Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Bypass -Force
function RXUninstallQualysAgent {
    #start: global variables
    $ScriptDir = Get-Location
    $homepath = Get-ChildItem -Path "$ScriptDir" #setting up folder directory variable based on $ScriptDir
    #end: global variables
    #removes existing RXUninstallQualysAgentResult.txt pior running all checks
    if ($homepath.Name -eq "RXUninstallQualysAgentResult.txt") {
        Get-ChildItem -Path $ScriptDir\RXUninstallQualysAgentResult.txt | Remove-Item -Force
    }
    #check required script
    if ($ScriptDir.Name -eq 'RXUninstallQualysAgent_module.ps1') {
        Write-host "Required script found."
    }
    else {
        Write-Host 'Required script not found!'
        Start-Sleep 2
        Write-Host 'Downloading required script from Cloud'
        Invoke-WebRequest -Uri 'url.domain.com' `
            -OutFile "$ScriptDir\RXUninstallQualysAgent_module.ps1"

    }
    Get-PSSession | Remove-PSSession -ErrorAction Ignore #removes any active powershell remote session
    #start: text file test
    Write-Host "`nFinding RXUninstallQualysAgentTarget.txt..."
    if ($homepath.Name -eq "RXUninstallQualysAgentTarget.txt") {
        Start-Sleep -Seconds 2 
        Write-Host "PASSED: RXUninstallQualysAgentTarget.txt is found." -ForegroundColor Green
        #start: connectivity test
        Write-Host "`nValidating VPN connectivity..."
        $corp_lan = Test-Connection -ComputerName "domain.com" -Count 2 -ErrorAction Ignore
        if ($corp_lan.StatusCode -eq "0") {
            Start-Sleep -Seconds 2
            Write-Host "PASSED: PC is connected to VPN." -ForegroundColor Green
            #start: credential test
            Write-Host "`nValidating credentials..."
            try {
                $creds = Get-Credential -Message "FORMAT: domain\a-account" -ErrorAction Stop
                $psremote = New-PSSession -ComputerName "REXEU1MANP004.b2b.regn.net" `
                    -Credential $creds -ErrorAction Ignore #creating powershell remote session
                if ($psremote.ComputerName -eq "server.domain.com") {
                    Start-Sleep -Seconds 2
                    Write-Host "PASSED: Credentials are valid." -ForegroundColor Green
                    Invoke-Command -Session $psremote -ScriptBlock { if ((Get-ChildItem -Path "C:\").Name -eq "rxtemp") {} }
                    if ((Get-ChildItem -Path "C:\").Name -eq "rxtemp") {
                        $remotecommand_uninstall = { Invoke-Command -ScriptBlock { c:\RXtemp\RXUninstallQualysAgent_module.ps1 } `
                                -Credential $using:creds } #command to run on remote host
                        Copy-Item -Path $ScriptDir\RXUninstallQualysAgent_module.ps1 -ToSession $psremote `
                            -Destination "C:\RXtemp" #copy script module
                        Copy-Item -Path $ScriptDir\RXUninstallQualysAgentTarget.txt -ToSession $psremote `
                            -Destination "C:\RXtemp" #copy target file
                        Write-Host "`nUninstalling Qualys agent..."    
                        Invoke-Command -Session $psremote -ScriptBlock $remotecommand_uninstall
                        Copy-Item -FromSession $psremote "C:\rxtemp\RXUninstallQualysAgentResult.txt" -Destination "$ScriptDir\"
                        Write-Host "`nCOMPLETED: Result extract can be found at $ScriptDir\RXUninstallQualysAgentResult.tx" -ForegroundColor Yellow
                        Start-Sleep -Seconds 8
                    }
                    else {
                        Invoke-Command -Session  $psremote -ScriptBlock { New-Item -Path "c:\" -Name "RXtemp" -ItemType Directory} -Credential $creds
                        $remotecommand_uninstall = { Invoke-Command -ScriptBlock { c:\temp\RXUninstallQualysAgent_module.ps1 }`
                                -Credential $using:creds } #command to run on remote host
                        Copy-Item -Path $ScriptDir\RXUninstallQualysAgent_module.ps1 -ToSession $psremote `
                            -Destination "C:\RXtemp" #copy script module
                        Copy-Item -Path $ScriptDir\RXUninstallQualysAgentTarget.txt -ToSession $psremote `
                            -Destination "C:\RXtemp" #copy target file
                        Write-Host "`nUninstalling Qualys agent..."    
                        Invoke-Command -Session $psremote -ScriptBlock $remotecommand_uninstall
                        Copy-Item -FromSession $psremote "c:\rxtemp\RXUninstallQualysAgentResult.txt" -Destination "$ScriptDir\"
                        Write-Host "`nCOMPLETED: Result extract can be found at $ScriptDir\RXUninstallQualysAgentResult.tx" -ForegroundColor Yellow
                        Start-Sleep -Seconds 8
                    }
                }
                #end: credential test
                else {
                    Start-Sleep -Seconds 2
                    Write-Host "FAILED: Wrong password/user name. Please try again." -ForegroundColor Red
                    Start-Sleep -Seconds 8  
                }  
                ##+
            }
            catch {
                Write-Host "FAILED: Blank password/user name. Please try again." -ForegroundColor Red
                Start-Sleep -Seconds 8
            }    
        }
        #end: connectivity test
        else {
            Start-Sleep -Seconds 2
            Write-Host "FAILED: Please connect first to VPN and try again." -ForegroundColor Red
            Start-Sleep -Seconds 8
        }
    }
    #end: text file test
    else {
        Start-Sleep -Seconds 2 
        Write-Host "FAILED: RXUninstallQualysAgentTarget.txt not found." -ForegroundColor Red
        Write-Host "Make sure RXUninstallQualysAgentTarget.txt is present where this script is run." -ForegroundColor Red
        Start-Sleep -Seconds 5
    }
    Get-PSSession | Remove-PSSession -ErrorAction Ignore #removes any active powershell remote session
}
RXUninstallQualysAgent #function call