Function Get-ScriptDirectory {
    If ($PSISE) {
        Split-Path $PSISE.CurrentFile.FullPath
    }
    Else {
        $Global:PSScriptRoot
    }
}
##################################

#Log file info
$Today = Get-Date -Format yyyy-MM-dd
$Time = Get-Date -Format HH:mm:ss
$LogDir = "$ENV:SystemDrive\Windows\Temp"
$LogFileName = "LOG_HPBiosUpdate.log"
$LogFile = Join-Path $LogDir $LogFileName

#Start logging
Out-File $LogFile -Append -InputObject ("")
Out-File $LogFile -Append -InputObject ("")
Out-File $LogFile -Append -InputObject ("$Today - $Time")
Out-File $LogFile -Append -InputObject ("")

#Define locations
$ScriptDir = Get-ScriptDirectory
$SaveToRoot = "$ENV:SystemDrive\Windows\Temp"
$SaveToDirectory = "HP_BIOS"
$SaveToLocation = "$SaveToRoot\$SaveToDirectory"
$DownloadDir = "$($SaveToLocation)\HP_BIOS_Downloads"
$ExtractDir = "$($SaveToLocation)\HP_BIOS_Extract"

If (!(Test-Path $SaveToLocation)) {
    $null = New-Item -Path $SaveToRoot\ -Name $SaveToDirectory -ItemType "Directory" -Force
}

If (!(Test-Path $DownloadDir)) {
    $null = New-Item -Path $SaveToLocation\ -Name "HP_BIOS_Downloads" -ItemType "Directory" -Force
}

If (!(Test-Path $ExtractDir)) {
    $null = New-Item -Path $SaveToLocation\ -Name "HP_BIOS_Extract" -ItemType "Directory" -Force
}

#Define variables
$OS = "Win10"
$Category = "BIOS"
$ProductCode = (Get-WmiObject -Class Win32_BaseBoard).Product
$Model = (Get-WmiObject -Class Win32_ComputerSystem).Model
$HP_CMSL_URL = "https://ftp.hp.com/pub/caps-softpaq/cmit/release/cmsl/hp-cmsl-latest.exe"

#Detect HP BIOS PS module
Try {
    Get-HPBiosVersion | Out-Null
    Write-Host "HP Client Management Script Library already installed"
    Out-File $LogFile -Append -InputObject ("HP Client Management Script Library already installed")
}
Catch {
    Write-Host "HP Client Management Script Library not loaded"
    Write-Host "Downloading from $HP_CMSL_URL"
    Out-File $LogFile -Append -InputObject ("HP Client Management Script Library not loaded")
    Out-File $LogFile -Append -InputObject ("Downloading from $HP_CMSL_URL")
    Invoke-WebRequest -Uri $HP_CMSL_URL -OutFile "$($DownloadDir)\HP_CMSL.exe"
    Write-Host "Installing HP Client Management Script Library from $($DownloadDir)\HP_CMSL.exe"
    Out-File $LogFile -Append -InputObject ("Installing HP Client Management Script Library from $($DownloadDir)\HP_CMSL.exe")
    Start-Process -FilePath "$($DownloadDir)\HP_CMSL.exe" -ArgumentList "/Silent /NoCancel /NoRestart /CloseApplications /Log" -Wait
    Write-Host "Finished downloading and installing HP Client Management Script Library"
    Out-File $LogFile -Append -InputObject ("Finished downloading and installing HP Client Management Script Library")
}

#Get BIOS info
$CurrentBIOS = Get-HPBiosVersion
Write-Host "Currently installed BIOS: version $($CurrentBIOS)"
Write-Host "Checking product code $($ProductCode) for BIOS updates"
Out-File $LogFile -Append -InputObject ("Currently installed BIOS: version $($CurrentBIOS)")
Out-File $LogFile -Append -InputObject ("Checking product code $($ProductCode) for BIOS updates")
$BIOS = Get-SoftpaqList -Platform $ProductCode -Os $OS -Category $Category
$MostRecent = ($BIOS | Measure-Object -Property "ReleaseDate" -Maximum).Maximum
$BIOS = $BIOS | Where "ReleaseDate" -eq "$MostRecent"

If ([VERSION]$CurrentBIOS -ge [VERSION]$BIOS.Version) {
    Write-Host "BIOS already current"
    Out-File $LogFile -Append -InputObject ("BIOS already current")
}
Else {
    Write-Host "Updated BIOS available: version $([VERSION]$BIOS.Version)"
    Out-File $LogFile -Append -InputObject ("Updated BIOS available: version $([VERSION]$BIOS.Version)")

    #Create folders
    $DownloadPath = "$($DownloadDir)\$($Model)\$($BIOS.Version)"
    $ExtractPath = "$($ExtractDir)\$($Model)\$($BIOS.Version)"

    If (!(Test-Path $DownloadPath)) {
        $null = New-Item $DownloadPath -ItemType Directory -Force
    }

    If (!(Test-Path $ExtractPath)) {
        $null = New-Item $ExtractPath -ItemType Directory -Force
    }

    #Download BIOS files
    $BIOS_CVA = "$($DownloadPath)\$($BIOS.Id).cva"
    $BIOS_HTML = "$($DownloadPath)\$($BIOS.Id).html"
    $BIOS_EXE = "$($DownloadPath)\$($BIOS.Id).exe"
    $BIOS_TXT = "$($DownloadPath)\$($BIOS.ReleaseDate).txt"
    Write-Host "Downloading BIOS update for model $($Model) / product $($ProductCode) to $($DownloadPath)"
    Out-File $LogFile -Append -InputObject ("Downloading BIOS update for model $($Model) / product $($ProductCode) to $($DownloadPath)")
    Get-Softpaq -Number $BIOS.Id -SaveAs $BIOS_EXE -Verbose
    Write-Host "Downloading BIOS CVA file to $BIOS_CVA"
    Out-File $LogFile -Append -InputObject ("Downloading BIOS CVA file to $BIOS_CVA")
    Invoke-WebRequest -Uri $BIOS.MetaData -OutFile $BIOS_CVA
    Write-Host "Downloading BIOS HTML file to $BIOS_HTML"
    Out-File $LogFile -Append -InputObject ("Downloading BIOS HTML file to $BIOS_HTML")
    Invoke-WebRequest -Uri $BIOS.ReleaseNotes -OutFile $BIOS_HTML
    Write-Host "Writing README file with BIOS info to $BIOS_TXT"
    Out-File $LogFile -Append -InputObject ("Writing README file with BIOS info to $BIOS_TXT")
    $BIOS | Out-File -FilePath $BIOS_TXT

    #Extract BIOS files
    Write-Host "Extracting downloaded BIOS file to $($ExtractPath)"
    Out-File $LogFile -Append -InputObject ("Extracting downloaded BIOS file to $($ExtractPath)")
    Start-Process $BIOS_EXE -ArgumentList "-pdf -e -s -f$($ExtractPath)" -Wait

    #Suspend Bitlocker
    If ((Get-BitLockerVolume -MountPoint "$ENV:SystemDrive").VolumeStatus -eq "FullyDecrypted") {
        Write-Host "Bitlocker not enabled"
        Out-File $LogFile -Append -InputObject ("Bitlocker not enabled")
    }
    Else {
        Write-Host "Suspending Bitlocker"
        Out-File $LogFile -Append -InputObject ("Suspending Bitlocker")
        Suspend-BitLocker -MountPoint "$ENV:SystemDrive" -RebootCount 1
    }

    #Search CVA to find path of executable that should be used to install the new BIOS version
    Write-Host "Looking for executable that should be used to install the new BIOS version in CVA file"
    Out-File $LogFile -Append -InputObject ("Looking for executable that should be used to install the new BIOS version in CVA file")
    $CVA_Install_Command = Get-Content $BIOS_CVA | Where { $_ -like "*SilentInstall*" }
    $CVA_Install_EXE = $CVA_Install_Command | % { $_.Split('"')[1] }
    Write-Host "Install command from CVA found: $CVA_Install_EXE"
    Out-File $LogFile -Append -InputObject ("Install command from CVA found: $CVA_Install_EXE")

    #Run update command with password file support
    $Updater_EXE = "$ExtractPath\$CVA_Install_EXE"
    $BIOS_PW = "$ScriptDir\Password\HP_BIOS_PW.bin"
    If (Get-HPBiosSetupPasswordIsSet) {
        Write-Host "BIOS password protection detected"
        Out-File $LogFile -Append -InputObject ("BIOS password protection detected")
        If (!(Test-Path $BIOS_PW)) {
            Write-Host "HP BIOS password file missing: $BIOS_PW not found" -ForegroundColor Yellow
            Out-File $LogFile -Append -InputObject ("HP BIOS password file missing: $BIOS_PW not found")
        }
        Write-Host "Using $CVA_Install_EXE to Flash BIOS with arguments -s -r -b -l -p"
        Out-File $LogFile -Append -InputObject ("Using $CVA_Install_EXE to Flash BIOS with Args -s -r -b -l -p")

        #Flash BIOS
        Write-Host "Command = $Updater_EXE -s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log -p$($BIOS_PW)"
        Out-File $LogFile -Append -InputObject ("Command = $Updater_EXE -s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log -p$($BIOS_PW)")
        Start-Process $Updater_EXE -ArgumentList "-s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log -p$($BIOS_PW)" -Wait
    }
    Else {
        Write-Host "BIOS password protection not detected"
        Write-Host "Using $CVA_Install_EXE to Flash BIOS with Args -s -r -b -l"
        Out-File $LogFile -Append -InputObject ("BIOS password protection not detected")
        Out-File $LogFile -Append -InputObject ("Using $CVA_Install_EXE to Flash BIOS with arguments -s -r -b -l")

        #Flash BIOS
        Write-Host "Command = $Updater_EXE -s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log"
        Out-File $LogFile -Append -InputObject ("Command = $Updater_EXE -s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log)")
        Start-Process $Updater_EXE -ArgumentList "-s -r -b -l$($SaveToRoot)\HPBIOSUpdate.log" -Wait
    }

    #Cleanup update files
    # Write-Host "Removing folder $SaveToLocation to cleanup install files"
    # Out-File $LogFile -Append -InputObject ("Removing folder $SaveToLocation to cleanup install files")
    # Remove-Item -Recurse -Force $SaveToLocation -ErrorAction SilentlyContinue

    #Notify user
    Write-Host "HP BIOS update applied, will install after next reboot" -ForegroundColor Green
    Out-File $LogFile -Append -InputObject ("HP BIOS update applied, will install after next reboot")
    Sleep 5
}