internetee-registry/app/models/concerns/email_checkable.rb

module Concerns
  module EmailCheckable
    extend ActiveSupport::Concern

    def email_verification
      EmailAddressVerification.find_or_create_by(email: email,
                                                 domain: domain(email))
    end

    def billing_email_verification
      return unless attribute_names.include?('billing_email')

      EmailAddressVerification.find_or_create_by(email: billing_email,
                                                 domain: domain(email))
    end

    def domain(email)
      Mail::Address.new(email).domain || 'not_found'
    rescue Mail::Field::IncompleteParseError
      'not_found'
    end

    def verify_email_mx_smtp(field:, email:)
      errors.add(field, :invalid) unless email.blank? || Truemail.valid?(email)
    end

    def correct_email_format
      verify_email_mx_smtp(field: :email, email: email)
    end

    def correct_billing_email_format
      verify_email_mx_smtp(field: :billing_email, email: billing_email)
    end
  end
end