module ApplicationHelper
  def nav_link_class(target_controller)
    base_classes = "flex items-center gap-3 px-3 py-2.5 text-sm font-medium rounded-lg transition-colors duration-200"

    if controller_name == target_controller
      "#{base_classes} bg-blue-50 text-blue-600 font-semibold"
    else
      "#{base_classes} text-gray-700 hover:bg-gray-50"
    end
  end

  def parse_user_agent(user_agent_string)
    ua = user_agent_string.to_s.downcase

    # Browser-Erkennung via Case-Regex (nutzt === im Hintergrund)
    browser = case ua
    when /firefox/ then "Firefox"
    when /chrome/  then "Chrome"
    when /safari/  then "Safari"
    when /edge/    then "Edge"
    else "Unbekannter Browser"
    end

    # Betriebssystem-Erkennung via Case-Regex
    os = case ua
    when /windows/   then "Windows"
    when /macintosh|mac os/ then "macOS"
    when /iphone/    then "iPhone"
    when /android/   then "Android"
    when /linux/     then "Linux"
    else "Betriebssystem"
    end

    "#{browser} auf #{os}"
  end
end