/**
 * TokenWidget component.
 * @module components/manage/Widgets/TokenWidget
 */

import React, { useEffect, useMemo } from 'react';
import PropTypes from 'prop-types';
import { useSelector, useDispatch } from 'react-redux';
import { defineMessages, useIntl } from 'react-intl';
import {
  getVocabFromHint,
  getVocabFromField,
  getVocabFromItems,
} from '@plone/volto/helpers/Vocabularies/Vocabularies';
import { getVocabulary } from '@plone/volto/actions/vocabularies/vocabularies';

import {
  Option,
  DropdownIndicator,
  ClearIndicator,
  MultiValueContainer,
  selectTheme,
  customSelectStyles,
} from '@plone/volto/components/manage/Widgets/SelectStyling';

import FormFieldWrapper from '@plone/volto/components/manage/Widgets/FormFieldWrapper';
import { injectLazyLibs } from '@plone/volto/helpers/Loadable/Loadable';

const messages = defineMessages({
  select: {
    id: 'Select…',
    defaultMessage: 'Select…',
  },
  no_options: {
    id: 'No options',
    defaultMessage: 'No options',
  },
});

/**
 * TokenWidget component class.
 *
 * Because new terms are created through the web by using the widget, the token
 * widget conflates the meaning of token, label and value and assumes they can
 * be used interchangeably.
 *
 * @class TokenWidget
 * @extends Component
 */
const TokenWidget = (props) => {
  const {
    id,
    onChange,
    value,
    placeholder,
    reactSelectCreateable,
    isDisabled,
    fieldSet,
  } = props;

  const intl = useIntl();
  const dispatch = useDispatch();

  const vocabBaseUrl =
    getVocabFromHint(props) ||
    getVocabFromField(props) ||
    getVocabFromItems(props);

  const lang = useSelector((state) => state.intl.locale);

  const vocabState = useSelector((state) => {
    if (!vocabBaseUrl) return null;
    return state.vocabularies?.[vocabBaseUrl]?.subrequests?.[lang];
  });

  const choices = useMemo(() => {
    if (vocabState?.items) {
      return vocabState.items.map((item) => ({
        label: item.label || item.value,
        value: item.value,
      }));
    }
    return [];
  }, [vocabState]);

  const vocabLoading = vocabState?.loading;
  const vocabLoaded = vocabState?.loaded;

  useEffect(() => {
    if (
      !choices?.length &&
      vocabLoading === undefined &&
      !vocabLoaded &&
      vocabBaseUrl
    ) {
      dispatch(
        getVocabulary({
          vocabNameOrURL: vocabBaseUrl,
          size: -1,
          subrequest: lang,
        }),
      );
    }
  }, [
    choices?.length,
    vocabLoading,
    vocabLoaded,
    vocabBaseUrl,
    lang,
    dispatch,
  ]);

  const handleChange = (selectedOption) => {
    onChange(
      id,
      selectedOption ? selectedOption.map((item) => item.label) : null,
    );
  };

  const selectedOption = value
    ? value.map((item) => ({ label: item, value: item }))
    : [];

  const defaultOptions = (choices || [])
    .filter((item) => !selectedOption.find(({ label }) => label === item.label))
    .map((item) => ({
      label: item.label || item.value,
      value: item.value,
    }));
  const CreatableSelect = reactSelectCreateable.default;

  return (
    <FormFieldWrapper {...props}>
      <CreatableSelect
        id={`field-${id}`}
        aria-labelledby={`fieldset-${fieldSet}-field-label-${id}`}
        key={id}
        menuShouldScrollIntoView={false}
        isDisabled={isDisabled}
        className="react-select-container"
        classNamePrefix="react-select"
        defaultOptions={defaultOptions}
        options={defaultOptions}
        styles={customSelectStyles}
        theme={selectTheme}
        components={{
          MultiValueContainer,
          ClearIndicator,
          DropdownIndicator,
          Option,
        }}
        isMulti
        value={selectedOption || []}
        onChange={handleChange}
        placeholder={placeholder ?? intl.formatMessage(messages.select)}
        noOptionsMessage={() => intl.formatMessage(messages.no_options)}
      />
    </FormFieldWrapper>
  );
};

TokenWidget.propTypes = {
  id: PropTypes.string.isRequired,
  title: PropTypes.string.isRequired,
  description: PropTypes.string,
  required: PropTypes.bool,
  error: PropTypes.arrayOf(PropTypes.string),
  choices: PropTypes.arrayOf(PropTypes.object),
  items: PropTypes.shape({
    vocabulary: PropTypes.object,
  }),
  widgetOptions: PropTypes.shape({
    vocabulary: PropTypes.object,
  }),
  value: PropTypes.arrayOf(PropTypes.string),
  onChange: PropTypes.func.isRequired,
  wrapped: PropTypes.bool,
  placeholder: PropTypes.string,
};

TokenWidget.defaultProps = {
  description: null,
  required: false,
  items: {
    vocabulary: null,
  },
  widgetOptions: {
    vocabulary: null,
  },
  error: [],
  choices: [],
  value: null,
};

export default injectLazyLibs(['reactSelectCreateable'])(TokenWidget);