/*
 * USAGE:
 * fetchComments()
 */
var copyToClipboard = str => {
  const el = document.createElement('textarea')
  el.value = str
  document.body.appendChild(el)
  el.select()
  document.execCommand('copy')
  document.body.removeChild(el)
}

var copyResults = (str, len) => {
  if (str) {
    window.localStorage.setItem('tw-scrapper-results', str)
    const $el = `<div style="background-color: black; color: white; position: fixed; width: 100%; left: 0; bottom: 0; z-index: 10000; text-align: center; padding: 1em;" id="tw-scrapper-container">${len} comentários extraídos <button onClick="copyResults()">Copiar</button></div>`
    const node = new DOMParser().parseFromString($el, 'text/html').body.childNodes[0]
    document.body.appendChild(node)
  } else {
    const results = window.localStorage.getItem('tw-scrapper-results')
    copyToClipboard(results)
    alert('Comentários copiados')
    document.querySelector('#tw-scrapper-container').parentElement.removeChild(document.querySelector('#tw-scrapper-container'))
  }
}
function fetchComments(length) {

  let baseSelector = window.document

  const prepareCSV = (data, header) => {
    data.unshift(header)
    const dataCSV = data.map(c => {
      return c.map(v => {
        return v
        ? v
          .replace(/[\n\s]+/g, ' ')
          .replace(/^\s+/, '')
          .replace(/\s+$/, '')
        : ''
      }).join('\t')
    }).join('\n')
    return dataCSV
  }

  const scrapComments = () => {
    console.log('Raspando comentários...')
    const $comments = Array.from(baseSelector.querySelectorAll('.stream-items .tweet'))
    const header = ['timeString', 'name', 'username', 'text', 'likes', 'replies', 'retweets']
    const comments = $comments.map((el) => {
      const name = el.querySelector('.fullname').innerText
      const username = el.querySelector('.username b').innerText
      const timeEl = el.querySelector('.tweet-timestamp')
      const timeString = timeEl.getAttribute('data-original-title') || timeEl.getAttribute('title')
      const timeObj = new Date(parseInt(el.querySelector('.tweet-timestamp span').getAttribute('data-time-ms'), 10))
      const text = el.querySelector('.tweet-text').innerText
      const likes = el.querySelector('.ProfileTweet-action--favorite .ProfileTweet-actionCountForPresentation').innerText || '0'
      const replies = el.querySelector('.ProfileTweet-action--reply .ProfileTweet-actionCountForPresentation').innerText || '0'
      const retweets = el.querySelector('.ProfileTweet-action--retweet .ProfileTweet-actionCountForPresentation').innerText || '0'
      return [ timeString, name, username, text, likes, replies, retweets ]
    })
    const csvComments = prepareCSV(comments, header)
    if (comments.length) {
      copyToClipboard(csvComments)
      copyResults(csvComments, comments.length)
    } else {
      alert('Nenhum comentário encontrado')
    }
  }

  const expandComments = () => {
  }

  // Initialize
  return scrapComments()
  /* if (length) {
    return expandComments()
      .then(scrapComments)
  } else {
    return scrapComments()
  } */

}