Auto-Update Hosts file

$global:hosts = "C:\Windows\system32\drivers\etc\hosts"
$global:url = "https://someonewhocares.org/hosts/hosts"
$global:temp = "C:\temp\hosts"
$global:logFile = "C:\_Scripts\Update_Hosts_File.log"

Enum LogLevel {
    Info = 0
    Warning = 1
    Error = 2
}

function Write-Log ([string]$message, [LogLevel]$logLevel) {
    if ($null -eq $logLevel) {
        $logLevel = [LogLevel]::Info
    }

    if ($logLevel -eq [LogLevel]::Info) {
        Add-Content -Path $logFile -Value "$(Get-Date): $message"
        Write-Host $message
    }
    elseif ($logLevel -eq [LogLevel]::Warning) {
        Add-Content -Path $logFile -Value "$(Get-Date): WARNING: $message"
        Write-Host $message -ForegroundColor Yellow
    }
    elseif ($logLevel -eq [LogLevel]::Error) {
        Add-Content -Path $logFile -Value "$(Get-Date): ERROR: $message"
        Write-Host $message -ForegroundColor Red
    }
}

Write-Log "Script started."
try {
    Write-Log "Downloading hosts file from URL $url..."
    Invoke-WebRequest -Uri $url -OutFile $temp
    $newHash = (Get-FileHash -Path $temp -Algorithm SHA256).Hash
    $oldHash = (Get-FileHash -Path $hosts -Algorithm SHA256).Hash

    if ($newHash -ne $oldHash) {
        Write-Log "Copying new file..."
        Move-Item -Path $temp -Destination $(Split-Path $hosts) -Force
        Write-Log "Done."
    }
    else {
       Write-Log "File is up to date."
    }
}
catch {
    Write-Log "Script failed: $($_.Exception.Message)" Error
    exit 1
}
Write-Log "Script finished."