You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: confirmation_email.rb
    path of file: ./repos/vets-api/modules/simple_forms_api/app/services/simple_forms_api
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module SimpleFormsApi
  class ConfirmationEmail
    attr_reader :form_number, :confirmation_number, :user

    TEMPLATE_IDS = {
      'vba_21_0845' => Settings.vanotify.services.va_gov.template_id.form21_0845_confirmation_email,
      'vba_21p_0847' => Settings.vanotify.services.va_gov.te
    
    def form_specific_data
      email, first_name = case @form_number
                          when 'vba_21_0845'
                            return unless Flipper.enabled?(:form21_0845_confirmation_email)

                            form21_0845_contact_info(@form_data)
                          when 'vba_21p_0847'
                            return unless Flipper.enabled?(:form21p_0847_confirmation_email)

                            [@form_data['preparer_email'], @form_data.dig('preparer_name', 'first')]
                          when 'vba_21_0972'
                            return unless Flipper.enabled?(:form21_0972_confirmation_email)

                            [@form_data['preparer_email'], @form_data.dig('preparer_full_name', 'first')]
                          when 'vba_21_4142'
                            return unless Flipper.enabled?(:form21_4142_confirmation_email)

                            [@form_data.dig('veteran', 'email'), @form_data.dig('veteran', 'full_name', 'first')]
                          when 'vba_21_10210'
                            return unless Flipper.enabled?(:form21_10210_confirmation_email)

                            form21_10210_contact_info(@form_data)
                          when 'vba_20_10206'
                            return unless Flipper.enabled?(:form20_10206_confirmation_email)

                            form20_10206_contact_info(@form_data)
                          when 'vba_40_0247'
                            return unless Flipper.enabled?(:form40_0247_confirmation_email)

                            [@form_data['applicant_email'], @form_data.dig('applicant_full_name', 'first')]
                          else
                            [nil, nil]
                          end