module HealthDataStandards
  module Util
    # General helpers for working with codes and code systems
    class HQMFTemplateHelper

      def self.definition_for_template_id(template_id, version="r1")
        template_id_map(version)[template_id]
      end

      def self.template_id_map(version)
        if @id_map.blank?
          @id_map = {
            'r1' => JSON.parse(File.read(File.expand_path('../hqmf_template_oid_map.json', __FILE__))),
            'r2' => JSON.parse(File.read(File.expand_path('../hqmfr2_template_oid_map.json', __FILE__))),
            'r2cql' => JSON.parse(File.read(File.expand_path('../hqmfr2cql_template_oid_map.json', __FILE__)))
          }
        end
        @id_map[version]
      end

      def self.template_id_by_definition_and_status(definition, status, negation=false, version="r1")
        case version
        when "r1"
          kv_pair = template_id_map(version).find {|k, v| v['definition'] == definition &&
                                                 v['status'] == status &&
                                                 v['negation'] == negation}
        when "r2", "r2cql"
          kv_pair = template_id_map(version).find {|k, v| v['definition'] == definition &&
                                                 v['status'] == status}
        end
        if kv_pair
          kv_pair.first
        else
          nil
        end
      end
    end
  end
end