# Import the required module
try {
    Import-Module ActiveDirectory -ErrorAction Stop
}
catch {
    Write-Error "Failed to import ActiveDirectory module. Error: $_"
    return
}

# Get all AD groups
try {
    $groups = Get-ADGroup -Filter * -ErrorAction Stop
}
catch {
    Write-Error "Failed to get AD groups. Error: $_"
    return
}

# Create an empty array to hold the data
$results = @()

# Loop over each group
foreach ($group in $groups) {
    # Skip the "IIS_IUSRS" group
    if ($group.Name -eq "IIS_IUSRS") {
        continue
    }

    # Get the members of the current group
    try {
        $members = Get-ADGroupMember -Identity $group -ErrorAction Stop | Where-Object {$_.objectClass -eq 'user'}
    }
    catch {
        Write-Error "Failed to get members for group $($group.Name). Error: $_"
        continue
    }

    # Check if the group has no members
    if ($members.Count -eq 0) {
        # Create a new object to represent the group with no members
        $emptyGroup = [PSCustomObject]@{
            "Group Name" = $group.Name
        }

        # Add the empty group object to the results array
        $results += $emptyGroup
    }
}

# Set the output directory and filename
$outputDir = "C:\ADAudit"
$outputFile = Join-Path -Path $outputDir -ChildPath "T. BlankADGroups.csv"

# Create the directory if it doesn't exist
if (!(Test-Path -Path $outputDir)) {
    New-Item -ItemType Directory -Path $outputDir | Out-Null
}

# Export the results to a CSV file
try {
    $results | Export-Csv -Path $outputFile -NoTypeInformation -ErrorAction Stop
}
catch {
    Write-Error "Failed to export results to CSV. Error: $_"
}