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

namespace :stats do
  desc 'Emails recent engagement statistics the admins'
  task :email_retention => :environment do
    require File.join(Rails.root, '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

    emails = Notifier.admin( "here are some retention stats", admins, {:subject => "retention numbers #{Time.now.to_s}", :attachments => [:name => "retention_numbers_#{Time.now.to_s}.csv", :file => string]})
    emails.each {|e| e.deliver!} 
  end
end