EcrituresNumeriques / stylo / 14055709846

import React, { useCallback } from 'react'

import { ArrowLeft } from 'react-feather'

import { useTranslation } from 'react-i18next'

import { useDispatch, useSelector } from 'react-redux'

import { useRouteMatch } from 'react-router-dom'

import { usePandocAnchoring } from '../../hooks/pandoc.js'

import styles from './ArticleTableOfContents.module.scss'

export default function ArticleTableOfContents({ onBack }) {

  const { t } = useTranslation()

  const dispatch = useDispatch()

  const articleStructure = useSelector((state) => state.articleStructure)

  const getAnchor = usePandocAnchoring()

  const routeMatch = useRouteMatch()

  const hasHtmlAnchors = routeMatch.path === '/article/:id/preview'

  const handleTableOfContentsEntryClicked = useCallback(

    ({ target }) => {

      hasHtmlAnchors

        ? document

            .querySelector(`#${target.dataset.headingAnchor}`)

            ?.scrollIntoView()

        : dispatch({

            type: 'UPDATE_EDITOR_CURSOR_POSITION',

            lineNumber: parseInt(target.dataset.index, 10),

            column: 0,

          })

    },

    [hasHtmlAnchors]

  )

  if (articleStructure.length === 0) {

    return <></>

  }

  const title = onBack ? (

    <h2

      className={styles.title}

      onClick={onBack}

      style={{ cursor: 'pointer', userSelect: 'none' }}

      <span onClick={onBack} style={{ display: 'flex' }}>

        <ArrowLeft style={{ strokeWidth: 3 }} />

      </span>

      <span>{t('toc.title')}</span>

    </h2>

    <h2 className={styles.title}>{t('toc.title')}</h2>

  return (

    <>

      <header>{title}</header>

      <ul>

        {articleStructure.map((item) => (

          <li

            className={styles.headlineItem}

            key={`line-${item.index}-${item.line}`}

            role="button"

            tabIndex={0}

            data-index={item.index}

            data-heading-anchor={getAnchor(item.line)}

            onClick={handleTableOfContentsEntryClicked}

            {item.title}

          </li>

        ))}

      </ul>

    </>

}