/*
 * 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 { QuestionnaireResponseItem, QuestionnaireResponseItemAnswer } from 'fhir/r4';
import { useMemo } from 'react';
import { generateExistingRepeatId, generateNewRepeatId } from '../utils/repeatId';

function useInitialiseRepeatAnswers(
  linkId: string,
  qrItem: QuestionnaireResponseItem | null
): (QuestionnaireResponseItemAnswer | null)[] {
  return useMemo(() => {
    if (!qrItem?.answer) {
      return [{ id: generateNewRepeatId(linkId) }];
    }

    return qrItem.answer.map((answer, index) => ({
      ...answer,
      id: answer.id ?? generateExistingRepeatId(linkId, index)
    }));
  }, [linkId, qrItem]);
}

export default useInitialiseRepeatAnswers;