require Rails.root.join('lib', 'statistics' )

namespace :stats do
  desc 'Emails recent engagement statistics the admins'
  task :save_retention => :environment do
    require Rails.root.join('app', 'mailers', 'notifier' )

    return unless AppConfig[:admins].present? 

    admins =  User.find_all_by_username( AppConfig[:admins])

    require 'fastercsv'

    string = FasterCSV.generate do |csv|
      (0..32).each do |i|
        csv << [i.to_s, Statistics.new.retention(i)]
      end
    end

    File.open(Rails.root.join("tmp", "retention_stats_#{Time.now.strftime("%Y-%m-%d-%H:%M:%S-%Z")}.txt"), "w") do |file|
      file << string
    end
  end

  task :top_actives => :environment do

    require 'fastercsv'

    string = FasterCSV.generate do |csv|
      (0..32).each do |i|
        actives = ActiveRecord::Base.connection.select_all(Statistics.new.top_active_users(i).to_sql)
        actives.each do |a|
          csv << [i.to_s, a['email'], a['username'], a['first_name'], a['sign_in_count']]
        end
      end
    end

    File.open(Rails.root.join('tmp', 'top_actives.csv'), 'w') {|f| f.write(string) }
  end
end