hello-gem/hello

require 'user_agent_parser'

module Hello
  module Utils
    class DeviceName
      # https://github.com/toolmantim/user_agent_parser
      # Instantiate the parser on load as it's quite expensive
      include Singleton

      def parse(user_agent_string)
        obj = user_agent_parser.parse(user_agent_string)
        a_browser = obj.to_s
        a_os = obj.os.to_s
        a_browser = "#{obj.name} #{obj.version && obj.version.major}".strip
        a_os = "#{obj.os.name} #{obj.os.version && obj.os.version.major}".strip
        a_device = obj.device.name

        a_browser = a_browser.gsub('IE', 'Internet Explorer') if a_browser.start_with? 'IE'

        if a_device == 'Other'
          "#{a_os} - #{a_browser}"
        elsif a_device == 'Spider'
          "Spider: #{a_browser}"
        else
          "#{a_os} (#{a_device}) - #{a_browser}"
        end.strip
      end

      def user_agent_parser
        @uap = UserAgentParser::Parser.new
      end
    end
  end
end