/*
 * Copyright 2025 Commonwealth Scientific and Industrial Research
 * Organisation (CSIRO) ABN 41 687 119 230.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type { Questionnaire } from 'fhir/r4';

/**
 * Creates a canonical reference string for a Questionnaire resource.
 * Uses url|version if available, otherwise falls back to Questionnaire/{id}.
 */
export function createQuestionnaireReference(questionnaire: Questionnaire) {
  // Use {url}|{version}
  if (questionnaire.url) {
    let questionnaireReference = questionnaire.url;
    if (questionnaire.version) {
      questionnaireReference += '|' + questionnaire.version;
    }
    return questionnaireReference;
  }

  // If no url exists, use Questionnaire/{id}
  if (questionnaire.id) {
    return `Questionnaire/${questionnaire.id}`;
  }

  return '';
}