module Adminpanel
    class AnalyticsController < Adminpanel::ApplicationController
    authorize_resource :class => false
		skip_before_filter :set_model

		API_VERSION = 'v3'
		CACHED_API_FILE = "#{Rails.root}/tmp/cache/analytics-#{API_VERSION}.cache"

		def index
			unless Adminpanel.analytics_profile_id.nil? || Adminpanel.analytics_key_filename.nil?
				service_account_email = '266789642405-0nppij5ll43bbvhpsn986puulssdoc45@developer.gserviceaccount.com' # Email of service account
				key_file = "#{Rails.root}/#{Adminpanel.analytics_key_path}/#{Adminpanel.analytics_key_filename}" # File containing your private key
				key_secret = 'notasecret' # Password to unlock private key
				profileID = Adminpanel.analytics_profile_id # Analytics profile ID.


				client = Google::APIClient.new(
				  :application_name => 'AdminPanel',
				  :application_version => '1.0.0'
        )

				analytics = nil
				# Load cached discovered API, if it exists. This prevents retrieving the
				# discovery document on every run, saving a round-trip to the discovery service.
				if File.exists? CACHED_API_FILE
				  File.open(CACHED_API_FILE) do |file|
				    analytics = Marshal.load(file)
				  end
				else
				  analytics = client.discovered_api('analytics', API_VERSION)
				  File.open(CACHED_API_FILE, 'w') do |file|
				    Marshal.dump(analytics, file)
				  end
				end

				key = Google::APIClient::KeyUtils.load_from_pkcs12(key_file, key_secret)
				client.authorization = Signet::OAuth2::Client.new(
					:token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
				  :audience => 'https://accounts.google.com/o/oauth2/token',
          :authorization_uri => 'https://accounts.google.com/o/oauth2/auth',
				  :scope => 'https://www.googleapis.com/auth/analytics.readonly',
				  :issuer => service_account_email,
				  :signing_key => key
				)
				# Request a token for our service account
				client.authorization.fetch_access_token!

				startDate = DateTime.now.prev_month.strftime("%Y-%m-%d")
				endDate = DateTime.now.strftime("%Y-%m-%d")

				@visitCount = client.execute(
          :api_method => analytics.data.ga.get,
          :parameters => {
  				  'ids' => "ga:#{profileID}",
  				  'start-date' => startDate,
  				  'end-date' => endDate,
  				  'dimensions' => "ga:day,ga:month",
  				  'metrics' => "ga:visits",
  				  'sort' => "ga:month,ga:day"
				  }
        )

				@visits = @visitCount.data.rows.collect do |r|
				  	r[2]
				end

				@visitDates = @visitCount.data.rows.collect { |r| "#{r[0]}/#{r[1]}" }

			end
      respond_to do |format|
        format.html
        format.json {render :json => {:visit_count => @visitCount, :visits => @visits, :visit_dates => @visitDates }}
      end
		end
	end
end