require 'split/helper'

module Split
  module Analytics
    def tracking_code(options = {})
      # needs more options: http://code.google.com/apis/analytics/docs/gaJS/gaJSApi.html
      account = options.delete(:account)
      tracker_url = options.delete(:tracker_url)
      ssl_tracker_url = options.delete(:ssl_tracker_url)
      tracker_methods = options.delete(:tracker_methods)

      tracker_url = 'http://' + (tracker_url || 'www.google-analytics.com/ga.js')
      ssl_tracker_url = 'https://' + (ssl_tracker_url || 'ssl.google-analytics.com/ga.js')

      code = <<-EOF
        <script type="text/javascript">
          var _gaq = _gaq || [];
          _gaq.push(["_setAccount", "#{account}"]);
          #{insert_tracker_methods(tracker_methods)}
          #{custom_variables}
          _gaq.push(["_trackPageview"]);
          (function() {
            var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
            ga.src = ('https:' == document.location.protocol ? '#{ssl_tracker_url}' : '#{tracker_url}');
            var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
          })();
        </script>
      EOF
      code = raw(code) if defined?(raw)
      code
    end

    def custom_variables
      return nil if ab_user.nil?
      arr = []

      ab_user.active_experiments.each_with_index do |h, i|
        arr << "_gaq.push([\"_setCustomVar\", #{i + 1}, \"#{h[0]}\", \"#{h[1]}\", 1]);"
      end
      arr.reverse[0..4].reverse.join("\n")
    end

    private

      def insert_tracker_methods(tracker_methods)
        return nil if tracker_methods.nil?
        arr = []
        tracker_methods.each do |k, v|
          if v.class == String && v.empty?
            # No argument tracker method
            arr << "_gaq.push([\"" + "_" + "#{k}\"]);"
          else
            case v
            when String
              # String argument tracker method
              arr << "_gaq.push([\"" + '_' + "#{k}\", \"#{v}\"]);"
            when TrueClass
              # Boolean argument tracker method
              arr << "_gaq.push([\"" + '_' + "#{k}\", #{v}]);"
            when FalseClass
              # Boolean argument tracker method
              arr << "_gaq.push([\"" + '_' + "#{k}\", #{v}]);"
            when Array
              # Array argument tracker method
              values = v.map { |value| "\"#{value}\"" }.join(', ')
              arr << "_gaq.push([\"" + '_' + "#{k}\", #{values}]);"
            end
          end
        end
        arr.join("\n")
      end
  end
end

module Split::Helper
  include Split::Analytics
end

if defined?(Rails)
  class ActionController::Base
    ActionController::Base.send :include, Split::Analytics
    ActionController::Base.helper Split::Analytics
  end
end