baclight/app/models/id_card/field_exception_item.rb

module IdCard
    class FieldExceptionItem < ApplicationRecord
        belongs_to :field_exception
        belongs_to :network_logo, optional: true
        belongs_to :provider_section, optional: true

        validate :only_one_exception_field_present

        FIELDS_TO_VALIDATE = [:field_value, :network_logo_id, :provider_section_id].freeze

        VALID_FIELD_NAMES = ['network_logo', 'provider_section', 'medical_eff_date']

        validates :field_name, inclusion: { in: VALID_FIELD_NAMES,
                                        message: "%{value} is not a valid Id Card Field Name" }


        def card_attrs
            case self.field_name
            when "network_logo"
                    {"network_logo_filename" => IdCard::NetworkLogo.find(self.network_logo_id).filename}
            when "provider_section"
                    IdCard::ProviderSection.find(self.provider_section_id).attributes.with_indifferent_access.slice(
                    :provider_line_1, :provider_line_2, :provider_line_3, :provider_line_4, :provider_line_5, :provider_line_6,
                    :provider_line_7, :provider_line_8, :provider_line_9, :provider_line_10, :provider_line_11, :provider_line_12,
                    :claim_to_1, :claim_to_2, :claim_to_3, :claim_to_4, :claim_to_5, :claim_to_6,
                    :claim_to_7, :claim_to_8, :claim_to_9, :claim_to_10, :claim_to_11, :claim_to_12
                )
            when "medical_eff_date"
                    {"medical_eff_date" => self.field_value}
            end
        end
    
        private

        def only_one_exception_field_present
            present_fields = FIELDS_TO_VALIDATE.count { |field| self[field].present? }

            if present_fields != 1
                errors.add(:base, "Only one exception field can be present at a time")
            end
        end
    end
end