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/*

Export Memrise course words to CSV.

1. Log into memrise.com
2. Navigate to course home page (e.g. http://www.memrise.com/course/335725/comprehensive-german-duolingo-vocabulary/)
3. Open Developer Console
4. Paste below script and hit enter
5. After all urls have been fetched, copy final word list into spreadsheet.

*/

(() => {

  function getWords(courseId, level) {
    const url = `http://www.memrise.com/ajax/session/?course_id=${courseId}&level_index=${level}&session_slug=preview`
    console.log('Fetching words from ' + url)
    return fetch(url, { credentials: 'same-origin' })
      // parse response
      .then(res => {
        return res.status === 200
          ? res.json()
            // map results
            .then(data => {
              return Object.keys(data.things).map(key => ({
                original: data.things[key].columns[1].val,
                translation: data.things[key].columns[2].val
              }))
            })
            .then(words => {
              return getWords(courseId, level + 1)
                .then(words.concat.bind(words))
            })
          : []
    })
    .catch(err => {
      console.error(err)
      return []
    })
  }

  // fetch
  const start = 1
  const courseId = location.href.slice(30).match(/\d+/)[0] 
  getWords(courseId, start)
    // format as csv
    .then(words => {
      console.log(words.length + ' words')
      return words.map(word => word.translation + '\t' + word.original + '\n').join('')
    })
    // print
    .then(console.log)

})()