param(
    [validatescript({ Test-Path $_ -PathType Any })]
    [system.io.fileinfo]$in,
    $out = (Split-Path -Parent $in),
    $scale = 128
)

if (!(Get-Command "magick.exe" -ErrorAction SilentlyContinue)) {
    Write-Host "There's no magick.exe to work with!"
    exit
}

if (Test-Path $in -PathType container) {
    $out_dir = "$out\x$scale\"
    if (!(Test-Path $out_dir)) {
        New-Item "$out_dir" -ItemType directory
    }
    foreach ($image in Get-ChildItem "$in*" -Include *.png) {
        $scaled = "$out_dir$($image.BaseName)$($image.Extension)"
        Write-Host $scaled
        magick $image.FullName -scale "$($scale * 100)%" $scaled
    }
}
else {
    $scaled = "$out\$($in.BaseName)-x$scale$($in.Extension)"
    Write-Host $scaled
    magick $in.FullName -scale "$($scale * 100)%" $scaled
}