# Remove-DotNetCore31.ps1
# Removes unsupported Microsoft .NET Core / ASP.NET Core / Windows Desktop Runtime / SDK 3.1.x components

$ErrorActionPreference = "Continue"

Write-Output "Starting .NET Core 3.1 remediation..."

$registryPaths = @(
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*",
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
)

$targetApps = foreach ($path in $registryPaths) {
    Get-ItemProperty $path -ErrorAction SilentlyContinue | Where-Object {
        (
            $_.DisplayName -match "Microsoft \.NET.*3\.1\." -or
            $_.DisplayName -match "Microsoft ASP\.NET Core.*3\.1\." -or
            $_.DisplayName -match "Microsoft Windows Desktop Runtime.*3\.1\."
        ) -and
        $_.UninstallString
    }
}

if (-not $targetApps) {
    Write-Output "No .NET Core 3.1 components found. Nothing to remove."
    exit 0
}

foreach ($app in $targetApps) {
    Write-Output "Found: $($app.DisplayName) $($app.DisplayVersion)"
}

foreach ($app in $targetApps) {
    Write-Output "Attempting to remove: $($app.DisplayName) $($app.DisplayVersion)"

    $uninstallString = $app.UninstallString

    if ($uninstallString -match "\{[A-Fa-f0-9\-]{36}\}") {
        $productCode = $Matches[0]
        Write-Output "Using MSI product code: $productCode"
        Start-Process -FilePath "msiexec.exe" -ArgumentList "/x $productCode /qn /norestart" -Wait
    }
    else {
        Write-Output "No MSI product code found for $($app.DisplayName). Skipping."
    }
}

Write-Output "Verifying remaining .NET Core 3.1 components..."

$remainingApps = foreach ($path in $registryPaths) {
    Get-ItemProperty $path -ErrorAction SilentlyContinue | Where-Object {
        (
            $_.DisplayName -match "Microsoft \.NET.*3\.1\." -or
            $_.DisplayName -match "Microsoft ASP\.NET Core.*3\.1\." -or
            $_.DisplayName -match "Microsoft Windows Desktop Runtime.*3\.1\."
        ) -and
        $_.UninstallString
    }
}

if ($remainingApps) {
    Write-Output "Some .NET Core 3.1 components may still remain:"
    $remainingApps | ForEach-Object {
        Write-Output "$($_.DisplayName) $($_.DisplayVersion)"
    }
    exit 1
}
else {
    Write-Output ".NET Core 3.1 components removed successfully."
    exit 0
}