/*
 * 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 React from 'react';
import Box from '@mui/material/Box';
import Button from '@mui/material/Button';
import AddIcon from '@mui/icons-material/Add';
import type { QuestionnaireResponseItemAnswer } from 'fhir/r4';

interface AddItemButtonProps {
  repeatAnswers: (QuestionnaireResponseItemAnswer | null)[];
  readOnly: boolean;
  onAddItem: () => void;
}

function AddItemButton(props: AddItemButtonProps) {
  const { repeatAnswers, readOnly, onAddItem } = props;

  // Check if the last answer is null or does not have a value[x]
  // Also disables button if item is readOnly
  const lastAnswer = repeatAnswers[repeatAnswers.length - 1];
  const isDisabled =
    lastAnswer === null || Object.keys(lastAnswer ?? {}).join() === 'id' || readOnly;

  return (
    <Box display="flex" flexDirection="row-reverse" sx={{ mt: 1 }}>
      <Button
        variant="contained"
        size="small"
        startIcon={<AddIcon />}
        disabled={isDisabled}
        onClick={onAddItem}
        data-test="button-add-repeat-item">
        Add Item
      </Button>
    </Box>
  );
}

export default AddItemButton;