ergoserv/auxiliary_rails

require 'active_support/concern'
require 'active_support/ordered_options'

module AuxiliaryRails
  module Application
    module Service
      def self.included(klass)
        raise AuxiliaryRails::Error,
          "Use `extend` insted of `include` for #{self} in #{klass}"
      end

      # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
      def config
        return @config if @config.present?

        # load from constant
        if const_defined?(:CONFIG)
          return @config = ActiveSupport::OrderedOptions.new.update(const_get(:CONFIG))
        end

        service_name = name.underscore

        # load from service config file
        if Rails.root.join("config/services/#{service_name}.yml").exist?
          return @config = Rails.application.config_for("services/#{service_name}")
        end

        # load from application config
        if Object.const_defined?(:Config) && Config.respond_to?(:const_name)
          app_config = Object.const_get(Config.const_name)
          if app_config.dig(:services, service_name).present?
            return @config = app_config[:services][service_name]
          end
        end

        raise AuxiliaryRails::Error,
          "Unable to find suitable config for #{name} module"
      end
      # rubocop:enable Metrics/AbcSize, Metrics/MethodLength
    end
  end
end