param([ValidateNotNullOrEmpty()][String]$credential=$(throw "*** AD credential is mandatory. e.g. -credential ad1\kyle"));

# Install targets, machine names in quotes as they appear in AD.
$install_targets= @("CC-NOAH-TEST", "CC-KYLE-CUBE");
$command = {
		$service = Get-Service -Name CyberCrucibleAgent -ErrorAction SilentlyContinue; 
		if ($service.Length -eq 0) {
				# No service exists
				$OutputFilePath="\\DC001\cr\CC-Installer-2024-8-11-T0-23.exe";
				#Start-Process -wait calc.exe # Test value, useful for trying on one machine.
				Start-Process -NoNewWindow -FilePath ${OutputFilePath} -ArgumentList "--eula-accept", "--term", "--group-id", "${GroupId}", "--install-path", "`"C:\Program Files\CyberCrucible`"", "--client", "${ClientAuth}", "--rest-pub-key", "ZUSMPfrngi0d1RTRmi8zJOf1L4AnFu3wN7lnVEb09rY=", "--rest-pub-key", "Y74s8bg+cUS1iEPHSiOJntt9EOg+qshHT/KU0Xkq/9M=", "--rest-pub-key", "ym9awfVnv1nKCfrWF7xrjq/E81H20pix6yShr+zZCJ4=" -wait
		}
}

# Lazy O(n) check for name. If efficiency over O(n) is needed, consider sorting 
# $install_targets first, or implementing a O(log(n)) binary search.
function is_install_target($name) {
  foreach ($target in $install_targets) {
    if ($target -eq $name) {
      return $true;
    }
  }
  return $false;
}

function main() {
	if ($credential -eq $null) {
        echo "You must run this script with -credential <cred> e.g. -credential ad1\kyle";
        exit(-1);
	}

    # Gets all computers joined to the domain, we are not concerned with filters here,
    # since the $install_targets will further filter based on netbios name
    $computers=get-adcomputer -filter *;
    
    $total_in_domain = $computers.Length;
    echo "$total_in_domain total computers found in the domain.";
    
    $matching = @(); 
    foreach ($pc in $computers)  {
        if (is_install_target($pc.Name)) {
		    $matching += $pc;
        }
    }
	$num_matching = $matching.Length;
    if ($num_matching -gt 0) {
        echo "$num_matching match the provided list of targets.";
		echo "";
    } else {
        echo "No computers on the domain matched the given list of install targets.";
        exit(1);
    }
    echo "Checking online status...";
	$online = @();
	foreach ($pc in $matching) {
		$name = $pc.Name;
	    Write-Host -NoNewLine "    Checking $name... ";
        if (Test-Connection -ComputerName $name -Quiet -Count 1 -ErrorAction SilentlyContinue) {
            echo "online";
			$online += $pc;
        } else {
            echo "failed to establish ICMP ping";
        }
	}
	$num_online = $online.Length;
	if ($num_online -gt 0) {
	    echo "$num_online / $num_matching matching machines were online.";
	} else {
	    echo "No matching computers were able to be connected to via ICMP. Cannot continue.";
	    exit(2);
	}
	echo "";
	echo "Pushing installer to each machine... using credential $credential";
	$online_machine_names = "";
	foreach ($pc in $online) {
        if ($online_machine_names.Length -gt 0) {
		    $online_machine_names += ", ";
		}
		$name = $pc.Name;
		$online_machine_names += $name;
	}

    invoke-command $online_machine_names -ScriptBlock $command -Credential $credential -verbose
}

main;