First pass at bringing code across

Gemfile

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+source 'https://rubygems.org'
+
+gem 'actionmailer', '3.2.12'
+gem 'oauth'
+gem 'garb'
+gem 'terminal-table'
+gem 'aws-ses', '0.4.4', :require => 'aws/ses'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    actionmailer (3.2.12)
+      actionpack (= 3.2.12)
+      mail (~> 2.4.4)
+    actionpack (3.2.12)
+      activemodel (= 3.2.12)
+      activesupport (= 3.2.12)
+      builder (~> 3.0.0)
+      erubis (~> 2.7.0)
+      journey (~> 1.0.4)
+      rack (~> 1.4.5)
+      rack-cache (~> 1.2)
+      rack-test (~> 0.6.1)
+      sprockets (~> 2.2.1)
+    activemodel (3.2.12)
+      activesupport (= 3.2.12)
+      builder (~> 3.0.0)
+    activesupport (3.2.12)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    aws-ses (0.4.4)
+      builder
+      mail (> 2.2.5)
+      mime-types
+      xml-simple
+    builder (3.0.4)
+    crack (0.3.2)
+    erubis (2.7.0)
+    garb (0.9.1)
+      activesupport (>= 2.2.0)
+      crack (>= 0.1.6)
+    hike (1.2.1)
+    i18n (0.6.4)
+    journey (1.0.4)
+    mail (2.4.4)
+      i18n (>= 0.4.0)
+      mime-types (~> 1.16)
+      treetop (~> 1.4.8)
+    mime-types (1.21)
+    multi_json (1.6.1)
+    oauth (0.4.7)
+    polyglot (0.3.3)
+    rack (1.4.5)
+    rack-cache (1.2)
+      rack (>= 0.4)
+    rack-test (0.6.2)
+      rack (>= 1.0)
+    sprockets (2.2.2)
+      hike (~> 1.2)
+      multi_json (~> 1.0)
+      rack (~> 1.0)
+      tilt (~> 1.1, != 1.3.0)
+    terminal-table (1.4.5)
+    tilt (1.3.4)
+    treetop (1.4.12)
+      polyglot
+      polyglot (>= 0.3.1)
+    xml-simple (1.1.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  actionmailer (= 3.2.12)
+  aws-ses (= 0.4.4)
+  garb
+  oauth
+  terminal-table

lib/analytics_interface.rb

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+require 'oauth'
+require 'garb'
+require 'active_support/core_ext'
+
+class MainVisits
+  extend Garb::Model
+
+  metrics :pageviews, :unique_pageviews, :avg_time_on_page
+  dimensions :page_path, :page_title
+end
+
+class Overview
+  extend Garb::Model
+
+  metrics :visitors, :new_visits
+end
+
+module AnalyticsUtils
+  def percentage_change(from, to)
+    change = 100 * (to.to_f - from.to_f) / from.to_f
+    change = change.round(2)
+    if change > 0
+      "+#{change}"
+    else
+      change.to_s
+    end
+  end
+end
+
+class AnalyticsInterface
+
+  attr_accessor :profile, :property, :oauth_token, :oauth_secret
+
+  def initialize(analytics_id, oauth_token, oauth_secret)
+    establish_garb_session
+    self.property = Garb::Management::WebProperty.all.detect { |p| p.id == analytics_id }
+    self.profile = Garb::Management::Profile.all.detect { |p| p.web_property_id == analytics_id }
+    self.oauth_token = oauth_token
+    self.oauth_secret = oauth_secret
+  end
+
+  def weekly_stats
+    yesterday = Date.yesterday
+    start_of_the_week = yesterday - 7.days
+    start_of_previous_week = start_of_the_week - 7.days
+
+    first_period = overview(start_of_the_week, yesterday)
+    second_period = overview(start_of_previous_week, start_of_the_week)
+    describe_period(first_period, second_period, "this week", "last week")
+  end
+
+  def daily_stats
+    yesterday = Date.yesterday
+    day_before_yesterday = Date.yesterday - 1.day
+
+    first_period = overview(yesterday, yesterday)
+    second_period = overview(day_before_yesterday, day_before_yesterday)
+    describe_period(first_period, second_period, "yesterday", "the day before")
+  end
+
+  def main_visits_data
+    profile.main_visits(
+      :start_date => Date.yesterday,
+      :end_date => Date.yesterday,
+      :limit => 10,
+      :sort => :unique_pageviews.desc
+    )
+  end
+
+private
+  include AnalyticsUtils
+
+  def overview(start_date, end_date)
+    profile.overview(
+      :filters => { :page_path.does_not_contain => 'admin' }, 
+      :start_date => start_date,
+      :end_date => end_date
+    ).first
+  end
+
+  def describe_period(current_period, previous_period, this_kind, last_kind)
+    {
+      visitors: current_period.visitors,
+      visitors_change: percentage_change(previous_period.visitors, current_period.visitors),
+      new_visits: current_period.new_visits,
+      new_visits_change: percentage_change(previous_period.new_visits, current_period.new_visits)
+    }
+  end
+
+  def build_oauth_token
+    consumer = OAuth::Consumer.new('anonymous', 'anonymous', {
+      :site => 'https://www.google.com',
+      :request_token_path => '/accounts/OAuthGetRequestToken',
+      :access_token_path => '/accounts/OAuthGetAccessToken',
+      :authorize_path => '/accounts/OAuthAuthorizeToken'
+    })
+
+    OAuth::AccessToken.new(consumer, oauth_token, oauth_secret)
+  end
+
+  def establish_garb_session
+    Garb::Session.access_token = build_oauth_token
+  end
+end

lib/report_mailer.rb

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+require 'terminal-table'
+
+class ReportMailer < ActionMailer::Base
+  default from: "winston@alphagov.co.uk"
+
+  def daily_analytics(recipient_address, daily, weekly, top_ten_pages)
+    @daily = daily
+    @weekly = weekly
+    @top_ten_pages = top_ten_pages
+
+    mail(to: recipient_address, subject: analytics_subject(daily, weekly)) do |format|
+      format.text
+    end
+  end
+
+  protected
+  def top_ten_table(top_ten_pages)
+    Terminal::Table.new do |t|
+      t.add_row ['Title', 'Page Views', 'Unique Page Views', 'Avg Time on Page']
+      t.add_separator
+      top_ten_pages.each do |detail|
+        t.add_row [
+          detail.page_title, detail.pageviews, detail.unique_pageviews,
+          detail.avg_time_on_page.to_i
+        ]
+      end
+    end
+  end
+
+  def analytics_subject(daily, weekly)
+    [
+      "NEEDOTRON DAILY: Yesterday: #{daily[:visitors]} (#{daily[:visitors_change]}%) #{daily[:new_visits]} (#{daily[:new_visits_change]}%)",
+      "7 days: #{weekly[:visitors]} (#{weekly[:visitors_change]}%) #{weekly[:new_visits]} (#{weekly[:new_visits_change]}%)"
+    ].join(' | ')
+  end
+end

send_email.rb

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+#!/usr/bin/env ruby
+
+require 'action_mailer'
+require 'aws/ses'
+
+require_relative 'lib/analytics_interface'
+require_relative 'lib/report_mailer'
+
+view_path = File.expand_path('views', File.dirname(__FILE__))
+
+ActionMailer::Base.add_delivery_method :ses, AWS::SES::Base,
+  :access_key_id     => ENV['SES_ACCESS_KEY_ID'],
+  :secret_access_key => ENV['SES_SECRET_KEY']
+ActionMailer::Base.delivery_method = :ses
+ActionMailer::Base.view_paths = view_path
+
+interface = AnalyticsInterface.new(ENV['ANALYTICS_ACCOUNT_ID'], ENV['GOOGLE_OAUTH_TOKEN'], ENV['GOOGLE_OAUTH_SECRET'])
+daily = interface.daily_stats
+weekly = interface.weekly_stats
+details = interface.main_visits_data
+ReportMailer.daily_analytics(ENV['RECIPIENT_ADDRESS'], daily, weekly, details).deliver

views/report_mailer/daily_analytics.text.erb

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+UNIQUE VISITS YESTERDAY: <%= @daily[:visitors] %> (<%= @daily[:visitors_change] %>%)
+NEW VISITS YESTERDAY: <%= @daily[:new_visits] %> (<%= @daily[:new_visits_change] %>%)
+
+UNIQUE VISITS LAST 7 DAYS: <%= @weekly[:visitors] %> (<%= @weekly[:visitors_change] %>%)
+NEW VISITS LAST 7 DAYS: <%= @weekly[:new_visits] %> (<%= @weekly[:new_visits_change] %>%)
+
+TOP PAGES YESTERDAY
+
+  Title (page views / unique page views / average time)
+
+<% @top_ten_pages.each do |page| %>
+  <%= page.page_title %> (<%= page.pageviews %> / <%= page.unique_pageviews %> / <%= page.avg_time_on_page.to_i %>)
+  <%= "https://www.gov.uk#{page.page_path}" %>
+
+<% end %>