winutil/functions/public/Invoke-WPFGetIso.ps1

function Invoke-WPFGetIso {
    <#
    .DESCRIPTION
    Function to get the path to Iso file for MicroWin, unpack that isom=, read basic information and populate the UI Options
    #>

    Write-Host "Invoking WPFGetIso"

    if($sync.ProcessRunning){
        $msg = "GetIso process is currently running."
        [System.Windows.MessageBox]::Show($msg, "Winutil", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Warning)
        return
    }

    Write-Host "         _                     __    __  _         "
	Write-Host "  /\/\  (_)  ___  _ __   ___  / / /\ \ \(_) _ __   "
	Write-Host " /    \ | | / __|| '__| / _ \ \ \/  \/ /| || '_ \  "
	Write-Host "/ /\/\ \| || (__ | |   | (_) | \  /\  / | || | | | "
	Write-Host "\/    \/|_| \___||_|    \___/   \/  \/  |_||_| |_| "

    $oscdimgPath = Join-Path $env:TEMP 'oscdimg.exe'   
    $oscdImgFound = [bool] (Get-Command -ErrorAction Ignore -Type Application oscdimg.exe) -or (Test-Path $oscdimgPath -PathType Leaf)
    Write-Host "oscdimg.exe on system: $oscdImgFound"
    
    if (!$oscdImgFound) 
    {
        $downloadFromGitHub = $sync.WPFMicrowinDownloadFromGitHub.IsChecked

        if (!$downloadFromGitHub) 
        {
            # only show the message to people who did check the box to download from github, if you check the box 
            # you consent to downloading it, no need to show extra dialogs
            [System.Windows.MessageBox]::Show("oscdimge.exe is not found on the system, winutil will now attempt do download and install it using choco. This might take a long time.")
            # the step below needs choco to download oscdimg
            $chocoFound = [bool] (Get-Command -ErrorAction Ignore -Type Application choco)
            Write-Host "choco on system: $chocoFound"
            if (!$chocoFound) 
            {
                [System.Windows.MessageBox]::Show("choco.exe is not found on the system, you need choco to download oscdimg.exe")
                return
            }

            Start-Process -Verb runas -FilePath powershell.exe -ArgumentList "choco install windows-adk-oscdimg"
            [System.Windows.MessageBox]::Show("oscdimg is installed, now close, reopen PowerShell terminal and re-launch winutil.ps1")
            return
        }
        else {
            [System.Windows.MessageBox]::Show("oscdimge.exe is not found on the system, winutil will now attempt do download and install it from github. This might take a long time.")
            Get-Oscdimg -oscdimgPath $oscdimgPath
            $oscdImgFound = Test-Path $oscdimgPath -PathType Leaf
            if (!$oscdImgFound) {
                $msg = "oscdimg was not downloaded can not proceed"
                [System.Windows.MessageBox]::Show($msg, "Winutil", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Error)
                return
            }
            else {
                Write-Host "oscdimg.exe was successfully downloaded from github"
            }
        }
    }

    [System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") | Out-Null
    $openFileDialog = New-Object System.Windows.Forms.OpenFileDialog
    $openFileDialog.initialDirectory = $initialDirectory
    $openFileDialog.filter = "ISO files (*.iso)| *.iso"
    $openFileDialog.ShowDialog() | Out-Null
    $filePath = $openFileDialog.FileName

    if ([string]::IsNullOrEmpty($filePath))
    {
        Write-Host "No ISO is chosen"
        return
    }

    Write-Host "File path $($filePath)"
    if (-not (Test-Path -Path $filePath -PathType Leaf))
    {
        $msg = "File you've chosen doesn't exist"
        [System.Windows.MessageBox]::Show($msg, "Winutil", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Error)
        return
    }

    Write-Host "Mounting Iso. Please wait."
    $mountedISO = Mount-DiskImage -PassThru "$filePath"
    Write-Host "Done mounting Iso $mountedISO"
    $driveLetter = (Get-Volume -DiskImage $mountedISO).DriveLetter
    Write-Host "Iso mounted to '$driveLetter'"
    # storing off values in hidden fields for further steps
    # there is probably a better way of doing this, I don't have time to figure this out
    $sync.MicrowinIsoDrive.Text = $driveLetter

    Write-Host "Setting up mount dir and scratch dirs"
    $timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
    $randomNumber = Get-Random -Minimum 1 -Maximum 9999
    $randomMicrowin = "Microwin_${timestamp}_${randomNumber}"
    $randomMicrowinScratch = "MicrowinScratch_${timestamp}_${randomNumber}"
    $mountDir = Join-Path $env:TEMP $randomMicrowin
    $scratchDir = Join-Path $env:TEMP $randomMicrowinScratch
    $sync.MicrowinMountDir.Text = $mountDir
    $sync.MicrowinScratchDir.Text = $scratchDir
    Write-Host "Done setting up mount dir and scratch dirs"
    Write-Host "Scratch dir is $scratchDir"
    Write-Host "Image dir is $mountDir"

    try {
        
        #$data = @($driveLetter, $filePath)
        New-Item -ItemType Directory -Force -Path "$($mountDir)" | Out-Null
        New-Item -ItemType Directory -Force -Path "$($scratchDir)" | Out-Null
        Write-Host "Copying Windows image. This will take awhile, please don't use UI or cancel this step!"
        
        # xcopy we can verify files and also not copy files that already exist, but hard to measure
        # xcopy.exe /E /I /H /R /Y /J $DriveLetter":" $mountDir >$null
        $totalTime = Measure-Command { Copy-Files "$($driveLetter):" $mountDir -Recurse -Force }
        Write-Host "Copy complete! Total Time: $($totalTime.Minutes)m$($totalTime.Seconds)s"

        $wimFile = "$mountDir\sources\install.wim"
        Write-Host "Getting image information $wimFile"

        if (-not (Test-Path -Path $wimFile -PathType Leaf))
        {
            $msg = "Install.wim file doesn't exist in the image, this could happen if you use unofficial Windows images, or a Media creation tool, which creates a final image that can not be modified. Please don't use shady images from the internet, use only official images. Here are instructions how to download ISO images if the Microsoft website is not showing the link to download and ISO. https://www.techrepublic.com/article/how-to-download-a-windows-10-iso-file-without-using-the-media-creation-tool/"
            Write-Host $msg
            [System.Windows.MessageBox]::Show($msg, "Winutil", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Error)
            throw
        }
        Get-WindowsImage -ImagePath $wimFile | ForEach-Object {
            $imageIdx = $_.ImageIndex
            $imageName = $_.ImageName
            $sync.MicrowinWindowsFlavors.Items.Add("$imageIdx : $imageName")
        }
        $sync.MicrowinWindowsFlavors.SelectedIndex = 0
        Get-Volume $driveLetter | Get-DiskImage | Dismount-DiskImage
        Write-Host "Selected value '$($sync.MicrowinWindowsFlavors.SelectedValue)'....."

        $sync.MicrowinOptionsPanel.Visibility = 'Visible'
    } catch {
        Write-Host "Dismounting bad image..."
        Get-Volume $driveLetter | Get-DiskImage | Dismount-DiskImage
        Remove-Item -Recurse -Force "$($scratchDir)"
        Remove-Item -Recurse -Force "$($mountDir)"
    }

    Write-Host "Done reading and unpacking ISO"
    Write-Host ""
    Write-Host "*********************************"
    Write-Host "Check the UI for further steps!!!"

    $sync.ProcessRunning = $false
}