OJT-TSE

# Get logged-in user
$loggedInUser = (Get-CimInstance Win32_ComputerSystem).UserName
$username = $loggedInUser.Split("\")[-1]

# Output file
$OutputFile = "C:\Users\$username\Downloads\PC_Specs_Report-OJT-3.csv"

# ------------------------------------------------------------
# Function: Decode Windows Product Key
# ------------------------------------------------------------
function Get-WindowsProductKey {
    try {
        $keyPath = "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion"
        $digitalProductId = (Get-ItemProperty -Path $keyPath -Name DigitalProductId -ErrorAction SilentlyContinue).DigitalProductId

        if (-not $digitalProductId) { return "Not Available" }

        $chars = "BCDFGHJKMPQRTVWXY2346789"
        $hexPid = $digitalProductId[52..67]
        $result = ""

        for ($i = 24; $i -ge 0; $i--) {
            $current = 0
            for ($j = 14; $j -ge 0; $j--) {
                $current = ($current * 256) -bxor $hexPid[$j]
                $hexPid[$j] = [math]::Floor($current / 24)
                $current = $current % 24
            }
            $result = $chars[$current] + $result
        }

        return $result.Insert(5,"-").Insert(11,"-").Insert(17,"-").Insert(23,"-")
    }
    catch {
        return "Not Available"
    }
}

# ------------------------------------------------------------
# Function: Get Corporate Email (Primary Azure AD UPN)
# ------------------------------------------------------------
function Get-CorporateEmail {
    $path = "HKLM:\SOFTWARE\Microsoft\Enrollments"
    $enrollments = Get-ChildItem $path -ErrorAction SilentlyContinue

    foreach ($item in $enrollments) {
        $upn = (Get-ItemProperty -Path $item.PSPath -ErrorAction SilentlyContinue).UPN
        if ($upn) { return $upn }
    }

    return "Not Available"
}

# ------------------------------------------------------------
# Collect System Info
# ------------------------------------------------------------

$computer  = Get-CimInstance Win32_ComputerSystem
$bios      = Get-CimInstance Win32_BIOS
$baseboard = Get-CimInstance Win32_BaseBoard
$cpuInfo   = Get-CimInstance Win32_Processor
$osInfo    = Get-CimInstance Win32_OperatingSystem

# Detect device type (2 = Laptop)
$isLaptop = $computer.PCSystemType -eq 2

# Assign correct Brand/Model/Serial
if ($isLaptop) {
    $brand  = $computer.Manufacturer
    $model  = $computer.Model
    $serial = $bios.SerialNumber
    $deviceType = "Laptop"
} else {
    $brand  = $baseboard.Manufacturer
    $model  = $baseboard.Product
    $serial = $baseboard.SerialNumber
    $deviceType = "Desktop"
}

# RAM (Installed)
$ramBytes = (Get-CimInstance Win32_PhysicalMemory |
             Measure-Object -Property Capacity -Sum).Sum
$ram = [math]::Round($ramBytes / 1GB, 0)

# Physical Storage (true hardware size)
$diskBytes = (Get-CimInstance Win32_DiskDrive |
              Measure-Object -Property Size -Sum).Sum
$storage = [math]::Round($diskBytes / 1000000000, 0)

# Other Info
$hostname       = $env:COMPUTERNAME
$corporateEmail = Get-CorporateEmail
$productKey     = Get-WindowsProductKey

# ------------------------------------------------------------
# EXACT 11 Columns (Order Matters)
# ------------------------------------------------------------
$result = [PSCustomObject]@{
    CorporateEmail = $corporateEmail
    Hostname       = $hostname
    DeviceType     = $deviceType
    Brand          = $brand
    Model          = $model
    SerialNumber   = $serial
    CPU            = $cpuInfo.Name
    OS_Windows     = $osInfo.Caption
    RAM_GB         = "$ram GB"
    Storage_GB     = "$storage GB"
    ProductKey     = $productKey
}

# Export CSV
$result | Export-Csv -Path $OutputFile -NoTypeInformation -Encoding UTF8

Write-Host "PC Spec report saved to: $OutputFile"