[CmdletBinding()]
Param(
    [Parameter(Mandatory=$False)]
    [array]$ComputerName,
    [Parameter(Mandatory=$False)]
    [switch]$RunningProcesses,
    [Parameter(Mandatory=$False)]
    [switch]$ComputerInfo,
    [Parameter(Mandatory=$False)]
    [switch]$Updates,
    [Parameter(Mandatory=$False)]
    [switch]$LocalUsers,
    [Parameter(Mandatory=$False)]
    [switch]$DomainUsers,
    [Parameter(Mandatory=$False)]
    [switch]$Services
)

Import-Module ActiveDirectory

if ($ComputerName) {
    Write-Output "Gathering Information for: $($ComputerName -join ", ")"
}

if ($RunningProcesses) { getRunningProcesses }
if ($ComputerInfo) { getComputerInfo }
if ($Updates) { getUpdates }
if ($LocalUsers) { getLocalUsers }
if ($DomainUsers) { getDomainUsers }
if ($Services) { getServices }

function getRunningProcesses {
    Write-Output "Running Processes: "
    if ($ComputerName) {
        Get-Process -ComputerName $ComputerName
    } else {
        Get-Process
    }
}

function getComputerInfo {
    #Domain, CPU Manufacturer, system Manufacturer, Version, Physical Memory,
    #Max Clock Speed, Model, Computer Name
    Write-Output "Computer Info: "
    if ($ComputerName) {
        $os  = Get-WmiObject -ComputerName $ComputerName -Class Win32_OperatingSystem
        $vol = Get-WmiObject -ComputerName $ComputerName -Class Win32_Volume
        $net = Get-WmiObject -ComputerName $ComputerName -Class Win32_NetworkAdapterConfiguration | Where-Object { $_.IPAddress -ne $null }
    } else {
        $os  = Get-WmiObject -Class Win32_OperatingSystem
        $vol = Get-WmiObject -Class Win32_Volume
        $net = Get-WmiObject -Class Win32_NetworkAdapterConfiguration | Where-Object { $_.IPAddress -ne $null }
    }
    Write-Output "OS:"
    Write-Output $os
    Write-Output "Volumes:"
    Write-Output $vol
    Write-Output "NICs:"
    Write-Output $net
}

function getUpdates {
    # could use Invoke-Expression "wmic qfe list"  for wmi
    Write-Output "Currently Installed Updates: "
    if ($ComputerName) {
        Get-Hotfix -ComputerName $ComputerName
    } else {
        Get-HotFix
    }
}

function getLocalUsers {
    Write-Output "Local Users: "
    if ($ComputerName) {
        Get-ADUser -Filter * -SearchBase "dc=local" -ComputerName $ComputerName
    } else {
        Get-ADUser -Filter * -SearchBase "dc=local"
    }
}

function getDomainUsers {
    Write-Output "Domain  Users: "
    if ($ComputerName) {
        Get-ADUser -Filter * -SearchBase "dc=domain" -ComputerName $ComputerName
    } else {
        Get-ADUser -Filter * -SearchBase "dc=domain"
    }
}

function getServices {
    Write-Output "Services: "
    if ($ComputerName) {
        Get-Service -ComputerName $ComputerName
    } else {
        Get-Service
    }
}