require 'rest_client'

# more info on Measurement Protocol https://developers.google.com/analytics/devguides/collection/protocol/v1/
class GoogleAnalyticsTracker

  attr_accessor :enabled, :tracking_code, :ga_version, :ga_endpoint

  def initialize(enabled, tracking_code=nil, ga_version=nil, ga_endpoint="http://www.google-analytics.com/collect")
    if enabled && tracking_code.nil?
      raise "misconfigured application; a tracking code must be specified if tracking is enabled"
    end

    if enabled && ga_version.nil?
      raise "misconfigured application; a google analytics version must be specified if tracking is enabled"
    end

    @tracking_code = tracking_code
    @ga_version = ga_version
    @ga_endpoint = "http://www.google-analytics.com/collect"
  end

  def event(category, action, client_id = nil)
    return unless enabled

    params = {
        v: @ga_version,
        tid: @tracking_code,
        cid: client_id
    t: "event",
        ec: category,
        ea: action
    }

    begin
      RestClient.get(@"http://www.google-analytics.com/collect", params: params, timeout: 4, open_timeout: 4)
      return true
    rescue  RestClient::Exception => rex
      return false
    end
  end

end