# Update-Firefox
# ----------------------------------------------------------------------------
# This Script installs the current Firefox version
#
# Returns: - 
# ----------------------------------------------------------------------------
# Copyright (c) 2024 by Digital Data GmbH
#
# Digital Data GmbH • Ludwig-Rinn-Strasse 16 • D-35452 Heuchelheim
# Tel.: 0641/202360 • E-Mail: info-flow@digitaldata.works
# ----------------------------------------------------------------------------
# Creation Date / Author:    04.11.2024 / MK
# Version Date / Editor:     04.11.2024 / MK
# Version Number:            1.0.0.0

#Requires –Version 4.0

Clear-Host

Function Get-CurrentFirefoxVersion {
	$CurrentFirefoxVersion = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Mozilla\Mozilla Firefox" -Name "(default)" -ErrorAction SilentlyContinue)."(default)" 
	Write-Host "Current Firefox Version: $CurrentFirefoxVersion"
	Return $CurrentFirefoxVersion
} #end function

Function Get-NewFirefoxVersion {
	# Fetch the content of the Firefox release notes page
	$response = Invoke-WebRequest -Uri "https://www.mozilla.org/de/firefox/notes/"
	$pageContent = $response.Content

	# Extract the version number using a regular expression
	if ($pageContent -match '<title>Firefox\s+([0-9]+\.[0-9]+),\s+See\s+All\s+New\s+Features,\s+Updates\s+and\s+Fixes<\/title>') {
	    $NewFirefoxVersion = $matches[1]
	    Write-Host "Latest Firefox Version: $latestVersion"
		Return $NewFirefoxVersion
	} else {
	    Write-Host "Could not find the Firefox version number on the release notes page."
		Return $NULL
	}
} #end function

Function Update-NewFirefoxVersion {
	Param ($NewFirefoxVersion)

    # Define the URL for the latest Firefox installer
    $NewFirefoxVersionURL = "https://download-installer.cdn.mozilla.net/pub/firefox/releases/$NewFirefoxVersion/win64/de/Firefox%20Setup%20$NewFirefoxVersion.msi"
    
    # Use Invoke-WebRequest to download the installer
	Write-Host "Downloading Firefox Version $NewFirefoxVersion..."
    Invoke-WebRequest -Uri $NewFirefoxVersionURL -OutFile "$env:TEMP\Firefox$NewFirefoxVersion.msi"
	
	Try {
		$FirefoxProcess = Get-Process -Name "firefox" -ErrorAction SilentlyContinue
		If ($FirefoxProcess) {Stop-Process -Name "firefox" -Force -ErrorAction Stop}
		Write-Host "Installing Firefox Version $NewFirefoxVersion, please wait..."
		$ArgumentList = "/i $env:TEMP\Firefox$NewFirefoxVersion.msi INSTALL_DIRECTORY_PATH=""D:\ProgramFiles\Mozilla Firefox"" /quiet"
	    Start-Process -FilePath "msiexec.exe" -ArgumentList $ArgumentList -Wait
	} Catch {
		Write-Host "ERROR!"
		Write-Host $Error[0].ToString()
	} Finally {
	    Write-Host "Cleaning Up!"
	    Remove-Item "$env:TEMP\Firefox$NewFirefoxVersion.msi" -Force
	} #end try/catch/finally
	
} #end function

$CurrentFirefoxVersion	= Get-CurrentFirefoxVersion
$NewFirefoxVersion		= Get-NewFirefoxVersion

If ($NewFirefoxVersion -gt $CurrentFirefoxVersion) {
	Write-Host "Install or Update is neccessary!"
	Update-NewFirefoxVersion -NewFirefoxVersion $NewFirefoxVersion
	Write-Host "Install or Update is completed!"
} Else {
	Write-Host "No Install or Update is neccessary!"
} #end if/else