$scriptPath = split-path -parent $MyInvocation.MyCommand.Definition

function Get-RandomString {
    param([int]$Length,
          [int]$upperCase,
		  [int]$onlyNumber)

	if ($onlynumber -eq 1) {
		$set = "0123456789".ToCharArray()
	}
	else {
		$set = "abcdef0123456789".ToCharArray()
	}

    $result = ""
    for ($x = 0; $x -lt $Length; $x++) {
        $result += $set | Get-Random
    }

    if ($upperCase -eq 1) { return $result.ToUpper() }
    else { return $result }

}

function Set-HWProfileID {

    $registryPath = "Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\IDConfigDB\Hardware Profiles\0001"
    $registryKeyName = "HwProfileGuid"

    $HwProfile = Get-ItemProperty -Path $registryPath -Name $registryKeyName

    $len = $HwProfile.HwProfileGuid.Length
    $Rand1 = Get-RandomString -Length 8 -upperCase 0 -onlyNumber 0
    $Rand2 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $Rand3 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $Rand4 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $Rand5 = Get-RandomString -Length 12 -upperCase 0 -onlyNumber 0
    $RandID = "{$Rand1-$Rand2-$Rand3-$Rand4-$Rand5}"

    Set-ItemProperty -Path $registryPath -Name $registryKeyName -Value $RandID

}

function Set-ProductID {

    $registryPath = "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion"

    $registryKeyName = "ProductId"

    $HwProfile = Get-ItemProperty -Path $registryPath -Name $registryKeyName

    $len = $HwProfile.HwProfileGuid.Length
    $Rand1 = Get-RandomString -Length 5 -upperCase 0 -onlyNumber 1
    $Rand2 = Get-RandomString -Length 5 -upperCase 0 -onlyNumber 1
    $Rand3 = Get-RandomString -Length 5 -upperCase 0 -onlyNumber 1
    $Rand4 = Get-RandomString -Length 5 -upperCase 1 -onlyNumber 0
    $RandID = "$Rand1-$Rand2-$Rand3-$Rand4"

	$RandName = Get-RandomString -Length 10 -upperCase 1 -onlyNumber 0
	$InstallDate = [int][double]::Parse($(Get-Date -date (Get-Date).ToUniversalTime()-uformat %s))
	$InstallTimeRand = Get-RandomString -Length 16 -upperCase 0 -onlyNumber 1
	$InstallTime = "13$installTImeRand"


    Set-ItemProperty -Path $registryPath -Name $registryKeyName -Value $RandID
	Set-ItemProperty -Path $registryPath -Name "RegisteredOwner" -Value $RandName
	Set-ItemProperty -Path $registryPath -Name "InstallDate" -Value $InstallDate
	Set-ItemProperty -Path $registryPath -Name "InstallTime" -Value $InstallTime

}

function Set-VolID {


    $volidPath = "$scriptPath\Volumeid64.exe"
    $volID1 = Get-RandomString -Length 4 -upperCase 1 -onlyNumber 0
    $volID2 = Get-RandomString -Length 4 -upperCase 1 -onlyNumber 0
    $volidArgs = "C: $volID1-$volID2"

    $ps = New-Object System.Diagnostics.Process
    $ps.StartInfo.FileName = $volidPath
    $ps.StartInfo.Arguments = $volidArgs
    $ps.StartInfo.RedirectStandardOutput = $False
    $ps.StartInfo.UseShellExecute = $True
    $ps.StartInfo.WindowStyle = "Hidden"
    $ps.StartInfo.CreateNoWindow = $True
    $psReturnCOde = $ps.Start()

    if (-Not $ps.WaitForExit(10000)) { $ps.kill() }

}

function Set-DiskGPTID {


    $diskGPTPath = "diskpart"
    $diskGPTID1 = Get-RandomString -Length 8 -upperCase 0 -onlyNumber 0
    $diskGPTID2 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $diskGPTID3 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $diskGPTID4 = Get-RandomString -Length 4 -upperCase 0 -onlyNumber 0
    $diskGPTID5 = Get-RandomString -Length 12 -upperCase 0 -onlyNumber 0
    $diskGPTID = "$diskGPTID1-$diskGPTID2-$diskGPTID3-$diskGPTID4-$diskGPTID5"

    $diskpartScriptFile = New-Item "$scriptPath\diskpart.txt" -type file -force
    Add-Content "$scriptPath\diskpart.txt" "select disk 1"
    Add-Content "$scriptPath\diskpart.txt" "uniqueid disk id=$diskGPTID"

    sleep -Seconds 2


    $diskGPTArgs = "/s ""$scriptPath\diskpart.txt"""

    $ps = New-Object System.Diagnostics.Process
    $ps.StartInfo.FileName = $diskGPTPath
    $ps.StartInfo.Arguments = $diskGPTArgs
    $ps.StartInfo.RedirectStandardOutput = $False
    $ps.StartInfo.UseShellExecute = $True
    $ps.StartInfo.WindowStyle = "Hidden"
    $ps.StartInfo.CreateNoWindow = $True
    $psReturnCOde = $ps.Start()

    if (-Not $ps.WaitForExit(10000)) { $ps.kill() }

}

function Set-ComputerName {

    $computerNameRand1 = Get-RandomString -Length 6 -upperCase 1
    $computerNameRand = "DESKTOP-$computerNameRand1"

    Rename-Computer -ComputerName "localhost" -NewName $computerNameRand

}


$answer = Read-Host -Prompt "******** WARNING! Read careful! ******** `n `nRequirements `n 1. You are running W7 or later as 64-bit Version `n 2. Your Harddrive is formated as GPT and not MBR (check google what that means and how to check) `n `n Press [y] if you agree to continue or any other key to abort."



if ($answer -eq "y") {


    try
    {
        Write-Host "Changing HWProfile GUID..."
        Set-HWProfileID
        Write-Host "Done"
    }
    catch
    {
        Write-Host "ERROR: Could not change HWProfile GUID (run Script as Administrator)"
    }


	try
    {
        Write-Host "Changing Windows Product ID..."
        Set-ProductID
        Write-Host "Done"
    }
    catch
    {
        Write-Host "ERROR: Could not change WIndows Product ID (run Script as Administrator)"
    }


    try
    {
        Write-Host "Changing VolumeID GUID..."
        Set-VolID
        Write-Host "Done"
    }
    catch
    {
        Write-Host "ERROR: Could not change Volume GUID (run Script as Administrator)"
    }


    try
    {
        Write-Host "Changing GPT GUID..."
        ###### Does not work yet
        #Set-DiskGPTID
        Write-Host "Done"
    }
    catch
    {
        Write-Host "ERROR: Could not change GPT GUID (run Script as Administrator)"
    }

    try
    {
        Write-Host "Changing PC Name..."
        Set-ComputerName
        Write-Host "Done"
    }
    catch
    {
        Write-Host "ERROR: Could not change PC Name (run Script as Administrator)"
    }


    $answer = Read-Host -Prompt "WARNING! The PC needs a restart for changes to take effect. `n `nALSO CHANGE YOUR MAC ADDRESS AND YOUR IP!`n `nPress [y] to accept or any other key to manual restart later."

    if ($answer -eq "y") {
        Restart-Computer -Force
    }

}
else {

    Write-Host "Aborted"

}