import { useState, useEffect, useRef, useCallback } from 'react'
import Cookies from 'universal-cookie'
import Link from 'next/link'
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
import { faCheck, faTrash } from '@fortawesome/free-solid-svg-icons'
import redirect from '../../utils/redirect'
import HeadTag from '../../components/HeadTag'
import api from '../../utils/api'
import '../../public/css/pages/admin.css'

const manageQuotes = (props) => {
  const [quotesData, setQuotesData] = useState({ hasMore: true, rows: [], totalItems: 0 })
  const [isLoadingQuotes, setLoadingQuotes] = useState(true)
  const [pageQuotes, setPageQuotes] = useState(1)

  // Récupère les citations si la page change
  useEffect(() => {
    getQuotesData()
  }, [pageQuotes])

  const getQuotesData = async () => {
    setLoadingQuotes(true)
    const { data } = await api.get(`/admin/quotes?limit=20page=${pageQuotes}`, { headers: { Authorization: props.user.token } })
    setQuotesData({
      hasMore: data.hasMore,
      rows: [...quotesData.rows, ...data.rows],
      totalItems: data.totalItems
    })
    setLoadingQuotes(false)
  }

  // Permet la pagination au scroll
  const observer = useRef()
  const lastQuoteRef = useCallback((node) => {
    if (isLoadingQuotes) return
    if (observer.current) observer.current.disconnect()
    observer.current = new window.IntersectionObserver((entries) => {
      if (entries[0].isIntersecting && quotesData.hasMore) {
        setPageQuotes(pageQuotes + 1)
      }
    }, { threshold: 1 })
    if (node) observer.current.observe(node)
  }, [isLoadingQuotes, quotesData.hasMore])

  const handleValidationQuote = async (id, isValid) => {
    try {
      await api.put(`/admin/quotes/${id}`, { isValid }, { headers: { Authorization: props.user.token } })
      window.location.reload(true)
    } catch {}
  }

  return (
    <>
      <HeadTag title='Admin - FunctionProject' description="Page d'administration de FunctionProject. Gérer les citations." />

      <div className='container-fluid'>
        <div className='row justify-content-center'>
          <div className='col-24 text-center'>
            <h2>Liste des citations (non validées) : </h2>
            <p style={{ marginTop: '5px' }}>Total de {quotesData.totalItems} citations.</p>
          </div>
        </div>

        <div className='row' style={{ marginBottom: '30px' }}>
          <div className='col-24 table-column'>
            <table className='table'>
              <thead>
                <tr>
                  <th className='table-row' scope='col'>Citation/Proverbe</th>
                  <th className='table-row' scope='col'>Auteur</th>
                  <th className='table-row' scope='col'>Proposée par</th>
                  <th className='table-row' scope='col'>Valider</th>
                  <th className='table-row' scope='col'>Supprimer</th>
                </tr>
              </thead>
              <tbody>
                {quotesData.rows.map((currentQuote, index) => {
                  const quoteJSX = (
                    <>
                      <td className='table-row text-center'>{currentQuote.quote}</td>
                      <td className='table-row text-center'>{currentQuote.author}</td>
                      <td className='table-row text-center'>
                        <Link href='/users/[name]' as={`/users/${currentQuote.user.name}`}>
                          <a>{currentQuote.user.name}</a>
                        </Link>
                      </td>
                      <td onClick={() => handleValidationQuote(currentQuote.id, true)} className='table-row text-center' style={{ cursor: 'pointer' }}>
                        <FontAwesomeIcon icon={faCheck} style={{ width: '1.5rem' }} />
                      </td>
                      <td onClick={() => handleValidationQuote(currentQuote.id, false)} className='table-row text-center' style={{ cursor: 'pointer' }}>
                        <FontAwesomeIcon icon={faTrash} style={{ width: '1.5rem' }} />
                      </td>
                    </>
                  )
                  // Si c'est le dernier élément
                  if (quotesData.rows.length === index + 1) {
                    return <tr key={index} ref={lastQuoteRef}>{quoteJSX}</tr>
                  }
                  return <tr key={index}>{quoteJSX}</tr>
                })}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </>
  )
}

export async function getServerSideProps (context) {
  const cookies = new Cookies(context.req.headers.cookie)
  const user = { ...cookies.get('user') }
  if (!user.isAdmin) {
    return redirect(context, '/404')
  }
  return {
    props: { user }
  }
}

export default manageQuotes