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'

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
