wrong_open_closed_principle.rb

class ReportSender
  def initialize(report, account)
    @report = report
    @account = account
  end

  def send_report(way_of_sending = :email)
    case way_of_sending
      when :email
        Mailer.deliver(
          from: 'foo@bar.com',
          to: @account.email,
          subject: 'Report',
          body: @report
        )
      when :sms
        client = Twilio::REST::Client.new('ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX', @account.auth_token)
        client.account.messages.create(
          from: '+66613371337',
          to: @account.phone,
          body: @report
        )
    else
      raise raise NotImplementedError
    end
  end
end

class ReportGenerator
  # report generation
end

report = ReportGenerator.new(data).generate
ReportSender.new(report, account).send_report(:sms)