# Ensure the log directory exists
$logDirectory = "C:\Logs"
if (-not (Test-Path -Path $logDirectory)) {
    try {
        New-Item -ItemType Directory -Path $logDirectory -Force | Out-Null
        Write-Host "INFO: Created log directory at $logDirectory"
    } catch {
        Write-Host "ERROR: Failed to create log directory at $logDirectory - $_"
        exit 1
    }
}

# Define the log file path with a timestamp
$logFile = Join-Path -Path $logDirectory -ChildPath "GeneralSetup_$(Get-Date -Format 'ddMMyyyy_HHmm').log"

# Function to write logs with different levels
function Write-Log {
    param (
        [Parameter(Mandatory=$true)]
        [string]$Message,
        
        [Parameter(Mandatory=$false)]
        [ValidateSet("INFO", "WARNING", "ERROR")]
        [string]$Level = "INFO"
    )

    # Prefix the message based on the level
    switch ($Level) {
        "ERROR"   { $logMessage = "ERROR: $Message" }
        "WARNING" { $logMessage = "WARNING: $Message" }
        default   { $logMessage = "INFO: $Message" }
    }

    # Add timestamp
    $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    $logEntry = "[$timestamp] $logMessage"

    # Write to log file
    Add-Content -Path $logFile -Value $logEntry

    # Also output to console for visibility
    Write-Output $logEntry
}

try {
    Write-Log -Message "Starting script to configure timezone, locale, and region settings." -Level "INFO"

    # Set the time zone to Australia/Perth
    try {
        Set-TimeZone -Id "W. Australia Standard Time" -ErrorAction Stop
        Write-Log -Message "Successfully set timezone to 'W. Australia Standard Time'." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to set timezone: $_" -Level "ERROR"
    }

    # Set the system locale to English (Australia)
    try {
        Set-WinSystemLocale -SystemLocale en-AU -ErrorAction Stop
        Write-Log -Message "Successfully set system locale to 'en-AU'." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to set system locale: $_" -Level "ERROR"
    }

    # Set the user locale to English (Australia)
    try {
        Set-WinUserLanguageList -LanguageList en-AU -Force -ErrorAction Stop
        Write-Log -Message "Successfully set user language list to 'en-AU'." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to set user language list: $_" -Level "ERROR"
    }

    # Set the culture to English (Australia)
    try {
        Set-Culture -CultureInfo en-AU -ErrorAction Stop
        Write-Log -Message "Successfully set culture to 'en-AU'." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to set culture: $_" -Level "ERROR"
    }

    # Set the region settings to Australia (GeoId 12)
    try {
        Set-WinHomeLocation -GeoId 12 -ErrorAction Stop
        Write-Log -Message "Successfully set region settings to Australia (GeoId: 12)." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to set region settings: $_" -Level "ERROR"
    }

    # Synchronize the system clock with an NTP server (optional)
    try {
        w32tm /resync | Out-Null
        Write-Log -Message "Successfully synchronized system clock with NTP server." -Level "INFO"
    } catch {
        Write-Log -Message "Failed to synchronize system clock: $_" -Level "WARNING"
    }

    Write-Log -Message "Date, time, locale, and region settings have been set to Australia/Perth." -Level "INFO"
} catch {
    Write-Log -Message "An unexpected error occurred in the script: $_" -Level "ERROR"
} finally {
    Write-Log -Message "Script execution completed." -Level "INFO"
}