param([Parameter(Mandatory)] [String] $package_url)

function Retry-Download{
    [cmdletbinding()]
    param([parameter(ValueFromPipeline)][ValidateNotNullorEmpty()][string]$url,
          [ValidateNotNullorEmpty()][string]$storageDir="C:\\Windows\\Temp",
          [ValidateNotNullorEmpty()][int]$maxDownloadAttemptsCount=20)
    begin{
        # We need this change to be able to make requests to urls (e.g. http://hfs-public.secureserver.net), as non-encrypted requests are blocked
        [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls11 -bor [System.Net.SecurityProtocolType]::Tls12;
        $webclient = New-Object System.Net.WebClient
    }
    Process  {
        $filename=$url.Substring($url.LastIndexOf('/')+1)
        if($filename.indexof('?') -gt -1){
            $filename=$filename.split('?')[0]
        }
        $file = "$storageDir\\$filename"
        $count=0
        do{
            $lastErrMsg=""
            start-sleep -seconds ($count*10)
            "Downloading: $file   Attempt: $($count+1)"
            try{
                $webclient.DownloadFile($url,$file)
            }catch{
                $lastErrMsg=$_.Exception.Message
                "$lastErrMsg"
            }
            $count++
        }while(($count -lt $maxDownloadAttemptsCount) -and (($lastErrMsg -like "*The remote name could not be resolved:*") -or ($lastErrMsg -like "*Unable to connect to the remote server*") -or ($lastErrMsg -like "*The remote server returned an error: (404) Not Found.*")))
        if($lastErrMsg -ne ""){
            "$lastErrMsg"
        }
    }
}

# Remove mount to ISO - in case previous attempt failed
Dismount-DiskImage -ImagePath "C:\\Windows\\Temp\\virtio-win.iso"

Retry-Download $package_url
Mount-DiskImage -ImagePath "C:\\Windows\\Temp\\virtio-win.iso"

$driveLetter=gwmi Win32_LogicalDisk | Where {$_.DriveType -eq 5 -and $_.VolumeName -like 'virtio-win*'} | select -ExpandProperty DeviceId

# Install qemu agent
Start-Process msiexec.exe -Wait -ArgumentList "/I ${driveLetter}\guest-agent\qemu-ga-x86_64.msi /quiet /norestart" -NoNewWindow

# Remove mount to ISO
Dismount-DiskImage -ImagePath "C:\\Windows\\Temp\\virtio-win.iso"

# Enable qemu to start on boot
Set-Service QEMU-GA -StartupType Automatic