Get-PassSettings "oobeSystem";
$oobeSystemSettings.SelectSingleNode("./ua:component/us:FirstLogonCommands/us:SynchronousCommand[last()]/us:CommandLine", $namespace).InnerText += "`npwsh 'PortValhalla/$env:SETUP_SCRIPT_NAME';";

Write-Warning "Attention: This program will completely wipe your current disk #1 and install Windows on it. Are you sure you want to do this?"
Read-Host -Prompt "Hit enter to continue or CTRL+C to abort"
& "$drive\setup.exe";