import { useState, useEffect, useContext, useRef, useCallback } from 'react'
import Link from 'next/link'
import { UserContext } from '../../contexts/UserContext'
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
import { faTwitter } from '@fortawesome/free-brands-svg-icons'
import redirect from '../../utils/redirect'
import htmlParser from 'html-react-parser'
import Loader from '../../components/Loader'
import FunctionPage from '../../components/FunctionPage/FunctionPage'
import FunctionTabs from '../../components/FunctionPage/FunctionTabs'
import FunctionArticle from '../../components/FunctionPage/FunctionArticle'
import FunctionComments from '../../components/FunctionPage/FunctionComments/FunctionComments'
import api from '../../utils/api'
import copyToClipboard from '../../utils/copyToClipboard'
import 'notyf/notyf.min.css'
import '../../public/css/pages/FunctionComponent.css'

const GenerateQuote = () => {
  const [quote, setQuote] = useState({ quote: '', author: '' })

  useEffect(() => {
    getRandomQuote()
  }, [])

  const getRandomQuote = async () => {
    const { data } = await api.post('/functions/randomQuote')
    setQuote(data)
  }

  const handleCopyQuote = () => {
    let Notyf
    if (typeof window !== 'undefined') {
      Notyf = require('notyf')
    }
    const notyf = new Notyf.Notyf({
      duration: 5000
    })
    copyToClipboard(`"${quote?.quote}" - ${quote?.author}`)
    notyf.success('Citation copiée dans le presse-papier!')
  }

  return (
    <div className='container-fluid'>
      <div className='row justify-content-center'>
        <div className='col-24 text-center'>
          <button onClick={getRandomQuote} className='btn btn-dark'>Générer une nouvelle citation</button>
          <button style={{ marginLeft: '15px' }} onClick={handleCopyQuote} className='btn btn-dark'>Copier la citation</button>
        </div>
      </div>
      <div style={{ marginTop: '20px' }} className='row justify-content-center'>
        <div className='col-24 text-center'>
          <p>" {quote?.quote} "</p>
          <p>- {quote?.author}</p>
        </div>
      </div>
      <div style={{ marginBottom: '20px' }} className='row justify-content-center'>
        <a
          target='_blank'
          rel='noopener noreferrer'
          href={`https://twitter.com/intent/tweet?text="${quote?.quote}" - ${quote?.author}&via=Divlo_FR&hashtags=citation,FunctionProject&url=https://function.divlo.fr/functions/randomQuote`}
          className='btn btn-lg btn-primary'
        >
          <FontAwesomeIcon icon={faTwitter} style={{ width: '1em' }} /> Twitter
        </a>
      </div>
    </div>
  )
}

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

  // Récupère les citations initiales
  useEffect(() => {
    getQuotesData().then((data) => setQuotesData(data))
  }, [])

  const getQuotesData = async () => {
    setLoadingQuotes(true)
    const { data } = await api.get(`/quotes?page=${pageQuotes}&limit=20`)
    setLoadingQuotes(false)
    return data
  }

  // 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) {
        pageQuotes += 1
        getQuotesData().then((data) => {
          setQuotesData((oldData) => {
            return {
              hasMore: data.hasMore,
              rows: [...oldData.rows, ...data.rows],
              totalItems: data.totalItems
            }
          })
        })
      }
    }, { threshold: 1 })
    if (node) observer.current.observe(node)
  }, [isLoadingQuotes, quotesData.hasMore])

  return (
    <div className='container-fluid'>
      <div className='row justify-content-center'>
        <div className='col-24 text-center'>
          <h2 style={{ margin: 0 }}>Liste des citations : </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>
            <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>
              </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>
                  </>
                )
                // 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>
  )
}

const SuggestQuote = () => {
  const { isAuth, user } = useContext(UserContext)
  const [inputState, setInputState] = useState({ quote: '', author: '' })
  const [message, setMessage] = useState('')
  const [isLoading, setIsLoading] = useState(false)

  const handleChange = (event) => {
    const inputStateNew = { ...inputState }
    inputStateNew[event.target.name] = event.target.value
    setInputState(inputStateNew)
  }

  const handleSubmit = (event) => {
    setIsLoading(true)
    event.preventDefault()
    const token = user.token
    if (isAuth && token != null) {
      api.post('/quotes', inputState, { headers: { Authorization: token } })
        .then(({ data }) => {
          setInputState({ quote: '', author: '' })
          setMessage(`<p class="form-success"><b>Succès:</b> ${data.message}</p>`)
          setIsLoading(false)
        })
        .catch((error) => {
          setMessage(`<p class="form-error"><b>Erreur:</b> ${error.response.data.message}</p>`)
          setIsLoading(false)
        })
    }
  }

  if (!isAuth) {
    return (
      <p className='text-center'>
                Vous devez être <Link href='/users/login'><a>connecté</a></Link> pour proposer une citation.
      </p>
    )
  }

  return (
    <div className='container-fluid'>
      <div className='row justify-content-center'>
        <div className='col-24 text-center'>
          <h2 style={{ margin: 0 }}>Proposer une citation : </h2>
          <p style={{ marginTop: '5px' }}>Vous pouvez proposer des citations, et une fois validé elles seront rajoutés à la liste des citations.</p>
        </div>
      </div>
      <div style={{ marginBottom: '40px' }} className='row'>
        <div className='col-24'>
          <form onSubmit={handleSubmit}>
            <div className='form-group'>
              <label htmlFor='quote' className='form-label'>Citation :</label>
              <textarea value={inputState.quote} onChange={handleChange} style={{ height: 'auto' }} id='quote' name='quote' type='text' className='form-control' rows='4' placeholder='La citation...' />
            </div>

            <div className='form-group'>
              <label htmlFor='author' className='form-label'>Auteur :</label>
              <input value={inputState.author} onChange={handleChange} name='author' id='author' type='text' className='form-control' placeholder="L'auteur de la citation..." />
            </div>

            <div className='form-group text-center'>
              <button type='submit' className='btn btn-dark'>Envoyer</button>
            </div>
          </form>
        </div>
      </div>
      <div className='form-result text-center'>
        {
          (isLoading)
            ? <Loader />
            : htmlParser(message)
        }
      </div>
    </div>
  )
}

const FunctionTabManager = (props) => {
  return (
    <FunctionTabs setSlideIndex={props.setSlideIndex} slideIndex={props.slideIndex}>
      <div className='FunctionComponent__slide'>
        <GenerateQuote />
      </div>
      <div className='FunctionComponent__slide'>
        <QuoteList />
      </div>
      <div className='FunctionComponent__slide'>
        <SuggestQuote />
      </div>
      <div className='FunctionComponent__slide'>
        <FunctionArticle article={props.article} />
      </div>
      <div className='FunctionComponent__slide'>
        <FunctionComments functionId={props.id} />
      </div>
    </FunctionTabs>
  )
}

const randomQuote = (props) => (
  <FunctionPage
    FunctionTabManager={FunctionTabManager}
    {...props}
    tabNames={['⚙️ Utilisation', '📜 Liste', '✒️ Proposer', '📝 Article', '📬 Commentaires']}
  />
)

export async function getServerSideProps (context) {
  return api.get('/functions/randomQuote')
    .then((response) => ({ props: response.data }))
    .catch(() => redirect(context, '/404'))
}

export default randomQuote