/**
 * Copyright (c) 2016-present, NDLA.
 *
 * This source code is licensed under the GPLv3 license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

import React from 'react';
import PropTypes from 'prop-types';
import BEMHelper from 'react-bem-helper';
import { Additional, Core } from 'ndla-icons/common';
import { Tooltip, NoContentBox, SafeLink } from 'ndla-ui';
import { Trans } from 'ndla-i18n';
import { TopicShape, ShortcutShape } from '../shapes';
import TopicIntroductionShortcuts from './TopicIntroductionShortcuts';

const topicClasses = new BEMHelper({
  prefix: 'c-',
  name: 'topic-introduction',
  outputIsString: true,
});

const TopicIntroduction = ({
  toTopic,
  topic,
  subjectPage,
  shortcuts,
  messages,
  shortcutAlwaysExpanded,
  additional,
  showAdditionalCores,
  id,
}) => {
  const contentTypeDescription = additional
    ? messages.tooltipAdditionalTopic
    : messages.tooltipCoreTopic;

  return (
    <li
      className={topicClasses('item', {
        subjectPage,
        additional,
        showAdditionalCores,
      })}>
      <article className={topicClasses('body')}>
        <div className={topicClasses('heading-wrapper')}>
          <h1 className={topicClasses('header')}>
            <SafeLink to={toTopic(topic.id)} aria-describedby={id}>
              {topic.name}
            </SafeLink>
          </h1>
          <span id={id} hidden>
            {contentTypeDescription}
          </span>
          {additional && (
            <Tooltip tooltip={messages.tooltipAdditionalTopic} align="left">
              <Additional className="c-icon--20 u-margin-left-tiny" />
            </Tooltip>
          )}
          {!additional &&
            showAdditionalCores && (
              <Tooltip tooltip={messages.tooltipCoreTopic} align="left">
                <Core className="c-icon--20 u-margin-left-tiny" />
              </Tooltip>
            )}
        </div>
        {/* Since topic introduction is already escaped from the api
          we run into a double escaping issues as React escapes all strings.
          Use dangerouslySetInnerHTML to circumvent the issue */}
        <p dangerouslySetInnerHTML={{ __html: topic.introduction }} />
        {shortcuts && (
          <TopicIntroductionShortcuts
            alwaysExpanded={shortcutAlwaysExpanded}
            id={`${topic.id}_shortcuts`}
            shortcuts={shortcuts}
            messages={{
              toggleButtonText: messages.shortcutButtonText,
            }}
          />
        )}
      </article>
    </li>
  );
};

TopicIntroduction.propTypes = {
  additional: PropTypes.bool,
  showAdditionalCores: PropTypes.bool,
  messages: PropTypes.shape({
    shortcutButtonText: PropTypes.string.isRequired,
    tooltipAdditionalTopic: PropTypes.string,
    tooltipCoreTopic: PropTypes.string,
  }),
  topic: TopicShape.isRequired,
  toTopic: PropTypes.func.isRequired,
  subjectPage: PropTypes.bool,
  shortcuts: PropTypes.arrayOf(ShortcutShape),
  twoColumns: PropTypes.bool,
  shortcutAlwaysExpanded: PropTypes.bool,
  id: PropTypes.string.isRequired,
};

TopicIntroduction.defaultProps = {
  showAdditionalCores: false,
  additional: false,
};

const TopicIntroductionList = ({
  topics,
  twoColumns,
  shortcutAlwaysExpanded,
  showAdditionalCores,
  toggleAdditionalCores,
  ...rest
}) => {
  const renderAdditionalTopicsTrigger =
    !showAdditionalCores &&
    topics.filter(topic => topic.additional).length > 0 &&
    topics.filter(topic => !topic.additional).length === 0;

  return (
    <Trans>
      {({ t }) => (
        <ul className={topicClasses('list', { twoColumns })}>
          {topics.map((topic, index) => {
            const { shortcuts, additional } = topic;
            return (
              <TopicIntroduction
                key={topic.id}
                {...rest}
                topic={topic}
                shortcuts={shortcuts}
                additional={additional}
                showAdditionalCores={showAdditionalCores}
                shortcutAlwaysExpanded={shortcutAlwaysExpanded}
                messages={{
                  shortcutButtonText: t('resource.label'),
                  tooltipAdditionalTopic: t('resource.tooltipAdditionalTopic'),
                  tooltipCoreTopic: t('resource.tooltipCoreTopic'),
                }}
                id={`${topic.id}_${index}`}
              />
            );
          })}
          {renderAdditionalTopicsTrigger && (
            <li>
              <NoContentBox
                onClick={toggleAdditionalCores}
                text={t('resource.noCoreResourcesAvailableUnspecific')}
                buttonText={t('resource.activateAdditionalResources')}
              />
            </li>
          )}
        </ul>
      )}
    </Trans>
  );
};

TopicIntroductionList.propTypes = {
  toTopic: PropTypes.func.isRequired,
  topics: PropTypes.arrayOf(TopicShape).isRequired,
  twoColumns: PropTypes.bool,
  shortcutAlwaysExpanded: PropTypes.bool,
  showAdditionalCores: PropTypes.bool,
  toggleAdditionalCores: PropTypes.func.isRequired,
};

TopicIntroductionList.defaultProps = {
  twoColumns: false,
  shortcutAlwaysExpanded: false,
  showAdditionalCores: false,
};

export default TopicIntroductionList;